Colligative Properties

Name: JOANNA CELESTE M. QUINTANA Date performed: NOV. 12, 2012 Section: C-1L Date submitted: NOV. 21, 2012 Group Number: 3 Exercise No. 2 COLLIGATIVE PROPERTIES (Full Report) I. INTRODUCTION Colligative properties In liquid solutions, particles are close together and the solute molecules or ions disrupt intermolecular forces between the solvent molecules, causing changes in those properties of the solvent that depend in intermolecular attraction. For example, the freezing point of a solution is lower than that of the of the pure solvent and the boiling point is higher.Colligative properties of solution are those that depend on the concentration of solute particles in the solution, regardless of what kinds of particles are present the greater the concentration of any solute, the lower the freezing point and the higher the boiling point of a solution. FREEZING POINT LOWERING A liquid begins to freeze when temperature is lowered to the substance’s freezing point and the first few molecules cluster together into a crystal lattice to form a tiny quantity of solid.As long as both solid and liquid phases are present at the freezing point, the rate of crystallization equals the rate of melting and there is a dynamic equilibrium. When a solution freezes, a few molecules of solvent cluster together to form pure solid solvent and a dynamic equilibrium is set up between the solution and the solid solvent. In the case of a solution, the molecules in the liquid in contact with the solid solvent are not all solvent molecule.The rate at which molecules move from solution to solid is therefore smaller that in the pure liquid to achieve dynamic equilibrium there must be a corresponding smaller rate of escape of molecules from solid crystal lattice. This slower rate occurs at a lower temperature and so the freezing point of the solution is lower than that of liquid solvent. The change in freezing point ? Tf is proportional to the concentration of the solute in the same way as the boiling point elevation. ?Tf = Kf ? msolute ? ?soluteHere also, the proportionality constant Kf depends on the solvent and not the kind of solute and isolute represents the number of particles per formula unti of solute. For water, the freezing point constant is -1. 86 oC-kg/mole. Freezing point or melting point is the temperature of transition between solid and liquid. Melting point can be measured more accurately than freezing points. This is becauses so in freezing point measurements, supercooling may occur which would yield a lower than sslkdjs freezing (melting point).CHANGES IN VAPOUR PRESSURE: RAOULT’S LAW At the surface of an aqueous solution, there are molecules of water as well as ions or molecules from the solute. Water molecules can leave the liquid and enter the gas phase, exerting a vapour pressure. However, there are not as many water molecules at the surface as in pure water, because some of them have been displaced by dissolved ions or molecules/ ther efore, not as many water molecules are available to leave the liquid surface, and the vapour pressure is lower than that of pure water at a given temperature.From this analysis, it should make senses that the vapour pressure of the solovent above the solution, Psolvent, solution, that is , to their mole fraction. Thus, since Psolvent ? Xsolvent, we can write Psolvent = Xsolvent ? K (where K is a constant). This equation tells you that, if there are only half as many solvent molecules present at the surface of a solution as at the surface of the pure liquid, then the vapour pressure of the solvent above the solution will only be half as great as that of the pure solvent at the same temperature. If we are dealing only with pure solvent, the above equation becomes Posolvent = Xsolvent ?K where Posolvent is the vapour pressure of the pure solvent and Xsolvent is equal to 1. This means that Posolvent = K; that is, the constant K is just the vapour pressure of the pure sovent. Substitutin g for K in the foremost equation, we arrive at an equation called Raoult’s law: Psolvent = Xsolvent ? Posolvent If the solution contains more than one volatile component, then Raoult’s law can be written for any one such component, A, as PA = XA ? PoA Like this ideal gas law, Raoult’s law is a description of a simplified model of a solution.An ideal solution is one that obey Raoult’s law/ although most solution are not ideal, just as most gases are not ideal, we use Raoult’s law as good approximation to solution behaviour. In any solution, the mole fraction of the solvent will always be less than 1, so the vapour pressure of the solvent over an ideal solution (Psolvent) must be less than the vapour pressure of the pure solvent (Posolvent). This vapour pressure lowering, ? Psolvent, is given by ? Psolvent = Psolvent ? Posolventwhere Psolvent < Posolvent Boiling point elevationRaoult’s law tells us that the vapour pressure of the solvent over a solution must be lower than that of the pure solvent. Assume for example that you have a solution of a non-volatile solute in the volatile solvent benzene ? ? ? ? II. MATERIALS A. Reagents 4. 00 g naphthalene 0. 20 g unknown solute A unknown solute B (assigned amount per group) distilled water B. Apparatus 250-mL beaker 400-mL beaker 100-mL graduated cylinder test tubes thermometer iron stand, iron ring, iron clamp hot plate C. Other Apparatus wire gauze tissue paper graphing paper timer III. PROCEDURE Freezing Point of NaphthaleneIn a clean and dry test tube, 2. 0 g of naphthalene was weighed. To measure the temperature while heating, a thermometer was suspended by tissue paper at the mouth of the test tube. It was placed in a water bath with the water level above the sample in the test tube. To avoid the contact of the test tube to the bottom of the bath, it was supported by an iron clamp. The water bath was then heated until the entire sample has melted and until the temperatur e of the sample reached 90o C. The flame was put off and the temperature reading was recorded every 15 seconds until the temperature has fallen to 70oC.The set up was put aside for the next part of the experiment. Data gathered were tabulated and plotted for analysis and evaluation. Freezing Point Depression of Naphthalene Pre weighed 0. 20 g of unknown solute A was added to the previous set up of naphthalene. The same procedure was done with it. The thermometer was again suspended at the mouth of the test tube by tissue paper. With the help of iron clamp, it was again placed in a water bath, with the water level above the sample in the test tube, to avoid contact to the bottom of the bath.The water bath was then heated until the entire sample of unknown solute A and naphthalene has melted. When the temperature reached 90oC, the flame was put off. The temperature reading was recorded every 15 seconds until the temperature has fallen to 70oC. Data was also tabulated and plotted toget her with the data from freezing point of naphthalene. Boiling Point of Water In a 250-mL beaker, 100-mL of distilled water was boiled until it completely boiled. The temperature reading was recorded. In a separate 250-mL beaker, 0. 20 g of unknown solute B was dissolved in 100-mL distilled water.This was also heated until it finally boiled. The boiling point was also recorded. It was tabulated together with the boiling points of solutions with varying amounts of solute from other groups. Comparison was made for evaluation of the results. IV. DATA/OBSERVATIONS Table 1. 1. Observations on cooling of naphthalene at 15-second intervals. Time (sec. )Temperature (oC)Appearance 1590clear liquid 3090clear liquid 4587clear liquid 6086clear liquid 7585clear liquid 9085clear liquid 10584clear liquid 12084clear liquid 13583clear liquid 15083clear liquid 16582clear liquid 18081clear liquid 9581clear liquid 21080clear liquid 22580clear liquid 24079clear liquid 25579clear liquid 27078clear liquid 28577clear liquid 30077clear liquid 31576solidification 33075solidification 34575 36075 37575 39075 40575 42075 43575 45075 46575 48075 49575 51075 52575 54075 55575 57075 58575 60075 61575 63075 64574 66074 67574 69074 70574 72073 73573 75073 76572 78072 79571 81070 Mass of naphthalene used (g): 2. 00 g Table 1. 2. Observations on cooling of solution of naphthalene and unknown solute at 15-second interval. Time (sec. )Temperature (oC)Appearance 1590clear liquid 3090clear liquid 587clear liquid 6086clear liquid 7585clear liquid 9085clear liquid 10584clear liquid 12084clear liquid 13583clear liquid 15083clear liquid 16582clear liquid 18081clear liquid 19581clear liquid 21080clear liquid 22580clear liquid 24079clear liquid 25579clear liquid 27078clear liquid 28577clear liquid 30077clear liquid 31576clear liquid 33075 34575 36075 37575 39075 40575 42075 43575 45075 46575 48075 49575 51075 52575 Mass of naphthalene used (g): 2. 00 g mass of unknown solute B (g): 0. 20 g Table 1. 3. Data on freezing point depression of naphthalene. Mass of naphthalene used (g)2. 0 g Mass of unknown solute A used (g)0. 20 g Mass of solution (g)2. 20 g Freezing point of pure naphthalene (oC)75 oC Freezing point of solution (oC)73 oC Freezing point difference of pure naphthalene and of solution (oC) Molality of solution (mol/kg) Moles of solute used (mole) Molecular mass of solute (g/mole) Table 1. 4. Summary of data on boiling points of solutions with varying amounts of solute. Group No. Amount of solute B used (g)Boiling point (oC) –100 10. 5099. 0 21. 0090. 0 31. 5099. 5 42. 0099. 5 52. 50100 V. DISCUSSION ? ? ? ? VI. CONCLUSION ? VII. LITERATURE CITED/BIBLIOGRAPHY

Do You Agree With This Portrayal Of The Reasons Why The Troubles Continued Into The 1990’s?

Do You Agree With This Portrayal Of The Reasons Why The Troubles Continued Into The 1990's? Explain Your Answer Using The Source And Your own Knowledge. The cartoon in source J drawn in 1991 is an accurate depiction of the reasons and troubles in Northern Ireland in the early 1990's. Each of the characters in the picture represents a factor that helped continue the problems in Northern Ireland. The staircase continues in a vicious circle because all the factors are linked. However, the cartoon does not apply to the end of the 1990's because the factors were beginning to be sorted out and the Good Friday Agreement was signed. One of the main reasons for the trouble in Northern Ireland was that the politicians weren't working together or listening to each other's points and views. In the cartoon, the man holding ballot papers and wearing a large badge represents a politician of either a republican or unionist organization. The unionists wanted to stay part of Great Britain and British Rule. The leader of the Democratic Unionist Party (DUP) Reverend Ian Paisley had a strong influence in the 1960's 70's and 80's that caused violence. The republicans wanted a split from Great Britain and become part of the republic of Ireland. Gerry Adams, the president of Sinn Fein and Pat Doherty, vice President both were strong advocates of this. Gerry Adams was involved with the Irish Republican Army in the seventies, along with Martin McGuinness. The unionists and republicans didn't want to work together even in the early and mid-90's. In February 1995, the British and Irish Governments drew up the Joint Framework Document. This included a new assembly for Northern Ireland and North-south Council of Ministers, which have a say over a whole range of issues. 1995 saw Northern Irelands lowest death toll since the troubles began, but there were still problems. Unionists were sceptical about the plan for a North-South Council of ministers because they though there was a possible chance it would lead to a united Ireland. Then the IRS and Sinn Fein did not want to decommission their weapons because they did not trust the British Government. David Trimble, the new Ulster Unionist Party leader, gave his total support to the peace process and US Senator George Mitchell worked to achieve a settlement that everyone would agree to. By the late 1990's most politicians were working together for peace and they signed the Good Friday Agreement in 1998. In the cartoon there is a man holding a gun and walking in the opposite direction to the others on the staircase. He represents the terrorism and during the early 1990's paramilitary groups such as the Irish Republican Army (IRA), the Ulster Volunteer Force (UVF) and the Ulster Defence Association (UDA), caused a great deal of destruction in Northern Ireland. The IRA is a mainly Catholic organization who wanted to push the British Army out of Northern Ireland and for Northern Ireland to join the Republic. Gerry Adams (Sinn Fein) had a leading role in the organization of Bloody Friday, along with Seamus Twomey and Ivor Bell (senior Provisionals), which took place July 21st 1972. The IRA planted and exploded 22 bombs, which, in the space of 75 minutes, killed 9 people and seriously injured approximately 130 others. Then on the 31st July 1972 the Claudy Bombing, also known as Bloody Monday, nine people were killed, (2 under 16 and four over 60). Although the IRA was suspected of planting the bombs, no proof was found or confession made. Martin McGuinness, a senior figure of the IRA and the ‘number two' at the time of Bloody Sunday Massacre on 30th January 1972 where thirteen were killed and thirteen more were shot and injured on a civil right march. While McGuinness was in power, 17 British Army soldiers, 11 civilians, 9 from the Claudy Bombing, 4 UDR members and 2 Royal Ulster Constabulary officers were all killed. Martin McGuinness has since become Sinn Fein's chief negotiator. The Protestant Paramilitary groups wanted to get rid of the IRA and protect the Protestant communities. In 1966, a group of Shankill Road loyalists began to use the UVF name. UVF members and members of Ian Paisley's Ulster Protestant Volunteers (UPU) carried out a series of explosions at public utilities and tried to blame them on the then nearly non-existent IRA. In 1972 Billy Hutchinson and two others brutally stabbed to death Social Democratic and Labour Party politician, Paddy Wilson. In this horrific attack Mr Wilson's girlfriend Irene McDonald had her breasts cut off. It appears that the attackers were particularly angry because Irene McDonald was a Protestant. Police believe that the Northern Ireland Paramilitary groups were responsible for 22 deaths, 251 shootings and 78 bombing all in 1997. Although this seems like a lot of violence, it was nowhere near as much as past performances and had become less active. 1994 saw ceasefires from the paramilitaries, but the IRA and Sinn Fein didn't agree to it. By the late 1990's Paramilitaries had stopped most of their violent activities due to the initiative of the Good Friday agreement. The man with a pipe in his mouth and the woman holding a small child may represent the social and economic situation and problems that were faced by many of the low working classes of both Protestant and Catholic backgrounds in Northern Ireland. Unemployment was a big issue in Northern Ireland where a higher rate of unemployment amongst members of the Catholic community than the Protestant community has always been the case. In 1976, the first Fair Employment Act in Northern Ireland established a Fair Employment Agency in an attempt to prevent religious and political discrimination in Northern Ireland. The 1989 Fair Employment Act brought about the establishment of the Fair Employment Commission, which exists today to keep an eye on employment practices, and a Fair Employment Tribunal to hear complaints. In 1981 47% of Catholics in Northern Ireland were unemployed to the 22% of Protestantwho were unemployed. But by 1997 Catholics had 40% of the jobs available in Northern Ireland. Housing was an even bigger issue. Overcrowding was a huge problem in 1960's. For a house to be overcrowded if there was more than two people live there per room excluding the bathroom and kitchen. In the area of South Ward in Londonderry, a predominantly Catholic area, there was over 6 000 people living overcrowded accommodation. In the early 1970's, much of the housing provision in Northern Ireland was inadequate. In 1971, only 63% of Catholic homes in Northern Ireland had hot water, a fixed bath or shower, and an inside toilet, as opposed to 72% of Protestant homes. This gap has however been narrowed over the past 25 years, with almost all homes in Northern Ireland (98%), both Catholic and Protestant being furnished with these facilities and since 1971, the Government has invested over à ¯Ã‚ ¿Ã‚ ½9 000 million in public housing in Northern Ireland. By the late 1990's the economic situation had dramatically improved with grants, money from America and peace. On the walls of the staircase, two years are mentioned that represent both Catholic and Protestant successes. These past events have helped people remember their differences and this has led to violence. 1690 was the battle of Boyne. This was when William of Orange (Protestant) defeated the Catholic King of England, James the second. This came after James had been overthrown and his daughter Mary and her husband William of Orange were asked to rule. James fled immediately to France where he found support from the French King. Louis the fourteenth gave him troops and ship to help him retain his title. James set sail for Ireland where he would gather support from the Catholics. All went well for James and soon Ulster was in desperate need of help from William. James attacked Londonderry and the siege lasted long enough for William to form an army and bring them to Ireland. Then in July of 1960 William killed James but it wasn't until the next year that the Jacobite forces (James supporters) were defeated. This is a very important event for the Protestants and every July they march through Dumcree to commemorate the event. The second date on the staircase is 1916 and in this year bought the battle of Somme, where the 36th Ulster division sent men across the cannel and began to disembark in France. They fought with other troops and there bravery was awarded with medals in 1918. This is also very important to the protestant today and they remember it accordingly. In the same year, on 17th April the Irish Citizen Army, together with the Irish Volunteers, rose up in arms against the might of the British Empire to strike a blow for Irish freedom and for the setting up of an Irish Republic. James Connolly, the General Secretary of the Irish Transport and General Workers Union and founder of the Irish Socialist Revolutionary Party, was one of the main leaders in the struggle for national freedom. 1000 volunteers and workers' troops stayed put in the centre of Dublin in battle with the British army. After a week of fighting which destroyed the city centre, the volunteers were forced to surrender British troops succeeded although suffering great loses. Connolly was arrested and Arthur Henderson, the secretary of the Labour Party signed for hi death, which took place on 12th May. Catholics remember this as one of the first steps to their independence. However, unlike other causes of violence the remembrance of these events in the forms of the marching seasons of both Catholics and Protestants bought tension that led to violence and still saw problems in the late 1990's. The man holing a bible is either a priest or minister and represents the problems religion caused in Northern Ireland. Ever since the sixteenth century when Henry VIII started to meddle in the way that Ireland was ruled and changing the Church of England there have been problems but it wasn't until James II started plantations to balance the Catholic majority in Ireland so they couldn't attack England. The Protestants pushed in and took the Catholics land and money and violence really started. The segregation of Catholics and Protestants meant that living arrangements, education and employment were affected. People of different religions were forced to live in separate areas and a person of a different religion found in the others area was often attacked. Children were also forced to attended segregated schools. They were taught that the other religion was bad and as they grew older that found problems created by prejudice. Some people had hardly any contact with another religion because catholic companies employed Catholics and Protestant companies employed Protestants. This caused many problems because when contact was made it would not be good because neither had been educated about the other and new nothing of each other. Many religious leaders have worked hard to find peace in the late 1990's. Reverend Ian Paisley (Protestant leader in Northern Ireland), was ordained in the Reformed Presbyterian Church in 1946, co founded a new sect, the Free Presbyterian Church of Ulster in 1951, which soon grew to over 30 churches. He fought and protested for many years. Although religion still divides many areas in Northern Ireland religious leaders are fully behind the Good Friday Agreement. The cartoon drawn in 1991 shows an accurate portrayal of the reasons for the troubles in Northern Ireland up until the early 1990's. However in the late 1990's the troubles were beginning to be resolved and the Good Friday Agreement had a strong impact. The agreement saw better housing, more employment, education and political opportunities, the end to the majority of the violence and politicians working together. The Good Friday Agreement has not eliminated all the problems as there is still violence going on today, for example, the Northern Irish police found explosives that had been dumped that were linked to the IRA.

Colors in the Caves Narrative Essay

It was Spring Break of 2010, the already steamy, hot temperatures of the Southern air rising despite the full blast of the air conditioning blowing through my hair as we drive through the seemingly never-ending desert of Arizona. My family, consisting of four, is headed toward Picacho Peak to take on the strenuous 6. 2-mile hike along the Sunset Vista Trail. We pull up to the Sunset Vista Trail Head parking area, our medium-sized Camelbaks having already been packed somewhere along the 1,060 miles of flat, boring road, we start up the trail with the sun beating down our backs.Automatically, I fall in step with my long-legged brother while my sister gratefully stays behind with our mother, adopting a preferred slow, steady pace. The sun is bright, the jagged rocks and occasional stream receiving its pale, yet blinding reflection. My brother and I make a good team; he supplies the food while I supply the water, all the while sharing laughs and memories, memories that I will later on th ink to be my last.After a couple hours, the scalding sun is taking on its inevitable journey toward the western horizon, being replaced with the cool breeze of the moon. My brother and I decide to take a refueling break on two enormous rocks after four hours of walking in the moonlight. â€Å"Here, take my Camelbak,† I say, â€Å"I’m going to the bathroom. † I take my flashlight as I walk off the trail for two minutes, keeping track of the monotonous rocks and brush I pass by. When I am finished, I start to head back towards our temporary resting place.Passing the familiar rocks, I crouch down to inspect with my LED flashlight a peculiar zigzag shape on the ground. Tracing my finger along the sharp edges of the shape, I realize it’s a narrow fracture in the ground, leading to a larger web of intricate fractures that rest just under my feet. Just then I hear a whisper of rushing water. Before I have time to react to the sudden realization that the ground c ould collapse from under my feet, I fall through the Earth. The fall seems endless though it may have taken no more than two seconds.I land with an echoing crash as my body penetrates through hot water. My body is violently thrown to the side with the sharp current and I am struggling to reach the surface. I reach out, my hands sliding on the slick floor as my body is carried by the flow of the hot spring. My wrist catches on a column jutting up on the floor of the cave. I wrap both arms around it to haul myself up. I cough to catch my breath, throat burning. The flashlight is still on. I wave the blue light around the darkness.The blue light winks as I shine it on my surroundings, the battery will die soon. I spot a tunnel not far off to the right. It must go somewhere, I thought. I can see a clear enough path towards it, so I reluctantly click off the safety of the blue light. I am instantly swallowed by darkness as I crawl my way towards the tunnel. Black, black, black is all I s ee. Without my vision, I have to be careful of where I move. The blue luminosity from the flashlight leaves me with the hesitant desire to not be wasteful.How many hours has it been? No food, no water. The sun should surely be up soon. Just as the thoughts have formed I see a faint light up ahead. The yellow glimmer of the sun’s rays gives me the hope I so crave. The light is still nowhere near enough to be able to see anything. The overwhelming pitch-blackness, the winking blue of the LED flashlight, and the steady growing yellow shine of the sun is all I see in my slow, crawling trek along the cave’s floor.With my cautious travel, thriftiness, and hopeful thoughts, the growing light is suddenly all around me. I am squinting as I collapse to the ground. Almost immediately I am pulled up from under my shoulders, faint cries of relief and concern swarm through my ears, but with the overbearing silence and lack of energy, I cannot make out the words. All I see is brightn ess, as the hope I so desperately clung to is turned into overwhelming relief and happiness as survival is achieved. That’s when I black out.More brightness, a different kind of light. Not the hopeful yellow of the sun shining through the rocks, but of a white fluorescent one. I am in a hospital. My family is suddenly all around me, throwing hugs and kisses and joy. A nurse comes in with a doctor, they give my family time to pull themselves together. I can hear the nurse speaking to the doctor, â€Å"How could she possibly have made it through those awful caves? † The doctor responds to her, flashing me a knowing smile, â€Å"Colors go a long way in finding our inner character†.

Living an excellent life Essay Example | Topics and Well Written Essays - 1250 words

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Workplace Law - Assignment Example Both parties have duties and rights under a common law agreement. In the case at hand, the employer first took Jane into service without any written documents. The only contract that existed between Jane and TMMS was based on a verbal discussion between the owner and Jane. However following the reorientation of the business, the owner decided to introduce individual contracts that applied to each employee in a â€Å"take it or leave it† situation. 1Though the intent of the owner seems to have been to outsource the functions of the employees to them but in offering a â€Å"take it or leave it† contractual agreement, the owner has initiated the AWA (Australian Workplace Agreement) laws. Moreover in case that a dispute arises between an employer and an employee in a situation where no written contracts are available, the common law of Australia overrides any derogatory treatment condition already agreed upon. The same principle applies equally well to written contracts and even if employer and employee agree to terms that are derogatory to either party, the resolution of a dispute would be carried out according to Australian common law2. Hence it can be clearly stated that the current situation where Jane and TMMS’s owner Sam were in a contractual relationship, the creation of a dispute would be governed by Australian common law especially if the terms are derogatory to either party. ... e to one session following the assembly, Sam provided his employees with a â€Å"take it or leave it† contract that reduced the flexibility of employees by a significant margin. Being forced into a hard bargain, Jane accepted the contract and began working as usual. Around a month ago, Jane was crushed by a car that rolled over her as she was working on it. The extent of the injuries meant that Jane was effectively unable to work for the next six months and would be unable to continue this career line after recovery. Sensing that Jane was unfit for work anymore, Sam immediately terminated the individual contract. 3. Relevant Common Law Sections The â€Å"take it or leave it† style of agreements between employers and employees came into being following the passage of the WRA (Workplace Relations Act) of 19963. Under this set of laws the employee and the employer could enter into an individual contract that could override state and federal employment laws as long as both parties agreed to it4. Any contracts raised under the AWA only had to meet only the most minimal of all requirements under the Australian Fair Pay and Conditions Standard. The agreements drafted in this manner need not include any dispute resolution procedures but were not allowed to include any prohibited content5. Within the current case too, there are no specific dispute resolution procedures outlined. However the AWAs were highly controversial because they severely impinged worker’s rights and the ability to bargain collectively 6 7. Based on this and opposition from various quarters, the Workplace Relations Act of 1996 was curtailed in its influence with the passage of the Fair Work Act of 2009 8. Under this new act any new kinds of AWAs were banned from being put into place. Within the context of

Changes in the Banking Industry Essay Example | Topics and Well Written Essays - 500 words - 1

Changes in the Banking Industry - Essay Example The capital ratio stands at 11.39% in 2010 when compared to 8% in 2006. The number of institutions reporting to the FDIC has decreased from 8833 institutions in the year 2005 to 7760 institutions in 2010. The number of problem institutions has increased drastically on a year on year basis from 552 in 2009 to 860 in 2010. The number of failed institutions has also increased to 127 institutions in 2010 from just 3 institutions in the year 2007. Bank’s return on assets which refers to net income as a percentage of total assets, increased which suggests that the banking industry is able to garner more interest income with the rising in demand for loans with reducing the cost of funds, therefore sustaining revenues and improving asset quality. In relation to the core capital ratio, Tier 1 capital can absorb losses without a bank being required to cease its functioning. Therefore increase in core capital ratio indicates the health of the banking industry is improving considerably. T he banking industry is giving prime importance to strengthening the Tier 1 level of capital. Credit growth has been strong due to which the net interest margin is indicating an upward trend with a 291.33% increase in net operating income of banks. Despite this relatively good news, the number of problem institutions has increased primarily because of financial, operational or managerial weaknesses that might lead to increased number of failed institutions in the last quarter of 2010. The trend of the number of institutions reporting to FDIC reducing is largely explained by the acquisition of smaller institutions by bigger institutions to prevent banks from failing and also because of increasing number of failed institutions. The number of problem institutions continues to increase but the aggregate assets of these problem institutions continued to decline suggests that this are smaller institutions in nature.  

Budget Finance Paper Research Example | Topics and Well Written Essays - 2250 words

Budget Finance - Research Paper Example The author of the essay "Municipal Budget" makes the deep analysis of New Orleans, Louisiana. New Orleans Louisiana is a relatively small city, although the largest in the state, with a rank of only forty-six in terms of the United States’ most populous cities. It encompasses five districts with one city council person each and two at large councilmen with the current mayor being Mitch Landrieu. The budget then encompasses some 565 pages and is pretty much detailed and informative, with graphs and comparisons to similar sized cities such as Portland, Oregon and Atlanta, Georgia. It tells where revenues come from, what money is spent and where, whether there is going to be a surplus (yes with a 2011 surplus of $500K), and whether there are to be any cuts in city services. The budget also addresses two other difficult areas. One is the situation faced by municipalities all over the country, that of the nationwide recession begun in 2007-08 and continuing today. New Orleans has its share of unemployment woes; at 8.3% it is slightly higher than the national average. With the unemployment comes hundreds of foreclosures and other abandoned buildings. Added to that is the fact the city is still trying to recover from Hurricane Katrina in 2005 which only adds to the blighted structures and a good portion of the city’s budget is devoted to placing liens and demolishing these b uildings. So yes, the current budget does give a very adequate overview of New Orleans’ financial position.... The budget then encompasses some 565 pages and is pretty much detailed and informative, with graphs and comparisons to similar sized cities such as Portland, Oregon and Atlanta, Georgia. It tells where revenues come from, what money is spent and where, whether there is going to be a surplus (yes with a 2011 surplus of $500K), and whether there are to be any cuts in city services. The budget also addresses two other difficult areas. One is the situation faced by municipalities all over the country, that of the nationwide recession begun in 2007-08 and continuing today. New Orleans has its share of unemployment woes; at 8.3% it is slightly higher than the national average. With the unemployment comes hundreds of foreclosures and other abandoned buildings. Added to that is the fact the city is still trying to recover from Hurricane Katrina in 2005 which only adds to the blighted structures and a good portion of the city’s budget is devoted to placing liens and demolishing these b uildings. So yes, the current budget does give a very adequate overview of New Orleans’ financial position. By far and away, the biggest expenditures from New Orleans’ budget are public safety, fire, police, and other emergency services. For the 2012 budget, when taken from the Adopted General Fund Expenditures public safety accounts for over half of that budget, sixty per cent. Even when considered as part of the entire budget (general and non-general, public safety still accounts for thirty five per cent. Of the divisions within that department, the police have the biggest slice, budgeted for 2012 at almost $119 million, an increase of nine per cent over 2011.

Accounting theory and practice Speech or Presentation

Accounting theory and practice - Speech or Presentation Example Q1 (I): since the preference share is short-lived (it is to be redeemed in 2013, thus not a permanent source of capital), it can be classified under temporary equity. The following journal entries should be made in 2010, 2011, 2012 and 2013 (Swart 2002, pp. 140-176). Q1 (II): the preference shares are redeemable and the shareholders have exclusive rights to dividends (2%) of the par value. Therefore, it is treated as a debt and would be recorded as below in the financial statements (Swart 2002, pp. 140-176) In the above process of determining the amortized costs, the cash flow = (2%*25M) except for the year 2013, which contains the principal amount (25M) plus the cash flow (500,000). Second, the cash flows are discounted using the presumed interest rate of 10% to get the opening amount (18,659,900). In the row marked 2010, the opening amount is multiplied by 10% to get the interest payable (1,865,990). The difference between interest payable and cash flow for that year is added to the opening for that year, to get the closing amount (20,025,890). The closing amount for 2010 becomes the opening amount for 2011. Follow the same process up to year 2012. Since the shares are redeemed in the year 2013, there will not be a closing amount for the year. Part B: the general accounting rules require that financial items be treated as liabilities if it obligates a company to part with cash or other financial assets. Secondly, if the issuer (a company), has no control over factors that leads to its maturity date. Lastly, if the requirement to pay principal amount may induce a contractual obligation to pay interest on dividends. However, the internal accounting standard has done major reviews on the mentioned regulations to include other emerging issues. The review of the rules regulating the accounting treatment of liabilities paved way

Darwin Essay Example | Topics and Well Written Essays - 1500 words

Darwin - Essay Example So it could be well said that these two articles is contemplating and criticizing Darwin’s intellectual and scientific quality along with his sense to respect theological values. Darwin intelligently investigated about human evolution and he came to a conclusion that God created few animal species and they by natural selection progressed to become humans. Everyone knows the fact that our closest DNA match agrees with apes. The intelligent level and social existence of apes match with human beings on a great level. But in the journal article by Cosans there is a contradiction on the fact where theology entangls with evolution. In this article Cosans put forward the statements mentioned by eminent anatomist Owen, where he suggests that God has no power in the human evolution theory. Considering the journal by Cosans, it cannot be stated that Darwin only concentrated on evolution as a divine process. He studied the subject visiting many earth zones and found that life originated from microorganisms and it went on to evolve into animals and ultimately in to intellectual beings. Darwin here is not prophesying on facts which he has not researched on. He has investigated on organisms like bacteria to apes to understand human evolution. Now in the journal by Cosans ,we can find that Owen retaliates on the fact that human evolution can be seen from a theological perspective.Owen as an anatomists look at the flaws of Darwin’s scientific research conclusion. Darwin here looked at creations and the mystery hidden behind its life and evolutionary process which has morphed them to become animals and later into human being by natural selection Here in this journal titled† Was Darwin a creationist† a question is raised by Cosans whether Darwin itself is adding divinity with evolutionary process or is evolutionary theory with a theological perspective is a

Judaism, Islam, Christianity Essay Example for Free

Judaism, Islam, Christianity Essay Judaism, Islam, and Christianity are all completely different religions from an outsider’s point of view. Yet, when you look at all three of them in depth, a person can find many of the same characteristics. From their origins to their life rituals, there are many differences and similarities between these three popular religions. Between the origins of Judaism, Islam, and Christianity, there is much overlap. Judaism was started through the Patriarch and Matriarch of the faith, Abraham and Sarah. They bore a child together named Isaac, who Jewish people believe to be their ancestor. Jewish people call themselves Children of Israel, signifying their descent from Jacob. Also, Abraham had another son with a different woman. This son, Ishmael, is believed to be the ancestor of Islam. The origin of Christianity was from Jesus Christ, who they believe rose from the dead and is the Son of God. His followers, otherwise known as disciples, spread the religion after his death in 30 CE throughout the Roman Empire. It soon became the official religion in the empire with Emperor Constantine’s decision. It has so far spread worldwide and is the largest religion in the world with almost 2. 2 billion followers. The sacred writings of Judaism, Christianity, and Islam have many similarities. Christianity and Judaism believe in the Old Testament, which in Judaist terms is the Tanakh. This consists of the Torah, the Neviim, and the Ketuvim. It tells of God making a covenant with people. They believe that Jesus is not the Son of God and that their saviour is still to come. Muslims follow the exact writings of the Qu’ran, which they believe their prophet Mohammed was told in a revelation from Allah. They also follow the Hadith and the Sunna, which are, in a way, different variations of Mohammad’s life and stories. They regard parts of the Old Testament and the Gospels as inspired, and believe the Qur’an to be a more final and complete copy. The places of worship between Judaism, Islam, and Christianity are quite different. People of Jewish faith observe the Sabbath and conduct their services in Synagogue or the Temple, Christians worship in churches, chapels, and cathedrals, and Muslims worship in Mosques. People of Jewish faith and Muslims do not allow statues in their worship places, stating that it takes away their attention from God and Allah and that it ruins their monotheistic belief. Roman Catholics do not worship statues or icons. In the Eastern Catholic churches, people viewed icons as a way to greater worship and they prayed to them for protection. In Judaism and Christianity, the Holy Land, being Israel, is considered a very sacred place due to the fact that Jesus was born there and lived there, and also because that was the land promised to Abraham. Rome is also considered a very sacred place to Christians because that is where the leader of their religion lives, otherwise known as the Pope. This is similar to Medina and Mecca in Islam due to the fact that their house of God, the Kaaba, is located there and is believed to be placed right underneath Heaven. The role of women between Judaism, Islam, and Christianity, although men and women are equal in the eyes of God, are similar. Traditional Judaism gives different roles for men and women. For example, Orthodox men and women worship separately. This is in comparison to Muslims, where the Qur’an treats men and women as equals. This is close to Christianity, where everyone is equal under God. This allows women and men to be equal. For example, both genders can attend worship at the same time in the same place. Unfortunately, women are oppressed in today’s Muslim society due to Sharia law, which they believe is the law of Allah. It often discriminates against women and strips them of their rights. For example, a women’s word does not count as much as a man’s. This is similar to Christianity where women can not become ordained priests and are not given equality within in the Church. Also, men and women worship separately in Islam, which shows similarities to Orthodox Judaism. The symbols of Judaism, Christianity, and Islam are very much different. The Star of David is named after King David, who had a shield with a star on it. It has seven spaces, including the separate points and the centre. This number seven is very important within the Jewish faith due to the six days of creation including the seventh day of rest. The menorah, another sacred Jewish symbol, also represents the seven days of creation. It is referred to as the â€Å"tree of life† because it has seven branches. The Mezuzah is also another sacred object. It contains the Shema written on a parchment. The most sacred ritual object in the Jewish faith is the Torah Scroll. It is the centre of Jewish life because it is used to teach, and it has the Five Books of Moses inscribed in it. In comparison to Judaism, the symbols for Christianity are few. They regard bread as Jesus’ body, which they call the Eucharist. They also believe that wine is Jesus’ blood. They drink and eat these at masses in remembrance of the Last Supper and the sacrifice that Jesus gave to them to wash away their sins. They regard the cross as a symbol of the sacrifice as well. Ichthus, the symbol of a fish, is a symbol for Christianity. In Islam, the Tawhid is the concept of monotheism. It holds God as one and unique. The crescent star is widely used as a symbol on Islamic flags. When babies are born in Judaism, Islam, and Christianity, there are many rituals that they attend to. In Judaism, they believe in having the baby circumcised, which they call a Brit milah. Muslims also believe in having their sons circumcised. In Christianity, they believe in baptising the baby by a Priest to rid it of its original sin. In Islam, they believe in whispering the call to prayer in the baby’s right ear, making sure that it is the first sound they hear. Also, there is a naming ceremony where close friends and family gather to decide on the child’s name. Each of these rituals is different, leading to diversity between religions. During a marriage in Judaism, Islam, and Christianity, one must use different rituals to attend to the needs of their religion. In Judaism, the couple stands under a canopy where the Rabbi reads from the Torah. Also, the marriage becomes official when the partners give something of value to each other, such as rings. In Islam, many marriages are arranged and polygamy is allowed. They see marriages as a way to gain political advantage and to tie one family to another. This is not the case with Christianity. When you marry under God in a church, they do not permit divorces unless the circumstances are dire. You exchange rings as a sign of the vow you have given to the other person. Also, you are a couple under God and are expected to baptise your children. When it comes to death in Judaism, Islam, and Christianity, there are different ways to go about it. In Judaism, a shitting shiva takes place, where the family member mourns for a period of seven days. In Islam, the family member is quickly wrapped and buried. They are then pointed towards Mecca, which holds the sacred Kaaba. They also believe that the last words on your lips should be the Shahada. In Christianity, they hold a mass where families and friends can go to mourn as one. If lucky, you are blessed by a Priest, which relieves you of your sins. This is called Anointing of the Sins and Last Rites. The beliefs of Judaism, Islam, and Christianity are quite similar. They each have a different take on past events. Christians, Muslims, and Jewish people believe in monotheism, stating that there is only one divine God. Muslims and Jewish people claim that Christians do not believe in one God, seeing as they think God exists in three different ways; the Father, the Son, and the Holy Spirit. Christians call this the Trinity. In Judaism, they do not believe that Jesus rose from the dead, is the Son of God, or was born from the Virgin Mary. In Christianity, they believe in all of those points. In Islam, they believe that while Jesus was the Son of God and was born from the Virgin Mary, He did not die on the cross but was rather brought into heaven by God. People of Jewish faith think that Jesus was crucified due to this claim of being divine. Choosing to disregard the claim that Jesus is the saviour, they believe that their saviour will come one day and will unite the world and bring peace to humanity. Muslims believe that the Kaaba, a sacred cube located in Mecca, is God’s house and is located directly underneath heaven. They trust that the point to life is to live in a way that pleases Allah to gain a spot in Paradise, which is their heaven in the afterlife. The meaning of life for Christians, though, is to seek divine salvation through the grace of God and to become one with Him. People of Jewish faith believe life should be spent helping humanity and fellow neighbours. Christianity believes that every human has inherited â€Å"original sin† from Adam, meaning that people have a tendency towards evil. This is in comparison to Judaism and Islam who believe people are capable of both good and evil actions. In comparison to Christianity and Judaism, prayer rituals are taken very seriously in Islam. They believe in prayer five times a day: dawn, midday, afternoon, sunset, and evening, which is called the Salat. This is similar to Orthodox Judaism in which they pray in formal worship services three times a day; morning, afternoon, evening. They pray the Shema, which is the most important prayer in Judaism. Before prayer, Muslims wash up to their legs up to their knees and their arms up to their elbows to cleanse themselves. This is a bit similar to Christianity, which uses blessed holy water to pray with before entering mass. This blesses one’s self, recalls the baptism, and forgives sins. Each Islamic prayer is directed towards Mecca where the Kaaba is located, which they believe is loca ted directly under heaven. Women and men pray in parallel lines at separate times, and they pray on rugs to keep themselves clean. Also, there are certain guidelines that women and men need to follow in terms of what to wear to mosque. For example, a woman should not wear clothes that attract attention. In the European Christian Churches there are many dress codes one would need to follow. This is not the case in most Western Churches. The formalities have lessened and one can wear jeans to mass without causing uproar, which is much different from Islam. Judaism, Islam, and Christianity are similar religions when it comes to beliefs. While they have diverse opinions and take place in countries all over the world, these well known religions are revered for their perseverance. All three are valid religions, which, through different takes on past events, have moulded into what they are today. For example, while Christianity and Islam choose to believe that Jesus will come again, Judaism chooses not to. This take on a past event has shaped Christianity and Judaism greatly. Also, Islam has a different view of women’s rights and placement in society in comparison to Judaism and Christianity. I think that while Islam and Christianity are completely opposite when it comes to rituals and strictness, they are very much similar in terms of beliefs. Although Judaism and Islam originated from the same family tree and Judaism and Christianity coincide on many events, such as their origins, I believe that Judaism is the most different of the three due to its views about Jesus. Judaism, Islam, and Christianity are all completely different religions from an outsider’s point of view. Yet, when you look at all three of them in depth, a person can find many of the same characteristics.

Enhanced Oil Recovery By In Situ Combustion Environmental Sciences Essay

Enhanced Oil Recovery By In Situ Combustion Environmental Sciences Essay Enhanced oil recovery is oil recovery by the injection of materials not normally present in the reservoir. In situ Combustion (ISC) is the process of an enhanced oil recovery process to improve the recovery of heavy crude oil. As it is the oldest thermal recovery technique, it has been used for over nine decades with many economically successful projects. Nevertheless, it is regarded as a high-risk process by many, primarily because of many failures of early field tests. Most of those failures came from application of a good process (ISC) to the wrong reservoirs or to the poorest prospects. This paper contains a description of ISC, a discussion of laboratory screening techniques, an illustration of how to apply laboratory results to field design, a discussion of operational practices and problems, and an analysis of field results. For complete review, the case study is done on Balol and Santhal fields in Mehsana. In-situ combustion has been known since 1888. Mendeleev was the first scientist to suggest the in-situ conversion of coal into combustible gases. Based on the earlier laboratory results, Sheinman and Dubrovai in 1934 proposed the processed the process of oil displacement by means of a moving underground fire-front. A number of field tests, were performed in various regions in the late 1940s and early 1950s. The results from these tests indicated that the heat losses were large, therefore the injected hot gases reached the formation zone with zero thermal energy. These studies however were followed by laboratory research field tests and development of mathematical models to simulate in-situ combustion as a result of which this process has been recognized and can be used as a promising method of recovering heavy oil from petroleum reservoirs. The principle of in-situ combustion is to achieve combustion within the pores of hydrocarbon-bearing reservoir, burning part of the oil in place in order to improve the flow of the unburned part. Combustion is supported by the injection of air into the reservoir at one or more wells. The heat generated during combustion is sufficient to raise the rock to a high enough temperature to enable the combustion front to self propagate after initial ignition by increasing mobility of the fluid. Methodology The in-situ combustion process was applied to petroleum reservoirs depending on wide range of characteristics like Nature of formation, depth, temperature, reservoir thickness, permeability, porosity and oil saturation in order to recover oil. Pressure is also a factor but not much critical. The process was applied in reservoirs with average permeability ranging from 40 to 8000mD, whereas the oil saturation varied from 25 to 95%. In addition fuel content is one of the most important factors influencing the success of a fireflood process. The fuel content of the reservoir is the amount of coke available for combustion that is deposited on reservoir rock as a result of distillation and thermal cracking. If the fuel content is too low, the combustion process in the reservoir cannot be self sustained. Moreover, a high fuel content requires a large amount of air and high power cost which means low oil production. Gates and Ramey (1980) compared the estimated fuel content by various methods including laboratory results with that of field project data. It has been shown that fuel content determined experimentally in the laboratory by tube -run method can provide a reasonably good estimation of the fuel content obtained in the field. In situ combustion is basically injection of an oxidizing gas (air or oxygen-enriched air) to generate heat by burning a portion of the resident oil. Most of the oil is driven towards the producers by a combination of gas drive (from the combustion gases), steam and water drive. This process is also called fire flooding to describe the movement of a burning front inside the reservoir. Based on the respective directions of front propagation and air flow, the process can be forward, when the combustion front advances in the same direction as the air flow, or reverse, when the front moves against the air flow. Reverse Combustion This process has been studied extensively in laboratories and has been field tested. In brief, it has not been successful economically for two major reasons. First, combustion started at the producer results in hot produced fluids that often contain unreacted oxygen. These conditions require special, high-cost tubular to protect against high temperatures and corrosion. More oxygen is required to propagate the front compared to forward combustion, thus increasing the major cost of operating an in situ combustion project. Second, unreacted, coke-like heavy ends will remain in the burned portion of the reservoir. At some time in the process the coke will start to burn and the process will revert to forward combustion with considerable heat generation but little oil production. This has occurred even in carefully controlled laboratory experiments. In summary reverse combustion has been found difficult to apply and economically unattractive. Forward Combustion Forward combustion can be further characterized as dry when only air or enriched air are injected or wet when air and water are co-injected. Dry Forward Combustion The first step in dry forward ISC is to ignite the oil. In some cases auto-ignition occurs when air injection begins if the reservoir temperature is fairly high and the oil reasonably reactive. Artificial Ignition has been induced using down hole gas burners, electrical heaters, and/or injection of pyrophoric agents or steam injection. Figure : schematic illustration of the in-situ combustion process (Source) After ignition the combustion front is propagated by a continuous flow of air. As the front progresses into the reservoir, several zones exist between injector and producer as a result of heat and mass transport and the chemical reactions. The above figure is an idealized representation of the various zones and the resulting temperature and fluid saturation distributions. In the field there are transitions between zones. A. The burned zone is the volume already burned. This zone is filled with air and may contain small amounts of residual unburned organic solids. As it has been subjected to high temperatures, mineral alterations are possible. Because of the continuous airflow from the injector, the burned zone temperature increases from injected air temperature at the injector to combustion front temperature at the combustion front. B. The combustion front is the highest temperature zone. It is very thin, often no more than several inches thick. It is in this region that oxygen combines with the fuel and high temperature oxidation occurs. The products of the burning reactions are water and carbon oxides. The fuel is often misnamed coke. In fact it is not pure carbon but a hydrocarbon with H/C atomic ratios ranging from about 0.6 to 2.0. This fuel is formed in the thermal cracking zone just ahead of the front and is the product of cracking and pyrolisis which is deposited on the rock matrix. The amount of fuel burned is an important parameter because it determines how much air must be injected to burn a certain volume of reservoir. C/D. The cracking/vaporization zone is downstream of the front. The crude is modified in this zone by the high temperature of the combustion process. The light ends vaporize and are transported downstream where they condense and mix with the original crude. The heavy ends pyrolize, resulting in CO2 , CO, hydrocarbon gases and solid organic fuel deposited on the rock. E. The steam plateau. This is the zone where some of the hydrocarbon vapors condense. Most of those condense further downstream as the steam condenses. The steam plateau temperature depends on the partial pressure of the water in the gas phase. Depending on the temperature the original oil may undergo a mild thermal cracking, often named visbreaking that usually reduces oil viscosity. F. A water bank exists at the leading edge of the steam plateau where the temperature is less than steam saturation temperature. This water bank decreases in temperature and saturation downstream, with a resulting increase in oil saturation. G. The oil bank. This zone contains most of the displaced oil including most of the light ends that result from thermal cracking. H. Beyond these affected areas is the undisturbed original reservoir. Gas saturation will increase only slightly in this area because of the high mobility of combustion gases. Wet Forward Combustion A large amount of heat is stored in the burned zone during dry forward in situ combustion, because the low heat capacity of air cannot transfer that heat efficiently. Water injected with the air can capture and advance more heat stored in the burned zone. During wet combustion injected water absorbs the heat from the burned zone, vaporizes, moves through the burning front and condenses, expanding the steam plateau. This results in faster heat movement and oil displacement. Depending on the water/air ratio, wet combustion is classified as: (1) incomplete when the water is converted into superheated steam and recovers only part of the heat from the burned zone, (2) normal when all the heat from the burned zone is recovered, and (3) quenched or super wet when the front temperature declines as a result of the injected water. ISC requires particular attention to air compression, ignition, well design, completion, and production practices. Air compression causes high temperatures because of the high c p / cv ratio of air. Compressor design must consider these high temperatures to ensure continuous, sustained operations free from the corrosive effects of air and the explosion hazards of some lubricating fluids. Mineral oils are not recommended. Synthetic lubricants withstand the higher temperatures and offer lower volatility and flammability than conventional lubricants. In order to achieve the combustion in the petroleum reservoir, mainly Spontaneous ignition and Artificial ignition are the two methods that are used for heavy oil recovery. Ignition can occur spontaneously if the oil is reactive, the reservoir temperature high enough, and the reservoir is reasonably thick. Down hole gas-fired burners allow good control of the temperature of injected gases and may be operated at a greater depth than other methods. The disadvantages include the need to run multiple tubing strings in the injection wells. Catalytic heaters run at lower temperatures but are expensive. Electrical heaters can be lowered with a single cable, and can provide excellent temperature control. They can be reused repeatedly. There is, however, a depth limitation because of electrical power losses in the cable. Chemically enhanced ignition may require handling and storage of dangerous materials. Steam may be used to locally increase reservoir temperature and facilitate auto ignition . It suffers from depth limitation because of wellbore heat losses, but when the conditions are right it can be a very simple and effective method for ignition. Combustion process was also employed as primary and tertiary recovery processes. Applications In situ combustion can be applied to many different reservoirs. Some suggested screening guidelines are: Nature of the Formation : The rock type is not important provided that the matrix/oil system is reactive enough to sustain combustion. As in any drive process, high permeability streaks are detrimental. Swelling clays may be a problem in the steam plateau area. Depth: Depth should be large enough to ensure containment of the injected air in the reservoir. There is no depth limit, except that this may affect the injection pressure. Pressure: Pressure will affect the economics of the process, but does not affect the technical aspects of combustion. Temperature: Temperature will affect auto ignition but is otherwise not critical. Reservoir Thickness: Thickness should be greater than about 4m (15 ft) 2,3 to avoid excessive heat losses to surrounding formations. Very thick formations may present sweep efficiency problems because of gravity override. Permeability: This has to be sufficient to allow injection of air at the designed air flux. The air injectivity is especially important for heavy oil reservoirs. Conditions are favorable when kh /ÃŽÂ ¼ is greater than about 5md m/cp.3 Porosity and Oil Saturation: These have to be large enough to allow economic oil recovery. The product, à Ã¢â‚¬   So , needs to be greater than 0.08 for combustion to be economically successful. Oil Gravity: This parameter is not critical. Insitu viscosity has to be low enough to allow air injection and resulting oil production at the design rate. Oil Nature: In heavy oil projects the oil should be readily oxidizable at reservoir and rock matrix conditions. The laboratory experiments can also determine the amount of air needed to burn a given reservoir volume. This is key to the profitability of the process. Current Status of In-Situ Combustion The in-situ combustion process is attractive economically, provided it is applied to petroleum reservoirs containing approximately 50% oil saturation. The fuel content is one of the important parameters for combustion support at a relatively low air/oil ratio. Although laboratory experiments can provide some basic understanding of the process, the primary evaluation factor is a field application before the process is employed on a large scale. The present status of oil production by in-situ combustion in the United States is nearly 11,000 bbl/day. The commercial dry ISC project at Romania is the largest project of its kind and it has been in operation for more than 34 years. The Balol and Santhal projects in India have been in operation for more than seven years and have been applied in a wet mode. Currently, combined all these three projects produce approximately 2300m3 /day. It is likely that very little laboratory research can be performed to improve the displacement efficiency of this process. With continued improvement of the in-situ combustion technology, it is almost certain that some form of this process, such as dry, wet, and partially quenched combustion, will find greater application in the coming years. Currently, commercial In situ combustion projects are Economic Evaluation It is recognized that the success or failure of an enhanced oil recovery process depends on the economic evaluation. An economic study completed by Wilson and Root (1966), which is based on a modified form of two-dimensional model presented by Chu, compares the cost of heating a reservoir. The cost comparison was studied for a reservoir either in the presence of steam injection or forward combustion without oil production. The main consideration was to determine heating cost of the same dimensions of a reservoir by either steam injection or by forward combustion. The following conclusions were drawn from this study; (1) Combustion is favored over steam injection as the sand thickness decreases the pressure increase. (2) As the coke deposition increases, steam injection is favored over the combustion process. (3) As the heated distance in the reservoir increases, reservoir heating by combustion is more favorable as compared to steam injection. (4) Decreased injection rated favors the cost of steam injection relative to air. (5) Increased wellbore losses with increasing depth favor combustion. Conclusions It has been shown that in-situ combustion process is suitable to displace oils of gravities greater than 10 degree API. The average oil recovery by employing in-situ combustion is 50%. The major amount of oil is recovered before breakthrough of the combustion zone. For heavy oils, about 50% crude oil recovery occurs after breakthrough, whereas low-viscosity oil production declines very rapidly following breakthrough. The breakthrough of combustion zone can be recognized by an increase in gas production and its oxygen content. This is followed by a sharp increase ranging from 100 degree to 200 degree Fahrenheit in bottom hole temperature. In addition, the increase in water cut of the produced oil also indicates the breakthrough of the combustion zone. At the same time, pH of the produced water decreases, which is usually due to increase in the content of ions such as iron and sulphate. CASE STUDY IN-SITU COMBUSTION AT MEHSANA, GUJARAT. Mehsana asset, located in the northern part of Gujarat state in India is the highest oil producing onshore asset of ONGC with annual crude oil production of 2.35 MMT. Its having oil fields producing both heaviest crude and the lightest crude in India with API gravity ranging from 13ËÅ ¡ 42ËÅ ¡. Balol and Santhal fields form a part of this heavy oil belt with a API gravity 15ËÅ ¡-18ËÅ ¡. Balol and Santhal field encompass 22.17 MMT and 53.56 MMT of oil in place respectively. The crude is asphaltic in nature containing 6-8% asphaltene and the oil viscosity ranges from 50-450 cps at reservoir pressure of 100 kg/cm ² and 70ËÅ ¡ C temperature. Reservoirs have the permeability of the order of 3-8 darcies and are operating under active water drive. Subsequent Artificial lift methods resulted into high water production than oil. In many wells it became 95-100% and some wells had to be closed due to high water cut. The poor primary and secondary necessitated for In- Situ combustion technique in these fields. Exploitation of heavy oil from these heavy oil fields was a challenge for Mehsana asset. Based on results of laboratory studies, the In-situ combustion process was identified as the most suitable technique for enhancing the recovery from these fields. PILOT SCHEME A pilot test was designed and initiated in 5.5 acre area of southern part of Balol field in 1990-91. The first well CP#10 and thereafter Balol#171 were ignited with the help of foreign experts. The sustained combustion and production gain from nearby producers lead to conceptualization of the commercialization schemes in entire Balol field. In another attempt, a pilot scheme was also designed for Lanwa oil field and an inverted five slot pattern with four producer wells had been ignited in 1992. At present the commercialization of the scheme is in progress to enhance the production from the field. A pilot scheme is also running since 2002 in Bechraji field with four EOR injectors. COMMERCIAL SCHEMES Based on the techno-economic success of Balol Pilot project, commercial schemes were designed for entire Balol field for exploitation of heavy oil. Considering the similarities between the Balol and Santhal oil fields, this EOR technique has been implemented on a commercial scale in 1997 both at Balol and Santhal fields. Presently four commercial schemes viz. Balol Ph-1, Santhal Ph-1, Balol Main and Santhal Main are running successfully. Till date total 61 wells have been ignited in Balol and Santhal under these commercial schemes. More wells are in line for conversion into EOR injectors. For commercial exploitation of Balol and Santhal fields using In-situ combustion technique, four major air compressor plants, two, each in Balol and Santhal fields were set up. These plants supply compressed air to injector wells at reservoir conditions. Compressors except emergency air compressors at all the plants run on electricity. Combined installed capacity of these four plants is of compressing 4.9 NMm3/day air at maximum pressure of 123 Kg/cm2. Since water is required to be injected subsequently during wet phase, facilities for water treatment and injection are also installed in the respective plants. All these four plants are connected to each other with an integrated air grid network for better utilization of resources. A mobile unit called Ignition trailer is being used to initiate ignition process. Gas burners are used for artificial ignition in Mehsana. RESULTS After implementation of the technique, decline in production from Balol and Santhal fields was arrested. A number of wells have started flowing on self which were in artificial mode prior to in-situ combustion process. Production testing data of affected wells show the gradual increase in liquid production and decrease in water cut resulting increase in net oil production. Presently EOR gain from both the fields in the tune of 1200 TPD and air injection is in tune of 1.4MM Nm3/d. Production performance of these fields shows the gradual increase in oil production and decrease in W/C% with increasing number of injectors/air injection rate. It has not only given a new lease of life to Balol and Santhal fields but has also increased the oil recovery factor by 2-3 folds from 6-13% to 39-45%. OTHER HIGHLIGHTS OF THE PROJECT ONGC is one of the few organizations in the world, which has taken up In-situ combustion process on such a large scale. Total 68 wells have been converted in EOR injectors at Mehsana Asset so far. Most of the EOR injectors are old producer wells. They have been converted to injector wells after proper washing and cleaning of wells. Ignition is being done in the reservoir at an average depth of 990 meters, having 100 Kg/cm2 pressure and 70 degree Celsius temperature. Present Air-Oil ratio in these fields is about 1160 Nm3/m3 and Air-Oil ratio on cumulative basis it stands at 985 Nm3/m3, which indicates quite good efficiency of ISC process. Figure : Production profiles of Santhal and Balol fields (Source) MAJOR ISSUES Occurrence of Auto-Ignition: In Mehsana Gas burner is being used for artificial ignition. In this method air is injected through the annulus and natural gas through tubing. An aluminum plug fitted at the tip of burner prevents air and gas to mix. The plug pops out when gas injection pressure is more than air injection pressure and forms gas-air mixture at the bottom. A pyrophoric chemical is being used to initiate the flame. At well no. Balol # A on 1998 the burner caught fire without lowering pyrophoric liquid. Burner temperature shot up to 910 degree Celsius and was soon controlled by ignition tem members. There was no damage to thermocouple and down-hole assembly in this well. After this incidence auto ignition occurred successively in another three wells. In last two wells Santhal #B and Balol # C, thermocouple got damaged. Ignition experts were unable to establish the reason and remedy for auto ignition. Due to this failure, ONGC had completely suspended all the ignition operations fearing further auto igni tion and damage to thermocouple. A close study of all four cases of auto ignition revealed that gas injection was used to be done at full discharge rate of gas compressor. Due to this sudden release of huge amount of gas, a very rich mixture of air and gas forms making situation vulnerable for auto ignition. To overcome this problem, ignition team came up with an idea to put a cushion of an inert gas in the tubing before starting gas injection. At the time of plug pop up, now this inert gas release first afterwards natural gas comes in contact with air. This cushion provide ample time between plug pop up and release of natural gas which facilitate in regulating the gas injection rate to prevent formation of unwanted combustible mixture. The whole idea was put up before the management which was promptly agreed and broke the dead lock of suspended ignitions. After adoption of this technique till date no case of auto ignition encountered. EFFECTIVE UTILIZATION OF AIR COMPRESSOR Compression of air at high pressure is a costly affair because of huge consumption of electricity. To minimize this wastage of energy and for optimize the utilization of air compressors, it was thought to connect all the four plants with a common air grid. Subsequently the air grid was constructed using 6 and 4 dia pipelines as required. Now compressors are being run as per the total air requirement. By using this grid, on an average INR 2.0 Crores per month (USD 5.3 million per annum) are being saved as electricity charges. FAILURE OF AFTER COOLER OF AIR COMPRESSOR Running of large air compressor is difficult in India especially during summer due to high temperature. It may lead to explosion at compressed air piping due to accumulation of carryover lubricants and high discharge temperature. Two incidents of bursting of 3rd stage (Final stage) after coolers of HP compressor had taken place at a compressor plant of Santhal field. As a remedy synthetic lubricant has been introduced. Further regular chemical cleaning of the lines is being carried-out and monitoring of operational parameters has been intensified. OOZING OF AIR/FLUE GASES In Mehsana, mostly old wells were used for injection as well as for production. In some cases failure of casing or cementation have observed and has caused pressure built-up in outer casing and even in some cases oozing of gases/air from well site has also been observed. The remedies are 1) New additives for cementation (like thermal cements and calcium aluminates) have been introduced which help to withstand higher temperatures. 2) It is recommended to cement the casing to the full depth in case of new injector wells to prevent the risk of coming out of gas into overlying permeable layers. 3) It is suggested by IEOT (ONGC Institute) to have casing of API 5CT L-80 13 Cr steel in new injector wells and tubing in all wells. 4) New injector wells are being drilled to suit specially for in-situ combustion. 5) Regular monitoring of injection pressure, annulus pressure and outer casing pressure. Research Work Figure : showing the working model made in the laboratory The working model for the In situ combustion was made in laboratory. In this model Injection well and the production well is present on the left and right side respectively, gas injection at high pressure, igniter is taken as the kitchen lighter, test tube is made as an artificial reservoir and ignition zone near the artificial reservoir and also the temperature showing device at the bottom of the production well. This model can be compared to the real conditions with the help of the following diagram. Figure : In situ combustion process (source) There were many challenges during the modeling. These challenges were faced according to the need, economy and the factors available. For example reservoir simulation was not perfect, combustion zone was not able to be built exactly in the pores due to lack of oxygen supply. Hence I discover that this process is very economical as compared to other EOR processes but it is very risky as injection of gas should be done at correct place and ignition should be controlled then this process acts as magic recover the oil to 65%. I was successful in recovering the oil but the simulation problem was a main constraint of this working model as that requires a whole laboratory for its working. Hence according to my research heat loss should be minimum, combustion should be in controlled manner are the major challenges that should be overcome. And these can be overcome by calculating the area in which injection is to be done and what should be the ignition system use for ignition (whether a chemical can be used, artificial igniter at the combustion can be used or if the temperature of the bottom of the hole is very high that can give spontaneous ignition) should be preplanned according to the condition. The latest and important factor is the chemical injection to ignite the heavy crude oil, let us suppose the oil present there is very heavy oil that cannot be directly ignited; for that situation a chemical can be injected inside which will burn first and then increases the temperature of the respective zone to such an extent that the oil present there will ignite and the further process should start.

Development of Sustainable Water Management System

Development of Sustainable Water Management System 1.0 Introduction A regeneration project close to Bedford will see the construction of a hotel and a school, with both intended to be sustainable. Hunt et al. (2006) judge a developments sustainability based upon its impact upon the local environment, its cost effectiveness, both during and after construction, and also its impact upon society. These factors tend to relate, to varying degrees on different projects, to how sustainable the developments water usage is. Taking this into account, those designing and building the school and the hotel have put considerable time and effort into ensuring that the projects water management setup is from the very top of the line. The following report focuses on the design and implementation of the regeneration projects water management system, calculating the respective quantities of water required for the school and for the hospital to run effectively and evaluating the alternative green solutions available to ensure efficient use of water in the two buildings. Among the green technologies looked at, consideration will be given to collection, storage and usage of rainwater to supplement the water supply sourced from utilities companies. Recycled grey water will also be discussed as a possible means of saving water. Lastly, the report will look into methods of conserving water, explaining how they would be implemented and how effective they would be if utilised on this particular project. 2.0 Description of the Regeneration Project The school that is being constructed will be co-ed and will enrol up to 150 students, catering to children between the ages of six and twelve years old. The school will have a staff of sixteen: eight on full-time contracts, two providing maintenance services and the rest working on a part-time basis. The hotel that is being built will consist of fifty double-rooms and will take on four members of staff on a full-time basis. The schools roof will be made from pitched tiles, taking up approximately 385 m ­2, and approximately 600 m2 of smooth surface. The hotels roof will also be made from pitched tiles, but with no smooth surface. It will take up approximately 1,200 m2. 3.0 Estimating water requirements for the school and the hotel In order to come up with a water strategy, the water requirements of the two buildings must first be approximated. Bradford (2007) notes that for different kinds of end users, there are a variety of purposes that water can be used for, giving the example of the dissimilarity in the water usage patterns of domestic users compared with agricultural users. 3.1 Water requirements for the school The figures in Table 3.1 calculate the schools overall water consumption as being at 720 m3/year. Figure 3.1 breaks down the schools water consumption categorically, displaying the main uses to which water is put in terms of quantity. Flushing toilets takes up the largest proportion (36%) of water consumption (see Figure 3.1). 3.2 Water requirements for the hotel Hunt et al. (2006) note that there is great variation in the use of water at hotels. What consumption patterns there are tend to relate to water usage by the hotels guests, the presence or absence of a hotel swimming pool and the hotels star rating. As there is insufficient data regarding the hotels star rating and water consumption, a water usage estimate of 30 m3/bed space/year is made, as this is displayed in Table 3.2 (Waggett and Arotsky, 2006) to be the typical consumption in hotels without a rating that do not have swimming pools. With the average requirement of water estimated at 30 m3/bed space/year and with a total of fifty double-rooms, total demand can be approximated to be = 30*50*2 = 3000 m3. Hotels use their water supply for bathing, flushing toilets, drinking, cooking, cleaning and gardening. With no data available which can be used to break down water usage into its constituent elements, this is estimated using average UK domestic use (see Figure 3.2) and modified UK hotel use, based on single occupants (see Figure 3.2). 4.0 Non-potable water supply options for the school and the hotel Hastings (2006) differentiates between water that is fit for drinking, known as à ¢Ã¢â€š ¬Ã‹Å"potable water, and à ¢Ã¢â€š ¬Ã‹Å"non-potable water which, while it is not fit for ingestion, may still be utilised to flush toilets, for cleaning vehicles, buildings or clothes (in washing machines) or to irrigate land. While all non-potable water fails to meet the minimum required standards for drinking water, Hastings makes a further distinction between treated non-potable water, known as green water, and untreated non-potable water, referred to as grey water. 4.1 Rainwater harvesting (RH) The EA (2003) notes that rainwater collection may occur by gathering the water from roofs or from hard surfaces such as roads using down pipes (see Figure A-1 in the Appendix). The rainwater gathered can be utilised for any number of non-potable water uses. An approximation will be made here of the expected rainwater harvest from the two buildings being constructed. The rainwater harvests quality varies with elements from outside, like the amount of leaves or bird droppings contaminating the harvest. The impact of these elements can be lessened with the use of a protective filter to cover the rainwater outlet (Cornwall Energy Efficiency Advice Centre, 2007). The EA (2003) also notes that rainwater is of a good enough standard to not need treatment after it has been collected, before it can be used. The gathered water will be kept in an over-ground plastic tank, with its placement selected so as to minimise bacteria growth in hot weather, while also minimising frost when the weather is cold. Line filters will also be put in place. With the right choice of filter and of placement, bad smells and water discolouration can be lessened. 4.1.1 Determination of the quantity of gatherable rainwater for the hotel and The school Accurately calculating the best quantity of gatherable rainwater for the two buildings calls for a plan of the roofs catchment areas and also for rainfall data relating to the local area (see Figure 4.1) (covering the previous 20 years) It is not possible to gather all of the rain that falls on the buildings and transfer it to the plastic container in its entirety. Usually, rainfall harvests lose something in the region of 10%-60% of the water, varying with the kind of roof in question, the drainage coefficient of the material it has been made from (see Table 1) and the filter efficiency: always à ¢Ã¢â€š ¬Ã…“0.9à ¢Ã¢â€š ¬?. It is also possible to lose rainwater if the container it collects in overflows due to heavy rainfall or low water usage (ibid, 2003). Table 4.1: Drainage coefficient for different roof types Roof type Runoff coefficient Pitched roof tiles 0.75 0.9 Flat roof with smooth tiles 0.5 Flat roof with gravel layer 0.4 0.5 (Source: EA, 2003) Based on the aforementioned data, it is possible to work out the potential rainfall harvest in a particular location by inputting the data into this formula (EA, 2008): Q = AAR x TCA x RC x FC where Q = Annual Gatherable Rainfall (litres) AAR = Annual Average Rainfall (mm/yr) TCA = Total Catchment Area (m2) RC = Runoff Coefficient FC = Filter Coefficient 1. For the school As, logically, a larger roof will allow for the collection of a greater quantity of rainwater, it is important to be aware of the roof area. The roof surface areas and their construction materials are: Pitched roof tiles 600 m2 Flat roof (smooth surface) 385 m2 According to Table 4.1, the minimum possible RC for pitched roof tiles is 0.75, while the RC for smooth surface roofs is 0.5 AAR = Annual Average Rainfall (mm/yr) =à ¢Ã‹â€ Ã¢â‚¬Ëœ Average Rainfall (mm) for the 12 Month period illustrated by Figure 4.1 = 573mm The Annual Collectable Rainfall (litres), Q = ((600 m2 X (573 mm) X 0.75) + (385 m2 X (573 mm) X 0.5)) X 0.9 = 331,337.25 litres per annum. = 331.34 m3 per annum. This is a lower value than that of the predicted total annual water demand for the school. 2. For the hotel The hotels roof area is 1,200 m2, entirely made from pitched roof tiles. Q = 1,200 X 573 X 0.75 X 0.9 = 464,130 litres per annum = 464.13 m3per annum. This value also falls below predicted annual water demand for the hotel. Table A-1 (see Appendix A) approximates the monthly rainfall harvest for the two buildings, using the aforementioned equation and using the RC of pitched roof tiles. The figures for the predicted rainfall harvest and the predicted water requirements point to a shortfall in the ability of the rainwater to fulfil the projects water requirements. However, the rainwater may still play a significant role, perhaps covering the two buildings toilet flushing needs, for instance. 4.1.2 Sizing the storage tank in the RH system for the two buildings The EA (2003) notes that the storage tanks purchase price is the most expensive element of setting up the RH system and so deciding upon the right size for it is very important. The biggest tank will not necessarily be the most efficient in the long run and so it is important to work out the optimal size, so that the buildings can harvest sufficient rainwater without overspending. The quantity of water that is kept in the tank should ideally approach the quantity that is required to service the two buildings. The choice of tank must account for price, size and a minimum of two water overflows each year, in order to get rid of unwanted objects in the tank-water. The project planners may also want to invest in a first flush device (Well, 2003) to ensure that the initial water flow, which will contain debris that has collected on the roof, does not enter the tank, keeping its contents relatively clean. The makers and retailers of the rainfall harvest setup will have means of determining the best tank size for the project. In fact, some of them have applications available for visitors to their websites to work out the optimum size for their needs (e.g. Klargesters Envireau products, available at www.klargester.com) and these are handy for making an initial estimate of how much they need to spend. It is best for the planners to go on to discuss this choice with experts in this area. Figure 4.2: Water balance for approximation of rainwater storage capacity The EA (2003) notes that the capacity needed will vary according to elements including rainfall patterns, catchment areas, demand patterns, retention time, cost of parts and the cost of and access to alternative supplies. The Development Technology Unit (2008) also states that the level of capacity needed will be based upon several elements, such as weather and rain data, roof surface area, RC and data regarding the number of consumers and the amount of water they use on average. It goes on to suggest several means of setting the size of system parts: Method 1 the demand-side approach (see Appendix A). Method 2 calculating the size of the tank based on elements such as storage capacity, overflow and drainage (the supply-side approach) (see Appendix A). Method 3 computer model (see Appendix A). The methods differ in terms of how sophisticated and how complex they are. Some of them can easily be undertaken by people without specialist knowledge, whereas some need specialists familiar with complicated software. The major elements contributing to the method selected include: the size and the complexity of the system and its parts the availability of the components that are necessary to operate using a specific method (e.g. computers) the required skills and technical knowledge/training among the practitioners/designers. Also, according to the EA (2008), tank size tends to be based upon either the capacity required for 18 days or a 5% share of the annual yield (whichever of the two is lower). This method will be combined with the supply-side method to determine the tank capacity for this project (see Appendix A). 1. Calculating the optimal tank size based upon the predicted rain yield: The EA (2003) formula for working out the best tank capacity for the rainfall harvest setup is as follows: Tank capacity (litres) = Roof area (m2) x drainage factor x filter efficiency x annual rainfall (mm) x 0.05 For the school Optimal tank capacity (litres) = (600* 0.75* 0.9* 573 mm*0.05) + (385*0.5* 0.9* 573 mm*0.05) = 16566.86 litres = 16.57 m3 For the hotel Optimal tank capacity (litres) = (1,200* 0.75* 0.9* 573 mm*0.05) = 23206.5 litres = 23.21 m3 2. Calculating the optimal tank capacity using the idea of holding 18days- worth of demand: Collection tank volume = days storage x average daily demand For the school The à ¢Ã¢â€š ¬Ã‹Å"Estimating water demands for the hotel and school section and the figures in Chapter 3 show that the overall quantity of water used to flush toilets, irrigate soil and clean is 612 m3 per annum for the school building. This exceeds the estimated annual rainfall harvest. This being the case, the RH tank will provide water for flushing toilet, with the tank storage for 18 days equalling: (268 m3/365 days)*(18 days) = 13.22 m3 For the hotel According to the figures in Chapter 3, the overall average water requirement at the hotel is 3000 m3. The quantity used to flush toilets, irrigate soil and clean amounts to roughly 53% of the hotels water requirement: roughly 1590 m2 per annum. This requirement cannot be covered in total by the RH alone. This being the case, the RH will be limited to cleaning and/or irrigating or to flushing toilets. Even within these limitations, there may not be sufficient rainwater for these tasks. Using the average daily requirement for toilet flushing: the tank storage = (3000 x 0.35) m3/365days x 18 = 51.79 m3 Using the average daily requirement for cleaning or irrigating: the tank storage = (3000 x (0.12 + 0.06)) m3/365days x 18 = 26.63 m3 Using the aforementioned EA (2003) data, a smaller size is optimal. This being the case, if the RH is used to flush toilets, the respective tank sizes for the hotel and the school are going to be 23 m3 and 14 m3. If the method of estimation used is the supply-side method (i.e. it is based upon capacity, overflow and drainage (see the tdix A)), the the optimal respective tank sizes for the hotel and the school will be 35 m3recomm3 m3 and 35 m3ing for these figures is represented bycalculations ad A-3 (seein Appendix A)The selection ultimately made may depend on a combination of these methods of calculation, as well as the price of the tankAfter this, th 4.2 Grey water recycling at the school and the hotel Metcalf and Eddy (1991) refer to two kinds of wastewater. These are grey and black wastewater. Black water has been flushed down toilets, passed through the drainage system and on to treatment plants. Black water is contaminated with more pollutants than grey water. Grey water accounts for all of the wastewater which has not been used to flush toilets (EA, 2003). It can be treated and then reused for flushing toilets or irrigating soil (Metcalf and Eddy, 1991). Both Waggett (2004) and the EA (2008) refer to grey water from washing machines, kitchen sinks and dishwashers as black wastewater, as it is heavily contaminated and can contain large amounts of grease and food particles. Figures 3.1 and 3.3 illustrate that the two buildings will produce grey water at the levels of 55% at the hotel and 32% at the school, 32% and al. (2007) nostate thatis typeg is treated usingrequires biologicalnt systems,by followed by sand filters andts, as the water is heavily contaminatedion because of the high levels treatmeused to flush toilets or irrigate soilThis treated water can be used for toilet flushing and grounwash basins were be colltic decreasing would occur. Collecteequires a physting oninfected sandsith disinfection and membranes suct et al, 2006). This treated watd to flushfor toilets flushing. Figure 4.3: Schematic of the grey water recycling system to be installed (Source: Birks et al., 2001) Grey water is of lower quality than harvested rainwater and always needs treatment before it is used; There areinotgenerally recognised official aegulations regarding grey waters standard of cleanliness before it can be reusedtoPidou et al., 2007) and individual nations decide upon their own minimum quality requirements. Fs it stands, the UK has no official regulations regarding wastewater usageUnfy wain ). Waggett (2004) nostates thahis lack of legislation is a limiting factor to grey and rainwater usage.one of the eyd rainf standards have been put forward by a number of organisations, complicating matters for those wishing to make use of these green solutionsThis makes a sufficient specificationt the subject have found that project planners should ideally set up The majority of the studies available conclude that it is best to operat level of of a health risk exists and what forms of water treatment they should make herefore, the level of treatment required. There are some highly d etailed research papdocor the water quality standards for non-potable water re and greywatergrey water) wn in Appendix B. For the project under consideration here, it would probably be best to gather and treat grey water for use in toilet flushingf Figures 3.2 and 3.3 display the grey water percentages from showers, baths and hand basins as being 28% for the hotel and 2% for the schools As the school produces relatively little grey water, it is probably best not to bother recycling it in the case of this building, for cost effectiveness purposesTrn the scrin it. He hotel pr a significant quantity of grey water, which will be worth reusing. According toTherefore, economically only the greywbe ey water is generallyeopriate technology for community buildings such as schools, libraries, places of worship and community centresà ¢Ã¢â€š ¬?. The health risks associated with This is because of the potential concerns wither, parthildren are likely to be presresponsible for this. cleanliness especially where children are exposed to the water and little greywatergrey watinn technology would no ve in the case ft According to Waggett (2004), non-potable (grey or RH) water can be utilised for sub-surface irrigation, as long as no spray mechanisms are involved. à ¢Ã¢â€š ¬Ã…“Direct reuseà ¢Ã¢â€š ¬? is another option in areas like laundries (e.g. reusing water from the final rinse for the next washs first rinse). This application may be included in the hotels design and implemented during construction, though many hotels outsource their clothes cleaning services. recycling shows the methodology for the design of the grey water recycling system. The hotels grey water will provide 80% of its total water requirement for flushing toilets (28% grey water compared to 35% needed for flushing), with potable water or rainwater automatically supplementing the produced rrecyclin collectio only at 2s insufficient tof theile (see Figure 4.1). recycling004) noteshows thatandit is possible wateh be used in one water setup, and while this increases the quantity of water collected from that which could be expected from a simple RH system, it creates a need for a larger tank to store all of the water and for a greater quantity of chemicals with which to treat the water, both of which will be costly for the projectand rainwater in the same watys 5.0 Discussion and quantification of options for water conservation at the development site Braithwaite (2006) posits that all developments that aim to be sustainable need to contribute positively to society, be sympathetic to their local environment and ensure that they are cost effective. These factors are referred to as the pillars of sustainable development (Hunt and Rogers, 2005). This part of the report evaluates the potential methods for decreasing the buildings water requirements in terms of their impact upon the aforementioned pillars of sustainable development. The cost effectiveness of the options If less water is required, then less money will be spent on sewage treatment and savings will also be made in terms of spending on water (Otterpohl, 2006). The savings on water will not necessarily be very large, as UK water prices are not high. The savings made by implementing the green technologies would need to be set against the cost of their implementation in order to work out how long it would take for them to financially justify the expenditure. The necessary predictions of expected usage would be difficult to make, particularly for the school building, which would have very low usage during holiday periods. In the case of the school, grey water would probably not be cost effective (as discussed earlier) and would probably need a very long time to make sufficient savings to cover is not co2003) estimate a 30% saving on water expenditure is needed to justify investment in the reuse of grey water and it is unlikely that this would be achieved at the schoolMoreover, at the se kitchen eyecyclis Grey water would, however, be cost effective in hotels; especially big hotels with en-suite accommodation, as customers would consume large quantities of water systems afihite bathrooms and powerful showers an expected part of modern hotels, water consumption is actually higher in the newer establishments, making recycling of non-potable water even more relevantUnlike the majoritutilise treated grey water for toilet flushing when it is busy and revert to its main supply when there are few customer, in order to avoid keeping the grey water in their tank for extended periods. This is common practice in countries with low rainfallrefore, greywatergrey water is The extra setup required to circulate the treated grey water around the hotel would need significant expenditure from those funding the project and this would have to be given serious thought before deciding whether it would pay off in the long term. Rain harvesting setups are fairly commonplace at UK schools, as the water is considered to be fairly clean and the running costs are not too. With a lot of water used for toilet flushing, there would be a need for a big tank at the school, which could lead to a big saving over. To carry out a similar harvesting operation, the hotel would require both a large harvesting area (on the roof) and sufficient room to keep the tank. This would probably not be workable for most hotels. Establishments with swimming pools might consider harvesting and treating water to use in their pool. Social costs The costs to society of these solutions would take the form of problems with their acceptability and/or their reliability (Hunt et al., 2006) (see Appendix C). Environmental costs Braithwaite (2006) views sustainability and environmental protection as being more or less the same thing, with an emphasis upon ensuring that the construction and the running of the buildings is not damaging to the local area going forward. To ensure this does not happen, evaluation of the likely negative externalities of the technologies put forward is needed. Water sustainability for the project might be measured in terms of factors such as impact on the climate, biological diversity and resource depletion. While all of these factors have an environmental aspect to them, climate effects can also create problems in economic terms as well as problems for society in general (Hunt et al., 2006). The recommended technologies need to be beneficial in terms of future sustainability, with emphasis placed on decreasing both the quantity of water that is wasted and the quantity that is obtained from the mains source. Integrated costs On most projects, planners would tend to opt for familiar solutions that are known to be effective over new ones which they might perceive as inherently risky and this might be a factor in the selection made here, particularly in the case of the school, given consideration of the involvement of children (Hunt et al., 2006). As well as the interests of the planners and developers, it is important perhaps most important to give consideration to how the solutions would impact upon the people ultimately using the facilities being discussed. With no official standards for the condition required of non-potable water before it can be used, careful planning is needed to make certain that no errors are made that could potentially cause harm to customers or students. Hotels often take the precaution of labelling water sources such as sinks that provide non-potable water. Another precaution, which might be made use of at the school, would be to use quality gpes (EA, 2008). Prior to selecting one of the options, the projects planners should assess how efficient they are by looking into both how secure and how durable their supply of water will be (Hunt et al., 2006). With the rainfall system being wholly reliant upon the weather, this is quite an insecure option, as unexpectedly dry weather will significantly harm the effectiveness of the solution. This might put off the planners, particularly in the case of the hotel, with grey water reuse preferred due to its greater regularity of supply, regardless of the changing seasons, climate or weather patterns recyclingal., 2006). Therefore 6.0 Conclusions and recommendations The report posits an approach to setting up a sustainable system for managing water at a brownfield development site where a hotel and a school are being constructed. The buildings water requirements are approximated from information provided from the exercise paper and CIRIA report no. C657. The report also considers two alternatives for green technologies to help ensure that the buildings have a sustainable water supply, namely the harvesting of rainfall and the reuse of grey water from the buildings recyclinglutions would both provide non-potable water, with the rainwater of a higher standard than the grey water, which would require treatment before it could be reintroduced to the water system, even for uses not involving human ingestion supplied from thes or regulations regarding RH or grey water quality in the United Kingdom, it would be best to utilise the water for functions such as sub-surface irrigation or flushingAs there are not agreed wateould provide sufficient water to fully supply these functions, but could still significantly supplement the water provided by the mains supplyIn addition, that all these uses can not be fully coven to analyse poteo, there iscription in order to identify the methods of qurnservation at the school and the hotel, ultimately recommending that. water produced by grey water treatment and RH should be utilised for toilet flushing, so as to make savings on water costs and sewage fees. the RH setup is better suited to the school in terms of sustainability, cost effectiveness and viability than the grey water reuse setup and should be implemented at the school with no grey water treatment operation introduced. grey water and RH setups should be implemented for the hotel, either in a combined system or separately, so as to make savings and improve the hotels water sustainability by supplying the establishments toilet flushing function. water costs and sewage fees are fairly cheap, whereas the costs of implementing either of the suggested green solutions are significantly higher, meaning that these technologies are not commonplace in the UK recyclingthe current situation, population growth and environmental changes are likely to create greater water scarcity and make these approaches to the provision of non-potable water far more common, with governments legislating in their support. However, the growi there is a need for the EA, the government or another relevant organisation to set up official regulations for non-potable water quality in the UK. Development of Sustainable Water Management System Development of Sustainable Water Management System 1.0 Introduction A regeneration project close to Bedford will see the construction of a hotel and a school, with both intended to be sustainable. Hunt et al. (2006) judge a developments sustainability based upon its impact upon the local environment, its cost effectiveness, both during and after construction, and also its impact upon society. These factors tend to relate, to varying degrees on different projects, to how sustainable the developments water usage is. Taking this into account, those designing and building the school and the hotel have put considerable time and effort into ensuring that the projects water management setup is from the very top of the line. The following report focuses on the design and implementation of the regeneration projects water management system, calculating the respective quantities of water required for the school and for the hospital to run effectively and evaluating the alternative green solutions available to ensure efficient use of water in the two buildings. Among the green technologies looked at, consideration will be given to collection, storage and usage of rainwater to supplement the water supply sourced from utilities companies. Recycled grey water will also be discussed as a possible means of saving water. Lastly, the report will look into methods of conserving water, explaining how they would be implemented and how effective they would be if utilised on this particular project. 2.0 Description of the Regeneration Project The school that is being constructed will be co-ed and will enrol up to 150 students, catering to children between the ages of six and twelve years old. The school will have a staff of sixteen: eight on full-time contracts, two providing maintenance services and the rest working on a part-time basis. The hotel that is being built will consist of fifty double-rooms and will take on four members of staff on a full-time basis. The schools roof will be made from pitched tiles, taking up approximately 385 m ­2, and approximately 600 m2 of smooth surface. The hotels roof will also be made from pitched tiles, but with no smooth surface. It will take up approximately 1,200 m2. 3.0 Estimating water requirements for the school and the hotel In order to come up with a water strategy, the water requirements of the two buildings must first be approximated. Bradford (2007) notes that for different kinds of end users, there are a variety of purposes that water can be used for, giving the example of the dissimilarity in the water usage patterns of domestic users compared with agricultural users. 3.1 Water requirements for the school The figures in Table 3.1 calculate the schools overall water consumption as being at 720 m3/year. Figure 3.1 breaks down the schools water consumption categorically, displaying the main uses to which water is put in terms of quantity. Flushing toilets takes up the largest proportion (36%) of water consumption (see Figure 3.1). 3.2 Water requirements for the hotel Hunt et al. (2006) note that there is great variation in the use of water at hotels. What consumption patterns there are tend to relate to water usage by the hotels guests, the presence or absence of a hotel swimming pool and the hotels star rating. As there is insufficient data regarding the hotels star rating and water consumption, a water usage estimate of 30 m3/bed space/year is made, as this is displayed in Table 3.2 (Waggett and Arotsky, 2006) to be the typical consumption in hotels without a rating that do not have swimming pools. With the average requirement of water estimated at 30 m3/bed space/year and with a total of fifty double-rooms, total demand can be approximated to be = 30*50*2 = 3000 m3. Hotels use their water supply for bathing, flushing toilets, drinking, cooking, cleaning and gardening. With no data available which can be used to break down water usage into its constituent elements, this is estimated using average UK domestic use (see Figure 3.2) and modified UK hotel use, based on single occupants (see Figure 3.2). 4.0 Non-potable water supply options for the school and the hotel Hastings (2006) differentiates between water that is fit for drinking, known as à ¢Ã¢â€š ¬Ã‹Å"potable water, and à ¢Ã¢â€š ¬Ã‹Å"non-potable water which, while it is not fit for ingestion, may still be utilised to flush toilets, for cleaning vehicles, buildings or clothes (in washing machines) or to irrigate land. While all non-potable water fails to meet the minimum required standards for drinking water, Hastings makes a further distinction between treated non-potable water, known as green water, and untreated non-potable water, referred to as grey water. 4.1 Rainwater harvesting (RH) The EA (2003) notes that rainwater collection may occur by gathering the water from roofs or from hard surfaces such as roads using down pipes (see Figure A-1 in the Appendix). The rainwater gathered can be utilised for any number of non-potable water uses. An approximation will be made here of the expected rainwater harvest from the two buildings being constructed. The rainwater harvests quality varies with elements from outside, like the amount of leaves or bird droppings contaminating the harvest. The impact of these elements can be lessened with the use of a protective filter to cover the rainwater outlet (Cornwall Energy Efficiency Advice Centre, 2007). The EA (2003) also notes that rainwater is of a good enough standard to not need treatment after it has been collected, before it can be used. The gathered water will be kept in an over-ground plastic tank, with its placement selected so as to minimise bacteria growth in hot weather, while also minimising frost when the weather is cold. Line filters will also be put in place. With the right choice of filter and of placement, bad smells and water discolouration can be lessened. 4.1.1 Determination of the quantity of gatherable rainwater for the hotel and The school Accurately calculating the best quantity of gatherable rainwater for the two buildings calls for a plan of the roofs catchment areas and also for rainfall data relating to the local area (see Figure 4.1) (covering the previous 20 years) It is not possible to gather all of the rain that falls on the buildings and transfer it to the plastic container in its entirety. Usually, rainfall harvests lose something in the region of 10%-60% of the water, varying with the kind of roof in question, the drainage coefficient of the material it has been made from (see Table 1) and the filter efficiency: always à ¢Ã¢â€š ¬Ã…“0.9à ¢Ã¢â€š ¬?. It is also possible to lose rainwater if the container it collects in overflows due to heavy rainfall or low water usage (ibid, 2003). Table 4.1: Drainage coefficient for different roof types Roof type Runoff coefficient Pitched roof tiles 0.75 0.9 Flat roof with smooth tiles 0.5 Flat roof with gravel layer 0.4 0.5 (Source: EA, 2003) Based on the aforementioned data, it is possible to work out the potential rainfall harvest in a particular location by inputting the data into this formula (EA, 2008): Q = AAR x TCA x RC x FC where Q = Annual Gatherable Rainfall (litres) AAR = Annual Average Rainfall (mm/yr) TCA = Total Catchment Area (m2) RC = Runoff Coefficient FC = Filter Coefficient 1. For the school As, logically, a larger roof will allow for the collection of a greater quantity of rainwater, it is important to be aware of the roof area. The roof surface areas and their construction materials are: Pitched roof tiles 600 m2 Flat roof (smooth surface) 385 m2 According to Table 4.1, the minimum possible RC for pitched roof tiles is 0.75, while the RC for smooth surface roofs is 0.5 AAR = Annual Average Rainfall (mm/yr) =à ¢Ã‹â€ Ã¢â‚¬Ëœ Average Rainfall (mm) for the 12 Month period illustrated by Figure 4.1 = 573mm The Annual Collectable Rainfall (litres), Q = ((600 m2 X (573 mm) X 0.75) + (385 m2 X (573 mm) X 0.5)) X 0.9 = 331,337.25 litres per annum. = 331.34 m3 per annum. This is a lower value than that of the predicted total annual water demand for the school. 2. For the hotel The hotels roof area is 1,200 m2, entirely made from pitched roof tiles. Q = 1,200 X 573 X 0.75 X 0.9 = 464,130 litres per annum = 464.13 m3per annum. This value also falls below predicted annual water demand for the hotel. Table A-1 (see Appendix A) approximates the monthly rainfall harvest for the two buildings, using the aforementioned equation and using the RC of pitched roof tiles. The figures for the predicted rainfall harvest and the predicted water requirements point to a shortfall in the ability of the rainwater to fulfil the projects water requirements. However, the rainwater may still play a significant role, perhaps covering the two buildings toilet flushing needs, for instance. 4.1.2 Sizing the storage tank in the RH system for the two buildings The EA (2003) notes that the storage tanks purchase price is the most expensive element of setting up the RH system and so deciding upon the right size for it is very important. The biggest tank will not necessarily be the most efficient in the long run and so it is important to work out the optimal size, so that the buildings can harvest sufficient rainwater without overspending. The quantity of water that is kept in the tank should ideally approach the quantity that is required to service the two buildings. The choice of tank must account for price, size and a minimum of two water overflows each year, in order to get rid of unwanted objects in the tank-water. The project planners may also want to invest in a first flush device (Well, 2003) to ensure that the initial water flow, which will contain debris that has collected on the roof, does not enter the tank, keeping its contents relatively clean. The makers and retailers of the rainfall harvest setup will have means of determining the best tank size for the project. In fact, some of them have applications available for visitors to their websites to work out the optimum size for their needs (e.g. Klargesters Envireau products, available at www.klargester.com) and these are handy for making an initial estimate of how much they need to spend. It is best for the planners to go on to discuss this choice with experts in this area. Figure 4.2: Water balance for approximation of rainwater storage capacity The EA (2003) notes that the capacity needed will vary according to elements including rainfall patterns, catchment areas, demand patterns, retention time, cost of parts and the cost of and access to alternative supplies. The Development Technology Unit (2008) also states that the level of capacity needed will be based upon several elements, such as weather and rain data, roof surface area, RC and data regarding the number of consumers and the amount of water they use on average. It goes on to suggest several means of setting the size of system parts: Method 1 the demand-side approach (see Appendix A). Method 2 calculating the size of the tank based on elements such as storage capacity, overflow and drainage (the supply-side approach) (see Appendix A). Method 3 computer model (see Appendix A). The methods differ in terms of how sophisticated and how complex they are. Some of them can easily be undertaken by people without specialist knowledge, whereas some need specialists familiar with complicated software. The major elements contributing to the method selected include: the size and the complexity of the system and its parts the availability of the components that are necessary to operate using a specific method (e.g. computers) the required skills and technical knowledge/training among the practitioners/designers. Also, according to the EA (2008), tank size tends to be based upon either the capacity required for 18 days or a 5% share of the annual yield (whichever of the two is lower). This method will be combined with the supply-side method to determine the tank capacity for this project (see Appendix A). 1. Calculating the optimal tank size based upon the predicted rain yield: The EA (2003) formula for working out the best tank capacity for the rainfall harvest setup is as follows: Tank capacity (litres) = Roof area (m2) x drainage factor x filter efficiency x annual rainfall (mm) x 0.05 For the school Optimal tank capacity (litres) = (600* 0.75* 0.9* 573 mm*0.05) + (385*0.5* 0.9* 573 mm*0.05) = 16566.86 litres = 16.57 m3 For the hotel Optimal tank capacity (litres) = (1,200* 0.75* 0.9* 573 mm*0.05) = 23206.5 litres = 23.21 m3 2. Calculating the optimal tank capacity using the idea of holding 18days- worth of demand: Collection tank volume = days storage x average daily demand For the school The à ¢Ã¢â€š ¬Ã‹Å"Estimating water demands for the hotel and school section and the figures in Chapter 3 show that the overall quantity of water used to flush toilets, irrigate soil and clean is 612 m3 per annum for the school building. This exceeds the estimated annual rainfall harvest. This being the case, the RH tank will provide water for flushing toilet, with the tank storage for 18 days equalling: (268 m3/365 days)*(18 days) = 13.22 m3 For the hotel According to the figures in Chapter 3, the overall average water requirement at the hotel is 3000 m3. The quantity used to flush toilets, irrigate soil and clean amounts to roughly 53% of the hotels water requirement: roughly 1590 m2 per annum. This requirement cannot be covered in total by the RH alone. This being the case, the RH will be limited to cleaning and/or irrigating or to flushing toilets. Even within these limitations, there may not be sufficient rainwater for these tasks. Using the average daily requirement for toilet flushing: the tank storage = (3000 x 0.35) m3/365days x 18 = 51.79 m3 Using the average daily requirement for cleaning or irrigating: the tank storage = (3000 x (0.12 + 0.06)) m3/365days x 18 = 26.63 m3 Using the aforementioned EA (2003) data, a smaller size is optimal. This being the case, if the RH is used to flush toilets, the respective tank sizes for the hotel and the school are going to be 23 m3 and 14 m3. If the method of estimation used is the supply-side method (i.e. it is based upon capacity, overflow and drainage (see the tdix A)), the the optimal respective tank sizes for the hotel and the school will be 35 m3recomm3 m3 and 35 m3ing for these figures is represented bycalculations ad A-3 (seein Appendix A)The selection ultimately made may depend on a combination of these methods of calculation, as well as the price of the tankAfter this, th 4.2 Grey water recycling at the school and the hotel Metcalf and Eddy (1991) refer to two kinds of wastewater. These are grey and black wastewater. Black water has been flushed down toilets, passed through the drainage system and on to treatment plants. Black water is contaminated with more pollutants than grey water. Grey water accounts for all of the wastewater which has not been used to flush toilets (EA, 2003). It can be treated and then reused for flushing toilets or irrigating soil (Metcalf and Eddy, 1991). Both Waggett (2004) and the EA (2008) refer to grey water from washing machines, kitchen sinks and dishwashers as black wastewater, as it is heavily contaminated and can contain large amounts of grease and food particles. Figures 3.1 and 3.3 illustrate that the two buildings will produce grey water at the levels of 55% at the hotel and 32% at the school, 32% and al. (2007) nostate thatis typeg is treated usingrequires biologicalnt systems,by followed by sand filters andts, as the water is heavily contaminatedion because of the high levels treatmeused to flush toilets or irrigate soilThis treated water can be used for toilet flushing and grounwash basins were be colltic decreasing would occur. Collecteequires a physting oninfected sandsith disinfection and membranes suct et al, 2006). This treated watd to flushfor toilets flushing. Figure 4.3: Schematic of the grey water recycling system to be installed (Source: Birks et al., 2001) Grey water is of lower quality than harvested rainwater and always needs treatment before it is used; There areinotgenerally recognised official aegulations regarding grey waters standard of cleanliness before it can be reusedtoPidou et al., 2007) and individual nations decide upon their own minimum quality requirements. Fs it stands, the UK has no official regulations regarding wastewater usageUnfy wain ). Waggett (2004) nostates thahis lack of legislation is a limiting factor to grey and rainwater usage.one of the eyd rainf standards have been put forward by a number of organisations, complicating matters for those wishing to make use of these green solutionsThis makes a sufficient specificationt the subject have found that project planners should ideally set up The majority of the studies available conclude that it is best to operat level of of a health risk exists and what forms of water treatment they should make herefore, the level of treatment required. There are some highly d etailed research papdocor the water quality standards for non-potable water re and greywatergrey water) wn in Appendix B. For the project under consideration here, it would probably be best to gather and treat grey water for use in toilet flushingf Figures 3.2 and 3.3 display the grey water percentages from showers, baths and hand basins as being 28% for the hotel and 2% for the schools As the school produces relatively little grey water, it is probably best not to bother recycling it in the case of this building, for cost effectiveness purposesTrn the scrin it. He hotel pr a significant quantity of grey water, which will be worth reusing. According toTherefore, economically only the greywbe ey water is generallyeopriate technology for community buildings such as schools, libraries, places of worship and community centresà ¢Ã¢â€š ¬?. The health risks associated with This is because of the potential concerns wither, parthildren are likely to be presresponsible for this. cleanliness especially where children are exposed to the water and little greywatergrey watinn technology would no ve in the case ft According to Waggett (2004), non-potable (grey or RH) water can be utilised for sub-surface irrigation, as long as no spray mechanisms are involved. à ¢Ã¢â€š ¬Ã…“Direct reuseà ¢Ã¢â€š ¬? is another option in areas like laundries (e.g. reusing water from the final rinse for the next washs first rinse). This application may be included in the hotels design and implemented during construction, though many hotels outsource their clothes cleaning services. recycling shows the methodology for the design of the grey water recycling system. The hotels grey water will provide 80% of its total water requirement for flushing toilets (28% grey water compared to 35% needed for flushing), with potable water or rainwater automatically supplementing the produced rrecyclin collectio only at 2s insufficient tof theile (see Figure 4.1). recycling004) noteshows thatandit is possible wateh be used in one water setup, and while this increases the quantity of water collected from that which could be expected from a simple RH system, it creates a need for a larger tank to store all of the water and for a greater quantity of chemicals with which to treat the water, both of which will be costly for the projectand rainwater in the same watys 5.0 Discussion and quantification of options for water conservation at the development site Braithwaite (2006) posits that all developments that aim to be sustainable need to contribute positively to society, be sympathetic to their local environment and ensure that they are cost effective. These factors are referred to as the pillars of sustainable development (Hunt and Rogers, 2005). This part of the report evaluates the potential methods for decreasing the buildings water requirements in terms of their impact upon the aforementioned pillars of sustainable development. The cost effectiveness of the options If less water is required, then less money will be spent on sewage treatment and savings will also be made in terms of spending on water (Otterpohl, 2006). The savings on water will not necessarily be very large, as UK water prices are not high. The savings made by implementing the green technologies would need to be set against the cost of their implementation in order to work out how long it would take for them to financially justify the expenditure. The necessary predictions of expected usage would be difficult to make, particularly for the school building, which would have very low usage during holiday periods. In the case of the school, grey water would probably not be cost effective (as discussed earlier) and would probably need a very long time to make sufficient savings to cover is not co2003) estimate a 30% saving on water expenditure is needed to justify investment in the reuse of grey water and it is unlikely that this would be achieved at the schoolMoreover, at the se kitchen eyecyclis Grey water would, however, be cost effective in hotels; especially big hotels with en-suite accommodation, as customers would consume large quantities of water systems afihite bathrooms and powerful showers an expected part of modern hotels, water consumption is actually higher in the newer establishments, making recycling of non-potable water even more relevantUnlike the majoritutilise treated grey water for toilet flushing when it is busy and revert to its main supply when there are few customer, in order to avoid keeping the grey water in their tank for extended periods. This is common practice in countries with low rainfallrefore, greywatergrey water is The extra setup required to circulate the treated grey water around the hotel would need significant expenditure from those funding the project and this would have to be given serious thought before deciding whether it would pay off in the long term. Rain harvesting setups are fairly commonplace at UK schools, as the water is considered to be fairly clean and the running costs are not too. With a lot of water used for toilet flushing, there would be a need for a big tank at the school, which could lead to a big saving over. To carry out a similar harvesting operation, the hotel would require both a large harvesting area (on the roof) and sufficient room to keep the tank. This would probably not be workable for most hotels. Establishments with swimming pools might consider harvesting and treating water to use in their pool. Social costs The costs to society of these solutions would take the form of problems with their acceptability and/or their reliability (Hunt et al., 2006) (see Appendix C). Environmental costs Braithwaite (2006) views sustainability and environmental protection as being more or less the same thing, with an emphasis upon ensuring that the construction and the running of the buildings is not damaging to the local area going forward. To ensure this does not happen, evaluation of the likely negative externalities of the technologies put forward is needed. Water sustainability for the project might be measured in terms of factors such as impact on the climate, biological diversity and resource depletion. While all of these factors have an environmental aspect to them, climate effects can also create problems in economic terms as well as problems for society in general (Hunt et al., 2006). The recommended technologies need to be beneficial in terms of future sustainability, with emphasis placed on decreasing both the quantity of water that is wasted and the quantity that is obtained from the mains source. Integrated costs On most projects, planners would tend to opt for familiar solutions that are known to be effective over new ones which they might perceive as inherently risky and this might be a factor in the selection made here, particularly in the case of the school, given consideration of the involvement of children (Hunt et al., 2006). As well as the interests of the planners and developers, it is important perhaps most important to give consideration to how the solutions would impact upon the people ultimately using the facilities being discussed. With no official standards for the condition required of non-potable water before it can be used, careful planning is needed to make certain that no errors are made that could potentially cause harm to customers or students. Hotels often take the precaution of labelling water sources such as sinks that provide non-potable water. Another precaution, which might be made use of at the school, would be to use quality gpes (EA, 2008). Prior to selecting one of the options, the projects planners should assess how efficient they are by looking into both how secure and how durable their supply of water will be (Hunt et al., 2006). With the rainfall system being wholly reliant upon the weather, this is quite an insecure option, as unexpectedly dry weather will significantly harm the effectiveness of the solution. This might put off the planners, particularly in the case of the hotel, with grey water reuse preferred due to its greater regularity of supply, regardless of the changing seasons, climate or weather patterns recyclingal., 2006). Therefore 6.0 Conclusions and recommendations The report posits an approach to setting up a sustainable system for managing water at a brownfield development site where a hotel and a school are being constructed. The buildings water requirements are approximated from information provided from the exercise paper and CIRIA report no. C657. The report also considers two alternatives for green technologies to help ensure that the buildings have a sustainable water supply, namely the harvesting of rainfall and the reuse of grey water from the buildings recyclinglutions would both provide non-potable water, with the rainwater of a higher standard than the grey water, which would require treatment before it could be reintroduced to the water system, even for uses not involving human ingestion supplied from thes or regulations regarding RH or grey water quality in the United Kingdom, it would be best to utilise the water for functions such as sub-surface irrigation or flushingAs there are not agreed wateould provide sufficient water to fully supply these functions, but could still significantly supplement the water provided by the mains supplyIn addition, that all these uses can not be fully coven to analyse poteo, there iscription in order to identify the methods of qurnservation at the school and the hotel, ultimately recommending that. water produced by grey water treatment and RH should be utilised for toilet flushing, so as to make savings on water costs and sewage fees. the RH setup is better suited to the school in terms of sustainability, cost effectiveness and viability than the grey water reuse setup and should be implemented at the school with no grey water treatment operation introduced. grey water and RH setups should be implemented for the hotel, either in a combined system or separately, so as to make savings and improve the hotels water sustainability by supplying the establishments toilet flushing function. water costs and sewage fees are fairly cheap, whereas the costs of implementing either of the suggested green solutions are significantly higher, meaning that these technologies are not commonplace in the UK recyclingthe current situation, population growth and environmental changes are likely to create greater water scarcity and make these approaches to the provision of non-potable water far more common, with governments legislating in their support. However, the growi there is a need for the EA, the government or another relevant organisation to set up official regulations for non-potable water quality in the UK.