Control Of Sulphur Dioxide Environmental Sciences Essay

Control Of Sulphur Dioxide Environmental Sciences Essay SO2 is an kind of industry air pollution mostly from oil and coal consumption , industry activities and traffics.According to research of EAP(U.S. Environmental Protection Agency) more than 100 million tons sulphur dioxide is discharged into the atmosphere every year all over the world.In the nature,most of the sulphur emissions are in the H2S(hydrogen sulphide),CS2(carbon disulphide),COS(carbonyl sulphide) and some organic compouds.Through burning,these organics which contain sulphur element discharge the sulphur dioxide to the atmosphere,which is able to lead serious environmental problem and harm humans health.SO2 pollution may cause plants dead in a extremely high speed,and is dissolved easily into the wind,which may cause the acid rain that may distroy the outdoor buildings.The most importantly,high concentrated SO2 in the atmosphere is able to kill people or cause serious ills including bronchitis, emphysema and oculoglandular conjunctivitis.Moreover,the sulfuric acid,is a seco ndary pollutant.When sulphur dioxide is involved in additional chemical reactions,it can react with oxygen and water to sulfuric acid which is the constituent of acid rain.(NATHANSON,J.(1986)) Generally,to solve the serious environmental problem,there are two research torwards in removing sulphur dioxide:pretreatment and afterwards absorbing. No matter what methods people use were all included in such two research directions. Pretreatment means separate the sulfur element from the coal mineral before it was burned. Because the main organises of sulfur element in coal are FeS2 and organic sulfur, generally, in industry people often use independent ways to do separation. For the inorganic sulfur including FeS2, the most traditional way is gravitational segregation which means separate the ore containing sulfur element from the coal with the differences in density. Such method is extremely financial and technical simple, however its effects sometimes are limited. Because of the differentia of the coal ore all over the world, the strainaway rate of the sulfur element is highly different. In some area the gravitational segregation can remove approximately 90% of the sulfur element in coal ore, while in some certain coal mines of 40% of the total sulfur content can be wiped off. For the organic sulfur element, it seems that there is not a efffective pretreatment approach to solve it. What people can do is just absorb the SO2 from burning organic sulfocompound. Unfortunately, because of the complicated organization of organic matter, generally, the sulfur contained in the coal ore would be burned in to a series of sulfocompounds including H2S,CS2,SO,SO2 instead of only SO2.So before people assimilate the SO2, people have to transform these compounds into SO2 first. Nowdays the most common way is fluidized bed. Fludized bed is a kind of organization for gasification of coal which is created by Fritz Winkler of Germany on December 16, 1921. Since the early 1960s, Douglas Elliott put forward that the coal should be burned instead of gasifying coal in a bubbling fluidized bed, because the it can generate steam by immersing boiler tubes. In 1982, the first CFB boiler which can burn low-grade coal was built in the Vereingte Aluminum Werke at Luenen, Germany in 1982 which is designed exclusively for the supply of steam and heat. The general gas-solid fluidizetion has 5 major application: Energy conversion, Petro-chemical processing, Mineral processing, Chemical and pharmaceutical and Physical processing, and the basic one is energy conversion. FIGURE 1.2 Schematic of a high temperature fluidized bed gasifier In general coal would be fed into bubbling fludized bed at 950 degree. Steam would be fed into the base of the fluidized bed through a sparge pipe-type of distributor. Then the coal would leave the hot solids in the bed and the cleaned and used gasification products leave the bed from the top. In this process limestone (CaCO3) and dolomite (CaCO3Â ·MgCO3) would be mixed with the coal ores to abstract the SO2 from the burning.The chemical equation is as follow: (1.1) After the fluidized bed step, there is still approximately 20% SO2 left in the offgas. To solve this SO2, people need some technologies including Calcium-Based Reactions and Sodium-Based Reactions, which were called afterburning absorbing. Until now, there is not a cheap and effective approach.The effective methods usually are expensive and lay a heavy burdon on finance,at the same time ,the cheap ones disable to remove the sulphur dioxide satisfactorily. The major information of this paper includes the benefits and defects of the traditional ways controlling the SO2, the rational of the new aspect: magnetic method, the problems may meet and the solutions of this approach..The ultimate purpose of the assignment is to point out a solution both financial and efficient.All the experiments and theories mentioned in this essay are based on theories and logical deductions. Analysis Advantages Nowdays in technology aspect people are able to control the SO2 letting effectively, after all the steps the SO2 discharged into the atmosphere is less then 1%. Materials of these technologies are all hackneved,. Moreover, some certain technologies can produce a series of cost efficient second products such as vitrol and compound fertilizers. Pretreatment is best method to control the sulfur dioxide, personally. Not only because the FeS2 can be separated from the coal ore easily, but also FeS2 can be another useful materials in industry. Because of the characters of coal mines, the associate ore of coal is FeS2 generally. As a result the FeS2 ore occupies a big part of coal mines in anywhere of the world, and the FeS2 ore is the most common material of puddling. So the pretreatment is a both efficient and financial approach. Fluidized bed is the second steps of the whole sulfur dioxide, the absobents of fluidized bed are very cheap and common. So this technology resently is used widly in the countries which are occupying a roomy area such as China and American as a normal skill. And such technology is extraordinary suit for the large-scale factories. Afterburning absorbing is the most efficient way to control the sulfur dioxide discharging regardless of the concentration. The ultimate consistence of SO2 in off gas which is disposed by the afterburning absorbing usually is less than 5%. In summary, the technologys resent used in the SO2 control are highly mature, however there are still some disadvantages can not be ignored. Disadvantages Although pretreatment is the most efficient and financial method to control the sulfur dioxide, it has the deadliest defect: the restriction of area. Because of the difference of the organization of coal ore in different area, such technology disables to be spreaded. For the fluidized bed the problems are secondary products and the processing ratio.When the chalks go into the boiler the active principle, CaCO3 would be resolve into CaO and CO2. The burned CO2 would sepatate out and enlarge the interspace on the CaO to form the lacunose CaO which can response with the SO2 easily. However it is impossible to make all of the CaO be the CaSO4, because the sulphating would make the interspace fullfilled by CaSO4. As a result the most chalks would not response with the SO2 and a great deal of chalks are wasted. Moreover, the secondary products are the mixture of CaSO4, CaO and CaCO3, so that the only way to manage them is dumping which may cause the salinized land. Afterburning absorbing is an efficient approach including wet limestone, wet soda ash/caustic lime spray dryer, circulating lime reactor and sodium bicarbonate/trona injection to control the SO2,however, it also has irrefusable disadvantages: the finance. After the advanced two step there is a lot of SO2 in the offgas, most of which is CO2, so that afterburning absorbing usually is extremely expensive. Moreover such technology has a great deal of problems such as the corrosion on equipments, pipeline blocking and the lack of material use ratio. Discussion Rationale Personally, the basic method to control the sulfur dioxide from the coal, is to separate the sulfur element from the coal ore before burning. In other words, to forbide the shaping of sulfur dioxide is the best way to control it .This kind of ideas is not impossible. If we can make most of the sulfur element separated from the coal before burned into sulfur dioxide, we do not need the afterburn aborbing. Personally people should use another aspect to think about the coal burning. The coal ore is consist of FeS2, ash content and organic organizations. After the pretreatment, almost all of the FeS2 would be remove out of the coal ore, so most of the substance left is organics and ash content. In the fluidized bed, the coal would be transfor into gas, the majority of which is CO2 and sulfide gas. Fortunately the CO2 molecule organizationis nonpolar, and the most of sulfide gas is polar molecule, such as SO2. As we know gaseous phase and solid phase do not have the material difference, nowdays the magnetic force is used widely in the solid waste control. So it is possible that use the magnetic force in separating two kinds of gas which have differences in magnetism. Problems may meet and solution The biggest problem people may meet is the differences between CO2 and sulfur dioxide are too small. This kind of force is only a little bigger than VDW(Van der Waals force), it is impossible to separate all of the CO2 and sulfide gas completely. The method to solve this problem actually is very easy, which is magnify the differences of force suffered. As we know, at the same temperature and pession, the density of SO2 is bigger than that of CO2, that means the climbing velocity of CO2 is bigger than SO2. All the factories need chimneys which are used to let the off gas to upper atmosphere to forbid the impact on daily life. If we add a magnetic field at the bottom of the chimney, it is sure that CO2 would climb up much faster than SO2. That means we can magnify the differences of suffered force between SO2 and CO2. The second problem of this opinion is how to gather the SO2. In my way, it is still to use the magnetic force. The chimney in my plan is not simple one, it should the a concentric tube. There would be a lot of interspace all over the inside tube, which is used to separate the SO2 from the off gas. In the whole chimney, there would be a magnetic field, so that SO2 in the off gas would suffer the magnetic force which is able to make the SO2 run over the inside tube. The outside tube is obfurage, so that SO2 would not be discharged into the atmosphere. The last problem is finance. It seems that the technologies and skills used nowdays play a better role in financial problems than the method mentioned above due to the high cost of basic built and daily power consumption. Although I can not submit the compellent datas about the basic built and daily consumption, I strongly believe that it performs better on the finance than the technologies and skills used now. Most skills of afterburning absorb would consume 15% electronic of the total vield for power plant. That means only 85% power is useful. On the other hand the power consumed in establishing magnetic field is obviously much less. All the power plants in the world would have chimneys, so the basic building cost would not be unacceptable. Furthurmore the secondary product: sulfur dioxide is the resource of manufacturing vitriol. In my opinion, the consumption in power even would be less than the money earned from the secondary product. Advantages and disadvantages In comparison of any other technologies and skills, the ultimate advantage of magnetic force is no secondary pollution. No matter what kind of skills used now have the problem of secondary pollution, such as the mixture of CaCO3 and CaSO4. These substances can not be recycled and do not have financial values, the simple managements such as landfill may cause the salinization and soil erosion. On the other side the secondary products of the magnetic method is the mixture of SO2 and CO2. This mixture is able to react with O2 under the catalysis of V2O5 to produce vitriol which can be the chemical engineering material. Furthurmore, this approach is extremely suitable for the Third World Countries. As we know, because of the financial problems the environmental problems in the Third World Countries usually are usually negelected. Controlling the sulfur dioxide is a heavy burdon on the companies and coutries of the Third World. If they can gain economic benefits from controlling SO2, it i s obvious that there would not be any problems on the popularize in the Third World countries. However, it also has some problems the most evident one is the problem of strainaway rate. Due to the restriction of circumstance, I can not do any experiment until now, so nobody knows how much the strainaway rate is. The most urgent and effective solution is doing experiments. Any valuable and successful technologies and skills are based on doing a mass of experiment to find problems and change the process. Moreover it seems that to reach the target mentioned above, there would be a simple but endless process, that means it is only suitable to the sweeping factories. Conclusion In conclusion, the way that author put forward obviously is a new aspect to regard the control of sulfur dioxide. After more than 100 years research on the traditional methods, they are all extremely ripe and difficult to improve. The magenic approach has the innate superiorities in comparision of the traditional ways. It is a definit physical technology which means there would not be any new extra pllutant to harm the environment. Moreover compared with the other new methods researched now, it is incredible convinient. All the basic building can be remaked from the existing equipments such as chimney and fluidized bed. In developing countries such as China and Africa countries which are not willing to pay attention on the environmenal protection, this technology can improve their enthusiasm, because they can gain a high economical benefits from the secondary products: vitrial with only a little investment. Although there are still some undeniable problems on this magenic way, it mus t be a valuable toward to research. The method mentioned in this paper is based on the 4 years experience in studying environmental subject of the author. Although the perspective and theoretical knowledge are sometimes naive and idealize, I strongly believe that this method must be valuable. Not only because the method itself, but also the aspect to deliberate and research. Environmental science is a wide ranged major which is not restricted in chemistry or biology, but also physics, physical chemistry, manage and biochemistry. The workers of protecting environment should expanse their own field of vision to all the relational knowledge instead of the major itself. In this career, not matter the organizations and physical properties, not matter the fields people consentrate on, as environment protection workers, we can all learn a lot of things and acquire inspiration from the whole science and engineering region.

Ethics and Research in Professional Contexts

Introduction Ethics play a pivotal role in a variety of contexts, such as decisions in personal contexts (e.g. family, friends) and professional contexts (e.g. workplace). This essay considers the role of ethics in the case study of a woman’s decision to have an abortion. Drawing on and synthesising work from philosophy, law and current medical practice, the essay will discuss ethical issues on abortion from three different viewpoints. These viewpoints will be reviewed and discussed in order to reach a conclusion. Case study Mrs K is a 37-year-old woman and has four children. She consults her doctor for irregular periods. She had been using a diaphragm as contraception after having stopped taking birth control pills because of their negative side effects. Her doctor informs her that she is pregnant. She does not want another child. She breaks down and says she already has as many children that she can cope with. Mrs K also suffers from depression. Her doctor considers her circumstances that fall within the Abortion Act 1967 and refers her to a clinic. However, her husband (Mr K) disagrees with the abortion. This essay will investigate ethical issues central to this case study. Ethical issues arise from situations in which there is no satisfactory solution that can be applied to an ethical dilemma. Opposing courses of action may seem equally desirable or all possible solutions may seem undesirable. In the aforementioned case study, the ethical dilemma addresses two opposing views on abortion and discusses whether it is the right decision given the circumstances. This essay will explore this ethical dilemma by outlining three different viewpoints and discussing whether each viewpoint is justified. Discussion There are three key individuals involved in this case study: Mrs. K, Mr. K and the doctor. Mrs K. is at the centre of the dilemma as she wishes to have the abortion, Mr K. is Mrs K’s husband and disagrees with the idea of abortion, and the doctor assesses and guides Mrs K’s decisions. Mrs K Prior to assessing Mrs K’s viewpoint, it is important to outline her circumstances. Mrs K had been on contraception because she was very clear that would not be able to cope with the responsibility of having one more child. However, her contraception failed and the doctor notified Mrs K that she was indeed pregnant, prompting her to take a decision on having an abortion. Firstly, under the philosophical principles of Utilitarianism, it may be argued that Mrs K is justified in taking the decision to have an abortion for a number of reasons. Utilitarianism was first conceived by Jeremy Bentham (1748-1832), and was later developed by John Stuart Mill (1806-73) in the middle of the Industrial Revolution. Mill established the â€Å"greatest happiness principle† which posits that actions are right when they promote happiness, and wrong when they produce the opposite (Tschudin, 1994). According to Mill’s principle, with regard to people’s own lives and bodies, pe ople can do whatever we want, so long as others are not harmed (Feiser, 2009). In other words, each individual has the ability to choose what they feel is moral or immoral. In fact, virtue ethics does not hand out specific rules of behaviour that need to be adhered to but instead develops characteristics that help individuals decide on moral decisions, e.g. whether or not to have an abortion. Virtue ethics does not see abortion as right or wrong as it depends fundamentally on a person’s character. In accordance with this theorising, Mrs K’s decision to have an abortion is justified as it is an action that that involves her own life and her own body and therefore, rests on her decision. Secondly, in Utilitarianism, â€Å"Act Utility† states that the greatest good is that which brings most happiness and least pain (Feiser, 2009). Using a â€Å"Hedonic Calculus†, individuals can calculate which decision produces the greatest balance of good over evil and the refore, apply this reasoning to individual dilemmas (Bentham, 1789). With this Act Utilitarianism in mind, Mrs. K’s decision to have an abortion can be seen as the right decision as having a child would cause her unhappiness and pain in the future, as well as be a huge risk in exacerbating her existing depression and anxiety. Additionally, bringing a baby into a home of four children would take away time and attention from her other children which could be potentially traumatic for them and impede their development. Therefore, if Mrs K were to use a hedonic calculus, an abortion would certainly amount to the right decision as it maximises the quality of her well-being and that of her children.A third argument in favour of Mrs K’s decision is the fact that as an autonomous human being, Mrs K has to right to make decisions about her own life and body without coercion by others (Beauchamp & Childress, 2001). Although researchers have suggested that autonomy is not a †˜univocal concept’ (Beauchamp and Childress, 2001), in the context of respect for reproductive choice, it does have a specific meaning. At a minimum, autonomy affords respect to an individual when making certain choices and taking actions based upon their personal values and beliefs. If a pregnant woman is forced, against her will, to endure nine months of physical, psychological and emotional turmoil, it is difficult to describe her as an autonomous individual. This argument also draws on philosophical principles on free will. That is, free will considers humans as agents who have the ability to make their own choices freely (Caruso, 2012). Therefore, in the case of Mrs K, it can be argued that as a free agent, she should have the final say in her actions and decisions that includes her pregnancy. If she chooses to end her unwanted pregnancy for her own reasons, then she has the right (and the free will) to do so. This reasoning is in fact, reflected in the Universal Declar ation of Human Rights Act (1948) article 1, ‘all human beings are born free and equal in dignity and rights’ (Williams, 1981) that establishes human rights as inherent to every human being. However, it must be noted that this article may also be used as an argument against an abortion if a foetus is considered to be a human being, and therefore having its own individual right to life. Many anti-abortion supporters (i.e. pro-life) do indeed support this argument and highlight that an unborn child is an innocent human being and abortion is therefore wrong. However, pro-choice supporters have retorted this position by upholding the concept of â€Å"personhood†. In other words, supporters argue that a foetus does not meet the criteria of personhood and therefore does not have a right to life. This position is echoed in philosophy by Mary Ann Warren who outlines a set of criteria for personhood that include: 1) consciousness of objects and events external and interna l, 2) reasoning, 3) self-motivated activity, 4) a capacity to communicate, 5) the presence of a self-concept (Warren, 1996). By these criteria, it is clear that foetuses, although they have the ability to eventually meet these criteria, would not have a right to life until they are born. Similarly, Peter Singer posits that only a moral agent is capable of having their rights violated, and as the foetus is not a moral agent, it cannot have its rights violated (Singer, 1995). In other words, as a foetus cannot make moral judgements of what is right or wrong, it does not have the same rights as human beings. Although both Warren and Singer propose controversial ideas, the arguments of personhood and moral agency adds further justification to Mrs K’s decision to have an abortion. Mr K In the case study, whilst Mrs K has decided to have an abortion, her husband is against it. From his perspective, he has always wanted a large family and therefore, feels very strongly against an abortion. Given his views, Mrs K’s decision to have an abortion could lead to considerable anger and resentment in her husband which could manifest in marital discord and eventually divorce, all of which would be extremely harmful for their children. Returning to the hedonic calculus, it is therefore important to take into account these potential consequences as they may outweigh the reasons for having an abortion in terms of the happiness of Mrs K and her children. However, at the same time, if Mrs K chose not to have an abortion because of her husband’s views, this could lead to considerable anger and resentment in her and increase her depression and anxiety, which could all negatively impact her children’s welfare. The decision is therefore not clear-cut.A second reas on that Mr K does not agree with the abortion is because of his own religious views. He believes that human pregnancy happens for a divine reason and that man and woman both create a baby and therefore should have an equal say in what happens to that baby. From the Roman Catholic view, the wrongness of abortion is rooted in the Natural Law view that innocent life (i.e. from conception) must be preserved (Hunanae Vitae, 1965). However, it must be noted that in 1993, the Church of England produced â€Å"Abortion and the Church†. In this document, abortion is described as a great moral evil but can be allowed in circumstances in which the foetus endangers the life of the mother or if there is severe foetal disability. Whilst having a baby does not physically endanger Mrs K’s life, it can be argued that it endangers her mental life given her depression and anxiety, thereby, justifying an abortion. Moreover, it is important to note that legally, Mr K has no right to demand or refuse a termination under the Abortion Act (1967) & Human Rights Act (1998) that place the entire responsibility to the woman. Doctor Health care professionals have a number of responsibilities such as a duty of care to provide women with all the information they need in order to make an informed choice about how to cope with their unplanned pregnancy. The doctor in this case study had the responsibility of making an assessment. Specifically, the doctor must assess the potential impact of pregnancy and birth on Mrs K’s physical and mental health. In fact, the Abortion Act 1967, as amended by the Human Fertilisation and Embryology Act 1990 (House of Commons, 2006), clearly says that a registered medical practitioner has the power to lawfully terminate a pregnancy. However, it is difficult to apply blanket rules when dealing with considerably sensitive and difficult decisions, which require a deeper understanding of a woman’s individual needs and desires. Given the difficulties shrouding a pregnancy termination, doctors play an important role in ensuring that a patient always feels supported. Doctors ar e also responsible for giving appropriate information and counselling about all the options available to patients (BMA, accessed 10/01/13).In this case study, Mrs K strongly felt that having an abortion would be the best decision and her doctor should therefore be able to respect her decision. Her doctor should act as a guide and act in the best interest of Mrs K (Pfeffer, 2002). The 1967 Abortion Act also refers to a doctor’s â€Å"rights to follow the dictates of their own conscience† (Pfeffer, 2002). The Doctor therefore, obviously considered Mrs K’s depression and mental capacity and found it suitable to refer her to a clinic. The doctor also was able to see that Mrs K was mentally fit to understand the procedure and its alternatives (BMA, accessed 10/01/13). Conclusion There is no doubt that abortion is a controversial and hotly debated topic in a variety of academic and professional spheres, and different viewpoints are infused with biological, moral and societal complexity. It is clear that there are numerous positions that people can adopt such as a Utilitarian point of view, a religious perspective, or a personal view when seeing an action as moral or immoral. In this particular case study, given Mrs K’s depression, her current family situation and her strong wishes to have an abortion, I believe that her decision is the right one. As a woman, Mrs K has a right to make her own choices and lead her own life in equality with, not under the control of her husband. Moreover, the fact that Mrs K has become pregnant as a result of a contraceptive failure strengthens her decision, as her pregnancy did not come about from carelessness, but from forces outside of Mrs K’s control. References Bentham, J. (1789). An Introduction to the Principles of Morals and Legislation. London. Beachamp, T. L., & Childress, J. F. (2001). Principles of Biomedical Ethics (5th Edition). Oxford University Press. British Medical Association, The law and ethics of abortion. Accessed 10/01/13 from: www.bma.org.uk/-/media/Files/PDFs/†¦/Ethics/lawethicsabortionnov07.pdf Caruso, G. D. (2012). Free Will and Consciousness: A Determinist Account of the Illusion of Free Will. Lexington Books. Fieser, J. (2009). Ethics. Internet Encyclopedia of Philosophy. Accessed 10/01/13 from http://www.iep.utm.edu/ethics/ House of Commons: Science and Technology Committee. Scientific Developments Relating to the Abortion Act 1967. (Volume 1). Accessed 10/01/13 from: http://www.publications.parliament.uk/pa/cm200607/cmselect/cmsctech/1045/1045i.pdf Humanae Vitae: Encyclical Letter of His Holiness Pope Paul VI, on the regulation of Births (1965). Pfeffer, N. (2002) ‘Fertility counts: from equity to outcome’ in S. Sturdy (ed.), Medicine, Health and the public sphere in Britain, 1600-2000 (pp. 260-278). Routledge. Singer, P. (1995). Animal Liberation (2nd Edition). Pimlico. Tschudin, V. (1994). Deciding Ethically: A Practical Approach to Nursing Challenges. London: Bailliere Tindall. Warren, M. A. â€Å"On the Moral and Legal Status of Abortion† in T.A. Mappes and D. DeGrazia, (Eds.), Biomedical Ethics (1996), New York, McGraw-Hill, Inc, pp. 434-440. Williams, P. (1981). United Nations. General Assembly. The International bill of human rights. Entwhistle Books.

United States And Foreign Policy - 2415 Words

United States (US) interference of foreign policy is a complex and much debated issue in the United States. The major topics to be evaluated include the benefits and costs in the areas of national security, humanitarian causes, trade, alliance, and economic impacts. Additional concerns involve the loss of human life and the animosity generated toward the US when the country decides to provide aid to another. US interference can have positive and negative effects if acted upon by interceding in foreign affairs. The United States should not be allowed to intercede in foreign affairs unless the US is trying to promote and preserve peace. US interference consists of preserving national security, promoting world peace and a secure global environment, maintaining a balance of power among nations, working with allies to solve international problems, promoting democratic values and human rights, and furthering cooperative foreign trade and global involvement in international trade organiz ations (ushistory, 2013). One way the United States can secure the national security is by protecting the borders from terrorists, instead of spending money for foreign wars. The US should invest money to secure the border. Securing the border would require fewer troops and would utilize unmanned surveillance technology called the Predator B drone, which costs $3,234 per hour to operate (Isacson, 2014). 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