Impact of nitrogen and phosphorous inputs on water quality Essay Example for Free

Impact of nitrogen and phosphorous inputs on water quality Essay Both Nitrogen and Phosphorous are necessary in agriculture for a farmer to achieve optimum yields in most crops, they have to use fertilizer which often contains either nitrogen or phosphorous. Despite their importance, these elements in excess can affect the environment adversely. Eutrophication is enhanced when nitrogen and phosphorous are in excess in surface waters and where nitrogen is in excess in ground water. (www. soil. ncsu. edu/) Nitrogen makes up about 78 percent of the gases in the atmosphere. A major constituent of proteins it is abundant in most living things. Nitrogen gas (N2), nitrate (NO3), nitrite (NO2) and ammonia NH3 are the common forms in which in organic nitrogen exists. Organic nitrogen exists in proteins. (http://kywater. org/). Compounds that contain nitrogen are found in water bodies such as reservoirs, streams and rivers. There are various routes by which nitrogen enters water bodies. These include wastewater (municipal and industrial), animal wastes such as bird wastes and wastes of fish, septic tanks and runoff from fields and lawns that have been fertilized. In certain parts of the United States, especially the northeast, some forms of nitrogen are deposited through acid rain (Baird, 1990). Nitrites are then converted to nitrates by bacteria, a process that uses up oxygen. (http://kywater. org). Surface and subsurface drainage are some of the ways through which nitrogen from fertilizers enter streams. When there is heavy rainfall following surface application of nitrogen fertilizers, most of the nitrogen is lost and even more is lost if the area is sloppy. When the fertilizer is mixed with soil the runoff is decreased. However, the loss of nitrogen becomes substantial when heavy rainfall causes soil erosion and movement of debris. The highly soluble nature of nitrogen makes it be absorbed easily into the soil when it rains heavily. Findings from research studies show that leaching does contribute to the presence of nitrates in groundwater. This however does not cause much contamination since the concentrations of nitrogen do not reach high enough levels. The crop uses up to 50 percent of the applied nitrogen leaving about 30 percent to 50 percent available for leaching. This, from a study done on North Carolina soils leads to leaching to a level of only two feet where there was 3 inches of percolated water (Baird, 1990). Eutrophication is a slow process whereby streams and lakes are enriched with natural nutrients. This process leads to the accelerated ‘aging’ of lakes and reservoirs. Eutrophication generally means excess growth of algae. The growth and decomposition of algae causes depletion of oxygen available in water. Nitrogen has a fertilizing effect in algae and other plankton which are food to other organisms in water such as fish and invertebrates. Overproduction and decomposition of these plankton uses up oxygen, meaning that other oxygen-dependent animals have inadequate oxygen which leads to their death. (http://kywater. org/). In addition to using up oxygen excessively, the overgrowth of algae and other plankton can lead to clogging up of water systems such that water flow is inhibited. This is especially common at points of water intakes. A lot of sea plants also block light from reaching the deeper waters (http://ga. water. usgs. gov/). This has the effect of compromising respiration for aquatic invertebrates and fish, making the death of animals and plant inevitable. High concentrations of nitrites produce a condition called brown blood disease which is fatal to fish. (http://kywater. org/). Eventually diversity of animal and plant life is lost. The death of fish results in offensive odours, and affects the water such that it cannot be used for recreative purposes like swimming, boating and fishing. Mueller and Helsel conducted a study of 12,000 ground water samples and approximately 22,000 samples of surface water at over 300 sites. The samples were collected within NAWQA study units. They report that the concentrations of nutrients in water have a close relationship to how land is used upstream or in the area that overlies a ground water aquifer. According to the analysis there were higher concentrations of nitrates in groundwater than surface water bodies. The regions with the highest concentration were the Northeast, the Great Plains and areas along the West Coast (Mueller and Helsel, 1996). Agricultural areas have a higher likelihood of having water with increased concentrations of nitrates. Research shows that public-supply wells and domestic supply wells outside areas where land is used for agriculture generally have lower concentrations of nitrates compared to wells in agricultural areas. On the other hand, urban areas have higher concentrations of Ammonia and phosphorous in surface water (Mueller and Helsel, 196). For water to be considered safe for domestic water supply, nitrates or nitrite level should be below 10mg/L. (United States Public Health Service). Nitrites undergo a direct reaction with haemoglobin in humans and warm-blooded animals leading to the formation of methemoglobin. This compound leads to decreased ability of red cells to transport oxygen. The most affected by this inability are infants less than three months because the babies develop methemoglobinaemia (blue baby disease. (http://kywater. org/ww/ramp/rmnox. htm). Due to this reason, when nitrates levels exceed 1. 0mg/L, the water should not be used to feed babies. In older people high nitrate levels cause disturbances in the digestion system. (http://kywater. org/). Phosphorous is a naturally occurring element that can be found in rocks and mineral deposits. Phosphate ions are soluble in water and are released when rock undergoes the weathering process. Phosphates have three forms of existence, metaphosphate, orthophosphate and organic phosphate. Orthophosphate is mainly produced by natural processed but there are man-made sources that produce orthophosphate. These include untreated sewage and partially treated sewage, use of certain fertilizers and runoff from sites where the main land use is agriculture. Metaphosphate or polyphosphate are used in treatment of detergents and boiler waters. When in water metaphosphate changes to orthophosphate and it can be used up by plants in this form. Organic phosphate occurs tied to organic material like plant tissue or waste solids. When decomposition occurs organic phosphate is converted to orthophosphate (www. water-research. net/phosphate. htm). Phosphorous is necessary for animal and plant growth and acts as a growth limiting nutrient in lake ecosystems. Well-oxygenated waters have low amounts of phosphates. Phosphate undergoes a complex process of uptake and mineralization to be retained in the soil, unlike the nitrogen cycle which is simpler. Soluble phosphate is incorporated by plants and animals in their biological systems to form compounds like ATP, DNA and RNA. ATP is necessary for energy production via the Kreb’s cycle while DNA and RNA have genetic importance. Phosphorous is therefore necessary for photosynthesis to occur (www. water-research. net/) Phosphates enhance growth of aquatic plants which are the food source for other organisms. Increased production of plankton result in an initial increase in population of fish and the entire biological system of the water body. This however has an adverse effect because as the phosphate levels build-up the process by which the water ecosystem is aging is speeded up leading to an imbalance of nutrients where production begins to exceed consumption. Phosphates like nitrates also cause eutrophication resulting in more plants than can be consumed by the system. The result is anoxic waters, presence of algal blooms that are toxic and a reduction in biodiversity as well as destruction of food supply and habitat. (www. water-research. net) Eutrophication is an issue that compromises water quality and has received much attention since 1980 when there was extensive occurrence of blue-green algae in fresh water systems. These blue-green algae (cyanobacteria) sometimes produce toxins that cause harm to human beings and farm animals. Poor conditions resulting from eutrophication have been noted in eastern North Carolina in the Chowan, Neuse and Pamlico River systems (Baird, 1990). Water that has very high levels of phosphates causes digestive problems to people. The negative effect of high levels of phosphate then is more indirect to humans but has a bigger impact because by altering the environment and destroying habitats the destruction caused is much harder to reverse. A compound like nitrates dissolves in water and moves in water in surface streams and ground water. Most forms of phosphorous, however, are transported together with soil that has undergone erosion especially when runoff is high flowing precipitation and irrigation. This is because instead of dissolving they attach themselves to soil particles. As such phosphorous is more likely to contaminate surface water rather than ground water (USGS, Circular1225, 2007). Findings from a USGS report indicate that phosphorous has a greater effect in causing eutrophication with 0.1mg/L of phosphorous being sufficient to cause excessive growth of aquatic plants (USGS, Circular 1225, 2007). In urban areas, the most significant point sources are urban streams which have discharged from wastewater treatment plants. A report of the US Geological service indicates that the streams in the semiarid western and south-western cities coupled with those in urban areas on the East had high levels of phosphorous (USGS, Circular1225). Recent research shows that phosphorous can travel with ground-water flows. The study was conducted in Cape Cod, Massachusetts where there has been contamination of the groundwater with phosphorous, an unlikely thing since most scientists generally believe that phosphorous is not transferable via groundwater (McCob et al, 2003; Stollenwerk, 1996). The main factors influencing vulnerability to contamination are the type of soils and slope of land. These two factors determine how fast and how much runoff there will be. Areas with steep slopes, poorly drained clay soils and little vegetation have higher likelihood of contamination of their surface waters. In urban centres, pavements and drains made of tile cause acceleration of flow of streams. Ground water on the other hand has a high chance of contamination if the soils drain well and the subsurface material is highly permeable. Some practices of crop-management designed to decrease sediment flow may increase infiltration leading to greater contamination of groundwater (USGS, Circular, 1225). To reduce the impact of phosphorous and nitrogen in water quality, strategies need to be employed that reduce the use of chemicals and alter transportation of the hydrologic system (USGS). In planning these strategies consideration of watersheds, patterns of land use and the differences in vulnerability to contamination in various areas should be foremost to ensure that whatever interventions are put in place are effective. References Baird J (1990) Nitrogen management and water quality retrieved from www. soil. ncsu. edu/publications/soilfacts/AG-439-02 Harvard, Olson and Cooke, 1999, Impact of soil phosphorous loading on Water Quality in Alberta, Alberta Agriculture, Food and Rural Development. McCob T D, Leblanc DR, Watter DA, Hess KN Kent DB and Smith RL 2003, Phosphorous in a Ground-water contaminant Plume Discharging to Ashumet Pond, Cape Cod, Massachusetts, 1999: US Geological Survey Water-Resources Investigations Report 02-4306, 70p Mueller D K and Helser D R, Nutrients in the Nation’s water-Too much of a Good Thing? National Water-Quality Assessment Program USGS, retrieved from http://water. usgs. gov/nawqa/CIRC-1136. html National findings and their implications for water policies and strategies, USGS, Circular 1225, retrieved from http://pubs.usgs. gov/circ/circ1225/html/nawqafind. htm/. Nitrogen and water quality retrieved from http://kywater. org/ww/ramp/rmnox-htm Stollenwerk K-G 1996, Simulation of phosphate transport in sewage-contaminated groundwater, Cape Cod, Massachusetts, Applied Geochemistry, V. 11. no 1-2 pp 317-324 The effects of urbanization and agriculture on water quality: Nitrogen retrieved from http://ga. water. usgs. gov/edu/urbannitrogen. html Total phosphorous and Phosphate impact in surface waters Wilkes University, Environmental. Engineering and Earth Science retrieved from www.water. research. net/phosphate. htm Water-quality patterns in agricultural areas, USGS, Circular 1225 retrieved from http://pubs. usgs. gov/circ/circ1225/html/wq-agri. htm/ Water-quality patterns in urban areas, United States Geological Society, retrieved from http://pubs. usgs. gov/circ/circ1225/html/wq-urban. htm/ Water-quality patterns in areas with mixed hand use and a range of hydrologic and environmental settings, USGS, Circular 1225 retrieved from http://pubs. usgs. gov/circ/circ1225/html/wq-hydro. htm/.

Internet Taxation :: Government Political Essays

Internet Taxation â€Å"Should We Tax the Internet?† was written in response to the recent findings of the Advisory Commission on Electronic Commerce in the May 2000 issue of The American Spectator. The argument is between the liberals and conservatives on the issue of whether or not to tax Internet purchases. The liberals believe that Internet purchases should be taxed so that state and local tax bases are not eroded because of increasing Internet purchases. On the other end the conservatives believe that Internet purchases should be kept tax-free, since tracking sales are completed and several states are involved with each purchase. George Gilder the author of â€Å"Should We Tax the Internet?† is extremely conservative in his views and is against all taxes. The article aims to convince its readers that Internet taxation is unlawful and should not implemented because of past tax increases results. To make Gilder’s arguments he uses logos arguments based on facts and reasons. Gilder implements his arguments into his article by relating the arguments to different peoples views and things. Gilder’s main argument is that â€Å"lower tax rates generate more revenue than higher ones† (Gilder 3). Through Gilder’s use of logos arguments, ethos arguments, and unique perspectives he makes an effective argument in favor of not implementing Internet taxes. Gilder starts off by attacking Republicans, which are traditional conservative, by saying that they suffer from the â€Å"tax-raising itch† (Gilder 1). He then moves on to say that two billionaires that he recently talked to are more afraid of a â€Å"reckless tax cut† than war or terrorism. Gilder is starting his argument off by using ethos argument by giving perspectives from high profile Silicon Valley cent millionaires. Gilder then goes onto to explain to his audience how taxes above a certain percent do not collect revenue. He does this by saying â€Å"that there has only been one advance since John Marshall opined that the power to tax is the power to destroy† (Gilder 3). John Marshall made this advance by showing that lower tax rates generate more revenues than higher ones. This is a logos argument, but is a fallacy because higher taxes would lead to higher revenues rather than lower taxes. Gilder then tries to make the argument that no tax rate above 20 percent collects revenue.

Bells Chemicals Coursework

Bells Chemicals is at present facing a major problem that it had never faced since its inception. As I have been given the responsibility to sort it out, I will work to the best of my knowledge and capabilities in arriving at an appropriate decision. The four-member team appointed to decide which of the two machines (Chemex and AFU) to purchase for its oldest product – Preserve, has not been successful in doing so.All the four members have their own viewpoints and the situation has become very confusing. The machines in the Preserve unit have not been replaced ever.They were performing well all these ten years, but now there is breakdown of one of the machines. There are two choices for the company i. e. buying the Chemex machine (the one that was being used all these years) again or to go for the new AFU unit. Arriving at a correct decision is the problem. Had the company made an autocratic decision there would have been no need to consult its key professionals. But this appr oach would have been termed unfriendly. The friendly approach has some of the disadvantages like the current dilemma.However, keeping aside other things, coming up with a perfect solution is the need of the hour now. I think the company should go for the Chemex machine. This decision of mine can be characterised as the rational way of decision-making. The Normative Decision Making model i. e. defining a problem and rigorously working around it has helped me in arriving at this decision. I have optimized as much as possible to come to a decision beneficial to the organisation. The rational approach of problem solving is the path I have taken. Main body of the report Mr. Steve Bell is not much interested in getting funds from outside.Especially when the company had recently financed most of its capital investments from its own retained profits, for products and capital investments for other products of the company. Capital required to install a new Chemex machine is much lower than th e AFU unit. Not only this, by installing the Chemex machine the company will also be saved with the hassle and stress of taking its first short term loan. The funding of regular operations of the company all round the year will get affected as the company has exhausted accumulated profits in developments and expansion of other products.Hence this financial year, internal funding is a major issue too. Operating cost of AFU unit is extremely expensive when compared to the operating cost of the Chemex. machine. At the present market stage it is impossible for the company to cover additional cost of ? 18000 as operating cost against advantages, which are not very well defined. If we go through the viewpoints of the marketing manager we can derive the following information about our present and expected market. †¢ Company’s production need for current market: 90000 Kg†¢ Company’s production need for expected market: 100000 Kg †¢ Annual market need for current market: 200000 Kg †¢ Annual market need for expected market: 250000 Kg When compared to the production and selling cost estimate of ? 320 per Kg for AFU unit to production and selling cost of ? 350 for Chemex machine, the AFU unit brings forward a brighter picture. Also with the AFU unit production and selling cost can be reduced by ? 2700000 a year at current production rate but we cannot neglect the high acquisition and operating cost attached to the AFU unit either.Retaining present market share should be the current goal of the company keeping in mind the emergence of new competitors in the market. The chief chemist has been trying to modify the product; Preserve so that it can be used in wider ranges of food products, but has not been successful yet. The increase in market demand at this market stage can also not be predicted. Therefore demand for increase in production is out of the way. Hence for the next couple of years it is advisable to install a new Chemex machine i nstead of the AFU unit to satisfactorily cover the market growth.Why to waste money on an expensive machine when a cheaper one can meet the requirements successfully? Quality is one of the major issues for the marketing manager with new competitors in the horizon. The marketing manager will naturally aim to increase, or at least retain his market share for the best benefits. If the AFU unit is installed then, there will be a major quality inconsistency. Chances are that the other Chemex machine that is giving good performance and the new AFU unit will produce different qualities of the same product. This is quiet normal because two different machines can give different end results.The integrity of the company will become questionable then. Customers will find two different items in two similarly packaged products. They might react negatively in this situation and chances are they might even turn to the products of our competitors. This is a big price to pay if AFU is installed. Inst alling AFU unit has one advantage and that is – it does not require expenditure in quality control as it has an automatic quality control system. On the other hand the recruited technicians of the company do the quality control of the Chemex machines.They are the regularly paid staff. With the installation of the AFU unit they will have to be paid the same money for half of the their actual work. Their salary cannot be cut down as chances of revolt in the company can erupt because they will never allow a cut in their salaries for no fault of theirs. Hence from this angle too it is a more intelligent step to go for the Chemex machine instead of the AFU unit. Keeping the high cost of the AFU unit, its maintenance will probably be good but we cannot be sure without testing it.Chemex machines require regular maintenance but this is not a problem for the company. Since Chemex is a local company, any breakdown is immediately rectified. After working with the Chemex machines for suc h a long period of time, the technicians have also become experts in handling its minor problems to a great extent. But the breakdown of the AFU unit will become a major headache for the company for sometime. Each time anything will go wrong, the company will have to get totally dependent on its manufactures who are not local like that of the Chemex machines.A lot of time will get wasted in all this. Keeping this factor in mind, again the Chemex machine scores over the AFU unit. Another major concern is the after sales service. After Sales Service of Chemex has been tested and they have always satisfied the company so the future is secure with this supplier. This cannot be said in the AFU’s case at the moment. I have applied Creative Decision Making model, Optimizing model, Kralijic’c Purchasing model and of course the Normative Decision Making model while arriving at the decision regarding the purchase of the correct machine.Through Creative Decision Making model I re cognized the problem after going through the case study. By going through the viewpoints of the four key members of the SMG team, I coherently arranged the information regarding the two machines. I analyzed the whole problem from different angles with the help of the information I had gathered and arranged. I came out with multiple solutions of the same problem. Then I went through all the alternatives one by one and chose the most correct option. Through the Optimizing model I was able to optimise the alternatives of the problem situation.Since this model is similar to the Creative Decision Making Model and the rational approach that I took, things became easier to sort out. According to Have et. al. (2003, p. 115) â€Å"The Kralijic’s (1983) purchasing model and the variations developed over the last decades help management select the most appropriate purchasing strategies for different types of products, thereby optimizing the trade-off between cost and risk. Costs includ e both the direct and indirect cost of purchasing, for example, management time, and trouble shooting and drawing up contracts. Two basic dimensions are included in Kraljic’s matrix:†¢ Impact on financial result †¢ Supply risk (or uncertainty)† I went through this approach too, to arrive at a strong and appropriate decision. Since requirement of this report was to base it on the Normative Decision Making model I followed the following steps while approaching the decision: †¢ Defining of the exact problem †¢ Setting of the objectives †¢ Identifying the alternatives †¢ Evaluating appropriately †¢ Making choice of the best alternative †¢ Sensitivity Analysis †¢ Arriving at the best decision Recommendation I recommend the company to go ahead and purchase the Chemex machine.By doing so the company would not only be paying attention to the profitability of the company, financial viability of the decision but also the satisfaction l evel of its entire staff. The customer will also remain loyal to the company because they will not find any inconsistency in the products they have got used to since the past ten years. The members of the SMG team who were pro AFU unit will also agree with me if they go through this report as at this stage when we have limited resources and growing number of competitors we should stick to the theory that ‘the old is gold’.References Drennan, D. , and Pennington, S. , 1999. 12 Ladders To World Class Performance: how YOUR organization can compete with the best in the world. UK: Kogan Page Limited. Fitzroy, P. , and Hulbert, J. , 2005. Strategic Management: Creating Value In Turbulent Times. Great Britain: John Wiley & Sons, INC. Have, S. T. , et. al. , 2003. Key Management Models: the management tools and practices that will improve your business. Great Britain: Pearson Education Limited. Hegde, Y. S. , and Krishna, R. , 1993. The A to Z of Management Skills. New Delhi: U BSPD.

The Manager Of Human Resource - 1069 Words

Dear Hilary, After reading your case scenario as the Manager of Human Resource, I would like to recommend you following things as written below: †¢ Company’s Goal, Mission and Vision: First of all, I will recommend you to make a proper mission, vision and values statement for the company. These are the roots of any organization which lead a path for their staff and give motivation to maintain or achieve that goals. As stated in quotation: â€Å"It is impossible to have a great life unless it is a meaningful life. And it is very difficult to have a meaningful life without meaningful work†. -Jim Collins (https://hbr.org/2012/12/to-give-your-employees-meaning.html) Mission statement tell them area in which a business functions and sets out its significant purpose. It sum up what the firm does and why. And vision define to long-term goals and ambitions clearly and in short. It is projected to inspire and encourage the organisation s staff by providing an image of where the business is heading. These are important because when people catch logic of their work, they feel that personally and in the sense of rights. They are more faithful to it, more intrinsically motivated, more engaged. And that makes for better performance on all dimensions. When employee understand the importance of these things they automatically contributed towards an overall growth of organization. These things put excitement, confidence in employee and also give a clear view to customer of that organization.Show MoreRelatedA Human Resource Manager Essay1189 Words   |  5 PagesAs a human resource manager, the understanding of the Equal Employment Opportunity laws are initi ally overwhelming, due to the amount of information dedicated to the subject. However, it is vitally important to comprehend and apply these laws to any organization, in order to avoid claims or litigation. 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