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Nitrogen and Phosphorus Removal from Effluent of Sewage Treatment Plant Using Water Lettuce (Pistia stratiotes)

Abdul Hamid, Hafizan Lutfi (2008) Nitrogen and Phosphorus Removal from Effluent of Sewage Treatment Plant Using Water Lettuce (Pistia stratiotes). Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

Although our country has wastewater treatment plant, the main problem is it cannot be classified as world class standard. It means some compounds which can harm the environment still exist in the river although wastewater was treated by treatment plant. For example the amount of the nutrient components which are nitrogen and phosphorus still contain in our UTP sludge treatment plant eftluent. The main effect is the rivers become toxic to aquatic organisms and polluted to environment life. Eutrophication is frequently a result of nutrient pollution (means an increase in chemical nutrients typically compounds containing nitrogen or phosphorus in an ecosystem) such as the release of sewage eftluent and run-off from lawn fertilizers into natural waters (rivers or coasts), where the water becomes cloudy, colored a shade of green, yellow, brown, or red and then the river becomes toxic to aquatic life like fish. Beside that, human society is impacted as well, where health-related problems can occur where eutrophic conditions interfere with drinking water treatment. The main problem which occurs before deciding to have this project is because our UTP Sewage Treatment Plant (STP) effiuent still discharged to the nearest river with nitrogen and phosphorus compounds. If we don't take any action to remove this type of compounds, this problem maybe can cause eutrophication to occur. Nitrogen exists in many forms because of the high number of oxidation states it can assume. In ammonia and organic nitrogen compounds, which are forms most closely associated with plants and animals, its oxidation state is -3. At the other extreme, when nitrogen is in the nitrate form, its oxidation state is +5 [2]. The presence of nitrogen in a wastewater discharge can be undesirable as free ammonia it is toxic to fish and many other aquatic organisms; as ammonia it is an oxygenconsuming compound which will reduce the dissolved oxygen in the river. In all forms, nitrogen can be available as a nutrient to aquatic plants and consequently contribute to eutrophication. Where the nitrate ion it is a potential public health hazard in water consumed by infants [2]. The standard criteria limit for Nitrate-nitrogen in the river according to US Environmental Protection Agency is 10 mg/L, but according to State of the Minnesota River the limit is 6.5 mg/L.

Item Type: Final Year Project
Academic Subject : Academic Department - Civil Engineering - Water and environment - Environmental - Hazardous waste
Subject: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Engineering > Civil
Depositing User: Users 2053 not found.
Date Deposited: 28 Oct 2013 11:07
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/9991

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