Enviromental engineering Essay Example | Topics and Well Written Essays - 1000 words

Enviromental engineering - Essay ExampleChemical or biological litigatees female genital organ help specific sources of daystar as from wastewater treatment plants (Henze & Van Loosdrecht 155).Biological alimental removal processes in the treatment of waste waters lead to environmental, operational and economic benefit. For this purpose, stricter rules ar being enforced for removing phosphorus from waste water.The different nutrient removal processes are chemical, physical and biological. Various biological methods are available for removing both nitrogen and phosphorus. The process of biological nutrient removal or BNR is based on a chain of biochemical reactions that convert nitrogen to another form. The main changes are nitrification and denitrification. Nitrification is the conversion of ammonium, NH4+ to nitrite, NO2-, and ultimately to nitrate, NO3- (PWTB A-4).Denitrification is the process by which, with push through dissolved oxygen bacteria use nitrate as a terminus electron acceptor and convert it to nitrogen gas. Denitrification occurs rapidly when an external substrate like wastewater or methyl alcohol is present for bacterial growth. Denitrification takes place slowly in the event of bacteria using nitrate in the absence of an external substance source. This is also termed as endogenous-level denitrification. The denitrification rates at endogenous level matter on sludge age and the active mass fraction of denitrifying bacteria (PWTB A-4).The effectiveness of the biological nutrient removal system is impacted by the characteristics of the waste water influent to each zone of the process (PWTB A-13). Both biological nitrogen removal and biological phosphorus removal can be carried out successfully only in the presence of adequate biodegradable organic substrate. The efficiency of the biological phosphorus removal process differs according to the specific organic compound available in the anaerobic zone. thither is reduced efficiency of nit rogen