Wastewater biological treatment nitrification

Conventional wastewater treatment techniques consist of physical/chemical treatments, including oil separation, dissolved gas flotation, and ammonia distillation (for removal of free cyanides, free sulfides, and ammonia) followed by biological treatment (for organics removal) and residual ammonia nitrification. Almost all residuals from coke-making operations are either recovered as crude byproducts (e.g., as crude coal tar, crude light oil, ammonium sulfate, or other sulfur compounds)... 

Biological treatment techniques anaerobic digestion processes, aerobic digestion processes, nitrification, denitrification, and central biological wastewater treatment. 

On account of the high toxicity and considerable stability of phenols, these compounds lead to important problems in wastewater treatment. The biological treatment of water flows was inhibited by phenol at a concentration of 75 mg hydroquinone at a concentration of 15 mg 1 inhibited the biochemical treatment of wastewaters and the threshold concentration of the effect of 2,4-dinitrophenol on the biological treatment was found to be 20 mg 1 - m-aminophenol at a concentration of 1 mg 1 inhibited the BOD (biochemical oxygen demand) and nitrification of wastewaters. 

The constructed wetland with the aerobic tank and anaerobic/anoxic tank connected in series was employed for the treatment of raw municipal wastewater. More than 94% of the initial BOD and 80% of the initial T-N could be removed. Successful biological nitrification was... 

Beg, S.A. et al. Effect of toxicants on biological nitrification for treatment of fertilizer industry wastewater. In Proceedings of 35th Industrial Waste Conference, Purdue University, Lafayette, BSf, 1980 Vol. 35, 826-834. 

Nitrification has been extensively investigated as a very useful process in the first step of nitrogen removal in biological wastewater treatment. The oxidation of ammonia and nitrite by nitrifying processes generates nitrate for denitrifying processes where nitrate is converted to molecular nitrogen. 

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