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Nitrification of Ammonical Wastewaters by Mixed Bacterial Cultures


Affiliations
1 Department of Chemical Engineering (Biotechnology), College of Engineering, Andhra University, Visakhapatnam, A.P., India
2 Deptt. of Biotechnology, College of Engineering, GITAM, Visakhapatnam-530 045, A. P., India
 

The paper deals with nitrification of ammonical nitrogen in synthetic wastewater and coke oven wastewater of Visakhapatnam steel plant. Synthetic wastewater was prepared and coke oven wastewater was collected from the MBC plant of Visakhapatnam steel plant. Nutrients and Nitrosomonas and Nitrobacter cultures were added to both the wastewaters before the nitrification process. A bench scale experimental set-up was fabricated for the biological nitrification of ammonical wastewater. The experiments were conducted at different flow rates, solid retention and hydraulic residence times. For all the experimental runs MLSS and MLVSS of the nitrification tank were determined. The influent and effluent concentrations of ammonical nitrogen, alkalinity and COD were also determined. The kinetic and decay coefficients of the nitrifying and the heterotrophic bacteria were calculated.
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  • Nitrification of Ammonical Wastewaters by Mixed Bacterial Cultures

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Authors

V. Sridevi
Department of Chemical Engineering (Biotechnology), College of Engineering, Andhra University, Visakhapatnam, A.P., India
M. V. V. Chandana Lakshmi
Deptt. of Biotechnology, College of Engineering, GITAM, Visakhapatnam-530 045, A. P., India

Abstract


The paper deals with nitrification of ammonical nitrogen in synthetic wastewater and coke oven wastewater of Visakhapatnam steel plant. Synthetic wastewater was prepared and coke oven wastewater was collected from the MBC plant of Visakhapatnam steel plant. Nutrients and Nitrosomonas and Nitrobacter cultures were added to both the wastewaters before the nitrification process. A bench scale experimental set-up was fabricated for the biological nitrification of ammonical wastewater. The experiments were conducted at different flow rates, solid retention and hydraulic residence times. For all the experimental runs MLSS and MLVSS of the nitrification tank were determined. The influent and effluent concentrations of ammonical nitrogen, alkalinity and COD were also determined. The kinetic and decay coefficients of the nitrifying and the heterotrophic bacteria were calculated.