Kinetics of nitrogen removal in anoxic-anaerobic-aerobic process

Kriengsak Udomsinrot

Authors

Kriengsak Udomsinrot Department of Environmental Engineering, College of Engineering, Rangsit University, Patumthani 12000, Thailand

Keywords:

kinetics, anoxic, nitrogen, nitrification, denitrification, kinetic coefficients

Abstract

Nitrogen removal from wastewater is important to protect the receiving waters from the objectionable aquatic plant growth. Biological nitrogen removal has received considerable interest in recent years. Anoxic-anaerobic-aerobic process was designed and operated to achieve high removals of carbon, nitrogen, and phosphorus from municipal and industrial wastewaters without the addition of chemicals. The research project was to develop the biological kinetic coefficients of nitrogen removal. To determine the coefficients, the mean cell residence time was varied and were operated at five different MLVSS concentrations: 3652, 3315, 2657, 2064, and 1490 mg/L. The theoretical model used in this paper is a Monod-type expression. Nitrification and denitrification kinetic coefficients (Y_N, k_d,N, K_N, k_N, Y_DN, k_d,DN) were analyzed. Nitrification kinetic coefficients (Y_N, k_d,N, K_N, and k_N) were 2.28, 0.02, 0.19, and 0.11 respectively. Denitrification kinetic coefficients (Y_DN and k_d,DN) were 1.70 and 0.03 respectively. The relationship between specific denitrification rate and substrate utilization rate for the anoxic stage were also studied.

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