Effect of Step Feed Ratio and Temperature on Nitrogen Removal in an Anoxic-Oxic Activated Sludge Process.

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Astep-feed anoxic-oxic activated sludge process is one of the most practical methods for the up-grading of existing conventional ones to enhance nitrogen removal efficiency, eliminating internal water recirculation and supplement of external carbon source for denitrification. In this study, effect of step-feed ratio on the biological nitrogen removal of the process was investigated by a kinetic model in pilot-scale experiments. The results showed that the optimal step-feed ratio for nitrogen removal depended on water temperature in the tanks. There was little effect of the step-feed ratio on T-N removal at relatively low temperatures around 17°C. As the water temperature became lower, the nitrification efficiency seriously decreased, and then the effect of the step-feed on denitrification would be canceled. On the other hand, the optimal step-feed ratio for T-N removal was around 0.4 at 20 to 30°C. At higher temperatures, denitrification process seemed to be rate limited at the lower step-feed ratios, while the nitrification process would be rate limited at higher step-feed ratios.
日本水処理生物学会の論文