Nitrification kinetics of a full-scale anaerobic/anoxic/aerobic wastewater treatment plant

Zhen ZhouCollege of Environmental and Chemical Engineering, Shanghai University of Electric Power, Changyang Road 2588#, Shanghai200090, China, Tel./Fax: +86 21 35303544Correspondence[email protected]

Dalong HuCollege of Environmental and Chemical Engineering, Shanghai University of Electric Power, Changyang Road 2588#, Shanghai200090, China, Tel./Fax: +86 21 35303544Correspondence[email protected]

Lingyan JiangShanghai Chentou Wastewater Treatment Co., Ltd., Shanghai201203, China, Tel. +86 21 58953344; Fax: +86 21 58950692Correspondence[email protected]

Can XingCollege of Environmental and Chemical Engineering, Shanghai University of Electric Power, Changyang Road 2588#, Shanghai200090, China, Tel./Fax: +86 21 35303544Correspondence[email protected]

Yingying ZhuCollege of Environmental and Chemical Engineering, Shanghai University of Electric Power, Changyang Road 2588#, Shanghai200090, China, Tel./Fax: +86 21 35303544Correspondence[email protected]

Meng JiangCollege of Environmental and Chemical Engineering, Shanghai University of Electric Power, Changyang Road 2588#, Shanghai200090, China, Tel./Fax: +86 21 35303544Correspondence[email protected]

Weimin QiaoCollege of Environmental and Chemical Engineering, Shanghai University of Electric Power, Changyang Road 2588#, Shanghai200090, China, Tel./Fax: +86 21 35303544Correspondence[email protected]

Zhen LiShanghai Chentou Wastewater Treatment Co., Ltd., Shanghai201203, China, Tel. +86 21 58953344; Fax: +86 21 58950692Correspondence[email protected]

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Abstract

Nitrification kinetics of a full-scale anaerobic/anoxic/aerobic wastewater treatment plant were investigated by considering the anaerobic (η_A) and anoxic reduction factors (η_N) on decay rate of nitrifying biomass (b_AUT) for estimating minimum sludge age (θ_mc). Ammonium nitrogen in the effluent was fluctuating seasonally with low nitrification efficiency from December to June. The measured b_AUT values were 0.175, 0.092, and 0.077 d⁻¹ under aerobic, anoxic, and anaerobic conditions, respectively. A low maximum specific growth rate at 20°C (0.48 d⁻¹) and high temperature correction factor (1.208) were yielded in the range of 10–25°C, indicating that the activity of nitrifying biomass was low and depended more sensitively on lower temperatures. At temperature below 12.1°C, the decay rate of nitrifying biomass exceeded growth rate, and a negative θ_mc was obtained. The extremely high (12.1–15.0°C) or negative (<12.1°C) θ_mc indicated that prolonging sludge age was probably malfunctioned at cold temperature.

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Acknowledgments

This work was financially supported by Chinese National High-tech R&D Program (863 Program) [grant number 2012AA063403].

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