Nutrient removal performance of an anaerobic–anoxic–aerobic process as a function of influent C/P ratio

Authors: Ma, Yong¹; Peng, Yong-zhen; Wang, Xiao-lian²; Wang, Shu-ying²

Source: Journal of Chemical Technology & Biotechnology, Volume 80, Number 10, October 2005 , pp. 1118-1124(7)

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Abstract:

The laboratory scale anaerobic–anoxic–aerobic (A²O) process fed with synthetic brewage wastewater was designed to investigate the effects of changing feed C/P ratio on the performance of biological nutrient removal (BNR) processes. In the experiment, the influent chemical oxygen demand (COD) concentration was kept at approximately 300 mg L^-1 while the total phosphorus concentration was varied to obtain the desired C/P ratio. Results showed that when the C/P ratio was lower than 32, phosphorus removal efficiency increased as C/P ratio increased linearly, while when the C/P ratio was higher than 32, the P removal efficiency was maintained at 90–98%, and effluent P concentration was lower than 0.5 mg L^-1. However, regardless of the C/P ratio, excellent COD removal (90% or higher) and good total nitrogen removal (75–84%) were maintained throughout the experiments. It was also found that very good linear correlation was obtained between COD uptake per unit P released in the anaerobic zone and C/P ratio. In addition, the P content in the wasted activated sludge increased with the decrease in the C/P ratio. Based on the results, it was recommended that the wastewater C/P ratio and its effects be incorporated into BNR design and operational procedures, appropriate C/P ratios were used to achieve the effluent treatment goals. Copyright © 2005 Society of Chemical Industry

Keywords: anaerobic–anoxic–aerobic (A2O) process; influent C/P ratio; biological nitrogen and phosphorus removal

Document Type: Research article

DOI: http://dx.doi.org/10.1002/jctb.1291

Affiliations: 1: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150090, China 2: Key Laboratory of Beijing Water Environment Recovery, Beijing University of Technology, Pingleyuan 100, Chaoyang District, Beijing 100022, China

Publication date: 2005-10-01

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Nutrient removal performance of an anaerobic–anoxic–aerobic process as a function of influent C/P ratio

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