Anoxic phosphorus removal in a pilot scale anaerobic-anoxic oxidation ditch process

doi:10.1007/s11783-009-0005-8

Front Envir Sci Eng Chin

2009, Vol. 3

Issue (1) : 106-111 https://doi.org/10.1007/s11783-009-0005-8

RESEARCH ARTICLE

Anoxic phosphorus removal in a pilot scale anaerobic-anoxic oxidation ditch process

Hongxun HOU^1,2, Shuying WANG¹(

), Yongzhen PENG¹, Zhiguo YUAN³, Fangfang YIN¹, Wang GAN²

1. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China; 2. Anhui Guozhen Environmental Protection Science and Technology Co., Ltd., Hefei 230088, China; 3. Advanced Wastewater Management Centre (AWMC), The University of Queensland, St Lucia, Brisbane, Qld 4072, Australia

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Abstract

The anaerobic-anoxic oxidation ditch (A²/O OD) process is popularly used to eliminate nutrients from domestic wastewater. In order to identify the existence of denitrifying phosphorus removing bacteria (DPB), evaluate the contribution of DPB to biological nutrient removal, and enhance the denitrifying phosphorus removal in the A²/O OD process, a pilot-scale A²/O OD plant (375 L) was conducted. At the same time batch tests using sequence batch reactors (12 L and 4 L) were operated to reveal the significance of anoxic phosphorus removal. The results indicated that: The average removal efficiency of COD, NH4+, PO43-, and TN were 88.2%, 92.6%, 87.8%, and 73.1%, respectively, when the steady state of the pilot-scale A²/O OD plant was reached during 31-73 d, demonstrating a good denitrifying phosphorus removal performance. Phosphorus uptake took place in the anoxic zone by poly-phosphorus accumulating organisms NO2- could be used as electron receptors in denitrifying phosphorus removal, and the phosphorus uptake rate with NO2- as the electron receptor was higher than that with NO3- when the initial concentration of either NO2- or NO3- was 40 mg/L.

Keywords wastewater treatment anaerobic-anoxic (A²/O) oxidation ditch (OD) biological phosphorus removal denitrifying phosphorus removal

Corresponding Author(s): WANG Shuying,Email:wsy@bjut.edu.cn

Issue Date: 05 March 2009

Cite this article:

Hongxun HOU,Shuying WANG,Yongzhen PENG, et al. Anoxic phosphorus removal in a pilot scale anaerobic-anoxic oxidation ditch process[J]. Front Envir Sci Eng Chin, 2009, 3(1): 106-111.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-009-0005-8
https://academic.hep.com.cn/fese/EN/Y2009/V3/I1/106

Fig.1 Schematic diagram of OD system

Tab.1 Major characteristics of the influent (mg·L, except pH)

Fig.2 Profiles of , , , , and COD concentrations in the pilot-scale A/O OD system

Fig.3 Profiles of concentration in the pilot-scale A/O OD system

Fig.4 Profiles of , , and COD concentrations of batch test I

Fig.5 Profiles of P uptake under aerobic and anoxic conditions with 3 different types of electron acceptors after P released

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