AOA系统厌氧时间和溶解氧对内源反硝化脱氮速率的影响

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Abstract The Anaerobic/Aerobic/Anoxic (AOA) process based on endogenous denitrification gained widespread attention in recent years with the benefits of carbon saving and consumption reduction. Nitrogen is mainly removed via the endogeous denitrification occurred in the post-anoxic phase of the AOA process. Therefore, increasing endogenous denitrification rate (EDNR) is the crucial to enhance the nitrogen removal efficiency. To explore the methods to improve the nitrogen removal efficiency of AOA process, the effects of the anaerobic duration and dissolved oxygen (DO) concentration in the aerobic phase on EDNR were investigated in this study. Results showed that the EDNR was the maximum when the anaerobic duration was 60min at the influent COD concentration of 155.1mg/L. Under different influent COD concentration, the accumulation of polyhydroxyalkanoates (PHAs) (a kind of intracellular carbon) reached the peak by controlling the appropriate anaerobic duration, and the EDNR was maximized. The EDNR was affected by excessive or insufficient DO in aerobic phase, and the highest EDNR was achieved when DO was controlled at 1mg/L. The EDNR was increased by 31.7% and 18.4% through anaerobic duration optimization and DO control, respectively. This paper provided a feasible strategy to enhance the EDNR in the post-anoxic phase of the AOA process, which is conducive to the optimization of the AOA process designs and operation strategies.

Key words： biological nitrogen removal endogenous denitrification rate anaerobic duration dissolved oxygen control

Received: 20 July 2022

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X703

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	Articles by authors
	AN Ze-ming
	DING Jing
	GAO Xin-jie
	PENG Yong-zhen

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AN Ze-ming,DING Jing,GAO Xin-jie等. Effects of anaerobic duration and dissolved oxygen on endogenous denitrification rate in AOA system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 667-674.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I2/667

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