低DO硝化耦合内碳源反硝化脱氮处理生活污水

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Abstract

To further utilize carbon source and reduce aeration energy consumption, endogenous denitrification reactor (ED-SBR) coupled with the low DO nitrification reactor (LDON-SBR) were used to treat low C/N domestic wastewater without additional carbon sources. The operation mode was: anaerobic (ED-SBR)-aerobic (LDON-SBR)-anoxic (ED-SBR). The feasibility of endogenous denitrification coupled with the low DO nitrification was evaluated according to the performance of ED-SBR/ LDON-SBR system. The results showed that low DO concentration (0.3~0.5mg/L) maintained a stable nitrification performance in the LDON-SBR, and the nitrifying efficiency reached up to 90%. Meanwhile low DO concentration enhanced simultaneous nitrification and denitrification (SND), and the average SND rate was 29.6% in the LDON-SBR; In the ED-SBR, the organic matter of influent was stored as internal carbon source in the anaerobic period. The stored internal carbon source could be used for endogenous denitrification in the next anoxic period, which reduced NO₃^--N concentration from 27.3mg/L to 3.9mg/L in the ED-SBR with a NO₃^--N removal rate of 86.5%; In addition, the COD removal rate was about 80% in the low DO nitrification coupled with endogenous denitrification system.

Key words： activated sludge low dissolved oxygen domestic waste-water nitrification endogenous denitrification

Received: 27 August 2018

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X703

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	LI Fang-zhou
	ZHANG Qiong
	PENG Yong-zhen

Cite this article:

LI Fang-zhou,ZHANG Qiong,PENG Yong-zhen. Treatment of domestic wastewater by low DO nitrification coupled with endogenous denitrification system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1525-1532.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I4/1525

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