低DO对活性污泥系统碳和氮去除影响的研究

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Abstract

Impact of dissolved oxygen (DO) on pollutant removal and bacterial community structure was evaluated in a plug-flow activated sludge system. Results show that the bioprocess could still maintain high removal efficiencies of chemical oxygen demand and nitrogen from sewage when DO concentration decreased from 2.0 to 0.3mg/L, however, the nitrogen removal efficiency fluctuated greatly. The functional bacteria Proteobacteria remained dominant (~ 65%) under lower DO conditions, yet the total bacterial community structure changed in the aeration tank. The Nitrosomonas oligotropha-like ammonia-oxidizing bacteria, Nitrobacter winogradskyi spp., and Group1Nitrospira were identified as the major contributor of nitrification under low DO conditions. The quantitative PCR analysis showed that reducing DO concentration from 2.0 to 0.5mg/L enriched the nitrifiers (mainly Nitrospira), thereby ensuring complete nitrification under low DO conditions. The kinetics coefficient analysis also indicated that reducing DO concentration did not significantly affect the nitrifying bacterial growth, but retarded their decay to ensure biomass in the activated sludge system. These results provide positive support for wastewater treatment plants for saving energy by reducing DO concentration in the aeration tank.

Key words： low DO energy-saving nitrification A/O process microbial community plug-flow activated sludge system

Received: 06 December 2019

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X703

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	Articles by authors
	LIU Guo-hua
	LIU Yu-chen
	CHEN Yan
	ZHANG Qian
	XU Xiang-long
	QI Lu
	WANG Hong-chen

Cite this article:

LIU Guo-hua,LIU Yu-chen,CHEN Yan等. Effects of low dissolved oxygen on carbon and nitrogen removal in activated sludge process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(6): 2503-2512.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I6/2503

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