A/O-MBBR工艺处理生活污水性能及菌群结构

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Abstract An integrated anoxic/oxic-moving bed biofilm reactor (A/O-MBBR) with a scale of 100m³/d was adopted to treat domestic sewage. The performance of carbon and nitrogen removal under multi-factor disturbances was investigated through a 265 day pilot study. Furthermore, the dynamic changes of the microbial community structure in different treatment phases were studied. Results revealed that the integrated A/O-MBBR system showed excellent COD and nitrogen removal performance. Under the conditions of 2.5~3.5mg/L dissolved oxygen (DO) in aerobic tank and influent carbon to nitrogen (COD/N) ratio of (7.9±2.0), the removal rates of COD, NH₄⁺-N and TN could reach (93.3±5.4)%, (99.1±0.6)%, (67.9±10.5)%, respectively. Proteobacteria, Bacteroidetes and Chloroflexi were abundant in different running phases, which ensured the efficient removal of organic matters. In the initial running phase, denitrification functional bacteria of A/O-MBBR system were mainly distributed in activated sludge with relatively low abundance. After a long-term operation, a large number of nitrifying and denitrifying bacteria were simultaneously detected in both biofilm and activated sludge, and the nitrifying bacteria with the highest relative abundance was Nitrospira, which was mainly distributed on the biofilm (19.48%~28.05%). Meanwhile, Thauera, Terrimonas and Dokdonella were the dominant denitrifying bacteria in the later running phase.

Key words： integrated anoxic/oxic-moving bed biofilm reactor (A/O-MBBR) domestic sewage multi-factor disturbances microbial community structure characteristics

Received: 25 October 2021

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	LAI Yong-heng
	LIU Min

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LAI Yong-heng,LIU Min. Performance and microbial community of anoxic/oxic-moving bed biofilm reactor (A/O-MBBR) process treating domestic sewage[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2120-2128.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/2120

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