温度冲击引起的丝状菌污泥膨胀菌群特征

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Abstract Temperature is the key important factor affecting sludge bulking. To investigate the mechanism of sludge bulking at different temperature shockings, themicrobial community structure and dominant filamentous bacteria in sequencing batch reactor (SBR) treating domestic sewage under abruptly/gradually temperature decreasing conditions were analyzed by Illumina MiSeq high-throughput sequencing technology. The results showed that Microthrix Parvicella was the dominant filamentous bacteria in the abruptly temperature dropping system in which the sludge volume index (SVI) increased up to 291mL/g, while filamentous bacteria Eikelboom Type 0092 was the dominant in the gradually decreasing system in whichthe SVI was maintained at 250mL/g. Therefore, temperature shocking can provide more suitable habitat for Eikelboom Type 0092. The temperature varying process will also lead to significant differences in the community structure. The relative abundance of Proteobacteria maintained at average of 39.3%, and showed little variation, but the Actinobacteria and Chloroflexi showed totally different trends. The mean relative abundance of microorganisms related to organic matter removal was stable at 13.6%, and for Nitrospira it was about 2.48% accounting for more than 80% of the total NOB. Limited filamentous bulking (LFB) of Eikelboom Type 0092 caused by gradually temperature decreasing could not lead to serious deterioration of effluent quality, and removal rate of COD and NH₄⁺-N were better than temperature abruptly dropping system.

Key words： temperature shocking Eikelboom Type 0092 microbial community functional bacteria limited filamentous bulking (LFB)

Received: 22 November 2021

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X703

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	GAO Chun-di
	HAN Ying-lu
	CHENG Li-yang
	YANG Xiao-yang
	BI Hao-hua
	OU Jia-li
	PENG Yong-zhen

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GAO Chun-di,HAN Ying-lu,CHENG Li-yang等. Microbialcommunitycharacteristics offilamentous sludge bulking at temperature shocking environment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(6): 2680-2689.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I6/2680

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