FNA对短程硝化污泥菌群结构的影响

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Abstract

The long-term effects on ammonia-oxidizing bacteria (AOB), filamentous bacteria and microorganism community structures in partial nitrification sludge was investigated by adding a pretreatment unit of free nitrous acid (FNA) in the sequence bath reactor (SBR) for three days at 1.2mg HNO₂-N/L for 4.5. The results showed that FNA had the short-time effect on AOB, Candidatus_Microthrix and Cytophagaceae of the dominant filamentous bacteria were also decreased from 5.1% and 1.1% to 0.78% and almost invisible. Sludge volume index (SVI) maintained at 110mL/g dropping from 281mL/g, and the nitrite accumulation rate (NAR) was kept at around 90%, indicating the partial nitrification was not undermined. Furthermore, High-throughput sequencing results showed that the diversity and uniformity of microorganism community decreased. However, the proliferation of Thauera and Ottowia increased to 5.58% and 7.82%. Simultaneous nitrification and denitrification (SND) had significant effects, and the total nitrogen removal rate was nevertheless maintained more than 60% even only with partial nitrification.

Key words： partial nitrification sludge bulking sludge settleability filamentous bacteria AOB microorganism community structures SND

Received: 15 October 2018

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X172

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	Articles by authors
	GAO Chun-di
	ZHAO Nan
	AN Ran
	HAN Hui
	ZHANG Na
	PENG Yong-zhen

Cite this article:

GAO Chun-di,ZHAO Nan,AN Ran等. Effect of FNA on microorganism community structures of partial nitrification sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1977-1984.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I5/1977

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