游离亚硝酸(FNA)对A<sup>2</sup>O污泥菌群结构的影响

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Abstract

In order to assess the feasibility of achieving nitritation in the anaerobic/anoxic/oxic (A²O) system through the strategy of free nitrous acid (FNA) sludge treament,the activities of ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) activities was studied.Besides,the variations of nutrient removal performance and microorganism community structures in the A²O reactor after long-term FNA sludge treatment were investigated.Results showed that the activities of AOB and NOB decreased by 60% and 86% respectively after the sludge subjectd to FNA treatment at 1.12mg HNO₂-N/L for 3h.The average effluent concentrations of NH₄⁺-N,NO₂^--N and NO₃^--N in the A²O system were 12.76,1.56 and 7.82mg/L respectively.The nitrite accumulation rate (NAR) was around 20%,indicating that nitritation in the A²O system was not achieved by the FNA sludge treament.Furthermore,High-throughput sequencing and qPCR results showed that AOB abundance was greatly decreased from 2.05×10⁸copies/gVSS to 3.96×10⁵copies/gVSS and the ammonia oxidation process was negatively affected.In addition,Nitrobacter and Nitrospira were also inhibited,while Nitrotoga accounted for 1.66% of total sequences,for which the nitritation in the A²O system was not achieved by FNA sludge treatment strategy.

Key words： nitritation FNA ammonium oxidizing bacteria (AOB) nitrite oxidizing bacteria (NOB) community structures A²O

Received: 12 December 2016

PACS:

X703

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	Articles by authors
	MA Lin-na
	LIU Wen-long
	ZHANG Qiong
	PENG Yong-zhen

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MA Lin-na,LIU Wen-long,ZHANG Qiong等. Effect of free nitrous acid (FNA) on microorganism community structures of A²O sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(7): 2566-2573.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I7/2566

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