溶解氧对Anammox滤池内功能菌群及活性的影响

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Abstract The current researches on microorganisms in anammox system were mainly focused on anaerobic ammonium oxidation bacteria. The microbial community structure and the key kinetic parameters of anaerobic ammonium oxidation bacteria (AnAOB), ammonia oxidizing bacteria (AOB), nitrite oxidizing bacteria (NOB) and denitrifying bacteria (DNB) in anammox filter were measured and analyzed in this study. Moreover, the effects of DO concentration in the range of 0.2~1.5mg/L on the activity of AnAOB, AOB and NOB were investigated. The results showed that the anammox filter of long-term stable operation was still a mixed system with multiple bacterial groups, in which anammox bacteria was the main function bacteria. The activity of AnAOB with 5.3mgN/(gVSS·h) was the highest among the functional bacteria in the filter; whereas DNB and AOB had a certain activity. When DO concentration increased from 0.2mg/L to 1.5mg/L, the activity of AnAOB almost kept stable; whereas, the specific ammonia oxidation rate of AOB increased from 0.76mgN/(gVSS·h) to 1.08mgN/(gVSS·h). The obtained oxygen half saturation constant (K_O₂_{, AOB}) of AOB was (0.106 ±0.010) mg/L, which indica ted that AOB has high affinity for oxygen. During the entire experiment, the activity of NOB was not detected. Therefore, in the anammox system, the main functional bacteria coexisted and competed each other for substrates.

Key words： dissolved oxygen biofilm nitrifying bacteria activity anaerobic ammonia oxidation activity denitrification activity

Received: 24 August 2020

PACS:	X703
	X172

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	Articles by authors
	WU Wen-jun
	LIU Xiu-hong
	CUI Bin
	LIU Run-yu
	YANG Qing

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WU Wen-jun,LIU Xiu-hong,CUI Bin等. Effect of dissolved oxygen on the community and activities of functional bacteria in anammox biofilter[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1415-1421.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1415

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