IFAS工艺短程硝化过程中功能菌的动力学特性

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Abstract

The kinetic characteristics of aerobic ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) under different influent NH₄⁺-N loading and free ammonia (FA) concentration were studied by biofilm-activated sludge composite process (IFAS). The contributions of different microbial aggregates (suspended sludge and attached biofilm) to the removal of NH₄⁺-N were investigated, and the biological adsorption and biodegradation were analyzed quantitatively. The amount and spatial distribution of total bacteria, AOB, and NOB were observed by fluorescence in situ hybridization (FISH). The experimental results showed that with the increased of influent NH₄⁺-N concentration, the effluent NO₃^--N concentration decreased and the NO₂^--N accumulated a lot. When the influent NH₄⁺-N concentration was 480mg/L, the NH₄⁺-N removal rate and the nitrite accumulation rate (NAR) were stable above 95% and 80%, respectively, while the FA increased from (2.77±0.07) mg/L to (16.35±0.3) mg/L, and the NAR increased from 9.42% to 83.31%, which achieved the inhibition of NOB. In the process of NH₄⁺-N removal, biossorption and microbial degradation accounted for 3.4% and 88.1% of NH₄⁺-N removal, respectively. The ratio of AOB in suspended sludge and biofilm increased from 27.4% and 10.3% to 41.3% and 18.1%, respectively, indicating that suspended sludge was more beneficial to enrichment of AOB than biofilm.

Key words： partial nitrification IFAS inhibition kinetic adsorption

Received: 09 September 2019

PACS:

X703.5

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	Articles by authors
	ZHANG Kai
	LI Jun
	LIANG Dong-bo
	HOU Lian-gang
	ZHANG Jing
	WANG Xiu-jie

Cite this article:

ZHANG Kai,LI Jun,LIANG Dong-bo等. Kinetic characteristics of functional bacteria in IFAS process for partial nitrification[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1507-1514.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I4/1507

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