前置A<sub>2</sub>NSBR系统硝化和反硝化除磷的特性

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Abstract Biofilm nitrification and activated sludge denitrifying phosphorus removal performance were investigated in the pre-A₂ NSBR system, which treated real low carbon to nitrogen (C/N) ratio domestic sewage. The effect of organic substance and NO₂^--N concentration on the biofilm nitrification performance, and different electronic acceptors on the denitrifying phosphorus uptake rate were studied. Results indicated that nitrification rate was 11.3 mgNH₄⁺-N/(L·h), the ammonia volume loading was 0.27 kgNH₄⁺-N/(m³·d) under the filling rate of 40%, the nitrification performance was inhibited by organic substance, but the system showed a good nitrification rate of 9.72 mg NH₄⁺-N/(L·h) when organics presented. NO₂^--N treatment exhibited little effect on the AOB activity but obvious effect on the NOB activity, the NOB activity was almost completely inhibited (only 1.63%) when NO₂^--N concentration was 400mg/L. According to the phosphorus uptake rate experiment under different electronic acceptors, the phosphorus uptake rate under oxygen and NO₃^--N was 17.62mg P/(g VSS·h) and 12.94mg P/(g VSS·h), respectively, anoxic phosphate accumulating organisms (PAOs) occupied 73.4% of the total PAOs, phosphorus uptake performance was inhibited when the NO₂^--N concentration was 30mg/L, and phosphorus uptake performance was inhibited when the NO₂^--N concentration was 15mg/L under the condition of NO₂^--N and NO₃^--N coexisted.

Key words： low C/N ratio pre-A₂NSBR process nitrification denitrifying phosphorus removal NO₂^--N inhibition

Received: 24 April 2019

PACS:

X703.5

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	Articles by authors
	ZHAO Wei-hua
	LI Jian-wei
	WANG Mei-xiang
	HUANG Yu
	FENG Yan
	LI Xi-yao
	PENG Yong-zhen

Cite this article:

ZHAO Wei-hua,LI Jian-wei,WANG Mei-xiang等. Nitrification and denitrifying phosphorus removal performance in the pre-A₂ NSBR system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4660-4665.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I11/4660

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