基于磷回收的低温微氧EBPR系统的表观与微观特性

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Abstract Two alternative anaerobic/oxic SBR (A/O-SBR) reactors controlled at medium temperature (22±1)℃SBR1and low temperature (14±1)℃SBR2were operated to investigate the effect of side-stream phosphorus recovery on nutrients removal performance, microbial community structure and phosphorus recovery potential of mainstream EBPR systems under low dissolved oxygen (DO = 1mg/L). The results showed that the nitrogen and COD removal performance of SBR1and SBR2 were not influenced by the introduction of side-stream phosphorus recovery. In terms of phosphorus removal, however, EBPR performance of SBR1was more stable and more tolerant to phosphorus deprivation. During the phase of side-stream phosphorus recovery, the average efficiency of phosphorus removal in SBR1reached 90.7%, while SBR2 was 78.4%. It was also found that microaerobic EBPR subjected to side-stream phosphorus recovery could maintain a relatively stable volatile suspended solids (VSS) concentration at low temperature. While the value of SVI increased from 104.6mL/g to 216.8mL/g after side-stream phosphorus recovery, resulting in sludge bulking in SBR2 system. The result of high-throughput sequencing based on 16S rRNA showed that the microbial community structure of the mainstream system changed significantly after side-stream phosphorus recovery. The relative abundances of Candidatus Competibacter, Flavobacterium and Dechloromonas rapidly increased and Candidatus Accumulibacter fell from 12.5% to 6.4%. It was estimated that the average phosphorus recovery potential of SBR1 and SBR2 were 68.8% and 69.4%, respectively, with the side-stream ratio of 1/3. In a conclusion, the temperature was one of the important factors to ensure the stable operation of side-stream phosphorus recovery in an EBPR system under low DO.

Key words： A/O-SBR anaerobic side-stream phosphorus recovery low temperature low DO EBPR

Received: 30 August 2021

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X703.1

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	TIAN Wen-qing
	YU Xiao-jun
	DENG Ying
	CAI Yu-qi
	JIN Hai-dong
	KANG Su-qin
	MA Juan

Cite this article:

TIAN Wen-qing,YU Xiao-jun,DENG Ying等. Apparent and microscopic performance of low temperature and low dissolved oxygen EBPR system subjected to side-stream phosphorus recovery[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1625-1634.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1625

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