AOA-O模式下好氧颗粒污泥同步硝化内源反硝化除磷

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Abstract In order to construct a simultaneous nitrification endogenous denitrification phosphorus removal granular sludge system, four groups of anaerobic/aerobic/anoxic (AOA) and AOA-O with different post-aeration time (5min, 10min, 20min) sequencing batch reactors, were set up in this study to explore the enrichment of sludge granulation and denitrifying phosphate-accumulating organisms (DPAOs) in different operation modes. The results showed that the post-short-term aeration reactor granular sludge had dense structure and good precipitation performance, which could enhance the storage of internal carbon source and secrete more eextracellular polymeric substance (EPS), and had higher nitrogen and phosphorus removal rate and DPAOs ratio. The biomass of R3was the highest and the average particle size was the largest (986μm) when the short-term aeration time was 10min. The particles were mature and stable. Batch experiment and three-dimensional fluorescence analysis showed that 45.85% of the phosphorus accumulating bacteria were DPAOs and EPS content was the highest. During stable operation, the COD, TN and TP removal rates of R3 were 94.13%, 89.41% and 96.11%, respectively, and the storage efficiency of internal carbon source was 98.09%, showing good treatment performance.

Key words： aerobic granular sludge nitrogen and phosphorus removal endogenous denitrification denitrifying phosphorus accumulating organisms

Received: 03 March 2023

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X703

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	ZHANG Jie
	YANG Jie
	LI Dong
	GAO Xin

Cite this article:

ZHANG Jie,YANG Jie,LI Dong等. Simultaneous nitrification and phosphorus removal of aerobic granular sludge in AOA-O mode[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5226-5234.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5226

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