活性污泥体系中C/N/S对硝酸盐还原过程的影响

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Abstract The effect of different electron donors (organics or S^2-) on denitrification and nitrate nitrogen reduction to ammonium (DNRA) was explored by adjusting inlet C/N and S/N ratios in an activated sequencing batch reactor (ASBR). The results showed that higher C/N ratios improved denitrification process, while higher S/N ratios were more beneficial to DNRA process. NH₄⁺-N, the characteristic product of DNRA, greatly yielded when C/N/S were 2:2:3 and 2:2:4, with the highest effluent NH₄⁺-N concentration of 10.65mg/L at C/N/S of 2:2:4. It indicated that when the electron acceptor was limited, the excess electron donor could increase the activity of DNRA and promote the conversion of denitrification to the DNRA process. 16SrRNA microbiological analysis clarified that Proteobacteria, Anaerolineae, Bacteroidia as well as Actinobacteria were closely related with nitrate reduction process, and Actinobacteria was corelated with the DNRA. Overall, this study provided alternative strategies for the simultaneous removal of carbon, nitrogen, and sulfur in the sewage treatment process.

Key words： activated sequencing batch reactor (ASBR) electrondonor denitrification dissimilatory nitrate reduction to ammonium (DNRA) C/N/S

Received: 31 August 2020

PACS:

X703.1

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	Articles by authors
	ZHANG Peng-cheng
	LI Xiao-ling
	WANG Xiao-ting
	ZHANG Yu-hao
	ZHANG Jia-ying
	LIU Xin-yi
	ZHANG Wen-bo

Cite this article:

ZHANG Peng-cheng,LI Xiao-ling,WANG Xiao-ting等. Effect of C/N/S on nitrate reduction process in activated sludge system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(5): 2117-2122.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I5/2117

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