利用羟胺实现城市污水短程硝化最优投加点选择

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Abstract In this study, a sequencing batch reactor (SBR) treatment system operating in anoxic/aerobic (A/O) mode was established, and the optimization of hydroxylamine dosing point on partial nitrification of municipal wastewater was explored. Results of batch experiments showed that the presence of dissolved oxygen could reduce the inhibitory effect of hydroxylamine on NOB by (20±0.5)%. In addition, compared with the treatment without anoxic condition and extended anoxic duration (>15min), the activity inhibited ratio of NOB increased by 13%~25% with anoxic duration of 1~5min. The long-term experiments showed that the NO₂^--N accumulation rate of the partial nitrification system with hydroxylamine addition at the end of anoxic stage maintained above 92%, while it decreased gradually with hydroxylamine at aerobic stage. QPCR analysis showed that the inhibition on ammonia oxidizing bacteria (AOB) could be reduced with sufficient inhibition on NOB when the hydroxylamine was added at the end of anoxic period, facilitating the dominance of AOB in microbial community structure. This study provides a theoretical basis for optimizing hydroxylamine dosing point and maintaining stable partial nitrification process.

Key words： hydroxylamine municipal wastewater partial nitrification dosing point anoxic/aerobic (A/O) mode

Received: 19 January 2021

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X703

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	XU Hao-tian
	ZHANG Shu-jun
	DURui
	PENG Yong-zhen

Cite this article:

XU Hao-tian,ZHANG Shu-jun,DURui等. Selection of optimal dosing point for partial nitrification of municipal wastewater by hydroxylamine[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3576-3583.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I8/3576

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