短程反硝化的启动及多参数优化下NO<sub>2</sub><sup>-</sup>-N积累特性

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Abstract Partial denitrification SBR reactors of R1, R2 and R3 were used to inoculate with anaerobic (S-A), aerobic (S-O) and alternate anaerobic/aerobic (S-A/O) activated sludge as seed sludge respectively which cultivated in our laboratory for a long time. When the influent C/N ratio was 3 and the anoxic stirring time was 1h, the nitrite accumulation rate (NAR) of the R1, R2, and R3 reactors reached 75.34%, 84.51% and 86.23% on the 15th, 7th and 4th day, respectively. Four factors and three levels response surface method experiments were conducted on NAR with C/N ratios, initial pH, anoxic stirring time and initial NO₃^--N concentration. The results of variance analysis showed that the above factors had significant effects on NAR (P<0.05), and R² of model was 0.983. The optimal operating conditions were predicted by the model as follows:C/N ratio was 3, initial pH was 8.51, anoxic stirring time was 1.25h, and initial NO₃^--N concentration was 60mg/L, NAR was as high as 91.3%.

Key words： partial denitrification nitrite accumulation rate C/N ratios parameters of partial denitrification response surface method

Received: 31 July 2020

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X703

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	MAO Pei-yue
	FU Xue
	ZHAO Xin-lei
	XING Jia-wei
	MA Jiao
	CHEN Yong-zhi

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MAO Pei-yue,FU Xue,ZHAO Xin-lei等. Start-up of partial denitrification and characteristics of nitrite accumulation by multiple factors[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1189-1198.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1189

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