NO2--N/NH4+-N及COD/NH4+-N对厌氧氨氧化耦合反硝化脱氮除碳的影响

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Abstract The Sequencing Batch Reactor-Anaerobic Sequencing Batch Reactor (SBR-ASBR) combined process was used to treat actual domestic sewage with low C/N ratio at normal temperature,the partial nitritation was achieved by regulating SBR hypoxia: aerobic time was 80min:60min, 120min:60min and 150min:60min respectively. Then the effluent was pumped into the ASBR reactor,investigate the effect of different influent NO₂^--N/NH₄⁺-N and COD/ NH₄⁺-N on removal of nitrogen and carbon by anaerobic ammonia oxidation coupled denitrification, and response surface methodology was used to design orthogonal batch test. The results showed that: NO₂^--N/NH₄⁺-N was 1.55 and COD/NH₄⁺-N was 4.22, the effluent concentrations of NH₄⁺-N, NO₂^--N and COD were 2.79, 0.47 and 38.37mg/L respectively, and their removal rates were as high as 87.56%, 98.45% and 62.69% respectively. ΔNO₂^--N/ΔNH₄⁺-N was 2.23, the quantity of generated NO₃^--N was smaller than the theoretical value by 2.47mg/L, nitrogen was removed by the joint action of anammox and denitrifying, the nitrogen and carbon removal performance of the system was best. When NO₂^--N/NH₄⁺-N and COD/NH₄⁺-N increased from 0.84 to 1.55 and 3.24 to 4.22, respectively, the contribution of anammox and heterotrophic denitrification to nitrogen removal decreased from 80.40% to 53.33% and 19.60% increased to 46.67%. NO₂^--N/NH₄⁺-N and COD/NH₄⁺-N had significant interactive effects on the removal of TN and COD, and both showed a positive correlation, R² were 0.9243 and 0.9700 respectively.

Key words： semi-nitrosation ratio of anoxic and aerobic anaerobic ammonia oxidation and denitrification removal of nitrogen and carbon response surface analysis

Received: 23 October 2020

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X703

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

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ZHAO Xin-lei,XING Jia-wei,FU Xue等. Effect of NO₂^--N/NH₄⁺-N and COD/NH₄⁺-N on anaerobic ammonia oxidation coupled denitrification nitrogen and carbon removal[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2586-2594.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2586

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