厌氧氨氧化UASB系统对氨氮的超量去除机制研究

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Abstract The UASB reactor was used to investigate the excess removal characteristics of NH₄⁺-N by the anaerobic ammonia oxidation system, the catalytic activity of related enzymes, and the bacterial community structure of the sludge with changing ratio of NO₂^--N/NH₄⁺-N. The results showed that as the concentration of influent NO₂^--N decreaseed, the removal of NH₄⁺-N by the reactor increaseed compared to the theory. When the supply of nitrite was stopped, the removal of NH₄⁺-N in the reactor reached up to 55mg/L. The removal of NH₄⁺-N was not due to the anaerobic ammonia oxidization by the SO₄^2- and Fe³⁺/EDTA complex from the feed water, but the aerobic nitration of NH₄⁺-N. The analysis of catalase determination combined with molecular biology technology showed that the oxygen required for aerobic nitrification came from influent water and catalase oxygen production. The activity of ammonia oxidizing bacteria (AOB) and anaerobic ammonia oxidizing bacteria (AnAOB) in the bottom sludge bed was better than that in the upper sludge bed. On the contrary, the activity of heterotrophic denitrifying bacteria (HDB) in the upper sludge bed was better than that in the bottom sludge bed, and the two parts of sludge bed synergistically converted NH₄⁺-N into N₂.

Key words： anaerobic ammonia oxidation nitrogen excess removal hydrogen peroxide catalase

Received: 10 March 2021

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X703

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	Articles by authors
	YUAN Lin-jie
	YUAN Lin-jiang
	CHEN Xi
	YANG Rui
	YU Li-ping
	WANG Gang
	HE Xiang-feng
	YANG Jiang-wei

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YUAN Lin-jie,YUAN Lin-jiang,CHEN Xi等. Mechanism of excessive removal of ammonia nitrogen by anammox UASB system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4686-4694.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4686

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