出水回流对Anammox颗粒特性及其微生物群落的影响

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Abstract From the perspectives of mass transfer, anammox activity and stability, this study evaluated the effect of effluent reflux on the structure and function of Anammox granular sludge (AnGS) in EGSB reactor with or without reflux. The results showed that increased reflux provided better flow conditions, which enabled the substrate to better contact with granular sludge. When nitrogen load rate ranged from (3.16to 3.79) kg/N·(m³·d), the original removal rates of nitrite (60%) and ammonia nitrogen (65%) were increased to more than 95% and the specific anammox activity increased by 31.54%. With the increased gas production and granular activity by reflux, the internal pressure of bubbles in AnGS was increased due to the limited pore volume. The microstructure of AnGS was changed and the porosity of AnGS was increased from 41.3% to 59.4%. In addition, the higher shear force and better mass transfer effect caused by effluent reflux greatly improved the stability of AnGS. The effluent reflux maintained and enriched candidatus-Jettenia in the seed AnGS, and enabled some bacteria maintaining the stability of the AnGS and improving viability. The internal porous structure and efficient nitrogen removal of the AnGS (such as Simplicispira) leads to better stability (such as Rheinheimera), which is conducive to the stable operation of AnGS in practical engineering applications.

Key words： anammox granular sludge effluent reflux mass transfer pore structure microbial community

Received: 03 September 2021

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X703

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	FU Hui-min
	LENG Ji-xuan
	WENG Xun
	YAN Peng
	CHEN You-peng

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FU Hui-min,LENG Ji-xuan,WENG Xun等. The effects of effluent reflux on characteristics and microbial community of anammox granular sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1663-1671.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1663

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