Fe<sub>3</sub>O<sub>4</sub>对含盐废水厌氧处理系统的影响

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Abstract The salinity was stepwise increased at fixed hydraulic retention time of 24h, two parallel anaerobic reactors with and without Fe₃O₄ were applied to investigate the influence of Fe₃O₄ on operational performance and sludge granulation of anaerobic system. The addition of Fe₃O₄ could effectively enhance the anaerobic treatment efficiency and ensure the stable operation at all tested salinity. The improvement of Fe₃O₄ on methane yield differed significantly at salinity varying from 0~2%. At salinity of 0, 0.5%, 1% and 2%, the methane yield of Fe₃O₄-supplemented reactor was 1.08, 1.36, 1.3 and 1.17-fold of the contrast reactor, the enhancement of Fe₃O₄ on methane yield was more significant under low salinity. In addition, the sludge properties and extracellular polymer substances secretion during the operation process were simultaneously analyzed as well. The results showed that the addition of Fe₃O₄ facilitated the formation of closely-packed anaerobic granular sludge, thus enhanced the anaerobic granulation process. According to the microbial community structure analysis, hydrogenotrophic methanogens were rapidly enriched with the increase of salinity, while the main bacterial consortium and metabolic pathways were changed as well. The effects of Fe₃O₄ on the microbial community structure and metabolic pathway of anaerobic system were also observed obviously distinct under low salinity (0.5%) and high salinity (1%, 2%).

Key words： ferroferric oxide saline wastewater anaerobic granule sludge UASB reactor microbial community structure

Received: 20 April 2022

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X703

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	Articles by authors
	MA Kai-li
	WANG Wei
	LIU Yu-qing
	YAN Meng-yi
	CUI Yan-rui
	KANG Wei
	CAO Zhi-guo

Cite this article:

MA Kai-li,WANG Wei,LIU Yu-qing等. Influence of Fe₃O₄ on the anaerobic treatment system of saline wastewater[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5128-5135.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5128

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