沼渣与硫酸亚铁共处置含铬土壤的协同机制研究

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Abstract Digestate and ferrous sulfate were combined to co dispose the chromium-containing soil, the synergistic effect of co-disposal was verified after the preliminarily optimizing of disposal parameters, and the synergistic mechanism was revealed by XPS analysis and microbial community analysis. Co-disposal of digestate and ferrous sulfate could reduce the content of Cr (VI) in soil to undetected (the detection limit was 0.2mg/kg), which was better than that with ferrous sulfate treatment, and the reduction rate of co-dispose was higher than that of digestate alone. The analysis of microbial community structure showed that the abundance and diversity of bacterial community in co-dispose group was higher than that in digestate alone, and the relative abundance of chromium reducing bacteria, iron reducing bacteria and sulfate reducing bacteria was significantly increased in the co-dispose soil. XPS analysis showed that Fe(Ⅱ), sulfites and sulfides were present in the soil after co-dispose. Combined with the results of microbial community analysis, the process of microbial catalytic reduction of Cr (VI) in digestate by iron and sulfur was confirmed. This study provides a new idea for the treatment of low carbon high concentration Cr (VI) contaminated soil.

Key words： ferrous sulfate digestate hexavalent chromium synergistic effect microbial community structure

Received: 13 September 2021

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X53

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	Articles by authors
	LI Rong-qiang
	WANG Shuai
	ZHANG Hai-xiu
	SHA Fu-jian
	ZHANG Da-lei
	ZHAO Jian-wei
	SUN Ying-jie

Cite this article:

LI Rong-qiang,WANG Shuai,ZHANG Hai-xiu等. Investigation on the oynergistic mechanism of co-disposal of chromium-containing soil by digestate and ferrous sulfate[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2229-2237.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/2229

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