利用生物渗透性反应墙修复地下水Cr(VI)污染的数值模拟

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Abstract In order to reduce Cr(VI) in groundwater, the common electron donor (molasses) and dithionite in the biological reaction process were selected as the reactant and biocide of PRB, for the purpose of promoting the biochemical reaction to reduce Cr(VI) and preventing the bioclogging effect. PFLOTRAN software was adopted to simulate the biochemical reaction process of PRB with molasses as the reaction material and dithionite as the biocide to remove heavy metal pollutant in the heterogeneous aquifer. The results show that the PRB technique can reduce the Cr(VI) concentration to below 0.1mg/L; the bioclogging effect can be avoided by designing the concentration of biocide, injection rate and initial concentration of molasses, in order to achieve the dual goal of removing Cr(VI) and improving the longevity of PRB. The results of research can provide a decision-making basis for the optimal design plan of heavy metal contamination remediation in the groundwater for similar sites.

Key words： heavy metal pollution bioclogging permeable reactive barrier PFLOTRAN software

Received: 08 December 2021

PACS:

X523

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	Articles by authors
	DIAO Wen-qin
	SONG Jian
	WANG Lin
	WU Jian-feng
	LIU Yuan-yuan
	WU Ji-chun

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DIAO Wen-qin,SONG Jian,WANG Lin等. Numerical simulation of groundwater remediation of hexavalent chromium contaminated site by the bio-permeable reactive barrier[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3234-3243.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3234

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