两种修复模式下CAHs污染地下水的原位对照

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Abstract To explore the long-term effectiveness and environmental response of in-situ remediation of chlorinated aliphatic hydrocarbon (CAHs) contaminated groundwater, a pilot comparison experiment of biostimulation and zero valent iron (ZVI)-biological stimulation coupling remediation strategies was carried out in a polluted area of an abandoned chemical plant in North China. The degradation efficiency of CAHs and the dynamic variations of biochemical parameters for groundwater under these two remediation modes were systematically compared. Total CAHs decreased to less than 50μg/L within 4~5 years after remediation under the two strategies. The coupling remediation strategies increased the overall degradation efficiency of CAHs without concentration rebound and improved the groundwater environment and provided favorable conditions for the growth of potential degrading bacteria. The long-term effects on the bacterial diversity of groundwater by using these two remediation strategies were basically the same, which were conducive to the evolution to Desulfobacterota and Chloroflexi. Finally, the total number of bacteria in the biostimulation pilot area was about one order of magnitude higher than the coupling remediation pilot area, but the number of dehalococcoidia in the latter groundwater (2.1~35)×10³ copies/mL was higher than the former (8.3~9.1)×10³ copies/mL, which was more conducive to the complete dechlorination of CAHs.

Key words： chlorinated aliphatic hydrocarbon groundwater remediation zero valent iron biostimulation biodiversity

Received: 22 March 2022

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X523

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	Articles by authors
	SONG Jiu-hao
	WU Nai-jin
	LI Pei-zhong
	ZHANG Ji
	LI Xiang
	RONG Li-ming
	WANG Hai-jian
	SONG Yun

Cite this article:

SONG Jiu-hao,WU Nai-jin,LI Pei-zhong等. In-situ comparation of CAHs contaminated groundwater under two remediation strategies[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4668-4675.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I10/4668

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