减压汇流式PRB污染物迁移阻控性能研究

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Abstract Passive convergence-permeable reactive barrier (PC-PRB) is an eco-friendly and sustainable in-situ groundwater remediation technology. Based on mathematical models of groundwater flow and contaminant transport, this study innovatively proposed a grid self-adaptive refinement algorithm and developed a contaminant convection-diffusion numerical simulation software PRB-Trans. Utilizing PRB-Trans, the impact of the decompression convergence process on the contaminant capture performance of PC-PRB was analyzed. Under given simulation contaminant source conditions, compared with the continuous permeable reactive barrier (C-PRB), the required PRB length (L_PRB) and PRB height (H_PRB) of PC-PRB were reduced by 40.0% and 70.0%, respectively. The PC-PRB's planar and cross-sectional contaminant treatment efficiencies were increased by 102.9% and 348.3%, respectively. The results of the investigation of influencing factors show that with the increase of the drainage pipe length (L_p), the required L_PRB and H_PRB of PC-PRB decreased, but the reduction rate gradually decreased. Simultaneously, the PRB thickness (H_PRB) increased significantly, leading to an increase in the PRB filler volume. To avoid this situation, it is recommended that the L_p/L_PRB ratio is less than 2.In addition, due to the mixing and matching function of the decompression convergence wells and the uniform water distribution function of the buffer layer, PC-PRB can effectively solve the problems of low filler utilization rate and local breakthrough of C-PRB, demonstrating its application potential in the field of groundwater remediation.

Key words： permeable reactive barrier passive convergence pollutant migration interception numerical simulation influencing factors analysis

Received: 10 July 2024

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X523

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	Articles by authors
	ZHENG Kai-xuan
	LI Yi-hao
	LI Fu-li
	CHEN Ping
	OU Jie-yong
	LEI Lei
	CHEN Yan-zhi
	WANG Wei
	DING Jie
	PENG Xiang-qin
	LIU Na
	WEN Yong
	LIU Xiao-wen
	WANG Hong-tao

Cite this article:

ZHENG Kai-xuan,LI Yi-hao,LI Fu-li等. Study on the pollutant migration interception performance of passive convergence-permeable reactive barrier[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(2): 829-840.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I2/829

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