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| The seepage regulation mechanism of passive convergence-permeable reactive barrier |
| ZHENG Kai-xuan1, TAO Shi-yang1, DING Jie1, CHEN Di1, TAN Yi-qi2, LEI Lei1, CHEN Yan-zhi1, WANG Wei1, WEN Yong1, PENG Xiang-qin1, WANG Hong-tao2 |
1. State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Science, Ministry of Ecological Environment, Guangzhou 510655, China;
2. School of Environment, Tsinghua University, Beijing 100084, China |
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Abstract Passive convergence-permeable reactive barrier (PC-PRB) is a novel and sustainable in-situ remediation technology for contaminated groundwater. To evaluate the hydraulic capture performance of PC-PRB and reveal its seepage regulation mechanism, we developed a PRB-Flow simulation software with high accuracy of particle tracing algorithm and strong numerical solution stability. Under the specified simulation conditions, the PC-PRB exhibited an approximately 47% increase in planar capture flow rate and a 90% increase in sectional capture flow rate compared to the continuous permeable reactive barrier (C-PRB). Sensitivity analysis showed that the water pipe length Lp, the horizontal range of the passive well TDw and the passive well depth Hw were the key parameters affecting the hydraulic performance of PC-PRB. There was a significant positive correlation between Lp and the hydraulic capture performance of PC-PRB (P<0.01). Increasing TDw and Hw can enhance the hydraulic capture capacity of PC-PRB, but the influence degree was not as significant as Lp. The drainage and depressurization effect of the water pipe makes the head drop in the passive well, which drives the surrounding groundwater to converge into the well, thus significantly improving the hydraulic capture performance of PC-PRB. PC-PRB can effectively solve the local breakthrough problem of C-PRB caused by uneven flow velocity.
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Received: 13 March 2024
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