减压汇流式渗透性反应墙(PC-PRB)是一种绿色可持续的地下水原位修复技术.本研究基于地下水运动和污染物迁移数学模型,创新性地提出网格自适应细化算法,并开发了基于此算法的污染物对流-弥散数值模拟软件PRB-Trans;利用PRB-Trans解析了减压汇流过程对PC-PRB污染物捕集性能的影响规律;在给定模拟污染源条件下,与连续式PRB(C-PRB)相比,PC-PRB所需的PRB长度LPRB和PRB高度HPRB分别减少40.0%和70.0%;PC-PRB平面和剖面污染物处理效率分别增加102.9%和348.3%.影响因素探究结果表明,随着导水管长度Lp的增加,PC-PRB所需的LPRB和HPRB减少,但减少幅度逐渐降低,同时,PRB厚度HPRB显著增加,导致PRB填料体积增大.为避免此情况出现,建议Lp /LPRB比值小于2.此外,由于减压汇流井的混合调配功能和缓冲层的均匀布水功能,PC-PRB可有效解决C-PRB填料利用率低和局部击穿等问题,显示出其在地下水修复领域的应用潜力.
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 (LPRB) and PRB height (HPRB) 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 (Lp), the required LPRB and HPRB of PC-PRB decreased, but the reduction rate gradually decreased. Simultaneously, the PRB thickness (HPRB) increased significantly, leading to an increase in the PRB filler volume. To avoid this situation, it is recommended that the Lp/LPRB 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.
关键词
减压汇流 /
渗透性反应墙 /
数值模拟 /
污染物迁移阻控 /
影响因素分析
Key words
influencing factors analysis /
numerical simulation /
passive convergence /
permeable reactive barrier /
pollutant migration interception
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基金
国家重点研发计划项目(2018YFC1802300);中央级公益性科研院所基本科研业务专项(PM-zx703-202406-192)
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