减压汇流式PRB污染物迁移阻控性能研究  

Study on the pollutant migration interception performance of passive convergence-permeable reactive barrier

作　　者：郑凯旋 李义豪 李富丽 陈平[3] 区杰泳 雷蕾 陈岩贽 王炜 丁洁 彭香琴 刘娜[2] 温勇 刘晓文 王洪涛[4] 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(State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment,South China Institute of Environmental Science,Ministry of Ecological Environment,Guangzhou 510655,China;College of Life Science and Technology,Jinan University,Guangzhou 510632,China;School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Environment,Tsinghua University,Beijing 100084,China)

机构地区：[1]生态环境部华南环境科学研究所,国家环境保护环境污染健康风险评价重点实验室,广东广州510655 [2]暨南大学生命科学技术学院,广东广州510632 [3]广东工业大学环境科学与工程学院,广东广州510006 [4]清华大学环境学院,北京100084

出　　处：《中国环境科学》2025年第2期829-840,共12页China Environmental Science

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)。

摘　　要：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L_(PRB)和PRB高度H_(PRB)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L_(p)的增加,PC-PRB所需的L_(PRB)和H_(PRB)减少,但减少幅度逐渐降低,同时,PRB厚度H_(PRB)显著增加,导致PRB填料体积增大.为避免此情况出现,建议L_(p)/L_(PRB)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.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.

关 键 词：渗透性反应墙 减压汇流 污染物迁移阻控 数值模拟 影响因素分析 

分 类 号：X523[环境科学与工程—环境工程]