基于数值模拟的稀土矿区地下水修复方案优化  

Optimization of Pollution Remediation Plan in Rare Earth Mining Area Based on Numerical Simulation of Groundwater

作　　者：宋宝德 罗育池 韩奕彤 刘畅 秘昭旭 王先稳 SONG Baode;LUO Yuchi;HAN Yitong;LIU Chang;MI Zhaoxu;WANG Xianwen(Guangdong Provincial Academy of Environmental Science,Guangzhou 510045,China;Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality,Guangzhou 510045,China)

机构地区：[1]广东省环境科学研究院,广东广州510045 [2]粤港澳环境质量协同创新联合实验室,广东广州510045

出　　处：《环境科学与技术》2024年第11期88-96,共9页Environmental Science & Technology

基　　金：中央水污染防治资金项目(XMHT-2022-SS-FW847);广东省科技计划项目(2017B020236001)。

摘　　要：文章通过构建某离子型稀土矿区地下水流数值模型,模拟预测矿区地下水流场与径流特征,结合流场、流线等预测结果,优化地下水污染修复设计方案。原位阻隔帷幕长度由160 m调整为95 m,帷幕底部由20 m深度调整至深入相对隔水层0.5 m,水泥旋喷桩顶线由地表调整为114 m标高;原位化学耦合微生物注射井由均匀布设调整为在矿区重污染区域集中布设排井,保证修复期内地下水能全部流经原位注射修复区域;改进型可渗透反应墙长度由56 m调整为41.5 m,隔水墙深度至相对隔水层0.5 m,顶线标高自修复单元两侧延伸至101.4 m标高;考虑矿区内地下水溢出量,生态沟处理规模由232 m^(3)/d调整为262 m^(3)/d。通过优化,既保证矿区地下水污染修复设计方案的科学合理,又减少工程量节约成本,对同类地下水污染修复方案制定具有重要参考意义。By constructing a numerical model of groundwater flow in an ionic rare earth mining area,the flow field and run⁃off characteristics of groundwater were simulating and predicting.The design scheme for groundwater pollution remediation was thus optimized based on the prediction results of flow field and streamline.According to the optimized results,the length of the grout curtain was adjusted from 160 m to 95 m,and the depth was adjusted from 20 m to 0.5 m below the relative water⁃proof layer,and the top line was adjusted from the surface to 114 m elevation.The injection wells of in-situ chemical coupled microbial remediation engineering were adjusted from uniform layout to centralized layout in heavily polluted areas,ensuring that all groundwater in the remediation period can flow through the injection area.The length of the permeable reactive barri⁃ers was adjusted from 56 m to 41.5 m,the depth of the grout wall was increased to 0.5 m below the relative waterproof layer,and the top line elevation extended from the bottom of the repair unit to 101.4 m.Considering the amount of groundwater over⁃flow in the mining area,the scale of ecological ditch treatment was adjusted from 232 m^(3)/d to 262 m^(3)/d.After optimization,groundwater pollution remediation scheme was more scientific,reasonable,and low-cost,which has great reference signifi⁃cance for the formulation of similar groundwater pollution remediation schemes.

关 键 词：离子型稀土矿区 地下水流场 粒子追踪 污染修复 方案设计 

分 类 号：X523[环境科学与工程—环境工程]