水力截获技术在地下水污染修复中的应用——以某危险废物填埋场为例  

Application of Hydraulic Capture Technique in Groundwater Pollution Restoration——A Case from a Hazardous Waste Landfill

作　　者：顾栩 杜鹏 单慧媚[1,2] 马腾[1,2] 程胜高 

机构地区：[1]中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430074 [2]中国地质大学环境学院,湖北武汉430074 [3]中化地质矿山总局化工地质调查总院,北京100013

出　　处：《安全与环境工程》2014年第4期52-58,68,共8页Safety and Environmental Engineering

基　　金：高等学校博士学科点专项科研基金项目(20110145110003)

摘　　要：填埋场渗滤液引发的地下水污染问题日益严重,防渗失效情况下,如何采取有效措施阻止污染物扩散成为保护地下水的关键。本文以某危险废物填埋场为例,假设填埋场防渗结构完全失效,渗滤液随大气降雨连续入渗直接进入地下水,以Ni作为主要污染物,利用Visual MODFLOW模拟软件建立了Ni在地下水中迁移扩散的模型,预测其在地下水中的时空迁移扩散规律,并在此基础上,通过优化抽/注水井,建立有效的水力截获带对地下水污染进行修复。结果表明:六抽一注井群系统,单井抽水量为350m3/d时的修复效果最佳;水力截获技术可以直接将受污染水体抽除,将污染羽控制在拟建工程内部,以达到有效保护周围地下水环境的目的。The groundwater pollution caused by the landfill leachate gets worse nowadays.The contaminant diffusing prevention method is crucial to protect groundwater as the anti-seepage system fails to work.This paper takes a landfill site of hazardous wastes as a case study and chooses nickel as the major contaminant,assuming that when the anti-seepage system fails the leachate will continuously penetrate into the groundwater along with rainfall.Then the paper uses the Visual MODFLOW model to simulate the migration and diffusion of Ni within the groundwater in order to investigate its spatial and temporal distribution,and establishes an effective hydraulic capture zone by optimizing the extraction/injection wells.Data show that the six-extraction-one-injection well system has the best performance with the single-well water pumpage of 350m3d-1;this technique provides a route to pump out the contaminated water directly to control the contamination plume inside the proposed construction project and protects the nearby groundwater environment effectively.

关 键 词：地下水污染 水力截获技术 危险废物填埋场 数值模拟 抽注水系统 

分 类 号：X523[环境科学与工程—环境工程]