摘要
为研究城市垃圾填埋场工程的环境及经济效应,以安徽省北部地区某城市城区某垃圾填埋场工程为例,利用GMS软件建立地下水渗流与溶质迁移三维耦合数值模型,考虑污染扩散趋势以及后期自然衰减的作用,通过模拟填埋场垃圾渗滤液泄漏后Cl-在地下水中的迁移过程以及在不同污染防控工程措施下迁移的情形,比较了其效果、工程量和成本等指标,并提出合理化建议。结果表明,自然条件下,20年后迁移距离约为400 m,到达下游城区饮用水井;当以HDPE土工膜—膨润土复合墙进行垂直防渗帷幕工程后,以HDPE土工膜进行地面封场,区域监测井Cl-浓度均低于地下水Ⅲ类标准值,控制效果显著。通过对比分析不同工程措施的效果、工程量及经济成本,最终建议采用以HDPE土工膜进行地面封场与以HDPE土工膜—膨润土复合墙作为下游区域垂直防渗帷幕的组合方案。
To study the environmental and economic effects of urban landfill engineering,taking a landfill engineering project in a certain urban area of northern Anhui province as an example,a three-dimensional coupled numerical model of groundwater seepage and solute migration was established using GMS software.The trend of pollution diffusion and the effect of natural attenuation in the later stage were considered,By simulating the migration process of Cl-in groundwater after leakage of landfill leachate and under different pollution prevention and control engineering measures,the effectiveness,engineering quantity,cost and other indicators were compared,and reasonable suggestions were proposed.The results show that under natural conditions,the migration distance after 20 years is about 400 meters,reaching the drinking water wells in the downstream urban area;When HDPE geomembrane bentonite is used for vertical antiseepage curtain engineering,and HDPE geomembrane is used for ground sealing,the Cl-concentration in regional monitoring wells is lower than the class III standard value of groundwater,and the control effect is significant.By comparing and analyzing the effects,quantities,and economic costs of different engineering measures,it is ultimately recommended to adopt a combination scheme of HDPE geomembrane for ground sealing and HDPE geomembrane bentonite as the vertical anti-seepage curtain for downstream areas.
作者
刘能胜
曹恒明
LIU Nengsheng;CAO Hengming(Hubei Water Resources Technical College,Wuhan 430070,China;Yancheng Library,Yancheng 224005,China)
出处
《环境影响评价》
2024年第1期49-56,共8页
Environmental Impact Assessment
