地下水阻隔墙对湖南某生活垃圾填埋场地下水污染源头减量的模拟研究  

Simulation study on the reduction of groundwater pollution at the source of a municipal solid waste landfill in Hunan by groundwater barrier wall

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作  者:凌波 帅焕 陈婉君 孙杨艳 张海忠 欧阳琦 LING Bo;SHUAI Huan;CHEN Wanjun;SUN Yangyan;ZHANG Haizhong;OUYANG Qi(Hunan Province Hydrogeological Environmental Geological Survey and Monitoring Institute,Changsha 412000,Hunan,China;School of Hydraulic and Environmental Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China)

机构地区:[1]湖南省水文地质环境地质调查监测所,湖南长沙412000 [2]长沙理工大学水利与环境工程学院,湖南长沙410114

出  处:《矿产与地质》2024年第6期1109-1119,共11页Mineral Resources and Geology

基  金:湖南省地质院基金项目(HNGSTP2022);湖南省自然科学基金青年项目(2023JJ40021);湖南省教育厅青年项目(21B0314)共同资助。

摘  要:湖南垃圾填埋场大部分属于山谷型生活垃圾填埋场。由于山谷型生活垃圾填埋场的地下水径流通道及补给条件相对单一,选择地下水污染“源头减量”的方法进行治理。以湖南某典型山谷垃圾填埋场为研究对象,利用GMS软件结合该填埋场的水文地质条件,建立地下水流场和污染物迁移数值模型,模拟分析对比设置地下水阻隔墙前后该填埋场地下水流场以及污染物迁移的变化,并结合监测数据,分析评价上游设置地下水阻隔墙对垃圾填埋场“源头减量”污染治理的效果。结果表明:采用上游设置防渗墙+导排管引流“源头减量”的方式对该类垃圾填埋场的地下水污染治理有一定的效果;修建地下水阻隔墙后地下水流场上游地下水水位有较大幅度上升,出现较为明显的地下水雍堵,下游地下水水位下降明显,阻隔墙后断面地下水径流量变小,减少了需处理的垃圾填埋场受污染的膜下水量;地下水导排管涌水量与降水量具有相同的变化趋势。总体上,当导排管涌水量增加时,COD的含量呈现降低状态。Most of the waste landfills in Hunan are valley-type municipal solid waste landfills.Due to the relatively singular pathways and replenishment conditions of groundwater seepage in valley-type municipal solid waste landfills,the method of "source reduction" for groundwater pollution control is selected for management.Taking a typical valley landfill in Hunan as the research subject,the study uses GMS software combined with the hydrogeological conditions of the landfill to establish a numerical model of groundwater flow and contaminant migration.The model simulates and compares the changes in the groundwater flow and contaminant migration of the landfill before and after the construction of a groundwater barrier wall,and evaluates the effectiveness of the upstream groundwater barrier in "source reduction" pollution control for the landfill based on monitoring data.The results show that:The method of setting up an upstream seepage wall + drainage pipe for "source reduction" has a certain effect on the management of groundwater pollution in this type of landfill;after the construction of the groundwater barrier wall,there is a significant increase in the upstream groundwater level,with a noticeable blockage of groundwater,and a significant decrease in the downstream groundwater level,reducing the amount of water that needs to be treated from the polluted membrane below the landfill;the groundwater flow rate across the barrier wall decreases after the groundwater barrier wall,reducing the amount of polluted water from the landfill that needs to be treated;the seepage pipe discharge volume has the same trend of change as the precipitation volume.Overall,when the seepage pipe discharge volume increases,the concentration of COD shows a decreasing trend.

关 键 词:地下水阻隔墙 山谷型垃圾填埋场 源头减量 地下水污染 数值模拟 湖南 

分 类 号:X523[环境科学与工程—环境工程]

 

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