宁蒗县城生活垃圾填埋场地下水污染调查及风险评价  

GROUNDWATER POLLUTION INVESTIGATION AND RISK ASSESSMENT OF DOMESTIC GARBAGE LANDFILL IN NINGLANG COUNTY

作　　者：肖志才 李阳辉 孟菲 XIAO Zhi-cai;LI Yang-hui;MENG Fei(Lijiang Teachers College,Lijiang 674199,Yunnan,China;Ecological Environment Monitoring Station of Ninglang County,Lijiang 674300,Yunnan,China;Lijiang Ecological Environment Monitoring Station,Department of Ecological Environment of Yunnan Province,Lijiang 674100,Yunnan,China)

机构地区：[1]丽江师范高等专科学校,云南丽江674199 [2]宁蒗县生态环境监测站,云南丽江674300 [3]云南省生态环境厅驻丽江市生态环境监测站,云南丽江674100

出　　处：《云南地理环境研究》2023年第2期1-6,34,共7页Yunnan Geographic Environment Research

基　　金：云南省教育厅科学研究基金项目“丽江近郊温泉地热资源保护及开发利用研究”(2023J1736)。

摘　　要：宁蒗县城生活垃圾填埋场周边地下水类型主要为碎屑岩和火成岩裂隙水,均为中等渗透性能。地下水水质检测结果显示,填埋区和渗滤液调节池第四系含水层的超标项目较多、超标倍数更大;而填埋区下游第四系和火成岩基岩裂隙含水层中除总大肠杆菌群、NH_(3)-N、Cr^(6+)和Fe超标外,别的指标均未超标。通过计算验证垃圾渗滤液1年后可以穿透包气带到达基岩裂隙含水层中,进而造成地下水污染。对填埋场污染特征及含水层脆弱性的研究表明,填埋场总体属于“较高”污染风险等级。其中,垃圾类型、场地规模、顶部覆盖、底侧部防渗等为主要影响因素。而填埋场含水层总体脆弱指数属于“容易污染”类型。其中,地下水位、含水层介质和包气带介质等为主要影响因素。It was found that the main types of groundwater in the landfill area are fissure water with medium permeability of clastic rock and igneous rock.The water quality test of groundwater exposed by drilling shows that there are more items exceeding the standard in the quaternary aquifer of landfill area and leachate regulating tank,and the multiple of exceeding the standard is larger.However,in the fractured aquifer of Quaternary and igneous basement of the landfill area,other indexes did not exceed the standard except TDS,NH_(3)-N,Cr^(6+)and Fe.The calculation results also verify that landfill leachate can penetrate the vadular zone to the fractured bedrock aquifer after one year,and then cause groundwater pollution.Through the study on the characteristics of landfill pollution and the vulnerability of aquifer,it is shown that the landfill belongs to“high”pollution risk level.Among them,risk factors such as garbage type,site scale,top cover and seepage prevention of bottom side are the main influencing factors.The overall vulnerability index of landfill aquifer belongs to the“easy pollution”type.The vulnerability factors such as groundwater level,aquifer medium and vadiscal medium are the main influencing factors.

关 键 词：垃圾填埋场 垃圾渗滤液 地下水污染 水质检测 

分 类 号：X523[环境科学与工程—环境工程] X501