上海某生活垃圾填埋场对浅层地下水水质的影响

EFFECTS OF LANDFILL ON THE SHALLOW GROUNDWATER QUALITY IN SHANGHAI

垃圾填埋是目前处理城市生活垃圾普遍使用的方式,由此产生的垃圾渗滤液成为主要的地下水污染源.本文以上海市某生活垃圾填埋场作为研究对象,研究垃圾填埋对地下水的影响.通过监测该场地垃圾填埋前后2年内场区及周边地下水水质的变化情况,以垃圾填埋前调查区的地下水样品分析结果为本底值,采用本底法对地下水水质进行评价来判定地下水是否受到垃圾渗滤液的影响.评价结果显示,对于本研究的水质动态监测阶段,调查区内的浅层地下水水质暂未受到垃圾渗滤液的影响,个别监测井水质发生较大变化是由于填埋场施工建设过程中,破坏了监测井井盖及挖穿了井边含水层顶层.随着整个垃圾填埋场运行时间的延长,防渗漏措施的有效性以及垃圾渗滤液对周边地下水的影响还需要进一步研究.

Landfill is the common way to treat the municipal garbage at present. However, the leachate from the landfill is the main source of groundwater pollution. In this paper, a municipal landfill in Shanghai City is selected to study the effects on groundwater. Seven monitoring wells are set up in the field around the landfill site. The groundwater quality in the area was monitored for two years before and after the landfill. The water samples were taken as the background before landfill to evaluate the groundwater quality by using Background Method. The results show that the groundwater quality of the whole area is in a steady state. It is not affected by the leaehate from the landfill up to now, although there is a great change in the water quality of individual monitoring wells. The reason is that the lid of monitoring well was destroyed in the construction process, and the wellhead directly exposed to the external environment. With continuous landfill operation, the effects of leachate from the landfill on groundwater remain for future studies.