豫中平原区某城市生活垃圾填埋场地下水水质评价

Evaluation of Groundwater Quality of a Municipal Solid Waste Landfill in the plain of East Henan

以豫中平原某规范建设的城市生活垃圾填埋场为研究区,利用模糊综合评价法对其5个地下监控井进行水质评价,评价结果表明:该垃圾填埋场填埋区周围的1号本底监测井、5号污染扩散井评价结果均符合《地下水质量标准》(GB/T14818-2017)Ⅱ类水质标准,3号污染监视井评价结果符合Ⅲ类水质标准,4号污染监视井评价结果符合Ⅰ类,水质均较好,说明填埋场区的防渗系统使用完好;而2号污染扩散井的评价结果为Ⅴ类,水质极差,氨氮超标严重,与附近养殖场粪便排污、农田施肥、渗滤液调节池和处理站构筑物的渗漏均有关系,建议可用电学法对调节池的防渗系统进行检测。并加强渗滤液调节池的管理和定期监测地下水,防止对地下水造成污染。研究结果对于评价垃圾填埋场的运行对地下水的影响、有效实施跟踪评价具有重要意义。

The standardized municipal solid waste landfill in the plain of East Henan was selected to evaluate the water quality of its five underground monitoring wells byusing the fuzzy comprehensive evaluation method.The results showed that the No.1 background monitoring well and the No.5 pollution diffusion well around the landfill fill area have been evaluatedⅡwater categories standard of "Groundwater Quality Standard"(GB/T14818-2017),No.3 pollution monitoring has evaluated III water categories standard,and No.4 pollution monitoring has evaluated I water categorystandard,the water quality of these monitoring wells is better,indicating that the anti-seepage system in the landfill site is in good condition.The No.2 pollution diffusion well exceeded V categories standard.The water quality of No.2 well is extremely poor,ammonia nitrogen is excessively severe,and it is related to the leakage of manure in farms nearby,the fertilization of nearby farmland and the leakage of the leachate adjustment pool and the treatment station structure.Electrical method can be used to test the anti-seepage system of the regulating tank.The management of leachate conditioning tanks should be strengthened and groundwater should be monitored regularly to prevent contamination of groundwater.The result is of great significance for evaluating the impact of landfill operations on groundwater and effectively implementing tracking evaluation.