龙头寺垃圾填埋场整治后的污染风险评价

Pollution Risk Assessment of the Governed Landfill in Longtoushi

垃圾填埋场是重要的环境污染源,威胁着生态安全和人类健康。垃圾填埋场整治已是必然。主要对整治后的龙头寺垃圾填埋场场地进行了污染风险评价,结果表明,该区域环境空气质量较好,满足居住区大气中有害物质的最高允许浓度要求;水体pH、DO、COD、BOD5、NH3-N、TP、石油类均满足III类水质标准要求,地表水环境质量现状良好。环境噪声昼间、夜间满足二类声环境要求;土壤有机质偏低,B、D、E区土壤pH略显碱性（垃圾场封场整治期间喷洒石灰所至）,C区及混合区土壤pH在6-9,未超标。土壤中重金属镍、汞、铬、镉、铅、砷含量满足《土壤环境质量标准》的二级标准,场区土壤未受到重金属的污染。环境风险分析表明,该土地整治后满足城市居住建设的用地要求。

Pollution risk assessment of the governed landfill in Longtoushi was carried out in this article.The results showed that the ambient air quality in this region was good,and it can meet the requirements of the allowable maximum concentration in the in atmosphere in the community.In water body,major indicators as pH,DO,COD,BOD5 and others can meet the class III water standards,and the environmental quality of Surface water was good.The intensity of the ambient noise in day and night can meet Class II noise standard.The content of soil organic matter was low,the soil was alkaline slightly in B,D and E districts（because of the sprayed lime） and in the C district and the mixed district the soil pH was between 6～9,which did not exceeded the standards.In the soil the contents of the heavy metals such as nickel,mercury,chromium,cadmium,lead and arsenic can meet the the class II standard of ＂Soil Environmental Quality Standards＂,so the soil in the landfill was not polluted by the heavy metals.The pollution risk assessment of the governed landfill indicated that the soil in this area can meet the requests of the urban residential building sites.