城市垃圾填埋场重金属污染特征及其评价

Pollution characteristics and evaluation of heavy metals in municipal rubbish landfill sites

采用全面踏查和典型调查相结合的方法,对福建省南平市城市垃圾填埋场重金属Mn、Zn、Pb、Cd、Cr、N i的污染状况进行调查.结果表明:填埋2 a的垃圾填埋场重金属含量较低,填埋10 a的垃圾填埋场的重金属含量较高;垃圾渗滤液不同浸蚀时间土壤的重金属污染状况存在明显差异,浸蚀10 a土壤中重金属含量是浸蚀2 a土壤的3.24-8.34倍,而浸蚀10a土壤重金属含量则是对照的4.1-9.83倍;垃圾填埋场渗滤液的重金属污染也比较严重,其中Zn、Pb、Cd、Cr含量超过国家地面水环境质量标准(V类标准),Zn、Cd含量超过国家污水综合排放标准.

The pollution characteristics of heavy metals such as Mn, Zn, Pb, Cd, Cr and Ni in municipal rubbish landfill sites in Nanping of Fujian Province were analyzed and evaluated. The results were as follows ： the content of heavy metals in the soil of the landfill sites filling for two years was lower than that filling for ten years; there were significant differences among the heavy metal pollutions of the soil polluted by landfill leachate ; the content of heavy metal in the soil polluted by landfill leachate for ten years was 3.24 - 8.34 times as high as that for two years, and 4.1 - 9.83 times as high as that of the control; the content of Zn, Pb, Cd, and Cr in landfill leachate exceeded China national standards for ground water environment quality, and the content of Zn and Cd exceeded the China national standard of integrated wastewater discharge .