三峡库区农村填埋垃圾渗滤液污染物含量评价

Evaluation of pollutants content in rural solid waste leachate in the Three Gorges Reservoir area

为了研究农村填埋垃圾渗滤液污染物含量和组成,选取了三峡库区10个垃圾填埋场渗滤液作为研究对象,对其无机阴离子、重金属含量及组成成分和pH值进行了分析.结果发现,垃圾填埋场渗滤液p H值均呈碱性,同时,SO_4^(2-)浓度均普遍高于Cl^-浓度.此外,受氧化还原电位和p H值的影响,呈现出NO_3^--N浓度<NO_2^--N浓度的分布趋势.通过指数和单因子评价法对填埋垃圾的重金属含量进行了分析和评价.结果表明,Cr无污染现象,但Cd污染现象普遍十分严重,Pb、Zn和Cu污染则在不同的地点呈现出空间差异性.研究表明,三峡库区农村填埋垃圾特异性高,污染物来源构成差异性大.

In order to study the content and composition of pollutants in solid waste landfill leachate in countryside, we chose 10 different solid waste leachate from Three Gorges Reservoir region as research objects. The content and composition of inorganic anions, heavy metal and pH values had been analyzed. It is found that the pH are alkalinic and the concentration of SO4^2- is higher than that of Cl^- in all solid waste leaehate. Furthermore, with the influence of the redox potential and pH, leaehate presents the following distribution trend：NO3^--N〈NO2^--N. The content of heavy metals in solid waste leachate were analyzed and evaluated through the exponential and the single factor evaluation methods. We came to a conclusion that there is no Cr pollution, but Cd pollution is quite serious, and the pollution of Pb, Zn and Cu show spatial difference in different locations. The results show that the specificity of solid waste is high and the composition of pollutant is different in the different locations of Three Gorges Reservoir region.