三峡库区垃圾渗滤液-城镇污水合并处理时的重金属含量研究

应用微波消解-电感耦合等离子体发射光谱法（ICP-OES）测定三峡库区垃圾渗滤液、渗滤液城镇污水合并处理厂进、出水以及剩余污泥中重金属元素的浓度。结果表明，合并处理后，除5个污水厂出水Ni超标（浓度为59.79～104.30 μg/L）外，其余重金属元素均低于GB 18918-2002污水排放标准；剩余污泥中的总重金属含量在15.31～27.73 g/kg之间，各元素含量均远低于污泥农用标准。因此，在目前各合并处理厂的运行条件下，控制渗滤液与城镇污水比例在1∶2 700～1∶50（V/V）范围内，渗滤液汇入生活污水进行合并处理是解决渗滤液重金属污染的有效方式。

Study on contents of heavy metals in leachate-sewage combined treatment plants in Three Gorge Reservior area

Microwave digestion coupled with inductively coupled plasma optical emission spectrometer(ICP-OES) was used to determine the concentrations of heavy metals in landfill leachate as well as influents,effluents and excess sludges of leachate-sewage combined treatment plants in Three Gorge Reservior area.Results showed that among all the heavy metals,Ni in 5 effluents at levels between 59.79 and 104.30 μg/L were beyond the discharge standard of guideline GB 18918-2002.In excess sludges,the total concentrations of heavy metals ranged from 15.31 to 27.73 g/kg while each individual heavy metal concentration met the standard of farm application.So under the current operational conditions,with the leachate/sewage ratio between 1∶2 700 and 1∶50(V/V),leachate-sewage combined treatment is an effective method to solve heavy metal contamination of landfill leachate.