污水处理厂污泥中重金属污染及生态风险研究

Study on Heavy Metal Pollution and Ecological Risk in Sewage Treatment Plant Sludge

以忻州某污水处理厂为例,采用ICP-Ms分析了污泥中重金属Cd、Hg、Pb、Cr、As、Ni、Zn及Cu的含量,利用单因子污染指数法分析了其生态风险。结果表明:各个采样点重金属均能检出,其中各采样点重金属Cd、Cr均超标,Hg和Ni均未超标。单因子污染指数法表明重金属在各个采样点重金属Cd为重度污染,其余重金属污染水平均在轻污染及以下水平。

Taking a sewage treatment plant in Xinzhou as an example, the contents of heavy metals Cd, Hg, Pb, Cr, as, Ni, Zn and Cu in sludge were analyzed by ICP MS, and its ecological risk was analyzed by single factor pollution index method. The results show that heavy metals can be detected at all sampling points, in which the heavy metals Cd and Cr exceed the standard, and Hg and Ni do not exceed the standard. The single factor pollution index method shows that the heavy metal Cd in each sampling point is seriously polluted, and the pollution levels of other heavy metals are at the level of light pollution and below.