【摘要】 为了解污泥中重金属污染状况,分析了合肥市5家污水处理厂污泥中As、Cd、Cr、Cu、Pb和Zn的总量、形态特征与生物毒性,并采用内梅罗指数法和潜在生态危害指数法对污泥中重金属生态风险进行了评价。结果表明,污泥中各重金属元素总量为Zn(639.00~2 094.50mg/kg)>Cu(107.22~415.86mg/kg)>Cr(48.06~388.24mg/kg)>Pb(4.50~35.40mg/kg)>As(11.72~47.51mg/kg)>Cd(2.02~16.68mg/kg)。形态分布特征分析结果显示,Cr、Cu和Pb较稳定,As的稳定性相对较差,Zn在污泥中稳定性最差,而Cd在不同污泥样品中的形态分布差异较大;水平振荡法和毒性特征沥滤方法对污泥中重金属浸出浓度较低,未超过相应限值。内梅罗综合污染指数法和潜在生态危害指数法对污泥中重金属总量评价结果表明,5家污水处理厂(分别命名为WT、WXY、JKQ、ZZJ、CTP)污泥样品表现为CTP>JKQ>WXY>ZZJ>WT,各重金属元素污染顺序为Cd>Cu(Zn)>As>Cr>Pb。更多还原

【Abstract】 The total contents,distribution characteristics and toxicities of heavy metals in different sludge from Hefei municipal wastewater treatment plants were analyzed,and the Nemerow index and potential ecological risk index method were used to evaluate the potential ecological risk of heavy metals in the sludge.Results showed that the amount scope and orders of heavy metal element content in the sludge were Zn(639.00-2 094.50 mg/kg)>Cu(107.22-415.86mg/kg)>Cr(48.06-388.24mg/kg)>Pb(4.50-35.40mg/kg)>As(11.72-47.51mg/kg)>Cd(2.02-16.68mg/kg).Distribution characteristics of heavy metal elements suggested that Cr,Cu and Pb were fairly stable,the stability of Zn in sludge was the worst,and the speciation of Cd in different sample was varied.Concentrations of heavy metal in the sludge leached by HJ and TCLP methods were low and did not exceed the standard limits.Besides,the Nemerow index and potential ecological risk index were assessed on the total contents of heavy metal in the sludge,which indicated that the orders of ecological risk on different samples were CTP>JKQ>WXY>ZZJ>WT,and the orders of pollution degree were Cd>Cu(Zn)>As>Cr>Pb.更多还原