污泥中重金属赋存形态与生态风险评价

Speciation and Ecological Risk Assessment of Heavy Metals in the Sludge

为掌握生活污水污泥中重金属的污染状况与生态风险,以南方某城市27座生活污水厂的污泥为研究对象,分析了污泥中Hg、As、Zn、Cr、Cd、Ni的总量及赋存形态,采用潜在生态风险指数法(RI)和风险评价编码法(RAC)评价了污泥中各重金属的生态风险。结果表明,因评价对象不同,每种方法其结果可能会产生较大差异,但综合各方法评价结果可知,南方某城市生活污水厂污泥中Cd应作为首要关注的重金属污染物。

To reveal the pollution status and ecological risk of heavy metals in the sewage sludge,the sludge samples were collected from 27 sewage treatment plants in Southern China.The total concentrations and the fractions of Hg,As,Zn,Cr,Cd,Ni in the sludge were analyzed.The ecological risks of heavy metals in sludge were assessed based on the potential ecological risk index method(RI)and risk assessment code(RAC).The results showed that the results of each method may be quite different because of different evaluation objects,but the comprehensive evaluation results of each method can be known,Cd in the sludge of a domestic sewage plant in southern China should be taken as the main heavy metal pollutant.