杨凌城市污泥重金属环境风险评价及合理施用量研究

Environmental Risk Assessment of Heavy Metals and Rational Application Rate of Sewage Sludge in Yangling

为科学确定污泥施用量和评价污泥中重金属的环境风险,根据重金属不同形态的环境效应引入毒性响应系数确定了污泥的合理施用量,并采用单项污染指数、内梅罗综合指数和地积累指数对污泥中重金属的污染程度进行了评价。初步确定杨凌城市污泥合理施用量为4.04 t/(hm2·a),Cd是限制该地区污泥施用的最主要因素,该方法突出了重金属形态的重要性,弥补了以往对重金属只进行总量控制的不足。

In order to determine the sewage sludge application rate scientifically,the toxic response factor of different forms of heavy metals was applied.Single pollution index,Nemerow pollution index and Geo-accumulation pollution index was used to assess the environmental risk of heavy metals in sewage sludge.Rational application rate of sewage sludge in Yangling was 4.04 t/（hm2 · a）,and Cd was the most important element to restrict application of sewage sludge in this area.This method stressed the importance of the forms of heavy metals and made up for the shortage of only controlling the total amount of heavy metals in the past.