多种固化材料对重金属污染底泥稳定化的研究

Study on Effect of Immobilization Materials on Heavy Metal Stabilization Treatment in Sediment

采用毒性浸出方法,考察了固化材料生石灰、沸石、硅藻土、活性炭、磷酸二氢钾对底泥中重金属的稳定化效果。结果发现,当生石灰与磷酸二氢钾添加量为120 g/kg干底泥时,底泥中锰的浸出浓度下降了80%以上,镉的浸出浓度下降了90%以上,铅的浸出浓度下降了70%以上,铜的浸出浓度下降了85%以上,锌的浸出浓度下降了85%以上。

Several chemical immobilization materials, such as CaO, zeolite, diatomite, activated carbon and KHzPO4, were evaluated by leaching toxicity experiments to determine their effects on heavy metal stabilization in contaminated sediment. The results showed that after the treatment of 120 g/kg CaO and KHzPO4, the concentrations of Mn, Cd, Pb, Cu and Zn eluted reduced more than 80% , 90% , 70% , 85% and 85%.