固化剂对Cd污染土壤的固化效果研究

摘要

为研究Cd污染土壤固化/稳定化最优的药剂配比，以 Cd污染土壤为研究对象，通过正交试验向土壤中添加波特兰水泥，磷酸二氢钙，硅藻土和高岭土4种固化剂，以固化/稳定后土壤中 Cd 的浸出质量浓度为评价指标，确定最优的药剂配比。实验结果表明：对 Cd 的固化能力较好的是波特兰水泥，可减少 Cd 的浸出量65.9%。对 Cd最佳的药剂配比为：波特兰水泥与磷酸二氢钙的用量均为8.0‰，硅藻土的用量为6.0‰，高岭土的用量为4.0‰。%To study the optimal ratio of agents in solidifying/stabilizing Cd-contaminated soil,orthogonal experiments were conducted by adding curing agents,namely,Portland cement,monocalcium phosphate, diatomite,kaolin into Cd-contaminated soil,to determine an optimal agent mixing ratio by evaluating the leaching concentration of Cd in the solidified/stabilized soil.The main results of the experiments were as follows:Portland cement showed the best effect on reducing the leaching concentration of Cd by 65.9%. The best ratio of Cd were as follows:the amount of Portland cement,monocalcium phosphate,diatomite and kaolin were 8.0‰,8.0‰,6.0‰,4.0‰,respectively.