复合污染沉积物中重金属的稳定化研究

Study of Immobilization of Multi-heavy Metal Contaminated Sediments

以CaCO3、Fe(OH)3、Ca(H2PO4)2、MgO为稳定试剂,模拟复合污染的沉积物进行稳定化处理,运用毒性浸出方法(TCLP)评价沉积物中重金属的稳定化效果.实验结果表明:4种稳定剂不同程度提高了沉积物中重金属的稳定化效率.其中,CaCO3对Cu的稳定效率最高达到50.01%,对Pb的稳定效率最高为42.21%;Ca(H2PO4)2对Pb的稳定效率最好,最高可达90%以上,但对Ni未见明显的稳定效果;Fe(OH)3对As具有较好的稳定效果,稳定效率可达68.44%;MgO对Cu和Pb最高稳定效率为80%以上.

With CaCO3,Fe （OH）3,Ca （H2PO4）2,MgO for immobilization materials,the heavy metal immobilization treatment of multi-heavy metal contaminated sediments were investigated through TCLP method. The results of TCLP method indicated that all the immobilization materials had an effect in heavy metal immobile efficiency. Under the treatment of CaCO3 the efficiency of Cu and Zn was able to reach 50. 01% and 42.21%. Ca（ H2PO4 ）2, for Pb, stabilization efficiency was preferably up to 90 % or more, but no significant stabilizing effect on the Ni;Fe （OH）3 had a good effect on As, and it could reach 68.44 % ;Under the treatment of MgO the efficiency of Cu and Pb reached 80 %.