不同材料对污染土壤重金属稳定化的影响

Effects of Different Materials on Stabilization of Heavy Metals in Contaminated Soils

以电镀厂复合重金属污染土壤为研究对象,分析了不同修复材料对土壤中重金属稳定化的影响,从而筛选出修复效果较好的单一材料。结果表明:(1)选用的20多种修复材料中对土壤Cu、Cr、Ni同时具有较好稳定化修复效果的主要是铁粉(4种不同粒径)、nano-HA(纳米羟基磷灰石)和硫化亚铁;(2)粒径为0.1μm的铁粉修复效果最佳,稳定30 d可以使污染土壤中Cu、Cr、Ni浸出浓度均下降70%以上。

In this paper,the composite heavy metal contaminated soil in electroplating factory was taken as research object,and the effect of different restoration materials on stabilization of heavy metals in contaminated soils was studied,so as to screen out the single material with better repair effect.The results showed that:(1)More than 10 kinds of repair materials had good stabilization remediation effect on soil Cu,Cr and Ni,which were mainly iron(four different sizes),nano-HA(nano hydroxyapatite)and ferrous sulfide.(2)The particle size of 0.1 micron iron powder was the best,and the stability of 30 days can decrease Cu,Cr and Ni leaching concentration in contaminated soil by more than 70%.