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以湖南郴州东江湖风景区矿区遗留地重金属污染土壤为研究对象,研究了3种含P材料,及其与蒙脱石的组合材料,对矿区土壤铅镉污染的修复效果。实验设6组处理,分别为P1组、P2组、P3组、P1+M组、P2+M组、P3+M组,通过添加5%的稳定剂,稳定2d后,分析土壤中铅镉的形态变化。实验结果表明:添加含P材料,及组合材料后,土壤中铅镉的离子交换态、铁锰结合态、有机结合态大幅度降低,残渣态显著升高。对Pb离子转化效果均在90.00%以上,Cd离子的转化效率相对较差,最优P1处理效果为74.20%。离子交换态的减少,有效地降低了重金属的生物有效性,有效地降低了环境风险。同时,含P材料均增加了土壤有效磷的含量,对矿区土壤的肥力也有一定提升。
Taking the residual heavy metal contaminated soil left in the mining area of Dongjiang Lake Scenic Area, Chenzhou, Hunan Province as the research object, the effects of three kinds of P - containing materials and their combined materials with montmorillonite on the restoration of lead and cadmium in the mining area were studied. The experiment was divided into six groups: P1 group, P2 group, P3 group, P1 + M group, P2 + M group and P3 + M group. The stability of Pb and Cd in soil was analyzed by adding 5% Morphological changes. The experimental results show that after the addition of P-containing materials and composite materials, the ion exchange states, the Fe-Mn bound states and the organic bound states of Pb and Cd in the soil are greatly reduced and the residual state is significantly increased. The conversion efficiency of Pb ions was over 90.00%, and the conversion efficiency of Cd ions was relatively poor. The optimal treatment effect of P1 was 74.20%. The reduction of ion exchange state effectively reduces the bioavailability of heavy metals and effectively reduces the environmental risk. At the same time, P-containing materials increased the content of soil available phosphorus, and also improved soil fertility in the mining area.