不同物料对Cu、Zn、Hg、Cd污染土壤修复效应

Effects of Different Materials on Remediation of Cu,Zn,Hg and Cd Contaminated Soils

为了探索修复重金属污染土壤的有效方法,采用铁矿粉、煤矸石、磷矿粉、风化煤、硅藻土、木醋、壳聚糖对Cu、Zn、Hg、Cd污染的土壤进行处理。结果表明,大部分物料在添加5周后,土壤中重金属有效态含量逐渐趋于稳定;土壤添加物料7周后,风化煤和磷矿粉均能显著降低土壤中有效态Cu含量,分别降低了73%和49%;铁矿粉和风化煤对土壤中Zn有着较好的固化效果,分别使土壤中有效态Zn含量减少了82.2%和72.6%;硅藻土和铁矿粉均能有效降低土壤中Hg的有效态含量,降低量分别达51.7%和48.5%;硅藻土对土壤中的Cd有着良好的固化效果,土壤中有效态Cd的降低量为51.3%;壳聚糖则在一定程度上增加了土壤中有效态Cu、Zn、Hg的含量。该研究为修复4种重金属污染的土壤提供一定的数据支持和方法参考。

Soils contaminated with Cu, Zn, Hg and Cd were treated with iron ore powder, gangue, phosphate rock, weathered coal, diatomaceous earth, wood vinegar and chitosan to explore the effective ways of remediation. The results showed that the contents of available heavy metals in the soil gradually stabilized after 5 weeks of materials＇ addition. After 7 weeks, the contents of available Cu in the soils were significantly decreased by weathered coal and phosphate rock, and the reduction rates were 73~ and 49 respectively; the iron ore powder and the weathered coal had good curing effect on Zn in soil,which could reduce the available Zn contents by 82. 2~ and 72. 6M; Both diatomite and iron ore could effectively reduce the available Hg in soil and the reduction rates were 51.7~ and 48. 5~; The diatomite had good curing effect on Cd in soil, the available Cd in soil was reduced by 51. 3~/6o. Chitosan could increase the contents of Cu, Zn and Hg in the soil to certain extents. This study provides some data support and method reference for remediation of the four heavy metal contaminated soils.