土壤重金属复合污染的化学固定修复研究

本文研究糠醛渣、磷矿粉、风化煤3 种修复剂对重金属复合污染土壤的化学固定修复效果.结果表明:糠醛渣、磷矿粉、风化煤3 种修复剂都可一定程度地降低复合污染土壤中的Cu、Zn、Pb、Cd含量,其中以风化煤降低土壤有效态Zn、Cu的效果较好,在风化煤添加量为80 g/kg时土壤有效态Zn的含量降低了37.22%,土壤有效态Cu的含量降低了31.22%;磷矿粉处理修复Pb的效果比糠醛渣、风化煤好,在磷矿粉添加量为80 g/kg时,土壤有效态Pb的含量降低了23.79%;3 种修复剂都能显著降低土壤有效态Cd,在磷矿粉添加量为40 g/kg时,土壤有效态Cd的含量降低最显著,较对照降低了83.09%.在本试验条件下,3 种修复剂对4 种重金属复合污染土壤的修复效果,以Cd 较好,其次是Zn,对Pb的修复效果较差.

Remediation of Soils Contaminated by Heavy Metals with Different Amelioration Materials

The heavy metal polluted soils were remediated with phosphate rock, furfural dreg and weathered coal respectively. The results showed that these materials decreased the available contents of heavy metals in soils. Weathered coal remediated Zn and Cu better than the other materials. Available Zn and Cu concentrations in soils with 80 g/kg weathered coal decreased by 37.22% and 31.22% respectively. Phosphate rock remediated Pb best, available Pb concentration in soils with 80 g/kg phosphate rock decreased by 23.79%. The remediation effect of Cd was the most significant, available Cd concentration decreased by 83.09% with 40 g/kg phosphate rock. Under the experimental condition, the best remediation effect of the four kinds of heavy metals was Cd, followed by Zn and Pb.