无机有机复合材料对重金属污染土壤的修复效应

Inorganic-organic Amendments for Immobilization of Heavy Metal Contaminants in Soil

选用多硫化钙、生物炭与有机肥组成无机有机复合材料对铅(Pb)、镉(Cd)、锌(Zn)污染土壤进行快速钝化实验研究。对修复后Pb,Cd,Zn生物有效态含量、土壤pH值以及钝化处理前后土壤中重金属各赋存形态的变化进行分析。结果显示,不同钝化处理后,有效态Pb,Cd,Zn的质量比降幅分别为9.7%～87.6%,21.0%～71.8%和45.1%～98.8%。无机材料和无机有机复合材料可显著提高土壤pH值。分级提取实验显示,不同钝化处理后土壤中3种重金属的可交换态均不同程度转化为稳定性更好的其他形态,且复合材料的钝化效果要优于单一材料。因此,多硫化钙、生物炭与有机肥组成的复合材料是一种有效的重金属修复材料。

The Pb, Cd and Zn were immobilized by using calcium polysulfide, biochar and organic fertilizer mixed amendments. Bioavailable fraction, soil pH and chemical fraetionations of Pb, Cd and Zn were measured. Results showed that bioavailable fraction of three heavy metals decreased significantly after different immobilization, which was 9.7% - 87.6%, 21.0% - 71.8% and 45.1% - 98.8%, respectively. The pH of Pb, Cd and Zn Contaminated soil increased by addition inorganicorganic amendments. The results of Tessier sequential extraction showed that the exchangeable fraction of heavy metals were transformed into other fractions, and the immobilization effect of heavy metal by using Inorganic-organic amendments is better than single amendment. Therefore, the inorganic-organic material composed of calcium polysulfide, bioehar and organic fertilizer can be use as amendment heavy metal contaminated soil.