| 薛腊梅,刘志超,尹 颖,孙媛媛,郭红岩.微波强化EDDS淋洗修复重金属污染土壤研究[J].农业环境科学学报,2013,32(8):1552-1557. |
| 微波强化EDDS淋洗修复重金属污染土壤研究 |
| Microwave-enhanced Remediation of Cd, Pb and Zn Contaminated Soil Using EDDS as a Leaching Agent |
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| DOI：10.11654/jaes.2013.08.009 |
| 中文关键词: 重金属污染 土壤淋洗 微波强化 EDDS |
| 英文关键词: Cd Pb Zn leaching microwave-enhanced EDDS |
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| 中文摘要: |
| 为了快速去除土壤中的重金属污染，采用微波强化[S，S]-乙二胺二琥珀酸（[S，S]-EDDS，简写为EDDS）淋洗方法，做了微波时间、功率对Cd、Pb、Zn去除效率影响的实验，并用BCR连续提取法分析了微波强化EDDS淋洗对土壤中重金属形态的影响。结果表明，在微波功率900 W，时间10 min条件下，EDDS对Cd、Pb、Zn的去除率分别达到29%、89%、71%，比未引入微波时淋洗的各重金属的最高去除率分别提高8%、26%、33%，且明显缩短了处理时间（从6 h缩短为10 min）。与处理前原土壤相比，土壤在微波辐射淋洗处理后，主要污染重金属的交换态和碳酸盐结合态以及铁锰氧化物结合态明显降低（其中Cd降低34%，Pb降低90%、Zn降低83%），残渣态增加，从而有效降低了土壤中毒害污染重金属元素含量和重金属可利用性，减轻了污染土壤的生态风险。微波辅助淋洗修复可作为一种重金属污染场地的快速修复技术。 |
| 英文摘要: |
| With the rapid industrialization and urbanization in the world, soil pollution is intensifying, especially heavy metal contamination. A new approach using microwave coupled to EDDS as a leaching agent for removal of Cd, Pb, and Zn from field soils was examined in the laboratory. Effects of time and power of microwave on removal efficiency and fractionation of heavy metals were investigated. The results showed that under microwave condition（900 W, 10 min）, the removal efficiencies of Cd, Pb, and Zn were 29%, 89%, and 71%, respectively, increased by 8%, 26%, and 33%, respectively, compared with those without microwave treatment. In addition, the processing time was greatly reduced from 6 h to 10 min. Sequential extraction results showed that the exchangeable, carbonate bound and Fe-Mn oxide bound fractions of metal concentrations were obviously reduced after treatment, by 34%, 90%, and 83% for Cd, Pb, and Zn, respectively, whereas the residual fraction was increased, which reduces ecological risks of heavy metals. Microwave-assisted leaching can be a promising remediation method for heavy metal contaminated sites. |
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