铜污染土壤电动修复研究
Experimental study on electrokinetic remediation of copper contaminated soil
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摘要: 应用实验方法研究了土壤重金属污染的电动力学修复方法，分析了土壤重金属污染物的迁移和变化特征。实验结果表明，在电场作用下土壤中重金属的浓度分布发生明显变化，使得大部分重金属能在电极附近富集而被去除。当实验的电场强度为0.5 V/cm时，在阳极附近土壤中铜的去除效率达到71.1%。阳极附近的pH值由开始时的6.8逐渐变小到4.4，而阴极附近则相反，由开始时的6.6逐渐增大到9.1，此外电动修复过程中电极附近的温度会发生相应的变化。Abstract: The electro-remediation method of soil contaminated by heavy metals was researched by means of experiments in this paper, and the characteristic and mechanism for distribution and migration of heavy metals were analyzed. The experimental results indicated that the concentrations of heavy metals changed obviously in soil in electric field and most of the heavy metal pollutants can be enriched and removed in the vicinity of electrodes. The removal efficiency of copper in the soil of vicinity of positive electrode was 71.1% when the experimental intensity of electricfield was 0.5 V/cm. The pH value closing to the positive electrode changed from 6.8 in initial stage to 4.4 at later stage, and the pH value was on the contrary closing to the negative electrode, namely, changed from 6.6 in the beginning to 9.1 in the last. In addition, the temperature nearby electrodes changed during the process of the electro-remediation.
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Key words:
- soil pollution /
- heavy metal /
- electrokinetic remediation /
- factors of influence
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