| 摘要: |
| 现行重金属污染土壤电动修复理论体系假设重金属解吸过程不受电场影响，但假设缺乏实验验证；实验采用实际污染场地的铬污染土壤，通过对比电动解吸与柱解吸的动力学曲线，发现电场对Cr(VI)解吸过程影响显著，现行无作用假设不成立；分析认为电场对土壤重金属解吸过程同时存在促进、抑制作用，两者强弱关系受其他因素影响；实验中，电场的抑制作用强于促进作用，使Cr(VI)解吸率下降，且二者的共同作用导致解吸过程稳定性下降。 |
| 关键词: 电场 解吸 污染土壤 电动修复 铬 |
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| Effect of Electric Field on Desorption Kinetics of Cr(VI) in Cr contaminated Soil |
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WU Xin da，LI Dong，FAN Min，YUAN Xing zhong
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| Abstract: |
| Prevalent electrokinetic remediation theory assumes that desorption of heavy metals in soils is independent of the electric field; which,however,is proven by experiments. This research explores the validation of this hypothesis by comparing electrokinetic desorption kinetics with column desorption kinetics with historically Cr contaminated soil,and results show that electric field significantly influences the desorption kinetics of Cr(VI) in soil,denying prevalent independency hypothesis. New theory thinks that electric field exerts both positive and negative effects on metal desorption kinetics simultaneously and advantage conversion between these two effects is affected by other factors. In this research,negative effect surpasses positive effect resulting in decrease of Cr(VI) desorption and interaction between these two effects also deteriorates the stability of Cr(VI) desorption kinetics. |
| Key words: electric field desorption contaminated soil electrokinetic remediation chromium |
