Kim Soon-Oh, Kim Won-Seok, Kim Kyoung-Woong
Department of Earth and Environmental Sciences, Gyeongsang National University, 660-701 Jinju, Republic of Korea.
Environ Geochem Health. 2005 Sep;27(5-6):443-53. doi: 10.1007/s10653-005-2673-z.
The potential of electrokinetic (EK) remediation technology has been successfully demonstrated for the remediation of heavy metal-contaminated fine-grained soils through laboratory scale and field application studies. Arsenic contamination in soil is a serious problem affecting both site use and groundwater quality. The EK technology was evaluated for the removal of arsenic from two soil samples; a kaolinite soil artificially contaminated with arsenic and an arsenic-bearing tailing-soil taken from the Myungbong (MB) gold mine area. The effectiveness of enhancing agents was investigated using three different types of cathodic electrolytes; deionized water (DIW), potassium phosphate (KH(2)PO(4)) and sodium hydroxide (NaOH). The results of the experiments on the kaolinite show that the potassium phosphate was the most effective in extracting arsenic, probably due to anion exchange of arsenic species by phosphate. On the other hand, the sodium hydroxide seemed to be the most efficient in removing arsenic from the tailing-soil. This result may be explained by the fact that the sodium hydroxide increased the soil pH and accelerated ionic migration of arsenic species through the desorption of arsenic species as well as the dissolution of arsenic-bearing minerals.
通过实验室规模研究和现场应用研究，电动修复技术在修复重金属污染细粒土壤方面的潜力已得到成功验证。土壤中的砷污染是一个严重问题，影响着场地使用和地下水质量。对电动技术从两个土壤样品中去除砷进行了评估，一个是人工被砷污染的高岭土，另一个是取自鸣凤（MB）金矿地区的含砷尾矿土。使用三种不同类型的阴极电解质研究了增强剂的有效性，分别是去离子水（DIW）、磷酸钾（KH₂PO₄）和氢氧化钠（NaOH）。对高岭土的实验结果表明，磷酸钾在提取砷方面最有效，这可能是由于磷酸根与砷物种发生了阴离子交换。另一方面，氢氧化钠似乎是从尾矿土中去除砷最有效的。这一结果或许可以通过以下事实来解释：氢氧化钠提高了土壤pH值，并通过砷物种的解吸以及含砷矿物的溶解加速了砷物种的离子迁移。
