Giannis Apostolos, Gidarakos Evangelos
Technical University of Crete, Department of Environmental Engineering, Laboratory of Waste Management, Politechnioupolis, 73100 Chania, Greece.
J Hazard Mater. 2005 Aug 31;123(1-3):165-75. doi: 10.1016/j.jhazmat.2005.03.050.
The main objective of this study is to evaluate the combination of electrokinetic remediation and soil washing technology in order to remove cadmium from contaminated soil. This paper presents the results of an experimental research undertaken to evaluate different washing and purging solutions to enhance the removal of cadmium from a real contaminated soil during electrokinetic remediation. Two different experimental modules were applied in the laboratory. Soil was saturated with tap water, while acetic and hydrochloric acids, as well as ethylenediaminetetraacetic acid (EDTA) were used as purging solutions in the first module. Results show that there was a decrease of cadmium concentration near anode, but a significant increase in the middle of the cell, due to the increasing pH. Citric, nitric and acetic acids were used for soil washing and purging solutions in the second module. In this case, an 85% reduction of cadmium concentration was achieved. Therefore, results indicate that soil pH and washing solutions are the most important factors in governing the dissolution and/or desorption of Cd in a soil system under electrical fields.
本研究的主要目的是评估电动修复和土壤冲洗技术相结合的方法，以便从受污染土壤中去除镉。本文介绍了一项实验研究的结果，该研究旨在评估不同的冲洗和净化溶液，以提高在电动修复过程中从实际受污染土壤中去除镉的效果。在实验室中应用了两个不同的实验模块。土壤用自来水饱和，在第一个模块中，乙酸、盐酸以及乙二胺四乙酸（EDTA）被用作净化溶液。结果表明，由于pH值升高，阳极附近的镉浓度降低，但电池中部的镉浓度显著增加。在第二个模块中，柠檬酸、硝酸和乙酸被用作土壤冲洗和净化溶液。在这种情况下，镉浓度降低了85%。因此，结果表明，土壤pH值和冲洗溶液是在电场作用下控制土壤系统中镉的溶解和/或解吸的最重要因素。
