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Stepwise addition of chemical reagents for enhancing electrokinetic removal of cu from real site contaminated soils

Authors
  • Chang, Jih-Hsing1
  • Shi, Yan-Hsong1
  • Tung, Cheng-Hung2
  • 1 Chaoyang University of Technology, Department of Environmental Engineering and Management, 168 GiFong East Road, WuFong Hsiang, Taichung County, 41349, Taiwan , WuFong Hsiang, Taichung County (Taiwan)
  • 2 National Chung Hsing University, Department of Environmental Engineering, 250, Kuo Kuang Road, Taichung, 40277, Taiwan , Taichung (Taiwan)
Type
Published Article
Journal
Journal of Applied Electrochemistry
Publisher
Springer Netherlands
Publication Date
Jan 26, 2010
Volume
40
Issue
6
Pages
1153–1160
Identifiers
DOI: 10.1007/s10800-010-0083-0
Source
Springer Nature
Keywords
License
Yellow

Abstract

In this study, a circulation-enhanced electrokinetics (CEEK) system integrated with the stepwise addition of chemical reagents was used to remediate copper-contaminated soils collected from a real site. At first, an optimal extraction process of different chemical reagents was found to obtain the highest copper removal efficiency by conducting batch extraction experiments. The chemical reagents served as extracts including EDTA, NaOH, and sodium dithionite + sodium citrate. Then, CEEK integrated this optimal extraction, that is, the treatment of 6-day EDTA, NaOH, EDTA, sodium dithionite + sodium citrate, and EDTA in a series. According to experimental results, the NaOH and sodium dithionite + sodium citrate could effectively facilitate the copper removal during the extraction and electrokinetics (EK) processes. The optimal extraction process for this real contaminated soil (94% copper removal efficiency) was the alternative extraction of EDTA, NaOH, and sodium dithionite + sodium citrate. The copper removal efficiency of the real contaminated soil could reach around 55% after 30-day CEEK treatment. The continuous decline of soil copper concentration of this integrated EK technique could be achieved as the remediation time was extended sufficiently.

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