期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 180, 期 1-3, 页码 152-157出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2010.04.007
关键词
Contaminated soil; Cu; Soil remediation; EDTA; Electrochemical treatment
资金
- Slovenian Research Agency [J4-9277]
Recycling chelant is a precondition for cost-effective EDTA-based soil washing remediation technologies. Soil contaminated with 290 mg kg(-1) Cu was extracted with 40 mmol EDTA per kg of soil. The spent washing solution (containing 73 +/- 1 mg L-1 of Cu and 8.4 +/- 0.0 g L-1 of EDTA) was treated in a single-compartment electrolytic cell using a sacrificial Al anode, at current density 96 mA cm(-2) and pH 6, 10 and pH left unregulated. Electrochemical treatment at pH 10 efficiently separated metal from chelant; 99% of Cu was removed from the solution, mostly by electro-deposition on the stainless steel cathode, while almost all the EDTA was preserved in the solution. The Cu in the EDTA complex was presumably replaced by Al electro-corroded from the anode after electro-reduction of the EDTA at the cathode. After trans-complexation, the EDTA in the treated washing solution retained from 82 to 69% of the Cu extraction potential. Reusing the washing solution in several soil extraction and EDTA recycling steps reduced the Cu soil concentration to 70 mg kg(-1). while a single use of EDTA solution removed less than half of the Cu from the soil. (C) 2010 Elsevier B.V. All rights reserved.
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