4.7 Article

Electrochemical EDTA recycling with sacrificial Al anode for remediation of Pb contaminated soil

期刊

ENVIRONMENTAL POLLUTION
卷 158, 期 8, 页码 2710-2715

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2010.04.014

关键词

Lead; Contaminated soil; Remediation; EDTA; Electrochemical treatment

资金

  1. Slovenian Research Agency [J4-9277]

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Recycling chelant is a precondition for cost-effective EDTA-based soil remediation. Extraction with EDTA removed 67.5% of Pb from the contaminated soil and yielded washing solution with 1535 mg L-1 Pb and 33.4 mM EDTA. Electrochemical treatment of the washing solution using Al anode, current density 96 mA cm(-2) and pH 10 removed 90% of Pb from the solution (by electrodeposition on the stainless steel cathode) while the concentration of EDTA in the treated solution remained the same. The obtained data indicate that the Pb in the EDTA complex was replaced by electro-corroded Al after electro-reduction of the EDTA and subsequently removed from the solution. Additional soil extraction with the treated washing solution resulted in total removal of 87% of Pb from the contaminated soil. The recycled EDTA retained the Pb extraction potential through several steps of soil extraction and washing solution treatment, although part of the EDTA was lost by soil absorption. (C) 2010 Elsevier Ltd. All rights reserved.

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