Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 1, Issue 3, Pages 448-452Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2013.06.010
Keywords
Soil remediation; Water treatment; Metal extraction; Metal discharge; Chelate recovery
Categories
Funding
- EC Seventh Framework Programme (FP7)Environment (including Climate Change) within the project TIMBRE [265364]
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We studied a chemical treatment in order to reuse aqueous solutions of chelating agents for trace-metals extraction from a contaminated soil. FeS, air-sparging and Ca-3(PO4)(2) were successively used to precipitate Cu, Ni and Pb from chelates in soil extracts and recover polyaminocarboxylates in their Ca-form. The results of batch experiments showed that the reused extracting solutions kept their high extraction efficiency after 3-runs. Chelant and solution losses were stable on each run and ranged from 10 to 20%. The low solubility and the stability of FeS in mild acidic conditions make it a promising reagent for metal precipitation and chelant recovery in soil-washing. (C) 2013 Elsevier Ltd All rights reserved.
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