Reusing chelating agents to wash metal-contaminated soils

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 Ca3(PO4)2 were successively used to precipitate Cu, Ni and Pb from chelates in soil extracts and recover polyaminocarboxylates in their...

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Bibliographic Details
Published in:Journal of environmental chemical engineering 2013-09, Vol.1 (3), p.448-452
Main Authors: Efligenir, Anthony, Mohamed, Mahmoud Ahmed, Fievet, Patrick, Fatin-Rouge, Nicolas
Format: Article
Language:English
Subjects:
Chelate recovery
Chemical Sciences
Metal discharge
Metal extraction
Soil remediation
Water treatment
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Summary: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 Ca3(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.
ISSN:2213-3437
2213-3437
2213-2929
DOI:10.1016/j.jece.2013.06.010