Lead Extraction from Contaminated Soil Using Water-Soluble Polymers
Publication: Journal of Environmental Engineering
Volume 130, Issue 5
Abstract
The applicability of water-soluble polymers as extractants for the remediation of heavy metal-contaminated soils has been explored using a lead-contaminated Superfund soil as a sample system. Polyethylenimine (PEI) was functionalized with bromo- or chloroacetic acid to give an aminocarboxylate chelating group, which effectively binds lead. The resulting polymer, PEIC, has extraction properties similar to the molecular chelator ethylenediaminetetraacetic acid. A series of studies was done to probe optimum conditions for lead extraction from soils obtained from the Cal-West Superfund site in New Mexico that contained approximately 10,000 ppm of Pb. In batch extraction experiments using polymer functionalized at two different levels, the polymers removed greater than 97% of the lead from the soils. Subsequent experiments demonstrated that the selective extraction of lead could be controlled by varying polymer functionalization levels. Concentration and regeneration of the polymers using ultrafiltration was also demonstrated. Release of lead from the polymer was accomplished by acidification to pH 1 with HCl. Subsequent ultrafiltration allowed recovery of the extractant polymer for reuse.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 130 • Issue 5 • May 2004
Pages: 585 - 588
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Mar 6, 2001
Accepted: Feb 12, 2003
Published online: Apr 15, 2004
Published in print: May 2004
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