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Extraction,Recovery, and Biostability of EDTA for Remediation of Heavy Metal-Contaminated Soil
Authors:P K Andrew Hong  Chelsea Li  Shankha K Banerji  Tulsi Regmi
Institution:1. Department of Civil and Environmental Engineering, University of Utah, Salt Lake City, UT 84112;2. Department of Civil Engineering, University of Missouri, Columbia, MO 65211
Abstract:Chelation removal of heavy metals from contaminated soil is seen as a viable remediation technique. A useful chelating agent should be strong, reusable, and biostable during metal extraction and recovery operations. This work tested the extraction, recovery, and biostability of EDTA as a potential remediating agent. Parameters, including EDTA concentration, soil type, soil content, washing cycle, precipitant concentration and type, and pH, were varied and tested during metal extraction and recovery operations. Factors, including EDTA concentration, aqueous and 5% soil slurry, presence of Pb, acclimated and unacclimated activated sludges, along with abiotic control, were varied and studied in the biodegradation of EDTA. The results showed that EDTA was able to extract lead completely from the tested soils, amenable to recovery by addition of cationic and anionic precipitants in the alkaline pH range, relatively biostable even under conditions very favorable toward biodegradation. Thus, EDTA is a strong, recoverable, and relatively biostable chelating agent that has potential for soil remediation application.
Keywords:chelation removal  heavy metals  contaminated soil  chelating agent  
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