P26IMPROVED RECOVERY TECHNIQUES FOR STRONG CHELATING AGENTS FOLLOWING HEAVY METAL EXTRACTION |
C. Li(1), W. Jiang(1), A.P. Hong(1), R. Okey(1), and S.K. Banerji(2), (1)Civil and Environmental Engineering, University of Utah, Salt Lake City, UT 84112, (2)Dept. of Civil Engineering, University of Missouri-Columbia, Columbia, MO 65211 |
Chelating extraction of heavy metals from contaminated soils is seen as a viable remediation technique. Strong chelating agents are desirable because they effect more complete extraction within less cycles; however, they are more difficult to recover and reuse after the application.
Chelating agents having moderate strength in metal complexation were found to be more amenable to their subsequent recovery and reuse. In order to make full use of strong chelating agents such as EDTA or DTPA, improved recovery techniques must be available. This paper will focus on the application of strong chelating agents in soil remediation and present efforts and results in improving their recovery and reuse. Key words: heavy metal, soil remediation, chelating extraction, recovery
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