Study on Optimal Conditions for Recovery of EDTA from Soil Washing Effluents
Publication: Journal of Environmental Engineering
Volume 131, Issue 11
Abstract
The recovery of ethylenediaminetetraacetic acid (EDTA) from washing effluents is essential to reduce the cost of EDTA-enhanced soil washing and the production of wastewater. This study evaluated a recovery method, in which Pb or Zn was first dissociated from Pb– or Zn–EDTA complex through the replacement reaction by adding and then removed as phosphate precipitates through adding . Finally, Fe(III) was removed as precipitates through adding . As a result, EDTA was recovered as Ca–EDTA for further use in soil washing process. The optimal conditions for EDTA recovery, including the molar ratios of and to EDTA as well as the pH after adding and adding , were well investigated. Under the optimal conditions, 96% of Pb or 83% of Zn was removed from the Pb– or Zn–EDTA, respectively. The four-cycle recovery and reuse of EDTA experiments indicated the recovered EDTA from soil washing effluents did not lose much chelating capacity for Pb removal. However, there is a loss of 15% of its chelating capacity in the first cycle reuse for Zn-contaminated soil washing due to substantial Zn residual in the recovered EDTA solution.
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Acknowledgment
The writers wish to thank the Research Grants Council for granting a RGC Competitive Earmarked Research Grant (Project No. HKUST 6103/04E) to support this research study.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 131 • Issue 11 • November 2005
Pages: 1507 - 1513
Copyright
© 2005 ASCE.
History
Received: Jul 20, 2004
Accepted: Feb 28, 2005
Published online: Nov 1, 2005
Published in print: Nov 2005
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