Laboratory Study of Successive Soil Saline Leaching and Electrochemical Lead Recovery
Publication: Journal of Environmental Engineering
Volume 131, Issue 2
Abstract
This research is related to a laboratory study on the performance of a successive soil saline leaching and electrochemical lead recovery process for soil decontamination. Erlenmeyer leaching assays showed that the addition of 5.5 mol NaCl/L in 25% (w/w) of soil pulp density maintained at pH 3.0 was found the most effective condition for Pb leaching. Under these conditions, 65% of Pb was leached from soil. Electrochemical treatment using an iron–monopolar electrode system operated at a current intensity of 3.0 A was able to reduce Pb content in soil leachate from 650 to 0.15 mg/L and this without production of metallic residue. Then, a leaching tank reactor and electrolytic cell coupled in a closed loop showed that the Pb mass balance of extrants/intrants ratio indicated 99.0 1.6% of Pb was recovered. Likewise, 94.1% of chloride ions were reused in the leaching tank reactor after electrochemical treatment.
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Acknowledgments
Sincere thanks are due to the FCAR, AUPELF-UREF, and Canada Research Chair program for their financial support. The writers are very grateful to Myriam Chartier for her technical assistance. Finally, the writers would like to thank Mustapha Lounès for reading the manuscript and providing useful suggestions.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 131 • Issue 2 • February 2005
Pages: 305 - 314
Copyright
© 2005 ASCE.
History
Received: Oct 3, 2003
Accepted: Feb 24, 2004
Published online: Feb 1, 2005
Published in print: Feb 2005
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