Chemical-Enhanced Washing for Remediation of Soils Contaminated with Marine Diesel Fuel in the Presence/Absence of Pb
Publication: Journal of Environmental Engineering
Volume 133, Issue 5
Abstract
The effects of the operating conditions, the initial concentrations of marine diesel fuel (MDF) and the coexisting Pb in the soil, and the ethylene diamine tetra acetic salt (EDTA) in solution on MDF removal by sodium dodecyl sulfate (SDS) washing were extensively investigated with the aim of optimizing the process parameters and determining the MDF removal efficiency by SDS under different contamination conditions. The experimental results from batch tests indicated that the majority of MDF was removed by SDS in the first , and its optimal pH was nearly neutral. Increasing the SDS concentration linearly increased the MDF removal efficiency. At a given SDS concentration, the removal efficiency was dependent on the existing forms of MDF in soils, and the free phase of MDF was found to be more easily removed than the adsorbed phase. MDF removal by SDS was significantly reduced by the coexisting Pb in soils, which likely forms a complexation with SDS and thereby enhances the partitioning of MDF in the soil by the re-adsorption of released MDF onto the hydrophobic tails of the adsorbed SDS. EDTA alone, or with SDS, could remove MDF, but the remaining MDF in the contaminated soil after EDTA washing became more difficult to be removed by SDS. Therefore, the EDTA washing followed by SDS washing is not recommended for MDF removal.
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Acknowledgments
The writers wish to thank 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 133 • Issue 5 • May 2007
Pages: 548 - 555
Copyright
© 2007 ASCE.
History
Received: Mar 27, 2006
Accepted: Dec 5, 2006
Published online: May 1, 2007
Published in print: May 2007
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