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Rhamnolipid biosurfactant-enhanced soil flushing for the removal of arsenic and heavy metals from mine tailings

Paper ID Volume ID Publish Year Pages File Format Full-Text
35277 45084 2009 6 PDF Available
Title
Rhamnolipid biosurfactant-enhanced soil flushing for the removal of arsenic and heavy metals from mine tailings
Abstract

Mine tailings containing high contents of arsenic and heavy metals are potential environmental contamination sources. Column experiments were conducted in this study to evaluate the feasibility of using a rhamnolipid biosurfactant (JBR425) to enhance the removal of arsenic and heavy metals from an oxidized mine tailings sample collected from Bathurst, Canada. Capillary electrophoresis (CE) analyses indicated that arsenate [As(V)] was the only extractable arsenic species in the mine tailings. The addition of rhamnolipids did not change the oxidation state of arsenic. It was found that a 0.1% rhamnolipid solution (initial pH adjusted to 11) could significantly enhance the removal of arsenic and heavy metals (i.e., Cu, Pb and Zn) simultaneously. The accumulative removal of arsenic, Cu, Pb and Zn reached 148, 74, 2379, and 259 mg/kg after a 70-pore-volume flushing, respectively. Moreover, the mobilization of arsenic and heavy metals by rhamnolipids was found to be positively correlated with that of Fe, and the mobilization of arsenic was also positively correlated to that of the heavy metals. The mobilization of co-existing metals, to some extent, might enhance arsenic mobilization in the presence of rhamnolipids by helping incorporate it into aqueous organic complexes or micelles through metal-bridging mechanisms.

Keywords
Arsenic; Biosurfactant rhamnolipids; Heavy metals; Mine tailings; Site remediation
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Rhamnolipid biosurfactant-enhanced soil flushing for the removal of arsenic and heavy metals from mine tailings
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 44, Issue 3, March 2009, Pages 296–301
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us