Journal
ENVIRONMENTAL POLLUTION
Volume 174, Issue -, Pages 93-99Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2012.11.015
Keywords
Saponin; EDDS; Mixed contaminated soil; Polychlorinated biphenyl; Heavy metals; Desorption
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Funding
- National High Technology Research and Development (863) Program of China [2009AA063103]
- National Natural Science Funds of China [21077038]
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This study investigated the simultaneous desorption of trace metal elements and polychlorinated biphenyl (PCB) from mixed contaminated soil with a novel combination of biosurfactant saponin and biodegradable chelant S,S-ethylenediaminedisuccinic acid (EDDS). Results showed significant promotion and synergy on Pb, Cu and PCB desorption with the mixed solution of saponin and EDDS. The maximal desorption of Pb, Cu and PCB were achieved 99.8%, 85.7% and 45.7%, respectively, by addition of 10 mM EDDS and 3000 mg L-1 saponin. The marked interaction between EDDS and saponin contributed to the synergy performance. The sorption of EDDS and saponin on soil was inhibited by each other. EDDS could enhance the complexation of metals with the saponin micelles and the solubilization capabilities of saponin micelles for PCB. Our study suggests the combination of saponin and EDDS would be a promising alternative for remediation of co-contaminated soils caused by hydrophobic organic compounds (HOCs) and metals. (C) 2012 Elsevier Ltd. All rights reserved.
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