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| Enhancing Removal Efficiency of Diesel Contaminant from Soil by Biosurfactant Saponin |
| Received:July 01, 2014 |
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| KeyWord:diesel contaminated soil;enhancement;SDS;TX-100;desorption agent;saponin |
| Author Name | Affiliation | E-mail | | LU Fan | Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | | HU Qing-hua | Zhejiang University Press, Hangzhou 310028, China | | | LI Ting-qiang | Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | litq@zju.edu.cn |
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| Abstract: |
| Surfactant flushing is one of remediation techniques for petroleum-contaminated soils. In this work, a batch experiment was conducted to evaluate the performance of biosurfactant saponin for enhancing diesel removal from contaminated soil. The optimal flushing conditions were established based on the principles of chemical heat washing and the orthogonal experimental design. They were sodium silicate at 5 g·L-1, temperature at 70 ℃ and vibration time of 50 min. Results showed that under optimal flushing conditions, removal efficiency of diesel from the contaminated soil was greater for SDS-saponin mixed surfactants than that of SDS, TX-100 and SDS-TX-100 mixed surfactants. At mass ratio of 5:5 and total concentration of 1 g·L-1, SDS-saponin mixed surfactants had a removal rate of 88.65%, 16.6% greater than that of SDS-TX-100 mixed surfactants. The second reusing of the surfactant solution could remove up to 17.6 % of diesel from soil. At the same concentrations, residual amounts of SDS-saponin mixed surfactants in soil were lower than those of SDS-TX-100. Three washing reduced the surfactants from 2510 mg·kg-1 to 1790 mg·kg-1. Our results suggest that saponin could reduce surfactant dosage to a greater extent and maintain higher removal efficiencies of diesel fuel. |
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