Pedosphere 20(6): 771--779, 2010
ISSN 1002-0160/CN 32-1315/P
©2010 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of a biosurfactant and a synthetic surfactant on phenanthrene degradation by a Sphingomonas strain |
PEI Xiao-Hong1, ZHAN Xin-Hua1, WANG Shi-Mei1, LIN Yu-Suo2, ZHOU Li-Xiang1 |
1 College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China);
2 Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of China, Nanjing 210042 (China) |
| ABSTRACT |
| A novel phenanthrene (PHE) -degrading strain named as Sphingomonas sp.GF2B was isolated and identified from a farmland soil.Effects of a synthetic surfactant (Tween-80) and a rhamnolipid biosurfactant on PHE degradation by Sphingomonas sp.GF2B were investigated at different concentrations of the surfactants.The results showed that Sphingomonas sp.GF2B was able to mineralize up to 83.6% of PHE within 10 days without addition of surfactants.The addition of Tween-80 to the reaction medium inhibited greatly PHE biodegradation,with only 33.5% of PHE degraded.However,the biosurfactant facilitated PHE biodegradation,with up to 99.5% of PHE degraded.The preferential utilization of PHE as a carbon source and the enhanced solubility of PHE by the biosurfactant were likely responsible for the higher biodegra-dation efficiency of PHE in the presence of the biosurfactant.Therefore,it could be concluded that the application of the biosurfactant to PHE-contaminated soils was perhaps a feasible way to facilitate the PHE biodegradation. |
| Key Words: biodegradation, contaminated soils, rhamnolipid, solubility, Tween-80 |
| Citation: Pei, X. H., Zhan, X. H., Wang, S. M., Lin, Y. S. and Zhou, L. X. 2010. Effects of a biosurfactant and a synthetic surfactant on phenanthrene degradation by a Sphingomonas strain. Pedosphere. 20(6): 771-779. |
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