Title :
Effect of Rhamnolipid Biosurfactant on Solubilization and Biodegradation of Polycyclic Aromatic Hydrocarbons
Author :
Shengfeng Zhu ; Shengkang Liang ; Xueyi You
Author_Institution :
Sch. of Environ. Sci. & Technol., Tianjin Univ., Tianjin, China
Abstract :
The effectiveness of rhamnolipid biosurfactant on solubilization of polycyclic aromatic hydrocarbons (PAHs) in artifical seawater and biodegradation of phenanthrene by a marine bacterium Sphingobacterium sp. strain QPH-3 were investigated. Rhamnolipid above the CMC significantly enhanced the aqueous solubility of PAHs. The values of molar solubilization ratio are 4.9×10-1, 9.4×10-2, and 1.4×10-2 for naphthalene, phenanthrene, and pyrene, respectively. The results of biodegradation experiments showed that the extents of phenanthrene biodegradation were significantly enhanced by rhamnolipid at the optimal concentrations. When the biodegradation systems amended with rhamnolipid dosages above 10mmol/L, the surfactant compete with PAH as substrates and therefore decrease the biodegradation rate of the phenanthrene.
Keywords :
marine pollution; seawater; water pollution control; PAH aqueous solubility; PAH biodegradation; artifical seawater; marine bacterium Sphingobacterium sp strain; molar solubilization ratio values; naphthaIene; phenanthrene; phenanthrene biodegradation; phenanthrene biodegradation rate; polycyclic aromatic hydrocarbons; pyrene; rhamnolipid biosurfactant effect; rhamnolipid dosages; Biodegradation; Compounds; Degradation; Hydrocarbons; Microorganisms; Strain; Substrates; Polycyclic aromatic hydrocarbons; biodegradation; biosurfactant; solubilization;
Conference_Titel :
Intelligent System Design and Engineering Applications (ISDEA), 2013 Third International Conference on
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4673-4893-5
DOI :
10.1109/ISDEA.2012.156
