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

fYear

2013

fDate

16-18 Jan. 2013

Firstpage

651

Lastpage

654

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISDEA.2012.156

Filename

6456761