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Effect of an emulsifying surfactant on diesel degradation by cultures exhibiting inducible cell surface hydrophobicity

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Title Effect of an emulsifying surfactant on diesel degradation by cultures exhibiting inducible cell surface hydrophobicity
 
Creator MOHANTY, G
MUKHERJI, S
 
Subject mixed-bacterial culture
crude-oil
micellar solubilization
nonionic surfactants
biodegradation
bioavailability
hydrocarbons
strain
phase
soil
triton x-100
napl biodegradation
maximum decay rate
pristane
 
Description Background: Accumulation of petroleum hydrocarbons in the environment is often attributed to inherently slow degradation rates. This study was conducted to determine if diesel biodegradation by cultures exhibiting inducible cell surface hydrophobicity could be enhanced by addition of a chemical surfactant promoting emulsification. Experiments were designed to determine quantitatively the enhancement in diesel degradation caused by Triton X-100 for two bacterial cultures, Exiguobacterium aurantiacum and Burkholderia cepacia. Results: In the presence of Triton X-100 at twice the critical micelle concentration (CMC) the extent of degradation in whole diesel in 5 days was 1.6-1.8 times that observed over 15 days with no surfactant. The enhancement in overall degradation of diesel range resolved peaks (DRRP, representing n-alkanes and branched alkanes) was 1.76 and 1.26 times for E. aurantiacum and B. cepacia cultures respectively. Although an enhancement in decay rate was observed for all n-alkane components, it was most significant for C19, C25 and pristane. Conclusion: For cultures exhibiting direct interfacial uptake, the beneficial effect of an emulsifying surfactant found here is in contrast to earlier studies reporting a detrimental effect due to detachment of cells from the oil/water interface. Surfactant addition may have significant potential in enhancing degradation of the more recalcitrant components. (C) 2007 Society of Chemical Industry
 
Publisher JOHN WILEY & SONS LTD
 
Date 2011-08-16T20:18:02Z
2011-12-26T12:55:07Z
2011-12-27T05:43:44Z
2011-08-16T20:18:02Z
2011-12-26T12:55:07Z
2011-12-27T05:43:44Z
2007
 
Type Article
 
Identifier JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, 82(11), 1004-1011
0268-2575
http://dx.doi.org/10.1002/jctb.1753
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9612
http://hdl.handle.net/10054/9612
 
Language en