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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 7    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 7,July 2012
Biosurfactant Production by Microorganism for Enhanced Oil Recovery
Full Text(PDF, )  PP.115-120  
Author(s)
Elyas Golabi, Seyed Ruhollah Mortazavi Poor Sogh, Seyed Noroldin Hosseini, Mohammad Amin Gholamzadeh
KEYWORDS
: Biosurfactant, Critical Micelle Concentration, Extraction, Microbial Enhanced Oil Recovery
ABSTRACT
Biosurfactants are a group of surface active agents which are produced by microorganisms. In this research a bacterial species with the ability of producing biosurfactant was isolated from soil. The bacterium was able to grow on gas oil as the sole source of carbon and energy. Concentrations of gas oil up to about two percent were not detrimental to the bacterial activity. The excess gas oil in the fermentation medium served as an exteractant for the biosurfactant. Separation of the organic phase from the aqueous phase and evaporation of the gas oil resulted in a powder of crude biosurfactant. Each liter of the fermentation medium gave about 2.8 grams crude biosurfactant. The critical micelle concentration of the powder was I00 mg/L. The biosurfactant reduced the surface tension of distilled water to 26mN/m. An aqueous solution of the biosurfactant was used to enhance oil recovery in a high permeable and a low permeable laboratory core. The solution enhanced the oil recovery up to 15% in the high permeable core at ambient temperature. This figure was 7.5% in the low permeable core. The biosurfactant retained its activity in enhanced oil recovery when the temperature of the core increased to 80 oC
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