Optimization and partial characterization of biosurfactants produced by bacillus species and their potential for ex-situ enhanced oil recovery

H. Al-Sulaimani, Y. Al-Wahaibi, S. Al-Bahry, A. Elshafle, A. Al-Bemani, S. Joshi, S. Zargari

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

This study aims to test the potential of microbial enhanced oil recovery (MEOR) as an effective alternative in Omani oil fields. In this study, biosurfactants produced by Bacillus licheniformis and Bacillus subtilis strains isolated from oil-contaminated soils from different parts of the Sultanate of Oman were investigated. Eight different minimal production media using different sugars as carbon sources were tested on three of the strains to select the medium that maximized the production of biosurfactants which were indicated by the interfacial tension (IFT) reduction. All isolates were tested on their potential media to screen for the best biosurfactant producer among the available strains. It was found that Bacillus subtilis Strain W19 gave the maximum IFT reduction (46.6 mN/m to 3.28 mN/m) in 16 hours of incubation when grown in a minimal medium containing glucose. The yield of the biosurfactant produced by B. subtilis W19 was 2.5g/L. Critical micelle concentration (CMC) was measured to be 0.4 g/L. The biosurfactant was partially characterized by FT-IR analysis, in which the peaks obtained imply the presence of aliphatic hydrocarbons as well as a peptide-like moiety in the biosurfactant. The cell-free biosurfactant broth produced from Strain W19 was found to be stable over a pH range from 6 to 10 and was most effective at 7. It also showed no loss in surface activity when subjected to various temperatures (60, 80, and 120°C). The biosurfactant also retained almost 60% of its activity even in a high-saline environment up to 20% NaCl (w/v). Further studies were conducted to test the interaction of biosurfactant produced by B. subtilis W19 with porous media in coreflooding experiments as a tertiary-recovery stage. The results showed high potential of using this bacterium during ex-situ MEOR applications in which a total of 23% of residual oil was produced after biosurfactant and concentrated-biosurfactant injection.

Original languageEnglish
Pages (from-to)672-682
Number of pages11
JournalSPE Journal
Volume16
Issue number3
Publication statusPublished - Sep 2011

Fingerprint

enhanced oil recovery
Bacilli
Recovery
aliphatic hydrocarbon
oil
peptide
oil field
Surface tension
porous medium
sugar
glucose
incubation
Enhanced recovery
bacterium
Critical micelle concentration
carbon
Oil fields
Sugars
Peptides
Glucose

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

Optimization and partial characterization of biosurfactants produced by bacillus species and their potential for ex-situ enhanced oil recovery. / Al-Sulaimani, H.; Al-Wahaibi, Y.; Al-Bahry, S.; Elshafle, A.; Al-Bemani, A.; Joshi, S.; Zargari, S.

In: SPE Journal, Vol. 16, No. 3, 09.2011, p. 672-682.

Research output: Contribution to journalArticle

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