![]() ![]() In literature, no study was encountered showing biodegradation efficiencies of Bacillus axarquiensis which was isolated from the drilling fluid in our study. Klebsiella pneumoniae was found to degrade 60% of the petroleum in the media and Bacillus axarquiensis degraded 51%. spizizenii, Bacillus cereus, Enterococcus faecalis were isolated from the waste mud pit and Proteus mirabilis, Klebsiella pneumoniae, Bacillus tequilensis, Bacillus axarquiensis and Enterobacter cloacae were isolated from the drilling fluid. Resultsīacillus cereus, Proteus mirabilis, Bacillus subtilis, Enterococcus faecalis were isolated from the crude oil sample Bacillus subtilis subsp. ![]() Petroleum biodegradations by bacteria were measured by using colorimetric, spectrophotometric and gravimetric methods. ![]() Upon identification of the isolated bacteria, the incubations in petroleum containing media were performed at 150 rpm at 30☌ for 7 days. The contents of crude oil, drilling fluid and waste mud pit samples were enriched in appropriate conditions. In this study, the aim was to isolate and identify bacterial strains in crude oil, drilling fluid and waste mud pit samples collected from the same oil field, determine the petroleum biodegradation and find the most effective bacteria in the samples in petroleum biodegradation.
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