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APPLICATION OF CULTURE SUPERNATANTS CONTAINING SURFACTANTS TO ENHANCE OIL RECOVERY
Abstract
Currently, a big problem is increasing the production of residual oil, for which so-called tertiary recovery methods are used. One common tertiary recovery method is the use of surfactants. The use of biological surfactants instead of synthetic ones can solve the problem of increasing oil production and reducing the toxic impact on the environment. To obtain biosurfactants, two strains of Bacillus mojavensis and Bacillus amyloliquefaciens were used. These strains are characterized by the ability to produce biosurfactants. Biosurfactants produced by these strains belonged to the group of lipopeptides, represented mainly by surfactin molecules. The qPCR method established that in strains B. mojavensis and B. amyloliquefaciens the number of srfAA and ituC genes responsible for the production of surfactin was 2.8x104 and 1.9x103 gene copies ml-1, and iturin for 4.6x102 gene copies ml-1 in strain B amyloliquefaciens. To evaluate the effectiveness of MEOR, culture supernatant containing biosurfactants was tested on sand cores simulating oil reservoir. The surface tension of the culture supernatants of the B. mojavensis and B. amyloliquefaciens strains was 29.79 - 0.039 and 31.18 - 0.065 mN m-1. When culture supernatants were used, additional oil recovery was 11.1 and 11.8% for B. mojavensis and B. amyloliquefaciens, respectively.
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