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Growth Kinetics Study of a Bacterial Consortium Producing Biosurfactants,Constructed with Six Strains Isolated from an Oily Sludge

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Advances in Bioscience and Biotechnology 2014年第5期5卷 418-425页

作者： Zohra Sadouk-Hachaichi Ammal Tazerouti Hocine Hacene Laboratory of Applied Organic Chemistry Faculty of ChemistryUniversity of Sciences and Technology H.Boumediène(USTHB)AlgiersAlgeria Laboratory of Microbiology Faculty of Biological SciencesUniversity of Sciences and Technology H.Boumediène(USTHB)AlgiersAlgeria

We investigated the ability of a bacterial community constructed with six strains isolated from an oily sludge, to utilize diesel oil at high concentrations. The consortium was able to grow at concentrations up to 84 g diesel oil/L and had produced biosurfactants during its active growth phase;these compounds, in their crude form, reduced the surface tension of distilled water from 72 mN/m to 31 mN/m, with a corresponding Critical Micelle Concentration value γCMC = 81 mg/L. The plot of specific growth rates obtained from the growth curves versus initial concentrations was found to fit adequately the experimental data by the andrews inhibitory model, which resulted in the following kinetic constants: μmax = 0.535d-1 ± 0.063, KS = 18.68 g/L ± 3.59 and KI = 29.02 g/L ± 4.96, reflecting the slow biodegradation rate. At 25.2 g diesel oil/L, close to the optimal concentration S* = 23.28 g/L ± 4.23, the consortium metabolized diesel oil faster than each strain did individually, suggesting that the process was stimulated by a synergistic interaction between the members of the consortium.

关键词： andrews model Bacterial Consortium Biodegradation Biosurfactants Diesel Oil Kinetic Parameters

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