Abstract
Three microbial consortia were isolated from three polluted soils located at an oil refinery and acclimated to grow on diesel fuel as the sole carbon source. Batch experiments were then conducted with the three consortia to study the kinetics of diesel biodegradation. The effects of temperature (25, 30 and 35 °C) and diesel concentration (0.5, 1 and 3 %) on the biodegradation of diesel were analysed. Several species were identified in the acclimated microbial consortia, and some of them appeared in more than one consortium. Thermal inhibition was observed at 35 °C. In the rest of experiments, over 80 % of the substrate was degraded after 40 h of treatment. These results proved the good feasibility of using the polluted sites as sources of mixed consortia for hydrocarbon degradation. However, diesel degradation efficiencies and rates were very similar, suggesting that the acclimation process produced mixed consortia with very similar characteristics; in this context, origin of the soil sample was not a decisive factor. A simple Monod-type kinetic model was used to simulate the biodegradation process, and accurate results were obtained. The μ max values were between 0.17 and 0.34 h−1. The results of this study revealed that the consortia can function at high concentrations of hydrocarbons without any sign of growth inhibition, which is important for the design of bioreactors for wastewater treatment with high concentrations of fuel.
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Acknowledgments
This research was funded under project CTM2006-03314 by the Spanish Government National Plan for Research and project PBI08-0206-7303 by the Castilla-La Mancha Regional Government. The financial support (Grant number FSE 2007/2013 PRINCET E08/005) of Alquimia Soluciones Ambientales is gratefully acknowledged.
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Moliterni, E., Jiménez-Tusset, R.G., Villar Rayo, M. et al. Kinetics of biodegradation of diesel fuel by enriched microbial consortia from polluted soils. Int. J. Environ. Sci. Technol. 9, 749–758 (2012). https://doi.org/10.1007/s13762-012-0071-5
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DOI: https://doi.org/10.1007/s13762-012-0071-5