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Modelling the ex situ bioremediation of diesel-contaminated soil in a slurry bioreactor using a hydrocarbon-degrading inoculant

AuthorsMaría Balseiro-Romero, Carmen Monterroso, Petra S. Kidd, Thelmo A. Lu-Chaua, Panagiotis Gkorezise, Jaco Vangronsvelde, Juan J. Casaresf
Issue Date2019
PublisherAcademic Press
CitationJournal of Environmental Management 246: 840- 848 (2019)
AbstractBioremediation is a soil clean-up technique which exploits the metabolic capacity of microorganisms to degrade soil contaminants. A model was developed to simulate the ex situ bioremediation of a diesel-contaminated soil in a bio-slurry reactor inoculated with a diesel-degrading bacterial strain. Mass transfer processes involving desorption of diesel from soil to water and volatilization of diesel from water, and biodegradation by the bacterial inoculant were included in the model by using Weibull sigmoid kinetics and logistic/Monod kinetics respectively. Model parameters were estimated in batch-based abiotic and biodegradation experiments. Sensitivity analysis revealed the importance of maintaining a high bacterial density in the system for maximum bioremediation efficiency. The model was validated using a pilot bioreactor monitored for 528 h, which removed almost 90% of the diesel present in the system. The results revealed the capacity of the model to predict the bioremediation efficiency under different scenarios by adapting the input parameters to each system.
Publisher version (URL)http://dx.doi.org/10.1016/j.jenvman.2019.06.034
Identifiersdoi: 10.1016/j.jenvman.2019.06.034
issn: 1095-8630
Appears in Collections:(IIAG) Artículos
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