The use of microorganisms is an evolving method for the degradation of hydrocarbon contaminants. In this aim, halophilic hydrocarbon degrading bacteria were isolated from oil contaminated soil in Tunisia. A lipopeptide biosurfactant produced by Bacillus subtilis SPB1 was tested to increase diesel biodegradation along with co-inoculation with two BioS producing strains. Results revealed the enhancement of diesel biodegradation by the selected halophilic consortia when co-inoculating with B. subtilis SPB1 and the halophilic newly isolated strain (H1). The addition of the SPB1 lipopeptide seems not to have a pronounced effect on the biodegradation efficiency. However, the addition of an anionic surfactant SDS improves diesel digestion by 9.18%. Biostimulation with an organic nitrogen source improves greatly diesel biodegradation (25.24%). Results suggested the potential applicability of the selected consortia along with the in situ added BioS and biostimulation for the bioremediation of diesel contaminated water in marine environment.
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