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Diesel uptake by an indigenous microbial consortium isolated from sediments of the Southern Gulf of Mexico: Emulsion characterisation

García-Cruz, N.U., Valdivia-Rivera, S., Narciso-Ortiz, L., García-Maldonado, J.Q., Uribe-Flores, M.M., Aguirre-Macedo, M.L., Lizardi-Jiménez, M.A.
Environmental pollution 2019 v.250 pp. 849-855
Alcanivorax, Marinobacter, aromatic hydrocarbons, biomass, bioreactors, carbon, droplet size, droplets, emulsifiers, emulsions, freshwater, hexadecane, marine sediments, microbial growth, pollution, remediation, surface water, total suspended solids, Gulf of Mexico, Mexico
In this study a microbial consortium, dominated by members of the genera Marinobacter and Alcanivorax (Gammaproteobacteria) isolated from marine sediments of Southern Gulf of Mexico, was assessed to grow in a bubble column bioreactor using 13 g L−1 of diesel (aliphatic and aromatic hydrocarbons mix including nonane and hexadecane) as the sole carbon source. The consortium was able to produce 3.3 g L−1 of biomass, measured as suspended solids. Microbial growth was detectable, even substrate depletion, after 8 days of cultivation. The emulsifier activity and its influence on the droplet size were also evaluated: it was observed that droplet diameter decreases as emulsifier activity increases. The bubble column bioreactor system proposed in this research could be used as a biotechnological process for the remediation of a contaminated body in important petrochemical regions, for example, Veracruz, México, where some points of sea and fresh-water bodies were analysed to find nonane and hexadecane in all sample water. It is important due to a lack of information, regarding hydrocarbon pollution in this port area, is filled.