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

Author:
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.
Source:
Environmental pollution 2019 v.250 pp. 849-855
ISSN:
0269-7491
Subject:
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
Abstract:
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.
Agid:
6393621