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• W2524750164 abstract "Evidence for the microbial metabolism of hydrocarbons is routinely identified in diverse habitats, but particularly those associated with the production, processing, storage and use of petroleum. In these environments, microbial activity can have enormous environmental and financial consequences including oil reservoir souring, biocorrosion of the steel infrastructure, and the accidental release of hydrocarbons to undesired locations. My studies were designed to specifically examine the ecological role of microorganisms in a major oil processing facility experiencing aggressive corrosion, in seawater compensated fuel ballast tanks aboard naval surface warfare vessels and to contribute to fundamental knowledge on how anaerobic microbes are able to metabolize large molecular weight paraffin molecules. An interdisciplinary approach that combined geochemical analyses, molecular microbial ecology methods, and mass spectral-based metabolomics was employed in each of these investigations. Molecular surveys of the oil processing facility revealed a systemic colonization of both dead-leg and bulk fluids by anaerobic taxa primarily affiliated with Halanaerobiales. A desalter bulk fluid was a notable exception with members of the Epsilonproteobacteria, putative microaerophiles, representing the predominant community members. Geochemical and mass spectral analyses showed steep gradients in salinity, pH, acetate and sulfate concentrations, as well as distinct low molecular weight organic constituent profiles within stratified dead-leg fluids. These gradients contrasted with the highly similar chemical properties observed in the bulk fluids that are often recirculated between the three processing modules. The presence of alkylated monoaromatic-dihydrodiols and Epsilonproetobacteria in the desalter bulk fluid, and the lack of signature anaerobic hydrocarbon biodegradation metabolites confirms that oxygen must be introduced to the resident microflora, most likely at or near the desalter unit. The findings further suggest that anaerobic microbial communities exacerbate localized corrosion by linking the metabolism of partially oxidized aerobic crude oil intermediates from the desalter module to the reduction of oxidized sulfur species. Only by examining both the dead-legs and the bulk fluids was it possible to identify the distinct microbial assemblages across small spatial distances within each module and understand their interactions that ultimately form the basis of the proposed mechanism for microbially-influenced corrosion within this facility. The selection of hydrocarbonoclastic marine microorganisms under defined ecological conditions was also pertinent to the investigation of seawater-compensated fuel ballast tanks relative to the harbor water used to augment the tanks. The examination of ships containing ballast water of different ages, revealed a pattern of succession that ranged from predominantly aerobic to largely anaerobic microbial taxa with a concomitant decrease in available dissolved oxygen and sulfate…" @default.
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• W2524750164 date "2016-09-01" @default.
• W2524750164 modified "2023-09-23" @default.
• W2524750164 title "Ecological Investigations of Hydrocarbonoclastic Microbial Communities Associated with the Built-Environment" @default.
• W2524750164 hasPublicationYear "2016" @default.
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