Accelerated methanogenesis from aliphatic and aromatic hydrocarbons under iron- and sulfate-reducing conditions

Oxidation of Polycyclic Aromatic Hydrocarbons under Sulfate-Reducing Conditions.

[(sup14)C]naphthalene and phenanthrene were oxidized to (sup14)CO(inf2) without a detectable lag under strict anaerobic conditions in sediments from San Diego Bay, San Diego, Calif., that were heavily contaminated with polycyclic aromatic hydrocarbons (PAHs) but not in less contaminated sediments. Sulfate reduction was necessary for PAH oxidation. These results suggest that the self-purificatio...

Distinguishing iron-reducing from sulfate-reducing conditions.

Ground water systems dominated by iron- or sulfate-reducing conditions may be distinguished by observing concentrations of dissolved iron (Fe(2+)) and sulfide (sum of H(2)S, HS(-), and S(=) species and denoted here as "H(2)S"). This approach is based on the observation that concentrations of Fe(2+) and H(2)S in ground water systems tend to be inversely related according to a hyperbolic function...

Inhibition of methanogenesis by ethylene and other unsaturated hydrocarbons : (Methanogenic degradation; selective inhibition; sulfate reduction; ethylene; acetylene; aromatic hydrocarbons)

Ethylene (ethene) was found to inhibit methane formation in slurries from sewage sludge and sediment samples taken from freshwater and marine sources. Methane formation from sediment contents was inhibited by 50% at 0.07% ethylene concentration in the gas phase (approx. 5 #moll -1 in the aqueous phase) and by 94% at >i 0.5% ethylene in the gas phase (>1 36 #mol. 1-1 in the aqueous phase). Sulph...

Friction O F Iron Lubricated with Aliphatic and Aromatic Hydrocarbons and Halogenated Analogs

Microbial methanogenesis in the sulfate-reducing zone

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