Anaerobic benzene oxidation in the Fe(II) reduction zone of petroleum-contaminated aquifers

Article Abstract:

Possible anaerobic benzene oxidation in the Fe(III) reduction zone of petroleum-contaminated aquifers was studied with sediments incubated under strict anaerobic conditions without any changes. Results showed that benzene did not oxidize into 14CO2 at most sites studied. The result affirmed results of other studies which showed that benzene tends to stay in unchanged, anaerobic aquifer materials and that long periods of time are needed to adapt the microbial population for benzene degradation. However, a site in Bemidji, MN, showed that benzene was oxidized to 14CO2 in unchanged sediments without apparent delay, suggesting that benzene was anaerobically degraded in situ.

All Other Basic Inorganic Chemical Manufacturing, Petrochemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Benzene, Iron Compounds NEC, Analysis, Water pollution, Iron compounds, Aquifers

---

Consumption of freons CFC-11 and CFC-12 by anaerobic sediments and soils

Article Abstract:

The depletion of the ozone in the stratosphere can be attributed to the freons CFC-11 and CFC-12. These freons were previously thought to be virtually unreactive biologically, but research indicates that they may be unstable under certain conditions. Several anaerobic soils and sediments were consumed by CFC-11 and CFC-12. The results illustrated that these freons are not biochemically inert in anaerobic environments. These findings indicate that the anaerobic degradation of these freons in anaerobic landfills could stop some of the freons from entering the atmosphere.

Anaerobic bacteria, Chlorofluorocarbons

---

Anaerobic hydrocarbon degradation in petroleum-contaminated harbor sediments under sulfate-reducing and artificially imposed iron-reducing conditions

Article Abstract:

The effect of iron(III) (Fe(III)) oxides on the anaerobic degradation of petroleum-related hydrocarbons in marine sediments was investigated in sediments collected from San Diego Bay, CA. The addition of Fe(III) did not switch the terminal-electron accepting process from sulfate reduction to Fe(III) reduction. Fe(III) reduction also did not stimulate anaerobic hydrocarbon degradation. The Fe(III)-reducing bacteria stimulated contaminant degradation only after exposure of the sediments to air but degradation was inhibited under certain conditions.

Usage, Biodegradation, Marine sediments, Ferric oxide, Hydrocarbons

Similar abstracts:

• Abstracts: Organization of zeolite microcrystals for production of functional materials. Selenium/zeolite Y nanocomposites
• Abstracts: Lead immobilization of from aqueous solutions and contaminated soils using phosphate rocks. Chemical and mineralogical characterizations of Pb in a contaminated soil: reactions with synthetic apatite
• Abstracts: In situ spectroscopic investigations of adsorption mechanisms of nitroaromatic compounds at clay minerals. Specific adsorption of nitroaromatic explosives and pesticides to clay minerals
• Abstracts: Cluster mission to rise from the ashes. Europe ponders space constraints. Ariane failure casts shadow over ESA's science program
• Abstracts: Unidirectional freezing of waste-activated sludges: effects of freezing speed. Comment on 'Unidirectional Freezing of Waste-Activated Sludge: the Presence of Sodium Chloride'

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.