Bacterial methanogenesis and growth from CO/sub 2/ with elemental iron as the sole source of electrons
Journal Article
·
· Science (Washington, D.C.); (United States)
Previous studies of anaerobic biocorrosion have suggested that microbial sulfur and phosphorus products as well as cathodic hydrogen consumption may accelerate anaerobic metal oxidation. Methanogenic bacteria, which normally use molecular hydrogen (H/sub 2/) and carbon dioxide (CO/sub 2/) to produce methane (CH/sub 4/) and which are major inhabitants of most anaerobic ecosystems, use either pure elemental iron (Fe/sup 0/) or iron in mild steel as a source of electrons in the reduction of CO/sub 2/ to CH/sub 4/. These bacteria use Fe/sup 0/ oxidation for energy generation and growth. The mechanism of Fe/sup 0/ oxidation is cathodic depolarization, in which electrons from Fe/sup 0/ and H/sup +/ from water produce H/sub 2/, which is then released for use by the methanogens; thermodynamic calculations show that significant Fe/sup 0/ oxidation will not occur in the absence of H/sub 2/ consumption by the methanogens. The data suggest that methanogens can be significant contributors to the corrosion of iron-containing materials in anaerobic environments.
- Research Organization:
- Univ. of Iowa, Iowa City
- OSTI ID:
- 6337169
- Journal Information:
- Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 237; ISSN SCIEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
09 BIOMASS FUELS
090122 -- Hydrocarbon Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
& Degradation
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKANES
ANAEROBIC CONDITIONS
BACTERIA
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
DATA
ECONOMIC IMPACT
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
EXPERIMENTAL DATA
FERMIONS
GROWTH
HYDROCARBONS
HYDROGEN
INFORMATION
IRON
LEPTONS
METALS
METHANE
METHANOGENIC BACTERIA
MICROORGANISMS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SYNTHESIS
TRANSITION ELEMENTS
090122 -- Hydrocarbon Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
& Degradation
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKANES
ANAEROBIC CONDITIONS
BACTERIA
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
DATA
ECONOMIC IMPACT
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
EXPERIMENTAL DATA
FERMIONS
GROWTH
HYDROCARBONS
HYDROGEN
INFORMATION
IRON
LEPTONS
METALS
METHANE
METHANOGENIC BACTERIA
MICROORGANISMS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SYNTHESIS
TRANSITION ELEMENTS