Elemental metals as electron sources for biological methane formation from CO2

Antonie van Leeuwenhoek
N Belay, L Daniels

Abstract

Several elemental metals were examined as potential electron donors for methanogenic bacteria, using both a single tube system where the metal was in direct contact with the cells, and a two-flask system, where metal and cells were not in direct contact, but had contact via the gas phase. With all organisms examined in the direct contact system, Fe degree, Al degree and Zn degree served as electron donors for methanogenesis; some organisms used Ni degree or Sn degree as low-level electron donors. Of the metals tested, methanogenesis from H2 + CO2 was inhibited by direct contact with Zn degree or Cu degree, but not by Fe degree or Al degree. Ni degree and Co degree were inhibitory to some methanogens, with Ni degree being particularly inhibitory to the thermophilic strains tested. With all organisms examined in the two-flask system, Fe degree and Zn degree served as good electron sources for both methanogenesis and growth; Co degree generated a very low level of methane and Cu degree did not work at all. In either system V degree, Ti degree or Cd degree did not serve as electron donors. The results suggest that some elemental metals (notably Fe degree, Al degree and Zn degree) produce gaseous H2 by cathodic depolarization which ...Continue Reading

References

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Nov 7, 2001·Journal of Toxicology and Environmental Health. Part B, Critical Reviews·P G GeorgopoulosP J Lioy
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Jun 1, 2021·Frontiers in Microbiology·Paola Andrea PalaciosAmelia-Elena Rotaru
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Sep 27, 2020·Environment International·Kyle M MeyerBrendan J M Bohannan
Oct 11, 2017·Environmental Science & Technology·Christy M Dykstra, Spyros G Pavlostathis

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