Molecular hydrogen: An abundant energy source for bacterial activity in nuclear waste repositories
| Autor: | Marie Libert, Olivier Bildstein, Michel Jullien, R. Sellier, Loïc Esnault |
|---|---|
| Přispěvatelé: | Laboratoire de Modélisation des Transferts dans l'Environnement (LMTE), Service Mesures et modélisation des Transferts et des Accidents graves (SMTA), Département Technologie Nucléaire (DTN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Département Technologie Nucléaire (DTN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
| Rok vydání: | 2011 |
| Předmět: |
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
Hydrogen Microorganism chemistry.chemical_element [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] 010501 environmental sciences 7. Clean energy 01 natural sciences Redox 03 medical and health sciences Geochemistry and Petrology Autotroph Hydrogen bacteria 030304 developmental biology 0105 earth and related environmental sciences 0303 health sciences Waste management Biocorrosion Radioactive waste Biosphere Deep geological environments Nuclear waste disposal Geophysics chemistry 13. Climate action Autotrophy Energy source Hydrogen metabolism Waste disposal |
| Zdroj: | Physics and Chemistry of the Earth, Parts A/B/C Physics and Chemistry of the Earth, Parts A/B/C, Elsevier, 2011, 36 (17-18), pp.1616-1623. ⟨10.1016/j.pce.2011.10.010⟩ Physics and Chemistry of the Earth, Parts A/B/C, 2011, 36 (17-18), pp.1616-1623. ⟨10.1016/j.pce.2011.10.010⟩ |
| ISSN: | 1474-7065 |
| DOI: | 10.1016/j.pce.2011.10.010 |
| Popis: | International audience; A thorough understanding of the energy sources used by microbial systems in the deep terrestrial subsurfaceis essential since the extreme conditions for life in deep biospheres may serve as a model for possiblelife in a nuclear waste repository. In this respect, H2 is known as one of the most energetic substratesfor deep terrestrial subsurface environments. This hydrogen is produced from abiotic and biotic processesbut its concentration in natural systems is usually maintained at very low levels due to hydrogen-consumingbacteria.A significant amount of H2 gas will be produced within deep nuclear waste repositories, essentiallyfrom the corrosion of metallic components. This will consequently improve the conditions for microbialactivity in this specific environment. This paper discusses different study cases with experimental resultsto illustrate the fact that microorganisms are able to use hydrogen for redox processes (reduction of O2,NO3 , Fe III) in several waste disposal conditions. Consequences of microbial activity include: alteration ofgroundwater chemistry and shift in geochemical equilibria, gas production or consumption, biocorrosion,and potential modifications of confinement properties.In order to quantify the impact of hydrogen bacteria, the next step will be to determine the kinetic rateof the reactions in realistic conditions. |
| Databáze: | OpenAIRE |
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