Publication

Rates of microbial hydrogen oxidation and sulfate reduction in Opalinus Clay rock

Résumé

Hydrogen gas (H2) may be produced by the anoxic corrosion of steel components in underground structures, such as geological repositories for radioactive waste. In such environments, hydrogen was shown to serve as an electron donor for autotrophic bacteria. High gas overpressures are to be avoided in radioactive waste repositories and, thus, microbial consumption of H2 is generally viewed as beneficial. However, to fully consider this biological process in models of repository evolution over time, it is crucial to determine the in situ rates of microbial hydrogen oxidation and sulfate reduction. These rates were estimated through two distinct in situ experiments, using several measurement and calculation methods. Volumetric consumption rates were calculated to be between 1.13 and 1.93 μmol cm−3 day−1 for H2, and 0.14 and 0.20 μmol cm−3 day−1 for sulfate. Based on the stoichiometry of the reaction, there is an excess of H2 consumed, suggesting that it serves as an electron donor to reduce electron acceptors other than sulfate, and/or that some H2 is lost via diffusion. These rate estimates are critical to evaluate whether biological H2 consumption can negate H2 production in repositories, and to determine whether sulfate reduction can consume sulfate faster than it is replenished by diffusion, which could lead to methanogenic conditions.

À propos de ce résultat
Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.
Concepts associés (38)
Production d'hydrogène
La production d'hydrogène, ou plus exactement de dihydrogène, est en grande majorité réalisée par extraction chimique depuis des combustibles fossiles, principalement du méthane, du charbon et de coupes pétrolières. La production de dihydrogène par cette voie présente l'avantage d'un coût compétitif, mais l'inconvénient d'être à l'origine d'émissions de non biogénique, qui dépassent généralement dix kilogrammes de par kilogramme d'hydrogène produit.
Stockage de l'hydrogène
Le concept de stockage de l'hydrogène désigne toutes les formes de mise en réserve du dihydrogène en vue de sa mise à disposition ultérieure comme produit chimique ou vecteur énergétique. Plusieurs possibilités existent, qui présentent avantages et inconvénients. Sous forme de gaz, le dihydrogène est peu dense et doit être fortement comprimé. La liquéfaction du dihydrogène se réalise à très basse température. L'hydrogène solide nécessite d'être lié à d'autres composants, notamment sous la forme d'hydrure.
High-level radioactive waste management
High-level radioactive waste management concerns how radioactive materials created during production of nuclear power and nuclear weapons are dealt with. Radioactive waste contains a mixture of short-lived and long-lived nuclides, as well as non-radioactive nuclides. There was reportedly some of high-level nuclear waste stored in the United States in 2002. The most troublesome transuranic elements in spent fuel are neptunium-237 (half-life two million years) and plutonium-239 (half-life 24,000 years).
Afficher plus
Publications associées (37)

Microbial hydrogen sinks in the sand-bentonite backfill material for the deep geological disposal of radioactive waste

Rizlan Bernier-Latmani, Manon Frutschi, Nicolas Louis Maurice Jacquemin, Simiao Wang, Camille Aude Rolland, Niels Burzan, Aislinn Ann Boylan

The activity of subsurface microorganisms can be harnessed for engineering projects. For instance, the Swiss radioactive waste repository design can take advantage of indigenous microorganisms to tackle the issue of a hydrogen gas (H2) phase pressure build ...
2024

Green hydrogen production using Shewanella oneidensis MR-1 bioanode and cuprous oxide-based photocathode

Michele Morgante

In recent years, many efforts have been made to find alternative renewable energy sources that can ideally replace the use of fossil fuels in all aspects. One of the new emerging energy technologies is the bioelectrochemical system, of which two types are ...
EPFL2024

Economies of Scale in PEMEC and SOEC Manufacturing based on a Bottom-up Model

Shengyue Lu

Under the scope of net zero emission, a large-scale deployment of renewable technologies, especially clean hydrogen technologies are required. Hydrogen is a clean fuel and an ideal energy carrier that can be used to store, move, and deliver energy. Nowaday ...
2022
Afficher plus
MOOCs associés (3)
Water quality and the biogeochemical engine
Learn about how the quality of water is a direct result of complex bio-geo-chemical interactions, and about how to use these processes to mitigate water quality issues.
Sorption and transport in cementitious materials
Learn how to study and improve the durability of cementitious materials.
Basic Steps in Magnetic Resonance
A MOOC to discover basic concepts and a wide range of intriguing applications of magnetic resonance to physics, chemistry, and biology

Graph Chatbot

Chattez avec Graph Search

Posez n’importe quelle question sur les cours, conférences, exercices, recherches, actualités, etc. de l’EPFL ou essayez les exemples de questions ci-dessous.

AVERTISSEMENT : Le chatbot Graph n'est pas programmé pour fournir des réponses explicites ou catégoriques à vos questions. Il transforme plutôt vos questions en demandes API qui sont distribuées aux différents services informatiques officiellement administrés par l'EPFL. Son but est uniquement de collecter et de recommander des références pertinentes à des contenus que vous pouvez explorer pour vous aider à répondre à vos questions.