دانلود رایگان مقاله لاتین کاهش سولفات در سنگ opalinus از سایت الزویر
عنوان فارسی مقاله:
نرخ اکسیداسیون هیدروژن میکروبی و کاهش سولفات در سنگ Opalinus
عنوان انگلیسی مقاله:
Rates of microbial hydrogen oxidation and sulfate reduction in Opalinus Clay rock
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Based on an international consensus, deep geological repositories are the preferred option for the disposal of radioactive waste (IAEA, 2003). An in-depth understanding of host rock processes relevant to safety is thus required, including the impact of microorganisms under repository relevant conditions. A few European countries have opted for a repository design that consists of waste sealed in carbon steel containers that are placed in a lowpermeability Clay rock formation (ANDRA, 2005; Nagra, 2002). Steel is expected to corrode under reducing conditions at a rate of a few micrometers a year, producing iron oxide minerals (e.g., magnetite) and gaseous hydrogen (H2) (King, 2008; Marsh and Taylor, 1988). Another source of H2, but likely in lesser amounts, is the alpha-radiolysis of water after canister breaching (Le Caer, € 2011). H2 is believed to build up at higher rates than can be dissipated via diffusion. In this case, a free gas phase can form and migrate through the clay via two-phase flow or pathway dilation through the host-rock (Marschall et al., 2005). However, H2 is also known to be an excellent source of energy that can support microbial growth and activity (Nealson et al., 2005). Thus, the consumption of H2 by microbial activity could be beneficial to the longterm safety of the repository (Libert et al., 2011). In Switzerland, Opalinus Clay, a clayey rock formation, is the current candidate to host a deep geological repository (Pearson et al., 2003). Results from an in-situ experiment on hydrogen diffusion through this rock formation that took place in the Mont Terri Underground laboratory, 300 m below the surface (Thury and Bossart, 1999), suggested that H2 is being consumed by biological processes as it disappeared 20 times faster than accounted for by abiotic processes (Vinsot et al., 2014). A separate in situ experiment, carried out in the same facility, clearly showed that H2 was oxidized microbiologically through a complex metabolic network (Bagnoud et al., submitted). Thus, it is expected that hydrogen gas might be utilized in a geological underground repository if the boundary conditions allow for it. The mechanism of hydrogen utilization in a repository have been discussed elsewhere (Nagra, in prep.) and are well established, but its rate of consumption remains uncertain.
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کلمات کلیدی:
Rates of microbial hydrogen oxidation and sulfate reduction in ... https://www.researchgate.net/.../304779951_Rates_of_microbial_hydrogen_oxidation_a... Download paper (PDF): Rates of microbial hydrogen oxidation and sulfate reduction in Opalinus Clay rock on ResearchGate. Reconstructing a hydrogen-driven microbial metabolic ... - Nature https://www.nature.com › Nature Communications › Articles by A Bagnoud - 2016 - Cited by 5 - Related articles Oct 14, 2016 - In order to test this hypothesis, we use the Opalinus Clay rock formation, which .... bacteria unable to reduce sulfate but able to oxidize H2 (Fig. Reconstructing a hydrogen-driven microbial metabolic network ... - NCBI https://www.ncbi.nlm.nih.gov/pubmed/27739431 by A Bagnoud - 2016 - Cited by 2 - Related articles Oct 14, 2016 - ... a hydrogen-driven microbial metabolic network in Opalinus Clay rock. ... oxidation to carbon dioxide by heterotrophic sulfate-reducing ... Reconstructing a Hydrogen-Driven Microbial Metabolic ... - NCBI - NIH https://www.ncbi.nlm.nih.gov/labs/articles/27739431/ Oct 14, 2016 - The Opalinus Clay formation will host geological nuclear waste repositories in ... In an in situ experiment located in the Mont Terri Underground Rock ... oxidation to carbon dioxide by heterotrophic sulfate-reducing bacteria, ... Rates of microbial hydrogen oxidation and sulfate reduction in ... https://www.deepdyve.com/.../rates-of-microbial-hydrogen-oxidation-and-sulfate-reduct... Read "Rates of microbial hydrogen oxidation and sulfate reduction in Opalinus Clay rock" on DeepDyve - Instant access to the journals you need! Dams and Appurtenant Hydraulic Structures, 2nd edition https://books.google.com/books?isbn=9058096416 Ljubomir Tanchev - 2014 - Science Opalinus. Clay,. Switzerland. D. Arcos & L. Duro Enviros Spain, Barcelona, Spain T. Gimmi RWI. ... Switzerland ABSTRACT: The Pore Water Chemistry (PC) experiment, conducted at the Mont Terri Rock Laboratory (Switzerland) ... The main geochemical process is organic matter oxidation due to sulphate-reducing bacteria. Clays in Natural and Engineered Barriers for Radioactive Waste ... https://books.google.com/books?isbn=186239654X S. Norris, J. Bruno, M. Cathelineau - 2014 - Science Minerals associated with biofilms occurring on exposed rock in a granitic ... organic matter in anoxic rock extracts and in situ pore water of the Opalinus Clay. ... of oxidation and reduction of ferric oxyhydroxides; Eh–pH Pourbaix diagrams. ... Bacterial sulfate reduction above 100 8C in deep-sea hydrothermal vent sediments.
