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Orléans, France

Kervevan C.,Bureau de Recherches Geologiques et Minieres | Beddelem M.-H.,CFG Services | O'Neil K.,Partnering in Innovation Inc.
Energy Procedia | Year: 2014

The CO2-DISSOLVED project evaluates the feasibility of coupling capture and storage in saline aquifer of dissolved CO2, and geothermal heat recovery. The proposed system basically relies on the integration of a patented water-based in-well CO2 capture facility (Pi-CO2) in a classical low-enthalpy geothermal doublet. The results of this preliminary engineering design study demonstrated that (1) the use of composite materials for the wells casings would be compatible with the injection of the corrosive CO2-rich brine; (2) the housing of the Pi-CO2 system in a separate large diameter well associated with a dedicated CO2 injection line integrated in the doublet injection well is the best option for efficient CO2 capture and dissolution in brine. © 2014 The Authors. Published by Elsevier Ltd.

Blount G.,Savannah River National Laboratory | Gorensek M.,Savannah River National Laboratory | Hamm L.,Savannah River National Laboratory | O'Neil K.,Partnering in Innovation Inc. | And 2 more authors.
Energy Procedia | Year: 2014

Partnering in Innovation, Inc. (Pi-Innovation) introduces an aqueous post-combustion carbon dioxide (CO2) capture system (Pi- CO2) that offers high market value by directly addressing the primary constraints limiting beneficial re-use markets (lowering parasitic energy costs, reducing delivered cost of capture, eliminating the need for special solvents, etc.). A highly experienced team has completed initial design, modeling, manufacturing verification, and financial analysis for commercial market entry. Coupled thermodynamic and thermal-hydraulic mass transfer modeling results fully support proof of concept. Pi-CO2 has the potential to lower total cost and risk to levels sufficient to stimulate global demand for CO2 from local industrial sources. © 2014 The Authors. Published by Elsevier Ltd.

Brenot A.,Bureau de Recherches Geologiques et Minieres | Negrel P.,Bureau de Recherches Geologiques et Minieres | Petelet-Giraud E.,Bureau de Recherches Geologiques et Minieres | Millot R.,Bureau de Recherches Geologiques et Minieres | Malcuit E.,CFG Services
Applied Geochemistry | Year: 2015

The multi-layered Eocene aquifer is a regional scale sedimentary aquifer system occupying ~120,000km2 within the Adour-Garonne district (France). Local authorities have recently identified the aquifer as being at risk from extensive irrigation abstractions, threatening the sustainability of this key resource. Because large water abstractions for human activities can significantly influence the natural functioning of such aquifer systems, e.g., with leakage between aquifer layers, which can lead to water quality degradation, the characterization of such large systems constitutes a key point to protect and prevent further deterioration of aquatic ecosystems. This study provides further insight on this large aquifer through a geochemical approach, which addresses the limited number of groundwater wells where sampling is possible. For that purpose, a geochemical analysis combining two isotope systems (δ34SSO4, δ18OSO4 and 87Sr/86Sr) has been applied. The Eocene sedimentary aquifer system (detrital to carbonate deposits) is made up of four aquifer layers, Eocene Infra-Molassic sand, Early Eocene, Middle Eocene and Late Eocene, and has a mineralized area north of the Aquitaine Basin, where groundwater shows strong mineralization and anomalous levels of critical substances (SO4, F, etc.), increasing the difficulty of resource exploitation. The extreme heterogeneity of the geochemical composition of the groundwater between the aquifers and within a single aquifer is discussed in terms of the lithological control induced by the lateral variation of facies and interconnections between aquifer layers. Geochemical tools, especially the δ34S and δ18O from dissolved sulfates and the 87Sr/86Sr ratio, suggest that evaporite dissolution (both sulfate and halite) is the main process controlling the high salinity levels observed in the groundwater, explaining the spatial variations observed at the aquifer system scale. Isotopic tools also provide new information regarding the interconnections between aquifer layers, supporting the hypothesis that the Eocene aquifer system integrates groundwater from the Oligocene-Miocene aquifer through leakage effects. These new insights will likely help decision-makers adjust their choices when managing quality problems, in particular in the "mineralized area of the Entre-Deux-Mers," where targeted groundwater wells used for drinking water display anomalous levels of critical substances. © 2014 Elsevier Ltd.

Bataillon C.,Chatenay Malabry | Crusset D.,CEA Saclay Nuclear Research Center | Daumas S.,CFG Services | Diomidis N.,National Cooperative for the Disposal of Radioactive Waste
EUROCORR 2013 - European Corrosion Congress | Year: 2013

Carbon steel has been chosen to be the material for the metallic components of the high level waste (hLW) French repository. There are two main metallic components involved. One is called "liner" and its main function is to ensure mechanical resistance. The second one called "overpack", is to prevent water from reaching the vitrified HLW during the thermal phase. One of the key issues was to measure the instantaneous in situ corrosion rate of carbon steel in clay environments at 80°C under anoxic conditions. Electrochemical impedance spectroscopy (eIS) has been used to measure instantaneous corrosion rates of different types of carbon steel materials under consideration to be used in the future HLW repository concept. The measurements have been performed by connecting the carbon steel materials to a potentiostat. Potential measurements have been carried out before and after measuring the corrosion rate in order to check the stationary state, as well as, the impact of the EIS measurements on it. Water sampling has been performed for chemical and microbial analyses, to understand the corrosion processes. After four years of experiment, carbon steel materials have shown a decrease of the corrosion rate over time in clay environments. This was explained by the passivating effect of the corrosion products formed on the surface of the materials under anoxic conditions. Passivation is promoted by the confinement of the environment in contact with the carbon steel materials. Results from microbial analyses show the presence of sulphate reducing bacteria (SRB) and thiosulphate reducing bacteria (TRB). Their metabolism was confirmed by a decrease of the sulphate concentration present in clay pore water. Their impact on general corrosion was negligible. However, investigation on localised corrosion will have to be considered further after dismantling.

Randi A.,CNRS Georesources lab | Sterpenich J.,CNRS Georesources lab | Morlot C.,CNRS Georesources lab | Pironon J.,CNRS Georesources lab | And 3 more authors.
Energy Procedia | Year: 2014

The CO2-DISSOLVED project aims at assessing the feasibility of the coupling between dissolved CO2 storage in aquifer and geothermal heat recovery. The MIRAGES-2 experimental setup has been designed to study, at the centimeter scale and under relevant conditions of pressure and temperature, the chemical interactions in the near-injection well area between the reservoir rock, the cement phases, and the corrosive CO2-rich solution. This original experimental setup allows performing flow-through experiments with continuous in-situ data acquisition of pressure, temperature, flow rate, pH, and dissolved CO2 concentration. The datasets acquired will be further interpreted with the help of geochemical models, in order to better understand the effects of the key physical-chemical processes involved. © 2014 The Authors. Published by Elsevier Ltd.

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