Géochimie du stockage géologique du CO2 outils d’études des risques de remobilisation des métaux lourds

Abstract : Carbon Capture and Storage (CCS) is considered as potential solution to mitigate accumulation of greenhouse gas into the atmosphere. However, since many years, several works highlighted the potential environmental impact of those technologies for a long term prospective. Special focus is based on the risk of remobilisation and transfer of metals species into groundwater induced by CO2 perturbation. We performed a field experiment based on single well injection of small volume (3m3) of water-CO2 saturated. This experience was performed in aquifer presented a rock reservoir naturally concentrated in different metals species (Fe, Mn, U, As, Zn, Pb, etc.). We found that CO2 perturbation produced important quantity of carbonate, and an enrichment of several orders of magnitude in metal species concentration (Fe, Mn, Zn, As, etc.) into the groundwater. We propose that acidification due to CO2 injection induced dissolution of minerals, as a first source of metals species. Result showed different enrichment factors, depending on measured metals species. Those differences can be explained by secondary reaction of complexation of metals by carbonate species which could have increased the release of metals species into the groundwater.
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Philippe Gombert, Jean Rillard. Géochimie du stockage géologique du CO2 outils d’études des risques de remobilisation des métaux lourds. Rapport Scientifique INERIS, 2012, 2011-2012, pp.57-59. ⟨ineris-01869425⟩

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