Influence of a fractured medium on pyrite oxidation reaction
Résumé
Fractures must be carefully considered for the geological disposal of radioactive wastes. They critically enhance diffusivity, speed up solute transport, extend mixing fronts, and in turn, modify the physicochemical conditions of reactivity in the Excavation Damaged Zone (EDZ) of the galleries. On the other hand, the pyrite oxidation could be considered like the main reaction due to the diffusion of the oxygen through the gallery. Moreover, we assume that this reaction is complete in these geological conditions. First, we propose a numerical explicit reactive transport model in a fractured medium for an overall reaction. Afterwards, we present simulations outputs of the pyrite-oxygen reaction in EDZ zone.
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