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Devenir de contaminants métalliques (Pb, Zn) depuis un dépôt minier ancien : développement d'un modèle de transport réactif

Samuel Mertz 1, 2 
2 Biogéosystèmes Continentaux - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327 : UMR7327
Abstract : This thesis is part of the management of old mining sites contaminated by metals and their effect on the environment. The objective of this thesis is to determine and prioritize the processes regulating the transfer of metals within old mine tailings, via the development of a reactive transport model (RTM). Firstly, a biogeochemical model was constructed to define the processes controlling the mobility of Pb/Zn from mine tailings. This model was developed via experimental microcosm leaching data acquired from a previous study, involving several treatments: (1) tailings alone, (2) addition of mine slurry, (3) addition of mine slurry and manure. The results showed that the dissolution processes of the carrier phases controlled the release of Pb/Zn. The addition of mining slurry promotes metal immobilization through the addition of iron oxides on which Pb/Zn adsorb. The addition of manure, by amplifying microbial respiration and CO2 production, promotes the lowering of pH and desorption of Pb/Zn. Secondly, a RTM was developed including: (1) a mechanistic description of biogeochemical processes and (2) solute flow and transport in a 1D medium with variable saturation conditions. It is based on data from leaching experiments on an instrumented metric column, with and without amendment. The results showed a similarity of the processes controlling the mobility of Pb/Zn between the microcosms and the metric column. The long-term fate of the tailings could be evaluated, without amendment the release of Pb/Zn will not be completed for 100 years. Nevertheless, the amended tailings immobilize Pb/Zn on a long-term basis.
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Submitted on : Thursday, June 23, 2022 - 10:09:12 AM
Last modification on : Friday, June 24, 2022 - 6:59:35 AM


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  • HAL Id : tel-03702445, version 1



Samuel Mertz. Devenir de contaminants métalliques (Pb, Zn) depuis un dépôt minier ancien : développement d'un modèle de transport réactif. Géochimie. Université d'Orléans, 2021. Français. ⟨NNT : 2021ORLE3152⟩. ⟨tel-03702445⟩



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