Étude des performances des couvertures saturées pour la gestion des résidus miniers générateurs d’acide dans un contexte de changements climatiques

Authors: Gagné-turcotte, Roselyne
Advisor: Larivière, Dominic; Reynier, Nicolas
Abstract: This thesis investigates the performances of saturated covers as a waste management strategy for the prevention of acid mine drainage in the context of climate change in Canada. Two anticipated impacts of climate change were studied, namely the increase in precipitation regime variability and the increase in freeze and thaw cycles frequency. It is believed that climate change could adversely impact water quality on sites rehabilitated with saturated covers. To validate this hypothesis, two different approaches were used. Testing conditions for the experiment described in this thesis were based on the physical and chemical characteristics historically measured at the Lower William Lake site in Ontario. First, the impact of an increased precipitation regime variability on the oxidating kinetic of acid generating tailings rehabilitated using the saturated cover method was investigated from a geochemical point of view, using trickle leach columns. The chemical composition of the leachate and the evaluation of the physical, chemical and mineralogical characteristics of the tailings, measured before and after the column study, were used as performance indicators. Secondly, the impact of an increase in freeze and thaw cycles on the diffusive flux of oxygen passing through an inert material cover was evaluated using a physical approach, using a double chamber diffusion cell adapted for freezing conditions. The efficiency of the cover material to prevent oxygen diffusion was quantified by evaluating the evolution of the oxygen diffusion coefficient and the geotechnical properties of the partially saturated cover material as a function of the number of freeze and thaw cycles applied.
Document Type: Mémoire de maîtrise
Issue Date: 2021
Open Access Date: 25 October 2021
Permalink: http://hdl.handle.net/20.500.11794/70729
Grantor: Université Laval
Collection:Thèses et mémoires

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