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Restauration de friches minières : phytomanagement et voie d'inertage

Abstract : Since the beginning of industrialization, many wastes contaminated with metal(loid)shave been released into the environment without any management. Mining has generated huge quantities of fine, unconsolidated waste, rich in metal(loid)s, stored in tailing or in settling ponds and then left to be abandoned in the open air without any development or protection. This waste remains on site exposed to strong wind and water erosion leading to the spread of contaminated particles in the various environmental compartments (soil/sediment/water/atmosphere). First, the study of the fate of metal(loid)s in contaminated soils related to mining activity revealed the presence of associated environmental and health risks. The results highlight that (i) the geochemical behaviour of the three elements (cadmium, zinc and lead) is different, (ii) the speciation of these elements clearly changes between tailings and soils, (iii) Pb lead can cause adverse health effects for children. In a second step, two techniques for the rehabilitation of contaminated sites were apprehended: (i) in the context of soil refunctionalization, the potential for phytostabilization assisted by organic and inorganic amendments of plots contaminated with Douglas fir, as well as (ii) ex-situ recovery by attacking mining waste by alkaline way, which involves reducing the pollution source.
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Rania Hbaieb. Restauration de friches minières : phytomanagement et voie d'inertage. Sciences de la Terre. Université de Limoges; Université de Sfax. Département des sciences de la terre, 2018. Français. ⟨NNT : 2018LIMO0111⟩. ⟨tel-03058911⟩

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