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Chimie de l'eau et transport particulaire dans un crassier sidérurgique : de la zone non saturée à la zone saturée

Abstract : Mobile soil particles can transport pollutants to groundwater. In slag heaps, leached metallic elements contribute to soil water contamination. The aim of this work is to identify the role of slag particles in contaminant transport under unsaturated and saturated conditions. Mineralogical compositions and physicochemical properties of slags are first determined. The analysis show high temperature slag phases and weathering phases. Percolation tests are also carried out in repacked waste columns under infiltration/drying cycles to find out the effects of dry periods on in situ particle mobilization. Preferential flows lead to rapid transport of solute through the repacked column in vadose zone. Leachates are characterized by high pH and high concentrations of calcium, aluminum and silicon, molybdenum, chromium in the fusion slags. Speciation calculations showed that the leachates are saturated in calcium silicate hydrates. Laser size analyzer shows that the slag particles mobilized during the simulated rain events are around 200 µm, which suggests low mobility in the less permeable underlying formations.
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Orianne Houecande. Chimie de l'eau et transport particulaire dans un crassier sidérurgique : de la zone non saturée à la zone saturée. Autre. Université de Lyon, 2016. Français. ⟨NNT : 2016LYSEM022⟩. ⟨tel-01665166⟩

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