Réactivité des hydrocarbures aromatiques polycycliques dans une terre de cokerie: influence de réparation des contaminants et de l'introduction de matière organique fraîche

Abstract : The end of industrial activities associated to coal exploitation left many huge areas of wastelands especially in the Northeast of France. A former coking plant soil was studied with a combination of soil science and organic geochemistry tools in order to understand the evolution of the contaminants dynamic. In a first step, the soil and its pollution were characterized. The results showed that the fine silt fraction (2-20 µm) was the most reactive with the highest PAH concentration (extractable or occluded) and the lowest PAH availability. This fraction played a protective role toward the pollution. Moreover, solvent extractions of the anthropogenic organic matter showed that the anthropogenic organic matter was not a structuring agent between the particles in the soil. These observations were confirmed by SEM observations. In a vegetation growth context, (i) under controlled conditions with incubation of organic residue during 15 months and (ii) in situ in lysimetric plots planted with alfalfa during 6 years, the soil structure and the microbial biomass were promoted and the fresh organic matter was preferentially incorporated and stored in the fine silts. However, the pollution was not affected by the fresh organic matter addition. Both PAH concentration and availability showed a trend to decrease with the time of experiment. Thus, the fresh organic matter did not appear as a mobilizing agent for the pollution and would most probably contribute to pollution stabilization on the long term
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Audrey Pernot. Réactivité des hydrocarbures aromatiques polycycliques dans une terre de cokerie: influence de réparation des contaminants et de l'introduction de matière organique fraîche. Sciences agricoles. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0237⟩. ⟨tel-01750531⟩

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