La matière organique dissoute issue de sols contaminés par des goudrons de houille : vers une meilleure compréhension de sa nature et de sa réactivité

Abstract : A large amount of wastelands inherited from former industrial activities contains persistent organic contamination (coal, coal tar…). While the regulation requires an evaluation of the contamination degree of these soils, it doesn’t take into account the transformation by-products such as polar compounds, poorly studied. Yet they solubilize in aqueous phase by percolation of meteoric waters through these contaminated sites. Despite the fact that literature targeting the fresh DOM is abundant, it is not directly transposable to the anthropogenic DOM coming from wastelands, which still need to be more precisely defined to improve our knowledge of this specific DOM and its evolution over time. A multi-technical approach was developed to comprehend the anthropogenic DOM coming from former coking and gas plant soils, thanks to a combination of laboratory experiments (under controlled conditions) and on field devices (lysimeters). Their study show that they contained high polycyclic aromatic compound (PAC) contents, whose proportions in polar PACs exceed the ones in soil measurements. However, these PACs only consist of a low proportion of the total DOM. Complementary experiences targeting the influence of some parameters (pH, hydrophobicity) show a major hydrophobic characteristic and suggest a strong link between the pH and the spatial DOM organization. Artificial aging experiences show an enrichment in polar compounds leading to their water mobilization
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Ogier Hanser. La matière organique dissoute issue de sols contaminés par des goudrons de houille : vers une meilleure compréhension de sa nature et de sa réactivité. Sciences de la Terre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0019⟩. ⟨tel-01751422⟩

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