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Développement et évaluation d’une méthode à base de mousse pour l’oxydation améliorée de sols insaturés contaminés par des hydrocarbures

Abstract : Soil and water pollution by persistent organic contaminants is a worldwide concern, given health and environmental hazards. Hence, the remediation of sites polluted by these toxic and recalcitrant contaminants is a major issue. Many heavy hydrocarbons, like tars, are often tightly adsorbed onto soils, the latter becoming hydrophobic, restricting access of water-based amendments during in situ treatments. In situ chemical oxidation combined with the use of surfactants (S-ISCO) is effective to overcome this problem. However, S-ISCO is limited by the short contact time between oxidant solution and low available contaminants, especially in permeable vadose due to gravity effects. This work is part of the ANR MOUSTIC project. It aimed to develop an injection method for the distribution degradation reagents, compatible with the presence of surfactant and for the selective degradation of pollutants, going beyond gravity effects and permeability or wettability contrasts of the contaminated medium. A preliminary study was carried out in PAH-contaminated solutions, to study the effect of surfactants and temperature on the selective oxidation of targeted pollutants by persulfate. Then, we have developed a foam-based method, which allows to distribute persulfate uniformly and persistently in anisotropic, unsaturated soils contaminated by coal tar, while preserving the selective oxidation of hydrocarbons. This method was successfully assessed in 2D-sandbox using tar-contaminated model soils consisting of glass beads and soil material. Oxidant distribution using this method was systematically compared to traditional liquid solutions to assess its efficiency. At last, the interest of this new method was checked in columns in disadvantageous conditions and compared to usual methods.
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Iheb Bouzid. Développement et évaluation d’une méthode à base de mousse pour l’oxydation améliorée de sols insaturés contaminés par des hydrocarbures. Chimie organique. Université Bourgogne Franche-Comté, 2019. Français. ⟨NNT : 2019UBFCD001⟩. ⟨tel-02550961⟩

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