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Dégradation des pesticides chlortoluron, carbofurane et bentazone en milieux aqueux par les procédés d'oxydation avancée

Abstract : The use of advanced oxidation electrochemical process: Electro-Fenton is an easy and economical way to obtain hydroxyl radical (*OH) strongly oxidizing. During this work radicals were used for the degradation of chlortoluron, carbofuran and bentazon in aqueous medium. The methodology of experimental research has been used to study the influence of some parameters (initial concentration, current intensity and processing time) on the rate of degradation and to determine the optimum conditions for mineralization. The evolution of chlortoluron concentration with processing time shows a pseudo first order kinetics (4.92 × 109, 3.24 × 109 and 2.63 × 109 mol-1.L.s-1 respectively for the chlortoluron, Carbofuran and bentazon). In our optimal conditions (pH = 3, I = 300 mA, [pesticide]0 = 0,125 × 10-3 mol.L-1 and t = 8 h), we obtain a TOC removal ratio more than 90% for the three pesticides. In the case of molecules studied, it was shown that the rate of mineralization by the photo-Fenton (UV/Fe3+/H2O2) is a function of doses of reagents used and the initial concentration of pesticides treaty. A comparison of the performance of mineralization by the different processes studied (Electro-Fenton (BDD), Electro-Fenton (PT), anodic oxidation and photo-Fenton) has shown that more than 90% of TOC removal has obtained after only 2 hours of photo-Fenton and electro-Fenton (BDD) process. Nevertheless, the comparison of cost treatment shows that photo-Fenton process is more expensive than electro-Fenton (BDD). The plasma humid air was used for chlortoluron degradation. Different catalysers (Fe2+, Fe3+ and TiO2) have been studied to improve the glidarc performances. The combination of TiO2 and Fe2+ can reach 96% of chlortoluron degradation after 3h.
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Aida Kesraoui-Abdessalem. Dégradation des pesticides chlortoluron, carbofurane et bentazone en milieux aqueux par les procédés d'oxydation avancée. Ingénierie de l'environnement. Université de Marne la Vallée, 2008. Français. ⟨tel-00742462⟩

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