Description du projet
Le rôle de la matière organique dissoute et du peroxyde d’hydrogène dans la réduction des micropolluants
Le permanganate (Mn(VII)) est un oxydant sélectif communément appliqué dans les étapes de pré-oxydation du traitement de l’eau pour éliminer le Mn(II), le Fe(II) et les goûts et odeurs. Il génère peu de sous-produits de la désinfection et affiche une forte réactivité avec les composés phénoliques. Les groupements phénoliques de la matière organique dissoute (MOD) produisent des oxydants secondaires avec le Mn(VII) pour renforcer la réduction des micropolluants, et le peroxyde d’hydrogène (H2O2) peut produire des oxydants secondaires, comme le Mn(VI) et le radical superoxyde, lors de sa réaction avec le Mn(VII). Le projet Enhanced oxidation, financé par l’UE, se penchera sur la cinétique et les mécanismes du rôle optimisateur de la MOD, de ses composés de remplacement et du H2O2 dans la suppression des micropolluants induite par le permanganate, ainsi que l’efficacité de Mn(II)/H2O2(/HCO3-/CO32-) en matière de réduction des micropolluants.
Objectif
Micropollutants are a serious problem for drinking water and wastewater due to their adverse human and ecosystem’s health effects. In Europe, their abatement often involves ozonation with O3 and hydroxyl radical abating a wide spectrum of micropollutants. However, the potential formation of carcinogenic disinfection byproducts such as bromate and N-nitrosamines threatens the safety of drinking water/wastewater. Permanganate (Mn(VII)) is a selective oxidant that is widely applied in pre-oxidation steps in water treatment to remove Mn(II), Fe(II) and taste/odor and produces little disinfection byproducts. It has a high reactivity with phenolic compounds. The applicant found that the phenolic moieties in dissolved organic matter (DOM) produce secondary oxidants with permanganate to enhance micropollutant abatement. Furthermore, the applicant discovered that hydrogen peroxide (H2O2) can not only produce secondary oxidants including Mn(VI) and superoxide radical when reacting with permanganate to enhance micropollutant abatement, but also reduce permanganate to MnO2 that can be removed during coagulation and filtration. Moreover, superoxide and hydroxyl radical were observed to be produced by the Mn(II)-H2O2 reaction. As another matrix, bicarbonate (HCO3–/CO32–) facilitated the Mn(II)-H2O2 reaction to achieve a fast micropollutant abatement, which shows a good application potential for reduced water sources by dosing H2O2. This project aims to investigate the kinetics and mechanisms of the enhancing role of DOM, its surrogate compounds and H2O2 on MnO4–-induced micropollutant abatement. Furthermore, the effectiveness of Mn(II)/H2O2(/HCO3–/CO32–) for micropollutant abatement will be investigated. Both processes will provide alternative enhanced oxidative treatment to abate micropollutants in water and wastewater.
Champ scientifique
- engineering and technologyenvironmental engineeringwater treatment processesdrinking water treatment processes
- engineering and technologyenvironmental engineeringwater treatment processeswastewater treatment processes
- natural scienceschemical scienceselectrochemistryelectrolysis
- natural scienceschemical sciencesinorganic chemistrytransition metals
- natural sciencesbiological sciencesecologyecosystems
Mots‑clés
Programme(s)
Régime de financement
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinateur
8600 Dubendorf
Suisse