Descripción del proyecto
El papel de la materia orgánica disuelta y el peróxido de hidrógeno en la eliminación de microcontaminantes
El permanganato [Mn(VII)] es un oxidante selectivo que se aplica ampliamente en los pasos previos a la oxidación del tratamiento del agua para eliminar Mn(II), Fe(II) y el gusto u olor. Genera pocos subproductos de desinfección y posee una elevada reactividad con compuestos fenólicos. Las fracciones fenólicas en la materia orgánica disuelta (MOD) producen oxidantes secundarios con Mn(VII) para incrementar la eliminación de microcontaminantes, y el peróxido de hidrógeno (H2O2) puede producir oxidantes secundarios como Mn(VI) y un radical superóxido al reaccionar con Mn(VII). El equipo del proyecto financiado con fondos europeos Enhanced oxidation investigará la cinética y los mecanismos de la función potenciadora de la MOD, sus compuestos sustitutivos y el H2O2 en la eliminación microcontaminantes inducida por permanganato, así como la eficacia de Mn(II)/H2O2(/HCO3-/CO32-) para la reducción de los microcontaminantes.
Objetivo
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.
Ámbito científico
- 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
Palabras clave
Programa(s)
Régimen de financiación
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinador
8600 Dubendorf
Suiza