Descrizione del progetto
Il ruolo della materia organica disciolta e del perossido di idrogeno nella riduzione dei microinquinanti
Il permanganato (Mn(VII)) è un ossidante selettivo ampiamente applicato nelle fasi di pre-ossidazione nel trattamento delle acque per rimuovere Mn(II), Fe(II) e sapore/odore. Produce pochi sottoprodotti di disinfezione e presenta un’elevata reattività con i composti fenolici. Le frazioni fenoliche nella materia organica disciolta producono ossidanti secondari con Mn(VII) per aumentare la riduzione dei microinquinanti, e il perossido di idrogeno (H2O2) può produrre ossidanti secondari, tra cui Mn(VI) e radicali superossidi, quando reagisce con Mn(VII). Il progetto Enhanced oxidation, finanziato dall’UE, approfondirà la cinetica e i meccanismi del ruolo di miglioramento della materia organica disciolta, dei suoi composti sostitutivi e dell’H2O2 sulla riduzione dei microinquinanti indotta da permanganato, nonché l’efficacia del Mn(II)/H2O2(/HCO3-/CO32-) per la riduzione dei microinquinanti.
Obiettivo
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.
Campo scientifico
- 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
Parole chiave
Programma(i)
Argomento(i)
Meccanismo di finanziamento
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinatore
8600 Dubendorf
Svizzera