Haloacetic acids (HAAs) is concerned pollutants for their high genotoxicity and carcinogenicity. But their efficiently total destruction in water treatment is still a major challenge due to their inertness to most treatment including AOPs. This study proposes UV(254nm) photolysis and UV-based reductive process (Sulfite/UV) to treat such pollutants. It was found that direct photolysis of chlorinated HAAs was slow, but much higher efficiency was observed for brominated and iodinated HAAs. Though total destruction was difficult by direct photolysis, it was efficiently achieved in sulfite/UV. And HAAs degradation by sulfite/UV was enhanced by increased dose of sulfite and decreased initial concentration of HAAs, as well as elevated solution pH. Mechanism study suggested that HAAs degradation was reductive radicals induced dehalogenation process, and possible degradation pathways are being  studied and will be present. The total dehalogenation of HAAs by sulfite/UV will provide some reference for halogenated pollutants removal.

Efficiently destruction of haloacetic acids by UV photolysis and UV-based reductive process

243rd National Meeting (2012)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.