Advanced oxidations of chloroacetic acids present in drinking water

Four oxidation processes involved ozonation (O-3), ultraviolet irradiation (UV), O-3/UV and TiO2/UV to degrade mono- and tri-chloroacetic acids presen t in drinking water were compared. The results showed that ozonation was re latively inefficient for the destruction of the chloroacetic acids tested. UV irradiation was much more efficient than ozonation. But the combination of UV with either O-3 or TiO2 powder did not make much difference. It was f ound that fiber-TiO2/UV was the best combination of the four oxidation proc esses tested, especially in regards to the refractory tri-chloroacetic acid s. The TiO2 fiber was highly practical because it is easily separated and r ecovered.