Abstract
To better control trace ammonium ion in water, an important precursor of chlorinous odor of drinking water, the oxidation characteristics and mechanisms of ammonium ion in catalytic ozonation was investigated through a serious of semi-batch oxidation experiments with a dilute aqueous solution at room temperature. Our results show that oxidation of the ammonium ion in catalytic ozonation is initiated by adsorption ammonium ion onto the catalyst surface, and that the role of hydroxyl radical is negligible. In addition, the oxidation of the ammonium ion was enhanced by some co-existing substances (i.e., chloride, calcium, acetate, and oxalate ions). That is, co-existing substances play a major role in catalytic ozonation.
