THRESHOLD LEVELS FOR BROMATE FORMATION IN DRINKING-WATER

Ozone is a sufficiently strong oxidant to cause the oxidation of bromi de ion and formation of bromate ion. In this study, bromate ion format ion in a wide variety of drinking water sources was analyzed, with bro mate ion formed in all sources under drinking water treatment conditio ns. Threshold levels for pH, bromide ion concentration, and ozone dose were found to be source-specific. Two non-linear empirical models wer e developed to predict bromate ion formation; these models are easy to use and require only several water quality and treatment variables. T he models were tested against several literature data and a good simul ation was found in other bench-scale tests, whereas the model tended t o under-predict bromate ion formation in pilot-scale and full-scale pr ograms.