Bromate formation during ozonation of bromide containing drinking water - a pilot scale study

The effect of bromide ion concentration, pH, temperature, alkalinity, and hydrogen peroxide content on bromate formation was studied. Increase in pH was found to give the greatest increase in bromate formation. Also increase in the ozonation temperature, bromide ion concentration and hydrogen peroxide content increased the observed bromate concentration. Only increased alkalinity decreased the bromate formation during the ozonation experiments. Bromate formation exceeded the EU limit value for bromate ion, 10 mug/l, when the initial bromide ion concentration was around 100 mug/l, except for the alkalinity of 1.4 mmol/l, when the bromate formation was 9.4 mug/l.