Abstract
Bromate (BrO 3 −), an anion with carcinogenic properties, may be present in drinking water when bromide-containing water is ozonated during treatment or when it is present in surface water used as the source. Experiments showed that the concentration of BrO 3 − was reduced in a denitrifying bioreactor supplemented with ethanol, when NO 3 − was almost completely removed. At BrO 3 − concentrations of 25 and 35 μg/l and a temperature of 12°C the removal rates were 0.6 and 0.8 μg l −1 min −1, respectively. Calculations based on bromate concentration profiles in the bioreactor revealed that contact times of 25–50 min will be necessary to obtain concentrations below 3 μg/l, the 10 −5 cancer risk level. Furthermore, intensive post treatment of the filtrate is required to remove biomass and excess ethanol applied for complete denitrification. Therefore, bromate removal in a denitrifying bioreactor does not seem to be a realistic option in drinking water treatment. Soil passage under anoxic conditions as occurring during artificial recharge or river bank filtration may enable BrO 3 −-removal from (ozonated) surface water.
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