Ozonation has emerged as the most effective disinfectant for inactivation of Cryptosporidium, the controlling microorganism in drinking water treatment. However, ozonation of waters containing bromide also produces bromate ion, a regulated DBP, leading to possible tradeoffs between microbial and chemical risk. Since higher O3 doses will be necessary, even relatively low-bromide waters may become problematical. Whileeffective disinfection cannot be compromised, there are methods for controlling bromate, providing a means of reducing overall risk.

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