Bromate formation under ozonation conditions to inactivate Cryptosporidium

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.