Bromate formation under ozonation conditions to inactivate Cryptosporidium

Ozonation has emerged as the most effective disinfectant for inactivation o f Cryptosporidium, the controlling microorganism in drinking water treatmen t. However, ozonation of waters containing bromide also produces bromate io n, a regulated DBP, leading to possible tradeoffs between microbial and che mical risk. Since higher O-3 doses will be necessary, even relatively low-b romide waters may become problematical. While effective disinfection cannot be compromised, there are methods for controlling bromate, providing a mea ns of reducing overall risk.