Inactivation of Cryptosporidium parvum oocysts with sequential applicationof ozone and combined chlorine

Single-step inactivation experiments with ozone and monochloramine revealed the presence of a CT lag followed by pseudo-first order inactivation kinet ics. Sequential disinfection experiments with ozone followed by monochloram ine revealed that ozone pretreatment resulted in the removal of a more prom inent CT lag observed for monochloramine. In addition, the rate of inactiva tion for ozone-pretreated oocysts was approximately 2.5x greater than that observed for the post-lag phase portion of the monochloramine primary inact ivation curve.