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Efficient Inactivation of Cryptosporidium Parvum in a Static Mixer Ozone Contactor

Inactivation of C. parvum oocysts was measured in a small-scale static mixer ozone contacting system in series of challenge experiments. Measured inactivation ranged from 1.4 to 3.0 log-units, depending on the dissolved ozone by contact time product (C avg t¯) in the contactor, and was equivalent to or slightly better than that predicted for a perfect plug flow contactor with the same dissolved ozone profile. Efficient and predictable inactivation of C. parvum in drinking water may be achieved in a two-stage, continuous-flow ozone contacting system composed of a gas dissolution system employing a static mixer, and followed by a liquid phase contactor, at least at small-scale.