Abstract
The axial dispersion reactor ~ADR! model developed in Part I of this study was successfully validated with experimental data obtained for the inactivation of C. parvum and C. muris oocysts with a pilot-scale ozone-bubble diffuser contactor operated with treated Ohio River water. Kinetic parameters, required to model the effect of temperature on the decomposition of ozone in treated Ohio River water and oocyst inactivation, were determined from batch and semibatch ozonation experiments. The ADR model was used to simulate the effects of operating conditions ~feed-gas ozone concentration, liquid flow rate, and gas flow rate !, and water quality related parameters ~fast ozone demand, first and second order ozone decomposition rate constants, and temperature! on the performance of the pilot-scale contactor. The model simulation provided valuable insight into understanding the performance of ozone disinfection systems and recom- mendations for ozone contactor design and optimization. For example, the simulation revealed that meeting inactivation requirements for C. parvum oocysts would be more challenging at relatively lower temperatures.
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