Aqueous ozone decomposition kinetics in a rotating packed bed

The decomposition kinetics of aqueous ozone in a rotating packed bed (RPB) at 18 +/- 2 degrees C and in the pH range 3.0-11.0 was firstly investigated. The decomposition rate of ozone increased with increasing pH value and rotor speed. Moreover, a reaction kinetic model for ozone decomposition in RPB was developed, which can be applied for an extended range of pHs from acidic to alkaline operating conditions. It was deduced that ozone decomposition was based on pseudo-first-order kinetics with respect to the ozone concentration. The degree of the chain reaction between ozone molecule and hydroxyl ion in RPB was found higher than that in batch reactor. Furthermore, experiments showed that NO3-, Cl-, HCO3- and CO32- ions could promote the self-decomposition of ozone to some extent and the promotion effect of CO32- ion was the largest. (C) 2018 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.