Ozone Mass Transfer Analysis in a Flash-Mix Reactor

By:
Allison Bale¹, Mohamed Gamal El-Din², Daniel W. Smith², Angelo Mazzei³, and Paul Overbeck³

1. Earth Tech Canada Inc., 17203-103 Street, Edmonton, Alberta, Canada, T5S 2C6

2. Civil and Environmental Engineering Department, 3-093 Markin/CNRL Natural Resources Engineering Facility, University of Alberta, Edmonton, Alberta, Canada, T6G 2W2

3. Mazzei Injector/GDT Corporation, 500 Rooster Drive, Bakersfield, California 93307-9555, USA

Key-words: Ozone; Mass Transfer Efficiency; Gas Phase; Liquid Phase; Venturi Injector; Flash Mix Reactor; Overall Volumetric Liquid Mass Transfer Coefficient.

Abstract

A standard product flash mix reactor was used as a secondary mixing and contact device to enhance the mass transfer of ozone gas into tap water. In this system, a venturi injector was used for initial introduction and partial dissolution of ozone upstream of the flash mix reactor. The ozone mass transfer performance of each system was measured by determining the overall volumetric liquid mass transfer coefficient (kLaInj) of the injector and the ozone transfer efficiencies of the injector and the flash mix reactor on a gas-phase basis (O3TEInj,Gas), and the ozone transfer efficiency of the entire system on a liquid-phase basis (O3TESys,Liquid) under a wide range of operating conditions. Tracer studies revealed that the injector could be modeled as a plug flow reactor and that a continuous flow stirred tank reactor model could represent the flash mix reactor. Mechanistic models were developed and tested for predicting the performance of the ozone mass transfer process in the injector and the flash mix reactor. Over the tested range of operating conditions, O3TEInj,Gas ranged from 42.3 to 92.3%. Meanwhile, the estimated gas-phase-basis ozone transfer efficiency of the flash mix reactor (O3TEFM,Gas) ranged from 7.5 to 72.5%. The estimated liquid-phase-basis ozone transfer efficiency of the system composed of an injector followed by a flash mix reactor (O3TEFM Sys,Liquid) ranged from 63 to 100%. A comparison between the performance of this ozone dissolving system and other previously investigated ozone contacting systems is presented.

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