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The Effect of Ozone Gas-Liquid Contacting Conditions in a Static Mixer on Microorganism Reduction |
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| Authors: | Stephen A Craik Gordon Finch Jérôme Leparc Mysore S Chandrakanth |
| Affiliation: | 1. Corresponding Author. Dept. of Civil and Environmental Engineering, Rm. 304 Environmental Engineering Bldg. , University of Alberta , Edmonton, AB, Canada , T6G 2M8;2. Deceased;3. US Filter North American Technology Center , Two Sun Court, Suite 220, Norcross, GA, 30092, USA |
| Abstract: | The effect of gas-liquid contacting conditions in a static mixer on ozone transfer efficiency and reduction of Bacillus subtilis spores was studied in an experimental ozone contactor. An empirical mathematical model was developed that related the transfer efficiency in the experimental system to the superficial liquid velocity in the mixer, the gas-liquid flow rate ratio and the height of the down-stream bubble column. Spore reduction was determined primarily by the dissolved ozone concentration-time (Cavgtm) product in the reactive flow segment and was independent of the gas-liquid contacting conditions in the static mixer. In an integrated ozone contacting system, the static mixer should be designed to maximize ozone mass transfer while the reactive flow segment should be designed for efficient microorganism reduction. |
| Keywords: | Ozone Static Mixers Bacillus subtilis Spores Microorganism Reduction Transfer Efficiency Hydrodynamics Mass Transfer |
