Effects of Ozone-Gas Bubble Size and pH on Ozone/UV Treatment |
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| Authors: | Naoyuki Kishimoto Eri Nakamura |
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| Affiliation: | 1. Department of Environmental Solution Technology, Faculty of Science &2. Technology , Ryukoku University , Otsu, 520-2194, Japan |
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| Abstract: | A series of ozone/UV treatment under injection of ozone with different ozone-gas bubble sizes was performed at pH 1.7 and 7.4. The increase in the bubble size and the decrease in pH enhanced the ozone utilization efficiency. The enhancement of ozone utilization efficiency was caused by the shift of the production pathway of hydroxyl radical (OH) from the OH production via O3 – to the UV photolysis of H2O2. The lower pH caused this shift through the chemical equilibrium of H2O2 and HO2 –, and the large bubbles caused this shift through the augmentation of H2O2 transport from the bubble surface to the bulk solution. |
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| Keywords: | Ozone 1,4-Dioxane Advanced Oxidation Process Gas Bubble Hydroxyl Radical Ozone Dissolution Efficiency Ozone Utilization Efficiency pH Photolysis Ultraviolet Light |
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