| Abstract |
| This study analyzed the oxidation efficiency of dissolved ozone by applying different bubble sizes in relation to the transfer rate of ozone, which is a major influencing factor for the treatment efficiency of the ozone oxidation process. Air bubbles were injected into tap water to measure the oxygen mass transfer coefficient (KLa) and dissolved oxygen (DO) concentration. The dissolved ozone concentration was measured by injecting ozone bubbles into tap water. Oxidation efficiency was analyzed by injecting ozone bubbles of macro (3.7 mm), micro (44 μm), and nano (840 nm) sizes into soapy water and ink-mixed water. The smaller the bubbles, the higher the KLa, and concentrations of DO and dissolved ozone. When nano bubbles were injected, the total organic carbon (TOC) and color removal efficiencies were found to be the best at 41.7% and 90.1%, respectively. The results confirmed that for the same bubble volume concentration (BVC), the smaller the bubble, the better the material transfer and pollutant removal rates. In the case of nano bubbles, as the reaction tank grows, a stirrer device is required to confirm the mass transfer rate. |
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| Key Words |
| Ozone, Micro bubble, Nano bubble, Mass transfer cofficient(KLa), TOC, 오존, 마이크로 기포, 나노 기포, 총괄물질전달계수(KLa) |
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