Development of Advanced Risk-Free Process for Restoring Environmental Water Using Micro・Nano Bubbles

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(1) The superiority of the micro-bubble treatment over the conventional milli-bubble treatment was experimentally verified based on the ozone degradation of phenolic compounds thinly dissolved in water in a 1 L bubble column reactor. The results showed that the volumetric flow rate of ozonated oxygen required for the micro-bubble treatment of ozone degradation of phenolic compounds was only 1/5 of that for the milli-bubble treatment, due to the extremely high specific interfacial area and superior ozone absorption efficiency.(2) The bubble size distribution, the Sauter mean diameter dvs, the volumetric mass transfer coefficient kLa, and the oxygen absorption efficiency were measured for micro-bubble dispersion including about 20～60μm diameter bubbles. The values of the specific interfacial area and the values of gas absorption efficiency are markedly greater than those for the conventional milli-bubble dispersion.