Clarification of Effects of Parameters on the Water Purification Using Micro bubbles

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In order to make clear the effect of micro bubbles on the water purification or the water itself, we made experiments on what effect appears when adding micro bubbles on water with changing the parameters relating to the producing processes of micro bubbles. Measurements were performed in the laboratory consistently controlled lest the disturbances should affect the results. The effects of parameters were investigated under changing the producing method of micro bubbles, gas species, bubble diameter and its distribution, void fraction and temperature. The measured values in the experiments were the zeta potential, the DO, the COD and the ph values of liquid phase, the drag reduction of pipe flow caused by micro bubbles, and the washing capability.As a result, the DO value kept a saturation value when micro bubbles were supplied, the COD value also increased. On the washing ability of micro bubbles, it was found that the bubbles produced by the sharing method have some ability in washing. On the other hand, the bubbles produced by the sharing method were also effective on the drag reduction of pipe flow. The zeta potential was also affected by the producing method of micro bubbles, and the gas species in some degree.