Abstract
As ultrafine bubble (UFB) water becomes widespread in society, it is extremely important to see if the UFB water can be treated like a popular aqueous solution. The most fundamental handling includes storage, transportation, concentration, dilution and removal. Although the number concentration of UFBs gradually decreased even in an environment where it was allowed to stand at room temperature, it maintained about a few hundred million/mL for several months. There was also no significant decrease in number concentration due to the international transportation between Japan and Germany. The UFBs in water could be concentrated by vacuum evaporation method or very slow forward partial freezing method. Furthermore, UFB water could be diluted with ultrapure water. The UFB number concentration distribution hardly changed in these various concentration adjustment operations. The UFBs were removed from UFB water by ultrasonic irradiation in the MHz band.
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