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Ultrafine bubbles (UFBs) are gas-filled bubbles with a diameter smaller than 1 μm. They are sometimes called bulk nanobubbles because these are not on a solid surface but inside a bulk liquid (water). They are already being used in commercial processes such as cleaning and plant cultivation. However, many mysteries still exist with respect to UFBs, such as mechanisms of stability, OH radical formation, and biological and medical effects. This is the first book on UFBs that reviews research done on them. It is helpful for those interested in the fundamentals of this emerging field and its applications, including cleaning, biological, medical, and dental students and researchers.
Multiphase contact apparatuses are widely used in the chemical and biocatalytic process industry in which a gaseous reactant has to be supplied. The achievement of high mass transfer rates with regard to process efficiency is mostly challenging. In this work a novel aeration technique based on fine bubbles with diameters smaller 100 µm is experimentally analyzed, providing large interfacial areas for the mass transfer process. The experiments show the benefit of using fine bubbles by reaching significantly higher mass transfer rates compared to conventional aeration. Especially stirred tank reactors prove to be most suitable for fine bubble aeration. Finally, models are developed, describing the mass transfer characteristics at microscales.
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Includes abstracts of Kagaku kōgaku, v. 31-