Cleaning Effect by Fine Bubbles Generated with Gas–Liquid Share Method

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  • Ishizaki Takahiro
    Advanced Course of Material Engineering, National Institute of Technology, Kochi College
  • Matsuda Yuto
    Advanced Course of Material Engineering, National Institute of Technology, Kochi College
  • Morita Tomoka
    Advanced Course of Material Engineering, National Institute of Technology, Kochi College
  • Nishiuchi Yusuke
    Department of Social Design Engineering, National Institute of Technology, Kochi College
  • Tada Kaori
    Department of Social Design Engineering, National Institute of Technology, Kochi College
  • Nagahara Junko
    Department of Social Design Engineering, National Institute of Technology, Kochi College
  • Hata Takashi
    Department of Social Design Engineering, National Institute of Technology, Kochi College

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<p>Recently, fine bubbles (micro/nanobubbles) have been applied for industrial use. The present study investigates oil and salt cleaning using fine bubbles. As a result, it was confirmed that, in the removal of oleic acid and salt, the removal effect was increased depending on the total surface area of fine bubbles. In oil cleaning, it was thought that the large hydrophobic interaction field was formed by the generation of fine bubbles by introducing air, and consequently the attaching action to oleic acid, which is same hydrophobic material, was effectively accelerated. In microbubbles, it was estimated that the hydrophobic interaction bridged oleic acid oil drops and coalesced them together by microbubble self-shrinkage, and it resulted in the effective separation action. On the other hand, the shortening of salt cleaning time was confirmed in fine bubble water, in comparison to the time in water without fine bubbles.</p>

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