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Do Ultrafine Bubbles Work as Oxygen Carriers?

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Ultrafine bubbles (UFBs) do not act as oxygen carriers. Oxygen supersaturation in fine bubble (FB) dispersions results from the dissolved oxygen state during FB generation, not the bubbles themselves.

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Area of Science:

  • Fluid dynamics
  • Physical chemistry
  • Water treatment technologies

Background:

  • Fine bubbles (FBs), including ultrafine bubbles (UFBs) and microbubbles (MBs), are known for efficient aeration.
  • The role of dispersed UFBs as oxygen carriers and the cause of oxygen supersaturation in FB dispersions remain unclear.

Purpose of the Study:

  • To investigate whether UFBs function as oxygen carriers.
  • To determine the cause of oxygen supersaturation in FB dispersions.

Main Methods:

  • FB concentration and oxygen content were measured using particle analyzers and a developed oxygen measurement method.
  • Experiments evaluated UFB behavior in degassed water, storage effects (temperature, lid), and simultaneous FB generation and oxygen content measurement.

Main Results:

  • UFBs did not diminish in degassed water and showed no correlation with oxygen content changes during storage.
  • Oxygen content in UFB dispersions decreased over time similarly to oxygen-supersaturated water.
  • Dispersed MB and UFB concentrations did not explain oxygen supersaturation during FB generation.

Conclusions:

  • UFBs (100-200 nm) do not act as oxygen carriers.
  • Oxygen supersaturation in FB dispersions is attributed to the dissolved oxygen state achieved during the FB generation process, not the bubbles themselves.