Characteristics of Micro-Nano Bubbles and Their Application in Environmental Water Remediation

Abstract:

Micro-nano bubbles （MNBs） are more energy-efficient than traditional macro bubbles in terms of environmental water remediation because of their perfect characteristics， such as small dimension， large specific surface area， long residence time in water， high Zeta potential， strong oxidization， high mass transfer efficiency， enhancement in biological activity， and no secondary pollution. Based on the analysis of existing researches， first， the bubble classification and generation method are introduced. Next， the excellent characteristics of MNBs and the corresponding influencing factors are discussed in detail. Subsequently， the migration regulation and controlled factors of MNBs in water and porous media are analyzed， focusing on the mechanism of MNBs in remediating environmental water. Finally， a systematic review of the current status of the research on MNBs and the application in environmental water remediation is evaluated， with the promising application prospects of ozone MNBs as the priority. The future research directions of MNBs in environmental water remediation are discussed as well.

Key words:micro-nano bubbles(MNBs);migration regulation;environmental water;ozone