Micro and nano-sized bubbles for sanitation and water reuse: from fundamentals to application

Highlights

● MNBs can enhance other water purification methods.

● MNB technology is its ability to eliminate pathogens in water and wastewater sources.

● The stability or MNBs and oxygen transfer depend on the size of bubbles.

● Ozone-MNBs provide an efficient and cost-effective approach to wastewater treatment.

Abstract

The global scarcity of drinking water is an emerging problem associated with increasing pollution with many chemicals from industry and rapid microbial growth in aquatic systems. Despite the wide availability of conventional water and wastewater treatment methods, many limitations and challenges exist to overcome. Applying technology based on microbubbles (MBs) and nano-bubbles (NBs) offers ecological, fast, and cost-effective water treatment. All due to the high stability and long lifetime of the bubbles in the water, high gas transfer efficiency, free radical generation capacity, and large specific surface areas with interface potential of generated bubbles. MBs and NBs-based technology are attractive solutions in various application areas to improve existing water and wastewater treatment processes including industrial processes. In this paper, recent progress in NBs and MBs technology in water purification and wastewater treatment along with fundamentals, application, challenges, and future research were comperhensively discussed.

Graphical abstract

Keywords

Nanobubbles / Microbubbles / MNB / Wastewater treatment / Water pollution utilization

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Acknowledgements

The authors are grateful for the financial support from the Shanghai Cooperation Organization Science and Technology Partnership Program and the International Science and Technology Cooperation Program (No. 2022E01015), and the Tianchi Doctor Program of Xinjiang Uygur Autonomous Region, China (No. E33H6301). Auhors would like to thank Joshuah Tavarez from Adelphi University for proofreading.

Conflict of Interests

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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