Environmental applications of nanobubble technology: field testing at industrial scaleEnvironmental applications of nanobubble technology: field testing at industrial scale Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2022-11-042021enThe authors would like to acknowledge the partial financial support of the project nanoBT (EU's ERA-MIN2 program: Research & innovation programme on raw materials to foster circular economy).Nanobubble (NB) technology has advanced significantly over the last two decades. Many theoretical and technological advances have been made, including the development of novel devices for NB generation. Proof of principle has been demonstrated primarily at laboratory scale and very encouraging results have been obtained. Yet reports on applications in the field (for ecosystem restoration) or at industrial or large pilot scale (for wastewater treatment) are lacking. In this paper, five field applications of an industrial strength nanobubble generator are presented and key environmental quality parameters have been measured and are presented here. The results indicate the highly successful application of NB technology; however, in most cases the lack of benchmarking does not allow for a quantitative comparison of the benefits of this technology. However, the presented results provide convincing evidence that NB technology works beyond the bench scale in the field and in industrial testing trials. For example, a 1600 m3 winery wastewater pond was fully restored in 10 weeks and the energy required for COD removal was estimated at 0.515 kWh/kg-COD. The presented results are a strong indicator of the potential success of the NB technology in environmental applications.http://creativecommons.org/licenses/by/4.0/The Canadian Journal of Chemical Engineering99112345–2354 Kalogerakis Nikos Καλογερακης Νικος Kalogeraki Georgia-Kalypso Καλογερακη Γεωργια-Καλυψω Botha Quartus Paulus Wiley Bioremediation Ecosystem restoration Nanobubbles Oxygenation Ultra fine bubbles