Method and system for generating nano- and microbubbles

A fine bubbles generation system for converting gas into fine bubbles in liquid, where the system comprises:

• a reactor vessel comprising gas input means, liquid input means, and liquid output means;
• agitation means arranged for agitating gas received through the gas input means and liquid received through the liquid input means, causing the liquid to take up gas in dissolved form and as first step bubbles, resulting in a first step gas-laden liquid;
• and
• mechanical interaction means arranged for mechanical interaction with the first step gas-laden liquid creating cavitation bubbles and breaking up the cavitation bubbles and first step bubbles into smaller size second step bubbles resulting in a second step fine bubble-laden liquid, where the mechanical interaction means comprise impacting surfaces comprising nanocellulose in the form of cellulose nanofibers (CNF) and/or cellulose nanocrystals (CNC),
• where the agitation means and the mechanical interaction means are arranged in the reactor vessel between the gas input means and the liquid output means, the agitation means closest to the gas input means.