Submersible nano-bubble generating device and method

An apparatus for producing nano-bubbles in a volume of liquid, the apparatus comprising:

• a motor comprising a rotatable shaft;
• an axially rotatable permeable member including a body having a wall and a plurality of pores through which gas introduced into the axially rotatable permeable member can flow, the axially rotatable permeable member couplable to a gas inlet configured to introduce the gas from a gas source into the axially rotatable permeable member, the axially rotatable permeable member coupled to the rotatable shaft of the motor and adapted to rotate along with the rotatable shaft;
• and
• a rotatable tube support including an elongate body having a wall and defining an inner cavity, the wall defining a plurality of perforations, the inner cavity of the rotatable tube support configured to house the axially rotatable permeable member, the rotatable tube support coupled to and rotatable along with the rotatable shaft of the motor, wherein the rotatable tube support, when rotated, is adapted to introduce the liquid into the inner cavity of the rotatable tube support and move the liquid away from an outer surface of the body of the axially rotatable permeable member, wherein the axially rotatable permeable member, when rotated, is adapted to simulate turbulent flow above the turbulent threshold in the liquid that allows the liquid to shear the gas from the outer surface of the axially rotatable permeable member, thereby forming the nano-bubbles in the liquid.