A SYSTEM AND A METHOD FOR PRODUCING A LIQUID WITH GAS BUBBLES

A system for producing a liquid with gas bubbles, the system comprising: a liquid inlet (1) for receiving a liquid stream; a gas inlet (412) for receiving a gas stream; an eductor (4) for mixing the liquid stream and the gas stream to obtain a liquid-gas mixture; a mixing column (11) having an input (114) for receiving the liquid-gas mixture and configured to provide a liquid-gas mixture with reduced size of gas bubbles at its outlet (115). The mixing column (15) comprises a stack of filling layers (111-113) comprising a plurality of porous layers (111) separated alternately by plate layers (112) and ring layers (113) of impermeable materials. Each plate layer (112) has a form of a plate that is distanced by a clearance (112a) from the internal wall of the mixing column (15) for directing the liquid-gas mixture form one porous layer (111) to the following porous layer (111) along the inner periphery of the mixing column (15). Each ring layer (113) has a form of a ring that has a central flow-through aperture (113a) for directing the liquid-gas mixture from porous layer (111) to the following porous layer (111) via the aperture (113a).