Device and method for generating gas bubbles in a liquid

A device for generating gas bubbles in a liquid in a container, comprising:

• at least one rotatable gas-permeable hollow shaft arranged in at least one container,
• gassing discs arranged on the at least one hollow shaft and spacers arranged between the gassing discs, wherein gassing discs and spacers are arranged alternately on the hollow shaft in gas-tight contact with one another,
• at least one supply line for at least one compressed gas into the interior of the at least one rotatable hollow shaft, wherein
• each of the spacers has at least one centered opening for receiving the hollow shaft and at least two chambers,
• wherein the at least two chambers are equally spaced around the centered opening,
• wherein the centered opening and the at least two chambers at least partially overlap,
• wherein the centered opening and the at least two chambers are in open communication with one another at least in the overlap region, so that the compressed gas can flow from the hollow shaft into in each case at least one of the chambers of the spacer and can enter the gassing discs from the at least one chamber of the spacer.