Apparatus for dissolving gas into a liquid and method for producing the same

An apparatus (100) for dissolving gas (b) into a liquid (a), comprising a housing (110) with an inlet opening (111) for the liquid (a) and an outlet opening (112) for the liquid (a), and a blade unit (130) arranged inside the housing (110) in a small cross section area (120) between the inlet opening (111) and the outlet opening (112), wherein a flow cross section for the liquid (a) at the small cross section area (120) is smaller than at the inlet opening (111), further comprising a gas inlet (141) provided at an outside of the housing (110) and at least one gas outlet (142) provided in the housing (110) on a surface of the blade unit (130), the at least one gas outlet (142) being connected to the gas inlet (141) by means of a channel (140), and to a method for producing such an apparatus (100) and an use of such an apparatus (100).