Aerating nozzle for aerating liquids containing organic substances

An aerating nozzle for aerating liquids containing organic substances comprising side walls which define a liquid channel extending between a liquid entrance (3) and a liquid outlet (8), said side walls having angles of inclination and areas of different diameters and having at least one gas entry opening in an aeration region in which said liquid channel is defined by a distribution bushing which is surrounded by an outer sleeve, said angles of inclination of all of said side walls which define said liquid channel (2) being not greater than 30.degree. relative to the longitudinal axis (13) of said aerating nozzle (9) which extends in a direction of flow (38), said distribution bushing being arranged in such a manner that it can be replaced by distribution bushings (9) that differ in number and/or size of said gas entry openings, said side walls of said distribution bushing extending parallel relative to the longitudinal axis (13), and said side walls of said liquid channel diverging before the distribution bushing and converging after the distribution bushing in the direction of flow, said gas entry openings comprising bores which extend along respective bore axes (11) which are inclined along an inflow angle .alpha. towards the direction of flow.