Apparatus for the degradation of pollutants in water comprising a housing (11) in which a carrier material for microorganisms is arranged, wherein the carrier material is a honeycomb filter ceramic (32), the honeycomb filter ceramic (32) has flow channels (43), the channels have a diameter of 0.3 to 2 millimeters, the honeycomb filter ceramic (32) is associated with a trickling section (16) for trickling down the water on the honeycomb filter ceramic (32), wherein the housing (11) is closed and a water inlet (12), a Water outlet (13), an air inlet and an air outlet (36), characterized in that an air enrichment section (15) and an air discharge section (17) are provided and in an upper region an overflow (30) between the air enrichment section (15) and Rieselabschnitt (16) is provided, wherein the air inlet is associated with an air distributor (23) disposed in the air enrichment section (15) is, the air enrichment portion (15) has a formed from honeycomb filter ceramic mixing element (28), which is flowed through an air-water mixture vertically upward, at the top of the mixing element (28) the oxygen-saturated water to the trickling section (28) over the overflow (30) is supplied, and an air separator (33) at the end of the trickle section (16) for removing the air from the housing (11) is provided, wherein the air separator (33) is a ceramic sponge (33), and the air outlet (36) a float switch (35) is associated, and with a sealing element (54) which closes the lower opening of the air outlet (36), and a float (53), wherein at a large air accumulation in the air discharge portion (17) of the Water level therein and thus the float (53) drops and then the sealing element (54) releases the lower opening of the Lauftauslassers (36).
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