Patent ID: 7578397

Claim:
A device for fluid treatment, in particular for waste-water treatment, in which the fluid is led along or through at least one surface coated with material, comprising at least one wiper element ( 5 , 22 ), which brushes over the at least one surface in a pathwise course, wherein the pathwise course ( 29 , 30 ) is selected such that the at least one surface is brushed over successively in sections, and wherein the at least one wiper element ( 5 , 22 ) comprises a narrow side ( 23 ) and a wide side ( 24 ), and is guided in the pathwise course in a manner such that it alternately wipes on a first path section in a first direction essentially with its wide side ( 24 ), and then on a second path section in a second direction essentially with its narrow side ( 23 ).