Apparatus for treating liquids

Claim 1

Apparatus for the treatment of liquid household and industrial sewages containing contaminants to effect biological purification, aeration and sedimentation comprising a shaped liquid receiving basin having therein an aerating wheel which consists of cross flow aerating channels extending radially from said wheels; said channels separated by at least one partition wall being perpendicular to to each other and forming a path returning into itself forming parallel closed aerating channels and a duct for receiving said liquid sewage and at least one propeller or rotor with axle for moving said sewage through said aerating channels, said propeller or rotor being downstream in the direction of flow in each channel behind the aerating wheel, said aerating channels having therein at least one aerator with axle and at least one fixed air blower for aerating said liquid sewage; wherein under said aerating channels are vertical aerating shafts, the depth of which is between 1 and 35 meters forming a common space and which with said aerating channels and vertical aerating shafts comprise air-injecting grids in the bottom area of said shafts for injecting air into said sewage through ducts; and wherein there are secondary sedimenters with oblique lamallae which when viewed from the top are circular, said lamallae being connected directly to said secondary sedimenters by ducts through which the aerated sewage flows in transverse flow from said aerating channels and from which the treated sewage is discharged through outflow means.