Rotary surface aerator with adjustable liquid transporting units

A rotary surface aeration device for rotating and aerating sewage in a sewage treatment plant, having a carrying part connected to a vertically running drive axle, the carrying part has a plurality of pairs of liquid transporting units fastened to the part, each liquid transporting unit has at least one scoop and associated current guide wall, the inlet side of the liquid transporting units is below the surface of the sewage during operation and the outlet side of the units is at least primarily above the sewage surface during operation, said device is further characterized wherein each scoop is provided with scoop outlet edges, the outlet edges of the scoops of a pair of liquid transporting units, and the liquid transporting units themselves are arranged adjacent each other viewed in the circumferential direction and spaced different distances from the drive axle of said device, each pair of liquid transporting units is arranged about a rotatable vertical axle of the carrying part, the pair of units is located on a common pivot bracket having separate pivot brackets for each unit, whereby each unit can be adjusted with respect to the adjacent unit in the pair about the vertical axle of the carrying part of said device.