HydroSpin - Floatables Removal Separator Brochure

Overflow events  within  a sewer system can pollute receiving waters with floatables and suspended solids, for  example plastics, papers, sanitary articles. This is evidence of insufficient cleaning of the combined sewage at CSO´s. Fixed scum-boards are standard equipment of sewer network overflows according to DWA ATV A-111 and are used to retain floatables. Often the floatables are sucked  underneath the scum-board to the overflow. That happens at rising water levels after heavy rain because of the strong turbulences and at dropping water levels because of the collected floatables in the overflow chamber. The shoreline of the receiving water is often polluted with clearly visible dirt and debris.