We have combined a retractable scum concentrator arm with our peripheral dipping scum removal device for applications where high volumes of mousse-like scum accumulates and resists withdrawal from the tank by conventional means.
A typical application would be on activated sludge plants and where seasonal changes can provide high scum volumes. A suitably sized adjustable dipping scumbox is effective in removing localised scum as both head and dwell time are adjustable. For the ScumAway system, the scumbox is complemented by a retractable arm which extends across the tank radius so as to retain and concentrate the scum in the area of the scumbox.
The scraper bridge carries the scumbox actuator and the mechanism which pushes the scum arm back against the tank wall enabling the rotating bridge to pass after actuating the scumbox. After the bridge passes, the scum arm slowly returns to its operating position ready for the next cycle.