0.5mm In-Channel Rotary Drum Screen - Municipal Wastewater
It can remove the scum, short fiber, suspended solids from the water intake and then discharge them after pressing.
Solids within the incoming flow will enter into the drum screen and progressively collect onto the screen mesh and cause it to gradually blind. The upstream water level will rise and at a predetermined level, the drum screen and screw conveyor will activate and rotate, immersing a clean section of the screen into the effluent.
During rotation, the solids or screenings will become inverted and then fall into the screw conveyor. Spray nozzles and a roller brush fixed to the drum screen's periphery will clean away any residual solids from the mesh surface. The screenings are conveyed, compacted, and dewatered. Depending upon the solid properties, a volume reduction of around 40% DS or greater can be achieved before disposing of the screenings into a skip or holding vessel.
A jet wash facility in the compaction zone will breakdown and remove fecal and other semi-solid or soluble mater and return it to the inlet flow. Additional jets can be installed in the transport zone to meet higher specifications of organic solids removal. Fecal matter washing efficiencies greater than 90% and screenings weight reduction of 50% can be achieved. The compactor and wash system can be omitted to suit requirements such as CSO applications where the screenings are returned to the downstream sewer.
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