- Coarse Screening
- Fine Screening
- Step screen
- Rotary Drum Screen
Above channel (Milliscreen) - Rotary Drum Screen
Below channel (Suboscreen) - Screen Compactor
- Inclined Drum Screen (Versa)
- Curved Fine Rake Screen
- Flat Fine Rake Screen
- Minyscreen
- Externally Fed
Rotary Screens - Centre-Flo Band Screens
- Screen Screw
Compactor – Vertical
- Filtration / Microscreening
- Septage Receiving
and Screening - Grit
- Combined Inlet Works
- Sludge Thickening
and Dewatering - Conveyors and Compactors
- Prefabricated and
Moveable Gantry
Inclined Drum Screen (Versa)
Johnson Screens® Inclined Rotary Screen – Versa design is unique in the sense that the inlet end of the screen does not have a bearing and also does not have any fixed or rotating arms; the inlet end of the screen is free. The Versa design also results in a lower headloss across the screen. It is an integrated piece of equipment consisting of a screen drum, a screw conveyor and compactor.
During operation, solids in the incoming flow greater than the opening size progressively collect inside the screen drum causing it to gradually blind. The upstream water level rises on account of the reduction in open area and at a predetermined level differential, the screen drum and screw conveyor start rotating while immersing a clean section of the screen into the effluent.
The rotating action of the screen drum causes solids or screenings to be lifted up and dropped into the screw conveyor trough. Spray nozzles and a roller brush (installed on perforated plate screens) fixed to the periphery of the screen drum cleans away any residual solids from the screen surface.
As the water level falls, the screen drum will also stop rotating. However the screw conveyor will continue to rotate for a predetermined length of time to convey all residual solids into the compaction zone before it stops.
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