| SCREENING |
 Screwscreen
The FM range of Screwscreens have been designed to meet the growing demand for effective sewage and wastewater screening. Manufactured in stainless steel and fully automatic in operation, screwscreens incorporate rugged design with an efficient screening and solids handling capability. |
Applications
Screwscreens are installed at the inlet of a wastewater treatment plant and filter the flow before it enters the works. All inorganic material is removed from the flow, washed and compacted.
The Screwscreen's unique design incorporates screening, washing, dewatering and compaction all within a single enclosure.
The unit can be easily designed into new works or retrofitted into existing plants. With a flow capacity of up to 131 L/s and a screening ability of down to 3mm, the apache range can accommodate most small to medium-sized wastewater screening situations. |
Features
- Fully automatic in operation
- Shafted screw for efficient screenings transfer
- Integrated washing and dewatering
- Pivot mounting device for ease of handling
- Heat tracing and insulation option
- Stainless steel construction throughout
- Hard-wearing materials and components
- Easy to maintain and service |
Control
The operation of the Screwscreen is based on measuring the level in the channel upstream of the screen. When a set level is reached the screen will begin operating and run until the stop level is reached. Level control will be facilitated by level probes or an ultrasonic level transmitter. The wash water operating sequence is timer controlled depending on the application. The timer will be set to optimise the washing of screenings and can be adjusted to suit each application. |
Operation
The Screwscreen incorporates three principle zones: screening, conveying and compaction.
In the screening zone the flow is filtered through a semi-circular, stainless steel basket perforated to suit the operational requirements. The screenings captured in this zone are automatically conveyed out of the flow by a rotating screw. A spiral brush attached to the screw ensures that the screening zone is adequately cleaned and that the solids are removed. Screenings are washed by high pressure washwater before entering the conveying section. Any residual faecal matter is flushed from the solids and returned to the flow.
The compaction zone is engineered to provide compaction of the screenings prior to discharge from the Screwscreen. Further washing takes place in this compartment before the screenings are ultimately dewatered with excess liquid being returned to the flow. The final screenings are clean, dry and can be discharged either to a screenings container or to an integrated bagging unit. |
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