Features and structure
A QUILTON screw screen compact plant has the following structural and mechanical specifications:
- 30-45º angle of positioning.
- No building works.
- Bespoke design.
- Possibility of deploying mobile units.
- Type of materials: stainless steels AISI-304, AISI-316, duplex 2205, super duplex 2507, etc.
- Fully automatic operation.
- Totally enclosed discharge trough.
- Bagging unit (optional) that avoids the emission of odours from compacted wastes.
- Completely hermetic from the screening area through to the discharge trough.
- Brush on the spiral for the self-cleaning of the screening area.
COMPONENTS OF THE SCREW SCREEN COMPACT PLANT
A QUILTON screw screen compact plant basically has the following five components:
- Tub: stainless-steel structure containing the screw screen and flanged inlet, outlet and spillover connections.
- Filtering area: this is the part of the screw screen that is connected to the tub and through which the wastewaters flow. It consists of a steel screening basket with perforations (3-10 mm in diameter) and a spiral on its lower end to provide continuous cleaning of the screening area.
- Waste transport or lifting area: this is the middle part between the filtering and discharge areas. It involves a tubular trough and a screw conveyor.
- Pre-compacting and compacting area: this is the last and highest part of the screw, and as its name indicates, it is the area where the screened solids are moved, washed and compacted by the extraction screw. It leads to the discharge trough.
- Operation: this involves a low-rev gear motor mounted on the top of the unit.
The station is flange-fed, and the wastewater flows to the screw screen. Lateral watertight gaskets provide the seal and fit with the tub and the water passes through the screen. Those solids larger than the spacing are retained while the water flows through the holes on the perforated sheet and filtering area on the screen.
The solids are retained in the screen’s filtering area, which is cleaned by a brush mounted on the spiral, which at the same time conveys the wastes retained in an upward direction and compacts them in its end zone.
As the solids are raised, they are dried and compacted before being offloaded into a skip. The liquid drained from the pressing is collected and returned to the screening basket through a flexible hose.
Options in assembly and maintenance