Continuous, low-energy, low-noise sludge dewatering that runs quietly around the clock — with minimal wash water and maintenance.
A screw press dewaters sludge continuously and automatically, using a slow-turning screw to squeeze water out as sludge moves along it. Enclosed, quiet and frugal on power and wash water, it’s an ideal fit for small-to-medium STPs and ETPs that want hands-off, all-day dewatering. CWG supplies and integrates screw presses to suit your sludge.
A screw press uses a slowly rotating screw inside a cylindrical screen. Flocculated sludge enters one end; as the screw carries it forward, the space narrows and pressure rises, squeezing water out through the screen.
Filtrate drains away while a firm cake is continuously discharged at the far end — no batches, no stop-start. The low rotation speed means low energy, low noise and very little wear.
Its enclosed design contains odour and needs only occasional, low-volume screen washing — making it one of the easiest dewatering systems to live with.
Flocculated sludge is continuously conveyed and compressed along the screw, releasing filtrate and discharging a dry cake.
Sludge is flocculated so water separates cleanly during pressing.
A slow screw moves the sludge through the screen cylinder.
The narrowing pitch raises pressure, squeezing water out through the screen as filtrate.
A firm cake is continuously discharged at the outlet for disposal.
Runs unattended around the clock — no batch cycles.
Slow rotation means minimal power draw.
Enclosed, gentle operation keeps the plant pleasant.
Needs far less washing than a belt press.
Few, slow-moving parts mean long service intervals.
A small, self-contained footprint for tight plant rooms.
Continuous and low-effort; the filter press wins on ultimate cake dryness for heavy sludges.
Uses far less wash water and runs quieter, in an enclosed unit.
Much lower energy and noise, with simpler maintenance.
For the many small and medium plants that can’t justify a full dewatering hall or constant operator attention, the screw press offers continuous, low-cost sludge handling that simply runs — saving power, water and labour.
Since 1998, CWG Watch Water Technology has delivered advanced water & wastewater solutions across Pakistan — wastewater plants, RO, demineralization, softening, filtration, specialty chemicals and complete plant engineering. With decades of experience, international technology partnerships and a proven portfolio, we design customised MBBR solutions built specifically for Pakistan’s industrial requirements.
Share your sludge type and flow, and CWG will size a screw press for quiet, continuous, low-cost dewatering.
