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Screw presses

A screw press provides sludge dewatering by passing the sludge along the inside of a permeable cylinder. It uses a slowly-rotating (~5 RPM) Archimedean screw within a cylindrical screen (otherwise termed drum filter/screen or basket). It is normally inclined by ~20° to the horizontal to assist with the draining of water into the sump, and the screen aperture rating is generally below 0.5 mm.

Screw presses related videos

Benenv Screw press for sludge dewatering Source: Joseph Chahwan / YouTube

Benenv Screw press for sludge dewatering

Film to demonstrate the stacked screw sludge dewatering machine from Benenv.

This solid-liquid separation equipment can be used for applications including municipal sewage, petrochemical, food & beverage, slaughterhouses and breeding, printing and dyeing, papermaking, leather, pharmaceutical and other industries.

The equipment is suitable for high and low concentration sludge (from 2000mg/L), and for all kinds of sludge with high and low viscosity, especially oily sludge.


Screw presses features and blogs

Fig. 4.  SP filtrate and acidified sludge samples

Phosphorus recovery by sludge acidification and dewatering

A pilot-scale Danish study of phosphorus extraction from acidified anaerobic and aerobic sludge samples has revealed removal to be more effective from anaerobic sludges, even though the digested sludge alkalinity increases the total acid demand.

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