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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

Swingmill sludge dewatering mechanical process Source: Dewlink Sludge Treatment / YouTube

Swingmill sludge dewatering mechanical process

Video to demonstrate the operation of the Swingmill sludge dewatering screw press from Dewlink Sludge Treatment

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Screw presses features and blogs

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Feature

Anaerobic digestion optimization through thermal hydrolysis pre-treatment

Pre-treatment of sludge by thermal hydrolysis upstream of anaerobic digestion is used to improve AD efficiency. A study looked at (pre-)commissioning data for a full-scale AD installation undergoing upgrading with TH to assess the basis for optimisation.

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