Strainpress Sludge Screens

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The strainpress sludge screen is a pressure-fed inline system for screening any type of sludge, including highly viscous and greasy waste.

Efficient and reliable sludge screens for removal of disturbing solids (e.g. plastics, hair and fibres) are necessary to prevent disruption of subsequent sludge treatment processes and equipment.

The strainpress Increases the operating reliability of downstream sludge treatment systems, such as thickening, disinfection, stabilisation, dewatering, drying, and reduces maintenance requirements. More than 1000 successful installations worldwide.

The systems have a capacity of up to 110 m3/h of sludge and up to 150 m3/h process water using perforations of 0.15 to 10 mm and the resultant screening will be dewatered to up to 45% DS.

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The STRAINPRESS® is a horizontal pipe-shaped coarse material separator which consists of inlet and screening zone, press zone, and a discharge section.

A pump presses the liquid through the screening zone and delivers it to further process steps or utilisation. The liquid is under pressure. The coarse material which is retained on the screen surface is stripped off by a coaxial screw and pushed through the press zone where the material is extensively dewatered and compacted. The compacted material is pressed through a gap around a hydraulically operated pressure cone which closes part of the pipe end and builds up counter pressure.

The system does not need any wash water as backwashing of the screen is unnecessary. The perforation and design of the discharge section are individually adjusted to optimally suit specific requirements. The below diagram shows the installation of the STRAINPRESS® within the wastewater treatment plant. The flow is under pressure as it streams through the STRAINPRESS®, It is therefore easily possible to integrate the STRAINPRESS® into the existing pipeline and automatic system.

Protect digesters by removal of fine fibre and screenings
Increase digester efficiency
Lower maintenance on heat exchangers and recirculation pumps
The STRAINPRESS®-system can be integrated in a closed pipeline system
Continuous coarse material separation under pressure with a loss of pressure between 0.4 and 0.6 bar
Screening, dewatering and transport of the coarse material in one operation
Washing off sludge or backwashing is not necessary
Fully-automatic continuous or intermittent operation
Compact design
Self adjusting against varying feed solids