HUBER Sludgecleaner STRAINPRESS® Coarse material separator for municipal and industrial sludge

Function

Continuous screening, dewatering and transport of coarse material in one operation
Removal of coarse material from municipal sludge and industrial process water

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

It is used for liquid sludge screening or filtration of service or process water under pressure.

The system does not need any wash water as backwashing of the screen is unnecessary. The perforation and design of the screw shaft are individually adjusted to optimally suit specific requirements.

HUBER Sludgecleaner STRAINPRESS®

HUBER Sludgecleaner STRAINPRESS® for floating sludge screening

STRAINPRESS® 430 for coarse material separation oprior to a decanter

Sludge screening on a large sewage treatment plant for 4,000,000 PE

Sludge screening on a sewage treatment plant for 4 ,000,000 PE

Outdoor installation of a HUBER Sludgecleaner STRAINPRESS® 290

HUBER Sludgecleaner STRAINPRESS® applied for fermentation residue screening

Mobile STRAINPRESS® trial platform

STRAINPRESS® 430 for screening 200 m³/h primary sludge

STRAINPRESS® 290 for screening of 80 m³/h

Splittable casing

Dewatered coarse material, fibres and plastic particles from a STRAINPRESS®

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Design sketch: HUBER Sludgecleaner STRAINPRESS®

Design and Function

Design sketch: HUBER Sludgecleaner STRAINPRESS®

A pump presses the unscreened liquid through the screening zone and delivers the screened liquid to further process steps. The coarse material which is retained on the cylindrical screen is stripped off by a coaxial screw and pushed through the press zone where the material is extensively compacted and dewatered.

The screw operates only when the pressure sensors detect a differential pressure caused by screen surface blinding. The compacted material is pressed through a gap around a hydraulically operated pressure cone which closes part of the pipe end and builds up counterpressure. The counterpressure of the cone is automatically regulated inversely proportional to the screw motor load.

Easy maintenance

The complete casing, perforated plate and screw shaft of the HUBER Sludgecleaner STRAINPRESS® are made of corrosion-resistant 1.4307 (AISI 304L) stainless steel. The screw flights are reinforced with tungsten carbide for wear protection. The machine can be split in the middle and one half of the machine moved for maintenance. This allows for example to replace the perforated plate and install a screen insert with a new perforation size.

Applications

The STRAINPRESS® is used for liquid sludge screening or filtration of service or process water under pressure.

Examples for coarse material separation from:

Primary sludge
Secondary sludge
Mixed sludge
Septic sludge
Floating sludge
Grease sludge
Digested sludge
Production waste water and industrial sludges
Circulation and process water

The benefits of the HUBER Sludgecleaner STRAINPRESS®

Pressure-fed (inline) system for process water and any type of sludge including highly viscous and grease containing sludge
Increases the operating reliability of downstream sludge treatment systems, such as thickening, disinfection, stabilisation, dewatering, drying, and reduces maintenance requirements
For various applications perforations of 2 to 10 mm, different screw geometries and different material qualities are available

Pressure-dependent control of the screw shaft combined with the pressure cone regulation system allows for unattended automatic operation even with varying flow rates
Dewatering of separated coarse material to approx. 40% DR
2 sizes for throughput capacities up to 200 m³/h
More than 1,000 successful installations worldwide
Reliable cleaning of the screen without any wash water

Media

Videos and Animations

Animation: Function and components of STRAINPRESS® Sludgecleaner SP

Downloads

Customer Information and Documents

Brochure: HUBER Sludgecleaner STRAINPRESS®

More information needed?

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FAQ

Frequently Asked Questions

Typically, the HUBER Sludgecleaner STRAINPRESS® is installed after the screen and grit chamber in the inlet of the sewage treatment plant, in the primary sludge outlet to the digestion tower. It therefore separates foreign matter that has passed through the screens or that has agglomerated after the screens.

Experience has shown that a STRAINPRESS® can increase the amount of screenings in a wastewater treatment plant by up to 40% and thus significantly relieve the downstream process steps such as sludge digestion, dewatering and drying.

Due to its closed, pressure-tight design, a HUBER Sludgecleaner STRAINPRESS® can be integrated into pipe systems, i.e. it does not require an open channel. Retrofitting a STRAINPRESS® into existing systems is typically easy.

The perforated screen inserts of the STRAINPRESS® are available with hole widths of 2 mm to 10 mm, and can be replaced on site within a very short time.

The integrated press zone with automatically controlled dewatering cone dewaters separated foreign matter to approx. 35% DR content in the same work step. Therefore, no additional, downstream press units are necessary.

All types of foreign matter that do not settle in a grit trap can be separated and dewatered with a STRAINPRESS®. These include, for example, fibres and hair, wet wipes and sanitary products, leaves and wood residues, packaging residues, films and microplastics.

Because a filter cake builds up inside the STRAINPRESS®, particles smaller than the hole size of the perforated plate used in the machine are also separated.

Case Studies