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

  • 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®
HUBER sludge screening machines
HUBER Sludgecleaner STRAINPRESS® for floating sludge screening
STRAINPRESS® 430 for coarse material separation oprior to a decanter
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
Outdoor installation of a HUBER Sludgecleaner STRAINPRESS® 290
HUBER Sludgecleaner STRAINPRESS® applied for fermentation residue screening
HUBER Sludgecleaner STRAINPRESS® applied for fermentation residue screening
Mobile STRAINPRESS® trial platform
Mobile STRAINPRESS® trial platform
STRAINPRESS® 430 for screening 200 m³/h primary sludge
STRAINPRESS® 430 for screening 200 m³/h primary sludge
STRAINPRESS® 290 for screening of 80 m³/h
STRAINPRESS® 290 for screening of 80 m³/h
Splittable casing
Splittable casing
Dewatered coarse material, fibres and plastic particles from a STRAINPRESS®
Dewatered coarse material, fibres and plastic particles from a STRAINPRESS®
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Design sketch: HUBER Sludgecleaner STRAINPRESS®
Design sketch: HUBER Sludgecleaner STRAINPRESS®

Design and Function

Design sketch: HUBER Sludgecleaner STRAINPRESS®
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 1000 successful installations worldwide
  • Reliable cleaning of the screen without any wash water

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Feel free to contact us

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

HUBER Solutions in Operation

Screenings dewatered by the HUBER Sludgecleaner STRAINPRESS® from out-of-date food, packaging residues and plastics.
2022-12-09

HUBER Sludgecleaner STRAINPRESS® to ensure energy yield from digester gas plants

In order to sustainably improve the digestion process or gas production through co-substrates, as well as to protect...

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img-casestudy-lacrosse-01-bt-construction
2022-11-21 Isle La Plume, WI,
USA

From screen building to sewage sludge drying: complete modernisation of the La Crosse wastewater treatment plant with HUBER

HUBER Technology Inc., the Denver, North Carolina-based subsidiary of HUBER SE, was awarded the contract for the...

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img-casaestudy-22-05-strainpress-rome-01
2022-05-05 Rome, Italy

HUBER STRAINPRESS® Placed in the Most Impressive City in Italy: Rome

Seven HUBER Sludgecleaner STRAINPRESS® units for improved wastewater treatment for 3.5 million inhabitants: HUBER to...

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img-casestudy-19-07-digestate-removal-01
2019-07-24

Digestate Screening for Plastics Removal

Digestate is able to play an important role in soil replenishment, but can require some processing before use as an...

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img-casestudy-18-03-inline-fremdstoffabscheider-01
2018-03-19

New size of the inline sludge screening system sets new standards for throughput capacity

With nearly 1000 produced machines, the HUBER Sludgecleaner STRAINPRESS® 290 is one of the most proven HUBER products

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img-casestudy-18-02-digestion-improve-01
2018-02-21 Minworth, England

Improvement to the digestion process for one of the largest inland sewage treatment works in the UK

HUBER Technology recently completed a project at one of the largest inland sewage treatment works in the UK, Minworth...

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img-casestudy-17-03-strainpress-01
2017-03-22

Innovative Approach on the HUBER STRAINPRESS®

As the original designer and manufacturer of the world recognised and respected HUBER STRAINPRESS® pressurised sludge...

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img-casestudy-16-11-faulgaserzeugung-01
2016-11-30 Kaditz, Germany

Operationally reliable biogas production with the HUBER Sludgecleaner STRAINPRESS®

On the way from a sewage treatment works to an energy park – Stadtentwässerung Dresden undertake a variety of measures...

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img-casestudy-14-08-strainpress-amsterdam-01
2014-08-22 Amsterdam, Netherlands

STRAINPRESS® for sludge screening at Amsterdam: 3 years of successful operation

In order to remove the solids from the primary sludge in Amsterdam four HUBER STRAINPRESS® units were installed and...

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