Sludge DewateringBelt Filter Press

Belt Filter Press Systems for Sludge Dewatering

Sludge management can be a dirty job, but with the right technology it doesn’t have to be. FRC’s belt filter press systems cleanly manage the entire process through automated stages of chemical preparation, gravity thickening, and belt pressing.

Constructed of stainless steel and high-grade plastics, belt filter presses are extremely resistant to fouling and corrosion. While many competitive dewatering systems employ linear designs, these systems are built with their dewatering zones stacked vertically, so equipment takes up less floor space.

Belt presses are available in sizes from 0.7 – 3.1 meters in width and flow ranges up to 16,000 gallons per hour.

How our Belt Filter Press Works

Belt Filter Press ProcessBefore sludge enters the press it is chemically conditioned for dewatering with an emulsion polymer flocculant that helps form stronger flocs. After chemical conditioning, a transfer pump drops the sludge onto a preliminary dewatering belt where free water molecules separate by gravity and fall into a collection trough.

As sludge is conveyed along the belt, ploughs roll it around to help water drain out. Before dropping down to the next stage, guide plates position the sludge towards the middle of the belt and ensure nothing is squeezed out the side of the filter. A second gravity thickener repeats the process before sludge is fed into a pressing zone.

Upon entering the pressing zone, sludge is sandwiched and squeezed between two belt filters which slowly convey over and under rollers that force excess water out of the sludge and through the filter mesh.

Finally, the pressed sludge is scraped off the belt and collected in a bin. All filtrate and wash water is captured and transferred back to the front of the wastewater system for re-processing.

Belt Filter Press Designs

PC Series

PC Series belt filter presses are compact, automated, and constructed of stainless steel and high quality plastics. They are well suited for applications up to 2,000 gph.

NPD Series

NPD Series belt presses include two gravity dewatering zones and a pressing zone. This makes them versatile across a variety of dewatering applications.

FPD Series

FPD Series belt presses are built entirely of stainless steel and enclosed to contain nuisance odors. Standard models are available up to 21,000 gph.

Why Use a Belt Filter Press?

Belt filter presses are great for dewatering applications where sludge is particulate, oily, or fatty. This covers most food processing and general manufacturing operations.


  • Low energy consumption
  • Compact footprint
  • Multi-stage dewatering
  • Continuous, automated operation
  • Reuse of DAF effluent for wash water


  • Available in width sizes from 0.7 – 3.1 meters
  • Flow ranges up to 16,000 gallons per hour

Belt Filter Press Process Diagram

PC Series Belt Filter Press

NPD Series Belt Filter Press


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