Manufacturer: Komline-Sanderson


The Komline-Sanderson Kompress Belt Filter is a broadly applicable product for dewatering municipal Biosolids and industrial sludges.

What is a Belt Filter Press?

A Belt Filter Press is a Biosolids/sludge dewatering device that applies mechanical pressure to a chemically conditioned slurry, which is sandwiched between two (2) tensioned belts, by passing those belts through a serpentine of decreasing diameter rolls. The machine can actually be divided into three (3) zones: gravity zone, where free draining water is drained by gravity through a porous belt; wedge zone, where the solids are prepared for pressure application; and pressure zone, where medium, then high pressure is applied to the conditioned solids.

Typically, a belt filter press receives a slurry ranging from 1-4% feed solids and produces a final product of 12-35% cake solids. Performance depends on the nature of the solids being processed.

Product Range and Application

Komline-Sanderson's Kompress Series III Belt Filter Press is available in a three-belt (Model G-GRSL), a two-belt (Model GRS) and an extended gravity two-belt (Model GRSL) design. The three-belt G-GRS press has an independent gravity zone with a more open belt for more rapid drainage of the volume of water. The extended gravity design has a longer gravity drainage zone. Selection of the basic machine is a function of the type of sludge and feed solids.

Superior Features for Better Dewatering: The features that enable the Komline-Sanderson Series III Kompress to achieve substantially higher production rates and produce high cake solids at discharge are:

  • The use of the Roto-Kone® technology in the gravity zone
  • A wedge section with an adjustable angle of conversion of the belts
  • A large initial drum in the pressure/shear zone
  • An extended length pressure/shear zone
  • A choice of 2 belt or 3 belt dewatering systems
  • A design that allows the 3 belt design to be a combination thickener or dewatering system
  • A variable orifice polymer/sludge mixing valve to optimize polymer conditioning
  • Larger standard filtration areas for greater process throughput and higher cake consistency
  • A patented high rate drainage system that dramatically improves filtration rates
  • An easily adjustable, variable wedge compression zone that maximizes process rate and performance
  • A high performance, larger to smaller drum pressure profile for higher cake solids concentration
  • High quality structural frame materials and components for trouble-free, long lasting operation

Kompress Design Features:

  • High quality structural frame materials and components for trouble-free, long lasting operation.
  • K-S custom designed and built instrumentation/controls for guaranteed system integrity
  • Outstanding operating features and technology advances for higher throughput capacity, lower operating cost, and easier maintenance
  • Highly efficient gravity zone with Roto-Kone® elements and Roto-Trak® plows that work sludge to promote rapid drainage
  • Feed section features flocculation tank and feedbox to uniformly apply sludge across entire width of belt while eliminating uneven distribution
  • Rack and pinion tension controls links both ends of take-up roll to assure parallel belt movement and prevent uneven belt tension
  • Self-bailing perforated first dewatering drum eliminates rewetting of the cake through removal of water from inside the drum
  • Gravity and wedge zone belt support bars are made of abrasion-resistant polyethylene and enhance dewatering by breaking surface tension of liquid
  • Heavy-duty 10x frame is 3/8" carbon steel hot dipped galvanized after welding. 304 and 316 stainless steel frames are available
  • Patented lifting mechanism in the high rate drainage system facilitates raising and lowering of plows and elements into or out of service
  • Built in safety rope surrounds the entire system for emergency shutdown. Additional automatic shutdown controls stop the system for low pneumatic/hydraulic pressure, gross belt misalignment or broken belt, drive failure or low belt wash pressure
  • Continuous belt washing is provided by fully enclosed wash stations with high pressure SS spray nozzles, internal cleaning brushes, special seals to eliminate noise and overspray, and access panels for convenient maintenance
  • Variable wedge compression zone can be easily adjusted during operation to set a dewatering gap that maximizes material process rate and performance
  • Replaceable polypropylene discharge blades extend over entire belt width and are counterweighted. Dry cake discharge is standard with optional discharge for thickened, pumpable sludge
  • Heavy duty split pillow block spherical roller bearings are all one size. A highly effective sealing arrangement protects bearings from external contaminants and water
  • A choice of 2 or 3 belt dewatering systems with standard, extended, or independent gravity zones for consistently high cake solids in varying sludge conditions
  • 2-belt system with standard gravity zone (GRS)
  • 2-belt system with extended gravity zone (GRSL)
  • 3-belt system with independent gravity zone (G-GRSL)


Applications Include: 



  • Primary
  • Primary & Trickling filter
  • Primary & WAS
  • WAS
  • Contact Stabilization
  • Primary & RBC

Anaerobically Digested

  • Primary
  • Primary & Trickling Filter
  • Primary & WAS
  • Primary & RBC

Aerobically Digested

  • Oxidation Ditch
  • Primary & Activated
  • Contact Stabilization
  • Extended
  • Primary & RBC
  • WAS

Potable Water Plant

  • Alum Sludge
  • Lime Softening Sludge
  • River Water Silt


  • Food Processing Wastes
  • Pulp & Paper Wastes
  • Chemical Sludges
  • Pharmaceutical Wastes
  • Industrial Wastes Processing Sludges
  • Petrochemical Wastes

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