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how an oberlin pressure filter works

Fully Automatic | 1 Micron Filtration | Dry Solids Discharge (Up to 95% Dry By Weight)

Oberlin Pressure Filters are fully automatic filters that operate at up to 40-psi differential pressure to remove solids from liquids. The result is filtrate quality down to 1 mg/L at 1 micron and dry solids discharge at up to 95%. The Oberlin Filter is extremely versatile and is able to handle both extremes of the filtration spectrum

  • High solids (1% – 20% for many applications) – If it can be pumped, it most likely can be handled by an Oberlin Filter
  • Low solids polishing – Filtration down to 1 micron. The Oberlin Filter can function as an automatic 1-micron cartridge filter.


Oberlin's Fundamental Difference

All filters utilize a force: primarily Gravity, Vacuum, or Pressure to drive fluid through a barrier (filter media) where the solids are collected.

Higher differential Pressure across the media translates to more and finer particles being removed – and a better, more efficient filter.

Differential Pressure (Delta P) of 30-40 PSI is typical of an Oberlin Filter. Competing vacuum filters struggle to achieve 7.5 psi, gravity filters are even less.

Pressure drives longer cycles, using less media and building thicker filter cakes.

Thicker filter cakes, or Depth Filtration, trap smaller particles and provide Ultra Clean Fluid.

Figure above illustrates the longer cycles times achieved by an Oberlin pressure filter, which translates to thicker cakes, cleaner fluid and less paper usage.

Before – Fly ash from a flue gas scrubber. After – Clean Water. The solids removed are in a dry cake.
A thick cake of solids that has built up inside of the filter being discharged. The dirty liquid is pumped through cakes like this on the filter media resulting in ultra fine filtration down to 1 micron.

99.99% of total suspended solids removed from liquid

The Oberlin Filter is a completely automated pressure filter that delivers clean liquids & dry solids. The Oberlin Filter has the ability to remove solid particles down to 1 micron in size.

The filtered solids are extremely dry—no further dewatering is necessary

Examples of Dryness by Solids Type

  • 75%-95% Crystalline and Rigid Shaped Particles
  • 45%-65% Diatomaceous Earth/Filter Aid Backwashes
  • 30%-40% Metal Hydroxides

Completely Automatic

The filter cleans liquids and discharges solids in a completely automated process.  An operator is not needed to remove solids or clean the inside of the filter.   The dry filtered solids discharge automatically into a bin.  This provides for greater safety when hazardous materials are involved.

Using pressure and a cake of filtered solids for ultra fine filtration

The Oberlin Filter pumps dirty liquid through a very tight media in a self-contained chamber. Solids build into a cake on the media, which catch even more solids. Pressure continues to force the liquid through the densely packed cake and media. The filtered liquid is incredibly clean with nearly all solids removed down to 1 micron in size. For a reference in scale, 70 microns is the average diameter of average human hair.

High Flow Rates

While flow rates will vary by application, the Oberlin Filter delivers high flow rates for its compact size.  For some applications, our smallest filter will have a capacity of 80 GPM and our largest filter will process 2,000 GPM. They can be grouped together for larger capacities, or full redundancy.

Large Scale Projects

The Oberlin Filter is used in large-scale projects in a variety of filtration applications including metalworking, metal-finishing, hot oil and chemical processes.  The world’s largest manufacturers rely on Oberlin to reliably deliver clean liquid for re-use or disposal, while at the same time minimizing fluid loss and solids disposal cost.

Semi-Permanent Filter Belts

Oberlin has been building paperless filters since the beginning. Our cleanable belt systems have been saving customers thousands of dollars annually in media costs. In the case of a change in application or process, all Oberlin pressure filters with belts are engineered to also use disposable filter paper.

Disposable Filter Paper

The Oberlin Filter uses up to 20 times less paper than vacuum or gravity filters. Pressure drives longer cycles, using less media and building thicker filter cakes. Thicker filter cakes, or Depth Filtration, trap smaller particles and provide Ultra Clean Fluid.

Four OPF 24 Filters in an application of filtering silicon wastewater from the grinding of solar photocells.

Reusable Belt Filter:
Coolant filtration for steel bearing grinding application. Filter cake discharge of grinding swarf shown.

Disposable Filter Paper:
Hot frying oil filtration in a coated chicken application.  Filter cake discharge of breading shown.

Animations showing the filtration process for different applications

Continuous Clean Supply Filter – Reusable Belt Animation - Coolant

Continuous Clean Supply Filter – Disposable Paper Animation - Coolant

Slip Stream Filter Animation

Wastewater Filter Animation

Continuous Clean Supply – Reusable Belt Animation