Pressing Onward: A Dewatering Blog

Industrial Laundry: Where Filter Presses Fit in Your Facility Layout

By Michael Stock

According to the Textile Rental Service Association (TRSA) the US commercial textile service industry processes about 15 billion pounds of laundry a year. This laundry includes:

  • Uniforms worn by manufacturing personnel, hospital employees, and meat packers;
  • Shop towels used by service stations, printing companies, and bakers
  • Floor mats from offices, stores, and schools

You can imagine how dirty those items get. The wastewater generated from washing them contains sand and grit, lint, oil and grease, heavy metals and volatile organic compounds (VOC’s). That wastewater must be heavily treated before it can be released.


The Industrial Laundry Process


As the illustration above shows, the treatment of industrial laundry wastewater involves multiple stages. Many of the stages are even regulated by the EPA. Let's take a brief look at some of the steps:

  • Lint is removed through screening (with filter presses)
  • Grit is removed through sedimentation
  • Oils and greases are de-emulsified, coagulated and flocculated through chemical conditioning
  • Metals are precipitated by pH adjustment
  • VOC’s are removed with activated carbon treatment

All of the steps in this rather circular process produce a thickened slurry or sludge, that will often take several trips through a filter press. Since the press is used so frequently, it's best to have it in a centrally located place in your facility.


The Filter Presses

Treating industrial laundry wastewater is just one of the many uses for our sturdy and reliable J-Press ® filter presses. Depending on the size and model, our filter presses can dewater 25 - 1,000,000 gallons per day, which is a good thing in the industrial laundry business since it's so water intensive.

The J-Press ® filter press can successfully produce a filter cake of industrial laundry waste that contains 25-35% total solids. To make sure filter cake production goes smoothly, we recommend precoating the filter cloth to reduce cloth blinding and cleaning problems.

Want to learn more about our extremely versatile filter presses? Check out our guide or contact a product expert, we would love to answer any questions you have.

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