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Filter Cake

  • Material: 73% Aluminum Oxide; mix of
  • How is it Packaged?: Loose, contained in 20-yard hopper
  • Source: by-product of anodizing process; material left on filter press
  • Location: NE Portland
  • Quantity: tons
  • If the material is FREE or does not have a set price please select one of the following:: FREE
  • Street: near NE Columbia Blvd
  • City: Portland
  • State: Oregon
  • Country: United States
  • Zip/Postal Code: 97211
  • Are you a participant of...: *ResourceFull Use
  • Listed: March 23, 2016 1:31 pm
  • Expires: This ad has expired
Filter Cake


During the aluminum anodizing process, rinse tanks are used to clean off chemicals involved in processing loads of aluminum extrusions. These tanks are flooded with fresh water; the rinse water then drains to the waste treatment system. At this point, the effluent is pH balanced to meet Oregon DEQ wastewater permit guidelines; this water (effluent) is run through the clarifier were it is infused with a polymer. The pH balancing introduces more aluminum to the blend.

The polymer “grabs” metals out of the effluent and due to its weight, settles to the bottom of clarifier as flocculent, where it is pumped out of the bottom of the clarifier and into storage tanks.

Once enough solids have accumulated, it is pumped into the filter press through a series of plates where the pressure is increased in order to push all of the water out, leaving behind material (filter “cake”) that is retained on the filter press.

It is scraped off of the plates, loaded into hoppers. The filter cake is grey-white in appearance, with a chalk-like quality, but a relatively high (80%) moisture content. The chemical make up is predominantly Aluminum hydroxide.

Ad Reference ID: 78056f2ee1565825

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  • Listed by: lrogan
  • Member Since: March 23, 2016

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