Purification of liquids with treated filter aid material and...

B - Operations – Transporting – 01 – D

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B01D 37/02 (2006.01) B01D 37/03 (2006.01)

Patent

CA 1142452

PURIFICATION OF LIQUIDS WITH TREATED FILTER AID MATERIAL AND ACTIVE PARTICULATE MATERIAL A B S T R A C T Disclosed is a method for removing impurities from a liquid, which method comprises passing the liquid through a filter bed comprising a mixture of fibrous filter aid material and an active particulate material. The filter aid material comprises 5 to 95%, by weight, of the bed, and has been treated with an electrolyte- type compound that produces a surface charge opposite to the normal surface charge by bonding to the surface of the filter aid material. The invention also pertains to the improved filter bed.

354601

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