Purification of liquids with treated filter aid material and active particulate material
AssigneeEcodyne Corporation
InventorChristopher J. Halbfoster
Life of this patent
Estimating the term…
Abstract
A method and filter bed for removing impurities from liquids wherein the filter bed comprises a mixture of treated filter aid material and an active particulate material having opposite surface charges in aqueous suspension. The filter aid material has been treated to produce the desired surface charge. The identity of the active particulate material depends on the application. Examples are organic polymeric absorbents, zeolites, bentonite, zirconium oxide, zirconium phosphate, activated alumina, ferrous sulfide, activated carbon and diatomaceous earth.
Claims20
A method for removing impurities from a liquid comprising:
- passing said liquid through a filter bed comprising a mixture of treated fibrous filter aid material and an active particulate material, said treated filter aid material and said particulate material having opposite surface charges in aqueous suspension, and said mixture producing a clumping phenomenon, wherein said filter aid material comprises about 5 to 95% by weight, of said bed, and wherein said filter aid material 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 said filter aid material.
A method for removing impurities from a liquid comprising:
- passing said liquid through a filter bed comprising a mixture of treated cellulose fibers and activated carbon particles, said carbon particles having a negative surface charge, and said mixture producing a clumping phenomenon, wherein said cellulose fibers comprise about 5 to 95%, by weight, of said bed, and wherein said cellulose fibers have been treated with an electrolyte-type compound that produces a positive surface charge by bonding to the surface of said fibers.
An improved filter bed comprising a mixture of treated fibrous filter aid material and an active particulate material, said treated filter aid material and said particulate material having opposite surface charges in aqueous suspension, and said mixture producing a clumping phenomenon, wherein said filter aid material comprises about 5 to 95% by weight, of said bed, and wherein said filter aid material has been treated with an electrolyte-type compound that produces a surface charge opposite to the normal surface chharge by bonding to the surface of said filter aid material.
An improved filter bed comprising:
- a mixture of treated cellulose fibers and activated carbon particles, said carbon particles having a negative surface charge, and said mixture producing a clumping phenomenon, wherein said cellulose fibers comprise about 5 to 95%, by weight, of said bed, and wherein said cellulose fibers have been treated with an electrolyte-type compound that produces a positive surface charge by bonding to the surface of said cellulose fibers.
Dependencies are inferred from the claim text.