Method of producing active filters more particularly for the tre

Details Method of producing active filters more particularly for the tre Method of producing active filters more particularly for the tre

1978-12-29

1980-06-17

Cintins, Ivars C.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 40, 210 75, B01D 1500, B01D 3702

Patent

active

042082811

ABSTRACT:
A method of producing active filters, particularly for use in treatment of water, is disclosed. A filter bed of buoyant plastic balls having a surface to which a powdered active material capable of adsorbing dissolved impurities will adhere when subjected to liquid flow rates no greater than a first value and from which the powdered active material will be removed when subjected to liquid flow rates having a second value greater than the first value is provided. A liquid containing the powdered active material is passed through the filter bed in the upward direction at a flow rate having the first value to cause the powdered active material to be distributed on and adhere to the surfaces of the plastic balls. A liquid to be purified is passed through the filter bed in the upward direction at a flow rate lower than the first value to cause impurities to be adsorbed by the powdered active material without removing the powdered active material from the surfaces of the plastic balls. The powdered active material is removed from the surface of the plastic balls after the filter has been used by passing a liquid through the filter bed in the downward direction at a flow rate having the second value.

REFERENCES:
patent: 2748077 (1956-05-01), Hodan et al.
patent: 3252899 (1966-05-01), Rice et al.
patent: 3396123 (1968-08-01), Urban
patent: 3471025 (1969-10-01), Dobson
patent: 3873581 (1975-03-01), Fitzpatrick et al.

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