Filtration method

Details Filtration method Filtration method

1974-08-23

1976-09-07

Granger, Theodore A.

Liquid purification or separation

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

Responsive to fluid flow

210403, B01D 2324

Patent

active

039792897

ABSTRACT:
Filtration in an internal rotary filter system is improved by externally impacting the filter screen as it rotates with a programmed spray of liquid that is varied from a relatively low to a relatively high pressure. In certain instances, this programmed spray is controlled by an electric timer circuit so arranged that the high pressure spray is on for a period of time which does not too unduly burden the system with fluid, but which is sufficient period of time to prevent slime formation on the screen. This can for instance keep the screen free of slime when no germicidal agent (e.g. Cl.sub.2) is employed.

REFERENCES:
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patent: 1531482 (1925-03-01), Haug
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patent: 3117927 (1964-01-01), Smith
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patent: 3445286 (1969-05-01), Smith, Jr.
patent: 3542594 (1970-11-01), Smith et al.
patent: 3589521 (1971-06-01), Richter
patent: 3617441 (1971-11-01), Farrell
Process Design Manual for Suspended Solids Removal, Burns and Roe, Inc., 700 Kinderkamack Road, Oradell, New Jersey, 07649; for Environmental Protection Agency, Oct. 1971.
"Rotary-Gravity Type Screening Machines", Industrial Water and Wastes, Nov.-Dec., 1962, Scranton Publishing Co., Chicago.

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