Apparatus for and method of filtering solid particles from a par

Details Apparatus for and method of filtering solid particles from a par Apparatus for and method of filtering solid particles from a par

1974-12-23

1976-08-31

Hart, Charles N.

Liquid purification or separation

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

Responsive to fluid flow

210 73S, 210 80, 210 82, 210 87, 210 90, 210108, 210221P, 210258, 210260, B01D 2316

Patent

active

039779700

ABSTRACT:
Waste water containing particulate matter is saturated with air or other gas by a dynamic mixer and ejected into a gravity filter system at a point above the filter media but below the water surface level. Upon entering the filter tank, the dissolved gas is released, forming small bubbles on filterable particles to float these particles to the surface for removal. The system further includes a back pressure valve at the sewage inlet port which, if obstructed, is automatically flushed. During the backwash cycle, the water level above the filter bed may be lowered to the level of a wash-through zone, and filtered water then pumped upward through the filter media, thereby carrying particles from the filter media out through the wash-through zone.

REFERENCES:
patent: 2084659 (1937-06-01), Streander
patent: 2418236 (1968-12-01), Mail
patent: 2779731 (1957-01-01), Kelly et al.
patent: 3053761 (1962-09-01), Bradt
patent: 3246763 (1966-04-01), Baum
patent: 3425936 (1969-02-01), Culp et al.
patent: 3433359 (1869-03-01), Lundin et al.
patent: 3459302 (1969-08-01), Ross
patent: 3506125 (1970-04-01), Willis et al.
patent: 3642617 (1972-02-01), Brink et al.
patent: 3642618 (1972-02-01), Silva
patent: 3828935 (1974-08-01), Rovel
patent: 3867293 (1975-02-01), Zuckerman

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