Pulsing portions of a filter cell to extend a filter run

Details Pulsing portions of a filter cell to extend a filter run Pulsing portions of a filter cell to extend a filter run

1989-12-14

1990-12-11

Hart, Charles

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210108, 210264, 210795, C02F 100

Patent

active

049768735

ABSTRACT:
An improved method for operating a down-flow granular medium filter is disclosed which increases the effective filtration time between backwashes. The filter tank cell is divided into a plurality of subcells, each individually adapted and controlled for periodic intermittent upwardly-directed pulses of fluid passed through the filter bed within each subcell from an array of orifices beneath or in the bed. During the filtration run, one subcell is pulsed to improve the porosity of that portion of the filter bed while the remainder of the subcells continue to filter wastewater. After initiation of the first pulsing cycle for a subcell, additional subcell pulsing cycles are initiated sequentially. At the end of the filtration run the whole filter cell is backwashed to remove particulate matter from the bed and prepare the bed for the next filtration run.

REFERENCES:
patent: Re28456 (1975-07-01), Ross
patent: 3459302 (1969-08-01), Ross
patent: 3516930 (1970-06-01), Ross
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patent: 4032443 (1977-06-01), Ross
patent: 4627923 (1986-12-01), Ross
patent: 4693831 (1987-09-01), Garzonetti
patent: 4818414 (1989-04-01), Ross
patent: 4859330 (1989-08-01), Pauwels

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