Automatic chemical cleaning of granular medium filters

Details Automatic chemical cleaning of granular medium filters Automatic chemical cleaning of granular medium filters

1989-12-18

1991-01-08

Cintins, Ivars

Liquid purification or separation

Processes

Separating

210108, B01D 2446

Patent

active

049833081

ABSTRACT:
An improved method for maintaining a granular medium filter in a clean, operable condition is disclosed. The time interval required for the level of liquid above the filter bed to drain from a backwash outlet level to the upper bed surface level following a backwash cycle is monitored. Upon this measured draindown time exceeding a predetermined interval of time, a chemical cleaning cycle is initiated for the granular medium bed filter.

REFERENCES:
patent: 3932278 (1976-01-01), Meidl et al.
patent: 4032443 (1977-06-01), Ross
patent: 4580448 (1986-04-01), Skrgatic
patent: 4617131 (1986-10-01), Walker
patent: 4627923 (1986-12-01), Ross
patent: 4764288 (1988-08-01), Walker et al.

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