Filter bed backwashing devices and methods

Details Filter bed backwashing devices and methods Filter bed backwashing devices and methods

1993-03-02

1994-02-22

McCarthy, Neil M.

Liquid purification or separation

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

Responsive to fluid flow

210 961, 210108, 210138, 210143, 210275, 210411, 210739, 210745, 210793, 210 85, B01D 2446

Patent

active

052883981

ABSTRACT:
Methods and systems of the prior art for cleansing a plurality of seriate filter cells in automatic backwash filters by backwashing the cells one at a time with backwash liquid wherein the cleansing operation on the active cell is prevented from moving to a further cell until the contaminant content of the waste liquid issuing from the previous cell reaches a predetermined low level are improved by overriding such prevention even though such content remains too high when a prescribed quantity of waste liquid has issued from the previous cell, e.g., as determined by a timer or fluid meter.

REFERENCES:
patent: 3239061 (1966-03-01), Horning et al.
patent: 4133766 (1979-01-01), Adie
patent: 4617131 (1986-10-01), Walker
patent: 4764288 (1988-08-01), Walker et al.
patent: 5089117 (1992-02-01), Nichols
patent: 5147560 (1992-09-01), Nichols

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