Liquid purification or separation – Flow – fluid pressure or material level – responsive – Filter cleaning
Patent
1993-10-14
1995-12-19
Fortuna, Ana M.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Filter cleaning
210102, 210106, 210264, 210269, 210271, 210275, 210791, 210793, 210134, B01D 2446
Patent
active
054765846
ABSTRACT:
A method of cleaning a filtration tank having a plurality of side-by-side gravity flow filter cells, each having an outlet port in communication with a filtrate channel common to all of the cells in an automatic backwash/rewash system, by subjecting each compartment, sequentially, to a backwashing operation and then a rewashing operation wherein, during backwashing, backwash liquid is pumped through a first of the filter chamber ports to flow upwardly through a first of the compartments in a direction opposite to a normal filtration flow direction, and during rewashing, rewash liquid is drawn downwardly through the first cell in the normal filtration flow direction. For any given cell after a first of the plurality of cells, utilizing at least a portion of the rewash liquid from a rearwardly adjacent filter cell is used as backwash liquid in the given cell. In addition, a backwash/rewash shoe is slidable along the tank such that a backwash head and a rewash head of the shoe are continuously sealingly engageable with a pair of adjacent outlet ports. Related apparatus is also disclosed.
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Davis Water & Waste Industries, Inc.
Fortuna Ana M.
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