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US 5,476,584 AGranted
Backwash/rewash traveling bridge filter and related process
AssigneeDavis Water & Waste Industries, Inc.
InventorMack McDougald
Life of this patent
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AssigneeDavis Water & Waste Industries, Inc.
InventorMack McDougald
Estimating the term…
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.
A method of cleaning a plurality of side-by-side gravity flow filter cells in a filtration tank, each having an outlet port in communication with a filtrate channel common to all of said cells comprising the steps of subjecting each cell, sequentially, to a backwashing operation and then a rewashing operation utilizing a backwash/rewash shoe having adjacent backwash and rewash heads, said shoe slidably movable along said cells and sequentially and sealingly engageable with respective pairs of outlet ports wherein, during backwashing, a backwash pump causes backwash liquid to flow through said backwash head and a first of said filter cell ports and then upwardly through a first of said cells in a direction opposite to a normal filtration flow direction;
An apparatus for cleaning a filtration tank having a plurality of side-by-side gravity flow filter cells defined in part by a tank wall, each cell having an outlet port in said tank wall in communication with a filtrate channel common to all of said cells, by subjecting each cell sequentially to a backwashing operation and then a rewashing operation, the apparatus comprising a backwash pump utilized to pump backwash liquid through a first of said filter chamber ports to flow upwardly through a first of said cells in a direction opposite to a normal filtration flow direction;
An apparatus for cleaning a filtration tank having a plurality of side-by-side gravity flow filter cells defined in part by a tank wall, each cell having an outlet port in said tank wall in communication with a filtrate channel common to all of said cells, by subjecting each cell sequentially to a backwashing operation and then a rewashing operation, the apparatus comprising a backwash pump utilized to pump backwash liquid through a first of said filter chamber ports to flow upwardly through a first of said cells in a direction opposite to a normal filtration flow direction;
Dependencies are inferred from the claim text.