Filtering apparatus and method
AssigneeJames Howden & Company Limited, a British Company
InventorRichard J. Wakeman
Life of this patent
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Abstract
A filtering method and apparatus including a chamber having an inlet and an outlet and a mass of fibers interposed between the inlet and outlet and contained between a perforated base and piston. Structure is provided for reciprocating the piston relative to the base during backwash operation.
Claims16
A method of filtering a liquid comprising the steps of feeding said liquid to be filtered through a mass of fibrous material in a forward direction and, from time to time, cleaning the mass of fibrous material by alternate expansion and compaction thereof, while concurrently passing a clean backwash fluid through the mass of fibrous material.
Filtering apparatus comprising a chamber, a fluid inlet and a filtrate outlet connected to said chamber, a perforated base, a perforated piston, spaced from said base, said base and piston extending across said chamber between the inlet and the outlet and defining therewith a space, a mass of fibres filling said space between said base and piston, means to positively move said piston away from and towards said base, to enlarge and reduce the size of said space, and means to cause a backwash of fluid through said space in a direction generally away the filtrate outlet and towards said inlet.
Dependencies are inferred from the claim text.