Patent ID: 8152998
Filing Date: 2012-04-10
Classification: B01D

Abstract:
1. A continuous, screenless, self-cleaning liquid filtering apparatus comprising: a vessel having a bed of filtration material, an intake for introducing unfiltered liquid into an upper region of the vessel, a washbox assembly comprising an airlifting tube extending from the washbox comprising an expulsion end within the washbox and an intake at a lower end opposite from the washbox, a reject outlet pipe fluidically communicating the washbox with a reject box; a central pipe extending along an outside surface of the airlifting tube from a position just below the washbox to a position just above the intake end; an effluent riser pipe extending along an outside surface of the central pipe from a position just below the washbox to a position above the intake end; first and second effluent chambers, the first effluent chamber defined by an outer surface of the effluent riser pipe, a bottom plate of an upper inverted cone, and an inner surface of the upper inverted cone, and the second effluent chamber defined by an outer surface of the central pipe, a bottom plate of a lower inverted cone, and an inner surface of the lower inverted cone, the upper and lower inverted cones being substantially concentric and vertically spaced apart components of a baffle assembly, the upper inverted cone connected to the outer surface of the effluent riser pipe and fluidly connected to the first effluent chamber, the lower inverted cone connected nearer to the bottom of the effluent riser pipe than the upper inverted cone and fluidly connected to the second effluent chamber; an effluent collector fluidically communicating the effluent chambers with a location outside of the liquid filtering apparatus; and a deflector connected either to an internal surface of the vessel or to a lower periphery of the lower inverted cone, a flow region being defined between the deflector and lower periphery of the lower inverted cone.