Abstract: An underdrain assembly in a wastewater filtration unit for providing even distribution of liquid and gas during filter backwashing operations and the uniform collection of filtered water during the normal operation of the filtration unit is provided. The underdrain assembly is provided with a flat, concrete plate with a perimeter matching the shape of the filtration unit. The concrete plate has a plurality of holes with individual PEX tubes in each hole extending from the concrete plate top surface through and protruding below the plate.

Abstract: The device described in the present invention can trap plugging particles contained in the liquid feed supplying a reactor functioning in gas and liquid co-current down-flow mode using a specific distributor tray comprising a filtration medium. The present device is of particular application to the selective hydrogenation of feeds containing acetylenic and dienic compounds.

Abstract: A stormwater filter assembly includes a hood and an outlet tube within the hood for draining filtered stormwater. The outlet tube has a solid wall along at least a portion of its height, and an inlet above the solid wall. A second tube is disposed about the outlet tube defining a flow space therebetween for receiving filtered stormwater. The second tube includes a wall that is perforated along at least a portion of its height that overlaps with the solid wall of the outlet tube such that filtered stormwater that enters the flow space must move upward to enter the outlet tube. A filter media is disposed between the hood and the second tube through which stormwater travels during a filtering operation.

Abstract: A distributor for use on a dip tube in the particulate bed of a water conditioner includes a sleeve mounted on the dip tube, a plurality of resilient vanes extending radially outwardly from the sleeve, thin membranes on the vanes, and holes in the membranes, whereby water flowing through the bed is evenly distributed throughout the bed and the bed is agitated by up and down flexing of the distributor in the bed.

Abstract: The present invention provides an upward-flow manganese contact column for feeding raw water to a manganese catalyst-packed layer through a plurality of dispersion nozzles provided at the upper surface of a chamber by forming the chamber for allowing raw water to flow in at the bottom of a column body into which a granular manganese catalyst is packed. Each dispersion nozzle has an umbrella portion above a perpendicular nozzle body, and the umbrella portion is configured so that the lower end of the umbrella portion is elongated below the upper end of the nozzle body. Raw water is supplied to the entire manganese catalyst-packed layer from the lower end of the umbrella portion of each dispersion nozzle. It is capable, of exhibiting stable treatment ability for a long time by suppressing particles of the manganese catalyst from being worn by collisions of the particles.

Abstract: The present invention provides an upward-flow manganese contact column for feeding raw water to a manganese catalyst-packed layer 3 through a plurality of dispersion nozzles 8 provided at the upper surface of a chamber 2 by forming the chamber 2 for allowing raw water to flow in at the bottom of a column body 1 into which a granular manganese catalyst is packed. Each dispersion nozzle 8 has an umbrella portion 12 above a perpendicular nozzle body 9, and the umbrella portion 12 is configured so that the lower end of the umbrella portion 12 is elongated below the upper end of the nozzle body 9. Raw water is supplied to the entire manganese catalyst-packed layer from the lower end of the umbrella portion 12 of each dispersion nozzle 8. It is capable of exhibiting stable treatment ability for a long time by suppressing particles of the manganese catalyst from being worn by collisions of the particles.

Abstract: A filtration system that includes a plurality of underdrain blocks arranged to define a plurality of laterals. Each underdrain block defines an interior and an exterior and has an orifice that provides fluid communication between the exterior and the interior. The system also includes a plurality of media retaining plates. Each plate includes a plurality of slots that extend through the plate. Each slot has an average width of less than 0.065 inches. Each plate connects to only one of the plurality of underdrain blocks such that the slots provide fluid communication between the exterior and the orifice of the underdrain block to which the plate is attached.

Abstract: The invention recites a filtration tank including a chamber for holding liquid to be filtered, the filtration tank includes a fluid inlet for providing liquid to the chamber. The filtration tank further includes a fluid outlet and at least one filter block disposed between the inlet and the outlet, wherein the at least one filter block includes a porous cap having an average pore size of up to about 250 microns.

Abstract: A filter system employing a modular filter and at least one high rate pre-treatment system for expeditiously and effectively filtering water. The modular filter includes a reservoir housing for containing fluid. A plurality of filter cells are disposed in the reservoir housing for filtering influent passed through the reservoir housing. Each of the plurality of filter cells has at least one layer of media. A moveable backwash assembly is provided for sequentially backwashing the plurality of filter cells. The backwashing procedure is performed on the modular filter system such that while one of the plurality of cells is being backwashed the remaining cells are filtering pre-treated influent processed by the pre-treatment system. The pre-treatment system preferably has a footprint considerably smaller than the footprint of the modular filter.

Abstract: The invention recites a filtration system including a block including a first wall and a second wall substantially parallel to the first wall. A top surface that is substantially perpendicular to the first wall is disposed between, and coupled to, the first and second walls to at least partially define an inner chamber. The top surface further includes an orifice defining a passageway between a block exterior and the inner chamber. A plate including a plurality of slots, each slot having a width of less than about 0.065 inches, and a slot outlet, is coupled to the top surface of the block. The slot outlets in the plate are substantially coplanar and the plate, when coupled to the block, substantially covers the orifice.

Abstract: A modular filter system and a method of repairing and/or replacing one or more components thereof. The modular filter system includes a traveling backwash hood assembly and a plurality of filter cells having media contained therein. The traveling backwash hood assembly includes a hood and a baffle assembly. Preferably, the hood has at least one opening formed therein and a cover plate operably associated with the at least one opening. The baffle assembly includes a plurality of baffles for directing the flow of fluid. The baffle assembly is detachably connected to the hood to permit the baffle assembly to be moved relative to the hood to permit an individual to readily gain access to the baffle assembly to repair or replace one or more components thereof.

Abstract: The present invention relates to the raw water-filtering technical field, and is to provide a high speed filtering apparatus which can filter a great amount of raw water containing suspended substances (SS) at a high concentration at a high speed. Floating filter media 2, which are composed of a foamed polymer having an apparent density of 0.1 to 0.4 g/cm3 and a 50% compression hardness of not less than 0.1 MPa and have uneven shapes or cylindrical shapes with sizes of 4 to 10 mm, are charged into an up-flow type filtering tower 1. The raw water containing SS at a high concentration is filtered by passing it through the filtering tower 1 at a linear water-passing speed of 100 to 1000 m/day. While the floating filter media 2 are not compacted, a high SS-capturing percentage can be obtained. Back washing can be also effected at a high linear washing speed of 1.2 to 4.0 m/min.

Abstract: A method and product for removing at MTBE molecules from a solution, such as a contaminated aquifer, includes exposing the solution to a plurality of molecularly imprinted polymer beads (MIPS) that have receptor sites on the surfaces thereof that include imprints that match the physical shape of at least a portion of an MTBE molecule. A quantity of the MTBE molecules align with and adhere to some of the receptor sites and, accordingly, they are removed from the solution producing a remediated solution. According to one embodiment, the MIPS are contained in an enclosure having a plurality of openings large enough to permit the solution to pass through and small enough so as to prevent the MIPS from passing through. According to a preferred embodiment the MIPS are applied (i.e., coated) to the inside surface of a conduit and the solution is forced or allowed to flow through the conduit thereby removing some of the MTBE molecules therefrom.

Abstract: An apparatus for retrofitting a water filtration underdrain and a method therefor are provided. The apparatus comprises a nozzle for uniform water distribution through the filtration media, a conduit to provide fluid flow communication between the nozzle and an opening in the underdrain, and a filler substance configured to fill depressions of the type generally found in Bell bottom and Wheeler underdrain systems. Alternatively, the apparatus may comprise a nozzle and a pre-molded insert formed to mate with the depression including a channel to provide fluid flow communication between the nozzle and an opening in the underdrain. Methods for retrofitting a water filtration underdrain system using such devices are also provided.

Abstract: A lid for an underdrain block that has a top surface defining an opening for receiving fill material. The top surface forms a ridge circumscribing the opening, the lid comprising a top, a bottom and a peripheral edge, the peripheral edge comprising a rim adapted to interlock with the ridge. The ridge of the underdrain block can have a flange perpendicular to the top surface and the rim on the lid is adapted to tightly fit over the flange so that the rim interlocks with the flange. Alternatively, the underdrain block for a filter system comprises a hollow plastic housing comprising a top wall that defines an opening for receiving the fill material. The top wall forms a ridge surrounding the opening and the lid seals the opening in the top wall. The lid comprises a peripheral edge that forms a u-shaped rim. The u-shaped rim has a locking means to tightly fit over the ridge so that the rim interlocks with the ridge so as to seal the opening.

Abstract: In a filtration system wherein wastewater is recirculated back through a filtration bed for a second pass therethrough, the recirculated wastewater being directed through a set of secondary distribution pipes located in the filtration bed below those distribution pipes through which the wastewater is first carried through the bed, with hood elements arched over the respective secondary pipes.

Abstract: A pipe-mounted dual velocity strainer is disclosed including a bottom strainer portion to provide a first velocity flow path in one direction and a top strainer portion to provide a second velocity flow path in the opposite direction. A check valve and coaxial conduit between the two strainer portions provide means for obtaining different velocities dependent upon the direction of flow. The invention is utilized in fluid distribution and collection for ion exchange and filtration systems.

Abstract: In a travelling bridge filtration system including a tank divided into a plurality of adjacent filter cells, each of the cells containing filter media, a travelling bridge carriage located above the tank and movable along the tank, the carriage supporting a backwash hood engageable with each of the filter cells, the improvement comprising a liquid backwash pump for causing backwash liquid to flow through the cell in a first backwash direction counter to a second filtration direction, and for causing backwash air to be drawn into the cell and to flow in the first direction with the backwash liquid.

Abstract: A module is disclosed for use as a membrane device, comprising, a shell with fluid couplings removably affixed to each of its ends and at least one non-disassemblable cartridge operably held within the shell. The cartridge is constructed from plural wafers sequentially coaxially aligned, each wafer consisting essentially of a generally planar frame and an array of hollow fibers of selectively permeable material adhesively held by their ends in opposed portions of the border of the frame, without initially potting the ends. Each frame has a central through-passage, and multiple frames together define an axial through passage in each cartridge through which a feedstream is typically flowed in "outside-in" flow. Each opposed portion of border is provided with longitudinal, laterally spaced apart grooves in its upper surface and the fibers trained in the grooves, and successive wafers are bonded together. The bores of the fibers are in open fluid communication with the permeate zone in the shell.

Abstract: A liquid filtration system is provided which includes a traveling bridge carriage mounting air scour and backwash means within a single hood structure for successively cleaning each of a plurality of roughing filter cells and polishing filter cells formed in a filtration tank. The air scour means includes an air scour inlet conduit for supplying air under pressure to each cell. The backwash means includes a backwash conduit for creating suction within each filter cell. The single hood structure is adapted to sealingly engage each of the roughing and polishing filter cells. For the roughing filter cells, only an air scour operation is carried out while, for the polishing filters, backwash is done.

Abstract: A liquid filtration system is provided which includes a traveling bridge device mounting and backwash means for successively cleaning each of a plurality of filter cells formed in a filtration tank. Both surface wash and backwash means are included in a single hood structure adapted to sealingly engage each filter cell, successively, as the traveling bridge carriage traverses the tank. The surface wash means includes a surface wash conduit for supplying liquid under pressure to the upper surface layer of each cell. The backwash means includes a backwash conduit for creating suction within each filter cell.

Abstract: A filtration column having a bottom with reciprocally arranged peaks and troughs. Branched pipes with uniformly distributed small holes on their lower portions and surrounded by screens or wedge pipes lie in the troughs. The branched pipes lead to gathering pipes, which in turn lead to an outlet.

Abstract: A submerged filter includes filtering matter in the form of a granular material contained in a vat having a floor for supporting the granular material. The liquid to be treated flows from the bottom to top and is brought into contact with a gas serving for the treatment of the liquid and circulating in the same direction. The filtering material is washed with water and air. The liquid to be treated, the treating gas, and the wash fluids are introduced into the filtering mass through the floor by means of nozzles which extend through the floor. Some of the nozzles essentially serve for introducing the treating gas, while others serve for introducing the liquid to be treated and the fluids for washing the filtering material.

Abstract: Modules for use in forming rigid filter beds by laying a plurality of the modules side-by-side upon a flat base are in the form of porous, planar elements having a continuous, polygonal upper surface, a continuous lower surface approximately coterminous to the upper surface, and sides normal to said surfaces of substantially equal depth much shorter than their length, such elements comprising laminated layers, each layer being formed of particulate material of substantially uniform size rigidly fixed together in a matrix of cured binder, the particles of the layers being substantially different in size than the particles of the adjacent layers, the top surface being flat and the bottom surface being channelled. In preferred forms, the modules' surfaces are square, there are only a top layer and a bottom layer, the top layer is much thinner than the bottom layer and the particles in the top layer are appreciably smaller than the bottom layer particles.

Abstract: In a modular water filtration and companion backwash assemblage, a reservoir is sectioned into an upper, supply chamber and a lower, drain chamber by a plurality of modular, horizontally co-planar filter cells. A carriage assembly is selectively positioned over an individual cell and a depending backwash hood is lowered to isolate, hydraulically, the modular cell. Water is pumped upwardly, out of the hood, expanding and scrubbing the filter media. Jetwash probes intensify the cleansing action, and a baffle plate having displacement accelerators ensures equal but swift upward displacement of backwash waters. Each cell is sequentially backwashed on a continuous basis, allowing uninterrupted operation of the other filtration modules.

Abstract: A filter apparatus in which a generally horizontal bed of filter material is supported on a porous support and is divided by spaced partitions into individual filter cells above the support and individual filter compartments below the support, and a carriage is mounted for movement along the filter bed and has a collector hood that moves along the top of the bed to collect backwash effluent therefrom and a backwash head arranged to direct backwash fluid into the compartments below the porous support. A pair of spaced scarifier blades are provided in the collector hood to scarify the upper surfaces of the filter bed. The backwash head is advantageously in the form of a jet pump arranged to entrain water from filtrate launder that communicates with the filtrate compartments.

Abstract: An axially rigid, tubular grid is fitted over a conduit having a single longitudinal row of apertures; a fine mesh flexible tube is fitted over the grid; an end cap closes one end of the conduit and seals the tube thereto; and a tubular connection is threaded onto the other end of the conduit to seal the adjacent portion of the flexible tube to the conduit.

Abstract: The present invention relates to a filter provided with a filter bed consisting of a granular material, which does not comprise layers of coarser material. In the filter bed at least one liquid distributor is arranged which defines an expansion space otherwise defined by areas of repose for the bed material, in which space at least one outflow opens above the areas of repose. The distributor is so designed, that the liquid can flow out of the openings with great energy and fill the cavity and fluidize the whole bed, which enables homogenous rinsing of the bed. The opening of the distributor is larger than the mean grain size of the filter bed material and allows fiber, pieces of plastic and similar impurities to pass through the distributor and be removed from the filter.