Abstract: A last chance screen for a fuel system includes a mesh that includes a first plurality of members extending in a first direction and a second plurality of members extending in a second direction and intersecting the first members. Openings are formed in the mesh between the first plurality of members and the second plurality of members. The first plurality of members and the second plurality of members have an airfoil shaped cross-section.

Abstract: Apparatus for filtering used cooking oil includes a container, an inner cup, and a filter pad. The apparatus can be configured to remove undesirable impurities from liquid. For example, the apparatus can be configured to remove total polar molecules and lovibond color red from used cooking oil.

Abstract: A flow rate regulator (1) having a regulator housing (2), wherein said regulator housing (2) has an outer circumferential edge region (5) that can be placed on an end circumferential edge region (3) of a jet regulator (6) and/or of a sieve (11) and including a central annular gap (12), in which an annular throttle body (13) made of elastic material is present, bounding a control gap (15) between same and an inner and/or outer circumferential wall (14) of the annular gap (12) having a control profile, wherein the open flow-through cross-section of said control gap is changeable under the pressure of the flowing water.

Abstract: A liquid filtration system, including an inclined filter support and a chimney, the chimney having an entrance adjacent an upper portion of the filter support; and a sheet filter supported in an inclined orientation by the inclined filter support. Air trapped by the sheet filter during use of the filtration system travels along a path corresponding to the inclined orientation sheet filter and into the entrance of the chimney for escape.

Abstract: Water filtration apparatus with compostable filters are disclosed herein. A water filtration apparatus in accordance with one embodiment of the disclosure includes a fluid containment vessel having a conically shaped upper chamber and a conically shaped lower chamber. A filter assembly is seated within the upper chamber and carries a compostable filter device that fits within a filter cavity of the filter assembly.

Abstract: Disclosed herein are apparatus and methods for filtering a fluid including a filter module assembly coupled to a manifold. The manifold may include a manifold inlet in fluid communication with a source of feed liquid, an outlet in fluid communication with header of the filter module assembly, a fluid passageway in fluid communication with the manifold inlet, a source of gas, and the outlet, a second fluid passageway in fluid communication with the header and the first fluid passageway and a second manifold outlet vertically displaced from the first manifold outlet and in fluid communication between the first fluid passageway and the second fluid passageway.

Abstract: A method and apparatus for separating liquid from food product includes a rotable drum mounted in a frame. The ends of the drum are comprised of rigid structural material, and each includes a sealing band. An inlet at the first end receives food product and liquid. Food product solids, with less water than received, are discharged from an outlet at the second end. One or more helical flights extend between the ends. The flights have an outer edge, and a flexible mesh screen is wrapped about and intermittently supported by the outer edge. The ends of the screen are held in the sealing bands, and the longitudinal edges of the screen are held by a seal extending between the sealing bands. Liquid can pass through the screen and food product is retained in the drum by the screen, and moved to the outlet by the flights.

Abstract: In an inside-out flow filter, a transition pressure recovery member is provided at the inlet and has structured contoured guide surfaces guiding fluid flow therealong into the hollow interior of an annular filter element to minimize transition pressure loss from the inlet to the hollow interior. The transition pressure recovery member includes transition flow deceleration surfaces gradually decelerating flow of fluid into the hollow interior and minimizing pressure drop.

Abstract: A chromatography column distribution system (101) comprises a set of first bed support ribs (107) extending radially from a inner, first radial position (R1) near the centre of the plate to a outer radial position nearer to the periphery (109) of the plate and at least one set of intermediate bed support ribs (117, 119) starting at an intermediate radial position (R2, R3) and extending to an outer radial position nearer to the periphery (109) of the plate (101), whereby channels are formed between adjacent bed support ribs (107, 117, 119).

Abstract: A kammprofile gasket is provided. The kammprofile gasket forms a flow aperture into which an object, such as a strainer or orifice plate, may be machined into the gasket to provide additional functionality. The gasket has a core material with a sealing material overlaying a portion of the core material such that a seal is formed between opposing flanged surfaces. The core material may be machined such that a base plate for an orifice or a plurality of support beams extend into the flow aperture. The plurality of support beams may provide support for a filter or strainer coupled upstream to the core material. The base plate may provide an inclined surface, such as a cone, to an orifice where the cone functions to direct excess flow away from the orifice to self flush.

Abstract: The present disclosure describes an axial bypass sleeve for use with a spiral wound membrane element. The axial bypass sleeve has a protrusion and an opening that defines a flow path to provide fluid flow communication through the axial bypass sleeve. In use, the axial bypass sleeve is wrapped around a spiral wound membrane element and both are placed in a pressure housing. A pressurized feedstock is introduced into the pressure housing. A portion of the pressurized feedstock flows through the spiral wound membrane element to produce a permeate stream and a retentate stream. A portion of the pressurized feed stock flows around the spiral wound membrane element, called bypass flow. The protrusion extends into the annular space to restrict the bypass flow. A portion of the bypass flow passes through the opening and enters into the spiral wound membrane element to increase permeate production.

Abstract: An oil filter interposed in an oil passage and configured to perform filtering of oil by causing the oil to pass through a passage hole of a filter body formed by etching, wherein an oil passing section is etched to a half of plate thickness of the filter body on one surface of the filter body, and a plurality of the passage holes are formed by etching in a region where the oil passing section is formed on the other surface of the filter body.

Abstract: A dialyzer composed of: first and second dialyzation chambers, and an intermediate chamber interposed between the first and second dialyzation chambers. Each dialyzation chamber has opposed first and second ends and contains a filter member that separates the chamber into a blood compartment and a dialysate compartment. Each of the compartments extends between first and second ends. Each of the chambers has a respective one of a blood inlet or outlet and a dialysate inlet or outlet arranged so that blood and dialysate flow in counter-current to one another in both chambers. The intermediate chamber is connected to form a dialysate-free blood flow passage between the blood compartments.

Abstract: A mass transfer system including a housing and a three-dimensional ordered open-cellular micro-truss material within the housing for a mass transfer application. Here, the three-dimensional ordered open-cellular micro-truss material includes a plurality of first truss elements defined by a plurality of first self-propagating polymer waveguides and extending along a first direction, a plurality of second truss elements defined by a plurality of second self-propagating polymer waveguides and extending along a second direction, and a plurality of third truss elements defined by a plurality of third self-propagating polymer waveguides and extending along a third direction. The first, second, and third ordered truss elements interpenetrate each other at a plurality of nodes to form a continuous material. In one embodiment, the continuous material is a metal material.

Abstract: A filtering unit is provided which may include a filter cap, a filter basin, a filter or membrane within the filter basin and an enclosed fluid intake channel, which may dispense fluid into the filter basin. The enclosed fluid intake channel may be coupled to the inlet port of the filtering unit and may slope in a downward manner to the bottom of the filter basin. The intake channel may have an open end at the bottom of the filter basin. The open end may be substantially parallel with the filter basin bottom and may dispense fluid into the filter basin. The fluid may flow from the intake channel and into the filter basin in a laminar manner. The fluid may fill the filter basin and flow from the filtering unit through an outlet port of the filtering unit.

Abstract: A system for dewatering a stream of slurry has a first and a second separator. The first separator removes objects above a first size, to produce a stream of primary treated slurry. The second separator removes objects above a second size from the primary treated stream, the second size being smaller than the first size. Optionally, a third separator removes objects above a yet smaller third size from the stream of secondary treated slurry. The first separator has a plurality of sieve mat supports alternately connected to a main support frame section and a movable support frame section so that the flexible sieve mat can be agitated by the movable support frame section, a collector being provided for collecting the primary treated slurry passing through the flexible sieve mat. In an optional step, water contained in the separated solids is removed.

Abstract: Provided are filtration devices for purifying fluids from bioprocess applications and processes for using the same. The fluid filter elements or cells and fluid filter assemblies or capsules minimize upstream and residual volumes by the use of substantially flat interior surfaces. Desired pressure ratings are also met without the use of external equipment. Such capsules and assemblies can be disposable. The cells and capsules are in particular suitable for intermediate filtration volumes (150-2500 cm2 effective filtration area (EFA)) of biopharmaceutical processes. One or more of the following features are also provided by these cells and capsules: ergonomic connections, stand alone device with desired pressure rating, offer a small footprint when running in series or parallel, ability to monitor fluid level during operation, provide various EFA sizes to allow for use with minimal fluid volumes, and offer an integral seal between clean and dirty process fluid streams.

Abstract: In a separation membrane module in a module main body, an upper horizontal partition plate forms an upper fluid channel, a lower horizontal partition plate forms a lower fluid channel, a plurality of vertical outer tubes are fixed between the upper horizontal partition plate and the lower horizontal partition plate, and vertical tubular membrane elements extend through the respective outer tubes with a gap. An upper end of the gap is in communication with the upper fluid channel and a lower end of the gap is in communication with the lower fluid channel. An upper end opening of each of the membrane elements is open to outside of the module main body and a lower end opening each of the membrane elements is closed. A vertical partition plate is provided in either the upper fluid channel or the lower fluid channel to form an inlet chamber and an outlet chamber.

Abstract: Faucet diverter valves for use, for example, with faucets and water filtration systems.

Abstract: In a reverse osmosis desalination plant a number of membranes (34, 36, 38, 40) are arranged end-to-end in a cylindrical outer casing (42). Each membrane comprises a sleeve, a permeate pipe (56) passing centrally through the sleeve, a plurality of leaves of permeable material (54) wound around the pipe and contained within the sleeve and an apertured plate (10, 58) at each end of the sleeve. According to the invention the flow distributor plate (10) at the inlet end of each membrane is a flow distributor and has a plurality of bores (30.1, 30.2 etc) through it from a front face (12) to a rear face (14). The front face (12) has a recessed area (20) which is set back from the remainder (22) of the front face (12). The entrances to at least some of the bores (30.1, 30.2 etc) are within the recessed area (20).

Abstract: An enhanced process for semipermeable membrane performance. Counter flowing chambers on either side of a semipermeable membrane is disclosed. Each comprise turbulent flow injectors and flow deflector cells giving rise to swirling and turbulent boundary layer conditions. The disclosed invention obviates concentration polarization in osmotic systems and maximizes flux (fluid flow) through the semipermeable membrane. This invention fills a need in large volume, forward osmosis water purification systems.

Abstract: A fluid filter system including a filter housing having an inlet chamber that surrounds the inner chamber that houses the filter cartridges. The filter cartridges are positioned in an involute configuration to channel rotationally inward flow of the fluid as it loses kinetic energy and velocity. The configuration provides superior filtering of fluids flowing therethrough and provides superior filter life.

Abstract: A system for dewatering a stream of slurry has a first and a second separator. The first separator removes objects above a first size, to produce a stream of primary treated slurry. The second separator removes objects above a second size from the primary treated stream, the second size being smaller than the first size. Optionally, a third separator removes objects above a yet smaller third size from the stream of secondary treated slurry. The first separator has a plurality of sieve mat supports alternately connected to a main support frame section and a movable support frame section so that the flexible sieve mat can be agitated by the movable support frame section, a collector being provided for collecting the primary treated slurry passing through the flexible sieve mat. In an optional step, water contained in the separated solids is removed.

Abstract: A liquid filter assembly comprising a filter subassembly is inserted within an elongated tubular filter body, enclosed by a pair of end caps. The filter subassembly includes a plurality of filtration discs placed onto a tubular core and inner support member. A disc aperture is provided concentrically through each filtration disc. An outer filter support member and a central filter support member support each filtration disc. The outer filter support member engages with an interior of the elongated body and an end wall engages with the disc perimeter. The central filter support member engages with an exterior of the inner support member and an end wall engages with the peripheral edge about the filtration disc aperture. Fluid passes through the first end cap orifice, continuing through the inner support member, transferring flow through the filtration discs, returning through the inner support member, and exiting the opposite end cap orifice.

Abstract: A system and method for uniformly distributing fluids (e.g., washing and in-service) through a filter bed of a filter. The system and method of the present invention can be used with any type of filter that uses media to remove impurities from a fluid. The filter bed can include one or more layers of media. The media can be natural (e.g., sand, gravel, anthracite, etc.) or can be fabricated (e.g., plastic). The filter media can be supported by one or more layers of gravel. Alternatively, the filter media can be supported by a porous plate or other support designed to replace the gravel layers. The present invention includes a system having one or more distribution members configured to uniformly distribute a fluid through a filter bed of a filter. Preferably, the one or more distribution members can be readily installed by relatively unskilled labor in both existing filters and new filters.

Abstract: A filter assembly for a fuel delivery system for actuators and fuel control system of an aircraft engine includes a wash flow filter. Fuel flow velocity is increased through the filter through use of a recirculating passage that is effectively achieved through use of an ejector pump. A portion of the pressurized fuel delivered by the main fuel pump is diverted and serves as a motive fluid that scavenges unfiltered flow from downstream of the filter and recirculates or discharges the recirculated flow to an inlet of the filter. This provides increased velocity to maintain sufficient washing of the filter openings.

Abstract: The present invention discloses a method and apparatus for separating particles and dissolved matter from a fluid stream. Specifically, the present invention includes a first pressure source which transports untreated fluid into a separator annulus with a filter element disposed therein. The untreated fluid is placed under appropriate pressure sufficient to produce turbulent flow, increased particle kinetics and/or cavitation physics allowing the desired fluid to penetrate and pass into and through the filter media. The filtered fluid is then transported to a collection tank. The contaminant particulate matter retained on the exterior of the filter media may be removed by the instantaneous reverse pressurization of the separator annulus by a second pressure source thereby removing the contaminant particles away from contact with the filter media, and which may then be transported to a waste collection tank or a concentrator for further treatment.

Abstract: An RF inductor such as a Tesla antenna splices nanotube ends together to form a nanostructure in a polymer foam matrix. High Internal Phase Emulsion (HIPE) is gently sheared and stretched in a reactor comprising opposed coaxial counter-rotating impellers, which parallel-align polymer chains and also carbon nanotubes mixed with the oil phase. Stretching and forced convection prevent the auto-acceleration effect. Batch and continuous processes are disclosed. In the batch process, a fractal radial array of coherent vortices in the HIPE is preserved when the HIPE polymerizes, and helical nanostructures around these vortices are spliced by microhammering into longer helices. A disk radial filter produced by the batch process has improved radial flux from edge to center due to its area-preserving radial vascular network. In the continuous process, strips of HIPE are pulled from the periphery of the reactor continuously and post-treated by an RF inductor to produce cured conductive foam.

Abstract: The present invention provides a bottom nozzle filtering device and a debris-preventive bottom nozzle that can be used for a light water reactor (LWR) nuclear fuel assembly. The bottom nozzle filtering device includes a plurality of successively spliced unit plates; a through flow channel is formed between the spliced adjacent unit plates; the flow channel includes a plurality of spaced straight-section flow inlets and straight-section flow outlets, and a flow subchannel communicating; the outlet section of each straight-section flow inlet in the middle splits respectively into two flow subchannels, and the inlet section of each straight-section flow outlet in the middle communicates respectively with the two flow subchannels. The flow direction of the coolant is controlled by the straight-section flow inlet, the straight-section flow outlet, the flow subchannel to prevent unnecessary eddies forming, making the pressure loss effectively controlled and improving the filtering effect.

Abstract: A system and method for capturing ecologically harmful substances in the nature of hydrocarbons from the surface of a body of water or from the ground adjacent a landfill or waste dump or from a shoreline of a body of water into which residual waste fluids from an adjacent ground leakage is passed. The system and method including a plurality of modular traps. The traps having a side, end, top and bottom panels constructed of a material that allows fluid flow therethrough.

Abstract: An endcap includes a first plate member having a radial inner portion, a radial outer portion, and defining a longitudinal axis. The endcap also includes a flange disposed between the radial inner and outer portions, and projecting axially along the longitudinal axis in a first direction. The endcap also includes a first seal member disposed adjacent the flange. The first seal member includes a first portion engaged with an axial facing surface of the first plate member and a second portion engaged with a radially facing surface of the flange. The endcap further includes a second plate member disposed radially outward of the radial outer portion and a second seal member disposed adjacent the second plate member including at least a portion axially spaced from the axially facing surface of the first plate member in a second direction along the longitudinal axis opposite the first direction.

Abstract: One exemplary embodiment can be a process for removing one or more sulfur-containing hydrocarbons. The process can include sending a stream including one or more alkaline compounds, one or more hydrocarbons, and one or more sulfur compounds to a stack of a disulfide separator, and sending a fluid downstream of a distributor to a vortex contacting device for providing a gas having no more than about 100 ppm, by weight, sulfur. Often, the stack includes one or more walls surrounding a void and the distributor positioned within the void, and is adapted to receive the stream having one or more phases.

Abstract: An upper endcap of a fuel filter cartridge includes a skirt, an axially extending pin surrounded by the skirt, and a plurality of ribs that define fluid flow channels leading to the pin. The pin is extendable through an axially facing fuel inlet opening at the upper end of a standpipe for actuating a valve to an open position allowing fuel to flow through the axially facing inlet opening and into the standpipe. The valve can include a hole that receives the pin therein to help stabilize the valve when the valve is actuated open.

Abstract: The present invention provides a coolant demineralizer for a fuel cell vehicle, which removes ions, released from a pipe, from coolant of a fuel cell stack. In preferred embodiments, the present invention provides a coolant demineralizer suitably configured to reduce the occurrence of differential pressure due to an ion resin layer such that coolant can smoothly flow through a filter member, thereby increasing the effect of filtering ions and improving the efficiency of use of ion resin.

Abstract: The present invention relates to a water filter, having a filter head and an interchangeable filter cartridge, with a blend-adjusting element which is located on the filter cartridge. The water filter is distinguished in that during the operation of installing the interchangeable filter cartridge in the filter head, the blend-adjusting element is positioned together with the filter cartridge on the filter head via adjustable or fixed drivers. In a further embodiment, the water filter is distinguished in that an adjusting device comprises an untreated-water distribution element arranged in or on the filter head and a partial-flow channel guiding element which is complementary with respect thereto and is arranged in or on the filter cartridge.

Abstract: The present disclosure is directed to a capsule configured to direct fuel flow within a fuel filter assembly housing. The capsule has a tubular element configured to define a flow path between the capsule and a fuel filter assembly housing. The tubular element defines an interior chamber, a proximal end, and a distal end defining a manifold. The tubular element is configured to be removably received by the fuel filter assembly housing. The interior chamber is configured to receive a fuel filter element. The capsule is configured to direct fuel flow from the proximal end of the capsule, around the tubular element, to a point beyond the distal end of the capsule, and to receive fuel flow from the point beyond the distal end of the capsule and direct the fuel flow via the manifold to the filter element, thereby providing at least two passes of the fuel flow through filter elements within the fuel filter assembly housing.

Abstract: A scavenging filter includes a volume containing activated beads or fiber particles of a scavenging material housed in a removable housing in a cartridge filter body having an axial inlet extending to a space below a permeable false bottom, the fluid permeating upwards through the material, and cleaned liquor leaving via an annular space surrounding the chamber.

Abstract: The present disclosure describes a brine seal for use with a spiral wound membrane element. The brine seal has an elongate body with a flexible wing. The brine seal is wrapped around the spiral membrane element with a space between each turn of the brine seal. The wrapped spiral wound membrane unit is placed inside a pressure housing. Between the wrapped spiral wound membrane element and an inner surface of the pressure housing is an annular space. The brine seal, the spiral wound membrane element and the pressure housing establish a bypass flow channel that spirals around the spiral wound membrane element, through the annular space. Feedstock can enter the bypass flow channel to provide sanitary flushing of the annular space. Some of the feedstock in the bypass flow channel enters the spiral wound membrane to improve the efficiency of the spiral wound membrane element.

Abstract: A filter assembly with a replaceable filter element and a reusable filter housing, which incorporates a locking mechanism to ensure that the filter system will not be operated without a filter element installed.

Abstract: An endcap including a first plate member including a radial inner portion, a radial outer portion, and defining a longitudinal axis. The endcap also includes a flange disposed between the radial inner and outer portions of the first plate member and projecting axially along the longitudinal axis in a first direction. The endcap also includes a first seal member disposed adjacent the flange. The first seal includes a first portion thereof engaged with an axial facing surface of the first plate member and a second portion thereof engaged with a radially facing surface of the flange. The endcap further includes a second plate member disposed radially outward of the radial outer portion and a second seal member disposed adjacent the second plate member including at least a portion thereof axially spaced from the axially facing surface of the first plate member in a second direction along the longitudinal axis opposite the first direction.

Abstract: The invention relates to a filtering device, comprising a tubular filter element and a carrier part, with the filter element fastened thereon. The carrier part can be inserted between an unfiltered fluid pipe and a filtered fluid pipe. The pipes can be assembled into a continuous flow pipe, wherein the filter element protrudes into the pipe interior.

Abstract: An apparatus for diverting rainwater includes a body having a top portion, a bottom portion, and a central portion. A diverter is disposed within the central portion, and has a lower portion and an upper portion. The lower portion of the diverter, together with one or more walls of the body, defines a containment configured to capture rainwater that enters through the top portion. An opening in at least one of the walls of the body is configured to divert rainwater from the containment. The body also includes a bypass flow area extending through the central portion adjacent to, and separate from, the containment, where the bypass flow area has a cross-sectional area that is substantially equal to or greater than a cross sectional area of the top and bottom portions.

Abstract: The invention relates to a fuel filter (1) with a device for separating water from the fuel. This device comprises at least one filter screen element (6) placed in a filter housing (2) which is located downstream a filter element (3) for the filtration of particles from the fuel, a tank (15) located under the filter screen element (6) at the filter housing (2) in which the separated water droplets are collected, and a device for deviating the fuel between the filter element (3) and the filter screen element (6).

Abstract: The present disclosure relates to a diffusion and/or filtration device, such as a dialyzer, hemofilter, or ultra-filter, having improved flow characteristics. The invention also relates to an end cap for the device.

Abstract: A channel groove pattern 38 allowing the passage of a permeated liquid having passed through a filtration membrane 37 is provided on one filtration plate surface of a filtration plate 36, and a permeated liquid outlet nozzle 39 is provided on the filtration plate 36. The channel groove pattern 38 includes multiple channel grooves 38a, and a header groove 44 for averaging suction pressures is formed on the filtration plate 36. An area where the channel groove pattern 38 is formed is divided into upper and lower water collection areas 46 and 47 by the header groove 44. The permeated liquid outlet nozzle 39 and the header groove 44 communicate with each other through the channel grooves 38a of the water collection area 46, and the channel cross-sectional area of the header groove 44 is larger than that of the channel groove 38a.

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: A filter cartridge, which is suitable in particular for purifying dental waste waters, has a housing with three different spatial regions which receive three different filter materials having different filter properties. The first filter material is preceded by a sedimentation space.

Abstract: The present invention relates to a spiral wound reverse osmosis membrane element comprising at least one set of the water purification membrane module comprising a laminated mesh-like treated water flow guiding member, a reverse osmosis membrane and a mesh-like feed water flow guiding member wound around a central treated water pipe; the reverse osmosis membrane is folded at a folded side to form a feed water flow channel therein along its inner surface and closed and sealed at areas remote from the central treated water tube at two sides adjacent to the folded side; a treated water flow channel is formed between outer surfaces of adjacent reverse osmosis membranes and opened only at a treated water outlet which opens towards the central treated water tube and is closed and sealed at remaining three sides; the mesh-like treated water flow guiding member is disposed inside the feed water flow channel.

Abstract: Multiple water purifier modules are stacked in a rack having manifolds for each of the various water filtration functions: feed, concentrate, and filtrate. Each module connects to the rack by a quick connect for each of the filtration tubes. The quick connects are of the self-sealing type. A handle on the end of the module away from the rack has a lever for causing the quick connects to release the module from the rack while the system remains in operation. The, module can then be totally removed from the rack for testing, service, or replacement while the overall system remains in operation. Each module contains complete filtration media. The water is passed into the feed tubes under pressure where it passes into an elongated cavity filled with elongated hollow fibers. Filtrate, such as purer water, passes through the walls of the hollow fibers to an outlet, while concentrate, which is fluid with a high percent of impurities, flows from the cavity into concentrate tubes to another outlet for disposal.

Abstract: This invention provides a hollow fiber membrane module which can reduce pressure loss in discharging water within a module and can reduce operating power. A hollow fiber membrane bundle is disposed within a cylindrical case having in its side face an opening part for the inflow/outflow of water, and the end of the hollow fiber membrane bundle is bonded at an axially outer position with respect to the opening for the inflow/outflow of water. A distribution holes is provided axially inward of the opening for the inflow/outflow of water and so as to surround the outer periphery of the hollow fiber membrane bundle, and grooves and/or corrugated protrusions are provided on the inner face of the distribution cylinder so as to be in communication with each other among the distribution holes.