Abstract: A liquid (2), such as wastewater, is filtered using a liquid-permeable filtering element (9) having first and second faces (10, 11) so as to produce filtered liquid (4) having total suspended solids of no more than 10 mg/L. The method comprises cycling the liquid-permeable filtering element through the liquid whereby, in a first position, an area of the first face of the filtering element is subjected to liquid under pressure and a pressure across the filtering element is greater than 0 and less than or equal to 5.9 kPa (60 cm H2O), and, in a second position, the area is not subjected to liquid under pressure or is subjected to liquid at a lower pressure, and solids accumulated on the first face of the filtering element can be removed by directing at least one jet at the second face of the filtering element through the filtering element towards the first face.

Abstract: A water filter system has a housing with the channel formed adjacent a bottom thereof and at least one chamber formed therein, and at least one filter removably received in the chamber. The channel is adapted to connect with a water inlet line. The channel is also adapted to connect with a water outlet line. The filter is in communication with the channel at a bottom thereof. The filter and an inner wall of the chamber define an annulus therebetween. The filter has an interior passageway that opens to a filter media. The filter media is disposed such that water flows from the channel and into the interior passageway, through the filter media, and into the annulus. The annulus then communicates with the channel.

Abstract: A disc segment adapted to be attached to other disc segments to form a disc assembly, the disc segment being in the form of a frame, the frame comprising a left side rail and a right side rail, and a plurality of spaced apart parallel horizontally extending ribs, each disc side including a corrugated wire mesh supported by the frame ribs, the corrugated wire mesh including crisscrossing wire strands, the strands crossing perpendicularly to each other, and the wire strands extend at an angle of 45 degrees relative to its frame rib.

Abstract: A spin filter plate is disclosed. The spin filter may be mounted in any type of separator/filter system used in irrigation system. The spin filter plate enables to create a cyclonic flow of the fluid, independent of the angle the fluid is supplied to the filter system.

Abstract: An attachment and retaining mechanism is described for removably attaching a rotating filter element to a rotating shaft. The rotating filter element includes a filter media that is driven by a drive mechanism that rotates the rotating shaft. The filter element is removably attached to the rotating shaft such that the filter element and filtration system can be periodically replaced and/or serviced. In some arrangements, the drive shaft includes a D-shaped section that interacts with a mating section of the filter element sleeve of the rotating filter element. In other arrangements, the drive shaft includes at least one flat drive surface.

Abstract: A gas filter includes a housing including a mounting portion and a main portion. The mounting portion is configured to mount the gas filter on a surface of a device. The main portion is configured to be positioned apart from the surface of the device and extends from the mounting portion in a horizontal direction. The housing has an inlet and an outlet and defines a flow channel between the inlet and the outlet. The flow channel has first and second channel portions, the first channel portion extending from the inlet to the second channel portion, the second channel portion extending in a direction substantially parallel to the horizontal direction. A filter member is positioned in the flow channel between the inlet and the outlet.

Abstract: A filtration arrangement for a filtration device having a container. The filtration arrangement includes at least two or more hollow shafts, rotatably mounted in a machine frame, on which a plurality of membrane filter disks are arranged. At least one drive device is allocated to the plurality of hollow shafts. Permeate can be discharged from the container through the hollow shafts. Each hollow shaft can be inserted into the container on one of the ends thereof having the plurality of membrane filter disks, such that the opposite end thereof protrudes out of the container. Several or many of the membrane filter disks are arranged axially spaced apart on each hollow shaft, and deformable spacer sleeves are arranged between one part or all adjacent membrane filter disks and axially space apart the membrane filter disks on the hollow shafts.

Abstract: A filter element of a rotating disc filter including an internal space thereof that is limited by one or more perforated and profiled filter plates and is connected to a vacuum source. Efficiency should herein be increased in that the outside of the filter plates that faces away from the internal space has a plurality of elevations, whose cross section is round or elongated and/or at least one filter plate on the outside facing away from internal space has a plurality of elevations of different shapes and/or sizes.

Abstract: A filter for filtering a flow of liquid a filter assembly with a number of filter disks coaxially arrayed along a central flow path within a pressure vessel. Each filter disk has a number of segments. The segments are preferably implemented as spacers with outward-facing filler screen support configurations supporting first and second filter screens. The filter screen support configurations have a cellular form that is open over a majority of a surface area, An arrangement of support ribs are deployed to maintain a spacing between the first and second filter screen support configurations. At least 80 percent of an internal volume of each of the segments is preferably open to allow liquid flow from the screens to the central flow path. Also disclosed are modular structure's of the filter disks, and a backwash arrangement which performs a spiral scanning motion across the surface of each filter disk.

Abstract: A high velocity cross flow dynamic membrane filtration system includes a disc membrane assembly having a frame and at least two support shafts. Each support shaft defines a longitudinal axis about which is positioned a plurality of axially spaced membrane discs, with each shaft further coupled to the frame. A permeate tube is coupled to each support shaft and in fluid communication with the membrane discs associated with that support shaft. A vessel defines a treatment chamber and is configured to removably support the disc membrane assembly within the treatment chamber. The vessel further includes a wall. The filtration system also includes a drive system. The permeate tubes are configured to extend through a portion of the vessel wall when the disc membrane assembly is positioned within the treatment chamber. The permeate tubes are further configured for rotation by the drive system.

Abstract: Provided are a suction apparatus for a fabric filter and a filtering device for liquid filtration using the same. A main suction slit and a sub-suction slit are provided in parallel by a partition. Thereby, pile threads undergo delayed straightening and fluctuation while going through the sub-suction slit and then are rapidly straightened in the main suction slit. Thus, a back-washing effect can be further improved.

Abstract: A disc filter for dewatering cellulose fiber suspensions comprising disc-shaped filter elements (11) carried by a rotor shaft (7) in order to rotate inside a vessel (2) while being partly immersed in a suspension received in the vessel. Each filter element comprises several filter sectors (12) distributed about the rotor shaft. Loosening members (25) are provided for loosening fiber material that has been filtered out of the suspension and deposited on a filtering lining (13) of the respective filter element. Receiver chutes (30) are located in the part of the vessel where the filter sectors (12) are rotated down into the suspension from a position above the suspension. The receiver chutes receive loosened fiber material together with flushing liquid from cleaning members (26) located above the receiver chutes to thereby allow the fiber material to be diluted in the receiver chutes to a desired dry content by means of this flushing liquid.

Abstract: A filter device for fluids, in particular for low viscosity fluids such as water, includes a filter housing (1) in which element holders (31) are provided for a plurality of filter elements (21). Filter medium (35) of each filter element in the filter housing (1) separates an unfiltered side (5) from a clean side (7). The filter housing (1) can be opened for inserting and removing the filter elements (21). A carrier in the form of a basket (19) is provided for the filter elements (21). The basket can be inserted into and removed from the filter housing (1). The filter elements (21) can be releasably secured at the basket.

Abstract: A filter device is configured to filter a liquid. The filter device includes a drum sized to receive the liquid and a plurality of filter panels coupled to the drum to define a plurality of discs. The liquid passes through at least a portion of one of the discs. Each filter panel includes a perimeter frame that defines a panel normal flow area and a filter media coupled to the perimeter frame. The filter media may be adapted to include a plurality of pleats.

Abstract: A filter device having a vent device for inhibiting formation of a vacuum in the filter device. The filter device includes a drum for receiving the liquid wherein the drum includes a drum headspace. The filter device also includes filter sets for filtering the liquid. The drum is rotated to enable cleaning of filter media. The filter device also includes a frame having spaced apart supports for supporting each of the filter sets. A fluid passageway extends between the supports, wherein the fluid passageway provides fluid communication between the tank headspace and a filter set to vent a filter set.

Abstract: A rotary disc filter device includes a rotary drum and one or more disc-shaped filter members secured about the drum. Each disc-shaped filter member includes a filter and a filter support comprising a series of modules. The modules each include a base that is secured to the rotary drum and a support arm projecting outwardly from the base. The modules are interconnected and disposed around the rotary drum.

Abstract: A pressure diffuser washer comprising: an outer wall, an inner wall adjacent to the outer wall, the inner wall defining annular baffle chambers between the outer wall and the inner wall, wherein each of the annular baffle chambers is configured to connect to a source of a wash liquid, a reciprocating screen assembly adjacent to the inner wall, the reciprocating screen assembly defining a first annular chamber between the inner wall and the reciprocating screen assembly, an area in the inner wall defining a gap associated with each of the annular baffle chambers, wherein the wash liquid from an annular baffle chamber flows through the gap into the first annular chamber, and an annular baffle screen plate covering the gap, wherein the annular baffle screen plate defines openings sized to prevent rocks and other large particulate debris from entering the annular baffle chambers.

Abstract: The present invention refers to a module (2) for assembly of a filter frame (1) for at least one filter disc (not shown) of a rotatable disc filter, which filter frame is provided for supporting at least two filter segments (not shown), which filter segments together form the outer part of said filter disc. The module (2) comprises an intermediate member (5) intended to beat least partially provided between two adjacent filter segments.

Abstract: A filter element (2) for use in a disc filter (1), wherein a plurality of filter elements (2) are arranged on a rotor shaft (3) in a manner allowing liquid communication between the inside (4) of the filter elements (2) and the inside (5) of the rotor shaft (3), for the filtering of liquids. The filter element (2) includes a framework (6) carrying a filter cloth (7) on both its side surfaces (8), wherein the framework (6) and the filter cloth (7) are permanently joined forming a single use filter element (2) and the filter element has at least one passage (21) in each edge (22) for liquid communication between the inside (4) of adjacent filter elements. A disc filter (1) including a single use filter element (2) is also provided.

Abstract: A filter device having a vent device for inhibiting formation of a vacuum in the filter device. The filter device includes a drum for receiving the liquid wherein the drum includes a drum headspace. The filter device also includes filter sets for filtering the liquid. The drum is rotated to enable cleaning of filter media. The filter device also includes a frame having spaced apart supports for supporting each of the filter sets. A fluid passageway extends between the supports, wherein the fluid passageway provides fluid communication between the tank headspace and a filter set to vent a filter set.

Abstract: A filter device for filtering a liquid which includes trash. The device includes a drum for receiving the liquid and trash, wherein the drum includes at least one drum aperture. The device further includes a first pair of filter panels which are adapted for filtering the liquid. The filter panels are spaced apart to form a cavity for receiving the liquid and trash. The device further includes a frame for supporting the filter panels, wherein the frame is coupled to the drum. The frame includes a frame aperture wherein the frame aperture and the cavity form a volume having a cross sectional area sized substantially equal to or greater than the drum aperture and wherein said volume extends to a second pair of filter panels to enable liquid and trash which pass through the drum aperture to also pass through the frame aperture to the second pair of filter panels.

Abstract: An apparatus is disclosed for separating minerals in drilling fluid based primarily on density. The separator creates and maintains a slurry with a controllable density for separating minerals from drill cuttings. The density is controlled through the use of an electrode array. The separator comprises a housing have a fluid inlet for the fluid mixture, at least one rotating disk having an electrode array positioned inside the housing to suspend a first material of the fluid mixture, and a mechanism configured to rotate the disk. A second and third material is separated from the fluid via use of the suspended first material.

Abstract: The adaptation of a rotary drum filter structure to a accommodate filter discs within the existing rotary drum filter structure while using the existing rotary drum structure foundation, piping, etc. to allow a filter disc operation.

Abstract: A mesh screen, for example for filtration wheels used in water treatment, provides a set of pleated filter elements assembled by in-molding the mesh into stringers subdividing a frame. Retention strips following the pleated edges of the filter elements at the stringers include apertures permitting direct clamping of the mesh near the stringers and the ability to visually inspect, after molding, engagement between the molded elements and the mesh while providing an increased engagement area between the mesh and elements of the over-molded frame.

Abstract: The disclosure relates to a filtration device that comprises a disc with a rim covering and stiffening a plurality of filtration sectors connected to taps provided on the outer wall of a rotary main shaft containing inner discharge channels and fit-inserted into said taps and into a crown comprising two parts concentric to the shaft, one which is secured to the shaft while the other is removable, characterised in that said rim is provided with openings each intended for receiving a removable connection flange bearing, on the one hand, a radial strut clamped between two adjacent sectors for the relative clamping thereof and interacting, on the other hand, with a spring quick fastener for locking the strut under tension between the sectors. The disclosure also relates to a method for assembling and maintaining said filtration device.

Abstract: A water treatment apparatus includes a tank, a driving unit, a filtered-water pipe, a filtering unit and at least one scraping unit. The tank includes a wall, an inlet pipe extending through an upper portion, and an outlet pipe extending from a lower portion. The driving unit is located on an external side of the tank. The filtered-water pipe extends throughout the tank and is connected to the driving unit. The filtering unit includes flat filtering bags located around the filtered-water pipe. The flat filtering bags can be spun together with the filtered-water pipe. The scraping unit includes scrapper assemblies each located between and in contact with two adjacent ones of the flat filtering bags.

Abstract: A system and method are provided in at least one embodiment to filter water through a vortex leading into a disk-pack turbine having an expansion chamber and outlets into a discharge chamber that leads to at least one discharge port. In a further embodiment, the system includes an intake module, a vortex module, a disk-pack module, and a motor for driving the disk-pack turbine. The intake module brings water into the system and routes the water to the vortex module that speeds up the water into a vortex that flows into the disk-pack turbine that discharges into a discharge chamber that leads to at least one discharge port. The disk-pack turbine includes a plurality of disks that are spaced apart forming chambers between the disks that provide at least one passageway between the expansion chamber and the discharge chamber.

Abstract: The present invention relates to a pressurized filtration plant that includes: a sealed tank (1) in which discs (2) are provided including filtering sectors (20) carried by a rotary shaft (3) and connected to collectors within said shaft, a dispenser (10) enabling the egress of filtrates, the discharge of spinning air and the intake of blowing air for releasing the spun cakes, at least one duct for supplying a liquid laden with solid particles, at least one duct or discharging the filtrates, and a hopper (1b) for recovering the solid particles, characterized in that the discs (2) are vertically arranged so that the lower portion thereof is submerged in buckets (4) covered with deflectors (41) and including means for scrapping solid material deposits on the outer walls thereof.

Abstract: A disc filter disposed around a drum for filtering water. The disc filter includes a frame structure and a plurality of filter segments arranged around the drum and secured to the support. Each filter segment includes a filter frame having first and second portions and filter material integrated with the first and second portions of the filter frame through an injection moulding process.

Abstract: The method and arrangement is for cleaning at least one of filter sheets and filter cakes in a pressurized white liquor filter with spray nozzles and driving fluid. The white liquor filter is used in a causticizing process in which green liquor is causticized before the white liquor filter by the addition of lime and in which it forms during the process a lime mud slurry. The white liquor filter 101 is used to separate white liquor from the lime mud. The driving fluid for the spray nozzle is constituted principally by the filtrate that is obtained from the filter.

Abstract: The invention relates to a membrane filtration device comprising a plurality of planar membrane filter elements which are combined to form a membrane package and are disposed within the membrane package parallel to and spaced apart from one another. A wall encloses the membrane package on all sides, and within which at least one inlet chamber which is connected to at least one inlet, and at least one outlet chamber which is connected to at least one outlet. An oscillation unit is connected to the membrane package and the wall to induce oscillation in a direction parallel to the membrane filter elements. The oscillation unit is connected to a frame which encloses the membrane package and which is connected to the wall of the membrane package by means of least one spring, whose main direction of spring action extends parallel to the plane of the membrane filter.

Abstract: A gravity-flow water purifier includes a treatment tank, a water yielding pipe, a filter unit, and a sliding sleeve unit. The treatment tank includes a tank wall, an insertion hole, a receiving chamber, and at least two slide rails provided on the inner surface of the tank wall. The sliding sleeve unit includes a reticulated frame in which the filter unit is disposed. In addition, at least two sliding blocks are provided on the outer periphery of the frame. The filter unit is installed in a bottom portion of the treatment tank so that a gravity flow through the filter unit is generated by the water level in the treatment tank. Cooperation between the sliding blocks and the slide rails allows the sliding sleeve unit and the filter unit to be easily installed in and removed from the treatment tank, thereby facilitating the cleaning and replacement of filter elements.

Abstract: A rotary disc filter device comprises a rotary drum and a plurality of disc-shaped filter members secured about the drum. Each disc-shaped filter member has a filtering material disposed on the outside thereof. A guide bar extends longitudinally across the disc-shaped filter members and has a movable carriage mounted thereon. One or more nozzles are operatively connected to the carriage for delivering cleaning fluid onto the filtering materials. The guide bar is rotates between a cleaning position and an adjustment position. When the guide bar is in the cleaning position, the nozzle is disposed adjacent to one of the disc-shaped filter members such that the nozzle is positioned to deliver cleaning fluid onto the filtering material. When the guide bar is in the adjustment position, the carriage is movable along the guide bar without interference from the disc-shaped filter members.

Abstract: Filter and replaceable filter leaf apparatus are provided. The filter includes a housing defining a cavity having fluid inlet and outlet ports and a lid member with a manifold coupled to the outlet port and being adapted to conduct a fluid flow between the outlet port and a plurality of attachment areas. Replaceable filter leafs are selectively movable through an opening into the housing cavity and attachable with the manifold at the plurality of attachment areas. The replaceable filter leafs include a filter envelope consisting of a filter panel, a nozzle member on the filter panel and defining a passageway adjacent an opening in the filter envelope for conducting fluids therethrough. The nozzle member is selectively attachable onto the manifold of the polishing filter apparatus at any one of the plurality of attachment areas.

Abstract: A disc filter includes several triangular sectors that are connected from their neck section to the body of the disc filter. The sectors form a relatively thin disc that is rotated during filtration in a basin that contains a suspension to be filtered. The side surfaces of the sector have openings through which liquid in the suspension passes into several essentially radial flow channels inside the sector to flow on to the neck section and away from the sector. A separating wall is formed between two adjacent radial flow channels. Furthermore, the sector is made of two side elements, which are of plastic material and the mating surfaces of which are placed against each other.

Abstract: A rotary disc filter device includes a rotary drum and one or more disc-shaped filter members secured about the drum. Each disc-shaped filter member includes a filter and a filter support comprising a series of modules. The modules each include a base that is secured to the rotary drum and a support arm projecting outwardly from the base. The modules are interconnected and disposed around the rotary drum.

Abstract: A filtering unit includes alternately arranged membranes and positioning rings. A seal is secured to each of the positioning rings. Each of the positioning rings includes an annular body, arched cutouts defined in an internal edge of the annular body, first and second engaging members formed on the annular body, and at least one slot defined in the annular body. Each of the first engaging members is located near an end of a related one of the arched cutouts. Each of the second engaging members is located near another end of a related one of the arched cutouts. The second engaging members can be engaged with the first engaging members of another positioning ring extending through the arched cutouts. Each of the seals includes two sealing portions extending on two opposite faces of the annular body and at least one connecting portion extending between the sealing portions through the slot.

Abstract: The horizontal ore filter has a plurality of filter elements covering the circular filter surface thereof and a sub-frame supporting the filter surface. In one aspect, each filter element has a longitudinal concave curvature therein. In another aspect, each sector frame has side flanges thereon. The sub-frame has a plurality of T-bars extending radially along the circular filter surface and each one of these T-bars supports the side edges of two adjacent filter elements. Upon installation of the filter elements to the sub-frame, the sector frames are held tight against the T-bars to ensure a good seal between adjacent filter elements and between each filter element and the sub-frame of the machine.

Abstract: The invention relates to a filtration cell that comprises a tank with a bottom wall (2) and four side walls extending upwards from the bottom wall as well as an upward opening, the four side walls including two opposite longitudinal walls (3, 5) as well as a front facing wall (4) and a rear facing wall connecting them, a filtration bed (7) supported in the tank, an outlet opening for discharging the filtrate, and a covering flap (24) protruding outwards from the top of one of said longitudinal walls, the longitudinal wall (5) opposed to that fitted with the flap including a lower portion (25) extending upwards from the bottom wall (2) and an upper portion (26) extending slantedly upwards and inside the tank from the top of said lower portion (25), and/or the front facing wall (4) comprises a bottom portion (27) extending upwards from the bottom wall (2) and a top portion (28) extending slantedly upwards and inside the tank from the top of said bottom portion (27).

Abstract: A test paper includes a porous membrane capable of separating an object that should be filtered out of a sample by filtration, the porous membrane carrying a reagent capable of reacting with a specified component of the sample to result in coloring. The porous membrane includes a first layer having a surface on which the sample is supplied and a second layer having a surface at which sample percolation and measuring are effected, the first layer composed of large pore portions, the surface of the first layer consisting of a smooth surface having open pore portions, the second layer composed of minute pore portions the surface of the second layer consisting of a surface having open pore portions. The porous membrane has a thickness of 50 to 200 ?m and a porosity of 60 to 95%.

Abstract: A rotary disc filter device comprises a rotary drum and a plurality of disc-shaped filter members secured about the drum. Each disc-shaped filter member has a filtering material disposed on the outside thereof. A guide bar extends longitudinally across the disc-shaped filter members and has a movable carriage mounted thereon. One or more nozzles are operatively connected to the carriage for delivering cleaning fluid onto the filtering materials. The guide bar is rotates between a cleaning position and an adjustment position. When the guide bar is in the cleaning position, the nozzle is disposed adjacent to one of the disc-shaped filter members such that the nozzle is positioned to deliver cleaning fluid onto the filtering material. When the guide bar is in the adjustment position, the carriage is movable along the guide bar without interference from the disc-shaped filter members.

Abstract: The present invention refers to a module (2) for assembly of a filter frame (1) for at least one filter disc (not shown) of a rotatable disc filter, which filter frame is provided for supporting at least two filter segments (not shown), which filter segments together form the outer part of said filter disc. The module (2) comprises an intermediate member (5) intended to beat least partially provided between two adjacent filter segments.

Abstract: A filter device having a vent device for inhibiting formation of a vacuum in the filter device. The filter device includes a drum for receiving the liquid wherein the drum includes a drum headspace. The filter device also includes filter sets for filtering the liquid. The drum is rotated to enable cleaning of filter media. The filter device also includes a frame having spaced apart supports for supporting each of the filter sets. A fluid passageway extends between the supports, wherein the fluid passageway provides fluid communication between the tank headspace and a filter set to vent a filter set.

Abstract: A filter device includes a housing (2) having at least two rotation bodies (4,) which are arranged therein and are driven by a shaft (3). The rotation bodies (4) are designed and arranged for producing a centrifugal pumping effect. A guidance device (7) is provided between the rotation bodies (4), which connects the pressure side (6) of a first rotation body (4) to the suction side (5) of a rotation body (4, 18) arranged therebehind in the flow direction (8). The intermediate spaces between the rotation bodies are provided with a filter arrangement.

Abstract: A rotary disc filter device comprises a rotary drum and a plurality of disc-shaped filter members secured about the drum. Each disc-shaped filter member has a filtering material disposed on the outside thereof. A guide bar extends longitudinally across the disc-shaped filter members and has a movable carriage mounted thereon. One or more nozzles are operatively connected to the carriage for delivering cleaning fluid onto the filtering materials. The guide bar is rotates between a cleaning position and an adjustment position. When the guide bar is in the cleaning position, the nozzle is disposed adjacent to one of the disc-shaped filter members such that the nozzle is positioned to deliver cleaning fluid onto the filtering material. When the guide bar is in the adjustment position, the carriage is movable along the guide bar without interference from the disc-shaped filter members.

Abstract: A filter and replaceable filter leaf apparatus are provided. The filter includes a housing defining a cavity having fluid inlet and outlet ports and a lid member with a manifold coupled to the outlet port and being adapted to conduct a fluid flow between the outlet port and a plurality of attachment areas. Replaceable filter leafs are selectively movable through an opening into the housing cavity and attachable with the manifold at the plurality of attachment areas. The replaceable filter leafs include a filter envelope consisting of a single substantially rectangular filter panel, a nozzle member on the filter panel and defining a passageway adjacent an opening in the filter envelope for conducting fluids therethrough, and a porous grid member contained within the filter envelope. The nozzle member is selectively attachable onto the manifold of the polishing filter apparatus at one of the plurality of attachment areas.

Abstract: An apparatus for filtering liquid that includes a filter having an external surface; a rotatable shaft extending through the filter; and a movable member coupled to the rotatable shaft. The movable member is configured to impart a suction force at various locations across the external surface of the filter. The movable member has a trailing portion that extends further than the leading portion in the direction toward the filter.

Abstract: A test paper includes a porous membrane capable of separating an object that should be filtered out of a sample by filtration, the porous membrane carrying a reagent capable of reacting with a specified component of the sample to result in coloring. The porous membrane includes a first layer having a surface on which the sample is supplied and a second layer having a surface at which sample percolation and measuring are effected, the first layer composed of large pore portions, the surface of the first layer consisting of a smooth surface having open pore portions, the second layer composed of minute pore portions the surface of the second layer consisting of a surface having open pore portions. The porous membrane has a thickness of 50 to 200 ?m and a porosity of 60 to 95%.

Abstract: A filter system for use in a three-phase slurry reactor is provided. The filter system comprises one or more bundles of a plurality of filter elements for separating liquid from a mixture of liquid and solids contained in the reactor. Each filter bundle is connected to a product transfer conduit transporting separated liquid to a location outside of and downstream from the reactor. The transfer conduit is provided with means for backflushing the filter bundle and guard filter means.

Abstract: The present invention relates to a method of treating lime mud slurry being generated in a causticizing process in a pulp mill in a disc filter, in which method the lime mud is fed in the filter, thickened on the filter discs and removed from the filter discs. The lime mud is treated in at least two stages in one and the same disc filter in such a way that the lime mud slurry entering the filter is fed onto only a part of the filter discs, on which lime mud is thickened and removed from the discs, and the removed lime mud is re-slurried in liquid, and the lime mud slurry thus obtained is fed onto a second part of the filter discs, on which lime mud is thickened and removed from the filter and led into a subsequent process stage. The invention also relates to an apparatus.