Abstract: A rotary disc filter includes one or more filter discs secured to a rotary drum and include a series of circumferentially spaced backwash guides disposed in the filter disc. During backwashing, the backwash guides function to engage a mixture of backwash and suspended solids and guide or direct the mixture to a sludge trough disposed in the disc filter. The backwash guides generally assure that a greater percentage of the backwash and suspended solids mixture end up in the solids trough.

Abstract: An apparatus for removing sand from a well fluid includes a pressure vessel having an inlet and an outlet. The well fluid flows into the pressure vessel through the inlet and flows out of the pressure vessel through the outlet. A screen is positioned at least partially within the pressure vessel and configured to remove the sand from the well fluid. At least a portion of the sand that is removed from the well fluid at least partially obstructs one or more openings in the screen. A cleaning assembly is positioned at least partially between the pressure vessel and the screen and configured to remove the sand that is obstructing the one or more openings in the screen during a screen-cleaning operation.

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 device for removing impurities from a liquid, preferably sewage, includes a pivoted filtering drum having a filtering surface, equipped with a drum drive operatively connected to the filtering drum to turn the filtering drum around a rotating axis. A cleaning system cleans the filtering surface and has a guide and a spray nozzle arrangement movable back and forth along the guide. Cleaning liquid can be sprayed on the filter surface. The spray nozzle arrangement may include at least one carrier movable back and forth along the guide and at least one spray nozzle mounted on the carrier so that it can be moved around an axis. A related method for cleaning a corresponding device is disclosed.

Abstract: A device is provided for cleaning a filter cloth that forms a part of a filter element in a rotary disc filter. The device includes a flush tube and a spray nozzle operatively connected to the flush tube for receiving a cleaning fluid from the flush tube and directing the cleaning fluid onto the filter cloth.

Abstract: A continuous microfiltration machine for removing suspended solid particles from process and waste water comprises a container (2) with an inlet conduit (4) defining a flow direction (F), and having therein an influent chamber (7) for feeding the liquid to be filtered, a treatment chamber (8) with a bottom wall (9), at least one pair of filter disks (10) keyed to a shaft (12) perpendicular to the flow direction (F) and having inner filter surfaces (10?) outer surfaces (10?) and outer peripheral edges (15) in sliding contact with the bottom wall (9), an effluent chamber (17) for receiving the filtered liquid, with a discharge conduit (18), drive means (13, 14) for imparting rotation to the disks, first jet washing means (20) directed against the outer surfaces (10?) of the disks (10) for removing the particles retained thereby, a first collecting duct (24) for collecting the removed particles, which is interposed between the disks (10) and has substantially parallel side edges (25) located at a predetermined m

Abstract: A method associated for treating a precoat on a rotating filtering surface of lime sludge filter including: accumulating a precoat of lime sludge on the filtering surface by rotating the filtering surface in a first direction through a lime sludge slurry; after accumulating the precoat, rotating the filtering surface in an opposite direction to the first direction; while rotating the filtering surface in the opposite direction, spraying a liquid onto the precoat on the filtering surface wherein the spraying is applied to the precoat above a scraper adjacent the filtering surface and the spraying removes at least a portion of the precoat from the filtering surface, and flowing the removed precoat over the scraper and into a basin.

Abstract: A neck element of a disc filter sector and a disc filter sector. A sector (5) is provided with a blade part (11) having a filtering surface and a neck part (12) coupling the blade part to a disc filter (1). The neck part has an inner space through which liquid runs from the sector. The inner space of the neck part is provided with at least one support element (18) to prevent opposite flanks (19) defining the neck part from moving in relation to one another. The sector may comprise a separate neck element (20) that may be coupled to the blade part. In that case the neck element is provided with at least one inner support element.

Abstract: The invention relates to a filtering device (100) for highly viscous fluids, having at least two parallel screen plungers (11, 11?) which are arranged in a displaceable fashion in screen plunger bores of a housing (10) and which have in each case at least one screen cavity (13; 13?) in which at least one filter element (14, 14?) is arranged, wherein the housing (10) has an inflow opening (21) from which, on the untreated side, at least one flow duct (22) leads to each screen plunger bore, and said housing has at least one flow duct (32) which, on the clean side, leads from each screen plunger bore to an outflow opening (31). On the untreated side and/or on the clean side, in each case one common flow duct (22, 32) leads rectilinearly along both screen plunger bores and, in a production position, tangentially intersects the screen cavities (13; 13?).

Abstract: A rotatable basket extractor for use in extracting oil from oleaginous feed material is disclosed. The extractor includes a rotatable rotor that includes a plurality of baskets extending radially outward from a central shaft, and the baskets receive and transport the oleaginous feed material while a motor rotates the baskets between a feed inlet and a feed outlet. The rotor is located within a housing and positioned above a screen through which miscella that drains from the feed material passes. The miscella is collected in a trough located below the screen and is sprayed onto the feed material bed positioned within the baskets in a counter-current manner. A suction device pulls vapor down between the particles of the feed material bed to decrease the drainage time of the miscella through the feed 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 liquid extraction assembly for extracting liquid from a mass comprising a housing having an inlet and an outlet and a path therebetween. The housing includes a rotating screen adjacent the path. The housing can have a nozzle at the inlet. The housing can include an inflatable member providing a seal adjacent the screen for maintaining the mass in the path. The housing can include a center seal rotating with the screen and a fixed scraper in the path and adjacent the at least one rotating screen, with the center seal including a notch for accepting a tip of the scraper therein. The housing can also include side walls and an annular seal located between the side walls, with the annular seal defining an outer periphery of the path and having a rotating top end portion allowing an area of the outlet to change.

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 filtering device (100) for plastic melts exhibits at least one screen plunger (10) arranged movably between an inlet channel (5) and an outlet channel (6) of a housing (1) and containing replaceable, three-dimensional filter elements (25). The inside of the filter elements (25) is connected to at least one melt channel (11, 12) formed in the screen plunger (10). The melt channel is connected to the inlet or outlet channel (5, 6) of the housing (1) when in the production position. The screen plunger (10) exhibits at least one receiving chamber (14) that can be closed using a cover (16) on the face side. Several filter elements (25) are bundled with a central distribution element (20) to a filter cartridge (30) that can be placed in the receiving chamber (14).

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: Provided is a filtration cassette having a rigid body configured for externally supporting a filtration media disposed thereover and having at least one filtering surface configured with a flow path facilitating filtered fluid flow from a space extending between the filtration media and the filtering surface, and extending towards an outlet terminal. Also provided is a filtration segment including such a filtration cassette and where the filtration media is a filtration thread tensionally coiled over the filtration cassette at a multi-layered and tight configuration. Further provided are a plurality of such filtration segments which are configured into a disk-type assembly forming a filtration unit for a filtering system.

Abstract: Apparatus and methods are disclosed for mechanical axial vibration in membrane separation treatment processes. The apparatus includes a separation membrane element having an axial dimension, a membrane support structure having the element therein, and means for vibrating the membrane element (hydrodynamically or using motors) in the axial dimension.

Abstract: The present invention relates to a membrane separation method and a relevant equipment, in particular to a method and an equipment for membrane separation utilizing concentration polarization during membrane filtration process, especially, to a concentration process and equipment and a drawer special for drawing a concentration polarization layer. The direct removal of the concentration polarization layer from membrane surface not only decreases the adverse influence of concentration polarization on membrane separation but also obtains concentrated retention components, thereby significantly improving the ability to maintain membrane flux, solving the twinborn problems concerning concentration polarization and membrane fouling during the membrane separation process, and achieving a high-efficiency concentration for retention components.

Abstract: Method for the liquid solid separation of material mixtures and suspensions in which the material mixture under pressure is fed into a closed chamber having at least one filter surface and a hydrostatic pressure is generated within said chamber for separating the liquid phase. After separating the liquid phase the chamber is opened and the filter surface together with the filter cake is removed from said chamber. The material mixture firstly is treated by the means of hydrostatic pressure of about up to 0.2 bar, wherein 80 to 90% of the fed volume is removed as filtrate. Thereafter the concentrated remaining volume is drawn off and is further treated in the closed chamber with a pressure of up to 5 bar. By reducing the volume of the chamber finally with a pressure of up to 50 bar the remaining filtrate is separated.

Abstract: The present invention relates to a membrane separation method and a relevant equipment, in particular to a method and an equipment for membrane separation utilizing concentration polarization during membrane filtration process, especially, to a concentration process and equipment and a drawer special for drawing a concentration polarization layer. The direct removal of the concentration polarization layer from membrane surface not only decreases the adverse influence of concentration polarization on membrane separation but also obtains concentrated retention components, thereby significantly improving the ability to maintain membrane flux, solving the twinborn problems concerning concentration polarization and membrane fouling during the membrane separation process, and achieving a high-efficiency concentration for retention components.

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 scrappers each located between and in contact with two adjacent ones of the flat filtering bags.

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: 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 system for extracting liquid from a mass comprising a portable platform having an upper surface, a system mass input, a polymer feeding and blending system on the upper surface, a liquid extraction assembly on the upper surface, and piping having a first section between the system mass input and the polymer feeding and blending system, and a second section between the polymer feeding and blending system and the liquid extraction assembly. The system is configured to have mass inputted into the system mass input, transport the mass to the polymer feeding and blending system through the first section of the piping, inject polymer into the mass in the polymer feeding and blending system, and transport the mass from the polymer feeding and blending system to the liquid extraction assembly. Pressure from mass forced into the liquid extraction assembly forces liquid in the mass to exit the mass.

Abstract: A system for extracting liquid from a mass comprising a portable platform having an upper surface, a system mass input, a polymer feeding and blending system on the upper surface, a liquid extraction assembly on the upper surface, and piping having a first section between the system mass input and the polymer feeding and blending system, and a second section between the polymer feeding and blending system and the liquid extraction assembly. The system is configured to have mass inputted into the system mass input, transport the mass to the polymer feeding and blending system through the first section of the piping, inject polymer into the mass in the polymer feeding and blending system, and transport the mass from the polymer feeding and blending system to the liquid extraction assembly. Pressure from mass forced into the liquid extraction assembly forces liquid in the mass to exit the mass.

Abstract: A filtration appliance comprised of two types of convening disks, whereon opposing, contacting surfaces are textured or channeled, purveying passage and filtration of fluids traversing between the convening disks. A plurality of parallel, spiraling grooves on both sides of conveyance disks purvey channeling for fluid ingress and egress, inlet grooves spiral radially inward from the outside circumference, decreasing in width until terminating prior to the inside circumference, outlet grooves spiral radially outward from the inside circumference, decreasing in width until terminating prior to the outside circumference. Topologic disks conveying homogeneously textured surfaces for filtration sandwich conveyance disks. The textured topologic surface is pressed upon the conveyance surface between the grooves.

Abstract: A system (10) for extracting liquid from a mass comprising a portable platform (12) having an upper surface (14), a system mass input (16), a polymer feeding and blending system (18) on the upper surface (14), a liquid extraction assembly (40) on the upper surface (14), and piping (22) having a first section (24) between the system mass input (16) and the polymer feeding and blending system (18), and a second section (26) between the polymer feeding and blending system (18) and the liquid extraction assembly (40). The system is configured to have mass inputted into the system mass input (16), transport the mass to the polymer feeding and blending system (18) through the first section (24) of the piping, inject polymer into the mass in the polymer feeding and blending system (18), and transport the mass from the polymer feeding and blending system (18) to the liquid extraction assembly (40). Pressure from the mass forced into the liquid extraction assembly (18) forces liquid in the mass to exit the mass.

Abstract: An arrangement for removing chips from a machining coolant prior to filtering out the finer solids in a main filter. A coarse weave belt is frictionally driven along a strainer bottom wall of an auxiliary tank suspended above the main filter tank, the permanent media belt of a coarse weave which allows the liquid and suspended finer solids to pass through while capturing the chips. A powered drag conveyor frictionally engages and drives the permanent media belt through the auxiliary tank, each diverging when returning across the top and bottom respectively of the auxiliary tank prior to being recirculated through the auxiliary tank.

Abstract: Apparatus for cleaning a filter cloth in a filtering device with a rotatable drum having an inlet for the liquid to be filtered. The drum has in its circumferential surface openings through which the liquid to be filtered is conducted in a filtering direction out of the drum for filtering through a filter cloth. The cleaning apparatus includes at least one spray nozzle which is adapted to spray cleaning liquid onto a portion of the filter cloth in a direction opposite to the filtering direction. Moreover the apparatus comprises a driving device for providing a reciprocating motion of the spray nozzle. The driving device has a coupling which is adapted to transform the rotary motion of the drum into the reciprocating motion of the spray nozzle, with such a ratio that the rotary motion of the drum and the reciprocating motion of the spray nozzle are out of phase with each other.

Abstract: The invention relates to a machine for micro-filtering solid particles suspended in a liquid stream comprising: a couple of coaxial filtering discs each rotating round its own axis arranged horizontal and normal to direction of the flow to be treated and at least a partially cylindrical wall defining together with the rims of said couple of discs a hydraulic sealing coupling so as to enclose the liquid treating space comprising at least the rotation axis. Each disc of said couples of discs is provided with one or more washing ramps arranged outside said treating chambers and provided with nozzles throwing water against said discs at the portions emerging from the treating chamber. The washing water is collected by at least one liquid conveyance channel feeding the liquid back to the purification plant arranged upstream said machines.

Abstract: An arrangement for removing chips from a machining coolant prior to filtering out the finer solids in a main filter. A coarse weave belt is frictionally driven along a strainer bottom wall of an auxiliary tank suspended above the main filter tank, the permanent media belt of a coarse weave which allows the liquid and suspended finer solids to pass through while capturing the chips. A powered drag conveyor frictionally engages and drives the permanent media belt through the auxiliary tank, each diverging when returning across the top and bottom respectively of the auxiliary tank prior to being recirculated through the auxiliary tank.

Abstract: The invention relates to a machine for micro-filtering solid particles suspended in a liquid stream comprising: a couple of coaxial filtering discs (5, 6, 20, 21, 91, 92, 93, 94) rotating around its own axis (71) arranged horizontal and normal to direction of the flow to be treated and at least a partially cylindrical wall (7) defining together with the rims of said couple of discs a hydraulic sealing coupling so as to enclose the liquid treating space comprising at least the rotation axis. Each disc of said couples of discs is provided with one or more washing ramps (14, 15) arranged outside said treating chambers and provided with nozzles throwing water against said discs at the portions emerging (51, 61) from the treating chamber. The washing water is collected by at least a liquid conveyance channel (8) feeding the liquid back to the purification plant arranged upstream said machines.

Abstract: A device for filtering a liquid substance comprising a container (1) having an inlet (2), a rotor (6), an inner rotor part (7), at least one disc filter (8). Spray nozzles are provided for releasing material filtered away from the substance and deposited on the filter disc. Furthermore there are conveyors (17) for removing the material released.

Abstract: The present invention is directed to an electrolytically produced screening material for the removal of fibers from suspensions during the production of pulp and paper. The screening material is a thin, smooth metal foil having perforations on the order of 10-80 .mu.m. And an open area of 5% to 40%.

Abstract: Method and apparatus are provided for separating coarse and ultrafine solids from a liquid stream to produce a substantially dry solids discharge and a clarified liquid. Apparatus is provided comprising a combination of a settling tank, a plurality of filter screens spaced along an endless link-chain conveyor, a screen vibrator and directed air streams. In operation, coarse solids settle preferentially to the tank bottom. Ultrafines solids remain in suspension. Relatively coarse filter screens are conveyed from a point outside the tank to traverse a prolonged path through the liquid. Ultrafine solids are captured on the screens, by filtering the liquid through an ever finer build-up of filter cake. The relatively large number of passes of the screens through the liquid provides effective filtering of suspended solids. Further, the screens dredge settled solids from the tank bottom.

Abstract: A multi-function fluid treatment system which can filter fluids or diffuse gases into liquids. To achieve filtration, the system includes a housing with multiple filter cartridges therein. The cartridges are connected to a drive system which rotates them in unison. Fluids to be filtered enter the housing and surround the cartridges. Cartridge rotation scrubs solids from the cartridges and promotes fluid flow therein. A separate cleaning system is also provided which involves a cartridge wiping assembly having multiple wiping members thereon. The wiping members directly contact the cartridges to remove collected debris and preferably involve multiple bristles secured to a vertical support member. The support member may consist of dual wires secured together with the bristles therebetween. The bristles can also be arranged in elongate rows (one row per cartridge) on the support member. In either embodiment, the wiping assembly improves filtration efficiency and reduces maintenance requirements.

Abstract: A rotating filter including a container (11) for a liquid or suspension to be filtered and a rotor structure (17, 21, 22, 25, 26) being provided at its outer periphery with a filter medium arranged in the shape of at least one circular ring (33) having its center in the rotational axis of the rotor structure and an extension in the radial direction substantially from the outer circumference of the rotor structure. Removal and discharge means (73, 93) is arranged radially outside the outer periphery of the rotor structure, extends substantially thereto along the radial extension of the filter medium and is adapted to remove filter cake material from the filter medium and lead it radially outward towards the radially outer limit of the filter medium.

Abstract: An interior wedge wire drum screen is mounted wholly within an exterior drum screen of narrower wedge wire spacing, and both are mounted to a frame and caused to rotate about a common central axis. One end of the outer drum is open and the other is closed by a disc-shaped drum head. The inner drum has an open end which is spaced inward of the open end of the outer drum. The waste water is presented to the surface of the inner drum screen by a waste water infeed which employs a vertical column. The column extends upwardly of an inlet and has a gradually increasing cross-section for reducing the flow of velocity of the waste water. A horizontal trough extends along the axis defined by the drums and communicates between the top of the column and a tray. The edges of the tray terminate in weirs which are parallel to the sides of the inner drum. Water flows in a smooth sheet over a weir to impact the sides of the inner screen with low velocity.

Abstract: A filter apparatus comprises a plurality of rod-shaped filter elements disposed within a cylindrical vessel on at least one circular array concentric with the vessel axis, and extending parallel to the vessel axis, said filter elements being mounted in one of the vessel end walls and drained through this vessel end wall. Rotatably mounted in the opposite vessel end wall is a rotor comprising a plurality of agitator elements extending radially spaced from and parallel to the filter elements. The filter elements are provided with individual filtrate drains adapted to be individualy monitored to ascertain the quality of the filtrate. Each filtrate drain may be provided with a valve operable to deactivate the associated filter element in the case of damage thereto.

Abstract: An interior wedge wire drum screen is mounted wholly within an exterior drum screen of narrower wedge wire spacing, and both are mounted to a frame and caused to rotate about a common central axis. One end of the outer drum is open and the other is closed by a disc-shaped drum head. The inner drum has an open end which is spaced inward of the open end of the outer drum. The waste water is presented to the surface of the inner drum screen by a waste water infeed which employs a vertical column. The column extends upwardly of an inlet and has a gradually increasing cross-section for reducing the flow of velocity of the waste water. A horizontal trough extends along the axis defined by the drums and communicates between the top of the column and a tray. The edges of the tray terminate in weirs which are parallel to the sides of the inner drum. Water flows in a smooth sheet over a weir to impact the sides of the inner screen with low velocity.

Abstract: An apparatus for filtering liquids, especially for recovering fibers from white water, includes rotatable filter discs at least partially immersed in the liquid to be filtered, and a shaft wall connected to the discs forming a circular cylindrical filtrate chamber, which extends centrally through the discs. A rigid stationary partition wall extends in the filtrate chamber dividing the latter into at least two axial channels. The partition wall is spaced from the shaft wall and arranged such that all of said axial channels receive various fractions of filtrate, respectively. Filtrate discharge means is provided for discharging said fractions of filtrate respectively from the respective axial channels, such that the pressure prevailing in the filtrate of each channel is at least substantially as high as atmospheric pressure.

Abstract: Apparatus for continuously separating a solid fraction from a liquid fraction in a mixture of such fractions has a stationary cylindrical vessel which is filled with the mixture and confines a rotary carrier as well as a battery of parallel disc-shaped filters mounted on and rotating with the carrier. The filters define internal chambers for separated liquid fraction and have foraminous walls which flank the respective chambers and intercept the solid fraction. The intercepted solid fraction is removed by stationary devices having receptacles immersed in the mixture, defining internal compartments for solid fraction and carrying sealing elements which prevent penetration of mixture from the internal space of the vessel into the compartments. The separated liquid fraction is evacuated fom the vessel through a channel in the carrier, and the solid fraction is evacuated from the internal compartments by suction and/or mechanically.

Abstract: A disc filtering apparatus for filtering liquids, such as fiber pulps suspensions, includes hollow filter discs, each of which has two opposed side walls of filter material. A plurality of circumferentially spaced support arms extend within each hollow filter disc, for supporting the side walls of filter material. Between the support arms, each side wall of filter material is supported by at least one wire member extending substantially along the filter disc and attached to the support arms.

Abstract: An apparatus for filtering liquids, such as fibre pulp suspensions, includes annular hollow filter discs each of which has two annular liquid pervious, opposed walls covered with filter material, spray nozzle means for cleaning the filter material, and means providing relative movement between the filter material and spray nozzle means. The annular opposed walls of each filter disc are only attached to each other at their radially outer ends, whereas they are spaced from each other at their radially inner ends, such that an annular opening is defined between the interior of the filter disc and a filtrate chamber extending centrally through the filter discs. The spray nozzle means extends from the filtrate chamber through the annular opening into each filter disc. As a result, an extremely pure fine fraction can be produced, clogging of the filtering material is efficiently counteracted, and the operative part of the filter material can be increased.

Abstract: A disk filter for filtering mat forming suspensions is provided with a hollow shaft for receiving a flow of fine fraction created by hydrostatic pressure difference between the suspension to be filtered and the fine fraction in the hollow shaft. According to the invention, each disc is provided with a number of fine fraction chambers communicating with the interior of the hollow shaft via respective holes in the circumferential wall of the shaft. Each chamber is arranged, such that it functions as a dropleg during movement upwards, with the result that the coarse particle (fibre) concentration of the created coarse fraction is increased.

Abstract: A filter for continuous filtering of a suspension under pressure and/or vacuum comprises a vessel (1) having a center axle (2) on which filter discs (3) are arranged at a distance from each other along the central axle. The filter discs consist of filter sectors having surrounding filter cloth and internal channels and between the filter sectors and an outlet from the vessel (1) there is a connection in the central axle (2). Moreover, a scraper (7) is arranged for removing the filter cake (8) on the filter cloth obtained during the filtering operation and a vertical outlet pipe (12) receives the scraped-off filter cake material. The central axle (2) is formed with only one common channel for the filtrate and the gas from all filter sectors in the vessel (1) and consists of a tube.

Abstract: A cycle of filtration is realized for liquids containing solids in suspension and a rotary filter, suited to realize and cycle, where the filtration is carried out by a rotary drum fitted with a filtering surface (2), immersed in a tank containing the liquid to be filtered (26). The phase of the separation of the filtered material deposited on the filtering surface is preceeded by a phase of removal of the material from the filtering surface carried out by using air blown from a slit and it is followed by a phase of washing of the filtering surface, carried out by a plurality of sprayers.

Abstract: Disclosed is a filter press comprising a substantially cylindrical vessel, a plurality of filter elements disposed in the vessel parallel to one another, and a rotor having a rotor shaft rotatably mounted in the vessel and a plurality of rotor elements fixedly connected to the rotor shaft and extending each between two adjacent filter elements, the surface of the rotor elements being adapted to be forced towards the filter elements for mechanically compressing filter cakes accumulated thereon, wherein the axis of the vessel is disposed in an upright position, the filter elements and rotor elements being formed as cylindrical wall members disposed in concentric relationship to one another with the rotor elements extending into the spaces between adjacent filter elements and being secured to a mounting structure connected to the rotor shaft, while the filter elements are supported on a carrier grid in the vessel.

Abstract: A device for fractionating pulp suspensions has a series of vertical filter sheets attached to a horizontal shaft. Suspension is sprayed against the sheets to effect a separation of coarse and fine solids. Cleansing liquid is also sprayed against the sheets to keep the filter holes open and the fabric sheets are movable with respect to the sprays.

Abstract: The present invention relates to a method and an apparatus for washing pulp according to which method the pulp is supplied onto a movable liquid-pervious support surface to form a substantially continuous layer; and washing liquid is supplied to the pulp layer and passed in several successive washing phases through different areas of the layer in such a way that the washing liquid gradually flows in the opposite direction compared with the flow direction of the pulp layer. According to the invention the washing liquid is divided in two or more partial flows which pass alternately through different washing phases in such a way that the washing liquid which in one phase has passed through the pulp layer flows past at least the washing phase preceding it in the flow direction of the pulp layer. The apparatus of the invention preferably includes a rotating cylinder having a casing surface of which serves as the liquid-pervious support surface for the pulp.