Abstract: A waste disposal system separates human wastes into solid and liquid parts for subsequent treatment such as microbial decomposition treatment and/or activated sludge treatment. The system includes an outer box. A cylindrical member made of a water-permeable material is received in the outer box. A top plate closes the top openings of the outer box and the cylindrical member. The latter has an open bottom. A helical rotary brush is mounted on a vertical rotary shaft extending through the top plate into the cylindrical member so as to be coaxially received in the cylindrical member. The top plate is formed with a port through which waste is adapted to be introduced into the cylindrical member. A closure member closes the bottom opening of the space defined between the outer box and the cylindrical member and is formed with a discharge port.

Abstract: A filter apparatus for liquids containing impurities, in particular solid particles, preferably for filtering plasticized thermoplastic synthetic plastic material, has a housing (1) in which at least one stationary, substantially flat filter (5) is disposed. The liquid to be cleaned is supplied to the filter (5) in the region of its periphery through at least one supply channel (3). The cleaned liquid is conducted off the housing through at least one downstream channel (7). At least one scraper element (17) is pressed with its scraping edge (31) against the upstream-side surface (11) of the filter (5), this scraper element (17) being movably connected to a scraper carrier (12) which can be rotated by a drive means (15) around an axis which is directed substantially perpendicular to the upstream-side surface (11) of the filter (5).

Abstract: A method in connection with continuous cooking of chips that comprises impregnating the chips with a impregnation liquid in an impregnation vessel and cooking the impregnated chips in a digester. The impregnation vessel and digester are connected to one another by means of a transfer circulation, which partly, via a feed line feeds the chips from an outlet end of the impregnation vessel to the top of the digester for separation of a free liquid in a separator. The separated liquid from the top of the digester is, partly, via a return line fed to the outlet end of the impregnation vessel for use as a transfer liqid for the impregnated chips to which cooking liquid is added to the chips at the top of the digester. Less than 100%, preferably less than 95%, and more preferred less than 90% of the liquid that is separated from the chips in the transfer circulation is recirculated to the used as transfer liquid.

Abstract: A screen apparatus of the invention is provided with a tank for receiving a papermaking material; a screen situated inside the tank for dividing the tank into a first chamber and a second chamber to separate a foreign substance from the papermaking material; a first supply passage for supplying the papermaking material into the tank; a second supply passage for supplying the papermaking material into the tank; a stirring member disposed between an inner wall of the tank and the screen to stir the papermaking material introduced in the first chamber; a screened papermaking material discharge passage communicating with the second chamber for discharging a screened papermaking material outside the tank; and a foreign substance discharge passage communicating with the first chamber for discharging a foreign substance outside the tank.

Abstract: A filtering device includes a cylindrical screen 2 having a rotatable backwash tube 3 provided coaxially therein. The backwash tube includes a first end portion including an inlet 3c for introducing filtered liquid and a second end portion including an opening 3d for discharging filtered liquid and introducing backwash water. A plurality of backwash water injection holes 13d are formed along the backwash tube in an axial direction thereof at a predetermined interval. A check valve 14 is disposed within the backwash tube adjacent the inlet 3c such that in a filtration operation filtered liquid is allowed to flow from the inlet 3c into the backwash tube 3 and then into the liquid transfer tube 9. In a backwash operation, the check valve prohibits backwash water from flowing to the inlet from the backwash tube.

Abstract: A filtration system for concentrating radioactive debris particulate provides efficient filtration, concentration and transport to collection canisters of radioactive particles from a refueling cavity, spent fuel pool, or other water volume where small particles must be removed from the water. The system includes a flushing pump module that draws contaminated water from a cut zone enclosure. The flushing pump module has a separator that removes large size particulate from the contaminated water. A solid media filter module receives the contaminated water from the flushing pump module and removes medium size particulate from the contaminated water. The solid media filter module has a structure for ejecting the medium size particulate and passing the ejected particulate to a concentrate handling module having a purge tank and a slurry transfer pump. A disposal canister station receives the medium size particulate from the slurry transfer pump and fills disposal canisters for transport and storage.

Abstract: A filtration apparatus for separating and/or enriching dissolved substances from a suspension or suspensions having at least one filter means through which flow takes place, there being arranged on the retentate side of the filter means a means for producing a shear field which produces a virtually homogeneous shear field and pressure gradient across the inflow cross-section of the filter means. The means for producing the shear field may be formed by a rotationally symmetrical rotor. There may be used as filter means matrices that are suitable for the adsorption of the dissolved substances to be separated off. There come into consideration for that purpose surface-modified membranes, for example affinity membranes. The filter apparatus may be one-tier, two-tier or multi-tier.

Abstract: A filter unit for filtering pressurized liquid carrying solid contaminants, comprising a housing having a cavity, an unfiltered liquid inlet port, and a filtered liquid outlet port. The filter unit also has a filter element having a generally cylindrical shape positioned within the housing, an interior, and a porous filter sleeve having an exterior face, the interior of said filter element in fluid communication with the filtered liquid outlet port and the exterior face of the sleeve of said filter element in fluid communication with the unfiltered liquid, so that, in operation, unfiltered liquid carrying solid contaminants flows into the cavity of the housing through the unfiltered liquid inlet port, the filter element filters the solid contaminants from the liquid, and the filtered liquid passes through the sleeve of the filter element to the interior thereof before exiting the filter unit via the filtered liquid outlet port.

Abstract: A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time achieve very good pulp properties. The digesting process includes a top separator that separates the transport liquid from the fiber material and permits the fiber material to be exposed to the cooking liquid.

Abstract: A casing has a pulp slurry inlet, a reject outlet and an accept stock outlet and accommodates a rotor. The rotor has a hollow cylinder with scraper blades at its outer periphery. A screen plate is disposed outside of the scraper blades to provide between them a passage facing to the screen plate. The hollow cylinder is formed with pulp slurry outlets. Rotation of the hollow cylinder causes the pulp slurry to be circulated outside and inside of the hollow cylinder, so that separation of the pulp slurry into accept stock and reject is repeatedly carried out by the screen plate.

Abstract: A raked bar screen for a storm overflow comprises a grid of parallel spaced-apart bars (1) attached at their ends to a framework (2,3,14). A comb assembly (4,5,6) has teeth (5) which engage in the spaces between the grid bars (1). The comb assembly is longitudinally reciprocable, whereby the comb teeth can sweep longitudinally back and forth between the grid bars. The grid bars are shaped to provide a straight central portion (10) and longitudinal end portions (11, 12) which are angled in relation to the straight portion. In use, sweeping of the comb teeth between the grid bars at the angled end portions drives out entrapped solid matter.

Abstract: There is provided a guide roller assembly for use in a wastewater treatment facility comprising a pin and a guide roller, wherein the guide roller directly surrounds the pin and the pin rotates within the roller. There is also provided a guide roller assembly for use in a cog rake bar screen comprising a pin and a guide roller, the guide roller surrounding the pin, wherein the guide roller comprises a low-friction polymeric material and the pin rotates within the guide roller, the guide roller being free to rotate.

Abstract: A commercial warewashing system has three sections, a pre-wash section, a power wash section and a final rinse section. The pre-wash section includes a sump. A perforated plate is placed in the pre-wash section over the sump. The plate receives and transfers water and gross garbage to a perforated trough secured to the side of the pre-wash section. Below the trough is a sink which communicates with the sump. The water flows into the sink and then into the sump. The gross garbage is retained in the trough. A spiral drive in the trough moves the gross garbage from the trough to a discharge end where it is removed.

Abstract: A filtering device includes a screen including support rods extending in the axial direction of the screen and arranged generally cylindrically with a predetermined interval, and a cylindrical filter member attached fixedly on the outside of the support rods, a vibrator including a shaft provided in the central portion of the screen coaxially with the screen and at least one leaf spring which is fixed in one end portion thereof to the shaft and is capable of abutting in the other end portion against a part of each of the support rods, and a drive unit for rotating at least one of the screen and the vibrator.

Abstract: There is provided a guide track for cog rake bar screens comprising a metallic or nonmetallic guide track. There is also provided a guide track for cog rake bar screens comprising modular sections of guide track being disposed adjacent one another wherein guide rollers are guided within the guide track.

Abstract: A diaphragm-type control valve for irrigation systems has an outer clam-shell housing that encloses a vertically reciprocable diaphragm assembly. A primary valve seat inside the housing is engaged and disengaged by a seal on the underside of the diaphragm to open and close the valve by connecting and disconnecting its inlet and outlet passages. Pressurized water from a lower inlet chamber of the valve travels through a small metering orifice in the center of the diaphragm assembly to an upper pressure control chamber above a flexible membrane of the diaphragm assembly. A solenoid actuated pilot valve is operatively coupled to the upper pressure control chamber for venting pressurized water therefrom to permit the diaphragm assembly to move upwardly to open the valve. A filter screen is mounted to the underside of the diaphragm assembly to prevent debris from clogging the metering orifice, clogging the small passages of the pilot valve, or fouling the solenoid.

Abstract: An endless screen lifts fecal matter and sewer influent debris from an influent channel. The endless screen is powered by an externally positioned air cylinder driving a pawl and rachet to move the screen in an elliptical path. A tank positioned below a top drop point for the screen receives the fecal matter and debris. A paddle mixer breaks up the fecal matter for return to the sewer channel and a conveyor picks up the debris and deposits it in a landfill receptacle.

Abstract: A rectangular clarifying tank has an inclined beach formed of sheet metal and having 575 holes per square inch, each hole having a diameter of 20 thousandths of an inch. Two side chain drives advance several scrapers along the beach. Each scraper has a rotatable knurled pipe which turns the sludge and aids dewatering through the beach. The sludge removed from the clarifier has a solids content of between eight and twelve percent. Additional dewatering may be accomplished by applying a vacuum to the last one-quarter of the beach. A tray positioned beneath the beach collects water which drains through the beach. The drain water may be returned to the clarifier tank or may be directly treated as clarified water.

Abstract: A cleaning device for moving debris adjacent a trash rack, the device having a mounting base for mounting the device adjacent the trash rack and a longitudinally extending arm having a first end and a distal end, the arm being capable of being driven in a direction generally parallel to the longitudinal axis of the arm, a debris collecting assembly located at the arm distal end, the debris collecting assembly comprising a fixed jaw mounted on the arm and a mobile jaw moveably connected to the fixed jaw by a jaw connecting structure to allow the mobile arm to both pivot and move inwardly with respect to the fixed jaw.

Abstract: A compact and easily cleanable device for separating solids from a stream of liquid entering the device includes a hollow base having a screen positioned spatially above the bottom of the base and tilted forwardly and downwardly to define a plane which is recessed from an opening in the base which is generally parallel to the screen. A cover is hingedly mounted adjacent the top of the device and includes a motor centrally positioned externally thereon having a drive shaft extending through the cover to the interior side thereof. A pair of wiper blades are rotatably driven on the shaft and are positioned between the interior of the cover and the screen so as to have an edge of the wiper blade rotatably movable on the screen for moving solids collected on the screen around the output shaft and upwardly toward a cutout adjacent the top of the shaft where the solids may exit the device.

Abstract: A filter for separation of a liquid from a solid has a turbine surrounded by an elongated filter body and forms a short first stage with short-pitch blades, providing a high axial impulse and low radial impulse, followed by a long second stage with long-pitch blades providing primarily radial displacement. Water vapor can be injected to promote juice extraction and is fed axially into the shaft and emerges from outlets therealong.

Abstract: Apparatus for separating light impurities from a pulp suspension is disclosed. The apparatus includes a housing mounted on a fractionation device and symmetrically disposed with respect to the axis of rotation of the casing of the fractionation device, a passageway extending between the housing and the casing, and in which the top of the housing includes an outlet for the light impurities and a dilution liquid inlet for injecting dilution liquid tangentially into the housing.

Abstract: Materials including suspended particles are brought together and then separated into two streams one of which only contains the particles, the output streams having different composition from inlet streams. Separation is effected in filtration modules which include a moving runner with wall conditioning elements which dislodge accumulated particles from porous walls of filters.

Abstract: A device for filtering fluid includes a hollow housing (10) having a fluid inlet (26) and a fluid outlet (28). A filter element (50) formed of fluid permeable material is disposed within the housing (10) for filtering fluid entering the fluid inlet (26), the fluid passing through the element (50) and out the fluid outlet (28). The element has a generally cylindrical configuration with the permeable material forming a plurality of elongated, radially extending pleats (98). The pleats are supported by spacers (81) having a plurality of blades (102) attached to a web (106) with channels (104) therebetween. The element (50) is used as a septum for supporting a diatomaceous earth precoat. A regeneration piston (76) creates fluid flows within the filter that cause the element (50) to flutter, thereby displacing the diatomaceous earth precoat from the septum for regeneration.

Abstract: The invention pertains to a tube filter device for the filtration of beer.In order to ensure a dependable, simple, time-saving and water-saving purification in a device of this kind, there is an inlet line underneath the tube filter with at least one rotary spray arm having upward directed spray nozzles, wherein the spray nozzles are arranged so that they generate concentric spray circles upon rotation of the spray arm, said circles are located essentially between the tube filters, and that also a drive unit is provided for rotating the spray arms.

Abstract: A fluid filter comprising a housing defining a fluid inlet and a fluid outlet, a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis, and backflushing means for removing filtered out sediment from the filter element comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head.

Abstract: A process and device for the filtration of solid-liquid mixtures, in particular, solid-liquid suspensions with readily sedimenting substances, uses a filtration device such as a rotary filter optionally operating at an overpressure and in a pressure vessel. The process primarily comprises producing a movement in addition to the natural or usual filtration movement of the or in the mixture. Conveniently, a filtration device and, in particular, with rotary filters in a pressure vessel, includes a partly open feeding device, in particular, a feeding pipe for the supply of mixture or suspension, and a device for additionally influencing the natural or usual filtration movement of or in the mixture or suspension for generating an additional flow of the mixture.

Abstract: A screw press separator is provided herein for separating and deliquifying a slurry of solids and liquids e.g., a slurry of manure and water, or any other slurry of similar physical characteristics. The separator includes a cylindrical housing having a slurry inflow port. A cylindrical strainer basket extends rearwardly from the housing for the passage of separated liquid therethrough. A cylindrical discharge chamber extends rearwardly from the outlet end of the strainer basket to define a solids discharge opening. A motor driven auger is disposed within the housing and the strainer basket, the auger including a shaft extending through the housing, through the strainer basket and through the cylindrical discharge chamber, for driving the auger for advancing the slurry rearwardly within the cylindrical housing. A spring-loaded door assembly which is connected to the shaft, is provided at the exit of the cylindrical discharge chamber.

Abstract: A filter assembly has a cylindrical filter element immersed in the fluid to be filtered, and which fluid normally flows radially inwards through the filter element and is thereby filtered. When the filter element is to be cleaned by backflushing, fluid flowing inwardly through the filter element is impelled by a rotating pump vane which directs fluid within the filter element outwardly at relatively high through the filter element thereby dislodging debris which may have adhered to the exterior of the filter element.

Abstract: A strainer for filtering a pumped fluid has a strainer body having a wall provided with fluid inlet perforations in an outer surface, a surface cleaning scraper or brush in juxtaposition with the outer surface, and a drive operatively connected to the surface cleaner for moving the surface cleaner over the outer surface for removing accumulated debris. At least one nozzle is oriented towards the cleaned outer surface of the strainer body for directing a jet of liquid against the perforations to assure that the perforations are clear. The strainer is thus self-cleaned continuously without requiring a back wash operation, allowing continuous flow through the strainer.

Abstract: A water filter having a strainer mounted on the inside for straining water, and a reciprocating device controlled by a pressure differential controller to reciprocate a disk-like scraper in the strainer, causing it to scrape out dirt from the strainer, the disk-like scraper having a center water hole and a check valve mounted in the center water hole for permitting water to flow downwards in the strainer through the center water hole and stopping water from flowing upwards in the strainer through the center water hole.

Abstract: A burden removal system for removing solid burden from a stream of water. A screen has an upper and a lower surface with pores extending between them. The upper surface is substantially horizontal. A drive bar with a wiper bade is cyclically bi-directionally driven with the blade pushing burden along the upper surface in one direction and rising above the burden in the opposite direction. Jet sprays discharge water against the lower surface, preferably just ahead of the wiper blade to assist the blade in moving the burden and cleaning the pores.

Abstract: A device for removing material screened or filtered out of a liquid flowing in a channel (3), especially in waste water treatment plants, is described. The device comprises an unpowered cylindrical grating surface (8) being immersed partly in the liquid and being formed by a plurality of substantially semicircular grating bars (10) located with distance to each other. The device further comprises a removing beam (12) rotatably driven about the axis (2) of the grating surface (8) and having removing elements (15) extending between the grating bars (10) from the inside of the cylinder to the outside. A conveying device (17) for the material is provided which is positioned with respect to the grating surface (8) and leads to a point outside the liquid in the channel (3), the device having a tube-like housing (22) with an opening (23) for the entry of the material and a driven screw (20) inside the housing (22).

Abstract: A mechanically raked screen system is used for preliminary waste water treatment. A screen is formed of a multiplicity of mutually parallel screen bars. The screen bars are oriented substantially transversely relative to a flow direction of a flowing liquid and forming screen spaces of a given width therebetween. A rake assembly rakes the screenings from the screen. The rake assembly includes two endless chains which traveling about sprocket wheels disposed laterally of the screen, and a rake attached to and extending between the chains. The rake is oriented substantially perpendicularly to the screen and travels with the chains for repeatedly raking the screen. The tynes of the rake are integrally formed from a single metal piece together with the rake plate. The vertical screen bars have a trapezoidal cross section, such that the leading side facing against the flow of the waste water is about twice as wide as the trailing side.

Abstract: A filter unit for fluids, the filter unit comprising a filter housing with at least one filter disposed therein, at least one fluid feed line, at least one purified fluid outlet line, and at least one unpurified fluid outlet line, each of which lines is provided with a valve. The filter is sealingly seated in the filter housing in an area between the fluid feed line and the purified fluid outlet line. The filter is in the form of a conical cylinder. The wide opening of the filter faces toward the fluid feed line and the underside of the filter forms a narrower opening sealingly disposed in an intermediate plate in the filter housing. A dirt funnel is disposed below the intermediate plate. A cleaning element is rotatably seated inside the filter housing which can be lowered into the filter from a filtration position into a cleaning position.

Abstract: Materials including suspended particles are brought together and then separated into two streams one of which only contains the particles, the output streams having different composition from inlet streams. Separation is effected in filtration modules which include a moving runner with wall conditioning elements which dislodge accumulated particles from porous walls of filters.

Abstract: An apparatus and method for separating an effluent into a filtered liquid component and a concentrated sludge component are described. A screen for filtering the effluent is positioned to divide a chamber into two compartments, one for concentrating sludge and one for receiving filtered liquid. The screen is curved in an arc that extends away from the liquid outlet, and a spray arm is mounted for arcuate motion to conform to the curvature of the screen to dispense a fluid against the screen to dislodge attached sludge, to unclog the screen apertures.

Abstract: In an apparatus for separating off the liquid portion from the solid portion of two-phase systems, in particular ceramic slips, having a screw and having filter surrounding the screw, a two-stage construction of the apparatus is realized by a first filter and a second filter section.

Abstract: A fish-excluding, self cleaning screen forming at least part of the boundary between a body of water such as a stream, and a bay from which water is to be withdrawn. On the bay side of the screen is a hub with a plurality of rotating wands that discharge water against the bay side of the screen to flush screen apertures and provide a periodic variation in flow through the screen to discourage passage of fish. Optional brushes may periodically brush the bay side of the screen to assist in cleaning the apertures.

Abstract: A filter apparatus for thermoplastic synthetic plastics material melts comprises a housing (2) in which two filter disks (5,6) are disposed in parallel to each other and spaced apart from each other. The melt to be filtered is supplied to these filter disks (5,6) via an upstream channel (19). The impurities gathering on the upstream side of the filter disks (5,6) are continuously scraped off by a scraper (8) that carries a plurality of scraper elements (10) disposed along curved lines spaced apart from each other so that they convey the impurities towards the center of the filter disks (5,6). There, the impurities reach a conveyance channel (22) in which they are conveyed off by at least one worm (23,24).

Abstract: A pressure filter has a fluid compartment with a fluid inlet and at least one filter surface in the fluid compartment having a plurality of apertures, one side of the filter surface bounding the fluid compartment and the other side thereof bounding a filtrate compartment having a filtrate outlet. The backwashing system includes a backwashing head sweeping over the filter surface and sealing a part thereof with respect to the fluid compartment. The backwashing head restricts a backwashing compartment having at least one suction chamber open in a slot-like manner to the filter surface and having connected thereto a reject drain. The filter includes two filter surfaces located in the front side range of a hub. The hollow shaft is rotatably supported within the hub. The hollow shaft is coupled at its front sides to a respective backwashing head and at its cylindrical part to a drive means located outside of the fluid compartment.

Abstract: Apparatus for partial dewatering of raw sludge, includes at least two filter units each defining a filter chamber which receives raw sludge and has an outer wall surface formed as filter for discharge of filtrate from raw sludge. Accommodated within the filter chamber is a double-acting plunger which extends across the entire cross section for dividing the filter chamber in two working chambers, and reciprocates in the filter chamber along the inside wall surface for movement between a first end position and a second end position, with each working chamber having an inlet for receiving raw sludge from a suitable conveying unit and an outlet for discharge of partially dewatered raw sludge.

Abstract: Pressure sorter for the preparation of fiber suspensions obtained from waste paper, with a screen surrounding a rotor, a supply chamber between rotor circumference and screen as well an accepts chamber outside the screen and with profiled elements provided at the circumferential surface of the rotor for generating positive and negative pressure pulses, whereby in order to achieve good sorting results as well as a long service life of the screen, a rotor peripheral surface sector is provided between two profiled elements following one another in circumferential direction of the rotor, in every axial section of the circumferential surface of the rotor acting on the screen, this rotor peripheral surface sector being part of a peripheral surface area parallel to the screen inlet side, wherein--measured in circumferential direction of the rotor--the length of each profiled element is at least approximately equal to the length of the following rotor peripheral surface sector, the length of the latter, however, bein

Abstract: A liquid recycling and filtering system is well suited for use in continuous flow recycling surface cleaning devices. The system employs a canister containing a liquid cleaning solution, and a cylindrical filter submerged in the liquid and defining a chamber containing a portion of the liquid. A liquid supply conduit withdraws liquid from the chamber and supplies the liquid to a cleaning tool head, where the liquid is sprayed upon a floor or other surface being cleaned. A counterflow conduit is coupled to the liquid supply conduit and to the chamber, for transporting liquid under pressure to a spraying assembly within the chamber. The spraying assembly includes a rotatable manifold and nozzles at opposite ends of the manifold. The nozzles spray the liquid in planar, fan-shaped patterns that impinge upon the filter over limited surface areas.

Abstract: Described is a pressure filter comprising a fluid compartment with a fluid inlet, at least one filter surface in the fluid compartment having a plurality of apertures, one side of the filter surface being restricted by the fluid compartment and the other side thereof being restricted by a filtrate compartment having a filtrate outlet, and a backwashing means. The backwashing means includes a backwashing head sweeping over the filter surface and sealing a part thereof with respect to the fluid compartment. It restricts a backwashing compartment having at least one suction chamber open in a slot-like manner to the filter surface and having connected thereto a reject drain. The slot-like aperture of the suction chamber is formed in such a manner that each aperture of the filter surface, independent of its radial position, is swept over by the slot-like aperture approximately in the same space of time. Accordingly, a uniform cleaning process of the filter surface by the backwashing head results.

Abstract: A food soil handing system for a dishwasher is provided. A main carrier arm has two driver arms rotatably mounted thereon. Each driver arm turns a driver gear engaged with a stationary ring gear. Rotation of the driver arms results in rotation of the main carrier arm, providing significant torque. The main carrier arm is disposed above a drain plate having perforations to drain wash water. A pair of resilient wipers are secured to the main carrier arm to wipe across the plate as the carrier arm rotates. The wipers mash soft food particles through the perforations. Hard items are either swept around or passed over by the wipers for later retrieval.

Abstract: A screw conveyor including a feed screw formed, at least partially, as a shankless screw, a jacket surrounding the feed screw and a brush cooperating with the inner surface of the jacket for cleaning the same, with the feed screw including a plurality of substantially band-shaped screw threads extending along an imaginary helical line and arranged, when viewed in a transporting direction, one behind the other with an ever increasing distance from a screw axis so that each two adjacent screw threads form a step therebetween, and with the brush being arranged on the step formed by two outmost screw threads.

Abstract: A self-cleaning pressure filter system comprises a housing having an unfiltered liquid inlet and a filtered liquid outlet, a filter element of substantially constant cross section having an interior communicating with the unfiltered liquid inlet and an exterior communicating with the filtered liquid outlet for filtering solids from the liquid and wherein filtered out solids are left in the interior of the filtered element. A cleaning unit is simultaneously moved both axially and rotatively along the interior of the filter element and carries at least one cleaning blade movable in a spiral path along the interior face of the filter element for removing solids accumulated thereon.

Abstract: A pressure sorter for fiber suspensions, and a process for the preparation of fiber suspensions, are disclosed wherein a rotor is disposed concentrically within a cylindrical screen that has spaced circumferential rows of narrow through slots through which a portion of the fiber suspension fed into the screen passes radially outward to an accepts chamber external to the screen. The fraction of the suspension which does not pass through the screening slots passes axially out of the screen cylinder as a "rejects" flow. V-shaped grooves around the inflow ends of the screening slots create turbulences in the adjacent suspension material. The rotor includes external profiled elements which generate positive and negative pressure pulses at the adjacent inflow side of the screen as the rotor is rotated.

Abstract: The apparatus transforms animal waste produced during husbandry activities into useful materials such as organic-based manure and/or fertilizer to thereby mitigate the pollution problems associated with husbandry activities. A base part of the apparatus includes an endless conveyor having a filter in the form of an endless loop. A liquid-collection receptacle is interposed between the upper and lower runs of the filter so as to collect liquid filtrate from the waste material. A first hopper is located beneath one end of the endless loop so as to collect the solid content of the waste conveyed along the upper run of the filter. A second hopper is provided to accommodate material to be added to the solid content of the waste. The materials are fed from the respective hoppers into a mixing chamber whereupon they are mixed by a mixer. The base part of the apparatus is connected to a closed system of treatment tanks.