Abstract: The invention is relative to a device for dehydrating sludge such as occurs in sewage treatment plants in the form of dilute sludge. The receptacle for the sludge contains a sieve surface comprising openings for the passage of liquid. The sieve surface, for its part, is substantially circular can be rotated about an axis (21) running vertically to the sieve surface. The axis (21) of the sieve surface (2) is inclined relative to a horizontal line and is caused to rotate by a drive device (3). The disk-shaped sieve surface (2) is arranged in a container (11) comprising a bottom (13) and a side wall (12) through which side wall a supply line (4) for the sludge and an outlet (41) for the separated water run.

Abstract: The filter has a framework with an inlet end, a solids outlet end and an outlet for a separated product between the ends. A fabric filter extends in the framework from end to end and is supported by movable rings, resilient members and dampers enabling axial extension and contraction of the filter. The resilient members, rings and dampers form a unit removable from the framework. A propeller turbine extends through the filter and is supported at opposite ends, and a drive is coupled with the turbine at the one end of the framework. A quick assembly/disassembly mechanism with a rail extends along the framework and is engageable with its cap for removing same and affording access to the unit enabling withdrawal of the unit from said framework and reinsertion of a filter unit composed of a filter and respective movable rings, resilient members and dampers.

Abstract: A self-cleaning water filter, coupled to a water flow having particulates therein, that includes a pair of canisters, each having a cylindrical wedge wire water filter screen. An elongated brush running the length of the screen is disposed between two confining walls also running the length of the screen to form a chamber. A elongated partition, including two sets of apertures, is used, along with the elongated brush, to divide the chamber into two particulate dislodge chambers and a drain subchamber. A drain is in fluid communication with the drain subchamber. During cleaning, the drain is opened and the screen is rotated against the brush for liberating the particulate contaminants and a limited amount of the water flow into the two dislodge subchambers. The particulate contaminants and the limited amount of water then pass through the apertures at a high velocity and into the drain subchamber which exits through the drain.

Abstract: This invention relates to a backflushing filter, particularly for filtering lubricating oil. Filter candles 22 which are open at both ends 24, 34 are disposed around a rotary shaft 1 in the filter housing 11, 12, the interior space of which filter candles can be acted upon in filtration operation by a sludge which flows into the backflushing filter 10. A cleaning device is moved in conjunction by means of the rotary shaft 1, and comprises an upper flushing cock 27 and a lower flushing cock, which communicate with an outflow valve via the rotary shaft 1, for cleaning the filter candles 22′ during a backflushing operation. The upper flushing cock 27 is offset by an angle in the direction of rotation in relation to the lower flushing cock 37.

Abstract: A fine solids separator 10 including a hollow housing 12 having a generally cylindrical wall 11. Located within the housing 12 is a cylindrical screen member 15 that is preferably formed of expanded metal mesh. The screen member 15 encloses a chamber 22 to which a flocculated sewage is delivered by means of an inlet duct 23. Located within the chamber 22 is an impeller 26 which at least aids circulation of liquid within the chamber 22 about the longitudinal axis of the chamber 22. Liquid leaves the chamber 22 via the screen member 15 and an outlet 25 extending from an outlet chamber 24 located between the member 15 and housing 12.

Abstract: A self-cleaning water filter, coupled to a water flow having particulates therein, that includes a pair of canisters, each having a cylindrical wedge wire water filter screen. An elongated brush running the length of the screen is disposed between two confining walls also running the length of the screen to form a chamber. A elongated partition, including two sets of apertures, is used, along with the elongated brush, to divide the chamber into two particulate dislodge chambers and a drain subchamber. A drain is in fluid communication with the drain subchamber. During cleaning, the drain is opened and the screen is rotated against the brush for liberating the particulate contaminants and a limited amount of the water flow into the two dislodge subchambers. The particulate contaminants and the limited amount of water then pass through the apertures at a high velocity and into the drain subchamber which exits through the drain.

Abstract: The aim of the invention is to improve the backwashing action of a backwashable filter for liquids comprising the following: a filter body which is located in a housing and which separates an incoming flow chamber from an outgoing flow chamber and a backwashing channel which lies adjacent to the filter body, is situated in the outgoing flow chamber and has a backwashing opening that faces towards the filter body, said backwashing channel also communicating with a source of a cleaning medium and said cleaning medium being subjected to pressure in the backwashing channel, and the filter body and the backwashing channel being moveable in relation to each other. To this end, the filter body has links on a side facing towards the backwashing channel which are set apart from each other in the direction of motion.

Abstract: The present invention relates to a rotating device for continuously filtering a liquid such as a solution containing a precipitate.

Abstract: An apparatus for cleaning a rotating cylindrical wastewater screen of the type formed of tubular perforate wedgewire.

Abstract: A vortex mechanical power filter includes a filter unit 12 arranged within a vortex tank 10 such that water to be filtered, e.g. flowing from a from a fish pond via gravity supply line 22, impinges upon a side of the filter unit at an angle to cause rotation thereof. The filter unit can also include a polyurethane ring float 121 so that the filter unit is self-adjusting within the vortex tank. Within the filter unit, a vortex disrupter 20 can be provided to aid in rotation thereof. As the system operates, a water jet assembly 18 sprays a plurality of water jets onto the filter screen to gently clean waste therefrom so that filtered water can be continuously provided.

Abstract: A filter system (10) comprising a filter medium (11) for filtering contaminants from a process fluid, having a filtration side on which contaminants collect and a filtrate side from which filtrate flows; a counter-flow generator (20) located on the filtrate side that directs a localized stream of counter-flow fluid (23) from the filtrate side to the filtration side of the filter medium (11) to thereby dislodge the contaminants from the filtration side of the filter medium (11), wherein the localized stream (23) traverses a substantial proportion of the filter medium (11). The filter system (10) optionally further comprises a clearing-flow generator (30) or like means located on the filtration side of the filter medium (11) which clears contaminants from the filter medium (11).

Abstract: A strainer for immersion in liquid, especially shallow water, to prevent debris from entering a pump connected by a suction pipe to the interior of the strainer. The strainer has a cylindrical housing that is closed at the bottom and covered by a circular screen at the top. As the pump sucks water, the screen prevents debris from being sucked into the strainer interior along with the water. Debris drawn against the screen's exterior is dislodged by a rotating spray arm that contains nozzles and is disposed within the strainer interior to spray water against the screen. The water is fed under pressure to the spray arm through a separate supply line tapped into the pump's outlet. The spray arm nozzles are aimed to direct water generally upward through the screen to dislodge the debris and to cause the spray arm to rotate. Hence, as the spray arm spins, the water washes substantially the full face of the screen.

Abstract: A filter cloth comprising at least a base layer and a filtering layer, characterized in that the ratio T/L of the thickness (T) of the filtering layer to the length (L) of fibers of fiber bundles constituting the filtering layer is 0.02 to 0.7 and the sum of a projected area of the fibers onto the base layer surface is 8 to 350 times the area of the base layer surface and, a filter cloth characterized in being constituted with at least a base layer and a filtering layer mainly composed of fiber bundles of crimped fiber ratio over 5%.

Abstract: A system for pumping effluent out of a septic tank contains an electric pump unit disposed coaxially within a tube. A rotary self-cleaning strainer has a cylindrical filter screen that filters certain solid material from the effluent flow through the tube upstream of the pump inlet port. Effluent is conveyed out of the septic tank through a pipe connected to the pump outlet port. A portion of the pumped effluent is conveyed to one or more nozzles arranged to wash the filter screen. In certain embodiments, the cylindrical screen is stationary and the nozzles rotate, while in other embodiments, the nozzles are stationary and the screen rotates. Depending on particular embodiment, the nozzles may be either inside or outside the screen. Effluent flow through the screen is opposite the direction of spray from the nozzles.

Abstract: A method and apparatus for efficiently separating solids from liquid/solid slurries are disclosed. The slurry to be separated is retainably placed within a container having one or more lift paddles secured within its inner cavity. The container is supported for rotation about an axis and has drive means for slowly rotating the container. As the container rotates, the lift paddles lift a portion of the retained slurry, allowing the liquid portion to fall back into the primary slurry pool to be separated, and lifting coarse solids toward the top of the rotation path of the paddles. The separated solids slide by gravity from the lift paddles as they approach the top of their rotation paths and into a collection tray. A filter that rotates with the container filters fine solids from the liquid portion of the slurry and also deposits the fine solids on the collection tray. The filtered liquids can be readily pumped from or recirculated to the separator.

Abstract: An endless media filtration system includes a housing with a pool forming assembly mounted between a pair of side walls. The pool forming assembly includes a central shaft with two spaced-apart containment discs rotatably mounted on the shaft between the side walls. An endless loop filter media belt is supported on an endless loop carrier belt and includes an upper run which is pressed against the peripheral edges of the discs to form a generally semicircular shaped pool along bottom arcs of the discs. A separation pan is located between upper and lower runs of the carrier belt to direct filtered liquid to one side of the carrier belt and out the bottom of the housing. A backwash assembly includes a first spray rod spraying air through the filter media, a second spray rod spraying water through the filter media, and a third spray rod spraying air through the filter media after the filter media has passed under the second spray rod.

Abstract: A drum filter comprises a pair of circular disks connected in coaxial relation by a plurality of axially extending disc support rods. A cylindrical filter media is disposed between the disc support rods. Unfiltered liquid is admitted to the interior of the drum filter and flows radially outwardly therefrom through the filter media. Reciprocating backwash nozzles direct high pressure liquid radially inwardly against the exterior surface of the filter media to backwash contaminants collected on the radially inner surface thereof into a contaminant collector disposed internally of the filter drum. The filter media is sealably connected to the circular disks by a novel retention system.

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 reciprocating power sprayer for cleaning a rotating cylindrical wastewater screen of the type formed of tubular perforate wedgewire. The spray is reciprocated on an elongated pneumatic cylinder which is arranged in parallelism along the cylinder wastewater screen. Controls are provided for automatically controlling the reciprocation of the spray.

Abstract: A self-cleaning fuel oil strainer, coupled to a continuous fuel flow, that includes a pair of canisters, each having a cylindrical wedge wire fuel oil filter screen. An elongated brush running the length of the screen is disposed between two confining walls also running the length of the screen to form a chamber. A elongated partition, including two sets of apertures, is used, along with the elongated brush, to divide the chamber into two particulate dislodge chambers and a drain subchamber. A drain is in fluid communication with the drain subchamber. During cleaning, the drain is opened and the screen is rotated against the brush for liberating the particulate contaminants and a limited amount of fuel oil into the two dislodge subchambers. The particulate contaminants and the limited amount of fuel oil then pass through the apertures at a high velocity and into the drain subchamber which exits through the drain.

Abstract: A filtration apparatus designed to remove solid contaminants from a liquid includes an endless filtration belt located in a liquid tank, so that liquid flows through minute openings in the belt into a liquid collection box located within the belt envelope. Edge areas of the belt are engaged with annular support walls carried by the tank side walls, such that a continuous seal is provided against migration of contaminants around the belt side edges. Contaminants collecting on the belt surface can be periodically removed by moving the belt across a spray system that dislodges the contaminants from the belt into the tank. A drag conveyor removes contaminants from the tank.

Abstract: A carrier-separating and liquid-collecting mechanism in a liquid-waste treatment apparatus having a treatment tank in which carriers having microorganisms immobilized thereon are suspended. The carrier-separating and liquid-collecting mechanism includes a cylindrical screen (13) and a liquid-collecting devices (14) disposed in the cylindrical screen. The cylindrical screen is provided in the treatment tank, such that the axis of the cylindrical screen extends in a substantially horizontal direction. The liquid-collecting device is a pipe or a gutter having liquid-collecting holes, and is capable of collecting liquid at a plurality of positions through the cylindrical screen. The carrier-separating and liquid-collecting mechanism may further include a rotation mechanism for supporting the cylindrical screen and intermittently rotating the cylindrical screen on the axis thereof and a brush (18) which is fixed so as to be in parallel to the cylindrical screen in contact with the cylindrical screen.

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 novel all-wheel journaling of the rotary portion of a rotary self-cleaning strainer on a stationary central core. Respective sets of circumferentially spaced wheels are provided on respective end closures of the rotary portion that close opposite axial ends of a strainer screen to the central core. A first set of wheels on one end closure rides on a wear sleeve around the suction pipe of the stationary core, and a second set on the other end closure rides on a ring disposed around the supply pipe of the stationary core. Two additional rings sandwich the ring on the supply pipe to axially capture the second set of wheels and thereby axially capture the rotary portion on the central core. The rotary portion has a frame, including the end closures, for supporting the screen. Novel tie rod structures extend between the end closures.

Abstract: A filter includes, in a filter body, a filter unit in the general form of a wheel with, for local contraflow circulation of a cleaning fluid through its filter element, a circulation unit to which a pipe is connected. The pipe is an inlet pipe of the cleaning fluid and, on the other side of the filter unit to the circulation unit there is locally interposed in the filter body an interceptor plate, with, connected laterally to the filter body, between the filter element of the filter unit and the interceptor plate, a pipe which is an outlet pipe for the cleaning fluid. Applications include heat exchangers in which solid cleaning elements circulate, for retaining and recycling the latter.

Abstract: A medium is separated into a solids-containing component and a liquid component. The latter flows through a filter. Clogging of the filter is avoided in that the latter is moved relative to the medium perpendicularly to the flow direction of the liquid through the filter element. At the same time, the medium is agitated.

Abstract: A process and apparaus for recovery water from raw sewage extracted directly from the sewer including a screen(2) operable to obtain from raw sewage a screened effluent having a maximum particle size of no more than 900 microns. The apparatus also comprises a first membrane separator(5) which is operable to filter the suspended solids from some or all of the screened effluent. The process also includes a second membrane separator preferably in the form of reverse osmosis filter(8).

Abstract: The present invention is directed to a filter apparatus for filtering out suspended solids from liquid that is passed through filter material supported within a tank. The invention is also directed to a method of cleaning the filter material while the filter material remains inside the tank. The disclosed apparatus and method facilitates the removal of solids which are deposited on the filter material during the filtering operation, as well as biogrowth and other foreign matter. The cleaning method utilizes a suction generating device, such as a pump and associated suction heads, for backwashing the filter material. The cleaning method also utilizes a device for directing a liquid stream of a chemical cleaning solution at high velocity to the filter material thereby chemically washing the filter material and dislodging filtered solids and other foreign matter therefrom.

Abstract: A filtering assembly for separating solids suspended in a solution includes a control device closing a plurality of supply devices for the solution to be filtered and for washing liquid and opening a drain valve of an outlet of the assembly in response to a critical level of accumulation of solids on a pulp detector.

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 rotating disc filter for separating coarse phase from a liquid mixture having carrier elements and blocking means that prevent the coarse phase from falling back into the pool of incoming liquid mixture. The capacity of the filter is increased by the prevention of the coarse phase from being filtered again and thereby occupying filter area.

Abstract: A filter assembly comprises a tank, a support pipe disposed at least partially inside the tank, and a filter drum disposed inside the tank, the drum being rotatably mounted to the support pipe for rotation thereabout. The drum carries a filter element and has an inner surface. A suction source communicates with the support pipe to generate an underpressure inside the drum for pulling filtrate through the filter element from the tank during rotation of the drum. A blowback pipe extends into the support pipe and is provided at one end with a pipe section traversing the support pipe and extending toward the inner surface of the drum. A shoe or valve plate having a low-friction outer surface is connected to the pipe section and is disposed between the support pipe and the inner surface of the drum. The shoe may be provided with an elongate outlet slot extending parallel to an axis of rotation of the drum.

Abstract: An apparatus for filtering liquids, such as fiber suspensions or polluted water, includes a hollow rotating filter body adapted to receive the liquid to be filtered within the body. A plurality of guide members are attached to the filter body and distributed around the latter to receive cloudy filtrate penetrating the filter body at the descending side. A basin is arranged at the descending side of the filter body to collect cloudy filtrate poured from the guide members. As a result, the cloudy filtrate is prevented from mixing with the clear filtrate.

Abstract: A screen assembly is described which comprises a flow channel along which sewage is intended to flow, in use, a continuous flexible belt entrained around roller or wheel means and projecting into the channel, and means for driving the belt. The belt is perforated such that relatively large solids carried along the flow channel in the sewage are trapped by the belt adhering thereto due to a pressure differential across the belt. Movement of the belt lifts such solids from the flow channel. The belt is of thickness less than or equal to 1 mm.

Abstract: A detergent composition and additive comprising a protease and a reversible protease inhibitor of the peptide or protein type, wherein the ratio of the dissociation constant to the protease concentration in the range from 0.006 to 6. When the protease is subtilisin, the protease inhibitor is preferably a modified subtilisin inhibitor of Family VI.

Abstract: An apparatus and method for filtering a fluid containing contaminants is provided whereby the apparatus includes an inlet for drawing fluid from a fluid source, a housing having attached thereto the inlet, a contaminant outlet, a clean outlet, a filtering assembly and a mechanism for agitating the filtering assembly. The filtering assembly has an upper or upstream end connected to the inlet and a lower or downstream end connected to the contaminant outlet. The filtering assembly is disposed within the housing and is connected to the contaminant outlet whereby fluid is introduced to the filter assembly at an upper end of the filtering assembly by the fluid inlet and whereby fluid is passed through the filtering assembly to provide clean, filtered fluid which is discharged via the clean outlet, and debris and other contaminants contained in the fluid are separated from the fluid and retained by the filtering assembly.

Abstract: A device for removing floating and suspended debris from a liquid flow passed through a liquid flow flume (3) is disclosed, the device including a separator (9) positioned within the liquid flow flume at an angle with respect to the flume and extending across the path of the liquid stream for collecting floating and suspended debris thereon. An elongated conveyor assembly (10) having an elongated tubular housing (20) with a first conveyor portion (11) and a second conveyor portion (12) is also provided as a part of the device. The first conveyor portion of the conveyor assembly is positioned within the separator and extends therefrom, the first portion of the conveyor assembly, as well as the conveyor assembly, being independently supported with respect to, and without being formed as a part of, the separator.

Abstract: A method and apparatus for filtering a liquid from a liquid/solid mixture using a centrifuge. The centrifuge has a conveyor having a hub and a flight for imparting a centrifugal motion to the liquid/solid mixture. The conveyor is rotated for imparting the centrifugal motion. A filter is carried in the tank which holds the conveyor. The filter encircles the conveyor for filtering the liquid from the liquid/solid mixture. A backwash system has a tube having a series of nozzles positioned for spraying a fluid at the filter in a narrow band which circumscribes the filter. The tubing is connected to a header which projects out of the casing through an opening. The fluid sprayed through the nozzles is pumped through the header to the tubing having the nozzles.

Abstract: A method for removing debris from a free flowing water system (100) using an improved filter apparatus (10) is described. The apparatus includes a rail (12) which is mounted adjacent the water supply intake opening (102) and a continuous belt (36) made of chain links (38) and connectors (44) which mounts around an upper sprocket cylinder (26) and a lower sprocket cylinder (32) spaced between the ends of the rail. Openings (42) in the belt collect debris from the water flowing through the belt. The connectors have lifters (50) which move the debris collected on the front side (36A) of the belt and tilt to dump any debris of excess weight back into the water system. As the belt moves upward, the debris collected on the belt and by the lifters is moved out of the water system toward the top of the rail. As the belt moves over the upper sprocket cylinder, the upper sprocket teeth (28A) extend through the openings of the belt loosening the debris trapped on the front side of the belt.

Abstract: A vibrating screen unit for dewatering dredged material. The vibrating screen unit includes a frame and a top screen deck, a middle screen deck and a bottom screen deck. The middle screen deck includes a splitter which extends across the width of the frame and comprises alternating closed channels and screen rows which alternate across the width of the frame.

Abstract: A fluid filter assembly having a body with a chamber for receiving a filter element supported by the body. At least one cleaning device is positioned adjacent the inlet side of the filter element. The cleaning device includes a hollow duct for collecting dislodged particulate matter, an adjustable scraper or brush and a deflector substantially equal in length to the scraper or brush. Nozzles may be provided for directing pressurized cleaning fluid toward the cleaning device.

Abstract: Filter for continuous filtration of liquids containing solids in a closed cylindrical vessel with a pressure difference between the liquid to be filtered and the filtrate, with disks which are formed by hollow filter sectors and supported at a distance from one another on a driven horizontal hollow shaft normal to the shaft, with filter beds on both sides of every filter sector and a hollow space located between the latter allowing the filtrate to flow out through the hollow shaft, and with devices which are movably pressed against on both sides of every filter disk for removing and discharging solids from the filter beds forming the outer sides of the filter disks and for cleaning these filter beds, wherein every device for removing and discharging solids from and cleaning the filter beds is formed by a closed hollow box unit which is completely surrounded by the liquid to be filtered and has a plurality of chambers which are separated from one another, wherein every chamber has at least one inlet gap compre

Abstract: A backwashable fluid filter formed with a filter element which is disposed so that it can be rotated about its axis inside the filter housing by a drive mechanism and through which a radial flow passes. A backwashing device is provided which includes a dirt removal channel which extends parallel to the axis of the filter element. When the filter element is backwashed, clean fluid flows back through the filter element, removes dirt particles adhering to the filter element and carries them into the dirt removal channel. In order to pre-clean the filter element, a resiliently mounted stripping device is arranged in front of the backwashing device to remove coarse dirt from the surface of the filter element before it reaches the backwashing device. The filter element is provided with slit-like openings, each of which has a substantially U-shaped configuration and defines a resilient tongue.

Abstract: An apparatus is disclosed for filtering slurries of minerals or other fine particles. The apparatus includes a filter plate having an interior porous support layer and a microporous metal filtration layer overlying the support layer, the pore sizes in the filtration layer preferably being in the range of from about 0.2 to 3 microns. The side of the filtration layer non-adjacent the support layer constitutes a filter surface for the mineral.

Abstract: A method for filtering an aqueous mineral slurry and collection of the mineral as product. The slurry is flowed through a filter plate of the type characterized by a porous support layer and an overlying microporous metal filtration layer, with flow through the filter plate during filtration being from the filtration layer side toward the base layer and being effected by establishing a fluid pressure differential across the filter plate. The filtration layer preferably comprises a sintered metal, with a relatively narrow pore size distribution, i.e. one wherein substantially all of the pores are less than 5 .mu.m.

Abstract: A novel bearing-seal for the upper journal of a rotary self-cleaning strainer allows an existing strainer whose upper journal has become too loose to be reconstructed without the necessity of replacing the suction pipe, even though the suction pipe has been grooved by a set of circumferentially spaced wheels previously used for the upper journal. The bearing-seal can also be used in a new strainer instead of such a set of wheels. Where sealing is also required, the inventive bearing-seal has a sealing disc for replacing a previously used curved lip seal. The inventive upper bearing-seal significantly reduces rotational friction, enabling the strainer to be operated with significantly increased power efficiency, offering the potential for effective usage with lower pressure suction pumps.

Abstract: A liquid-cleaning filter system with distillation capability has twin permanent filter assemblies, each utilizing a wire mesh filter cartridge which is backwashed using an internal sprayer nozzle assembly. During the normal operation of the filter cartridge, which is located in a pressurizable inverted bell housing, contaminates are filtered through a sheet of wire mesh arranged in a star configuration on a frame structure within the filter cartridge. The liquid filtering system is especially adapted for use in dry cleaning operations where a layer of diatomaceous earth and a layer of activated carbon deposited are on the wire mesh at the start of normal forward flow. Contaminates collect on this filter bed, thus cleaning the dry cleaning solvent.

Abstract: A tandem waterwheel type trommel apparatus having a laterally-disposed drain-off drum and a laterally-disposed classifying drum combined through a short pipe to form a main body, which is rotatably disposed on a base and is connected to a drive unit. A front end plate and a rear end plate each having a doughnut-like shape are respectively provided at the front and rear ends the drain-off drum. A plurality of buckets are provided in the drain-off drum, and gutters are provided on the back side of upper end portions of the buckets. The gutters communicate with drain holes formed in the rear end plate. A fixed shoot is provided which extends through the drain-off drum to the classifying drum. The classifying drum has a cylindrical portion and a truncated-cone portion. A circumferential member of truncated-cone portion is made porous while a circumferential member of the cylindrical portion is formed of a wire netting. A screw is provided on the outer circumferential surface of the cylindrical portion.

Abstract: A method for filtering and backwashing solid particles out of liquids is illustrated, with a filter drum (5) positioned completely below the liquid level (6) having a cylindrical surface (7) coated with a filter medium (8), the liquid flown through the outside of the filter drum to the inside. A backwashing device for removal of the filter cake from the filter medium is provided. At the beginning of each cycle of backwashing an air cushion (15) is introduced in the filter drum (5) and liquid in the filter drum (5) is displaced in such a manner so that liquid jets from an ejetion apparatus (19) containing a spraying head (17) and being arranged in the interior of the filter drum without being sealed on the filter drum penetrate through the air cushion (15) to the backside of the cylindrical surface (7) of the filter drum (5). The filter cake so removed from the filter drum is withrawn at the outside of filter drum (5) in a stream of liquid.

Abstract: A method and apparatus for fibrous suspensions in the wood processing industry and more specifically to a so-called drum cylinder, the basic construction of which comprises a vessel, into which suspension being thickened is supplied and a wire-surface cylinder rotating in the vessel. The drum filter is characterized in that the closure member of the drum filter has a channel for leading gas from the filtrate tubes through the compartments of the distribution chamber to the outside of the closing member. The method is characterized in that the operation phase of the filter cylinder is divided into five separate stages. In the first stage, when the cylinder descends on to the vessel, air and the initial filtrate are discharged from the filtrate components and the formation of the pulp web on the wire surface begins. In the second stage, filtrate is discharged with vacuum and the formation of the pulp web continues.