Abstract: A water filter includes a cartridge filter element mounted on a coaxial bearing so it can be spun. During normal operation, a pressure tank enclosure allows the outside of the cartridge filter element to be submerged. Filtered water is then collected by a filtered-water return inside the cartridge filter element. An air vent disposed in the pressure tank housing allows water to drain away before starting a cleaning cycle, and to bleed off trapped air before returning to normal operation. During cleaning, a flow of clean water is applied to the filtered-water drain. A wash drain in the bottom of the pressure tank enclosure allows used cleaning water to flow out. The reverse water flow through the filtered-water drain forces closed a flapper valve. This, in turn, causes a water spray jet manifold to fill under pressure and cleaning water sprays out from slightly offset nozzles directed at the cartridge filter element.

Abstract: A membrane separation device includes a washing apparatus and a membrane module. The washing apparatus is formed of a vessel for accommodating the membrane module therein, a first tank and a second tank for accommodating washing liquid for washing the membrane module in the vessel and connected to the vessel, a compressed gas feeding device connected to the first and second tanks for selectively feeding compressed gas into the first and second tanks to flow out the liquid therefrom, and conduits connected among the vessel, first and second tanks, and compressed gas feeding device. A conduit selecting device is attached to the conduits for feeding the washing liquid in one of first and second paths. In the first path, the compressed gas in the compressed gas feeding device is fed into the first tank, and the liquid in the first tank is fed into the vessel through the liquid inlet to wash the membrane module accommodated therein and is led to the second tank.

Abstract: A self-cleaning filter is provided for filtering particulate from a fluid flow stream such as water used in an irrigation system or the like, wherein a segmented filter element is backwashed or flushed clean in response to cyclic on-off supply of fluid. The self-cleaning filter comprises a filter housing having inlet and outlet fittings for in-line connection along a water supply conduit at a location downstream from a system on-off valve. The segmented filter element is supported within the filter housing, with a first filter segment aligned with an inlet port for filtering water. When the water supply is turned on, filtered water passing through the first filter segment initially backwashes through a second filter segment with increasing line pressure to flush prior-collected particulate thereon through a flush port. When the line pressure reaches a predetermined level, a normally open and pressure responsive flush valve closes the flush port.

Abstract: A system for filtering fluids uses the pressure differential across a filter element between an internal filter volume and an external filter volume to control the rate of fluid flow through the filter element. The internal filter volume communicates with a backwash volume contained in the external filter volume. The backwash volume may be movable relative to the filter element to clean accumulated filtrate from the filter element through backwashing. By increasing the pressure in the internal filter volume, the rate of backwashing can be increased while the rate of fluid flow into the internal filter volume is decreased. Particularly when the filter element becomes clogged, damage to a filter caused by an excessive pressure differential across the filter element may be decreased.

Abstract: Disclosed is an oil burning system that is capable of burning oils of varying viscosities, including high viscosity waste oils and low viscosity heating oils. Suitable as a new installation or a retrofit modification, the present invention incorporates the use of a variable rate, high-pressure oil delivery system, along with an oil pre-heater, in conjunction with a modified high-pressure atomizing nozzle. Installed in a sliding drawer burner arrangement that allows for quick and easy access, the oil burning system also includes a means by which particulate matter and carbonization build-ups are removed from the burner nozzle automatically, thereby eliminating the need for frequent cleaning.

Abstract: A filtration unit is provided with a self-cleaning mechanism which backflushes a screening element therein when it becomes blinded by solid material. A reservoir enables a head of screened liquid to be built up above the screening element. Upon blinding of the screening element, a subsequent rise in the pressure at the inlet of the filtration unit is detected by way of a rising fluid level in a vertically extending chamber. The above causes the opening of a discharge valve which enables a discharge flow to rapidly empty the reservoir through the screening element in a reverse direction, thereby clearing the screen. The clearing operation is carried out entirely hydraulically by the action of the screened fluid and thus no brushes, rakes or scraping devices are required.

Abstract: The present invention relates to flow control devices (4) for use with cartridge filter cleaning systems. The flow control device (4) includes a cylindrical portion (8) which extends away from a conical portion (6). When the device (4) is used with a nozzle (9) attached to a blow tube (13) the device (4) will uniformly clean a dirty cartridge filter (5). The advantage of the invention is that the device (4) can be used in the current range of air flow rates and nozzle sizes that are used in the cartridge cleaning industry. Whereas the prior art systems (7) show deficient performance when used across the full range of air flow rates currently applicable in industry.

Abstract: A filtration apparatus (10) for fluids containing solid matter and/or particles or the like is disclosed. The apparatus (10) comprises screen means (20) and barrier means (21) substantially adjacent and behind the screen means (20). The barrier means (21) has a plurality of corrugated ribs (23) with vent means (22) therein. The corrugated ribs (23) are elongate and parallel and are substantially concave corrugations when seen from the direction from where the fluid is coming while the corrugations are substantially aligned with the direction of the flow of the fluid.

Abstract: A filter element for a pressure filter where a substantially horizontal wall (3) divides the interior of a pressure vessel into a lower inlet compartment (5) and an upper outlet compartment (6). A filter element (20) having a filter medium (40) is suspended from the wall (3) such that the filtering takes place from the inlet compartment (5) through the filter element (20) up to the outlet compartment (6). A corrugated sheet (22) is provided which defines a plurality of substantially vertically extending channels (45) and (42). Each first channel (45) is open the inlet compartment (5) with the filter medium (40) covering the first channels (45) with the upper end of the first channels (45) being closed and the lower end of the first channels (45) being open at (43). The second channels (42) being formed on an inner side of the corrugated sheet (22) with an open bottom end and an upper end communicating with the outlet compartment (6).

Abstract: A filter cloth for liquid filtration is made as a long-pile fabric, the pile threads 21 of which lie on the flow side and are flattened against the supporting fabric during the filtration and form a deep filter. At the time of back washing they are straightened by the back washing and release the dirt particles. The back washing is performed preferably by means of a suction bar 13, which at the same time acts mechanically on the pile threads, in order to promote an abrupt straightening of the pile threads at the time of back washing and the flattening of the pile threads after the back washing.

Abstract: A vibratory separator having a resiliently mounted housing with a vibratory drive. A screen extends across the housing and a cover is positionable over the screen. The screen includes a discharge port therethrough aligned with a discharge passage for removing material from the top of the screen from the system. Another discharge passage cooperates with a manifold plate extending across the separator beneath the screen. An access port is provided through the cover and arranged to receive a discharge plug which can selectively close the discharge hole through the screen. In operation, separating or dewatering is first accomplished, the energy level of the vibration is reduced and a vacuum is drawn above the screen. Bleed air is allowed into the separator below the screen with a restricted flow so that a vacuum can be drawn. Once the material has dried, the vibrational energy can be increased and the plug removed from the hole through the screen. The process material may then be discharged from the unit.

Abstract: A liquid filter includes a barrel defining a cylindrical water chamber having a neck at the middle, a raw water inlet at the bottom side, and a clean water outlet at the top side, a suspension board suspended in the water chamber, a pneumatic cylinder operated to reciprocate pressure means through the suspension board in and out of the neck of in cylindrical water chamber, bundles of fibers respectively suspended from the suspension board for removing solid matter from upward flow of water passing through, a weight board connected to the bundles of fibers and suspended in the water chamber below the neck, and a fabric filter suspended in the water chamber below the weight board, wherein the sizes of the filtering open spaces in the bundles of fibers are reduced when the pressure means is lowered into the neck; the sizes of the filtering open spaces in the bundles of fibers are expanded when the pressure means is lifted away from the neck.

Abstract: A fluid filter assembly (20) includes an axially extending tubular housing shell (24) having an integral closed end (26), a distally opposite integral open end (28), and a sidewall (30) extending integrally between the ends. An annular filter cartridge (32) is in the housing shell. An adapter plate (48) has a first set of threads (50) thread mounting the adapter plate to the machine (22) from which fluid is filtered, and a second set of threads (54) engaging the threads (56) of the open end of the housing shell in thread tightened engagement. The housing shell is a singular one-piece member of sufficient stock and thickness at the open end to be internally threaded and to structurally support direct threaded engagement with the adapter plate without an intermediate structural support member.

Abstract: A liquid filtering apparatus which reduces or eliminates the need for regular manual cleaning or backwashing. Backwashing of the filter occurs automatically in response to sensed conditions of filtering. The filtering apparatus includes a chamber, and a filter element in the chamber, a valve for directing liquid through the filtering element in a first direction to filter the liquid. The valve reverses the direction of liquid flow through the filtering element when excessive resistance to flow through the filter element occurs.

Abstract: In a developing, etching and stripping apparatus, photoresist developing and stripping chemicals are drawn off into separate circulatory paths in each of which they are pumped through a heat exchanger, a series of tangential filters, an ultraviolet contactor and a collection tank. Permeate from the filters is returned to the developing or stripping stage, and solutions with high concentrations of solids are removed from the collection tanks for disposal. A similar system is used to recycle metal stripping solutions such as nitric acid-containing solutions, allowing recovery of metals.

Abstract: An activated carbon filter is regenerated while it remains positioned in a filter vessel by first draining both unfiltered and filtered water out of the vessel and then applying an electric current through the activated carbon body of the filter to drive off contaminants. An inert gas is directed through the filter in a direction opposite to that of the liquid flow and then contaminants are moved from the filter vessel to a multi-stage catalytic converter where they are completely oxidized.

Abstract: A self-gush-cleaning filter device comprises a filter casing (1) provided with an inlet passage (a) and an outlet passage (d), a screen (11) disposed within the filter casing (1) so as to slide along the inner surface of the filter casing (1) in the flowing direction of a fluid, a foreign matter ejecting opening (15) being formed between the screen (11) and the inlet passage (a). A drive shaft (4) for driving the screen (11), a screen driving unit (3) for driving the drive shaft (4) so as to move the screen (11) quickly in a downstream direction in which the fluid flows from the inlet passage (a) toward the outlet passage (d) and to move the screen slowly in an upstream direction. An outlet shutoff valve (14) is disposed in the outlet passage (d) of the filter casing (1). The screen driving unit (3) is actuated after closing the outlet shutoff valve (14) to move the screen (11).

Abstract: A connecting means for a water flow appliance, for example a hand shower, contains a connecting element connected to a water guide, for instance, a house water mains. Arranged in the connecting element is a sieve element which can be shifted between a sieve position, in which it acts a sieve, and a cleaning position in which it is possible to remove the particles retained in the sieve element. The sieve position is always assumed when a connection is made to the connecting means. When this connection is removed the sieve element can be translated into the cleaning position for example by water pressure. The water flow can be passed through said sieve element in the cleaning position preferably in the reverse direction so that said sieve element is back-washed.

Abstract: A self-cleaning liquid filter and a method for filtering a liquid are disclosed. In the self-cleaning liquid filter, a rotating hollow drum covered with a filter element is mounted in a filter housing and turned by a waste liquid that contains debris or dirt. Filtered or cleaned liquid enters into the hollow drum and is pumped away at one end of the drum while debris or dirt in the waste liquid are trapped on the filter. A spray nozzle is mounted inside the rotating drum and clean water is sprayed out to wash away the debris and dirt carried by the filter element into a debris collector equipped with a second filter. The debris and dirt are trapped by the second filter while a filtered, or clean liquid is drained back into the filter housing. The novel device is self powered by the waste liquid flow and thus no external power is necessary for operating the device.

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 method of recovering functional human leukocytes from blood filters used to deplete leukocyte content from leukocyte-containing blood-cell suspensions is provided. More particularly, this method involves isolating leukocytes from filters which have been used to purify red blood cells or platelets in isolation from leukocytes by back-flushing the used filters with a hemolysis solution, such as cold ammonium chloride, and collecting the functional human leukocytes.

Abstract: A permanent fluid filtering system includes a cylindrical body having an upper end, to which an inlet tube is connected, and a lower end, to which an outlet tube is connected, and a latitude thread filter assembly disposed within the cylindrical body. The latitude thread assembly is compressible and expandable in accordance with a fluid flowing direction, thereby varying a porous structure of the filter assembly. The permanent fluid filtering system further includes a fluid flow stabilizing plate for stabilizing the flow of dirty fluid fed inside the body through the inlet tube.

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 fluid treatment apparatus comprises two titanium mesh filters (12,22) connected in series across a flow passage. Each filter (12,22) is irradiated by UV light from respective lamps (13a,13b,23a,23b), so as to kill any micro-organisms trapped on the filters. Backwashing means (18,19,28,19) are provided for backwashing each filter in succession whilst fluid flowing along the passage is filtered by the other filter. In this manner micro-organisms are unable to pass through the apparatus untreated.

Abstract: A method and an apparatus for cleaning filters contaminated by hot-melting resins and polymers in situ, without removing the filtering elements. The method comprises a preliminary step, during which the circulation of the product to be filtered through the filter to be cleaned is interrupted, and a draining step, during which a pressurized draining fluid is passed through the filter in order to empty the filter of the residual product. A filter cleaning step is then performed during which a cleaning fluid, constituted at least partially by superheated steam, is passed through the filter. The fluids used to clean the filter are then subjected to treatments to eliminate pollutants.

Abstract: A method for withdrawing priming fluid from the extracorporeal circuit of a dialysis machine is described which substantially prevents return of the priming fluid back to the patient. In accordance with the method, priming fluid is drawn from the extracorporeal circuit through the dialyzer membrane and into the dialysate circuit. Blood is introduced into the extracorporeal circuit as the priming fluid is withdrawn through the dialyzer. Withdrawal of the priming fluid may be accomplished by pumping the blood pump in the forward direction at a first rate and operating a pump in the dialysate circuit at a second rate. Valves in the dialysate circuit are operated such that the pump in the dialysate circuit draws priming fluid across the dialyzer membrane into the dialysate circuit, and thereby prevents the priming fluid from being returned to the patient.

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: An improved filtration system comprises a vessel divided into a concentrate chamber and a permeate chamber by a permeable septum. An ultrasonic wave generator is mounted to the vessel and positioned to direct ultrasonic waves through both the permeate contained in the permeate chamber and the permeable septum. A circulator such as a pump or agitator is operably associated with the concentrate chamber to provide a shearing force on the surface of the permeable septum. A vessel inlet port allows concentrate to flow into the concentrate chamber and a permeate outlet port allows permeate to be withdrawn.

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: A water reclamation system for a vehicle wash system that provides water that is purified to enable reclaimed water to be used in a positive displacement pump. The reclamation system provides for continuous flow of water through the vehicle wash settling pit with an aerator to oxygenate the water and prevent odors typically produced by stagnant water from wash system settling pits. The water reclamation system is operable to clean the carwash system settling pit except for the primary pit in which the debris accumulated from the secondary settling pit is deposited.

Abstract: A liquid cleaning system, which includes a barrier type filter having a back-flush arrangement for recovering filter contaminants from the back-flushed liquid which is available only at a low, not necessarily consistent, rate, includes a fluid-powered centrifugal cleaner which, in addition to the normal shaft-mounted rotor through which liquid is passed to separate contaminants centrifugally due to rotor speed, includes fluid drive means in the form of fluid reaction drive nozzles supplied with pumped liquid from the system as a drive fluid to rotate the rotor at a speed above the minimum to effect centrifugal separation of the contaminants from the back-flushed liquid in the rotor and accumulation of the outlet of the rotor. The spent drive fluid mixes with the cleaned back-flushed liquid in a discharge region and both may be re-used in the system.

Abstract: A filtering apparatus is provided wherein the filter can be backwashed by an explosive-like surge of backwashing fluid. The backwashing assembly includes a quick-opening backwash valve which is not actuated by a linearly-acting valve stem disposed on the outlet side of the valve. In a typical embodiment, the inlet valve to the filtering apparatus is a rotating butterfly valve and the backwash valve is physically attached to the inlet valve, such that, when the inlet valve is open, the backwash valve is fully-closed and when the inlet valve is moved towards its fully-closed position, the backwash valve is fully-opened. The invention uses a two-step method of initially applying biasing pressure on the inlet valve/backwash valve combination and to thereafter provide additional pressure to dislodge the backwash valve from the valve seat--whereupon the backwash valve quickly opens and an explosive-like surge of backwashing fluid effectively backwashes the filtering media.

Abstract: A surface scrubbing machine includes a body, wheels for supporting the body am& cylindrical scrub brushes mounted on the body for cleaning an adjacent surface. There is a clean water solution tank on the body for supplying a cleaning solution to the surface to be cleaned. A recovery tank is positioned on the body and there is a vacuum system for suctioning used cleaning solution from the surface being cleaned and for conveying it to the recovery tank. A filter is positioned in the recovery tank and there is a pump for transferring filtered solution from the downstream side of the filter to the clean water solution tank.

Abstract: A high efficiency backflush filter apparatus positioned on the downstream side of a filter frame that includes a bellows attached to the top of the filter frame. The backflush filter apparatus includes a collapsible bellows member having a first opening attached to an aperture in a plate member, a second opening attached to the filter frame, and a compression plate positioned above the plate member and having a one-way valve. In the preferred embodiment of the present invention, the plate member is slidably mounted on at least one guide member which is mounted to the filter frame and the plate member is spring biased away from the filter frame so that the bellows is in an expanded configuration. The backflush procedure is achieved by stopping the pump, and moving the compression plate, using air cylinders or some other device, until it is against the plate member and thereby trapping fluid inside the bellows.

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

Abstract: A self-purifying filter apparatus comprising (1) a filter having a first surface and a second surface; (2) flow control means, such as a vacuum pump, for causing a stream of fluid interspersed with solid particulates to pass from the first surface to the second surface through the filter, thereby removing some of the solid particulates from the first stream of fluid and depositing them on the first surface; and (3) a purging device, such as a small reservoir of water (potentially formed, in part, by water previously filtered by the filter), for causing a second stream of fluid to pass from the second surface to the first surface through the filter without substantially changing the position of the filter, thereby rinsing and removing from the first surface at least some of the solid particulates that were deposited there.

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: Apparatus for treating a liquid containing suspended solids comprising a clarifying vessel and a number of filters positioned around the periphery of the clarifying vessel for receiving and filtering liquid from the clarifier. A filter may be backwashed by isolating that filter, filling the other filter cells with clarified liquid and draining them into the isolated cell to remove filter media contaminants.

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 fluid filter (10) includes a housing (14), a mounting head (16), a filter element (34), and a pressure sensor (54) mounted to the housing (14) and having a high pressure port (58) communicating with the high pressure side (36) of the filter element (34) and having a low pressure port (60) communicating with the low pressure side (38) of the filter element (34) to sense the pressure drop across the filter element.

Abstract: The present invention relates to a filter unit, and a filtering system using the filter unit. The filter unit includes a housing having a longitudinal axis and an inlet and outlet for fluid containing solid contaminants and a back-flush inlet and back-flush outlet for cleansing fluid. This housing contains a substantially cylindrical filter element which has a longitudinal axis coincident with the longitudinal axis of the housing. The filter element has disposed within it a conduit, adapted to be opened to atmospheric discharge, having a longitudinal axis coincident with the longitudinal axis of the filter element. The conduit also has disposed along its surface cleansing members, which extend from the conduit to the filter element and have apertures to allow the cleansing fluid to flow through the members and into the conduit.

Abstract: A high capacity filter apparatus for removing solids from fluids includes a opposing filter elements defining an internal volume. Fluid to be filtered passes through the filter elements into the internal volume and through an outlet. The filter element is continuously cleaned by backwashing along the outer surface of the elements.

Abstract: A filtration apparatus, used for obtaining cutting oils cleaned by using filtration apparatus so as to reuse the separated cutting oil in machining operations, includes an oil tank for storing filtered cutting oil, a storage tank for temporarily storing the filtration target cutting oil, a rotatably driven filtration drum, rotatably supported in the storage tank and having a side-surface in order to let a filtered oil to flow into the liquid tank, a dynamic seal member provided between the filtration drum and side wall of the storage tank, an injecting means for washing filters and dip-up plates for continuously conveying cutting downward from a charge port to discharge port.

Abstract: The piston arrangement includes one or more pistons, each propelled by a pneumatic actuator. Alternately, an accumulator-type actuator may be used, wherein compressed gas is inputted directly into the backflushing fluid chamber to reverse fluid flow through the filter arrangement.

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: Rolling solutions used in cold rolling are pressurized and filtered at working temperature using a filter of the scanning flush type in which flushing nozzles exhausting to a low pressure zone are scanned over an upstream surface of the filtration medium during flushing cycles triggered by a pressure drop across the filter exceeding a predetermined level. Flushing retentate exhausted during the flushing cycles is treated in a secondary filter. Harmful particulates can be removed without retaining wanted components of the rolling solution.

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 drum filter system includes a tank in which a rotary drum is disposed with liquid to be filtered entering inside the drum and exiting peripherally of the drum. The drum consists of a plurality of individual filter elements that are removable in a direction parallel to the axis of rotation of the drum. Each filter element is mounted using a unique mounting bracket assembly. A backwashing sub-system is provided that allows backwashing of individual filter elements as they are indexed into alignment with the backwashing sub-system. A conveyor conveys material removed from the filter elements by the backwashing sub-system to a point of discharge.

Abstract: A backwash filter system includes a filter array comprising a plurality of filter units each having a housing, a filter element unit and a process liquid inlet port and a filtered liquid outlet port connected respectively with process liquid inlet and filtered liquid outlet sides of the filter element unit for filtering process liquid. A process liquid inlet header connects to the process liquid inlet ports of the filter units. A filtered liquid outlet header connects to the filtered liquid outlet ports of the filter units. A first valve unit on the process liquid inlet header is switchable for connecting same alternatively to a process liquid source and a backwash liquid drain. The filtered liquid outlet header can communicate with a filtered liquid receiver.

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.