Abstract: A filter apparatus includes a tank having an inlet and an outlet, a filter frame disposed inside the tank between the inlet and outlet, and filter material supported by the filter frame. The filter material filters out suspended solids from liquid influent that is passed through the filter material as the liquid influent flows from the inlet to the outlet. The filter apparatus is provided a suction generating assembly having a positive displacement pump, and a suction member in fluid communication with the pump and positioned adjacent an inlet surface of the filter material. The suction generating assembly is operable to draw filtered liquid in a reverse direction through the filter material to remove filtered solids therefrom. The filter apparatus also utilizes spray nozzles for directing a liquid stream of a cleaning solution at high velocity to the filter material thereby washing the filter material.

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 uniform area shower for use with a disc filter. The disc filter includes at least one disc and moving showers that periodically remove a precoat layer of solids from the surface of the disc. In one embodiment the uniform area shower comprises a oscillating shower that is pivotly mounted and travels radially over the disc. In an alternative embodiment the uniform area shower comprises a traversing shower that mounts to a carriage and travels radially over the disc. Each shower includes a controller controlling the drive mechanism to vary the speed of transport of the shower across the surface of the disc such that time spent by the shower cleaning the disc at each radial cleaning position is generally proportional to the radial distance of the cleaning position from the center of the disc so that a wash liquid is applied to a uniform area of the interior and exterior of the disc.

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 method and apparatus thickens lime mud with a disc filter in such a way that the precoat layer on the filter surfaces of the disc filter can be cleaned. Beneath the scrapers for scraping a dry layer of lime sludge from the precoat layers on the disc filter wires surfaces one or more high pressure nozzles, and optionally a low pressure nozzle, are provided for directing jets of liquid at the precoat layer and wire surface. One high pressure nozzle may remove the precoat layer while another cleans the wire surface, and the nozzles may be reciprocated (with respect to the shaft for rotating the disc filters in a trough). The high pressure jets provide liquid at a pressure of about 30-100 bar, while the low pressure jet pressure is between 2-30 bar and may be utilized continuously, or arrested when the high pressure jets are operable.

Abstract: A method and apparatus to clean a filter drum used for thickening lime mud. The drum is rotated about a horizontal axis in a first direction so that the circumferential surface of the drum moves into contact with lime mud in a vat and a precoat layer formed on the drum, as well as an external layer of lime mud which forms a thickened lime mud cake when a vacuum is applied to the drum withdrawing liquid from the lime mud. The thickened external layer of lime mud cake is scraped from the drum at a second side of the vat, and at a first opposite side of the vat a first jet of liquid is directed onto the drum surface (e.g. at a pressure of about 30-100 bar) to remove a strip of the precoat layer, a third jet of liquid cleans the drum after removal of the precoat layer, and a second jet of liquid is directed onto the drum with sufficient intensity (e.g. a pressure of about 2-20 bar) to remove, by spreading and partially detaching, a strip from the thickened lime mud cake.

Abstract: Centrifugal filtration capable of improving recovery of crystal in a baskey. The basket is so arranged that a central axis thereof is inclined with respect to a horizontal direction to obliqely downwardly orientate a bottom wall of the basket. A crystal recovery auction pipe is arranged which includes a pivotally movable section pivotally moved in the basket, of which a distal end is advanced into crystal in the basket. Crystal in the basket is recovered by suction through the distal end of the suction pipe, which is ultimately displaced to a corner of the basket between a lowermost portion of a peripheral wall of the basket and a bottom wall thereof. This permits crystal collected to a lowermost section of the basket to be substantially recovered by suction through the suction pipe, to thereby improve crystal recovery.

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 filter for suspensions with an impeller generating controlled turbulence for suspended solids, comprising an inclinable filter body 1 which shelters a filtrating element consisting of a filtrating sleeve (10) and an impeller (11) working together. The sleeve (10) is mounted on filter body (1) by means of supports (12) and it shelters a part of the impeller (11), comprising an axle (13) which is subject to a motor assembly (14), located outside body (1) and around which are mounted radial blades defining two phases: an inlet phase (15) and a processing phase (16), the latter being lodged inside the sleeve (10) and a washing device (31) for the sleeve (10). The inlet phase (15) comprises blades (20) in the form of a short pace propeller to give axial impulse, and no radial impulse, to the liquid to be filtrated. The processing phase (16) comprises blades in the form of a long pace propeller (21) to give impulse of great radial intensity, and small axial intensity, to the liquid.

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 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 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 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: In a rotatable filter, such as a disk filter, for separating solid particles from a liquid mixture, in which a filter material (3) is partially immersed, a cake-removal member (11) is designed to take off a layer of the formed cake of solid particles from the filter material, so that a liquid-permeable coating, which itself acts as a filter medium, is left on the filter material which is moved down into the liquid mixture which is to be separated. According to the invention, for renewing the coating a spraying apparatus (13-17) is designed to spray jets of liquid in at least one spray zone (18), through which only a part of the filter material passes upwards during the rotating movement of the filter material, so that the whole cake of coarse particles, including the coating, is removed from the part of the filter material by the jets of liquid.

Abstract: Apparatus for cleaning fluids, especially cooling lubricants of machine tools. The apparatus includes a tank having a partition subdividing it into a sedimentation chamber and a clean chamber and having an inlet for the contaminated cooling lubricant and a discharge device for the cleaned cooling lubricant. A filter is mounted between the sedimentation chamber and the clean chamber and a conveyor device is mounted in the sedimentation chamber for removing sedimented particles from the tank. An environmentally safe and low-maintenance cleaning apparatus according to this invention is created by the fact that the sedimentation chamber is subdivided by a partition into an inlet area and a preliminary cleaning area that are connected to each other by a passage in the lower area of the partition. The filter is an edge filter mounted in the partition between the preliminary cleaning area and the clean chamber.

Abstract: An apparatus for the mechanical cleaning of liquids, especially cooling water delivered from a heat exchanger and flowing in a pipeline (10), with a rotationally symmetrical, conical sieve (12) of substantially the size of the pipe diameter, as well as a coaxial suction device (20) which is disposed on the upstream side of the sieve, is mounted for rotation continuously or with interruptions for the duration of a cleaning interval, and during the cleaning interval sucks bit by bit the entire surface of the sieve (12) on the upstream side, the sieve (12) being divided into areas, the intake nozzle (22) of the suction device (20) can cover each area, and in each area of the actual sieve surface and of the suction device there is a cavity for the temporary accommodation of contaminants, the sieve (12) being divided on its upstream side by substantially radial barriers (36) into individual sectors forming the areas, the intake nozzle (22) of the suction device (20) has such a shape that, at the moment in which th

Abstract: A single roll wash press comprising a housing and a drum rotatably mounted within the housing. The drum includes a perforated outer wall and a longitudinally extending centerline axis and is rotatable about the axis. The press further comprises a means for receiving a flow of pulp having an initial consistency ranging from about 2% o.d. to about 6% o.d. such that the pulp flows in the direction of drum rotation, and a means for defining a divergent formation zone and for forming a mat of the pulp on the drum within the divergent formation zone. The means for defining and forming comprises a first arcuate portion of the housing with the formation zone being divergent between upstream and downstream ends thereof. The upstream end of the divergent formation zone communicates with the means for receiving the flow of the pulp. The press further includes a means for washing the pulp mat within a displacement zone disposed downstream of the extraction zone.

Abstract: A self-cleaning, self-propelled strainer designed for installation in boiling water reactor suppression pools. The strainer is designed to prevent strainer clogging and subsequent loss of the emergency core cooling system flow during a postulated design basis loss-of-coolant accident. This self-cleaning strainer is driven by a turbine placed in the strainer flow path. The turbine drives rotation of a brush-and-plow arrangement. The wiping action of the brush and the centrifuging action of the plow remove insulation debris and other particulate matter which might be generated by the LOCA, thereby preventing the strainer from plugging.

Abstract: The invention refers to a rotary filter with a device for separating a liquid-solid mixture, particularly a pulp suspension, with several separate zones, at least one of which is of variable design. It is mainly characterized by the variable design for the length and/or position of the atmospheric zone and the vacuum zone.

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 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: A screening chamber for filtering paper coatings is cleaned with the use of a plurality of water sprays. The water sprays are provided by nozzles located on spray bars positioned transversely across the width of the screening chamber. The nozzles are oriented to direct selected spray patterns tangentially against the screens, and against the interior surfaces of the screening chambers, to remove particulates, debris and other contaminates which collect on the screen during the filtering process.

Abstract: The invention provides a self-cleaning inlet head for a fluid, operable in a first, draining, mode and in a second, backflushing, mode, including a body having a front end and a rear end; a piston slidably mounted in the body and having having a front face and a rear face; a first space extending between the rear end of the body and the rear face of the piston and a second space extending between the front face of the piston and the front end of the body; a bore connecting the first space and the second space; a valve mounted in the first space for closing off the bore during the second mode of operation; an aperture for access of the fluid from outside the head into the second space in the first mode of operation, and for exit from the second space in the second mode of operation, wherein, at the onset of the second mode of operation, the valve closes off the bore and subsequently moves the piston, thereby initiating a mechanical shearing action loosening any occluding matter in the aperture.

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 method and apparatus for improving the operation of a vacuum drum filter. A hollow and perforated shower roll is located at the top of a vacuum drum apparatus for drying and cleaning paper pulp. The interior of the shower roll is provided with a liquid distribution pipe having a plurality of spaced openings therealong, the pipe also having a substantially vertically extending dam which extends radially to adjacent the lower interior surface of the shower roll. In operation, rotation of the vacuum drum in a vat of paper pulp to be dewatered results in the continuous formation of layer of pulp on its exterior surface, the layer being compressed by the shower roll at the nip between the vacuum roll and the shower roll. Concurrently, the shower roll discharges or exudes water onto and into the pulp layer at the nip.

Abstract: A method for assembling an apparatus that removes solid waste material from a stream of water. The apparatus sits in a channel within which the water containing waste material flows. A plurality of vertically oriented, laterally spaced apart, rotating screens are driven by sprocket segments and provide a filtering function. The screens are formed by plural loops of articulated links. Each link includes a horizontally-extending part that lifts solid matter from the stream as the screens rotate. The assembly method includes placing the links on shafts in a predetermined pattern that creates a frusto-conical space bordered by links. The frusto-conical space provides ample clearance space for each sprocket segment and ensures that the sprocket segments will not rub against the links which in turn prevents the parts of the apparatus from becoming misaligned with respect to one another so that the apparatus may operate for extended periods of time without requiring adjustment.

Abstract: An assembly for recovering crystals from a slurry comprises a filtration unit including a rotatably mounted cylindrical filter, a slurry input for receiving slurry pressurized by a pump. The filtration unit has an outlet for discharging crystalline material separated from the slurry by the filtration unit. A first hopper connected to the filtration unit at the discharge outlet thereof is provided at a downstream side with a first valve unit which is in turn connected to a second hopper on a downstream side. A second valve unit is coupled to the second hopper at a downstream side thereof. Each of the valve units includes a rotatably mounted dome shaped valve member. The second hopper is provided with a vent extending to a gas storage tank. A conduit links the hoppers to one another for substantially equalizing pressure in the hoppers prior to an opening of the upstream valve during a discharge procedure.

Abstract: A rotating drum filter assembly for thickening lime sludge includes a liquid jet distributor for directing liquid jets against a strip of lime sludge filter cake on the ascending side of the drum. The distributor is positioned on the ascending side of the drum and within 45.degree. of a vertical plane tangential to the drum peripheral surface. The liquid jets are directed so as to disperse the strip in a manner such that substantially all of the lime sludge comprising the strip remains on the drum. Cake wash water formed by water distributed from shower heads immediately refills the cleaned strip thereby minimizing loss of vacuum within the hollow drum interior.

Abstract: A method and system for purifying a contaminated fluid in a continuous manner is herein disclosed. The present invention provides for the irradiation of a slurry between a defined surface(s) such that substantially all of the contaminants are removed from the slurry, and a turbulent flow of the slurry is achieved. The present invention further provides for the separation of decontaminated effluent from the slurry by employing ceramic membrane filters. Air is applied to the ceramic membrane filters at relatively high pressures in order to remove any photoreactive catalyst particles that have collected in the ceramic membranes.

Abstract: An apparatus which performs solids particles separation from a liquids/solids slurry, and subsequent drying of such solids particles, within a single enclosure. Further processing functions, such as reslurry washing, plug washing, crystal growth and other reactions, can also be carried out within that single enclosure.

Abstract: A back-flushable strainer is used for filtering water to an emergency cooling system in a nuclear power plant having a reactor arranged in a containment whose lower part forms a condensation pool in which the strainer is mounted. The strainer has a suitably cylindrical strainer wall having a plurality of perforations through which the water flows from the outside and in when filtering, while the direction of flow is the reverse in backflushing. A number of wings are arranged on the outside of the strainer wall, dividing a residue or fibre mat built up on the outside of the strainer wall into a number of sections which separately are more easily released than a continuous, circumferential fibre mat.

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 and a deflector substantially equal in length to the scraper. Nozzles may be provided for directing pressurized cleaning fluid toward the cleaning device.

Abstract: A method and apparatus for removing solids from the porous surface of a rotating vacuum drum. Such drums are used to separate the solid and liquid phases of a slurry, such as a calcium carbonate containing mud slurry. Doctor blades are often used to scrape the drum exterior surface of excess mud to minimize the build up of solids thereon. Nonetheless a cake eventually forms on the drum and clogs the porous surface and stops the vacuum action. The drum is stopped and the drum backwashed by water to dislodge the cake. According to this invention, a jet of water from a nozzle is substantially tangentially directed against the drum surface to thereby eliminate stopping the drum for cake dislodgement. The nozzle is located beneath and moves with a reciprocating secondary doctor blade, the secondary doctor blade being of a length less than the width of the drum. A stationary, main doctor blade spans the entire width of the drum.

Abstract: A self-cleaning stationary basket strainer has a housing with an inlet adjacent the top and an outlet adjacent the bottom, with a stationary strainer basket contained therein spaced from the wall of the housing. A flush discharge opening and a backwash discharge opening and provided in the closed bottom of the housing. A hollow backwash conduit is provided adjacent the inner surface of the strainer basket, adapted to move about the inner periphery thereof, and has a passage in the wall thereof communicating with a chamber in the conduit. A discharge section on the hollow backwash conduit communicates with the backwash discharge opening in the housing, the backwash discharge opening sealable when not in use. A scraper blade and extension member are provided on the hollow backwash conduit forming a channel which communicates with the passage. A rotatable brush may also be used which moves about the inner periphery of the strainer basket and brushes the inner surface of the strainer basket.

Abstract: A filter including one or more regenerative plates which can be moved along the surfaces of filter grids to simultaneously create turbulence and physically dislodge a filter media cake within the filter by use of an externally extending driver rod, so as to regenerate the filter media.

Abstract: An apparatus for separating solids from liquids including an endless rotatably mounted band of collecting arms for collecting screened solid material, each of the collecting arms having a leading collecting face and two opposite sides adjacent the leading collecting face, and being mounted on support rods which are arranged in spaced relationship around the band, link pieces rigidly attached to the collecting arms for linking one support rod to the next, such that the link pieces form continuous chains around the band, and separate the collecting arms one from the other to form slots between the link pieces, said link pieces being rotatable on the support rods to which they are attached, and a rotatable set of discharging teeth arranged to cooperate with said movable band by entering the slots as the band rotates to move along the leading collecting faces of the collecting arms, thereby to remove collected material gathered at the slots and from said leading collecting faces of the collecting arms.

Abstract: A method and apparatus for cleaning a filter apparatus of the type having an atmospherically vented tank, a rotatable filter frame in the tank having filter material thereon providing one or more filter effluent compartments on the filter frame. An influent line supplies liquid containing suspended solids to the tank and a filtered effluent outlet communicates with the filter effluent compartment, and a spray wash device including spray nozzles is operable during a wash cycle to direct high pressure liquid spray at a side of the filter material on the filter frame in a spray zone. An air tight hood is mounted inside the tank and extends above the upper periphery of the filter frame to an open lower end below the spray zone.

Abstract: A method of cleaning metal filters of a solvent spun fibre production plant. The method comprises the step of (a) dissolving dope from the filters using a hot solvent for the dope, (b) washing the solvent from the filters using hot water, (c) pyrolysing remnants of dope or solvent in the filters, (d) ultrasonically washing the pyrolysed particles from the filters, (e) reheating the filters to dislodge pyrolysed particles, (f) ultrasonically rewashing the filters and (g) drying the filters.

Abstract: The grit conveyance system of a classifier having a wash region above the liquid layer is provided with a vacuum means in the wash region for positive removal of liquids through a metal screen for disposal.

Abstract: The invention pertains to a device to separate solid materials from a stream of liquid, particularly from cooling water. In the case of the known devices, difficulties occur in cleaning the filter from fibrous contaminants generally or starting with a certain size. The subject device draws off fibrous as well as coarse grained contaminants equally well.A preferably funnel shaped filter 3 with a suction device 4 running at an angle to the surface line 6 of the funnel filter 3 is arranged in a pipe shaped housing. The inclination creates a force component 19 which transports the coarse grained contaminants to the tip of the filter where they are drawn off by the suction opening 8 of the suction rotor 7. The fibrous contaminants are drawn off by the suction device 4.

Abstract: A self-cleaning filter including a filter housing having at least a raw-liquid inlet and a clean-liquid outlet, a filter medium interposed between the raw-liquid inlet and the clean-liquid outlet At least one nozzle is located in proximity to the filter medium and is connectable to at least two different sources of pressure, one of which pressures is higher than the pressure prevailing in the filter, the other one being lower than the pressure prevailing in the filter There is also provided an arrangement to produce a relative movement between the filter medium and the at least one nozzle to the effect of having a substantial part of the surface area of the filter medium covered by the nozzle.

Abstract: Disclosed are a filter cake scraping method which can scrape a filter cake layer deposited on the surface of a filter drum with a scrape blade even if the particles of the cake are fine, and a rotary drum filter using this method. When pressure inside a suspension vessel rises above a predetermined value, a control means quickly reduces the pressure. Accordingly, precoated material or the like, which has been deposited on the filter drum, expands to push a layer of filter cake outward, thus permitting a scrape blade provided beside the filter drum to scrape the expanded cake layer.

Abstract: A method of removing water from lubricants, coolants and the like consisting of the following described steps. Firstly, pass lubricants through a heater at a predetermined flow rate to decrease its viscosity. Secondly, pass the heated lubricants through a vertical separation vessel which agitates the lubricants such that water entrained in the lubricants is released as steam. Thirdly, recirculate the heated lubricants repeatedly through the separation vessel at a recirculation flow rate that exceeds by many times the flow rate through the heater, thereby improving the degree of separation of water from the lubricants with each pass through the separation vessel. Fourthly, draw lubricants periodically from the separation vessel as the flow rate through the heater permits.

Abstract: A continuous, low shear solids dissolution system involving a water supply system (100), polymer metering system (120), mixture feed tank (152), mixture pump (154), mixture conduit (172), undissolved polymer dispersal element (188), solution sieve assembly (210), and holding tank (250). The polymer-water mixture (156) is pumped through mixture conduit (172). Undissolved particles of polymer encounter dispersal elements (188) and the particles are more uniformly dispersed. Any particles which are carried undissolved out of the mixture conduit (172) are forced through sieve (214) to further disperse the polymer in the water. The undissolved polymer is completely dissolved by low shear agitation in a holding tank (250).

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

Abstract: The present invention is an automatic filter cleaning system which includes a solvent dewaxing filter which removes wax from a wax mix slurry and provides a filtrate. Status control apparatus is connected to the filter for affecting the operational status of the filter. Drain apparatus responsive to a control signal controls draining of the filter. Cleaning apparatus is also connected to the filter. A control network connected to the status apparatus, the draining apparatus and the cleaning apparatus controls those apparatus in a manner so as to allow selective changing of the status of the filter from an operational state to a down state to automatically drain the filter and clean the filter while the filter is in the down state.

Abstract: Apparatus for dehydrating sludge originating from water purification stations, comprising a draining grid part positioned above a pressing-belt filter part, and a device for washing the grid wherein the device is positioned above the grid, so as to limit the drop height of the flocculated sludge between the grid and the belt, thus avoiding deflocculation of the sludge between the thickening stage and the dehydration stage, the washing of the grid being performed concurrently with the movement of the sludge on the grid.

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.