Abstract: The invention relates to a device for treatment of drilling mud and cuttings, comprising a screen, a centrifuge (10), a degassing system (6), a discharge system directing the drilling mud back to the active drilling mud system (13, 14), a transport system (17) transporting the cuttings. The screen is a rotating drum (3), and the drum is situated in a mainly enclosed housing (1) with the housing being connected to a vacuum suction system. The solid material discharge from the rotating drum (3) is connected to a downstream centrifuge (10), by a mainly enclosed pipe system (9). A weighing cell (16) for cuttings is connected to the centrifuge (10).

Abstract: A process for thickening a fibrous pulp suspension by guiding the suspension between a rigid first face and a flexible second face that move in relation to each other and form a converging draining gap, where the first face and/or the second face is/are water permeable, and where the process includes providing the suspension to be drained, forming from the suspension a fibrous pulp layer with a solid matter content of at least about 4% on at least one of the first face and the second face, guiding the fibrous pulp layer into the draining gap, applying a pressure differential in the draining gap via the second face to thicken the fibrous pulp layer, the pressure differential being formed by stretching the second face and pressing the first face and the second face toward each other to drain water from the fibrous pulp layer, and transporting the thickened fibrous pulp from the draining gap.

Abstract: A screening apparatus (1) for sewage (13) including liquid (4) and debris and flowing in an oncoming tube (23) includes a conveyor assembly (6) and a separation area (2). The conveyor assembly (6) has a tube-like housing (7), an axle (8) driven by a motor, and a screw (9) provided on the axle (8). The conveyor assembly (6) with its axis (10) is arranged substantially vertical to convey the debris in a substantially upward direction. The separation area (2) of cylindrical shape to deposit the debris has an axis (5), an inner surface (41), a circumference, and openings (3) located about the circumference. The separation area (2) with its axis (5) is arranged in alignment with the substantially vertically arranged axis (10) of the conveyor assembly (6). The separation area (2) is connected to the housing (7) of the conveyor assembly (6), and includes an opening (17) serving as an inlet (40) for the sewage (13) into the interior of the separation area (2).

Abstract: An apparatus for extracting liquids from a slurry formed of liquids and fibers, like diluted manure or paper mills residue. The apparatus has a rotatable drum covered with a resilient layer. The apparatus also has two draining rolls which are pressed against the drum so that the slurry passing in between is squeezed. Each roll has a hollow cylindrical shell with a uniform distribution of openings. Each roll also has a perforated filter screen fixed to is. The screen has perforations evenly distributed so that only some perforations lie over the openings in the shell. The perforations are smaller in size than the openings. The apparatus also has a pair of wipers in order to wipe the fibers out of the draining rolls and guide the liquids collected in the shells towards a liquids outlet. A reservoir can be mounted above the drum and upper draining roll for receiving the slurry, storing it to build-up a constant pressure, and supplying it in a continuous manner.

Abstract: Process and device for draining a fibrous pulp suspension. The process may include positioning two surfaces to converge in a downstream direction, feeding the fibrous pulp suspension between the two converging surfaces, driving at least one of the two converging surfaces to move the suspension with a relative translational velocity, and draining the fibrous pulp suspension through each of the two surfaces. The device may include two arcuate surfaces positioned to form converging surfaces. One of the two arcuate surfaces may include a drivable, pivotable, and rotatable cylinder having an outer sleeve with openings, the other of the two arcuate surfaces may include a screen positioned to be guided around at least a portion of the outer sleeve. The screen and the openings may form drains for draining the fluid pulp suspension.

Abstract: A device to drain a fibrous pulp suspension including an arched surface that is impermeable. The arched surface, moreover, is surrounded by a permeable belt. The belt and the arched surface are able to be moved such that there exists a relative velocity between the belt and the arched surface. The arched surface includes recesses that are able to take up quantities of fluid.

Abstract: A screen cylinder, screen, method of manufacture of the screen cylinder, and method of use of the screen cylinder, allow screen capacity to be maximized without sacrificing screen cylinder strength, and while achieving a clean accepts flow. A screen cylinder is constructed in a conventional manner except that at least one reinforcing ring is permanently fastened (typically by continuous or spot laser or electric beam welding, or direct resistance welding) to at least a majority of (and typically essentially all of) the land areas which separate grooves in a row from each other, at the outlet surface of the cylinder, or at least one spiral ring is applied. In this way effective slot length of screen cylinders may be about 65-90% of the total screen length, compared to only about 45-55% for conventional screen cylinders. The screen cylinders are particularly effective in screening cellulose pulps from the pulp and paper industry.

Abstract: An improved hood enclosure for isolating wood pulp washing equipment from the ambient environment. The hood has a pair of end members, a pair of skirts along each side to connect to the end member together, and an upper spine also connected at each end to the end members. A pair of clamshell style doors are mounted to the spine along longitudinal hinge lines and are opened vertically. A plurality of access doors are positioned within the skirts, and a plurality of spray or shower pipes penetrate the hood through an end panel to deliver wash liquid to the internal wash drums positioned within the wash vat. Several sealing methods are incorporated to provide sealable access for the access doors, the clamshell doors, and access to the interior of the washing vat for the shower pipes. The clamshell doors abut a peripheral neoprene sealing gasket and are held against the gasket by their own weight.

Abstract: An apparatus for processing a solid-liquid material comprises a housing formed with a series of interconnected chambers defined by chamber walls with at least two drums mounted in series within the chambers. Each chamber receives one of the at least two drums for rotatable movement therein. Each chamber and the associated drum are dimensioned to define a region therebetween to retain the solid-liquid material. The regions of adjacent chambers communicate with each other to define a continuous passage from drum to drum through the apparatus. An inlet in the housing admits the solid-liquid material to the passage, and an outlet permits extraction of a processed solid-liquid material from the passage. Each drum rotates in a direction opposite to the adjacent drum to advance the solid-liquid material through the passage from drum to adjacent drum in a sinuous path such that the curvature of the solid-liquid material changes when passing from drum to adjacent drum.

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 filtering apparatus and filtering system where a hinge belt 10 of a hinge-belt type filtering apparatus 100 is continuously rotated by driving of a drive motor 65 such that hinge scrapers are rotated along a bottom plate 6b of the hinge filtering apparatus main body, from a horizontal part to a slope part of the hinge filtering apparatus main body.

Abstract: A method for concentrating a suspension comprises the steps of providing a first surface; providing a second surface; introducing a suspension; moving the second surface relative to the first surface; and applying suction to the second surface. The first surface is relatively liquid-tight and includes a feature for increasing friction. The second surface is relatively liquid-pervious, faces the first surface, and is moveable relative to the first surface. Introduction of the suspension between the first and second surfaces forms a suspension web. Moving the second surface relative to the first surface and applying suction through the second surface causes dewatering of the suspension web and increased friction between the suspension web and the second surface.

Abstract: A method for filtering out particles from a fluid is disclosed, wherein unfiltered fluid is guided into a filter housing of a filter apparatus and filtered fluid is guided from the filter housing, and wherein a rotary filter element, which has a filter structure and is arranged in the filter housing and is rotatable about an axis thereof, is rotated at a speed which is sufficiently high that all particles passing in a fluid flow into the area of the rotary filter element are affected by its structure and are ejected therefrom, whereas the fluid passes the structure of the rotary filter element substantially freed from the particles and flows off from the filter housing.

Abstract: A high pressure automatic lime mud precoat filter cake heel removal system provides for steady kiln operation. The system provides multiple points of washing located such that washing of the entire filter can be accomplished in a short period of time. Each washing point comprises preferably two nozzles at predetermined angles to optimize washing of the filter media. The system is reciprocatively driven by a fractional horsepower gear motor connected to a torque converting coupling which is, in turn, connected to a threaded jack shaft or lead screw. The gear motor is controlled by a dual speed reversing variable frequency drive; limit switches automatically control cycling of the system in conjunction with logic circuits and sensors. This system is variably controlled so that cycle times may range optionally from approximately one to approximately five hours in length.

Abstract: A sealed shower system applies shower water to a pulp mat as it passes through a sealed chamber under a vacuum with an air supply that is externally regulated. The shower water forms a pond or film on the pulp mat. The amount of entrapped air is minimized through a downleg of a filter drum which results in maximum filtrate flow, an increased drainage rate, higher efficiency washing and a requirement for less shower water per pound of pulp. In addition, with less entrapped air in the filtrate, the length of the downleg can be reduced enabling lower building heights, smaller filtrate tanks and foam handling systems. The sealed shower system also forms part of a combined shower/hood structure that greatly reduces exhaust emissions.

Abstract: A rotary drum type dehydrator includes a rotary drum filter, a suction tube having an inlet and an outlet, said inlet communicating with inside space of the rotary drum filter, a compressed air supply tube connected to the suction tube in a portion thereof downstream of the inlet and communicating with the suction tube and an air compressor connected to the compressed air supply tube for supplying compressed air to the compressed air supply tube. Vacuum is produced in the inside space of the rotary drum filter by supplying compressed air from the air compressor to the suction tube through the compressed air supply tube. A filtered liquid receiving container is provided to collect filtered liquid and the outlet of the suction tube is disposed in the filtered liquid receiving container in such a manner that filtered liquid is jetted out of the outlet of the suction tube and is struck against a side wall of the filtered liquid receiving container or against surface of liquid stored in the container.

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

Abstract: 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 rotary drum air filter has a drive tire where a rubber tire runs against a drive rim attached to the drum co-axial therewith. A seal on the forward part of the drum rides upon a conic section on the scroll. Differential air pressure across the drum holds the seal against the conic section on the scroll. A unitary rigid manifold with a plurality of pipes is mounted for rotation about its longitudinal axis. Therefore, by rotation of the manifold, nozzles in the pipes can be exposed for adjustment and inspection. Nozzle tips in each the pipes extending from the manifold are adjustable so as to regulate the distance from the lip of the nozzle tip to the surface of the drum. For use with an atmosphere heavily laden with lint, a two-part nozzle is used so that the leading edge of the nozzle can be spaced away from the filter medium on the drum surface to accommodate a thick layer of lint which accumulated on the drum surface.

Abstract: A wet flue gas desulfurization process wherein sulfur dioxide present in flue gas is absorbed into a slurry containing a calcium compound, the slurry having sulfur dioxide absorbed therein is oxidized to form a gypsum slurry, and gypsum is separated and recovered from the gypsum slurry, which comprises the steps of dipping a part of a circulating filtering surface of a suction filter into the gypsum slurry so as to cause gypsum to adhere the filtering surface, carrying the gypsum-bearing filtering surface above the surface of the gypsum slurry, sucking out the liquid phase through the filtering surface to form a dehydrated gypsum layer thereon, and removing the gypsum layer from the filtering surface, as well as an apparatus for carrying out this process.

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: In order to greatly shorten the filter exchange time required for detachably winding a filter (20) on the opening portions (2) formed in the outer circumferential surface of a filtration drum (1), projecting or recessed annular mounting portions (6) are respectively formed near edge portions of the outer circumferential surface of the filtration drum, to have portions (7) which prevent the wound filter from moving toward the center in the thrust direction of a main shaft (4) of the filtration drum and which maintain the filter liquid-tight, and the filter (20) is firmly fixed with fastening means (22).

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 the solids toward the top of the rotation path of the paddles. The separated solids slide by gravity off of the lift paddles as they approach the top of their rotation paths and into a collection hopper and transport means that carry them away from the container. The liquids returned to the primary retained slurry within the container assist in washing the slurry for facilitating solids separation without required increase in the retained slurry volume.

Abstract: The present invention provides a self cleaning doctor blade which is a floating blade containing beveled edges or "relief gaps" comprising beveled mitered leading edges on each blade. This arrangement allows for the blades as a whole to remain free from build-up of fine particulate matter. The invention further provides a doctor blade made of replaceable units allowing for fine adjustment of blade-to-drum surface distance as well as replacement of small damaged segments rather than the whole blade.

Abstract: A device for separating a component from a fluid includes a closed carrier drum having a fluid inlet and a fluid outlet. A filter element is positioned in the carrier drum. The filter element has a top face and a bottom face and a cylindrical wall extending therebetween. A fluid duct is positioned between the top and bottom faces of the filter element along a longitudinal axis of the filter element. The longitudinal axis of the filter element is positioned coaxially with the longitudinal axis of the carrier drum. The filter element and the carrier drum are rotatable about their coaxially positioned longitudinal axes.

Abstract: A magnetic separator for purifying coolant including sludge mainly comprising needle-shaped chips for the purpose of recycling. A comb-type guide plate formed of a magnetic substance material is provided before a squeezing roller, in such a manner that convex and concave portions are in conformity with the magnetic lines of force produced by the arrangement of magnets of a fixed magnet-group cylinder stored in a rotary cylinder. Thus, magnetic flux curtains are formed between the convex portions and the rotary cylinder. Needle-shaped chips which have come as attracted sludge standing in the shape of a jet on the outer peripheral surface of the rotary cylinder are interrupted from going ahead by the magnetic flux curtains, and become accumulated sludge, and are led to lying attracted sludge on the left and right sides. Thus, the attracted sludge is prevented from stabbing a squeezing roller, and operations of extracting liquid from the sludge are continued without causing any trouble.

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: In order to create a rotating drum filter with a filter medium that is extremely fine-meshed and nonetheless has a long service life, whereby the filter medium need not be completely replaced given localized damage thereto, it is inventively proposed that the filter medium be formed of a composite element body with at least two metallic layers, namely with an extremely finely porous, outer metal layer or, respectively, stainless steel fabric that is firmly applied onto at least one metallic supporting grid layer or, respectively, onto a stainless steel fabric layer that is coarse-meshed compared thereto.

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: 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: A rotary screening device is disclosed which includes a rotating cylinder having an inlet end, an outlet end and a cylindrical wall formed at least partly from the screening surface. The cylinder is rotatably supported on wheels which are in turn mounted within a trough-shaped spray shield having sides formed from a single unitary blank of metal, and which extends about the lower radial surfaces of the cylinder wall, functioning as the screening device frame.

Abstract: A screen cylinder, screen, method of manufacture of the screen cylinder, and method of use of the screen cylinder, allow screen capacity to be maximized without sacrificing screen cylinder strength, and while achieving a clean accepts flow. A screen cylinder is constructed in a conventional manner except that at least one reinforcing ring is permanently fastened (typically by continuous or spot laser or electric beam welding, or direct resistance welding) to at least a majority of (and typically essentially all of) the land areas which separate grooves in a row from each other, at the outlet surface of the cylinder. The welds each typically have a width of about 1 to 3 mm (that is they are very small), but that width is typically at least about 75% of the width of a land area in which it is formed, and the weld has a length of at least about 50% of the width of the reinforcing ring at the weld.

Abstract: The invention relates to a process for the separation, in particular filtration of liquids and solids from solid-liquid mixtures, such as from a mineral, ore, coal or sludge suspensions of contaminated earth. The processing space of the filtration apparatus is submitted to overpressure and includes a collector container for solid-liquid mixture, a pressure filter, a discharge system and container for condensate and solid matter. The separation or filtration takes place at an overpressure and at an elevated temperature, preferably 40.degree. C. to 300.degree. C., conveniently 60.degree. C. to 200.degree. C., preferably about 150.degree. C. The pressure filter device communicates with a source for a heated medium.

Abstract: The present invention introduces a fiber suspension thickener, particularly adapted for thickening cellulose fiber. The thickener comprises a vat; a hollow filter assembly in the form of a horizontal cylindrical drum disposed within the vat, whereby the drum may be rotated by a motor around its horizontal axis, and whereby the cirumferential walls of the drum are made of a filter material; either a spray nozzle or some other supply conduit that furnishes a fiber suspension into the interior of the vat, so that the drum becomes submerged within a pool of the fiber suspension; a discharge outlet for discharging the fiber suspension on the ascending side of the rotating drum; and a turbulence creating device, that can take many forms, for creating turbulence and mixing the fiber suspension on the ascending side of the rotating drum.

Abstract: A process is provided for the treatment of suspensions comprised of oil, water and solids in which the suspension is subjected to centrifugation employing a centrifugal filter, coated with an organic powder having an index of compressibility comprised between 0 and 1.2, and wherein under the effect of the centrifugation, the suspension is subjected to an acceleration comprised between 10 and 2500 times the gravity force, that is, 100 to 25000 m/s.sup.2. The solids are retained by the coating and the centrifugate is collected. The invention is useful for the treatment of crude oil, of lubricants and oils which produce suspensions or emulsions rich in fats.

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: The present invention relates to a gully emptier comprising a container which has connected thereto a water jet or vacuum/pressure pump for conveying slurry and in which a discharge pipe which is provided with a filter at a liftable and lowerable end is arranged upstream of the connection to the suction side of a low-pressure pump, wherein a float is connected to the filter. Thanks to the float which floats on the water surface, the filter is automatically held at a predetermined depth below the water surface even when the water level changes. A manual adjustment by the operating staff is no longer required. The distance of the filter from the water surface can be accurately adjusted by using a floodable or inflatable float.

Abstract: Filter apparatus for filtering contaminants from a fluid, such as machine tool coolant, are disclosed. One filter apparatus includes a filter drum unit having a generally cylindrical open perforated support sheet with a cylindrical screen element mounted thereabout. Circumference varying mechanisms, such as turnbuckles, are connected relative to the support plate to vary the circumference of the support plate and the tautness of the screen element. A disc filter assembly having a mandrel and fluidly attached annular disc filter elements is also described. Each annular disc filter element has an inner structure with concentric ribs forming concentric grooves therebetween which are connected to radially extending grooves. A screen element is supported by the ribs so that the microscreen will not tear while allowing filtering of fluid into the grooves which are in fluid communication with the mandrel.

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 the solids toward the top of the rotation path of the paddles. The separated solids slide by gravity off of the lift paddles as they approach the top of their rotation paths and into a collection hopper and transport means that carry them away from the container. The liquids returned to the primary retained slurry within the container assist in washing the slurry for facilitating solids separation without required increase in the retained slurry volume.

Abstract: A nozzle assembly (1) for use in a separation apparatus for separation of liquid suspensions the separation including such nozzle assembly, and a method for its use. In the nozzle assembly, the outlet end of the nozzle is biasable towards the inner surface of the rotatable screening drum (7) of the separation process, and a roller or pad is provided on the nozzle to contact the drum and maintain a substantially constant distance between the the nozzle outlet and the drum surface. The outlet end of the nozzle can be swivable relative to the feed means of the nozzle.

Abstract: A rotary drum type device for separating solid particles from a liquid includes a rotary screen drum having support rods extending in the axial direction and arranged cylindrically and having a projecting portion in a radially outward end portion, and a wedge wire wound spirally on the outer periphery of the support rods in substantially crossing direction to the support rods. The wedge wire is arranged with its one side facing outward and two other sides forming a slit which widens radially inwardly between adjacent wedge wire portions and with an inward apex of said wedge wire being welded to the projecting portion of the support rods at crossing points. The rotary drum type device further includes a container containing a liquid to be treated disposed outside of the rotary screen drum, a suction device connected to the rotary screen drum for reducing pressure in the rotary screen drum, and a scraper for stripping off cake produced on the outer periphery of the rotary screen drum.

Abstract: A suction head arranged between a filtrate channel and a barometric leg of a rotating filter having at least one filter means communicating with the filtrate channel. The filtrate channel is connected to the barometric leg through the suction head. In order to ensure continuous conveyance of air bubbles brought along the filtrate, the upper internal boundary of the suction head as regards flow towards the barometric leg is nowhere located at a level above the upper internal boundary of the barometric leg.

Abstract: The present invention concerns an on-the-fly long-running rotary filtration screen device, wherein a split-flow bar and a filtration sleeve are screwed together to form a filtration bar, a filtration screen is inserted onto the cylinder on the filtration sleeve, the cylinder is equipped with round holes, the split-flow bar is equipped with two square slots facing opposite from each other, a large gear to be installed onto the split-flow bar also possesses identical square slots, so that the split-flow bar and the large gear are attached to each other by means of inserting two square keys into the two square slots and then inserting a stopping disc, the bottom of the main housing is equipped with a circular sunk slot connecting to an outlet housing, a residue-removing rod is inserted into a round hole at the lower part of the main housing and, after actuating a motor, the rotating large gear causes the filtration bar to rotate, the action of a hydraulic cylinder pressing against a round rod at the front part o

Abstract: A rotary drum type device for separating solid particles from a liquid includes a rotary screen drum having support rods extending in the axial direction and arranged cylindrically and having a projecting portion in a radially outward end portion, and a wedge wire wound spirally on the outer periphery of the support rods in substantially crossing direction to the support rods. The wedge wire is arranged with its one side facing outward and two other sides forming a slit which widens radially inwardly between adjacent wedge wire portions and with an inward apex of said wedge wire being welded to the projecting portion of the support rods at crossing points. The rotary drum type device further includes a container containing a liquid to be treated disposed outside of the rotary screen drum, a suction device connected to the rotary screen drum for reducing pressure in the rotary screen drum, and a scraper for stripping off cake produced on the outer periphery of the rotary screen drum.

Abstract: Described is a water treatment device which comprises a) a treatment tank with an inlet and an outlet for the treatment water, and a rotating drum used for forced generation of a primary current and a secondary current accompanying the primary current in the treatment water in the treatment tank. The device can be used for the collection and removal of oil and/or other suspended matter in the treatment water through the rotating action of the rotating drum.

Abstract: A rotary screening device is disclosed which may be advantageously used to increase the solid content of influent. The apparatus includes a rotating cylinder having an inlet end, an outlet end and, depending on the material to be screened, a cylindrical wall formed at least partly from a screening surface, such as a woven wire mesh screen. The cylinder is journalled for rotation about its central axis, which may be either in a horizontal position or inclined up to 40 degrees from horizontal towards either the inlet or outlet end. Each end of the screening cylinder has its lowermost portion covered to restrict outward movement of the influent from the cylinder and maintain a minimum layer of retained solids therein.

Abstract: A fractional filtration apparatus, used for obtaining cutting oils fractionally cleaned by using one filtration apparatus so as to reuse the separated cutting oils in accordance with the types of machining operations, includes a plurality of liquid tanks for fractionally storing the cleaned cutting oils, a filtration target cutting oil storage tank for temporarily storing a filtration target cutting oil charged through a charge port, rotatably driven filtration drums, dividing the liquid level of the cutting oil and being pivotal in the filtration target cutting oil storage tank, each drum having a side-surface opening in at least one surface thereof in order to let a filtered cleaned cutting oil flow into the cutting oil tanks, and each drum being provided with filters of different mesh sizes, injection nozzles for reversely washing the filters provided on the outer circumferential surfaces of the filtration drums, and dip-up members, disposed at a predetermined intervals, for continuously conveying the cutt

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 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.