Abstract: The rotary flat membrane separation apparatus comprises: a plurality of hollow rotary shafts; a plurality of rotary flat membrane disks mounted on each of the plurality of hollow rotary shafts at regular intervals, the plurality of rotary flat membrane disks mounted on adjacent two of the plurality of hollow rotary shafts being alternately arranged side by side in equal intervals; and a plurality of collars, each of the plurality of collars being arranged between adjacent two of the plurality of rotary flat membrane disks mounted on each of the plurality of hollow rotary shafts. The apparatus is characterized in that a diameter of the collars is between 0.18-0.34 times a diameter of the rotary flat membrane disks. Thus, the effective membrane area can be as large as possible while preventing the vibration of the rotary flat membrane disks caused by the rotation.

Abstract: Apparatus for cleaning a filter cloth in a filtering device with a rotatable drum having an inlet for the liquid to be filtered. The drum has in its circumferential surface openings through which the liquid to be filtered is conducted in a filtering direction out of the drum for filtering through a filter cloth. The cleaning apparatus includes at least one spray nozzle which is adapted to spray cleaning liquid onto a portion of the filter cloth in a direction opposite to the filtering direction. Moreover the apparatus comprises a driving device for providing a reciprocating motion of the spray nozzle. The driving device has a coupling which is adapted to transform the rotary motion of the drum into the reciprocating motion of the spray nozzle, with such a ratio that the rotary motion of the drum and the reciprocating motion of the spray nozzle are out of phase with each other.

Abstract: The invention encompasses a system for the cross flow filtration of fluid media using membranes. The system has in a first embodiment two shafts, only one of which is hollow, with each shaft running through an axis of its given disc. The disc of each shaft is positioned offset with respect to one another to have a region of overlap therebetween. The region of overlap serves to enhance the efficient operation of the system by reducing the degree of settling of retentate on the disc of the hollow shaft, because of the wiping or cleaning effect achieved upon rotation of each shaft by a drive system. In another embodiment, both shafts are hollow.

Abstract: A fastening strip for fastening a filter cloth against the filter surface of a solid-liquid separator. The solid-liquid separator comprises at least one filter element provided with a fastening groove for the fastening strip. The filter cloth is fastened to the filter element by means of the fastening strip, whose fastening portion is inserted into the fastening groove. The fastening strip is an elongated piece having a substantially T-shaped cross section and comprising a fastening portion and a support portion transverse to the fastening portion. The support portion provides a protective edging that extends to a distance from the edges of the fastening groove.

Abstract: A portable water treatment unit is provided for purifying contaminated water, especially in the aftermath of a natural disaster that compromises a region's water supply. The treatment unit is configured to treat water drawn into the unit. The treatment unit comprises an inlet connected to a pump. The pump outlet is connected to a solid separator for removing larger particles such as sand and silt. A series of filters is connected to the pump outlet, the filters being arranged from coarsest to finest. The filters remove smaller particles from the water. The water from the filters eventually flows into an ultraviolet light disinfection unit configured to purify water by emitting ultraviolet light thereon. An outlet of the UV light disinfection unit is configured to expel purified water for drinking and other uses. Pressure gages are provided for monitoring the pressure drops across the filters.

Abstract: A method for separating magnetic particles dispersed in a fluid by magnetic attraction, characterized in that an object fluid in which magnetic particles are dispersed is passed through a magnetized rotary tube, magnetic particles are made to adhere by magnetic attraction to magnetized surface in the tube, the flow of the fluid is suspended before the capacity of magnetic attraction of the tube lowers, the magnetized surface is demagnetized, an exhaust fluid for exhausting magnetic particles in the tube is made to flow under pressure through the tube, the exhaust fluid mixed with magnetic particles is discharged, and the magnetic particles are separated from the exhaust fluid.

Abstract: An arrangement in a circulation lubrication system includes a lubricating oil tank, pressure pipe lines for supplying oil to parts that are to be lubricated, return pipe lines for returning the oil from the parts that are to be lubricated to the oil tank, and a mechanism for pumping oil into the pressure pipe lines and maintaining a desired state of lubrication. The lubricating oil tank has a rotationally symmetric structure; and a return duct, positioned at the center axis of the rotationally symmetric structure, is configured to extend below the surface of the oil in the lubricating oil tank. A return flow through the return duct passes through a dividing element to a mechanism configured to separate impurities from the oil.

Abstract: An apparatus for simultaneously processing a plural number of samples, each of the samples including a fluid containing particulate matter. The apparatus is useful in cytology to collect a uniform monolayer of cells from a biological fluid. Each of a plural number of processing assemblies (corresponding to the plural number of samples) comprises a container, an agitator rotatable relative to the container for contacting and dispersing particulate matter in the fluid, a filter assembly including a filter for collecting particulate matter, and a pump for moving the fluid through the filter. Each container is supported on a separate container receiver, and each pump is engaged by a separate pump engagement. A rotary driver effects relative rotation of the agitators and their respective containers simultaneously to mix the samples in the containers.

Abstract: An object of the present invention is to provide a compact solid-liquid separator having a high water surface loading which can limit pollutant's outflow even when flocs are insufficiently pelletized.

Abstract: A method and an apparatus for the purification and treatment of liquids which are used for cooling and/or lubricating and contain impurities of metal and other materials, particularly for separating scale from the process water of cooling cycles in the metallurgical industry, wherein the liquid to be purified flows through intermediate spaces between plates arranged parallel next to each other in a container, and wherein the plates are arranged horizontally and are moved upwardly and/or downwardly transversely of the flow direction of the liquid. The solid particles are removed from the process water by sedimentation on the plates and additionally by a magnetic force which emanates from the upper sides of the plates.

Abstract: The process, particularly useful in blood oxygenators, whereby a differential velocity between a fluid and a diffusing surface of hollow tubes by a rotating member such that the boundary layer is perturbed enhancing the coefficient of mass and thermal transfer. The differential velocity is achieved by rotating hollow tubes containing one fluid in a second fluid, or by apposing a rotating member to the surface of the stationary hollow tubes.

Abstract: The process, particularly useful in blood oxygenators, whereby a differential velocity between a fluid and a diffusing surface of hollow tubes by a rotating member such that the boundary layer is perturbed enhancing the coefficient of mass and thermal transfer. The differential velocity is achieved by rotating hollow tubes containing one fluid in a second fluid, or by apposing a rotating member to the surface of the stationary hollow tubes.

Abstract: Oil spill polluted water is conducted under pressure in sequence through arator devices to collect and burn a polluted water mixture having its oil concentration increased by extraction of water therefrom during axial flow through the separator devices. Such water extraction is effected by sequential radial outflow through oil flow blocking filter walls of the separator devices in response to rotation thereof.

Abstract: A control device for at least two partial fluid ducts comprises a common fluid supply duct and a common fluid removal duct. The fluid supply duct is connected with the fluid removal duct by at least two partial fluid ducts. A filtering device, a valve device each having a blocking element, and a stop valve are each located in a corresponding partial fluid duct. Each blocking element of the valve device operates in such a way that the blocking element can be moved between a first (open) position, in which the fluid flowing through the partial fluid duct in which it is located is filtered, and a second (closed) position, in which the fluid is filtered in the other partial fluid duct, whereas at the same time the filtering device provided in the partial fluid duct in which it is located is washed by the fluid flowing in the reverse direction. Furthermore, each blocking element can be brought from the first position into the second position and vice-versa by rotating the blocking element.

Abstract: Rotary disc filtration devices and filtration processes using those devices are disclosed. The devices have one or more fluid filtration gaps into which fluid to be filtered into permeate and retentate is placed. Each fluid filtration gap is defined by a disc and a filter, one of which rotates with respect to the other. The filter is carried on a filter member. The discs and interleaved filter members may be suspended from the top of the device, the top may rest on a vessel containing the fluid to be filtered, the discs may be attached to a single shaft for rotation, and the filter members may be suspended from a sleeve around the shaft, which sleeve keeps the filters centered with respect to the discs. Removal of the device's top removes the discs and filter members together, facilitating maintenance. Each filter member may have a peripheral lip and the lips of adjacent filter members may be sufficiently close to one another to substantially restrict the flow of retentate out of the fluid filtration gap.

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: A rotating filter including a container (11) for a liquid or suspension to be filtered and a rotor structure (17, 21, 22, 25, 26) being provided at its outer periphery with a filter medium arranged in the shape of at least one circular ring (33) having its center in the rotational axis of the rotor structure and an extension in the radial direction substantially from the outer circumference of the rotor structure. Removal and discharge means (73, 93) is arranged radially outside the outer periphery of the rotor structure, extends substantially thereto along the radial extension of the filter medium and is adapted to remove filter cake material from the filter medium and lead it radially outward towards the radially outer limit of the filter medium.

Abstract: A shale shaker has been developed which, in one aspect, has one or more upper screens and one or more lower screens with an upper screen at a discharge end of the shale shaker and a lower screen disposed to receive material discharged from a discharge end of one of the upper screens. In one aspect a portion of a lower screen underlies the discharge end of the upper screen. In another aspect a solid flowback pan prevents material falling through the upper screen(s) from falling onto the lower screen(s); and, in another aspect, the pan prevents material on a top of the lower screen(s) from falling into a bottom sump of the shale shaker which receives material which has fallen through the screen(s).

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

Abstract: An interior wedge wire drum screen is mounted wholly within an exterior drum screen of narrower wedge wire spacing, and both are mounted to a frame and caused to rotate about a common central axis. One end of the outer drum is open and the other is closed by a disc-shaped drum head. The inner drum has an open end which is spaced inward of the open end of the outer drum. The waste water is presented to the surface of the inner drum screen by a waste water infeed which employs a vertical column. The column extends upwardly of an inlet and has a gradually increasing cross-section for reducing the flow of velocity of the waste water. A horizontal trough extends along the axis defined by the drums and communicates between the top of the column and a tray. The edges of the tray terminate in weirs which are parallel to the sides of the inner drum. Water flows in a smooth sheet over a weir to impact the sides of the inner screen with low velocity.

Abstract: The invention relates to a filter device for extruders and injection-molding machines, the screen elements being formed by a candle filter and, if required, by a plurality of candle filters, which are arranged in the circumferential direction on the screen plunger, extending parallel to the longitudinal axis of the screen plunger, and are flowed through from the outside inward for filtering purposes and from the inside outward for backwashing purposes.

Abstract: A multi-stage pressure diffuser is provided for treating paper pulp or similar comminuted cellulosic fibrous material. Two different subvolumes are defined within the annular screen of the pressure diffuser by a tubular baffle hung from adjacent the top of the vessel, and a transverse wall near the middle of the vessel. Wash liquid is introduced into the top stage, extracted liquid passes through the bottom of the baffle, and is removed through a liquid outlet at the top of the vessel. That removed liquid is then reintroduced into the bottom stage as wash liquid, and the extracted liquid from the bottom stage is discharged from the vessel at the bottom. The screen assembly may be blanked at the area of the transverse wall dividing the subvolumes from each other, in order to minimize the possibility of mixing of the extraction flows in the different stages.

Abstract: Apparatus for separating waste liquid and solid material comprises an upwardly inclined passage containing an auger for conveying the solid waste material upwardly along the passage, with an inlet opening at a lower end of the passage for receiving a mixture of waste liquid and solid material into the auger, a drainage opening at the lower end of the cylindrical passage for draining liquid from the solid waste conveyed by the auger, and a compactor for receiving the solid material fed upwardly by the auger and compacting the solid waste material. An extruder receives and extrudes the compacted solid waste material from the compactor, and may be arranged to convert the compacted material into pellets.

Abstract: An interior wedge wire drum screen is mounted wholly within an exterior drum screen of narrower wedge wire spacing, and both are mounted to a frame and caused to rotate about a common central axis. One end of the outer drum is open and the other is closed by a disc-shaped drum head. The inner drum has an open end which is spaced inward of the open end of the outer drum. The waste water is presented to the surface of the inner drum screen by a waste water infeed which employs a vertical column. The column extends upwardly of an inlet and has a gradually increasing cross-section for reducing the flow of velocity of the waste water. A horizontal trough extends along the axis defined by the drums and communicates between the top of the column and a tray. The edges of the tray terminate in weirs which are parallel to the sides of the inner drum. Water flows in a smooth sheet over a weir to impact the sides of the inner screen with low velocity.

Abstract: A filter sector for a filter disk of a rotating filter having a plurality of such filter sectors includes two spaced plate-shaped elements formed from a relatively thin material and defining main planes. Protrusions outwardly extend from the main planes and are shaped out of the material of the plate-shaped elements. The protrusions are adapted to keep a filter cloth at a distance from the main plane. Interior bulbs shaped out of the material of the plate-shaped elements extend from the interior sides of the plate-shaped elements. The protrusions and the interior bulbs have a material thickness substantially corresponding to the material thickness of the main plane. The interior bulbs are adjoined at engaging contact surfaces to provide strength and torsional rigidity to the sector.

Abstract: The specification relates to a filter candle for filtering highly-viscous fluids, e.g. polymer melts, and in a number of parts which can be dismantled and comprising a filter stocking permanently connected to a cap, the two parts being replaceable together. Owing to the complete absence of screwed components, the filter candle can be made very small. It is also easier to take apart and clean when clogged by solidified residues of melt. Individual parts can easily be replaced when unserviceable. The complete filter candle has a plug connection to a baseplate, from which it can rapidly be separated.

Abstract: A rotating filter apparatus (10) has a stack of porous filter disks (22) attached to a vertical, rotatable hollow shaft (24) and located within a chamber (32), the shaft (24) having a plurality of openings (26) therein to the hollow bore of the shaft (24). Unfiltered fluid is introduced to the chamber (32) under pressure in a tangential entry port (34) in the same direction as disk (22) rotation. Clarified fluid passes through the disks (22) to form a filtrate that flows down the shaft (24), while the unfiltered fluid and the solid particles, or sludge, descend in the chamber (32) to a tapered section (18). Non-fluid transfer and fluid transfer seal assemblies (14, 20) comprise bearings (54, 102, 108), seals, and associated parts upon which the shaft is properly aligned, balanced, and centered. The seal assemblies (14, 20) include seals positioned about the shaft (24) to form a boundary that isolates the bearings (54, 102, 108) from the unfiltered fluid or filtrate.

Abstract: The present invention relates to a method and apparatus for discharging a disc filter. The method and apparatus are excellent for handling fiber suspensions in the pulp and paper industry. In earlier known means, the filter cake thickened on the filter surfaces of the disc filter is detached by means of water or compressed-air jets and the cake allowed to freely fall to an axial chute disposed below the shaft level of the filter, wherefrom the pulp most usually is transferred by means of a screw conveyor. The pulp, however, easily clogs the inlet opening of the chute, whereby pulp material accumulates in the space between the discs with harmful consequences.

Abstract: A method of separating blood plasma from particles including blood cells, in the blood, includes the steps:(a) providing a membrane with holes therethrough of a size to pass the particulate, and supplying blood to one side of the membrane,(b) moving the membrane at sufficiently high velocity that shear conditions created in the blood adjacent the membrane cause particles in the blood to move or remain away from the surface of the membrane and from the holes,(c) creating a pressure differential across the membrane sufficient to cause plasma to pass through the holes from said one side of the membrane to the opposite side thereof,(d) the holes being allowed to reduce in cross-sectional area as by protein collection on the membrane at the holes, or by expansion of the membrane material, and the holes maintained sufficiently open, by virtue of their original size, to continue to pass the plama therethrough.

Abstract: A tubing or harness set is provided having first and second portions sequentially applicable to a microprocessor-controlled hemapheresis instrument for generating platelet concentrate. The first portion includes a reservoir having dual compartments and a separator. The instrument and the first portion of the harness set alternately collect whole blood from the donor and reinfuse packed cells into the donor while simultaneously continuously separating whole blood into packed cells and platelet-rich plasma. Upon collection of a predetermined quantity of platelet-rich plasma, the donor is disconnected form the phlebotomy needle of the harness, the first harness portion is removed from the instrument and the second harness portion is applied to the instrument. The second harness portion includes a separator for receiving platelet-rich plasma from the collection container of the first harness portion and separating such plasma into platelet concentrate and platelet-depleted plasma.

Abstract: A concentrator for concentrating the fine solids of a liquid feed suspension has a shell within which there is a bundle of microporous fibers. Pressurized feed suspension is introduced through an inlet and passes over the external walls of the fibers with the clarified liquid being drawn from the lumens of the fibers and the concentrated feed being discharged through an outlet. The solids retained within the shell are removed by first applying a pressurized liquid and then applying a gas at a pressure sufficient to ensure that the gas will pass through the larger pores of the fibrs to remove the solids from the shell through the outlet to an external collection point. The fibers are enclosed within a variable volume diaphragm located within a diaphragm holder by spaced plugs. The volume of the diaphragm is altered by varying the pressure of a fluid introduced through the inlet to the space between the diaphragm and the diaphragm holder.

Abstract: An apparatus for separating multiple phases of solids or fluids includes an exterior housing having an interior chamber. A plurality of porous filter disks is positioned within the interior chamber and have a common central passage. The disks are capable of rotating around the central passage. An inlet introduces at least one fluid phase with or without a solid phase into the interior chamber near the central passage of the disks. A centrifugal force is created within the interior chamber to form a pressure differential across the disks to draw the fluid through the disks away from the central passage, while propelling any solids present in the interior from the central passage toward the exterior housing. The fluid drawn through the disks is collected at the periphery of the disks.

Abstract: A rotary disk filter element for a beverage filter for biological filtration. The filter element includes a closed base plate that is in the form of a ring-like member and on which is supported a filter fabric, with a support fabric being interposed between the base plate and the filter fabric. The filter fabric is secured to the base plate between an outwardly disposed retaining member and an inwardly disposed collar member. The collar member is provided with a supply opening for a wash fluid, especially a water/air mixture that is flushed through the filter fabric, counter to the direction of filtration, for removing filter residue for the general cleaning of the filter fabric. The filter fabric is secured to the base plate and to the support fabric at a plurality of point locations. This divides the free support or clamping lengths of the filter fabric into a number of relatively short regions that prevent the filter fabric from being overstretched and bulged during flushing.

Abstract: In a filtration apparatus for fluids and liquids having an external vessel, in particular a centrifuge tube and a filter unit disposed in the liquid, the medium to be filtered is under excess pressure and in contact with the filter element of the filter unit and for the static membrane filtration on the outer side of the filtration unit facing the vessel bottom a filter membrane is arranged with the filtration-active layer towards the outside.

Abstract: Fast filtering apparatus, particularly for biological liquids.It comprises in combination:an injection device equipped with a cylindrical reservoir, whose bottom is sealed by a porous pellet and whose top is sealed by a piston displaceable in translation in the cylindrical reservoir, the latter containing the liquid phase to be filtered;a filter support device comprising a cylindrical chamber, whose upper part is sealed by a porous pellet serving as a support for the actual filtering material;a device for bringing about the fast, temporary contact between the injection device and the filter support device;an electronic control assembly controlling each filtering operation, by simultaneously acting on the contacting device and on the mechanical means for the translation of the piston.

Abstract: Suspended solid particles are separated from a fluid flow by dividing the flow into partial fluid flows in flow channels having an upper filter surface travelling upstreams and a lower filter surface travelling downstreams, controlling the flow velocity in the channels such that the flow is turbulent but at the same time low enough to allow for sedimentation of the suspended material to form a clear top layer off so that more than half of the liquid fed to the channel is filtered through the upper filter surface, suctioning less than half of the liquid fed into the channel through a sediment formed on the lower filter surface, and finally removing the sediment from the lower surface.

Abstract: A filter consisting of two endless belts of filter material having runs pressed together, of means pressing a run of one belt against the adjacent run of the other, and of a feed device for introducing the slurry between the runs.