Abstract: A filter assembly for filtering contaminants from liquid. A housing has a filtering chamber and an inlet port and an outlet port communicating with the chamber for flow of liquid therethrough. Filter media is located in the filtering chamber for filtering contaminants from liquid flowing through the filter media to the outlet port. A sump region is provided in the filtering chamber at the bottom thereof below the inlet port. Contaminants in the liquid entering the chamber from the inlet port tend to gravitate toward the sump region for collection. A separator member is located in the filtering chamber below the inlet port. This separator member substantially separates the filter media and sump region, and gravitating contaminants gravitate from the inlet port to the separator member. The separator member provides for communication of the gravitated contaminants into the sump region but tends to trap those contaminants in the sump region.

Abstract: A processing system separates a cellular rich suspension into a cellular first constituent and cellular-free second constituent. The system includes a separation zone that receives the cellular rich suspension and discharges the first and second constituents. The system coordinates the flow of cellular rich suspension into the separation zone with the flow of the cellular-free second constituent from the separation zone to get a desired nominal separation efficiency. The system also recirculates the cellular first constituent back into the zone. By continuously recirculating the cellular first constituent back into the separation zone, the system is can get and maintain a desired volume of the first constituent, despite the volume of cellular rich suspension that is processed.

Abstract: A method and apparatus for enhancing knot transport in a knot drainer has a provision for decreasing tangential velocity of the feed slurry in the inlet chamber, a hydrodynamic force reduction provision in the screening chamber, and a provision for increasing the ratio of circumferential friction forces to axial friction forces in a housing extension above the screening chamber. This drastically reduces frequency of knot transport interruptions which would otherwise occur in the knot drainer, thereby improving knot drainer performance efficiency.

Abstract: Method and apparatus are provided for machine separation of blood into blood components, wherein a preselected fluid such as anticoagulant is added to at least two different locations through the fluid flow path of the set, in order to promote the different functional characteristics in different blood components. The method results in reduced incidence of citrate reaction in the blood donor and increased platelet yield in platelet rich plasma collected during the procedure.

Abstract: An improved conveyor system for machine tool cleaning applications comprises a sump internal to a machine tool, a recirculating system in fluid communication with the sump, a hinge belt conveyor, portions of which are interposed between the sump and the recirculating system for removing coarse solids from the fluid, and a fine filter interposed between the sump and the recirculating system for removing fine solids from the fluid.

Abstract: Procedure for dewatering sewage sludge comprising the steps of subjecting pumpable sludge to chemical pretreatment with addition of a flocculation agent, pre-dewatering the chemically pretreated sludge by gravity filtration and conveying the pre-dewatered sludge by gravity, dewatering the pre-dewatered sludge by pressure filtration to form a sludge cake, crumbling the sludge cake to obtain sludge cake pieces, and drying the sludge cake pieces. After the dewatering step, so hard sludge cake is formed that after crumbling the sludge cake pieces are obtained which maintain their shape in accumulated consistency. A plant for the execution of the procedure is disclosed.

Abstract: Method and apparatus for machine separation of blood and blood components that utilizes improved administeration of anticoagulant to the red cell suspension output. Anticoagulant is added to incoming whole blood in an amount sufficient to prevent clotting of the whole blood in the flow path upstream of the blood component separator, but in an amount insufficient to prevent clotting of the red cell suspension created by the separator. Anticoagulant is added to the red cell suspension downstream of the separator in order to prevent clotting. By adding an additional aliquot of anticoagulant to the red cell suspension, the amount of anticoagulant added to whole blood before separation can be reduced or eliminated, resulting in an increase in platelet yield during the blood component separation step.

Abstract: A solid and liquid separator with a liquid filter, having an inner cylinder and an outer cylinder combined together to rotate synchronously to let solids naturally separate from liquid, and a filter for the separated liquid to be further filtered and the separated solids to be collected together away.

Abstract: The present invention relates to a method and an apparatus for washing pulp according to which method the pulp is supplied onto a movable liquid-pervious support surface to form a substantially continuous layer; and washing liquid is supplied to the pulp layer and passed in several successive washing phases through different areas of the layer in such a way that the washing liquid gradually flows in the opposite direction compared with the flow direction of the pulp layer. According to the invention the washing liquid is divided in two or more partial flows which pass alternately through different washing phases in such a way that the washing liquid which in one phase has passed through the pulp layer flows past at least the washing phase preceding it in the flow direction of the pulp layer. The apparatus of the invention preferably includes a rotating cylinder having a casing surface of which serves as the liquid-pervious support surface for the pulp.

Abstract: Apparatus for continuously removing from the mother liquor the crystals contained in a suspension of crystals in the mother liquor and for washing the crystals with a washing liquid, comprising a closed cylindrical chamber, feed devices for the suspension of crystals, discharge devices for removing the disintegrated crystal bed, feed devices for washing liquid, filter devices in the form of a flat ring for extracting mother liquor from the suspension supplied, while retaining crystals, transport devices in the form of rotating blades which are fitted in the cylindrical chamber above the filter devices and stator blades above the rotating blades being able to move backwards and forwards over a certain stroke in the axial direction between the filter devices and the stator blades fitted at a distance above the filter devices.

Abstract: The invention is a screening device suitable for screening a liquid material having solid matter suspended in it, which comprises a number of sets of discs, the discs of each set being rigidly mounted on a shaft, with the discs on each shaft being separated from one another axially, means mounting the shafts about parallel axes, with the discs of adjacent shafts being interleaved with one another and means to cause the shafts to rotate independently in the same rotational sense such that successive shafts rotate progressively faster to cause the solid matter suspended in the liquid material to be moved in a direction from the slowest shaft to the fastest shaft. The device is used particularly in sewage processing plants.

Abstract: An apparatus for processing muddy water containing particulate matter comprising a tank for receiving the particulate matter, and takeout means for receiving the particulate matter settling down in the tank and then conveying the received particulate matter to the upper portion of the tank, wherein the takeout means includes a belt conveyor provided with a first conveyance section disposed on the bottom of the tank and receiving the particluate matter to convey the received particulate matter to a predetermined portion in the tank and a second conveyance section for conveying the particulate matter conveyed by the first conveyance section upward in the tank while sandwiching the particulate matter between a pair of endless belts.

Abstract: Process and installation for the separation of the constituents of a suspension.The installation comprises a self-cleaning filter (19), a heater (23), a centrifugal separator (25) and a belt filter (51) for filtering the solid sediments from separator (25).

Abstract: Separation of vaporizing oil and smoke to clean polluted air. That is, by inducing the particles to directly impact the revolving filter drum, and some small particles to be intercepted in the meshes and some large particles to collect in the groove means, due to the rotation of blower blades. Clean air will go upwards through the revolving filter drum through a pressure effect. Automatic cleaning of the polluted revolving filter drum and groove means is achieved by rotation of an axial fan causing a centrifugal effect.

Abstract: Solid particles with entrained liquid are removed from a filtration tank and deposited on a chute inlet to a pair of rollers. One roller is pressed toward the opposite roller such that the solid particles pass through the nip of the rollers and the liquid is squeezed therefrom. The solid particles are scraped from the rollers on the outlet side of the deliquifier for collection. The liquid is collected on the inlet side of the rollers for reuse.

Abstract: The present invention relates to a method and an apparatus for washing pulp according to which method the pulp is supplied onto a movable liquid-pervious support surface (2) to form a substantially continuous layer (7); and washing liquid is supplied to the pulp layer and passed in several successive washing phases through different areas of the layer in such a way that the washing liquid gradually flows in the opposite direction compared with the flow direction of the pulp layer. According to the invention the washing liquid is divided in two or more partial flows which pass alternately through different washing phases in such a way that the washing liquid which in one phase has passed through the pulp layer flows past at least the washing phase preceding it in the flow direction of the pulp layer. The apparatus of the invention preferably comprises a rotating cylinder (1) the casting surface (2) of which serves as the liquid-pervious support surface for the pulp.

Abstract: A liquid filtration device includes a tubular container having an end wall at one end with an emptying orifice therein and a detachable cover closing the opposite end. A filling orifice is disposed in the container adjacent to the cover and a fixed filter is secured in the container immediately adjacent the emptying orifice. A movable filter is disposed in the container for movement between the cover and the fixed filter by means of an operating component connected to the movable filter and extending outwardly of the container.

Abstract: In an apparatus for dewatering sludge the sludge to be dewatered is continuously fed to a pre-dewatering stage and is subsequently transferred to an enclosed sludge chamber volume, which is intermittently moved past stationary pairs of pressure-applying plates. The pre-dewatering stage is consituted by a stationary dewatering container which serves also as a buffer between the means for the continuous fooding of sludge and the means for a discontinuous and intermittent transfer of the sludge to the sludge chamber volume. Owing to that design the plant has a low structural expenditure and is operable at a high dewatering rate.

Abstract: Using a membrane separating device to remove cell-free fluid from a suspension of cells to preconcentrate cells in the suspension prior to processing in a centrifuge.

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 system of continuously and efficiently separating liquid from sludge is disclosed which includes two parts, the mixer conditioner and the rotary drain. The two parts are virtually always used together. The mixer conditioner may include an adjacent vertical receiver which may serve to extend residence time. The receiver, if used, is connected at the bottom to the tangential inlet line to the mixer conditioner. This inlet line provides the means for circulation therethrough the watery sludge to which has been added a flocculant in a gentle manner so as to cause mixing while not causing shearing. A slow moving horizontal impeller operates to maintain the spiraling motion initiated at the tangential inlet. The outlet, also tangential, delivers to the rotary drain. The rotary drain is a compartmentalized cage that is decreasingly baffled from compartment to compartment.

Abstract: A two stage liquid filtration apparatus including a first pre-filter stage for removing heavy small particulate contaminants from the liquid with a first housing defining an inlet and an outlet and a screening means dividing a central chamber therethrough to allow contaminants like sand to fall downwardly therefrom for pre-filtration thereof. The liquid is then carried to a second stage filter which is a rotary filtration means for further removing contaminants through a rotatable cylinder with internal baffles for discharging the waste at one end of the cylinder and discharging the filtered water downwardly about the periphery of the cylinder. The cylinder is formed of a filtration media. A liquid reservoir is positioned below the cylindrical filter which includes a tank means for receiving filtered liquid and a heating means for controlling the temperature thereof.

Abstract: An apparatus for continuously separating intermixed solids and liquids from industrial waste. The device includes an elongated conduit having an inlet and outlet and where the interior of the conduit forms a mixing chamber. The industrial waste is pumped into the inlet of the mixing chamber and a polyelectrolyte compound is introduced into the mixing chamber at at least two spaced locations along the conduit. The outlet of the conduit is then passed across both a stationary screen and then into a rotating drum separator, which, together, remove the water from the waste material.

Abstract: Apparatus for dewatering. The effluent to be dewatered is passed through a hydrocyclone. The underflow of the hydrocyclone is confirned by a shroud to convert horizontal components of spray into vertical components. The effluent is driven forcibly vertically onto an endless driven filter belt.

Abstract: Hot flue gas, such as the flue gas from a fossil fuel furnace or a waste incinerator, to be scrubbed to remove acidic gas, such as sulfur dioxide and hydrogen chloride gas, and particulates, such as fly ash, is passed to a primary drying chamber and contacted therein with a spray of droplets of an absorbent liquid containing particles of an alkali or alkaline reactant. The droplets are partially dried in the primary drying chamber to a tacky condition before reaching a foraminous collecting member extending through a lower portion of the primary drying chamber wherein it collects as a moist, porous mat. As the flue gas continues to flow through the mat depositing on the collecting member, the mat serves as a filter for removing particulates, including fly ash, in the gas and the remaining sulfur oxides in the gas react with unreacted particles of reactant and reactive ingredients of the fly ash collected in the mat.

Abstract: A two-stage filter apparatus for removing particles entrained in a liquid wherein the liquid is initially presented to the first filter stage having an endless filter belt for removal of a portion of the entrained particles to result in a liquid having a decreased density of particles. This resulting liquid of decreased density is then presented to a cyclone filter in the second filter stage and divided into two parts, one part which is substantially free of any particles which is then available for its intended use and a second part that is presented to another endless filter belt and returned serially to the first filter and then the second filter stages for subsequent filtering of particles.

Abstract: An improved filter system is disclosed for filtering a liquid media such as molten metal, e.g., molten aluminum and aluminum base alloys, the system comprises a housing containing a first chamber into which molten metal to be filtered passes, a second chamber in the housing, a filter cloth that separates the first chamber from the second chamber, a high specific flow static filter in the second chamber, and means for moving the filter cloth in the housing to expose fresh surfaces of filter cloth to the metal being filtered to inhibit clogging of the filter cloth means by buildup of the filter cake and maintaining a constant high level of filtration efficiency.

Abstract: A technique for dehydrating a wet sludge. Wet sludge is subjected to a preliminary dehydration by gravity dehydration or the like. It is then pelletized by a pelletizer, and obtained pellets of the sludge are subjected to compression dehydration with a pair of endless filter fabrics.

Abstract: Drill cuttings, and similar slurries or mixtures oily solid particles, are treated by a dryer apparatus which vaporizes the liquid and discharges relatively large solid particles for disposal. Vapor and entrained solid fines are conveyed from the dryer to a condenser and then to a rotary drum vacuum filter having a precoated filter media disposed thereon. The solid fines are filtered by the filter media comprising diatomaceous earth or perlite and the clarified condensed liquid is conveyed to separator means for separating oil, water and any other liquids present. The filter media stripped from the filter and contaminated with entrapped solid fines is conveyed through the dryer means and disposed with the solids particles being discharged from the dryer.

Abstract: A method of filtering coolant for a central coolant system supplying clean coolant to a plurality of machining stations. The method simultaneously filters the coolant in a single tank through both a perforate drum filter and a paper filter to obtain clean coolant of two distinct clarity levels. The coolant of enhanced clarity resulting from the operation of the paper filter either can be supplied to a machine requiring such coolant clarity (e.g., a gun drill) or can be used as a "polishing filter" to remove fines from the coolant in the central system.

Abstract: A water purification system having a first pressure vessel containing a reverse-osmosis filter and a second separate pressure vessel containing an activated carbon prefilter operatively connected in series and upstream of the first pressure vessel by means of a common header. The activated carbon prefilter includes a particulate trap upstream of the activated carbon to trap sediment carried in the unpurified water. The particulate trap is compressible under operational water pressures attained in the system when the trap becomes clogged with sediment, which serves to crack or break away from the surface thereof particle accumulations clogging the trap, permitting flow to continue through the trap into the activated carbon and, subsequently, through the reverse-osmosis filter element.

Abstract: Apparatus for treating emulsions and industrial waste waters includes a reaction container in which the fluid to be treated is treated with a chemical mixture and a settling container in contact with the same in which the settling precipitate separates and settles from the fluid. Devices for discharging the precipitate from the container and devices for dividing the chemical mixture among the fluids to be treated are also provided.

Abstract: A sludge remover and processor includes a first vessel holding cleaning liquid and a second, phase separating vessel. Cleaning liquid from the first vessel is sprayed against a dirty surface. A vacuum pump keeps the second vessel upper region at a partial vacuum so cleaning liquid and dislodged matter from the dirty surface is sucked into the second vessel. Solids and liquid are pumped from the second vessel into a solids separator where the larger solids are removed for disposal and liquid is pumped into a centrifuge which removes fine solid particles. The fine particles are mixed with a bulk solidification medium for disposal. Oil collection in the vessels is enhanced by the partial vacuum which lowers the boiling point so tiny bubbles are formed to aid separation of the oily and non-oily phases. Passing the liquid through a centrifuge also aids separation of the oily and non-oily phases in the first vessel.

Abstract: A filter of the type including a filter drum mounted within a settling tank containing a liquid to be filtered, with filtering flow drawn through a filter media on the outer surface of the drum, in which a fluid connection to the liquid circulation system is established by interfitting of tube sections as the filter drum is lowered into the tank at installation. Guiding members are included to properly position the drum as it is lowered to insure the tube sections move together as the filter drum is lowered. A valving arrangement is disclosed in one embodiment for isolating the particular drum filter from the circulation system upon removal. In another embodiment, an arrangement is utilized for producing intermittent rotation of the drum by engagement with the flights of a drag-out conveyor.

Abstract: An apparatus for dehydrating protein containing aqueous slude, e.g., sludge produced in slaughter houses, which comprises an agglomerator positioned above a filter device, the agglomerator having a bottom wall, a cylindrical outer wall, a cylindrical inner wall, the inner wall and the outer wall providing an annular space therebetween, a sludge inlet duct and a steam inlet duct, the sludge inlet duct and the steam inlet duct communicating with said annular space substantially diametrically opposite each other. The steam is injected in such a way that shear forces will be created in the liquid sludge, thus resulting in an improved precipitation of the proteins of the sludge. The steam is preferably injected tangentially with respect to the outer wall of the agglomerator and the annular space is preferably provided with a helically-extending baffle, the steam inlet extending parallel to the surface of a baffle turn. This provides an excellent precipitation of proteins in a continuous process.

Abstract: A device for abstracting the liquid phase from a suspension comprises a microporous membrane (23) applied on the outside of a microporous body (22) to which a flat capillary duct (11, 18) is fixed. Means (9) are provided to rotate the duct about a vertical axis, with the membrane being immersed in the suspension in such a manner as to provide tangential filtering of the suspension and to cause the liquid phase filling the duct after passing through the membrane and the porous body to be ejected centrifugally and received by a receptacle (5) provided for the purpose.

Abstract: A mud slurry cleaning method including steps of distributing a mud slurry across an inclined primary separation screen, vibrating the primary screen through selected movement, cycle and frequency to screen out the liquid and selected particles, concurrently changing the geometric shape of the openings of the primary screen through each vibration cycle to free particles as might tend to lodge while concurrently impacting the primary screen at many spaced apart impact points to loosen particles tending to lodge, cyclonically separating the screened mud into a finally cleaned slurry and a thickened slurry including particles originally included in the original slurry, mixing the thickened slurry with a portion of the screened slurry to form a liquified slurry, distributing the liquified slurry across an inclined gleaning screen, and vibrating the gleaning screen as above described to screen out liquid and desired particles while concurrently changing the geometric shape of the openings of the screen and concurre

Abstract: A filter press for the thickening of cellulose pulp or sludge in which the filter press is furnished with a feedbox to lead the sludge suspension to the wire. In order to increase the capacity of filter presses or the like, the sludge to be dried can be fed through a feedbox in accordance with the invention, in which box there is at least one surface penetrating the liquid to facilitate thickening of the sludge suspension before it is lead to the filter press wire.

Abstract: A belt press for use in removing water from sewage sludge, and including a frame, a pair of belts for compressing sludge material therebetween, the said belts being water-permeable whereby water in said sludge may drain through said belts, and a gravity belt thickener adjacent the belt press. The gravity belt thickener includes a belt having a belt flight adapted to support sewage sludge thereon, the belt of the gravity belt thickener having a width greater than the width of the belt of the belt press.

Abstract: A waste disposal system for treating and disposing of infectious waste articles in a substantially controlled, closed, aseptic environment and for converting such infectious waste articles into a safely disposable, non-infectious non-toxic residue of solid waste independent from disinfecting liquid waste. A waste delivery conveyor transfers waste articles from an input region to preliminary waste processing apparata for preliminarily fragmenting the waste for further treatment by the system. Disinfectant spray is deposited on the waste as it enters the preliminary waste processing apparatus with the fragments resulting therefrom, together with the disinfectant liquid, being transferred to rotary hammermill elements to convert the fragment disinfectant solution to a solution of fine waste particles and disinfectant solution. Liquid solid particle separator apparata then separates the solid waste particles from the liquid disinfectant for independent evacuation of same.

Abstract: An apparatus for separating loose paper pieces from a bath of caustic soda including a tank with a hopper-like structure disposed at the top of the tank. A helical screw conveyor is operatively disposed below the hopper and has its discharge exteriorly of the tank. A pair of perforated stainless steel screen-type spaced rotatable drums is operatively disposed between the hopper and the conveyor, and a hollow stainless steel screen-type cylindrical filter (with a nylon filter cover) is positioned in the bottom of the tank and has an outlet extending to the tank exterior. In operation, a caustic soda solution mixed with paper pieces in the hopper is discharged by gravity onto the rotating drums which feed the paper pieces via the outer (rotating) drum surfaces into the conveyor and then to the exterior of the tank. The caustic soda solution flows through the perforations in the drums and then to the bottom of the tank and through the cylindrical filter for final filtering and then to the tank exterior.

Abstract: By providing an open-ended perforate vessel which is rotatable about its central axis and incorporates a removable filter element, a highly efficient easily employable precious metal recovery apparatus is achieved capable of removing precious metal from an aqueous carrier. Preferably, the perforate vessel is supportingly contained within a housing which receives the aqueous carrier after passage through the filter and delivers the aqueous carrier to a disposed area. In addition, the perforate vessel is preferably cylindrically shaped with holes formed throughout and the filter comprises a bag-like or envelope-like construction which is easily mounted about the walls of the vessel as well as easily sealed after filtration with the precious metal contained therein for delivery to a reclamation center.

Abstract: Thickening of paper pulp, or a like suspension, is effected prior to feeding the pulp to an apparatus utilizing stationary screens for effecting washing, bleaching, or further thickening of the pulp. The stationary screens are mounted in a top portion of a vertical-axis vessel, and a plurality of radially extending rotating hollow arms, with annular screens mounted on them, is provided in the bottom of the vessel to effect thickening of the suspension from, for example, 11/2% consistency to about 9-14% consistency. Extraction from the hollow arms is provided through conduits extending vertically through a hollow shaft for rotating the arms, and a filtrate valve is also mounted within the hollow shaft in operative communication with the filtrate conduits, and includes a valve member which is rotatable in a different direction, and at a different speed, than the hollow shaft.

Abstract: A filtration apparatus comprised of a rotary drum having a plurality of internal vanes for conveying slag material is presented. The slag is conveyed upwardly by the vanes, after which is falls freely onto a conveyer belt passing longitudinally through the drum. Deflectors guide the slag during its fall onto the belt. The deflectors are divergent and inclined relative to the direction of movement of the conveyer belt. The rotatable drum is axially subdivided into a plurality of sections, the vanes of each section being angularly offset in relation to the vanes of adjacent sections. The filtering apparatus herein effects uniform charging of slag material onto the conveyer belt.

Abstract: A conveyor belt assembly is presented for use in conjunction with a rotary drum filtration apparatus, the conveyor belt passing longitudinally through the drum. The conveyor belt assembly comprises two movable frame sections and an associated conveyor belt. A first movable frame section is slidably mounted, preferably by rollers on rails, on the supporting framework whereby the conveyor belt may be moved between an operative position inside the drum and a retracted position outside the drum. The second movable frame section is pivotably mounted and is capable of pivoting upwardly into a raised position thereby providing a space for the first frame section to be slidably positioned thereunder. Preferably, a ramp means attached to the slidable frame section urges the second pivotable frame section upwardly to the raised position.

Abstract: A filtration apparatus comprised of a rotary drum having a plurality of internal vanes for conveying slag material therein therein is presented. The slag is conveyed upwardly by the vanes, after which it falls freely onto a conveyer belt passing longitudinally through the drum. Each vane consists of a retaining blade and a liquid permeable filtering blade spaced from the retaining blade. A deflecting means is positioned beneath the filtering blade. The deflecting means includes a deflecting plate associated with a support member. The support member and the retaining blade provide a supporting frame work for the rotary drum.

Abstract: In a flotation basin a flotation zone and a pure liquid zone are formed which are separated by filter means. A liquid containing suspended matter is introduced into the flotation zone via an inlet and subjected to pressure release flotation by saturating pure liquid with pressurized gas under a pressure in the range of 3 to 8 bar and injecting the pressurized gas saturated liquid into the flotation zone in the region of the inlet. The flotated mud accumulating at the surface of the liquid is removed laterally by removal means coacting with the filter means or is removed by means of a combined filtering and removing device together with non-flotatable suspended matter on a filter web circulated or passed through the flotation basin. The mud is predried on the filter web and separated therefrom by redirecting its run, if desired, with assistance by a scraper. The mud falls into a collecting container separated from the flotation basin or its contents by a partition.

Abstract: The invention relates to means for filtering a liquid containing impurities. Said means comprise a filtering drum (9) rotating within a housing (1) and having around it an annular chamber (13) into which opens a conduit (6) for supplying the liquid to be filtered and a conduit (7) for evacuating the liquid leaving the drum and for cleaning the corresponding section. The lateral wall of the drum (9) is equipped with sliding blades (11) which prevent any and all communication between the two conduits (6) and (7). The filtered liquid is evacuated through the lower wall (9d) of the drum (9) through the lower wall (9d) of the drum (9) through an axial opening. The invention applies in particular to the filtration of fuel for aircraft engines.

Abstract: An extraction device for treating liquid-solid mixtures such as sewage sludge or paper pulp to remove liquid therefrom, includes a preliminary treatment station. The preliminary treatment station comprises at least two interchangeable perforated containers located on a displaceable receiver turntable beneath which a stationary disc is coaxially located. The stationary disc is provided with an aperture eccentrically disposed thereon, the aperture having a cross-sectional area corresponding to the cross-sectional area of the lower end of the container located on the turntable and to the cross-sectional area of an inlet aperture provided in the extraction device.By rotating the receiver turntable in a timed sequence a container is always moved beneath a filler tube, filled and further rotated. The solid components drop to the bottom of the container and liquid is discharged through the perforations provided in the container and the mixture thus has liquid removed in a preliminary treatment.

Abstract: A dynamic filtering system as described in which particulates are separated from a fluid as the fluid is moved by centrifugal force through filtering elements. A rotor mechanism received the fluid initially through a central inlet opening. The rotor is then forcibly rotated so the fluid is forced by centrifugal action out through a series of radially oriented passages. Filter elements are removably secured in the passages to intercept and trap particulates passing through the filter elements. Access to the filter elements is allowed without requiring disconnection of the inlet, discharge or rotor driving mechanisms.