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: An apparatus for recovering an oil-based liquid from a body of liquid including the oil-based liquid. The apparatus includes a pair of cooperating rollers defining a nip therebetween, an endless loop of oil-based liquid absorbent material that passes through the nip and extends from the cooperating rollers along a path into the oil-based liquid in the body to absorb the oil-based liquid from the body, and a diverter engaged with the material and spaced from the cooperating rollers along the path. The material is conveyed by the cooperating rollers along the path from the body and squeezed at the nip by the cooperating rollers to force the oil-based liquid to flow along the material. The diverter guides the oil-based liquid away from the material as the oil-based liquid flows along the material from the cooperating rollers. A scraper is engaged with the material ahead of the cooperating rollers along the path to remove debris from material prior to the material passing through the cooperating rollers.

Abstract: This invention relates to a belt press for dewatering sludge, such as sewage sludge. The press includes a camera to monitor physical operation of a gravity belt section of the press. A numerical control device uses electromagnetic radiation received from the gravity belt section to control the physical operation of the gravity belt section. An actuator device may be used to control a height of a weir for distribution of the sludge over the gravity belt section, and another actuator device may be used to control positions of ploughs which plough the sludge.

Abstract: A filter unit (10) designed to filter process streams having different components and/or different fluid flow rates. The filter unit includes an elongated filter housing (12) having an inlet port (14) at one end and an outlet port (19) at the other end. A filter element flange (32) is fitted in the housing. The filter element flange is provided with a number of bores (34) that are provided with threading. Filter elements (28) with threaded coupling heads (36) are removably secured to the filter element array by fastening the coupling head in the threaded bores. This arrangement allows the replacement of the filter elements without having to completely disassemble the filter unit. In the event the number of filter elements is less than the number of openings that are in the element flange, plugs (84) are secured into the links in which the filter elements are not seated to prevent unfiltered fluid flow from the inlet port to the outlet port.

Abstract: A belt-type filter apparatus for removing foreign particles from liquid baths includes a basin containing the liquid, a filter belt which is constructed as an endless perforated circulating support belt and/or a filter belt fleece which can be wound from a roller and may be placed on the circulating support belt, a low pressure chamber with intake openings arranged in the basin and connected to devices for producing negative pressure, and guide rollers which act on the support belt and/or filter belt fleece in such a way that the support belt and/or filter belt fleece are introduced from the top into the basin, are conducted over the intake openings of the low pressure chamber and are then conveyed toward the top out of the basin. The low pressure chamber is composed of a cylindrical drum which is mounted in the basin so as to be rotatable about a horizontal axis. The interior of the cylindrical drum forms the low pressure chamber and the cylindrical wall of the drum has the intake openings.

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 vacuum or gas pressure clamp prevents movement of an elongate filter cloth used in a horizontal vacuum filter. The clamp includes a support frame and a planar supporting device having a perforated support surface for supporting the filter cloth. The vacuum clamp is mounted on the frame and is adapted for connection to a vacuum source so that vacuum can be applied to numerous holes in the support surface. An imperforate sealing sheet extends over the support surface and in close proximity thereto. The filter cloth can be drawn between the supporting device and the sealing sheet. A vacuum can be applied to the filter cloth in order to prevent its movement in the longitudinal direction. Preferably the support surface forms a rectangular grid comprising rows of closely spaced holes. This grid is surrounded by a sealing surface. In the gas pressure clamp, an enclosure extends around the supporting device and the sealing sheet and a positive air pressure can be provided in this enclosure.

Abstract: Improved apparatus for dewatering or washing a suspension of paper pulp in which first and second rolls are rotatably mounted with an endless loop of wire tensioned around the rolls, and in which a headbox delivers a pulp suspension to be thickened or washed and positioned with an outlet to discharge the pulp suspension into or onto the wire as it approaches the first roll, and in which the washed or dewatered pulp is collected after it has passed between the wire and a second roll, in which the first roll has a central shaft, and screw flighting on the shaft formed in left and right-hand sections are terminated at cylindrical discs mounted at opposite ends of the shaft, and in which the screw flighting has a depth which is substantially greater than the maximum thickness of the pulp layer and in which the aggregate open area between the screw flights is substantially greater than the cross-sectional area of the headbox outlet to assure that the spaces between the flights can be no more than partially filled

Abstract: A machine for conditioning a flocculated mixture formed by adding high molecular weight polymer to a slurry of ultrafine particles such as are found in mining silts, clays, sludges and the like. With this machine, such mixtures, which have already been partially dewatered, can then be substantially further dewatered. Reductions to between about 27% and 30% moisture content have been obtained. The machine includes a perforate endless conveyor belt onto which a continuous flow of the mixture is deposited and an array of stationary inverter plates and rollers in which pairs of rows of plates alternate with the rollers, both the plates and the rollers extending downwardly into the mixture as it is being moved on the belt. The rollers in the array squeeze water out of the mixture without disrupting bonds between the polymers and ultrafine particles and, in the process of applying pressure, contribute to the formation of new bonds.

Abstract: A belt filter press having a wedge zone which can be adjusted during operation of the filter press to prepare a sludge or other material to be deliquified in the most efficient manner for high pressure deliquification also includes a sealing arrangement for sealing the marginal edges of the upper and lower belts, a tapered slide cam assembly on either side of the belts for adjusting the wedge angle in a controlled manner, rack and pinion assemblies associated with hydraulic cylinders on either side of the belts to ensure the uniform movement of the lower belt supports, and the staggered arrangement of upper and lower belt support members where the lower belt support members are concave-like in shape to facilitate the sealing of the marginal edges of the belts, as well as to form a confined pocket which will facilitate the shearing action induced in the material to be deliquified.

Abstract: The device for continuous filtration and drying of a solid suspension comprises a belt filter (1) and downstream a belt drier (2). By use of a porous conveyor belt (3) the filter cake generated in the belt filter (1) is conveyed further into the belt drier (2) in which there are provided heating devices for heating and drying the filter cake (7) which is on the conveyor belt (3). After leaving the belt filter (1), the filter cake (7) is present on the conveyor belt (3) in the form of a gas-permeable bed of solids in layer form having a maximum layer thickness of 50 mm, preferably a maximum of 20 mm. The heating devices in the belt drier (2) comprise, on the one hand, a hot gas chamber (8) disposed above the conveyor belt (3) to generate a hot gas which flows through the bed of solids downwardly from above and, on the other hand, one or more contact heating elements (10, 15, 18, 19, 20, 22) disposed above and/or below the conveyor belt (3).

Abstract: An anti rewet deck is provided for press rolls used to increase consistency of fibrous pulp slurry from approximately 4 percent up to about 30 to 50 percent. This is accomplished by biasing the location of the drainage holes in the roll shell to the forward edge of the drainage compartments within the roll shell. To avoid the necessity for handing of the rolls, a mechanism is provided for accomplishing the purposes of minimizing rewet at practical production rates by providing baffle plates which effectively orient the draining pattern in the desired direction. Such baffles can be permanently or removably installed once the desired handing of the rolls is determined.

Abstract: A belt filter press having a wedge zone which can be adjusted during operation of the filter press to prepare a sludge or other material to be deliquified in the most efficient manner for high pressure deliquification also includes a sealing arrangement for sealing the marginal edges of the upper and lower belts, a tapered slide cam assembly on either side of the belts for adjusting the wedge angle in a controlled manner, rack and pinion assemblies associated with hydraulic cylinders on either side of the belts to ensure the uniform movement of the lower belt supports, and the staggered arrangement of upper and lower belt support members where the lower belt support members are concave-like in shape to facilitate the sealing of the marginal edges of the belts, as well as to form a confined pocket which will facilitate the shearing action induced in the material to be deliquified.

Abstract: A filter designed in compact form and requiring low filtration cost, by which there is no need to replace filter each time it becomes clogged and for which no liquid for backwashing is required, and with which is possible to filter under liquid pressure. In the filter, two ends of a filtering segment with a predetermined length of a filter medium in an oblong tube shape are movably and closely squeezed and held by a pair of opposing pressure rollers. A raw liquid introducing pipe is closely squeezed and held between a pair of pressure rollers, a forward end of the raw liquid introducing pipe is disposed within the range of the filtering segment of the tube-like filter medium. The filter medium is moved to the filtering segment constantly or when the filter medium is clogged, and the clogged filter medium is moved beyond the range of the filtering segment.

Abstract: A belt dryer for dewatering fine particle suspensions includes a continuous conveyor belt with a slotted vacuum pipe disposed beneath a dewatering station, a support below the conveyor belt adjacent the dewatering station immediately downstream of the slotted pipe, and a press roll above the conveyor belt and adapted to exert pressure on the support bar to create an even film of suspension over the slot which facilitates extraction of filtrate.

Abstract: In order to wash the lower run of a horizontal belt filter more effectively, and simultaneously provide for tensioning of the lower run, as required when progressing the belt intermittently, a dead weight roller is supported in a bight of the lower run of the filter belt and reciprocates up and down in a wash liquor vessel as a drive roller is alternately extended, so as to advance the upper run of the belt, and retracted. A one way device is located upstream of the dead weight roller to prevent backward movement of lower run. As the bight decreases and increases, rolling action of the dead weight roller rubs the belt and forces wash liquor therethrough. A plurality of dead weight rollers in one or more wash liquor vessels may be provided and they may be guided at their ends in vertical or oblique guide tracks.

Abstract: A filtration apparatus specifically intended for removing particulate contaminants from commercial laundry waste water has at least one porous mesh-like filter bag coupled between an inlet manifold for receiving waste water containing particulate contaminants and an outlet manifold for discharging the particulate contaminants separated from the waste water. The filter bag is agitated by a paddle, so as to prevent the mesh-like material of the filter bag from being clogged. Also disclosed is a method for filtering waste water containing particulate contaminants.

Abstract: Apparatus for continuously separating a solid fraction from a liquid fraction in a mixture of such fractions has a stationary cylindrical vessel which is filled with the mixture and confines a rotary carrier as well as a battery of parallel disc-shaped filters mounted on and rotating with the carrier. The filters define internal chambers for separated liquid fraction and have foraminous walls which flank the respective chambers and intercept the solid fraction. The intercepted solid fraction is removed by stationary devices having receptacles immersed in the mixture, defining internal compartments for solid fraction and carrying sealing elements which prevent penetration of mixture from the internal space of the vessel into the compartments. The separated liquid fraction is evacuated fom the vessel through a channel in the carrier, and the solid fraction is evacuated from the internal compartments by suction and/or mechanically.

Abstract: An apparatus for producing juice from a layer of fruit mash including circulating screening belts of a screening belt press, which are guided around drums or rollers of at least one pressing zone jointly forming a meander-like pressing path. The screening belts are guided in a high-pressure pressing zone between at least one pair of stationary pressing rollers and around a pressure roller which is radially movable relative to the pressing rollers. In the pressing position the pressure roller forms a line pressure gap with each of the flanking pressing rollers which acts on the cross-section of the layer of fruit mash.

Abstract: A system (method and apparatus) for optimizing the relationship between resolution and time in chromatograms, especially chromatograms obtained by supercritical fluids (CSF) chromatography. The pressure or temperature or fluid density of the solution caring the material under analysis is varied dynamically under computer control to provide an optimum capacity factor for a particular transporting fluid in a particular chromatographic system to obtain the resolution of interest in the shortest period of time.

Abstract: A method and apparatus for separating contaminating substances from a liquid containing contaminating substances in which the liquid is passed through a filter of resilient, porous filter material. The contaminating substances are separated from the liquid in the filter whereafter the filter is displaced to a position out of the liquid flow. In this displaced position, the filter material is compressed to squeeze out liquid retained in the filter together with separated substances retained in the filter by opposed frustoconical rollers. After the compression has ceased, the filter is moved to a position where the liquid once again passes through the filter material for renewed separation and accumulation of contaminating substances in the liquid.

Abstract: A water management system removes water vapor from the analyte slug that is desorbed from the trap. The water management system includes a device having a passage through which the volatile organic chemicals and water pass, the passage being designed to remove water vapor by swirling action on the stream. The amount of water removed is more than can be accounted for by simple condensation. The invention also includes the adjustment of the temperature of the water management device during the sample concentration cycle to prevent undesired condensation prior to desorption.

Abstract: A device for extracting liquid from sludge which uses a perforate conveyor belt to carry the sludge through the device. A portion of the belt carrying the sludge is supported by a grid support system which includes a series of wear support members. These wear support members each have a rigid body member having an insert wear strip slidably mounted on the rigid body member which can easily be removed from the device without disconnecting the body member from the device.

Abstract: A method of rinsing a slurry contained between a pair of converging mesh belts comprising the steps of splitting the slurry into two streams, each stream adjacent one of the converging mesh belts, introducing a stream of rinsing fluid between the two slurry streams, the point of introduction of the rinsing fluid between the two slurry streams is not more than 12 inches before and not more than 72 inches after the slurry streams contact the converging mesh, and creating compressive forces within the pair of mesh belts, which compressive forces continue for a distance of at least 24 inches after introduction of the stream of rinsing fluid.

Abstract: The invention relates to an apparatus, in particular a machine, for the pressing and dewatering or filtering of sludges, fibrous material suspensions or cellulosic material suspensions, having two circulating filter belts or screen belts between which the material to be pressed, dewatered or filtered is made to pass, and two circulating pressure belts or supporting belts for supporting said two filter belts on their sides facing away from the material to be treated, with supporting or pressure means, in particular stationary during the operation of the apparatus, for the pressure or supporting belts on their sides facing away from the filter belts or the material to be treated.

Abstract: An apparatus for simulating the operation of a full-scale belt filter press consists of a support base, a filter belt and a press belt each anchored at one end to the support base and passing over a static curved pressure face and a winch for exerting a pulling force on the press belt against the static curved press face to remove water from a sample of slurry on or within the belts. An improvement in the method of removing liquid from a slurry with a belt filter press also is disclosed which consists of pulling the pair of belts containing a slurry against a static curved pressure face to force liquid out of the slurry.

Abstract: A beltpress controller performs on-line measurements of output sludge cake thickness. A controller takes a product of the measured cake thickness with belt speed, moisture content and belt width to determine a rate of dry solid output per unit time. The calculated rate is compared with a desired rate and the sludge flow rate is adjusted by adjusting the speed of a sludge feed pump to obtain the desired dry solid output rate. In systems which mix polymer with the sludge to increase the dewatering efficiency, the sizing of a mixing orifice through which the sludge and polymer is provided is adjusted to maintain a substantially constant mixing energy. This prevents errors in the streaming current detector which measures the amount of excess polymer in the filtrate and the controller adjusts the speed of a polymer dosing pump accordingly.

Abstract: A method for removing liquid from a mixture of liquid and solid matter wherein the mixture is led over one or more casings by a conveyor belt which is pervious to liquid. In use a sub-atmospheric pressure is generated in the casings during a first period, in which the casing(s) and the conveyor belt are stationary with respect to each other, while at the same time a pressure is exerted on the mixture by one or more rollers. During a period following the first period, a relative movement takes place between the conveyor belt and the casing(s), while during this period no sub-atmospheric pressure is exerted in the casings and no compressive force is exerted on the mixture by the rollers.

Abstract: A self-cleaning vacuum filter, particularly for filtering industrial lubricants and coolants, comprises a tank for the liquid to be filtered containing a filter assembly, the bottom of which communicates with a vacuum chamber connected to a suction device for the liquid. The filter assembly includes a screen and an endless loop of regenerable filter cloth movable in steps over the screen and through a station for the removal of the filtered material, the station extending out of the tank and having a removal device for removing the filtered material from the filter cloth. The removal device includes a roller extending transverse of the filter cloth, substantially in contact therewith, and a motor for rotating the roller at high speed.

Abstract: A method of and apparatus for dewatering a substance which is to be dewatered such as sludge wherein the substance to be dewatered is pressed between a pair of rollers (11, 212) or plate-shaped press members (331) each having its press surface formed from a rigid porous material (6, C, 331) having water absorption and retention properties based on the capillary action; water squeezed from the substance by pressing is permeated into the rigid porous material due to water absorption based on the capillary action or water pressure and the permeated water is retained by virtue of the water retention properties based on the capillary action, thereby dewatering the substance; and the water retained by the rigid porous material is discharged by sending pressurized air to regenerate the capillary tubes.

Abstract: In the method and apparatus for filtering industrial processing liquids including feeding unfiltered liquids into a tank, guidably movably supporting and immersing portions of a continuous conveyor screen within the tank, positioning a filter media upon and along the screen with the filter media providing a loop within the tank, a clean liquid reservoir within the loop and an unfiltered liquid reservoir upon its exterior, providing an open top vacuum chamber within the clean liquid reservoir with the conveyor screen sealed over, along and covering the vacuum chamber, and positioning a power-operated tractor chain sludge elevator upon the tank opposite the open top of the vacuum chamber to longitudinally overlie and frictionally engage the outer surface of a return portion of the filter media effecting a positive upward lift movement of adjacent portions of the filter media with accumulated sludge thereon.

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: The invention relates to a device (1) for crushing plant matter, particularly for re-pressing sugar-beet chips. The matter to be pressed is distributed in thin layers of approximately 10 mm thickness on filter cloths (2) and is then subjected in a plurality of superposed plies (3, 4, 5, 6) to a high compressive pressure between a press platen (7) and a press crown (8). A loading device (10) is provided to deposit the matter to be pressed in layers on the filter cloth (2). The press platen (7) and the press crown (8) are essentially level, rectilinear and horizontal. The stack (25, 25') formed by the filter cloth (2) and the matter to be pressed is also fed rectilinearly and horizontally through the press opening (9, 9A) between the press planten (7) and the press crown (8).

Abstract: The present invention relates to a procedure and a device for dewatering slurry and similar substances, in which the slurry is fed into a completely enclosed slurry chamber (2) by a pump (7), and a hydrostatic pressure of adjustable magnitude is produced. The slurry chamber (2) is subsequently isolated from the pump (7), the volume of the slurry chamber (2) is reduced and a mechanical dewatering pressure is generated.

Abstract: Apparatus for extracting liquid from a slurry containing fine solids and liquid comprising an endless screen formed of woven monofilaments of thermoplastic material so as to define a multiplicity of small openings extending between opposite sides thereof and a supporting structure for supporting the endless screen for movement through initial and intermediate operative run portions along an underside thereof in such a way as to present an upper operative side thereof for the accumulation of solids thereon by the passage of liquid through the openings thereof. The screen supporting structure comprises a multiplicity of fixed closely spaced parallel bars formed of material having favorable wear and coefficient of friction characteristics with respect to the thermoplastic material of the endless screen.

Abstract: A belt filter press comprising two co-operating, endless belts, particularly for manure, which according to the invention takes steps to enable liquid and solid substance to be better separated from each other. The pressure between the endless belts is increased, the longitudinal edges are sufficiently sealed and substance that is still too moist is subjected repeatedly to compression since it remains stuck to the upper endless belt and is carried to the intake of the belts.

Abstract: Apparatus for removing oil from the surface of a liquid using an endless belt partially submerged in the liquid, the belt passes over a primary roller having a vertical axis and pressure rollers squeeze the belt on the primary roller removing oil from the belt which flows by gravity to a collection receptacle mounted upon a frame supporting the primary roller and its drive structure. The belt twists whereby its lower portion submerged in the liquid defines a reversing loop whose configuration is maintained by a weight roller having a horizontal axis of rotation.

Abstract: Apparatus is provided for dewatering an aqueous clay suspension by a process which includes preparing a partly dewatered filter cake and concurrently compressing the partly dewatered filter cake on a filtration drum while applying vacuum suction to it from inside the drum, and then removing the dewatered cake from the filter. The process also purifies the filter cake. An apparatus suitable for carrying out the process comprises a rotary vacuum filter, means for compressing the clay filter cake on the filter medium and means for applying vacuum filtration to the same portion of the cake being compressed. The compression means may comprise a rotatable roll mounted for rolling compressive contact with the filter cake. The rotatable roll may have a non-stick bearing surface to which solids of the filter cake are substantially non-adherent. The rotatable roll may be a pneumatic roll designed to conform to the filter drum and increase the size of the contact zone between the filter drum and the compression roll.

Abstract: Procedure for draining of sludge, especially flocculent flotation sludge, including introducing water-sludge mixture into a settling tank with an overflow and removing the settled sludge layer from the settling tank with a slanted conveyor. Horizontal grooves are then pressed in the sludge layer by section roller rows arranged over the slanted conveyor belt. The water extracted from the sludge layer is collected and canalized in these horizontal grooves. The back-flowing water is then collected and guided off in water drainage systems arranged over the slanted conveyor. These water drainage systems are tilted toward and enter a front side of the horizontal grooves. This collected water may either be eliminated directly or returned to the settling tank.

Abstract: Disclosed herein are a method and apparatus for removing liquid from a permeable material, such as slurries, sludges, porous solids and permeable foams. The method and apparatus involve constraining the material to be deliquified such that the material interfaces with at least one surface which is permeable to the liquid to be removed and then heating the material at one or more locations remote from the permeable surface or surfaces. Such constraining and heating of the material causes the in situ vaporization of the liquid in the vicinity of the remote location or locations. The vaporized liquid expands and forces at least some of the remaining unvaporized liquid through the permeable surface or surfaces.

Abstract: It is desirable to be able to treat medium consistency (e.g. about 8-12% by weight) paper pulp suspensions with treatment liquid (e.g. a wash liquid), and to thicken the pulp to about 30-50% consistency at the same time. A moving (e.g. rotating) channel is defined by a root wall and upstanding side walls--some or all of which are perforated--and treatment liquid is introduced by an arcuately elongated distributor with perforated side walls into the center of the pulp within the channel, filtrate flowing out through the perforated walls. A pivoted wall portion of the stationary housing of the treatment device restricts outflow of the thickened pulp cake from the device, the cake flowing between a doctor blade and the pivoted wall portion.

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: A sludge processor is provided which enables rapid disassembly and reassembly for changing between a sludge thickener configuration and a press configuration, and for enabling rapid disassembly for cleaning in the press configuration. The processor includes a frame with opposite sides and roller-holding bearing devices at the opposite sides for holding rollers about which a belt extends past a sludge dewatering region. The bearing devices can be arranged in a first configuration (FIG. 2) wherein the belt (12A) extends in an even path, and a second configuration (FIG. 1) wherein the belt extends in a tightly convoluted path so it and material thereon is squeezed between adjacent rollers. The bearing devices (50, FIG. 4) are releasably mounted to the frame sides to enable rapid conversion, and to enable rapid removal of the rollers for cleaning the processor when used in the second configuration.

Abstract: The apparatus comprises, among other things, an external group or unit (10) and an internal group or unit (20) which are movable relatively and which define a chamber (17) and an enclosure (223) separated by a body (11) permeable with respect to the liquid and impermeable with respect to the solid matter and an impervious elastic membrane (220) which can be expanded so as to be able to reduce the volume of the enclosure (223) in order to expel from it the liquid of the substance to be treated which has been placed therein and in order to press the solid matter against the body (11) or a filter (16) from where the said solid matter is detached by a scraper (50) so as to be collected separately.Application for the production of separated solid matter with a dry-matter content at leaet equal to 40%.

Abstract: A mechanical sludge dewatering system including a plurality of first rollers, one or more second rollers and a liquid-permeable, endless belt passing between the first and second rollers from an inlet to an outlet end. At least some of the rollers of the first set are tapered from their ends to a smaller diameter at the center, the amount of taper decreasing from the roller at the inlet end to that at the outlet end, the opposing one or more second rollers being of constant diameter. The sludge carried on the belt passes through the cavities defined by the tapered first rollers and the cylindrical second roller(s), which decrease in cross section from the inlet to the outlet end, thereby squeezing water from the sludge. The first rollers each have grooves around their periphery adjacent each end, and the belt carries a protruding strip along each side, the belt being laterally constrained by the strips riding in the grooves.

Abstract: A twin belt filter press system has an amendment such as sawdust, fed to a sludge or slurry being dewatered after the sludge/slurry has been initially dewatered in a gravity drain section to form a cake on a first porous belt. The amendment cascades into the partially dewatered cake off the first belt, allowing mixing of the cake and amendment in an essentially belt-wide drop zone so that the amendment partially and quickly desorbs the cake before the cake and amendment mixture progresses into a nip formed by the first belt and a porous second belt. The mixture subsequently is carried in a position between the belts for pressing to remove moisture from both the cake and amendment. In one embodiment a shear-minimizing mixer is arranged in the amendment drop zone to additionally mix the amendment with the cake.

Abstract: A press-filter including a chassis, two endless filtering webs, guide rollers defining paths for the two webs, the paths of which are partially contiguous, and several squeezing rollers located on either side of the filtering webs along their contiguous path portions and squeezing the webs, one of which consists of a drum. The press-filter further includes a curved rigid roller race at least partially encircling the drum and spaced therefrom by a predetermined gap. A plurality of squeezing rollers are rollably mounted on the roller race wherein the filtering webs encircle the drum over a major portion of its periphery and pass between the drum and the squeezing rollers.

Abstract: A continuous discharge centrifuge can separate a slurry into a solid and liquid portion. The centrifuge has a housing and a rotor mounted in the housing to spin at a predetermined rate. The centrifuge has a spaced plurality of filters peripherally mounted on the rotor for separating the liquid portion by admitting it under centrifugal force. Also included is a spaced plurality of passage columns mounted between adjacent pairs of the filters. The columns can engage the outside of filters and conduct the solid portion upon the filters between it and the passage columns.

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: A pressure device for machines for dewatering or filtering of suspensions, sludges or the like or for material to be pressed for the exertion of surface pressure on at least one circulating pressure belt which can be provided for supporting an equally circulating filter belt, which pressure device consists of an essentially completely hollow pressure bladder in the form of a closed frame in particular of essentially quadrangular shape viewed in top view of the pressure belt, which pressure bladder is subjectable to pressure medium and forms a very small, self-adjusting gap on the edge.