Abstract: A process for recovering protein, fatty and water components from a float material produced by a waste water treatment system, wherein the protein and fatty components can be further processed for inclusion in various products, such as animal feed. The recovered water component can also be further processed before discharge into a sewer system.

Abstract: A dewatering apparatus of filter belt type has a guide member having a guide surface whose radius of curvature becomes smaller in the direction of belt travel. An endless roller chain travels along the guide member. A restricting sprocket has a pair of engaging tooth surfaces for engaging with rollers of said roller chain and is rotatably supported near one end portion of the guide member. Endless filter belts hold sludge between an upper filter belt and a lower filter belt. The filter belts are arranged to partly overlap on the rollers from a side of the guide surface of a larger radius of curvature and to depart from the rollers at a side of the guide surface of a smaller radius of curvature, whereby the upper filter belt and the lower filter belt are separated from each other to discharge the sludge. Driving rollers give a traction to the filter belts at a side at which the filter belts are separated from the roller chain.

Abstract: A slurry is subjected to a filtration and washing process in order to separate the liquor from the solids. The filtration and washing process is carried out in a housing (101) enclosing an inert gaseous atmosphere which also passes through the filter cake and may be recycled, after treatment, to remove contaminants therefrom. To prevent recontamination of the filter cake as a result of the recycled gas entraining contaminant vapors within the housing (101), the gas is introduced into the housing (101) at a downstream location (152a, 166) relative to the direction of travel of the filter cake on a movable filter medium (100) and in such a way as to develop a contaminant concentration gradient whereby the cleanest cake is contacted by gas having the lowest contaminant level.

Abstract: A plurality of sensors sense a plurality of parameters including flow rate of a slurry being filtered sensed along a filtration medium and differential pressure across the medium which characterize the operation of a cross-flow filtration system having a moving, continuous filter medium. The plurality of sensors produce a plurality of signals representative of the plurality of parameters. A processor processes the plurality of signals to provide at least one control signal. The at least one control signal is applied to the filtration system to control at least one parameter thereof. As a result, a desired operating condition or a desired performance criterion is automatically maintained during operation of the filtration system.

Abstract: A filter apparatus for removing solids from a liquid in which chain conveyor loops frictionally engage a segment of a continuous permanent filter media belt extending across the bottom of a tank over a perforate section through which liquid is withdrawn to be filtered. The chain conveyor loops and permanent filter media follow divergent paths after exiting the tank, the chain loops returning over the top of the tank, the permanent filter media belt returning beneath the tank to a point of entrance at the top of a rear tank wall. A disposable media belt is optionally introduced at the point the permanent media belt and chain conveyor loops reconverge at the entrance point of the tank at the rear wall. The chain conveyor loops are indexed periodically and frictionally engage the permanent media belt (and disposable media, if used) in the segment extending across the tank bottom to cause the belt media to likewise be indexed.

Abstract: A method for removing debris from a free flowing water system (100) using an improved filter apparatus (10) is described. The apparatus includes a rail (12) which is mounted adjacent the water supply intake opening (102) and a continuous belt (36) made of chain links (38) and connectors (44) which mounts around an upper sprocket cylinder (26) and a lower sprocket cylinder (32) spaced between the ends of the rail. Openings (42) in the belt collect debris from the water flowing through the belt. The connectors have lifters (50) which move the debris collected on the front side (36A) of the belt and tilt to dump any debris of excess weight back into the water system. As the belt moves upward, the debris collected on the belt and by the lifters is moved out of the water system toward the top of the rail. As the belt moves over the upper sprocket cylinder, the upper sprocket teeth (28A) extend through the openings of the belt loosening the debris trapped on the front side of the belt.

Abstract: Process for the treatment of the combustion residues and for the purification of the combustion fumes, in which the residues are washed and then rinsed to reduce the leachable fraction both in respect of the trace elements and in respect of the total soluble fraction, with a low consumption of water and of optional reactants.

Abstract: A filter apparatus and method use a permanent filter media belt to support a disposable filter media strip which are indexed over a vacuum chamber perforate cover plate at the bottom of a tank containing liquid to be filtered. A flight conveyor frictionally engages the disposable media strip to index both the disposable media strip and the permanent media belt. The side edges are each extended out into a seal enclosure containing an inflatable tube seal, each pressurized to seal the side edges during filtration, the tubes depressurized when the media are indexed.

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: A method is disclosed for remediating ponds and other water sites containing sludge and other waste materials by a dredging and dewatering process which is economical and efficient, uses relatively low cost equipment and provides for high remediation rates. The preferred process dredges the site to produce a sludge which is screened to remove oversize material. The screened sludge is then thickened and the thickened sludge dredged and fed as a uniform thickened sludge mixture to a filter press to dewater the sludge producing a final sludge product having a high solids content. A coagulant is preferably added to the sludge and a polymer and/or coagulant added to the thickened sludge filter press feed.

Abstract: The present invention provides an apparatus for separating into solid material and liquid a mixture thereof. The apparatus includes a movable filtering element for filtering the mixture, a feed device for supplying the mixture onto the filtering element, a suction device for drawing off liquid from the mixture through the filtering element and a measuring device for measuring the area or areas on the filtering element where the liquid is predominantly to be found.

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 self-cleaning filter apparatus for use in removing particulate matter from a transport fluid, such as air, which includes a housing having a pair of spaced pulleys over which an endless filter belt is positioned to present two generally straight filter reaches and two generally curved filter reaches. The endless filter belt includes a permeable substrate formed as an endless belt and a plurality of pleats of filter media extending outwardly from the surface of the substrate so that the transport fluid can pass inwardly therethrough an deposit the particulate material on the exterior surface of the pleats. A suction nozzle is positioned adjacent the outer surface of the endless filter at one of the curved reaches thereof for removing particulate matter deposited on the pleats as they pass along such curved reach.

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 apparatus transforms animal waste produced during husbandry activities into useful materials such as organic-based manure and/or fertilizer to thereby mitigate the pollution problems associated with husbandry activities. A base part of the apparatus includes an endless conveyor having a filter in the form of an endless loop. A liquid-collection receptacle is interposed between the upper and lower runs of the filter so as to collect liquid filtrate from the waste material. A first hopper is located beneath one end of the endless loop so as to collect the solid content of the waste conveyed along the upper run of the filter. A second hopper is provided to accommodate material to be added to the solid content of the waste. The materials are fed from the respective hoppers into a mixing chamber whereupon they are mixed by a mixer. The base part of the apparatus is connected to a closed system of treatment tanks.

Abstract: The solid content and liquid content in a solid-liquid substance can be separated continuously at a high solid-liquid separation ratio by: causing a looped filter cloth member to travel, the filter cloth member being wound at least once around a wringing roller, and having a twisted portion at which the filter cloth member is twisted at least once and wound around the wringing roller; inducing a primary rotary motion of the wringing roller in a direction in which the filter cloth member travels; inducing secondary rotary motion of the wringing roller in a direction in which the filter cloth member is twisted upstream with respect to the wringing roller; and supplying a solid-liquid substance to an upstream portion of the filter cloth member with respect to the wringing roller.

Abstract: A method and apparatus for dewatering a wet web wherein the water is withdrawn from the web via capillary action of the pores of a thin porous membrane component of a bi-component filtration medium and transferred to a plurality of reservoirs defined in a second component of the medium from whence the water is withdrawn and directed to a collector or disposal site.

Abstract: A system and method for returning coolant from a number of machines to filter units, in which contaminated coolant collected in machines sumps is drawn upwardly through draw tubes and into an overhead downwardly inclined collector header by applying a vacuum in the collector header. The draw tubes extend above the collector header and are inclined downwardly and enter the collector header to aid the flow of coolant down the collector header. The contaminated coolant is drawn through the filter units, and the filtered coolant is drawn into venturi ejectors which generate the system vacuum, emptying into a clean tank from which is supplied filtered coolant back to the machine units.

Abstract: An oil skimmer of the endless belt type is disclosed. The unit has an adjustment for adjusting the location of the axis of head pulley rotation and a floating tail pulley to assure accurate tracking of the belts on the pulleys. The tail pulley features L-shaped spokes having legs that provide limited pulley-to-belt contact, minimizing oil transfer from the belt to the tail pulley, and also providing a mechanism for forcing oil against a descending belt reach to provide enhanced oil pick-up. The tail pulley is provided with a catch frame and an anchored tether for catching the belt and the tail pulley in the event that the belt breaks.

Abstract: A process for dewatering sludge on a flight of a foraminous filter belt that moves in a substantially longitudinal direction between sludge deposit and sludge discharge positions is disclosed herein.

Abstract: A method and apparatus for the removal of water, liquids and liquors from sludges and slurries, the sludges and slurries mixed with an electrolyte to improve conductivity and introduced into a conveyor chamber where an electrical path is established to permit electrical energy to pass through the conveyor chamber and the sludge, slurry and electrolyte to free bound water and remove it from the sludge or slurry, and to heat the sludge or slurry to drive off remaining water by vaporization.

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: An apparatus for dewatering aqueous sludge is disclosed. A porous drum is partially immersed in a sludge pond. A porous belt is connected between the drum and a roller which moves the belt. As the belt moves, the sludge adheres to the belt. A vacuum is drawn on the interior of the drum, removing some of the water. Sludge which is conveyed on the belt is frozen as it approaches the roller. The frozen sludge is broken into smaller cakes as it leaves the roller. The frozen cakes are subsequently dethawed providing a solid residue which is disposed.

Abstract: Method of feeding separate streams of (1) an aqueous dispersion of pulp and (2) white water from a paper making process into a wedge-shaped space between horizontal travelling upper and lower converging wire meshes, applying a siphon means to the upper wire mesh in said zone to form a web of solid fibrous material between the meshes separating the upper wire mesh from the web to leave it supported on the lower wire mesh as the meshes leave the wedge-spaced zone; washing all solids from the wire meshes into a receiving vessel, recycling the contents of the receiving vessel to the paper making process, and recycling the liquid from the white water to the paper making process; and apparatus to perform the above method.

Abstract: A method for thickening a liquid suspension of solid particles, such as papermaking pulp in water, uses a pair of spaced apart rolls and a woven wire or plastic wire belt trained around these rolls. The suspension is supplied at the first roll for centrifugal extraction and is carried by the belt to the second roll for further water extraction and thickening, and is then discharged from the apparatus. In one embodiment, the first roll is formed with an open surface, and the suspension is delivered to the web at least partially by flowing both into and out a roll chamber via the first roll openings, from a headbox in the on-running wedge zone.

Abstract: Apparatus for concentrating and deodorizing ruminant waste effluent. The effluent is passed thru a hydrocyclone. The conentrated, deodorized solids waste is suitable for disposal or can be further processed to turn it into fertilizer. The cleaned water can be discarded or reused.

Abstract: A method for efficiently thickening and dewatering a slurry sludge in a short period of time without the necessity of a vast site, which comprises the steps of: stirring a slurry sludge added with a coagulant in a stirring tank to convert the slurry sludge into a floc; supplying the floc and a superantant liquid, which are produced in the stirring tank, onto an inlet side of an inclined endless travelling filter cloth of an endless travelling filter cloth type dewatering unit, which comprises a dewatering tank and the above-mentioned inclined endless travelling filter cloth arranged in the dewatering tank; continuously travelling the thus supplied floc, on the endless travelling filter cloth, toward an exit side thereof; thickening the floc on a portion of the endless travelling filter cloth, which portion is located in the supernatant liquid in the dewatering tank, and dewatering the thus thickened floc on a portion of the endless travelling filter cloth, which portion is located above the surface of the sup

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: In the inventive method and apparatus for the continuous discharge of water and fine particles from a suspension, particularly fibrous pulp, the pulp or suspension is thickened without forcing the removal of water through a relatively thick, uncontrollably gathered fiber mat. In the method, the suspension to be thickened is fed into a filtering chamber, the suspension is continuously mixed for equalizing consistency differences, the liquid is continuously removed from the suspension through a filter and the thickness of a fiber mat which forms on the filter surface is controlled by subjecting the mat to shear stresses. In a thickening apparatus for practicing this method, at least one of co-operating surfaces--i.e. the filtering surface (8) and its counter-surface (10)--is provided with loosening members (12) for non-mechanically limiting the thickness of a fiber mat forming on the filtering surface and thereby preventing the uncontrolled formation of such a mat on the filtering surface (8).

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: In order to remove underground contamination, it has already been disclosed either to replace the soil, to wash the soil, to draw off the soil air or to carry out ground water desorption. All these processes are very complex and cost intensive. In particular, they do not provide a final solution to the problem, but instead merely move the problem, since the substances removed from the water to be purified are retained and must accordingly be stored safely, for example in waste dumps. The invention is an improved process and plant of this type which is simple and inexpensive to carry out and fully degrades the substances removed from the (ground) water. The object of the invention is achieved by, on the one hand, flushing through the soil, in particular its contaminated zone (17), and, in addition, biologically purifying the (ground) water. The process and the plant are particularly suitable for removing underground water contamination by hydrocarbons on old industrial sites.

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 first electrode arrangement and a transport element are movable relative to a support. A working space is disposed between the movable elements for advancing moist material along a processing path. As the moist material advances, electrical current is passed through the material between the first electrode arrangement and a second electrode arrangement adjacent the transport element. An acoustic transducer arrangement disposed adjacent the working space simultaneously subjects the moist material to an acoustic field as the material moves along the processing path. The acoustic field is generated by an array of acoustic transducers spaced along part of the processing path.

Abstract: A system for filtering solid-containing plating waste comprises a reusable filter media belt that travels in a continuous loop between a filter tray, where filtration takes place, and a multi-compartmented cleaning tank where the belt is cleaned for reuse. Each compartment in the tank is substantially closed at its lower end, and open at its upper end. The belt travels in and out of each of the tank compartments in sequence, being subjected to a liquid cleaning treatment in each by contacting sprays and/or bath immersion before being returned to the filter tray for reuse. A wringer is provided at the top of each compartment through which the belt passes before proceeding to the next compartment in order to isolate the treatment liquids from each other.

Abstract: An apparatus for separating of flowable and non-flowable constituents mixed with each other, particularly for the purpose of preparation of foodstuffs, operates with an elastic presser belt which is held pressed against the circumferential surface of a separating drum and which is guided between laterally bounding walls. For reducing the unavoidable leakage flow in the region of the radial sealing gap located between the perforated drum and the presser belt, the sealing gap is provided with a radial recess, which extends over the region of the separating drum encompassed by the presser belt and has an opening in the region of the entry wedge which connect said recess with this region.

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 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: The present invention relates to a process and a device for selectively separating the solvents employed in the preparation and purification of products. In this connection the different solvents are removed from the product to be treated by means of mechanical separation and subsequent admission of steam, and are collected separately. As a result of this, mixing of solvents from the preparation and from the purification is avoided, so that the working up of a solvent mixture is superfluous. The proces and the device are preferably used in the process for producing starch ethers and cellulose ethers.

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: An improved method for dewatering thin slurries of very fine clay or clay-like material to yield high solids content filter cake, for example, 40% solids and greater, by the use of flocculating agent combinations involving polyethylene oxide-type flocculating agents and polyacarylamide-type flocculating agents. The method generally involves admixing the combination of flocculating agents with the slurry, dewatering the slurry by means of a mechanical dewatering apparatus and feeding the thickened slurry to a belt press filter.

Abstract: Filter apparatus and method for separating contaminants from a liquid stream through at least a partially submerged liquid pervious rotatable drum under negative pressure and having a flexible filtering web fed therearound with that portion of the drum not contacted by the filtering web being covered by a cover means with the filtering web being guided to enter and exit the liquid stream to contact the pervious rotatable drum at preselected angles to make optimum contact with the rotatable drum.

Abstract: The flow of waste water sludge flocculant to a dewatering system is regulated by a surface proximity sensor located downstream of the flocculant addition point. Depth, variability and continuity of a partially drained sludge mat are evaluated by a depth sensor signal processor/analyzer. Signal characteristics representative of an optimally flocculated sludge mat are referenced by the processor/analyzer to establish high and low control set-point values. A variable speed flocculant supply pump or flow control valve is adjusted in response to an operational signal from the depth sensor which exceeds the set-point range.

Abstract: An apparatus and method of electro-dewatering sewage sludge and other high water sludges. The sludge is passed through a conveyor means that is electrically charged. The anode has metal bristles or wires that protrude into the sludge mass. Water that migrates to the cathode is removed by conventional means. The dried sludge, which is attached to the bristles, is removed by vacuum means. About 30 percent of the sludge mass can be dewatered per pass.

Abstract: A method of dewatering filter cake in which the cake is supported on a positively driven pervious conveyor belt or filter cloth. The cake is guided about the circumference of a drum, with the drum positively driven at a variable speed of rotation. In the region of the drum, the pervious conveyor belt or filter cloth holds the cake against the periphery of the drum and additional pressing rollers press the filter cloth and cake against the drum. The drum drives the filter cloth in this region through the medium of the filter cake and induces shear effects in the cake. The speed of rotation of the drum is regulated in dependence on the tension existing in the filter cloth.

Abstract: A filter press utilizes a continuous loop tube having at least one longitudinal segment made of filter media and an insert frame encapsulated within the tube. The tube is driven by a roller chain/link chain combination such that the tube is repeatedly inverted and drawn through the frame. A liquid/solid slurry is introduced at one end of the tube and passes through the frame therewith wherein hydrostatic and hydraulic forces urge the liquid outwardly through the filter media which retain the solids until they have passed through the restricted volume of the frame. No lateral seals are required in as much as the tube completely encircles the slurry.

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.

Abstract: The invention relates to an apparatus for separating the flowable constituents from a mixture of flowable and non-flowable constituents particularly for the preparation of foodstuffs, the apparatus includes a driven perforated drum having a perforated circumferential surface, a pressure belt enclosing part of the circumference thereof and pressable onto the same by at least one pressure roller, as well as a supply mechanism for supplying the product to be treated into an entry wedge formed between the perforated drum and the pressure belt.

Abstract: In a filtration apparatus in which a flocculant is added to promote flocculation, efficient use of the flocculant is ensured by measuring an operational parameter of the apparatus dependent on the degree of flocculation, and adjusting the amount of flocculant being added to the minimum that causes maximum flocculation. As the operational parameter, measurement can be made of the depth of a pool of the material at the lower end of an upwardly inclined filter belt, or of the resistance to movement of a part of the apparatus e.g. the torque required to rotate a filter drum.

Abstract: A method for dewatering a slurry of solid particles suspended in a liquid using a twin belt press dewatering system, comprising the following steps:feeding the slurry of solid particles into the dewatering system;feeding a cationic amine salt solution into the dewatering system at a point just prior to the mixing drum, the cationic amine salt being a latex copolymer of acrylamide and dimethylaminoethylmethacrylate sulfuric acid salt having a mole ratio in the range between about 30:70 to 70:30, preferably 53:47;mixing the cationic amine salt solution with the slurry of solid particles in the mixing drum; andfeeding the cationic amine salt solution/slurry mixture to the twin belt press, whereby the slurry of solid particles is dewatered. The cationic amine salt solution having a strength of less than 1% and a polymer concentration of about 35%.

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.