Abstract: Apparatus and methods include an improved filter (203) and cleaning process.

Abstract: A concentration adjustment unit adjusts a concentration of a fiber solution. An element forming unit includes an element forming tank, which receives the concentration-adjusted fiber solution, and a suction jig, which draws the concentration-adjusted fiber solution and accumulates fibers, which are contained in the drawn fiber solution, on a surface of the suction jig to form a filter element. A recovery unit includes a reservoir tank, which reserves recovered water that is drawn and is recovered through the suction jig. A filtration unit is provided in the recovery unit. The filtration unit includes a filter, which filters the recovered water, and jet nozzles, which remove the fibers, which are accumulated on a surface of the filter upon drawing and filtering the recovered water through the filter.

Abstract: A solid and liquid separation device, comprising: a housing, the housing having an inlet, a solid outlet and a liquid outlet, the liquid outlet located in a lower portion of the housing; a screen located within the housing, the screen positioned above the liquid outlet at an inclined angle, wherein a lower end of the screen is directly below the inlet; a conveying assembly, mounted in the housing located above the screen, and including two rotation shafts co-operating with two drive members, a plurality of connecting rods mounted between the two drive chains, each drive chain comprising at least one longitudinally flexible link, each connecting rod including a scraper, the scraper capable of contacting the screen for driving solids toward an upper end of the screen; and, a squeeze assembly, including a cylinder for supporting solids falling from the upper end of the screen, the cylinder provided with a threaded rod that is configured to be driven to rotate by a power member, the threaded rod capable of output

Abstract: An automatic screening apparatus for removing debris from a liquid stream includes a drive mechanism mounted to a support frame. A screen connects to the support frame and collects debris while allowing the liquid to flow through. The drive mechanism positions and interchangeably couples to a first carriage assembly and a second carriage assembly. The first carriage assembly includes a rake that removes the collected debris from the screen. The second carriage assembly includes a bucket that removes the debris collected from the rake. A plunger directs the debris from the rake into the bucket. At selected intervals, the drive mechanism decouples from the first carriage assembly and couples to the second carriage assembly, whereupon the second carriage assembly is positioned to dump the bucket. After dumping the bucket, the drive shaft is decoupled from the second carriage assembly and coupled to the first carriage assembly, whereupon the cycle is repeated.

Abstract: An apparatus for separating solids from a suspension includes a hollow cylindrical column having a central axis therethrough. The column has an interior with a cross-section, perpendicular to said axis, that is constant along said axis, and that extends from a first end to a second end of the column; one central tube axially disposed in said column and extending from said one end toward said opposite end, said central tube having an outer wall of constant diameter, said cylindrical column and said central tube defining an annular zone between them, extending axially from said first end of the column to at least near said second end of the column; at least one filter in said outer wall of the said central tube, forming the only direct communication between the said annular zone and the interior of the tube and at least one filter in the outer wall.

Abstract: A drilling water filter (1) with a self-cleaning system including a filter container (2), a cover (3) and a filter element (6) that can be inserted in the flow arm between an inlet (4) and an outlet (5) for separation of solid material from the fluid. The cover (3) has a displaceable carrying handle (7) for transporting the drilling water filter. The carrying handle (7) is connected with at least one self-cleaning means, in a controlled manner.

Abstract: In an apparatus 10, a space is formed by a pair of impermeable supports 16 and a pair of spacer members 12 for providing a predetermined distance between the impermeable supports 16. A permeable membrane is provided within the space and outlets 15 are provided on each of the pair of impermeable members 16. A stirrer 20 is provided within the space where the permeating object is present, and comprises a stirring axis 22, a driving source for oscillating the stirring axis 22, and a plurality of stirring blades 24 mounted on the stirring axis 22. Cut sections 26 are provided at a portion of each of the stirring blades 24 so that the permeating object can be circulated at the space between the stirring blade 24 and the inner wall of the spacer member 12 or at the space between the stirring blade 24 and the permeable membrane 14. The cut sections are alternately provided at the right and left sides of the layered stirring blades.

Abstract: The present invention relates to stationary cloth media filtration systems and devices, as well as processes and devices for uniform flow distribution and improved cloth media filter backwashing.

Abstract: A fluid filtering device includes a housing, a driving device, a filter and a scraping device. The housing has a top portion, a wall portion downwardly extending from the periphery of the top portion and an inlet disposed in the top portion to allow the entry of fluid. The driving device is disposed above the top portion. The filter is disposed near the bottom surface of the housing. The filtered fluid and the impurities are discharged through the underside and the outside, respectively, of the filter. The scraping device has a connecting element driven by the driving device, a scraping element disposed below the connecting element and abutting the upper edge the filter and a flexible element disposed between the connecting element and the scraping element and exerting a constant downward force on the scraping element. Therefore, this invention can provide a fluid filtering device that is structurally simple, may be further miniaturized and may be used in various types of places.

Abstract: Apparatus and methods include an improved filter (203) and cleaning process.

Abstract: Methods and apparatus for increasing the continuous filtering flow rate through a pressure liquid filter unit of liquid-to-be-filtered having (1) a carrier liquid, (2) coalescing solids particles which tend to adhere and bridge filter clement gaps sized substantially larger than said particles and (3) larger impurity elements to be filtered out of the liquid-to-be-filtered and sized larger than such filter element gap. A pressure liquid filter unit containing a filter element having gaps, a given gap being sized to reliably pass the carrier liquid and coalescing solids particles at a first relatively low liquid flow rate, but blocking coalescing solids particles passage therethrough due to bridging of said gaps by the coalescing solids particles at a relatively high liquid flow rate.

Abstract: An apparatus for filtering suspended solids from a liquid having a group of filters mounted inside a filter chamber. The filters divide the chamber into dirty liquid chambers and clean liquid chambers. A wash assembly is disposed within the chamber having vacuum/pump heads in contact with the filters rotates within the chamber. The vacuum/pump heads are connected to a pump and vacuum source located either within or without the apparatus. The vacuum/pump heads either vacuum material up or spray material therefrom in order to clean the filters. As the wash assembly rotates, the vacuum heads are able to contact and clean the entire surface of the filters.

Abstract: A description is given of equipment for filtering liquids, comprising three sections superimposed coaxially and placed above a container with filter walls for collecting the filtered particles. From the top to the bottom, the first section communicates directly with the second, while the second communicates with the third sector, and the latter communicates with the container via two valves. A pump introduces the liquid to be filtered into the first section, inside a filter layer, and another pump projects a quantity of the previously filtered liquid against the filter layer from the inside of the first section. By cyclically operating the valves it is possible to continuously filter the liquid, which flows out in the filtered state from ducts which branch from the first section, even while the particles deposited in the third section are discharged into a container with filter walls which is immersed in a vessel containing the liquid to be filtered.

Abstract: A reusable, ecological, long lasting, washable, non disposable filter for lubricant oils and fuels to be used in internal combustion engines or in any other equipment to help prolong the live of the lubricant oils and equipmen One or several essentially cylindrical independent filtering element place one inside the other, each filtering element consisting of a fine stainless steel cloth of a different mesh as needed for an optimal filtration, filtering out large, medium and small particles down to 5 microns if needed. The fin stainless steel cloth is enclosed in and retained by an open mesh and a number of rods that forms a cage extending longitudinally between two en caps being joint to form an assembly of a single unit by resin caps at each en thus forming an independent, leak proof filtering element that keeps the fine stainless steel cloth in position even during cleaning procedure that includes pressurized air that is forced through.

Abstract: Apparatus for the screening of fiber suspensions is disclosed including a housing, a reject outlet and an accept outlet, a screen located within the housing, a rotor including pulsation wings mounted therein, a reject chamber in the housing for collecting a reject portion of the fiber suspension, and an accept chamber for collecting the accept portion of the fiber suspension passing through the screen and supplying it to the accept outlet, each of the pulsation wings including an outside face and an inside face, a leading edge, a trailing edge, and upper and lower ends so that a predetermined pressure difference is created between the outside and inside faces of the pulsation wings in the direction of the lower edge thereof.

Abstract: A method dealing with an overflow capacity of a fluid screening system is disclosed, the system (20) including a first screen (22) for screening objects of a first predetermined size from a fluid channel (21) the method comprising the step of: providing an ancillary screening system (23) upstream of the screen (22) and operational upon fluid within the channel (21) reaching a predetermined limit, the ancillary screening system screening objects of a second predetermined size from the fluid channel (21). The second predetermined size can be less than the first predetermined size. The ancillary screening system preferably can include a screen (23) placed substantially tangentially to the main flow of fluid within the fluid channel and includes a raking mechanism for cleaning objects lodged substantially adjacent the ancillary screening system. The output of the ancillary screening system can be interconnected to the fluid channel downstream of the first screen (22).

Abstract: Process for the filtration of paper pulp with a device that comprises a rotor and a stator; one of the two, filter (1), has perforations of slot or hole types, and the other, the backwashing element, includes means that are intended to generate pressure pulses that consist in combatting the gradual clogging of the perforations of the filter and the gradual flocculation of the pulp during the creep of the pulp between the rotor and the stator by creating deflocculation zones and/or increasing the relative speed between the pulp and the backwashing elements.

Abstract: A screen for cleaning a pulp suspension including an additional screen basket in the infeed area for pre-screening.

Abstract: A solid and liquid separation device, comprising: a housing, the housing having an inlet, a solid outlet and a liquid outlet, the liquid outlet located in a lower portion of the housing; a screen located within the housing, the screen positioned above the liquid outlet at an inclined angle, wherein a lower end of the screen is directly below the inlet; a conveying assembly, mounted in the housing located above the screen, and including two rotation shafts co-operating with two drive members, a plurality of connecting rods mounted between the two drive chains, each drive chain comprising at least one longitudinally flexible link, each connecting rod including a scraper, the scraper capable of contacting the screen for driving solids toward an upper end of the screen; and, a squeeze assembly, including a cylinder for supporting solids falling from the upper end of the screen, the cylinder provided with a threaded rod that is configured to be driven to rotate by a power member, the threaded rod capable of output

Abstract: A method and apparatus for filtering a slurry utilizing a displacement filtering principle. The filter apparatus desirably includes an inner filter and an outer filter. Both the inner and outer filters are preferably substantially annular in shape and positioned concentrically with respect to each other. A particulate collection volume is at least partially defined between the inner and outer filter. The method includes directing a flow of slurry into the particulate collection volume under sufficient pressure to force fluid within the particulate collection volume through one of the inner and outer filters and any particulate matter blocking a filtering surface of the inner and outer filters.

Abstract: A screen for cleaning a pulp suspension includes a stationary installation in the infeed area between the infeed branch and the free end of the rotor.

Abstract: The invention relates to a screening/sieving device for waste waters. The device according to the invention is mainly suitable for a plant in a channel. It serves to separate particles whose size exceeds a few millimetres, from the waste water. The device according to the invention consists of a frame, inside which bars are stretched at some distance from each other. Cleaning is carried out by a “comb” which slides between the bars and which deposits the waste onto a second comb located outside the frame.

Abstract: A back flushable filter comprising a body (15), a raw feed inlet (1), a filtrate product outlet (14), a back flush media inlet (12) and a back flush waste outlet (2). A a filtration element (7) is used which provides filtration when in a compressed, sealed state and can be back flushed clean when released in a loosened state. During filtration, raw feed water passes through an inlet port (3), impacts upon and exits radially with swirl from a centrifugal impact impeller (5) mounted in conjunction with the upstream side of the filter element sealing plunger (6). The swirling raw feed water passes adjacent to and then into and through the filtration element (7). The filtrate then exits the internal filtrate sector of the filtration element (7) via the filtrate port (11) past the open filtrate valve (21), into the filtrate plenum (16) and is discharged via the filtrate outlet (14).

Abstract: The present invention is a device and method for clearing debris from fluid channels. In one embodiment, the device has a fixed screening member that is permeable in part wherein debris will collect. A movable scraper then scrapes along the screen and removes the debris therefrom and transports the debris to a desired location. In embodiments of the invention, the surface that comprises the screening member may be arcuate, and may be a surface of revolution. Different portions of the screening member may or may not be permeable. The invention may also include an overflow mechanism where overflow water is diverted into a separate unscreened fluid stream. Further, the invention may be suitable for use within a sump.

Abstract: A self-cleaning, back-washable filter apparatus and method for use with a pumping apparatus which is lowered into a well casing. The filter apparatus includes a filter basket having a manifold with several tubes extending therefrom. A filter sock encases at least a portion of the filter basket to block sand or other solid particles from entry into the pump intake. Pressurized gas or fluid is directed to the manifold and then through perforations or jets distributed along the length of the tubes. Bursts of the pressurized gas are directed from the perforations or jets to the interior of the filter apparatus and then sprayed from the perforations or jets in an outwardly direction against interior surfaces of the filter sock. Air or fluid bursts from the perforations impinge upon the interior surfaces of the filter sock and dislodge or expel entrapped particulate material.

Abstract: A self-cleaning, back-washable filter apparatus and method for use with a pumping apparatus which is lowered into a well casing. The filter apparatus includes a filter basket having a manifold with several tubes extending therefrom. A filter sock encases at least a portion of the filter basket to block sand or other solid particles from entry into the pump intake. Pressurized gas or fluid is directed to the manifold and then through perforations or jets distributed along the length of the tubes. Bursts of the pressurized gas are directed from the perforations or jets to the interior of the filter apparatus and then sprayed from the perforations or jets in an outwardly direction against interior surfaces of the filter sock. Air or fluid bursts from the perforations impinge upon the interior surfaces of the filter sock and dislodge or expel entrapped particulate material.

Abstract: A machine tool for metal cutting having a collecting system for chips and liquids. Disposed below the work area is a pan having a transverse groove, a chip conveyor disposed in the transverse groove, a spiral-shaped conveyor element, a liquid collector on one side wall of the pan and a chip outlet disposed on the other side wall of the pan on the outlet end of the chip conveyor. To enhance the separation of liquids even when a large amount of chips is produced, an elongated screen element is disposed in the inner cavity of the spiral-shaped conveyor element, the screen element extending over at least part of the length of the conveyor element and terminating at the liquid collector.

Abstract: A screen, for screening material used in the production of paper, board and the like, having a screen basket and a rotor supporting several blades which can be moved along the wall of the screen basket when the rotor rotates. The blades having a convex curvature on the side facing the screen basket. The radial clearance between the surface of the blade facing the screen and the screen being lowest between the front sector, viewed in the direction of rotation, and increasing towards the rear edge of the blade.

Abstract: The bar screen of the present invention includes a bar rack and a cleaning rake. The bar rack includes a plurality of aligned bars and is adapted to be at least partially positioned within the channeled water. The cleaning rake is movably coupled to the bar rack and includes a plurality of tooth segments. Each tooth segment includes a base portion and a plurality of teeth. The base portion is coupled to the cleaning rake, and the plurality of teeth is connected to the base portion. Each tooth of the plurality of teeth is adapted to be inserted between adjacent bars on the bar rack to remove debris that has accumulated on the upstream side of the bar rack. The teeth are breakable from the base when the teeth engage immovable debris trapped within the bar rack.

Abstract: A self-cleaning water filter assembly including a body having inlet and outlet portions and a filter housing portion defining a cavity disposed therebetween so that water entering the inlet must flow through an inner surface to an outer surface of a filter then to the outlet. A piston disposed concentrically within the filter is biased in an upward resting position by a spring in the absence of water pressure. A scraper extends radially from a piston sidewall and into contact with the inner surface of the filter. Apertures extend through the sidewall and into a central bore extending through a bottom end of the piston. In the presence of water pressure, the piston is forced downwardly into the cavity, and the scraper and apertures cooperatively dislodge and flush filtered particulate matter from the housing. As water pressure is reduced, the piston is biased into its upward resting position, dislodging and flushing filtered particulate matter again.

Abstract: The present invention is a screening/washing/dewatering system which utilizes a solids handling pump to vacuum solids captured from a contaminated fluid stream from the system's screening mechanism and to convey them, in a concentrated form and through a closed conduit, to the washing/dewatering mechanism. The use of a solids handling pump enables a screening, washing and dewatering system to contain the captured solids in a completely closed system from their point of capture, through a conveyance system of unlimited length and configuration, to the point that the washed, dewatered screenings are finally discharged. Secondarily, the present invention offers the advantages of being able to capture as small of a solids particle size as is desirable and of providing effective washing and dewatering of the captured particles while minimizing the number of moving parts and maximizing the overall system reliability.

Abstract: The invention relates to a silo for sludge, especially sewage sludge, comprising a sludge-receiving part (12), a feeding part (16), said feeding part being located above the sludge-receiving part (12) and communicating with said sludge-receiving part (12) via a inlet (14), and a sludge-discharge device. Said sludge-discharge device is located in the lower area of the sludge-receiving part, and can preferably be connected to a pipeline system. According to the invention, a separator device (18) for removing foreign bodies is located in the area of the feeding part (16) so that the sludge which is temporarily stored in the silo can easily be used later on. Said separating device for removing foreign bodies (18) has a sieve grate (20) covering the inlet (14) and at least one counter-surface (22) positioned above said sieve-grate (20). Said sieve-grate and said counter-surface are able to move in relation to each other as sludge pushes through the sieve openings of said sieve-grate.

Abstract: Horizontal solids recycler to treat waste water comprising refuse solids from hog farms which comprises an intake and loading hopper adapted to establish a uniform curtain of the waste water, a mesh to which an over flow of the waste water is directed, a tumbler cilinder to which is mounted the mesh and which is mounted to a frame which rests on guide wheels, blades mounted within the tumbler cilinder to raise moistured solids, wherein said water of said moistured solids is passed through a mesh, a collecting bin to collect the solids coming from the tumbler cilinder and raised by the blades which comprises a separator to separate the remaining water from the solids, a screw to transport the solids, which is mounted to the collecting bin, a pressing section which comprises a perforated cilinder to which the solids are fed by the screw, a collecting and recycling hopper to which said perforated cilinder is mounted to, and which said collecting and recycling hopper collects and recycles the wastewater to the tu

Abstract: A strainer for immersion in liquid, especially shallow water, to prevent debris from entering a pump connected by a suction pipe to the interior of the strainer. The strainer has a cylindrical housing that is closed at the bottom and covered by a circular screen at the top. As the pump sucks water, the screen prevents debris from being sucked into the strainer interior along with the water. Debris drawn against the screen's exterior is dislodged by a rotating spray arm that contains nozzles and is disposed within the strainer interior to spray water against the screen. The water is fed under pressure to the spray arm through a separate supply line tapped into the pump's outlet. The spray arm nozzles are aimed to direct water generally upward through the screen to dislodge the debris and to cause the spray arm to rotate. Hence, as the spray arm spins, the water washes substantially the full face of the screen.

Abstract: An agitator assembly for use within a sieve during automotive painting and cleaning operations has flutes consisting of circular conical discs aligned within the sieve by means of a magnetized cylinder extending through the flute or by means of a collar attached to said flute.

Abstract: A filtering apparatus of T-shaped configuration includes a vertically extending filter element receiving tube and a horizontally extending outlet conduit portion. A removable tubular filtering element having a flexible seal surrounding the outer surface of the filter element at a lower end is engagable with an inner surface of the filter element receiving tube. A stationary filter element is disposed at a juncture of the outlet conduit with a central opening in the vertically extending filter element receiving tube wherein the flexible seal of the filter engages with and cleans the particulates from the stationary filter element upon insertion and removal of the tubular filtering element from the filter element receiving portion.

Abstract: A back-flushing method is practiced with a back-flushing filter construction wherein a perforate filter screen providing filter openings also forms an internal chamber for receiving the effluent from a liquid stream. A filter piston is disposed in the internal chamber and operates to divide the chamber into first and second zones on opposite sides of the piston. By selectively reciprocating the piston, the effluent in the chamber is compressed and moved on both sides of the piston. Thus, the effluent back-flushes the filter openings and creates a rolling action in the liquid surrounding the filter screen on the upstream side to dislodge particulate debris accumulated on the filter screen.

Abstract: The self-cleaning filter is used for filtering incoming dirty liquid and distinctly recuperating clean liquid and waste liquid.

Abstract: A rake cleaning arrangement for a trashrack situated in front of the intake opening of a turbine arrangement, wherein the turbine arrangement is arranged in a weir opening delimited at its sides by two pillars and these pillars delimiting the weir opening are spanned by at least one gangway forming a service platform, comprises a bridge forming a service platform which can be lowered into the weir opening by a crane arranged on top of or on the gangway, and a skimming arrangement for removing flotsam from the trashrack by which a tool can travel along the vertical extent of the trashrack and which is arranged on the bridge, wherein the tool can travel along the vertical extent of the trashrack by the skimming arrangement when the bridge is stationary.

Abstract: The strainer arrangement is adapted for straining a liquid from a mixing arrangement, such as a mixing tank, containing black liquor including solid particles of ash. The strainer arrangement comprises a strainer pipe with axial gaps defined therein for permitting a radial inflow of liquid into the strainer pipe. An axially movable shaft is disposed inside the strainer pipe and has cleaning pins attached thereto that extend into the gaps.

Abstract: Methods and apparatus for increasing the continuous filtering flow rate through a pressure liquid filter unit of liquid-to-be-filtered having (1) a carrier liquid, (2) coalescing solids particles which tend to adhere and bridge filter element gaps sized substantially larger than said particles and (3) larger impurity elements to be filtered out of the liquid-to-be-filtered and sized larger than such filter element gap. A pressure liquid filter unit contains a filter element having gaps, a given gap being sized to reliably pass the carrier liquid and coalescing solids particles at a first relatively low liquid flow rate, but blocking coalescing solids particles passage therethrough due to bridging of said gaps by the coalescing solids particles at a relatively high liquid flow rate.

Abstract: The present invention provides a concentration type aggregation reaction apparatus having a concentration screen, which enables an aggregation reaction to be conducted in sludge and the sludge to be concentrated by separation of a liquid by means of a single apparatus. The concentration screen is in a cylindrical form and includes slits having horizontal openings. A decelerating device is connected to an upper portion of a shaft for an agitator for agitation in the tank and brushes are connected to the decelerating device. The brushes are adapted to revolve along opposite surfaces (on a primary side and a secondary side) of the screen. By use of these brushes, aggregates adhered to the screen are continuously removed.

Abstract: The invention concerns an apparatus for cleaning liquid fluids, in particular for the cooling water running to a heat exchanger, having a portion of pipe of circular cross section as a housing, a screening body and a suction device, which can be moved about an axis, on the inflow side for regional suction removal and consequently for cleaning the screening body.

Abstract: The present invention is a screening/washing/dewatering system which utilizes a solids handling pump to vacuum solids captured from a contaminated fluid stream from the system's screening mechanism and to convey them, in a concentrated form and through a closed conduit, to the washing/dewatering mechanism. The use of a solids handling pump enables a screening, washing and dewatering system to contain the captured solids in a completely closed system from their point of capture, through a conveyance system of unlimited length and configuration, to the point that the washed, dewatered screenings are finally discharged. Secondarily, the present invention offers the advantages of being able to capture as small of a solids particle size as is desirable and of providing effective washing and dewatering of the captured particles while minimizing the number of moving parts and maximizing the overall system reliability.

Abstract: A chip treatment device 100 includes a box-shaped housing 110, and an upper surface panel 112 of the housing is connected to a sloped portion 114. The interiors of the housing 110 is divided into upper and lower areas by a partition panel 130, and to the areas are provided a first cutting fluid bath 150 and a second cutting fluid bath 160. Chains 240 stretched between driving sprockets 210 and chain guide units 230 are equipped with scraper units 250 moving in the direction of the arrow. The chips coming in from an entrance opening 180 is separated from cutting fluid while being conveyed on the separation panel 130. First and second filter units 170, 300 filter said cutting fluid.

Abstract: A fluid filter comprising a housing defining a fluid inlet and a fluid outlet, a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis, and backflushing means for removing filtered out sediment from the filter element comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head.

Abstract: An apparatus for separating solids from a liquid includes a housing with two spaced-apart side walls, a plurality of parallel looped barrier members disposed side-by-side between the side walls for trapping solid matter, a circulating unit, a driving source unit for activating the circulating unit, and a plurality of moving plates mounted on the circulating unit and moved by the circulating unit along a looped path. The barrier members are spaced-apart from one another so as to define a plurality of looped pathways among adjacent pairs of the barrier members. Each moving plate extends into and moves along a respective one of the looped pathways when the driving source unit is activated so as to remove the solid matter from the barrier members.

Abstract: A rotating brush assembly for cleaning shellfish predator screens is provided.

Abstract: Sewage treatment intended for separating solids and liquids under gravity, particularly for sludge from sewage works, comprising a flat and stationary thickening or drainage grating onto which the sludge is continuously conveyed, this sludge being constantly scraped by a scraping system with flexible blades. The grating is made up of a number of strips, the spacings of which vary along their lengths, the characteristics of the spacings between the strips of the grating and their variations being defined on the basis of the nature of the solid-liquid suspension to the thickened, of its concentration, and of the feed-rate of the plant.

Abstract: A fluid filter comprising a housing defining a fluid inlet and a fluid outlet, a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis, and backflushing means for removing filtered out sediment from the filter element comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head.