Abstract: An endless filter chain for filtering a liquid, such as sewage, which flows along a drainage duct is provided. The filter chain comprises strainer elements and connecting links interconnected to allow the strainer elements to pivot about respective axes of the connecting links while maintaining a small clearance between the leading edge of each strainer element and the trailing edge of the respective adjacent preceding element while the filter chain is trained about an upper and a lower turning roller. the filter chain does not comprise conveyor chains and the strainer elements can be sized to a width where they cover practically the entire width of the drainage duct. A method and an apparatus for filtering liquid as well as a strainer element and a connecting link are provided.

Abstract: A screen assembly is described which comprises a flow channel along which sewage is intended to flow, in use, a continuous flexible belt entrained around roller or wheel means and projecting into the channel, and means for driving the belt. The belt is perforated such that relatively large solids carried along the flow channel in the sewage are trapped by the belt adhering thereto due to a pressure differential across the belt. Movement of the belt lifts such solids from the flow channel. The belt is of thickness less than or equal to 1 mm.

Abstract: A device for removing floating and suspended debris from a liquid flow passed through a liquid flow flume (3) is disclosed, the device including a separator (9) positioned within the liquid flow flume at an angle with respect to the flume and extending across the path of the liquid stream for collecting floating and suspended debris thereon. An elongated conveyor assembly (10) having an elongated tubular housing (20) with a first conveyor portion (11) and a second conveyor portion (12) is also provided as a part of the device. The first conveyor portion of the conveyor assembly is positioned within the separator and extends therefrom, the first portion of the conveyor assembly, as well as the conveyor assembly, being independently supported with respect to, and without being formed as a part of, the separator.

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: The invention relates to an apparatus for removing solid components from a fluid in a trough (1) having a transport device (3) in the form of a transport trough (4) and a rotationally driven transport helix (6), the transport device (3) having at one end a solids outlet (9) and at the opposite end a sieving surface (15) at least in portions of the surface, in which the solid components are able to be sieved out of the fluid and are able to be transported to the solids outlet (9) via the transport helix (6) in the axial direction of the transport device (3).

Abstract: Conveyor-band filter apparatuses, so-called Paternoster filter rakes, which serve primarily for the mechanical cleansing of flowing sewage, are to be made capable by the invention of removing not only the normal filtered material, but also coarser fragments, from the conduit through which the sewage flows, without the usually steep conveying angle having to be varied; for this purpose, filter elements of the endless filter band are arranged in each case on the chain links and are designed on their end faces in such a way that only a small gap remains even in the state in which they are mutually pivoted relative to one another. Furthermore, attached to the filter elements are filter rakes forming a horizontal lifting face which extends transversely through the conduit and which can nevertheless be kept clean by corresponding stripping devices.

Abstract: A separating grid (1) for collection and removal of solid particles and objects (4) from running water (2) in a channel (2). The separating grid (1) comprises a stand (9) including a separating unit (10) formed by separating grid bars (11, 12) positioned side by side in such a manner that fixed grid bars (11) alternate with mobile grid bars (12), said grid bars formed with collection and removal means (13). The fixed grid bars (11) are securely attached to the stand whereas the mobile grid bars (12) are connected at their upper ends (17) to a drive unit (18) and at their lower ends (16) they are arranged for controlled movement in the stand. The drive unit imparts to the mobile grid bars a movement which at the upper end of the bars follows a closed path but in a direction towards their lower ends follows successively and increasingly flattened, elliptical paths changing at the lower ends into an essentially rectilinear to-and-fro movement path.

Abstract: The invention concerns a screening rake for removing solids from flowing sewage, the rake having a driven screening belt which can be immersed in the sewage and which has two lateral chains. A group of screening elements fitted with hooks is mounted on each of two support rods independently of the preceding and following group of screening elements. The screening elements in each group have extension pieces which project beyond the two associated support rods in the direction of travel of the screening belt and in the opposite direction. The extension pieces of successive groups of screening elements engage with each other like the teeth of a comb.

Abstract: A long sand trap for separating and removing sand from inflow channels, particularly of sewage treatment plants is provided with a settling channel (1) having in particular a trapezoidal cross-section and extending along a straight path. A transporting conveyor device (8) which is acting opposite to the direction of flow is provided in the bottom area (6). A classifying conveyor device (10) discharges the sand delivered from the transporting conveyor device (8) in an upwardly inclined manner. The classifying conveyor device (10) is arranged in the central longitudinal plane (3) of the settling channel (1). It has a discharge chute (17) which can be used selectively left-hand or right-hand.

Abstract: Apparatus for separating solids and liquids has an initial separator for removing coarse solid material from a mixture of solids and liquids, a first screen for separating further solid material from the liquid and a first auger extending axially through the first cylindrical screen for removing the separated further solid material from the first cylindrical screen. A second screen receives the liquid from the first screen and separates fine particles from the liquid, and a compactor between the first and second screens compacts the solid material removed from the first screen by the first auger. A second auger is provided in the second screen for mixing and removing the compacted solid material and the separated fine particles.

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: An improved rotary screen for high volume water screening includes a rectangular truss having a forward bearing surface supporting a rotary screen element supported by a central rotating hub and a plurality of radial beams connecting to a peripheral beam. A curved support on the truss forward surface transfers screen load during use between the peripheral beam to the truss.

Abstract: Apparatus for separating liquids and solids, comprising, separator screen means for receiving and separating the solids and liquids, conveyor means for feeding the separated solids upwardly from the separator screen means, and compactor means for compacting the solids, the conveyor means comprising a first conveyor extending at a first upward inclination through the separator screen means and a second conveyor extending further upwardly and at a greater inclination than the first conveyor means.

Abstract: An apparatus is described which separates small solids from process waste water. A continuously rotating elongated drum screen having a large diameter interior flow channel removes the solids. The drum screen contains a continuous loop of closely spaced link members each having a foot at one end projecting towards the interior of the drum chambr. Pivot members are connected to the links and these pivot members are driven by lugs attached to an endless loop chain. The chain is driven by variable speed motors. A flushing system mounted on top of the drum screen washes solids into a hopper where liquid is returned to the drum inner chamber and solids are sent to solid waste disposal.

Abstract: A separating apparatus, in particular for clarification plants, comprises a revolving strainer rake or rake sieve having a plurality of series connected rake sieve sections which each consist of adjacently disposed hook-like plates, each plate having a hook portion projecting from the front end edge, wherein the thickness of each plate decreases from the front end edge in the direction towards the rear end edge and a stationary cleaning comb adapted to engage said strainer rake sieve sections from said front edges of said hook-like plate portions.

Abstract: Apparatus for collecting and discharging waste material comprises peripheral rows of teeth arranged on rotatable cylindrical shafts. The teeth on each shaft intercalate so that an entrapment zone for waste material is formed thereat during contra-wise rotation of the shafts. The teeth in each row pass through respective slits formed between the blade edges of rectilinear scaper blades placed between the rows and resting on the shaft. The scraper blades remove waste material from and between the teeth for discharge from the machine.

Abstract: A method and an apparatus for separating bodies from a liquid in which the liquid is passed through a filter and the bodies to be separated are accumulated on the filter. The filter forms an upper bounding limit of a space therebeneath which is alternately subjected to pressure and vacuum relative to the ambient region above the filter. This is achieved according to one embodiment by producing a reciprocal movement of the filter in the form of an oscillating or pendular movement. The pressurization in the space produces separation of the bodies accumulated on the upper surface of the filter to facilitate their discharge from the filter. The separated bodies can be assisted for discharge by mechanical elements and/or by producing wave motion in the liquid.

Abstract: A device for collecting and discharging solid matter from a liquid-solid mixture in a waste collecting stream having a grid structure including alternate stationary and displaceable bars, the displaceable bars being interconnected so as to rotate as one unit, and a drive mechanism used to impart rotational motion to said displaceable bars.

Abstract: A device for removing waste material screened or filtered out of liquid flowing through a channel (1) has a basket-type interceptor (6) that is slanted and cylindrical and that rotates subject to power, extends to some extent into the liquid, and has its upstream face (8) open and its downstream face (9) solid. A conveyor (13) is positioned coaxially in relation to the interceptor, leads to a waste-material deposit point outside the liquid, accommodates a powered conveyor screw (18), and has an intake scoop (15) in the vicinity of the interceptor for collecting the waste material. A mechanism positioned stationary above the intake scoop releases waste material from the interceptor. The interceptor consists of a number of continuous annular disks (8) distributed along the outer surface with gaps between them and the waste-material releasing mechanism is a raker-stripper (28) that at least to some extent extends through the gaps between the annular disks.

Abstract: A filter that can be inserted into a pressurized pipe comprises a filter body designed to be connected to each of two consecutive section of the pipe. Inside the filter body is a generally circular filter member which is rotatable about an axis of the filter body, into which it projects cantilever-fashion. A rim on the filter member carries a rack meshing with a drive wheel. A suction unit on the upstream side of the filter member and disposed along a radius of the filter member is connected to a take-off pipe.

Abstract: An apparatus is described which separates small solids from process waste water. A continuously rotating elongated drum screen in a three foot diameter flow channel removes the solids. The solids are deposited by spray wash into a dewatering chamber. The screen components include row of closely spaced links and pivot members connected end-to-end to form a continuous loop mounted within a frame driven by a variable speed motor.

Abstract: A self-cleaning trash rack for removing debris from a stream of water has an upright frame positioned in the path of trash carried by the stream and a plurality of endless, flexible chains carrying trash supports which engage and carry debris on the upstream side of the frame upwardly for disposal. Each chain has sufficient slack to enable any trash support on the upstream side of the frame to rock in such direction as to release debris that is too heavy to be carried upwardly by such trash support.

Abstract: Apparatus for the release and recovery of living organisms collected or trapped on the rotary filters of water pumping stations.The apparatus comprises:on the inside of the filters, a system of two rows of multiple washing jets using water under low pressure, whose nozzles are directed towards the filter panels, so that the jets of the two rows meet one another and cooperate to form a single liquid stream;deflectors arranged at radial intervals on the outer face of the filter panels;on the outside of the filters, a channel shaped like a trough for receiving the washing water and recovering the living organisms, whose opening is oriented towards the said rows of washing jets, the edge of the opening being rounded or rotary in its lower part.

Abstract: A device for removing screened or sifted material from liquid flowing in a gutter (1) has a sloping cylindrical grizzly (11) that is mounted in the gutter, that is partly immersed in the liquid, and that has a face that is open upstream and closed downstream. The device also has a conveyor (5) that is positioned coaxial to the grizzly, that leads to an ejection point (18) outside of the liquid, and that has a powered shaft (7) and a housing (6). The conveyor has an intake funnel (9) for the screened or sifted material in the vicinity of the grizzly. The device also has a separator (15) for the screened or sifted material positioned above the intake funnel. The grizzly (11) is rotated. The separator (15) is positioned stationary on the outside of the grizzly (11) and releases screened or sifted material that adheres to the inside of the grizzly.

Abstract: A rotating self-cleaning screen capable of functioning as a dredge cutterhead, and also usable to screen debris from a conduit. A motor-driven rotating drum screen having openings defined in the periphery thereof includes a debris ejector rotating about an axis parallel to the drum screen axis utilizing a plurality of teeth which synchronously extend through the screen openings at a predetermined peripheral location ejecting debris from the screen openings. Apparatus is provided for stripping the debris from the teeth, and receiving debris removed from the screen.

Abstract: An industrial water intake comprising a screen for screening water and a spray nozzle for detaching deposited debris from the screen and entraining it into a debris recovery channel on the other side of the screen from the spray nozzle. A cylindrical rotary member comprising a roller is arranged along the adjacent longitudinal edge of the debris recover channel. The rotary member rotates in a direction tending to carry debris falling on or coming in contact with the longitudinal edge into the channel to prevent the build up of debris thereon. The rotary member extends above and is disposed inwardly of the longitudinal edge relative to the debris recovery channel. The rotary member is usable on recovery channels for band screens, drum screens or even bar screens associated with trash rakes.

Abstract: A trash rake is disclosed for cleaning the bars of a water intake bar screen. A carriage carrying a pan is mounted for movement parallel to the bar screen. Along the transverse edge of the pan proximate to the screen is a rake member whose teeth are received between adjacent bars during one direction of displacement of the carriage. A watertight recovery gutter for collecting foreign bodies, including living creatures, is arranged in continuity with the rake member and maintains the foreign bodies in water during the ascent of the pan. Preferably, the recovery gutter has a trapezoidal cross section and a transverse wall portion running directly into the rake member which makes an angle of at least 30.degree. with a horizontal plane when the rake member engages the bar screen.

Abstract: A traveling water screen has trays that travel one after the other along a path in the form of a vertical loop. Adjacent trays are connected for articulation about an axis extending transversely of the path. Each tray has a transverse member extending parallel and adjacent to the axis, with one member leading the other member in the direction of tray travel. The trailing member has a cross-sectional shape that extends linearly outward of the loop and curves about the axis of articulation both outwardly and forwardly relative to the path of travel. The leading member has a cross-sectional shape that extends outwardly of the loop beyond the curved portion of the trailing member to an outer edge where an extension projects rearwardly towards the curved portion. A flexible seal that is mounted on the leading member overlaps and contacts the curved portion of the trailing member on the opposite side thereof from the axis of articulation.

Abstract: A water intake screen installation has a traveling water screen unit, that is positioned between a water intake and a stream of water flowing in a channel, to strain a quantity of water diverging from the channel stream towards the water intake. The screen unit includes an endless belt strainer in the form of a loop and a drive for revolving the strainer. The strainer has a screening surface, that extends in a predetermined direction of stream flow in the channel and in an upwardly direction. Means are provided for directing a backwash current, through the screening surface, towards the stream of water flowing in the channel, at an elevation below the stream surface. Material, such as refuse and aquatic life, retained on the screening surface can be dislodged by the backwash current. This current forces such material backwardly from the screening surface, into the stream of water flowing in the channel, to be carried away therewith.

Abstract: A water intake device comprising a substantially cylindrical rotatable screen adapted to be at least partially submerged in a body of water, means for rotating said screen, a water supply conduit communicating with the interior of said screen to receive water flowing through said screen, means for backwashing a section of said screen as said screen moves by said backwashing means so as to clear and/or remove objects or fish caught on the exterior surface of said screen and duct means associated with said backwashing means to provide or define a flow channel or path to guide and/or carry the objects or fish away from the influence or suction of the water entering said screen to said water supply conduit.

Abstract: An improved bar screen is disclosed which has a plurality of ring bars and a plurality of scrapers mounted therebetween which are rockable away from the ring bars. Since base portion of the scrapers is always engaged between the ring bars, the scrapers may be easily reset into their operative position after they have been rotated to their cleaning position away from the ring bars.

Abstract: A cleaning method of an etched disc filter and the system therefor, in which a plurality of discs having grooved surfaces are assembled or piled one on top of another. This filter is used for removing cruds and the like in a nuclear plant. For separating cruds and the like from small flow passages provided between each two of the discs thus assembled, reverse cleaning is applied, with the discs relieved from an assembled or piled condition for providing clearances among the discs.

Abstract: A fine mesh, cylindrical screen is mounted on a cylindrical support lengthwise of a ditch and rotated about its axis. The screen is over half submerged, such as leaving 30% of its area above the normal water level. The rotating screen, at its downstream end, abuts the pipe through which the water flows to a pump for supplying the sprinklers.As the screen rides up out of the water, the sediment clings to it. At the downstream end is a nozzle which discharges a jet of water to move the sediment longitudinally and to a position of engagement with a jet of water from a second nozzle spaced both longitudinally and circumferentially from the first nozzle. These nozzles are included in a series of nozzles which are similarly spaced to the upstream end, with the jet from the last nozzle moving the collected sediment to a position engageable by a suction nozzle just before the screen reenters the water.A special dam downstream from the screen normally insures that the water at the screen will be at the desired level.

Abstract: Apparatus for removing solid material from a flow of sewage or other liquid, the apparatus having a duct through which in use sewage will flow and two screens located in said duct adjacent to each other, one of said screens being arranged to receive solid material filtered from the sewage flow by the other screen and there being also provided a vertically reciprocable lifting plate which is adapted to collect solid material from said one screen and lift it to a position which is above the upper surface of the flow of sewage.

Abstract: This invention discloses apparatus for freeing water or other liquids of accumulated water-borne matter so that the liquid may be used again. It comprises a liquid holding tank through which an inclined conveyor belt of fine mesh woven wire runs upwardly in an inclined manner from a zone near the bottom of the tank at the waste water input end to a discharge zone at a higher point in the tank on the opposite side, and thereafter the conveyor belt runs horizontally for a short distance and then turns upon itself for a return run back to the lower portion of the tank where it started. The collected floating refuse is filtered out by passing through both runs of the conveyor belt and is washed off at the upper end of the belt into a collecting refuse collector.

Abstract: An apparatus provides for continuous filtration of a mother liquor and continuous removal of solids from the filter element so that the apparatus need not be shut down for cleaning or replacement of the filter element. The solids are separated from the mother liquor as a concentrated suspension and the apparatus can be replicated in stages using successively finer filters so that a filtrate free of particles above any specified particle size can be obtained.

Abstract: An endless screen extends around an upper roller, above the stream of a ditch or the like, and a lower roller, submerged in the stream. A cleaning brush engages the underside of the lower reach of the screen, the brush rotating in a direction opposite to the movement of the screen, while a roller or rod supports the screen just below the brush. The brush may be driven directly from a motor and speed reducer, with a belt drive to an upper pulley producing further speed reduction, or a speed reduction drive between the motor and the brush with a belt or chain drive to the upper roller may be utilized.The lower roller for the screen has a fixed center surmounted by a plastic or rubber bushing about which a cylinder of the lower roller rotates.A weir directs water onto the screen, the weir including a transverse partition mounted in the ditch and having a rectangular slot therein.