Abstract: A seal for preventing the bypass of solids from a filter screen assembly that can be used in water and wastewater treatment. The seal can include an L-shaped bracket and a housing that can include a channel-shaped member. A first panel of the L-shaped bracket can be inserted into a groove of a belt of the filter screen assembly so as to fill that groove. The belt can be insertably received into a channel recess of the channel-shaped member of the housing. A second panel of the L-shaped bracket can be fastened to one side wall of the channel-shaped member. By securing the L-shaped bracket to the channel-shaped member of the housing, a track is formed for slidably engaging the belt during its rotational movement. The belt's contact with the first panel of the L-shaped bracket inserted into the belt's groove forms a tight, continuous seal.

Abstract: An automatic strainer assembly for straining a slurry comprises an inlet for receiving the slurry, a horizontally disposed strainer body in fluid communication with the inlet, and a rotatable strainer member received within the body having an inner surface and an outer surface. One or more scrapers are positioned for removing material from the outer surface of the strainer assembly. A collection vessel is positioned substantially below the body for receiving material scraped from the outer surface of the strainer member. A transport member can be provided for returning the scraped material to the slurry supply for reprocessing thereof. An outlet expels the strained slurry. A manual or automatic washdown system is provided for removing the slurry from the strainer member. A radial bearing assembly and radial seal are associated with the drive shaft of the strainer member to prevent galling. A method for processing a slurry is provided.

Abstract: A device for filtering a stream of water in a channel (2), includes: a wall (6) adapted to be mounted in the channel and including a through-opening, a filter member (10) mounted on the wall opposite the through-opening and including a filter surface projecting relative to the wall, the filter surface having a larger area than would have a flat filter surface fitted in the through-opening, the filter member including retaining members face to face with the filter surface for retaining the bodies that do not pass through the surface, a suction device disposed facing the retaining members, and elements for driving the filter member and/or the suction device in a relative movement of one in relation to the other such that the suction device is successively brought face to face with each retaining member.

Abstract: An automatic strainer assembly for straining a slurry comprises an inlet for receiving the slurry, a horizontally disposed strainer body in fluid communication with the inlet, and a rotatable strainer member received within the body having an inner surface and an outer surface. The strainer member defines a plurality of passageways for strained fluid to pass therethrough. A scraper is positioned substantially adjacent to and contacting the outer surface of the strainer member for removing material from the outer surface of the strainer member. A collection vessel is positioned substantially below the body for receiving material scraped from the outer surface of the strainer member. A helical member is mounted on an internal shaft or auger is located within the strainer member for contacting the slurry to increase mixing and promote flow of the slurry through the system.

Abstract: An automatic strainer assembly for straining a slurry comprises an inlet for receiving the slurry, a horizontally disposed strainer body in fluid communication with the inlet, and a rotatable strainer member received within the body having an inner surface and an outer surface. The strainer member defines a plurality of passageways for strained fluid to pass therethrough. A scraper is positioned substantially adjacent to and contacting the outer surface of the strainer member for removing material from the outer surface of the strainer member. A collection vessel is positioned substantially below the body for receiving material scraped from the outer surface of the strainer member. This collection vessel can include a transport member for returning this scraped material to an initial slurry supply for reprocessing thereof. An outlet is provided in fluid communication with the horizontal strainer body to expel the strained slurry.

Abstract: A self-cleaning screen for shallow water pumping includes a rotatable drum made of mesh material for removing debris from water passing into the drum, and a suction chamber within the drum for feeding water to a suction pipe connected to a centrifugal pump. Inlet openings are arranged across a bottom side of the suction chamber. A check valve assembly is provided to prevent water from back flowing through the inlet openings, to thereby maintain a prime in the suction pipe when the pump is off. The check valve assembly includes valve members that are slidably mounted above the inlet openings for movement between closed and open positions. The valve members move upwardly from their closed positions to their open positions upon movement of water through the inlet openings into the suction chamber, and return to their closed positions by force of gravity when water stops flowing into the suction chamber.

Abstract: A compressible boot seal for sealing the side of a vertical traveling water screen with flights. The boot seal is formed by a U-shaped, bent nylon plate having a bottom base that resides in the boot section at the lower end of the traveling water screen and two upwardly extending arms that are attached at their distal ends to a side of the water screen support. The plate is bent at the intersection of the base and the arms to form a living hinge that allows the plate to deflect toward the side of the support on contact with side edges of the flights. The hinge seals the plate against the side edges of the flights. A resilient filler material fills the void between the plate and the side of the support to prevent sand and debris from interfering with the deflection of the side seal.

Abstract: A self-cleaning screen that automatically cleans both the inside and outside surfaces of the cylindrical screen using only the rotation of the cylindrical screen itself. This self-cleaning ability is accomplished by using a fixed brush on the exterior surface of the screen, and a freely rotating brush on the interior surface of the screen, where the freely rotating brush is driven by the movement of the screen itself.

Abstract: An apparatus serves for removing fine material to be screened from waste water. The apparatus includes a sieve grate (6) and a detaching device (16). The sieve grate (6) is cylindrical, and it is rotatingly driven. The sieve grate (6) allows for waste water to flow from its interior towards its exterior. The sieve grate (6) includes a supporting body (13) and a mesh sieve (7). The supporting body (13) is located at the exterior of the sieve grate (6). The supporting body (13) is made of a perforated sheet metal including comparatively large openings (37). The supporting body (13) provides for resistance and stability of the sieve grate (6). The mesh sieve (7) is located in the interior of the sieve grate (6). The mesh sieve (7) forms a separation surface (14) for the material to be screened. The mesh sieve (7) includes meshes of a comparatively small size. The mesh sieve (7) is fixedly connected to the supporting body (13). The detaching device (16) is arranged outside of the sieve grate (6).

Abstract: A water intake screen with a filter panel includes a frame adapted to be connected to the water intake and a circular filter panel disposed transversely in an opening of the frame, to which it is fastened. The panel includes a wheel extending in a substantially vertical plane between a lower position and an upper position and having radial retaining members on the upstream side of the panel and attached thereto, an aspiration device on the upstream side of the retaining members, and elements for driving the panel and/or aspiration device with a rotary relative movement so as to generate locally through the panel a successive counterflow at each retaining member in accordance with the rotary relative movement in order to take up successively debris and particles retained thereby and to direct them through an evacuation pipe adapted to evacuate the debris and particles to the exterior.

Abstract: An apparatus for removing material from a liquid flowing through a channel includes a sieve grate, a screw conveyor and a detaching device. The sieve grate has an inflow side, an inner side and an outer side. The sieve grate is designed to be cylindrical and to be rotatably driven. The sieve grate is arranged at an inclined orientation to be partially submerged in the liquid. The sieve grate at the inflow side includes an open face. The sieve grate at the inner side includes a plurality of guide plates. The sieve grate includes a shaping carrier element. The sieve grate includes a mesh fabric, the mesh fabric being designed and arranged to form a separation surface for the material. The screw conveyor includes a housing. The screw conveyor includes a driven conveying screw. The screw conveyor is coaxially arranged with respect to the sieve grate.

Abstract: A liquid filtering apparatus for mounting in a housing and positioned to filter liquid flowing from an inlet (23) to a drain. A rotatable wheel is disposed within and coupled to a rotating screen so that rotation of the wheel causes rotation of the screen. The wheel includes vanes (5–12) extending towards the screen dividing the space within the screen into sections substantially isolated from each other except via the drain. A stationary baffle (13) arranged adjacent a portion of the screen prevents liquid from flowing into the wheel through that screen portion. The baffle is positioned such that water flows more readily into sections of the wheel on one side of a vertical plane through the rotation axis than the other sections. Thus, the wheel is unbalanced by water retained in sections of the wheel and rotation of the wheel results.

Abstract: A drive system for driving a screen in a fluid screening system comprises a hydraulic or pneumatic motor coupled to a drive shaft of the screen. The system is sized to provide the torque required to drive the screen throughout-the desired speed range, as well as providing additional torque as required to free lodged solids from the screen field. The hydraulic motor provides overload protection when lodged solids block the rotating rake bar. The drive system operates up to a predetermined pressure value before the overload protection is activated. The drive system may be operated in either a manual mode or an automatic mode.

Abstract: A device for separating debris and other material from rainwater as it flows into a downpipe from a roof gutter is disclosed. The device has a compartment for fitting to the upper end of a downpipe. The compartment has a horizontally pivoted perforated drum which rotates when rainwater and entrained debris from an overhead gutter impinges on it such that the rainwater passes through the perforations in the drum into the associated downpipe and the debris is ejected outside of the device by the rotation of the drum.

Abstract: A liquid filtering apparatus for mounting in a housing defining an inlet and a drain. The liquid filtering apparatus is positioned in use to filter liquid flowing from the inlet (23) to the drain. The apparatus comprises a permeable screen (19) rotatable about a substantially horizontal axis and forming a barrier between the inlet and the drain. A rotatable wheel is disposed within the screen and coupled to the screen so that rotation of the wheel causes rotation of the screen. The wheel is defined by vanes (5-12) extending towards the screen so as to divide a space around which the screen is arranged into sections which are substantially isolated from each other except via the drain. A stationary baffle (13) is arranged adjacent a portion of the screen to prevent liquid from flowing into the wheel through that portion of the screen. The baffle is positioned such that water flows more readily into sections of the wheel on one side of a vertical plane through the rotation axis than the other sections.

Abstract: A system to restrict and remove debris and pollutants from runoff water received from surrounding areas. A receptacle receives the runoff water, and a grate detains the heavier part of its solids burden. A first screen within the receptacle detains solids of lesser size. Water passed by the first screen encounters a tubular second screen in the receptacle which passes water that was additionally screened by it and sends it to a downstream system. A weir at a sensitive level in the receptacle can by-pass the second screen. The second screen is preferably rotatable.

Abstract: The invention relates to a sieving device for mechanically separating and extracting solid bodies or solid matter from a liquid current, in particular, to sieve gratings for process or effluent currents or for use in sewage treatment plants or hydroelectric power stations. Said device comprises a number of sieving panels (2, 2′, 2″) which are substantially arranged in a transverse direction to the direction of flow of the liquid current, are linked together, and which form a revolving endless sieve belt (1) immersing into the liquid current (20). The device also comprises a drive for the endless sieve belt (1), whereby the sieving panels (2, 2′, 2″) are arranged successively in such a way that the revolving motion of the endless sieve belt (1) is comprised within one single plane which lies substantially perpendicular to the direction of flow of the liquid current (20).

Abstract: The invention relates to a machine for micro-filtering solid particles suspended in a liquid stream comprising: a couple of coaxial filtering discs each rotating round its own axis arranged horizontal and normal to direction of the flow to be treated and at least a partially cylindrical wall defining together with the rims of said couple of discs a hydraulic sealing coupling so as to enclose the liquid treating space comprising at least the rotation axis. Each disc of said couples of discs is provided with one or more washing ramps arranged outside said treating chambers and provided with nozzles throwing water against said discs at the portions emerging from the treating chamber. The washing water is collected by at least one liquid conveyance channel feeding the liquid back to the purification plant arranged upstream said machines.

Abstract: A storm-water control header for a culvert has a vertical head-wall with a thimble on the downstream side, and an adjustable inlet control device including a weir on the upstream side. The thimble is positioned within the culvert, and passes water from the weir to the culvert. A low flow section at the inlet control device allows water to pass from the bottom of the device at a low controlled rate to the culvert. A cover on the top of the control device excludes floating matter from the culvert.

Abstract: A self-cleaning intake screen assembly for preventing debris, fish, and other wildlife from being transferred from a waterway such as a lake or river, which includes a conical support structure, a screen and a screen sweeping assembly. The conical support structure has a circular base, a cap plate, and a plurality of support studs extending therebetween. The screen extends between the base and the cap plate and is affixed to the support studs. The screen sweeping assembly is rotatably mounted to the cap plate for sweeping debris off of the screen. A flow restrictor is disposed inside the conical support structure for restricting water flow through a portion of the screen in order to reduce differences in water flow rates through different portions of the screen.

Abstract: A conical intake screen which is self-cleaned by using four elongate brushes which are slowly driven over its surface by a submersible, programmable electric motor. The invention is preferably placed in the waterway with the axis of the conical screen oriented in the vertical direction. As the rearwardly angled brushes move over the screen, the brush angle and gravity tend to force the debris downward until it falls from the edge of the device. Further, a cleaning brush is placed within the surface of the conical screen with its bristles extending slightly above the surface of the screen. In this manner each screen sweeper engages the brush cleaner once each rotation, which action tends to dislodge debris from the bristles of the sweeper brushes. The programmable motor will typically make three counterclockwise revolutions, one clockwise revolution, and then stop for a selectable interval of from 15 minutes to 3 hours, although continuous action is also an option.

Abstract: A device for removing deposited material from a liquid in flume includes a conveyor for the deposited material that is disposed at an ague with respect to the plume and leads to a discarding point. The device includes a housing which houses a shaft and a conveyor screw mounted to the shaft. The shaft includes a hollow portion therein for housing a heater. The heater heats the conveyor for preventing material from freezing in the conveyor.

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: Apparatus for separating waste liquid and solid material comprises an upwardly inclined passage containing an auger for conveying the solid waste material upwardly along the passage, with an inlet opening at a lower end of the passage for receiving a mixture of waste liquid and solid material into the auger, a drainage opening at the lower end of the cylindrical passage for draining liquid from the solid waste conveyed by the auger, and a compactor for receiving the solid material fed upwardly by the auger and compacting the solid waste material. An extruder receives and extrudes the compacted solid waste material from the compactor, and may be arranged to convert the compacted material into pellets.

Abstract: In an apparatus for separating particulate material from a particle-containing liquid, at least the section of the cylindrical housing (10) provided with perforations (5) is designed as a driveable drum sieve (2') so that the solid materials are optimally separated from the liquid phase and are at the same time freed from particulate impurities.

Abstract: A band screen (1) for installation across a channel (2) containing a flowing liquid (6) comprising an endless belt of screening panels (19), each provided with inwardly extending leading and trailing edge walls (26) and so attached to the belt as to be pivotable relative thereto. Cam plates (28) on the sides of the panels (19) slide along inner and outer guide tracks to control the panel orientations around the belt, causing the leading edge walls (26) to form upwardly facing steps on the upgoing side on the screen and to subsequently flatten to facilitate screening.

Abstract: A cylindrical plastic pipe is used as the sidewall of the rotary portion of the strainer. Apertures are drilled radially through the pipe, and one or more screen assemblies are circumferentially wrapped around the outside of and removably fastened to the pipe to cover the apertures. The central core of the strainer contains both supply and suction pipes. The supply pipe feeds cleaning and drive nozzles that are aimed at the pipe apertures. The cleaning nozzles are aimed radially for cleaning certain apertures. The drive nozzles are aimed tangentially toward a circumferential succession of other apertures near the bottom of the pipe to drive the rotary portion. In one embodiment the drive nozzles can rotate the rotary portion in either direction.

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 device for aerobic purification of industrial and/or household waste water, which device comprises a trough-like container for receiving the water for treating, at least two rotatably mounted contactors introduced into the container and having filler elements such as rings arranged loosely therein, feed means for feeding the contaminated water in doses into the container and a sludge collection space for settling the aerobically treated waste water lying behind the container and connected thereto via an overflow, which device is distinguished in that a seal is arranged between the contactors to prevent a direct flow from the one contactor to the other, wherein resistance means are arranged for transporting therebetween of waste water with increased resistance in order to aerobically treat the waste water in each contactor to a sufficient extent.

Abstract: A clamp or clamping member for securing a screen to a support, the clamp having a clamping face adapted to engage the screen and an opposite face, opposite sides and opposite ends. The junction between the clamping face and at least one of the opposite sides forms a curved surface between the clamping face and that side. This curved surface is adapted to engage a screen fixed to the support and the curved surface defines a radius in a plane transverse to the clamping face and the opposite sides. The clamp additionally includes an opening extending therethrough from the opposite surface to the clamping surface, the opening being elongated in the direction between the opposite sides and adapted to allow variable location of a bolt with respect to the clamp for securing the clamping member and the screen to the support.

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: A rotary self-cleaning strainer comprises a circular cylindrical walled pipe on which a circular cylindrical filter screen assembly is journaled for rotation. The pipe has an intake that is surrounded by the filter screen assembly and a discharge that is connected to a pump. When the strainer is placed in a body of water that is to be pumped, water is drawn through the screen that forms the sidewall of the filter screen assembly and enters the intake of the pipe. The filtered water is conducted through the PVC pipe and to the pump. Two sets of nozzles disposed within the filter screen assembly are supplied with return water through a supply line tapped into the pump outlet. The water is forcefully emitted against the screen to both rotate the screen assembly and dislodge adhering debris from the exterior of the screen. Each set of nozzles is 180 degrees from the other so that each acts upon a limited zone of the screen.

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

Abstract: A grating type pipe covering and protector which can be located either within the interior of a pipe or be attached to the outer walls of the pipe at its exit or its entrance openings includes a grating protector employing a two part grating covering having a common support about which both grating portions can pivot onto each other. Both parts of the grating covering have means thereon for affixing the grating to the walls of the culvert pipe.

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 band screen conversion apparatus for filtering water comprising a structural frame and a conventional endless loop of screens mounted for movement in a circuitous path defining two vertical generatrices through which the water may flow in a dual-flow configuration. Extending outwardly and forwardly from each side of the structural frame is a curving, gull wing arcuate baffle having a ledge which engages a vertical guide track defined by the side wall of the foundation. An upstream flow deflector plate extends across the width and height of the band screen apparatus, with a plurality of support struts extending outwardly and rearwardly from the front of the flow deflector plate and connected to the front edges of the arcuate baffles via brackets which are similarly engaged within the guide tracks thus transferring the differential loads directly to the well guide tracks and side walls.

Abstract: A porous, conical structure for submersion in a body of water for rotation by water action. A screw blade in the structure confines as well as propels fish toward an outlet end of the porous structure. A support structure for the porous, conical structure may be embodied in a buoyant platform while a modified form of the collector utilizes a permanent ground supported structure. A receptacle is provided at the outlet end of the porous, conical structure for reception of fish and other collected matter. The receptacle may be a walled structure or the end of a bypass conduit enabling diversion of the collected matter and water away from the body of water. A lift and pivoted bearing permit elevating of porous, conical structure from the body of water.

Abstract: A method and apparatus for uniformly distributing fluid across the entire cross section of a reaction medium and for compensating for volumetric changes in the reaction medium utilized a resilient membrane which cooperates with an adjacent fluid manifold distribution chamber. The combined operation of the manifold distribution chamber with the resilient membrane provides a low resistance to fluid flow in a direction transverse to fluid flow through the reaction medium and a higher resistance to fluid flow across the membrane in the direction of fluid flow through the reaction medium. In this way, fluid is evenly distributed across the cross section of the reaction medium prior to entering the reaction medium and after leaving the reaction medium. The resilient membranes have reserve expansion capabilities, when hydrated, to accommodate expansion in the reaction medium. The resilient membranes are also sufficiently resilient to accommodate expansion of the reaction medium when necessary.

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: The present invention provides a rotary drum filter wherein one or preferably two rotary drum filters are submerged in a tank of liquid to be filtered. Each rotary drum filter is comprised of a generally cylindrical tank having a perforated outer wall plate over which is applied a cloth type filter media. A suction pipe is included inside the rotary drum filter so that filtered liquid can be drawn into the rotary drum filter through the pressure differential established by the suction pipe. Clean filtered liquid exits the suction pipe to the industrial apparatus with which the filter apparatus is used. A backwash vacuum box extending generally the length of the rotary drum filter media is in contact with a portion of the rotary drum filter media. A partial vacuum is established in the vacuum box such that filtered liquid can be drawn outwardly from the rotary drum filter such that solids accumulated on the filter media are drawn off from the filter media thereby cleaning that section of the filter media.

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: Serum is passed through a column containing alkylated silica gel. The column is then washed with a mixture comprising from about 50 to 85 volume percent of an aqueous buffered medium of pH from about 3.5 to 5.0 and from about 15 to 50 volume percent of an organic solvent containing from 1 to 6 carbon atoms and from 1 to 5 heteroatoms selected from the group consisting of oxygen, nitrogen, and sulfur. The tricyclic antidepressant drug is removed from the column with an eluent mixture comprising from about 0 to 75 volume percent of an aqueous buffered medium of pH of about from 6 to 8 and from about 25 to 100 volume percent of one or more organic solvents containing from 1 to 6 carbon atoms and from 1 to 5 heteroatoms selected from the group consisting of oxygen, nitrogen, and sulfur. In this way, a tricyclic antidepressant drug sample, free from interfering metabolites, for use in assay determinations is obtained.

Abstract: A basket frame for a traveling water screen includes a pair of hollow parallel lip beams connected together by end plates which are secured to the lip beams by plugs fixed to the ends of the hollow lip beams. The hollow cores of the lip beams are sealed against ingress of water so that the basket frame is buoyant in water. The lip beams are formed of pultruded fiberglass with cross sectional shapes which are provided with complementary curved surfaces so that the adjacent lip beams on adjacent baskets provide a close fitting seal on the vertical run of the basket train and also on the curved section at the bottom of the basket train where the baskets make the turn around the traction wheel.

Abstract: A traveling water screen is provided with a support frame having a transverse tray for accommodating a conventional screen panel of a specific configuration or alternatively a modified screen panel having an integral pan for positioning over the transverse tray to provide special handling of seasonally varying screened material. A non-abrupt smooth transition at a transition margin between the screen material and the integral pan allows aquatic life forms to flow from the screen into the integral pan when the screen is backwashed without the aquatic material getting lodged between a screen retaining means and the screen.

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: A water screen comprises a revolving screen member, e.g., a band screen or a drum screen, and a washing device. The washing device, comprises a sprayer on one side of the downstream run of the screen member and a recovery channel on the opposite side of the downstream run of the screen member. On the same side as the recovery channel and between it and the sprayer is a mobile trough member. The trough transversely and obliquely from its leading edge adjacent the recovery channel, e.g. a band screen or a drum screen. The leading edge of the trough is maintained continuously in contact with the screen member which may be exclusively by the effect of gravitational force on the trough member.

Abstract: A water intake for example for taking cooling water for industrial installations from a river, a lake or the sea, has a sieve with a filter element and a recovery channel associated with the filter element for collecting and saving elements of the biomass which become stuck to the filter element. Electrodes are associated with the recovery channel 25 and are designed to induce an electrical field, at right angles to the recovery channel in the water to be tapped, so as to compel fish either to swim by themselves in the direction of this recovery channel or to allow themselves to be carried towards the recovery channel by a reverse water current induced at right angles thereto.

Abstract: A rotatable self-cleaning drum shaped filter is partially submerged in a source of water and encloses the inlet of a conduit connected to a ditch pump. A part of the flow of water drawn through the conduit by the ditch pump rotates a water turbine, which turbine is mechanically connected to the drum shaped filter to rotate the drum shaped filter about its longitudinal axis. Simultaneously, a plurality of stationary nozzles forcibly spray a filtering element of the drum shaped filter as the filtering element rotates therepast to remove debris from the filtering element and prevent clogging of the drum shaped filter and water starvation at the inlet to the conduit.

Abstract: An arrangement for treating wastewater containing soluble organic matter through the proliferation of aerobic microorgnisms to purify the wastewater. In an apparatus having a wastewater tank, a water pervious drum rotatably mounted in the tank and partially submerged in wastewater therein, and a multiplicity of biological contactors packed in the drum, the improvement comprising the biological contactors being of hollow structure, each having at least two small openings, a subsidiary biological contactor being provided in the interior of each biological contactor where required, the contactors being compactly packed in the drum so as to be prevented from movement therein.