Abstract: There is disclosed an apparatus for removing solids from water in a canal during or immediately after a rainstorm. The apparatus includes a plurality of filters and a carrier. The filters filter the solids from the water while moving in and taking impact from the water. The carrier carries the filters in a cycle.

Abstract: An insert apparatus for placement in a rain gutter includes a porous insert body including a plurality of randomly arranged filaments attached to one another to form a mat. The insert apparatus is shaped to fit within an inside channel of a rain gutter. Optionally, the apparatus may include a cover panel, comprising a screen, attached to the top of the insert body. Additionally, the apparatus may include a panel provided with holes therethrough, covering the screen panel. In use, the insert apparatus is placed inside of the gutter channel so as to substantially fill part of the channel, blocking entry of debris into the gutter. When placed in the gutter channel, the insert apparatus substantially prevents foreign matter such as leaves, twigs, pine needles, etc, from collecting in the channel. The insert apparatus may be configured to leave an open flow path therebelow when installed in the gutter.

Abstract: A storm water filter system for filtering storm water being fed into an in-ground well includes a housing having an inlet and an outlet, with the outlet being connected to an in-ground recharge well. A plurality of open chambers are formed in the housing. An inlet filter box has an open end located in the housing and positioned with the open end facing the housing inlet. An outlet screen filter is positioned over the outlet for capturing debris from water entering the outlet and has a bypass for water to pass when the filter becomes partially blocked.

Abstract: A filter pit is disclosed. The pit has an inlet and an outlet adjacent a base of the pit. A primary, a secondary and a tertiary filter are located between the inlet and outlet and the tertiary filter is supported above the base and is able to dry out when the flow of water through the pit ceases.

Abstract: There is disclosed a device for removing small solids from water. The device includes an axle and a plurality of rotational filtering units installed on the axle. While rushed and hence rotated by water and small solids, the rotational filtering units filter the small solids. The device consumes little energy other than the water provides.

Abstract: A rain head is disclosed having three filters through which water entering an inlet to the rain head must pass before passing out through an outlet from the rain head. The filters remove successively smaller particles from the water.

Abstract: A hydraulic-permeation type environmental water-runoff filtration-system applicable to street curb-inlet type drainage-chambers, which generally cooperatively interconnect with street and parking-lot drains. The BLUEBAY-BMP™ pollution-trap provides advantage of community-tailored filtering stages, the preferred embodiment seting forth a convenient user-friendly prefabricated-kit assembly employing a basic build-in-place containment-housing which can be readily adapted to the studied needs of a given community,—without incuring alteration of existing sewer-stormdrains.

Abstract: A traveling water screen comprising an endless foraminous belt with flights. The foraminous belt forms a water screen extending from a lower end in a flowing stream to an upper end above the surface of the stream. The stream flows through openings in the foraminous screen. The flights, which may be scoops, are arranged in spaced apart relation on the outer surface of the water screen. The water screen is driven in a direction so that its upstream portion advances upward and its downstream portion downward. The flights form inclined surfaces across the width of the screen from a point of highest elevation to one or more points of lowest elevation at one or both side edges of the screen. As the screen moves, the flights lift fish toward the surface. As a flight breaks the surface, fish slide down the inclined flights toward one or both side edges of the screen to be diverted safely.

Abstract: A chamber having an inlet for receiving polluted storm-water runoff and an outlet for the storm water to flow out. Within the chamber are one or more baffles forming gaps and having apertures. The gaps define a longer water flow route through the chamber and the apertures disperse the storm water within the chamber. This increases storm-water residence time which encourages settling of particulate matter such as sand and grit. In alternative embodiments, there are included a screen, a collection reservoir, and/or a pivotal filter for further dispersing, detaining, and/or filtering the storm water.

Abstract: A chamber having an inlet for receiving polluted storm-water runoff and an outlet for the storm water to flow out. Within the chamber is a screen that is elevated for separating and suspending miscellaneous debris such as vegetative matter, paper, and plastic, and that extends substantially all the way across the chamber to laterally disperse the storm water in the chamber. In alternative embodiments, there are included one or more baffles, a collection reservoir, and/or a pivotal filter for further dispersing, detaining, and/or filtering the storm water.

Abstract: A chamber has an inlet for receiving polluted storm-water runoff and an outlet for the storm water to flow out. Within the chamber is a collection reservoir having an adjustable weir with a skimming edge for skimming off floating matter such as motor oil, other hydrocarbons, and detergents. In alternative embodiments, there are included a screen, one or more baffles, and/or a pivotal filter for further dispersing, detaining, and/or filtering the storm water.

Abstract: A chamber having an inlet for receiving polluted storm-water runoff and an outlet for the storm water to flow out. Within the chamber is a pivotal filter that catches clay during typical storm flows and pivots out of the way during higher flows. In alternative embodiments, there are included a screen, one or more baffles, and/or a collection reservoir for further dispersing, detaining, and/or filtering the storm water.

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: An underwater filtration operator which can be suspended in a river, lake, pond or other water body to filter water from the water body. The underwater filtration operator may be electrically charged to discharge impurities in the water body and increase filtering efficiency and the operator includes a housing having a selected configuration and divided into one or more filtration units, each of which includes a filter medium for filtering water from the water body. A pump is provided in the housing for receiving the filtered water from the filtration units and pumping the filtered water to a collection tank or dispenser or directly to an end user or to a reverse-osmosis water filtration unit for further filtration.

Abstract: A variable vortex, baffle fluid filter apparatus for installation primarily in urban storm water drain sumps. A circular, filter channel that is enclosed on all four sides by filter screens, includes a cylindrical baffle screen that is attached concentrically below the channel for moving impurities to the sump bottom. Provision is made for manually adjusting the velocity of the fluid inlet flow. An angle adjustable, pivotable vane is provided in front of the inlet opening to adjust inlet flow velocity and vortex strength, to keep inlet impurities from sticking to the filter screens. The filter unit provides 150 percent more treatment capacity than comparable filter units and provides easy access for maintenance to all parts.

Abstract: The invention relates to a device, especially a step rake with stationary and movable blades whose movement enables separation materials to be separated and removed from a liquid flowing through said rake. The lower ends of the blades are arranged in the region of the base of the channel or the base of a body of water and are temporarily raised above the base when they move. In order to prevent sediments from being deposited between the movable blades, a pre-mounted cover is provided in the direction of flow. A collector chamber is provided for sediments underneath the cover. A cleaning device is arranged in the collector chamber in order to remove sediments.

Abstract: A wastewater treatment washer compactor system having in-channel motorized screen for installation in an influent channel and removal of screenings from the influent stream; at least one washer and at least one compactor for washing and dewatering the screenings; and system control means for coordinating and controlling the motor speed of the motorized screen, the washing cycle time and processing rate of the washer(s), and the compacting rate of the compactor(s).

Abstract: A barrel type fish and/or particulate screen includes mesh stretched over a supporting cylindrical shell having closed ends. The closed interior opens to a fluid withdrawal conduit, which is connected to an outlet. An inner, substantially conical withdrawal manifold is provided with the base of the substantially conical withdrawal manifold connected to the withdrawal conduit and the manifold extending substantially the axial length of the cylindrical mesh. The substantially conical withdrawal manifold defines uniformly sized and arrayed flow apertures. These flow apertures have the same unit area per unit length of the substantially conical withdrawal conduit. This same unit area per unit length produces within the withdrawal manifold, a substantially constant velocity at all cross-sections of the manifold taken normal the flow along the major axis of the substantially conical shape. Flow velocity distribution through the metal mesh is maintained uniform at all rates of flow through the device.

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: A stepping screen assembly bottom portion is located in a liquid waste stream containing solids. The assembly contains a grid structure containing dynamic and static bars horizontally spaced apart. An outer frame on one side of the grid structure contains a pair of hydraulic cylinders operating rods which move the dynamic grid structure outwardly, upwardly, backwardly and downwardly to cause the solids to be lifted from the liquid waste stream for deposit on a conveyor.

Abstract: A fuel supply apparatus includes a suction filter; a fuel pump which is connected to the suction filter by a connecting pipe through which fuel that has passed through the suction filter is discharged; a fuel passage which protrudes from an upper portion of the fuel pump; and a one-way valve which is provided at an inlet portion of the fuel passage. In the fuel supply apparatus, a high-pressure filter is provided in a fuel passage on a downstream side of the one-way valve, and the suction filter and the high-pressure filter in the fuel passage remove dust in the fuel.

Abstract: A disposable net assembly is provided for a trap for collecting floatable debris in a waterway or combined sewer system. The net assembly includes a knitted bag-shaped mesh net having a frame surrounding the mouth of the net with the net secured around its rim to the frame. The net may be formed of an inner layer and an outer layer of mesh with the openings of the inner layer being substantially larger than the openings of the outer layer. The frame may be formed of a plastic molded material having side members tapered in the vertical direction to facilitate the changing of the netting assemblies and tapered in the downstream direction to lock into place under the force of the flow. Several embodiments of the frame members have projections thereon which cooperate with a clamping element to hold the net to the frame. Some embodiments of the members have parts that lock together with a post and hole construction while others employ a tension band to clamp the net to the projections on the frame.

Abstract: A means separates solid matter from liquid and includes a perforated separation panel through which the liquid can pass and which prevents the passage of the solid matter of a size larger than a predetermined size. When solid matter becomes located against the panel, the flow of liquid along the face of the panel on which the solid matter is located will tend to cause the solid matter to move from the panel so that the panel is self cleaned and does not become obstructed by the solid matter.

Abstract: A wastewater treatment apparatus comprised of a water inlet 10, a filter component comprised of a series of filters 20, 30, 40 and settling ing areas 12, 22, 32 over a grade, and a series of separator tanks, 42, 52 connected by a lift tube 54 for removal of hydrocarbons, particulate material and other impurities and a water outlet for discharge into either a general wastewater system or a gray water reclamation system.

Abstract: An ion removal arrangement includes a filter having a filter material made of synthetic or naturally occurring crystalline hydrated aluminum silicates having a framework structure, which contain alkaline or alkaline earth ions. The filter is formed as a double pipe cartridge having an inner pipe and an outer pipe. The filter material is filled in the annular space between the inner pipe and the outer pipe. The filter is installed in the cast iron gutter pipe of a gutter system.

Abstract: A dewatering system for separating a stream of liquid from the items traveling therein. The dewatering system includes a primary grid which catches the stream of liquid from a flume or other device. The liquid stream, but not the solid items, passes through the primary grid and is caught by a baffle which smoothly redirects the liquid. The baffle is arranged with respect to the primary grid so that the surface of the stream flow through the grid is substantially tangential to a leading portion of the baffle.

Abstract: An apparatus and method for recycling drilling mud contaminated with particulates, consists of channelling a stream of contaminated slurry onto a screen deck, with the partly cleansed liquid entering a mixing tank. Liquid within the tank is continually mixed. An exit conduit removes liquid from the tank on a continuous basis, where it is given an additional purification with a cyclonic separator. The heavier fraction is further screened, with the resulting purified liquid re-entering the tank. The lighter fraction exists the cyclonic separator, and a portion of the lighter liquid is withdrawn for use as a substantially cleansed liquid. Another portion of the lighter fraction is re-circulated back into the tank, thus providing multi passes through the system to provide enhanced purification. The cleansed liquid may be directed into a separate mixing apparatus, in which additional slurry-forming powder such as Bentonite is added for forming a new slurry.

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 fish diversion apparatus for a water intake of a dam includes a frame extending between a top end oriented towards the water surface and a bottom end oriented below the water surface. The frame supports a number of bar screen panels below the water surface. The bar screen panels allow water flow therethrough from an upstream side to a downstream side. A flow scoop extends from the bottom end of the frame to direct the fish along the upstream face of the bar screen panels. A fish diverter device is provided adjacent the top end of the frame in communication with the upstream side of the bar screen panels.

Abstract: A gross pollutant trap (50) to be installed in a storm water channel so as to receive storm water flowing through the channel and to filer gross pollutants from the storm water. The trap (50) includes a gross pollutant collection area (61) toward which there extends generally parallel sets (63) and (67) of vanes (64) and (68). The area (61) is at least partly defined by a mesh wall (72) through which water returns to the storm water channel.

Abstract: An in-line storm water drain filter and baffle box is installed within a storm water drain pipe to direct storm water runoff through the storm water drain pipe and through the filter and baffle box prior to the storm water drain water passing through an outfall into a lake, pond or retention area. The filter system includes a housing having an inlet and an outlet and a plurality of chambers formed therein. A housing cover allows for access into the housing and a plurality of filter screens are mounted over each of the plurality of housing chambers for collecting trash from the storm water passing therethrough. The housing has a generally arcuate bottom. The filter system also has inlet and outlet cover frames for holding removably mounted blocker dampers for blocking the ingress and egress of storm drain water during cleaning of the filter system. An oil collection boom is removably mounted in the housing adjacent the inlet for collecting oil in the drain water entering the housing inlet.

Abstract: A rainwater filter assembly (1) comprises a housing provided with an inlet (9) and an outlet (3), the inlet is adapted to receive rainwater discharging from a downpipe (10), and in use the assembly (1) is located in series with an underground pipework (27), the housing defines a silt collection chamber (7) in which silt can settle from water passing from the inlet to the outlet, the entrance (23) to the outlet from the silt collection chamber being located above the base of the silt collection chamber, and the housing containing or supporting at least one filter (9) adapted to filter coarser material than silt from the rainwater. Advantageously the filter assembly is capable of filtering coarse material from the water and provides a silt collection chamber so as to reduce the quantity of particulate material that passes to the pipework in the ground and to the soakaway normally connected to such pipework.

Abstract: A catch basin curb inlet filter assembly for preventing debris from being swept into the catch basin by rainwater. The filter assembly has first and second outer filters, an inner filter located between said first and second outer filters adjacent the lower longitudinal edges thereof, and a rigid rib member located between the first and second outer filters. The first and second outer filters have identical configurations. Each of the first and second outer filters may be provided with an overflow passageway adjacent the mid-portion of the top edges thereof. The first and second outer filters, inner filter, and rigid rib member are attached together to form the filter assembly. At least two strap openings extend through the filter assembly to permit a flexible or rigid strap to pass therethrough for attaching the assembly to the curb grate of a catch basin.

Abstract: A pollution control device (10) for removal of litter and sediments from a flowing stream of stormwater or the like, the device including an upwardly inclined flume (11,18) adapted to be disposed adjacent the discharge end of a stormwater outlet (16) with a collection container (12) at the opposite end of the flume, the flume (18) and the container (12) being fabricated from expanded metal mesh screen. During stormwater flow, litter entrained with the stormwater is urged up the inclined path of the flume (18) for collection in the container (12) whereas sediments are screened from the flume (18) and the container (12) through apertures in the expanded metal screen and pass through to a sediment sump (29) disposed beneath the device (10). Stormwater which has been so screened is then permitted to flow further downstream. A method of separating litter and sediments from a flowing stream of stormwater is also claimed.

Abstract: A sediment filtering apparatus and a method for removing sediment from a waterway. One or more collector assemblies are secured to a river bottom and have a leading, ramp surface facing upstream and over which the water flows. As the water/sediment mixture passes the apex of the collector, the trailing edge drops off rapidly thereby reducing the stream velocity and allowing the sediment to settle from the flow. The sediment then collects on the downstream side of the collector and via one or more openings reaches an internal cavity. A suction pipe is placed under negative pressure and draws the water/sediment mixture to a filtering apparatus which then returns filtered water to the waterway. The sediment and debris filtered therefrom is then easily removed.

Abstract: An in-line storm water drain filter and baffle box is installed within a storm water drain pipe to direct storm water runoff through the storm water drain pipe and through the filter and baffle box prior to the storm water drain water passing through an outfall into a lake, pond or retention area. The filter system includes a housing having an inlet and an outlet and a plurality of chambers formed therein. A housing cover allows for access into the housing and a plurality of filter screens are mounted over each of the plurality of housing chambers for collecting trash from the storm water passing therethrough. The housing has a generally arcuate bottom. The filter system also has inlet and outlet cover frames for holding removably mounted blocker dampers for blocking the ingress and egress of storm drain water during cleaning of the filter system. An oil collection boom is removably mounted in the housing adjacent the inlet for collecting oil in the drain water entering the housing inlet.

Abstract: A growth pollutant trap (50) to be installed in a storm water channel so as to receive storm water flowing through the channel and to filter growth pollutants from the storm water. The trap (50) includes a growth pollutant collection area (61) toward which there extends generally parallel sets (63) and (67) of veins (64) and (68). The area (61) is at least partly defined by a mesh wall (72) through which water returns to the storm water channel.

Abstract: A mechanically cleanable screen for separating liquid from chips and pulp without the screen getting blocked, particularly in the process area where cooking and circulation liquids are removed from a pressure vessel during the production of chemical pulp and paper pulp by a continuous method. The screen has two screens: a primary screen and a secondary screen which are attached to a common body one after another in the direction of the liquid to be filtered so that they form a cassette. The blades of the secondary screen generate shear and push forces that clean the slots of the primary screen.

Abstract: A sewage screening apparatus which receives, in use, a sewage flow comprising a screen arrangement having a continuous belt screen for capturing screenings contained within the sewage flow to enable their subsequent removal therefrom. The apparatus also includes an impeller for generating a turbulence effect within the sewage flow to effect washing of the screenings contained within the sewage flow prior to their removal therefrom. The impeller is located within the screen arrangement.

Abstract: The invention relates to a filtering apparatus for removing matter and bodies accompanying a liquid flow. The filtering apparatus includes a number of individual filter elements disposed to be displaced in an endless path. The endless path is formed by one or more arcs in relation to which the filter elements are displaceable. A drive is provided for displacing one filter element at a time past a scraper device for removal of matter accumulated against the filter element.

Abstract: A staged filter apparatus (1) for mechanically separating solids from liquids flowing in channels, gutters or conduits, which has a multiplicity of stage screen bars (7′) connected to form a stationary grating (7), and a multiplicity of stage screen bars (6′) connected to form a movable grating (6), the gratings (6, 7) being arranged inclined in the direction of flow inside the flowing liquid starting from a level situated below the surface, and the stage screen bars (6′, 7′) being constructed in a stepped fashion in the direction facing the incoming flow, and in which the movable grating (6) can be actuated by means of a drive device (8) on a track. The stationary grating (7) being surrounded at least laterally by frame parts (3, 4), is distinguished in that all the drive elements (11, 12, 19; 13) of the movable grating (6) are essentially arranged in the common plane formed by the stationary grating (7) and the movable grating (6) in the zero position.

Abstract: A stormwater pollution separator and filter apparatus to be fitted inline in a stormwater conduit. The apparatus has an inlet (1) receiving stormwater and leading through an inlet aperture (3) to a separation chamber (4) which then leads to a filtration chamber (5) which is positioned below the inlet aperture (3). A riser (6) leads from the filtration chamber (5) to an outlet (7) which is connected back to the stormwater conduit (3). The inlet opening is connected tangentially into the separation chamber (4) to create, in use, a swirl action in the separation chamber (4) by reason of the flow of the stormwater. The separation chamber (4) is positioned vertically above the filtration chamber (5), and the filtration chamber (5) has one or more filtration baskets (9) positioned in the filtration chamber (5) to receive substantially all the flow of stormwater from the separation chamber (4), the baskets (9) are spaced apart from a wall (10) defining a periphery of the filtration chamber (5).

Abstract: An apparatus for collecting and removing solid particles from a flowing fluid (5) includes a grid unit (6) including a plurality of stationary bars (1) being arranged to form a stationary bar unit (3), each of the stationary bars (1) including a plurality of steps (8) and including a skeleton portion (9) and a rising portion (10). A plurality of movable bars (2) is arranged to form a movable bar unit (4), each of the movable bars (2) including a plurality of steps (8) and including a skeleton portion (9) and a rising portion (10). The stationary bars (1) and the movable bars (2) are arranged side by side to alternate. The steps (8) include an undercut (11, 13). A drive (25) moves the movable bar unit (3) along a closed path of movement (21) being substantially elliptical.

Abstract: A fluid treating apparatus includes a primary conduit defining a flow path for the fluid being treated. A column is connected to the pipe forming an inlet into the flow path. A reaction container having a perforated side wall enclosing a treating agent is positioned in the inlet and in the flow path. In preferred embodiments, the method and apparatus is for dechlorinating water prior to discharge. One or more aerators can also be mounted in the pipe to aerate water passing through the conduit upstream and/or downstream of the reaction container.

Abstract: A drainwater treatment system positionable within a horizontal flow passage of a drainage system utilizes a partition which divides the flow passage into an upstream chamber and a downstream chamber. In addition, a mid-panel is supported within the upstream chamber for dividing the interior of the upstream chamber into an upper section and a lower section so that the drainwater enters the upper section before entering the lower section through a first opening provided in the mid-panel. A conduit is also joined between a second opening provided in the mid-panel and the opening of the partition for conducting drainwater from the lower section of the upstream chamber to the downstream chamber so that the drainwater which enters the upper section and then into the lower section is decelerated to flow conditions at which debris and suspended are permitted to separate and settle from the drainwater before being conducted from the lower section and into the downstream chamber through the conduit.

Abstract: A basket for a traveling water screen which includes a top rail with a pair of spaced apart end members at opposite ends of the top rail which are joined to the top rail. A water screen extends between the end members and includes an upper edge portion supported by the top rail, and a lower edge portion opposite the upper edge portion, and opposite edges supported by the spaced apart end members. A lower channel rail extends between the spaced apart end members and supports the lower edge portion of the water screen with the lower channel rail defining an internal channel having a smooth arcuate inner surface. An insert in the form of an elongated member is positioned in the bottom, back downstream side of the channel and forms a quiescent condition in the bottom of said channel when the basket is exposed to a flowing water stream.

Abstract: A stepping screen assembly bottom portion is located in a liquid waste stream containing solids. The assembly contains a grid structure surrounded by an outer frame. The grid structure includes multiple parallel alternate static and dynamic bars horizontally spaced apart by spacers attached to the sides of the dynamic bars. Each bar has multiple vertically spaced apart shelves at a right angle to the vertical axis of the bar. The outer frame on each side of the grid structure contains a single and double stroke pneumatic cylinder connected to the dynamic bars. The single stroke cylinder causes the dynamic bars to move in a vertical plane and the double stroke pneumatic cylinder causes the dynamic bars to move in a horizontal plane.

Abstract: An apparatus for collecting and removing solid particles from a flowing fluid (5) includes a grid unit (6) including a plurality of stationary bars (1) being arranged to form a stationary bar unit (3). Each of the stationary bars (1) includes a plurality of steps (8). A plurality of movable bars (2) is arranged to form a movable bar unit (4). Each of the movable bars (2) includes a plurality of steps (8). The stationary bars (1) and the movable bars (2) are arranged side by side to alternate. A first parallelogram unit (11, 12, 13, 14, 17) is connected to stationary bearings (11, 12) to be pivotable in a plane about the pivot axes of the stationary bearings (11, 12) with respect to the stationary first bar unit (3). A second parallelogram unit (15, 16, 18, 19, 20, 21) is operatively connected to the first parallelogram unit and to the movable second bar unit (4).

Abstract: A filter apparatus (10) having an upstream first filter grate (17) to which stormwater is delivered so that litter is filtered therefrom. Litter is delivered to a first litter collection surface (20). Extending upwardly from the surface (20) is a filter wall (22) having a filter portion (31) through which the stormwater again passes to filter litter therefrom. A second filter grate (24) extends from an upper portion of the wall (22), the second grate (24) leading to a second litter collection surface (26).

Abstract: An apparatus for separating bodies from a flowing liquid in which the apparatus includes a rotary conveyor helix (3) which is disposed at an angle with the horizontal and has a lower portion (10) which forms a screening device (40) and an upper portion where discharge takes place of material which has been displaced by the conveyor helix (3) from the screening device to the upper portion. At least one extra screening device (70) is disposed adjacent to the first screening device (40) for lateral transport to the first screening device of material which has been entrapped by the extra screening device.