Abstract: An apparatus for use in a sewage treatment plant comprises a settlement tank, an inlet channel for delivering an input sewage flow to the settlement tank, and a screen arrangement having a continuous belt screen for capturing screenings contained within the sewage flow to enable their subsequent removal therefrom. The screen arrangement is arranged within the settlement tank.

Abstract: A second purifying apparatus 2 for furthermore purifying working solution purified by a first purifying apparatus 1 is disposed downstream of the first purifying apparatus 1. A working-solution introducing pipe 42 which is capable of diffusing and discharging the working solution from the lower end thereof is disposed in substantially the central portion of the working-solution accumulating tank 40 in which the working solution is accumulated. A filter 44 for vertically sectioning the working-solution accumulating tank 40 at an intermediate position is provided. A weir 45 is formed at an upper end of the working-solution accumulating tank 40. Moreover, a separating wall is formed along the inner wall of the weir 45. A solution gathering groove 47 is provided for the outer surface of the weir 45.

Abstract: A skimmer for operating in a water environment provides a conveyor with transverse apertures and a sloping upwardly travelling lower flight in a trough shaped guide, for a lower extent and, over an upper extent beyond said guide and designed to move material in said upper extent and there to detach material in said apertures.

Abstract: A wear shoe for mounting to a flight of a sludge collector. The wear shoe snaps into a surface of the flight at a desired location and is held in place with no additional fasteners or hardware. The wear shoe is able to be utilized with any channel-type flight configuration.

Abstract: A waste water treatment system for removing sludge from within a rectangular clarifying tank having a plurality of sludge collector flights attached to a pair of parallel chains for collecting sludge and scum within the waste water. Each of the collector flights includes a non-metallic elongated main body portion having spaced top and bottom walls connected by spaced front and rear walls for defining a hollow, interior cavity. Buoyant foam material is disposed within the interior cavity for increasing the buoyancy of the collector flight. The waste water treatment system further includes plastic bull and drive sprockets mounted to a drive shaft running across the width of the tank, and a chain drive assembly for driving a pair of parallel drive chains attached to the drive sprockets. The drive assembly causes rotation of a drive shaft through a chain link attachment to the bull sprocket.

Abstract: A scum sweeper for sweeping surface floating matters in a clarifying tank to a collector channel. A sweeping blade is pivotally hanged by arms to parallel endless running chains mounted onto a supporting frame installed in the tank at an above position with respect to the collector channel. A motor drives the chains that haul the blade back and forth successively over and at the surface of water in the tank. The blade always remains under the chains as a result of a free pivoting of the arms at the opposite turning end courses of the chains. Guiding arrangements are provided to lock the arms in a downward direction when the sweeping blade travels horizontally.

Abstract: Scraper bar arrangement to be used particularly in connection with a liquid handling reservoir, such as a clarification basin or like, which comprises one or several scraper bars (1) being placed one after another in the longitudinal direction (5), transfering means (2) for moving of the scraper bar/bars (1), such as two transmission chains (2b) or like being placed side by side and being driven by means of a drive wheel and turning wheel arrangement (2a) or accordingly, in connection with which the scraper bar/bars (1) is/are attached by means of an attachment arrangement (3), preferably removably, such as by a screw joint or like. The scraper bar (1) is formed known as such of at least two first bar parts (1a), that are fixed to the transfering means (2), such as to two transmission chains (2b) placed side by side, and of at least one second bar part (1b), that has been attached between the above by means of coupling means (4), that operate preferably by quicklocking principle, and locking means (5).

Abstract: A cover apparatus for inhibiting the growth of algae on the fluid-contacting surfaces of an inboard launder channel disposed to receive a water flow from a central and from a peripheral region of a water treatment tank and for capturing noxious gases. Cover supports coupled to the sidewalls of the launder channel position the covers above the inboard launder channel and hinge means permit the covers to be pivoted away and toward the launder channel, for accessing the channel. In one embodiment, the inboard launder channel is circular and the covers are disposed above it with a substantially similar radial curvature. In another embodiment, the inboard launder channel is made up of straight sections angled at the end of each section to form a polygon, with fixed cover corner sections disposed in between adjacent straight sections. In still another embodiment, several straight inboard launder channels are parallel to each each other and each empty into a main channel.

Abstract: In floating substance removing, collecting and treating method and apparatus capable of securely separating and collecting floating substances floating on a water surface without adversely affecting an ecological system regardless of the type and state of the floating substances, a permeable sheet 4 is successively or intermittently moved through a drive unit 5 so as to traverse the treating water P taken from an intake port 3 and at the same time the treating water P is forcibly moved relatively to the permeable sheet 4. Accordingly, floating substances F on the water surface can be effectively collected by being deposited on and separated from the permeable sheet 4, whereby filtered clean water can be obtained.

Abstract: Disclosed is a separator that extracts solids from a manure slurry. The separator includes a powered rotating drive cylinder, a plurality of fins radially extending from the drive cylinder, and a flexible conveyor belt driven by the drive cylinder. The conveyor belt has a plurality of grooves positioned so that at least one of the fins contacts a substantial portion of one of the grooves as the drive cylinder drives the flexible conveyor belt.

Abstract: A collector flight for use in a sewage settling or sedimentation tank includes an elongated, generally C-shaped, one-piece, extruded aluminum body defined by top and bottom, hollow, rectangular heads connected together at one corner by a planar web. Slots extend the length of each side of the heads to receive brackets used to connect the flight to chains which move the flights through a sedimentation tank. The slots are also used to mount accessories such as shoes and a combination wiper/skimmer strip on the flights.

Abstract: A method and a basin serve the purpose of sedimenting sludge in waste water, which in a flow is supplied to the basin via an inlet and in clarified condition is removed via an outlet placed opposite to the inlet. In the inlet there has been built in resistances of flow which create a heavy turbulence in the water flowing and transform a substantial part of the energy of flow from the water into energy in the whirls which create the turbulence. Thereby there are created flow conditions which increase the creation of sludge flocs and the succeeding sedimentation of these.

Abstract: A filtering apparatus and filtering system where a hinge belt 10 of a hinge-belt type filtering apparatus 100 is continuously rotated by driving of a drive motor 65 such that hinge scrapers are rotated along a bottom plate 6b of the hinge filtering apparatus main body, from a horizontal part to a slope part of the hinge filtering apparatus main body.

Abstract: In accordance with the teachings of the present invention, a waste water treatment system for removing sludge from within a rectangular clarifying tank as provided. The waste water treatment system includes a plurality of sludge collector flights attached to a pair of parallel chains for collecting sludge and scum within the waste water. Each of the collector flights includes a non-metallic elongated main body portion having spaced top and bottom walls connected by spaced front and rear walls for defining a hollow, interior cavity. Buoyant foam material is disposed within the interior cavity for increasing the buoyancy of the collector flight. The waste water treatment system further includes integrated plastic bull and drive sprockets and a chain drive assembly for driving a pair of parallel drive chains attached to the integrated plastic bull and drive sprockets. The chain drive assembly includes dual drive shafts exterior to the waste water with each extending across half the width of the tank.

Abstract: A drive system for a filtration apparatus includes a housing, a motor, an input gear driven by the motor, a ring gear, an eccentric gear assembly, an internal gear assembly, and an output gear. The ring gear is driven by the input gear about a central axis. The eccentric gear assembly includes an eccentric plate rotatable about the central axis, concentric rollers, and eccentric rollers. The eccentric plate is fastened to the ring gear to rotate therewith. The concentric rollers are interposed between the eccentric plate and the housing to enable rotation therebetween. The eccentric plate is eccentrically movable about the central axis within a bore of the housing. The internal gear assembly has an eccentric plate rotatable about the central axis and circular bores extending through the eccentric plate.

Abstract: A rectangular clarifying tank has an inclined beach formed of sheet metal and having 575 holes per square inch, each hole having a diameter of 20 thousandths of an inch. Two side chain drives advance several scrapers along the beach. Each scraper has a rotatable knurled pipe which turns the sludge and aids dewatering through the beach. The sludge removed from the clarifier has a solids content of between eight and twelve percent. Additional dewatering may be accomplished by applying a vacuum to the last one-quarter of the beach. A tray positioned beneath the beach collects water which drains through the beach. The drain water may be returned to the clarifier tank or may be directly treated as clarified water.

Abstract: The present invention includes a compact drive system comprising a housing, a motor, a worm screw, a first gear, an internal gear, a second gear and an output gear. The motor is supported relative to the housing and the worm screw is driven by the motor. The first gear rotates about a central axis and is driven by the worm screw to provide a first gear reduction. The first gear has a hub offset from the central axis. The internal gear mounts relative to the housing and has a predetermined number of internal teeth. The second gear has an aperture which is driven by the eccentric hub as the eccentric hub rotates. The internal teeth cooperate with the external teeth so that the second gear orbits within the internal gear when driven by the eccentric hub to provide a second gear reduction. An output gear rotates about the central axis and is supported relative to the housing.

Abstract: A belt type oil and grease skimmer for removing hydrocarbon contaminants from surfaces of bodies of water is disclosed. The skimmer includes a housing and frame structure for positioning above a contaminated body of water. An idler roll and a coating nip roll pair are rotatively mounted on the structure for rotation about generally horizontal axes when the skimmer is in use. An endless belt is trained over the idler roll and between the nip rolls and is suspended in a contaminated body of water when the skimmer is in use. A pair of wipers are positioned on opposite sides of the belt at a wiping location between the idler roll and the nip rolls for removing belt adhered hydrocarbons. A receptacle is positioned to receive wiper removed hydrocarbons. The receptacle includes a heat chamber and a heat transfer wall for transferring heat from the chamber to heat collected hydrocarbons. The wipers skew the belt to cause the formation of a containment draining depression upstream from the wipers.

Abstract: A method and an apparatus for the purification and treatment of liquids which are used for cooling and/or lubricating and contain impurities of metal and other materials, particularly for separating scale from the process water of cooling cycles in the metallurgical industry, wherein the liquid to be purified flows through intermediate spaces between plates arranged parallel next to each other in a container, and wherein the plates are arranged horizontally and are moved upwardly and/or downwardly transversely of the flow direction of the liquid. The solid particles are removed from the process water by sedimentation on the plates and additionally by a magnetic force which emanates from the upper sides of the plates.

Abstract: A continuous-belt drilling mud separation unit is removably mounted in a box-like housing disposed in the flow path of drilling mud or drilling fluids and is operated by a motor on the housing. The separation unit includes a generally rectangular frame, a tensioning system, and a wide continuous belt in the form of a mesh screen, chain, self-cleaning chain link belt, or combination chain link belt and wire mesh screen which extends around rollers or sprockets and is driven in a continuous loop moving along the longitudinal axis of the frame. As drilling mud or drilling fluids are conducted onto the moving belt, liquids and particles smaller than the openings in the belt pass through the openings and liquids and particles larger than the openings are transported on the moving belt and are discharged off of one end as the belt completes its path.

Abstract: A wet flue gas desulfurization process wherein sulfur dioxide present in flue gas is absorbed into a slurry containing a calcium compound, the slurry having sulfur dioxide absorbed therein is oxidized to form a gypsum slurry, and gypsum is separated and recovered from the gypsum slurry, which comprises the steps of dipping a part of a circulating filtering surface of a suction filter into the gypsum slurry so as to cause gypsum to adhere the filtering surface, carrying the gypsum-bearing filtering surface above the surface of the gypsum slurry, sucking out the liquid phase through the filtering surface to form a dehydrated gypsum layer thereon, and removing the gypsum layer from the filtering surface, as well as an apparatus for carrying out this process.

Abstract: There is provided an a wear strip assembly for use in a waste water treatment facility comprising an anchor plate secured to the bottom of a tank and a wear strip disposed around the anchor plate having a c-shaped cross section. The wear strip may be slid onto the anchor plate. There is also provided a waste water treatment system employing the wear strip assembly. There is further provided a stop plate for use in the wear strip assembly.

Abstract: Method and apparatus are provided for separating coarse and ultrafine solids from a liquid stream to produce a substantially dry solids discharge and a clarified liquid. Apparatus is provided comprising a combination of a settling tank, a plurality of filter screens spaced along an endless link-chain conveyor, a screen vibrator and directed air streams. In operation, coarse solids settle preferentially to the tank bottom. Ultrafines solids remain in suspension. Relatively coarse filter screens are conveyed from a point outside the tank to traverse a prolonged path through the liquid. Ultrafine solids are captured on the screens, by filtering the liquid through an ever finer build-up of filter cake. The relatively large number of passes of the screens through the liquid provides effective filtering of suspended solids. Further, the screens dredge settled solids from the tank bottom.

Abstract: In accordance with the teachings of the present invention, a waste water treatment system for removing sludge from within a rectangular clarifying tank as provided. The waste water treatment system includes a plurality of sludge collector flights attached to a pair of parallel chains for collecting sludge and scum within the waste water. Each of the collector flights includes a non-metallic elongated main body portion having spaced top and bottom walls connected by spaced front and rear walls for defining a hollow, interior cavity. Buoyant foam material is disposed within the interior cavity for increasing the buoyancy of the collector flight. The waste water treatment system further includes integrated plastic bull and drive sprockets and a chain drive assembly for driving a pair of parallel drive chains attached to the integrated plastic bull and drive sprockets. The chain drive assembly includes dual drive shafts exterior to the waste water with each extending across half the width of the tank.

Abstract: Apparatus for cleaning fluids, especially cooling lubricants of machine tools. The apparatus includes a tank having a partition subdividing it into a sedimentation chamber and a clean chamber and having an inlet for the contaminated cooling lubricant and a discharge device for the cleaned cooling lubricant. A filter is mounted between the sedimentation chamber and the clean chamber and a conveyor device is mounted in the sedimentation chamber for removing sedimented particles from the tank. An environmentally safe and low-maintenance cleaning apparatus according to this invention is created by the fact that the sedimentation chamber is subdivided by a partition into an inlet area and a preliminary cleaning area that are connected to each other by a passage in the lower area of the partition. The filter is an edge filter mounted in the partition between the preliminary cleaning area and the clean chamber.

Abstract: A belt type oil and grease skimmer for removing hydrocarbon contaminants from surfaces of bodies of water is disclosed. The skimmer includes a housing and frame structure for positioning above a contaminated body of water. An idler roll and a coating nip roll pair are rotatively mounted on the structure for rotation about generally horizontal axes when the skimmer is in use. An endless belt is trained over the idler roll and between the nip rolls and is suspended in a contaminated body of water when the skimmer is in use. A pair of wipers are positioned on opposite sides of the belt at a wiping location between the idler roll and the nip rolls for removing belt adhered hydrocarbons. A receptacle is positioned to receive wiper removed hydrocarbons. The receptacle includes a heat chamber and a heat transfer wall for transferring heat from the chamber to heat collected hydrocarbons. The wipers skew the belt to cause the formation of a containment draining depression upstream from the wipers.

Abstract: An apparatus for recovering oil-based liquid from a body of liquid including a first layer of the oil-based liquid and a second layer of a second liquid having an interface with the first layer is disclosed. The apparatus includes an endless loop of oil-based liquid absorbent material extending downward a vertical distance into the first layer for absorbing the oil-based liquid therefrom and a drive conveying the absorbent material in a substantially vertical path from the first layer. The apparatus also includes a guide submerged in the body of liquid directing the absorbent material through the first layer. The guide has a buoyancy selected to maintain the absorbent material in the first layer by varying the vertical distance in response to a variation in the level of the interface.

Abstract: There is provided an a wear strip assembly for use in a waste water treatment facility comprising an anchor plate secured to the bottom of a tank and a wear strip disposed around the anchor plate having a c-shaped cross section. The wear strip may be slid onto the anchor plate. There is also provided a waste water treatment system employing the wear strip assembly.

Abstract: A fractional filtration apparatus, used for obtaining cutting oils fractionally cleaned by using one filtration apparatus so as to reuse the separated cutting oils in accordance with the types of machining operations, includes a plurality of liquid tanks for fractionally storing the cleaned cutting oils, a filtration target cutting oil storage tank for temporarily storing a filtration target cutting oil charged through a charge port, rotatably driven filtration drums, dividing the liquid level of the cutting oil and being pivotal in the filtration target cutting oil storage tank, each drum having a side-surface opening in at least one surface thereof in order to let a filtered cleaned cutting oil flow into the cutting oil tanks, and each drum being provided with filters of different mesh sizes, injection nozzles for reversely washing the filters provided on the outer circumferential surfaces of the filtration drums, and dip-up members, disposed at a predetermined intervals, for continuously conveying the cutt

Abstract: A method for assembling an apparatus that removes solid waste material from a stream of water. The apparatus sits in a channel within which the water containing waste material flows. A plurality of vertically oriented, laterally spaced apart, rotating screens are driven by sprocket segments and provide a filtering function. The screens are formed by plural loops of articulated links. Each link includes a horizontally-extending part that lifts solid matter from the stream as the screens rotate. The assembly method includes placing the links on shafts in a predetermined pattern that creates a frusto-conical space bordered by links. The frusto-conical space provides ample clearance space for each sprocket segment and ensures that the sprocket segments will not rub against the links which in turn prevents the parts of the apparatus from becoming misaligned with respect to one another so that the apparatus may operate for extended periods of time without requiring adjustment.

Abstract: A chain and flight mechanism for use in a clarifier tank or other fluid treatment tank includes a skimmer mechanism having a three dimensional configuration and an interior space for collecting floating debris and scum which floats on the water in the tank. The skimmer mechanism is attached to the flight of the chain and flight mechanism by hinge means which allows the skimmer mechanism to move relative to the flight. The fluid treatment tank further includes a self-adjustable scum trough which is capable of moving up and down in the tank responsive to varying water levels.

Abstract: A sludge collector mechanism for scraping settled sludge off the bottom of a settling tank is disclosed wherein a sludge collector flight comprises a high strength "H"-shaped cross section and inwardly projecting lips for engaging the outwardly projecting clips of a wear shoe to thereby secure the wear shoe to the sludge collector flight.

Abstract: A wash system using a biodegradable chemical in a water solution for the degreasing of items such as automobile parts, machine parts or medical parts. The fluid is recirculated, can be heated, is filtered and any oils or greases lighter than water are separated and reclaimed from the top of the solution. The solution is held in a reservoir tank pumped through a filter and a goose neck pipe to a nozzle in the sink. The oils or greases are removed by a skimming system into flexible tubing which empties into buckets for later recycling. The filter removes particles, metal filings and is recycled as scrap metal.

Abstract: In a sludge collector mechanism having a sludge flight for scraping settled sludge off the bottom of a settling tank and skimming floating waste from the surface of the water contained in the tank, a support rail assembly for maintaining the flight on a level generally even with the surface of the water, the support rail assembly comprising a non-metallic longitudinal track on which the end of the flight is slideably supported and at least one non-metallic mounting bracket for securing the track relative to the sidewall of the settling tank. The track comprises a cross section having a substantially horizontal rail portion, a transverse stem extending downward from the underside of the rail portion, and two opposing fingers, one extending upward from the bottom of the stem and one extending downward from the underside of the rail portion.

Abstract: A novel waste water clarifier system for use in long settling basins utilizes a novel high strength-to-low mass ratio chain loop system of non-metallic material in a low friction drive and support system in which roller contact is facilitated at all points of wear. The chain links are formed of multiple layers of fiber reinforced resin tapes laminated together within a desired cross-sectional area and incorporating interior bushings for link interconnections into a chain loop. All rotary and linear wear mechanisms are low friction, rolling contact devices, incorporated in or arranged with the necessary flights and shafts. Both long life and protection against equipment malfunction are enhanced by the low mass, low drag components together with the high safety margins in the chain loops.

Abstract: A scum removal apparatus operable in association with a movable member operating within a sewage treatment pool is provided with a trough, a weir member and a transmission mechanism. The trough is fixed in position, and the transmission mechanism transmits a force from the movable member to the weir member to cause the latter to move up and down with respect to a fluid surface level. When the weir member is sunken, the scum is drawn into the trough, while when the weir member floats above the fluid surface level, the drawing of the scum into the trough is interrupted.Support of the weir member is carried out through a rotary shaft and the weir member is employed in the form of an elongated member having an elliptical cross-section so that the drawing of the scum can be carried out smoothly and stably with the transmission mechanism simplified in structure.

Abstract: A scum removal apparatus of a trough type including a weir movable in response to a movable element moving within a treatment pool. This apparatus includes an actuating mechanism operable in response to the movable element moving within the treatment pool and a transmission means for driving the weir, in which the transmission means includes a hydraulic pump and a control valve such that, while the actuating mechanism drives the pump, a hydraulic drive machine is driven selectively in one of two directions opposite to each other with the control valve being switched, thereby to selectively float and sink the weir above and below a water surface.In a different mode of carrying out the invention, the actuating mechanism includes a plurality of cam means each having a series of projections and recesses alternating with each other, said cam means being rotatable about a rotary shaft, and the transmission means is in the form of a mechanical transmission mechanism including the rotary shaft.

Abstract: An apparatus for separating solids from liquids including an endless rotatably mounted band of collecting arms for collecting screened solid material, each of the collecting arms having a leading collecting face and two opposite sides adjacent the leading collecting face, and being mounted on support rods which are arranged in spaced relationship around the band, link pieces rigidly attached to the collecting arms for linking one support rod to the next, such that the link pieces form continuous chains around the band, and separate the collecting arms one from the other to form slots between the link pieces, said link pieces being rotatable on the support rods to which they are attached, and a rotatable set of discharging teeth arranged to cooperate with said movable band by entering the slots as the band rotates to move along the leading collecting faces of the collecting arms, thereby to remove collected material gathered at the slots and from said leading collecting faces of the collecting arms.

Abstract: A first stage of a two stage apparatus for separating floating paint spray particulates from a collection tank that receives the waterfall backdrop from a commercial paint spray booth has a vertically pivotal weir hinged to a weir box that receives the resulting watery sludge as the floating solids and surface water skim over the weir. A float is connected with the weir by a dog-leg rod to control the flow over the weir at a preselected rate in response to the level of sludge in the weir box, thereby to minimize the proportion of water in the sludge. The sludge is pumped from the weir box into an inlet at the lower end of a consolidator tank. A compressed air diffuser emits streams of minute air bubbles below the inlet gently carries the floating particulates to the water surface where they accumulate and are gradually forced upward as a mass above the surface by underlying particulates continually entering the accumulator. Water from the uppermost particulates drains back into the accumulator.

Abstract: The grit conveyance system of a classifier having a wash region above the liquid layer is provided with a vacuum means in the wash region for positive removal of liquids through a metal screen for disposal.

Abstract: A bucket elevator system for a waste water treatment facility is made of non-metallic components. Buckets are carried along a bottom surface of a settling tank and then lifted above the waste water level and tilted to dump the collected waste solids onto an external disposal system. The buckets include a plurality of de-watering slots which allow the water to drain from the buckets as they are lifted from the settling tank. Split block bearing assemblies are provided for drive shafts of the conveyor.

Abstract: A tank with a generally flat, rectilinear bottom wall receives raw water for clarification by flotation. An array of lamellae define a set of generally vertically oriented channels. Flotation occurs in each channel. The channels are preferably inclined. A pair of endless chains or the like rotate alongside the tank to move a succession of mutually spaced, paddle-like lamellae through the tank. Sliding seals secured to the edge or edges of the lamellae isolate individual channels, or groups of channels, as they move through the tank. The channels lock and move a column of water through the tank with substantially no turbulence.

Abstract: A unit for cleaning liquid contaminated with solids, including a housing having a tank section defining a compartment in which contaminated liquid is deposited. The solid contaminants tend to collect as a sludge layer on the bottom wall of the tank section. The housing includes a discharge section having a base wall which inclines upwardly away from one end of the tank section. A conveyor moves along the bottom wall and thence upwardly along the inclined base wall for moving the sludge layer upwardly out of the liquid for discharge at a discharge opening. A dryer is associated with the inclined base wall and includes a pressure chamber disposed under the sludge layer for ejecting plural streams of air upwardly through the sludge layer for effecting removal of moisture therefrom. A suction chamber is disposed directly adjacent the upper side of the sludge layer in opposed relationship to the pressure chamber for collecting the moist air passing through the sludge layer.

Abstract: Disclosed herein is a wastewater treatment facility including a stacked tank clarifier having a lower tank, and an upper tank above the lower tank, the upper tank having a bottom defining a ceiling of the lower tank, and the lower tank further having a floor. The wastewater treatment facility includes a mechanism for scraping the ceiling of the lower tank. The mechanism includes a driven endless chain loop in the lower tank, and a buoyant member carried by the chain loop.

Abstract: A collector flight attachment link configured to have increased torsional load bearing ability and for supporting a collector flight on a chain including a plurality of interconnected chain links. The collector flight attachment link comprises an elongated lower link portion adapted to be interconnected with adjacent chain links in the chain. The flight attachment link also comprises a cantilevered collector flight support portion projecting upwardly from the lower link portion and including a paddle plate extending transversely to the link portion and having spaced apart first and second plate sections interconnected at their upper ends by a web section. Stress relief notches are provided between the lower edges of the paddle plate and the lower link portion.

Abstract: Liquid is contained in a source container and oil is removed from the source container and deposited into a destination container. The apparatus includes a housing having a base, at least one wall upstanding from, and encompassing the periphery of, the base, and a top cover. A two-sided piece of material made of rubber, nylon, vinyl, or other oil gathering capable material forms an endless belt or ribbon. At least one scraper device mounted within the housing facilitates removal of oil from the material. A bi-directional pulley system including a disk rotatably mounted to the housing, adapted for engaging the material, and an electric motor adapted for engaging and rotating the disk, circulate the material from the surface of the liquid through the scraper device and back to the liquid surface. A sump situated within the base of the housing is disposed to collect oil removed from the material, and a conduit from the sump to the destination container conveys oil from the sump to the destination container.

Abstract: Apparatus for removing oil from the surface of a liquid, such as a coolant, employing an endless belt partially submerged in the liquid passing through the surface. The belt is threaded over the upper portion of a primary drive roller having a horizontal axis and pressure rollers mounted upon linkage sets are biased towards opposite sides of the primary roller in engagement with the belt to squeeze the collected oil from the belt permitting the oil to flow to a collector located below the rollers. The linkage sets include reversing rollers, and the apparatus is constructed to readily permit belt replacement.

Abstract: A sprocket assembly, particularly adapted for use in wastewater settling tanks, is provided, which assembly is adapted to be supported on a shaft having a longitudinal axis. The sprocket assembly includes a polymeric sleeve adapted to be mounted on the axially extending shaft, the sleeve including a low friction bearing surface formed of ultra high molecular weight polyethylene. The sprocket assembly further includes a sprocket wheel adapted to be mounted on the bearing surface of the sleeve for rotation relative to the sleeve about the longitudinal axis of the shaft. Seals are further provided to inhibit the introduction of grit between the sleeve and the sprocket wheel.

Abstract: Apparatus for removing oil from the surface of a liquid using an endless belt partially submerged in the liquid, the belt passes over a primary roller having a vertical axis and pressure rollers squeeze the belt on the primary roller removing oil from the belt which flows by gravity to a collection receptacle mounted upon a frame supporting the primary roller and its drive structure. The belt twists whereby its lower portion submerged in the liquid defines a reversing loop whose configuration is maintained by a weight roller having a horizontal axis of rotation.

Abstract: A sludge collector mechanism for scraping settled sludge off the bottom of a settling tank is disclosed wherein a sludge collector flight comprises a high strength "H"-shaped cross section and inwardly projecting lips for engaging the outwardly projecting clips of a wear shoe to thereby secure the wear shoe to the sludge collector flight.