Abstract: Improved devices for filtration of fluid suspensions that form flow resistant filter cakes, e.g., waste-water treatment sludges, have a cylindrical filter unit mounted for rotation about an approximately horizontal axis. Influent is charged in one end, filter cake forms on an inner rigid filter media surface and discharges at the other end. Pressurized air is applied along a top, longitudinal area and vacuum assist is applied along a bottom longitudinal area of the rotating filter unit. In preferred embodiments, the cylindrical unit is formed of wire spirally wound into a cylinder with spaces therebetween, there are a plurality of spaced apart bars fixed normal to the helical wire on the inner surface and rigid filter media formed of particulate material bonded in a resin matrix fills the cavities between the bars and covers the wire spirals.

Abstract: The disclosure describes an apparatus for sorbing one or more components from a fluid.

Abstract: Strainer basket for liquid baskets with at least one tubular sighting net open at either ends and stretched between two retaining rings (1, 4) each connected with its respective end of the sighting net, either end of the sighting net being fastened between a retaining ring and a clamping ring (2) surrounding said retaining ring. With a view to obtain a simplified mounting and demounting of sighting nets and a simplified and improved cleaning of the strainer basket the clamping ring (2) is a firm ring which can be displaced across the retaining ring (1, 4) and arrested in this position by a rotary movement by which the clamping ring (2) engages a stationary stop (11) on or at the retaining ring (1, 4).

Abstract: A microscreen support wheel and assembly is provided comprising a polymeric support wheel having a crowned tread surface, an annular stress relief groove cut into each of its vertically flat, substantially parallel side faces and an axial bore designed to rotate around an axis included in a support wheel assembly constructed and arranged to hold a pair of microscreen support wheels in a laterally adjacent relationship on a rigid microscreen frame at an angle whereby optimum drum support is achieved.

Abstract: A cylindrically-shaped horizontal rotating unit which separates liquids from liquid-bearing materials, such as sludge or sewage, is the subject of this invention. After the liquid-bearing material is fed from a pipe onto a tray or head box located at the bottom of the feed end near the circumference of the unit, the material flows from onto the interior of the cylinder which contains bar screens around its circumference. The cylinder is rotated at variable speeds while the material is fed into it. When the cylinder is rotated liquids are drained from the material through bar screens contained around the circumference of the cylinder and into a drain pan below the cylinder thereby leaving the remaining material more solid. Additional features of this invention include interrupted pitched flights or blades protruding from the inside of the cylinder, which not only push the materials toward the discharge end of the cylinder but also roll the material end over end to remove even more liquid from the material.

Abstract: A filtration apparatus comprised of a rotary drum having a plurality of internal vanes for conveying slag material is presented. The slag is conveyed upwardly by the vanes, after which is falls freely onto a conveyer belt passing longitudinally through the drum. Deflectors guide the slag during its fall onto the belt. The deflectors are divergent and inclined relative to the direction of movement of the conveyer belt. The rotatable drum is axially subdivided into a plurality of sections, the vanes of each section being angularly offset in relation to the vanes of adjacent sections. The filtering apparatus herein effects uniform charging of slag material onto the conveyer belt.

Abstract: A rotary digester comprises a shell having means at one end for entry of material to be digested and, at the opposite end, a liquids outlet surrounded by a solids outlets. The solids outlet has a screw which assists in preventing egress of unwanted liquid with the solids.

Abstract: The present invention relates to a device for the separation of a liquid from a sludge (12) or a liquid containing particles by means of a rotatable drum (1), inside which an inlet device for the supply of a sludge (12) or of a liquid containing particles debouches, the jacket (3) of said drum exhibiting ports (2) for making said separation of liquid possible, the drum (1) in its interior exhibiting a screw-type flange element (11) for the forward feed of the sludge, which flange (11) follows the rotating movement of the drum, said flange (11) extending from the inside of the jacket (3A) of the drum in direction towards the center (13) of the same.The invention makes possible an effective supply of sludge (12) etc. to the interior of the drum and an effective separation of liquid from said sludge (12).

Abstract: A filtration apparatus comprised of a rotary drum having a plurality of internal vanes for conveying slag material therein therein is presented. The slag is conveyed upwardly by the vanes, after which it falls freely onto a conveyer belt passing longitudinally through the drum. Each vane consists of a retaining blade and a liquid permeable filtering blade spaced from the retaining blade. A deflecting means is positioned beneath the filtering blade. The deflecting means includes a deflecting plate associated with a support member. The support member and the retaining blade provide a supporting frame work for the rotary drum.

Abstract: Apparatus for concentrating solids from a solids/liquid mixture, particularly sludge from a waste stream/flocculating polymer mixture, includes a frusto-conically shaped drum. A solids/liquid mixture is introduced through a conduit into a large end of the rotary driven conical drum. A maximum amount of the free liquid in the mixture is released from the drum through its screen side wall near the large entrance end of the drum. The solids in the drum, after initial release of the liquid therefrom, are moved during their travel to the smaller exit end of the drum where the surface movement of the drum is slower. The resulting thickened or dewatered solids are removed from the smaller end of the drum as a formed cake or in the form of thickened sludge.

Abstract: A rotary screen separator is described for separating liquids and solids from a slurry. The rotary screen separator includes a cylindrical straining screen rotatably mounted for rotation about a substantially horizontal axis. The separator has a drive for rotating the straining screen at a constant low speed. The separator has a slurry feed means mounted within the interior of the straining screen for spreading the slurry into a thin curtain and directing the curtain downward against a downward moving portion of the straining screen to direct the slurry against the inner surface to enable liquid to pass through the screen to the outer surface and to push the solid materials forward along the inside surface to clean the inside surface. A compression roller is freely mounted within the straining screen for rolling with the moving screen to compress the solid material against the inner surface to remove additional liquid.

Abstract: Oil sand feedstock is mixed in a tumbler with steam and water in the presence of inwardly extending oleophilic surface, that are attached to the drum interior, for the purpose of enhancing oil particle size thereby producing an oil sand slurry suitable for subsequent separation. Undigested oil sand, oversize rocks and debris may be removed prior to said separation.

Abstract: Apparatus for extracting liquid from a suspension includes a horizontally mounted rotatable filter media covered concentrator drum with an inner drum rotatable about a horizontal axis within the concentrator drum and defining a suspension transition chamber therebetween. The drums are mounted in a common frame and are rotated in opposite directions with the suspension being introduced at one end of the transition chamber. Angularly disposed vanes on the outer surface of the inner drum convey the suspension through the transition chamber and turn and lift the suspension to a maximum elevation below the top of the transition chamber with the suspension falling back before reaching the top of the transition chamber. The filter media is cleaned as it moves at an elevation above the suspension.

Abstract: A cleaning filter has a cylindrical tank through which an axial pipe extends, the pipe having a screw blade attached thereon and being rotatable in the tank. A drum rotatably carried on the axial pipe is disposed within the tank and around the screw blade, the drum having a cylindrical body and an end cover mounted on the cylindrical body such that the cylindrical body is rotatable relative to the end cover. The end cover has a cleansing agent inlet and a cleansing agent outlet with the cleansing agent being removed from the drum by rotating the pipe means and the screw blade, the latter engaging the cleansing agent in the drum to thereby move the cleansing agent axially to the cleansing agent outlet.

Abstract: A sieve apparatus containing a circular sieve or screen, possessing at a portion of its circumference an impervious region. The impervious region of the circular screen forms a trough in which there can be formed a liquid sump for washing the material which is to be treated. In the case of a circular sieve or screen, formed of perforated sheet metal, the impervious region can be free of holes or openings. If the circular sieve or screen is formed of a sieve or filter material, then the circular sieve is covered at the impervious region. Spray tubes or the like serve for spraying the circular sieve, the material which is to be treated and for forming the liquid sump.

Abstract: A filter for removing solids from a liquid of the type wherein a rotatable basket or drum has media inside straining from inside out. A power operated conveyor is mounted in the drum above the axis of rotation for receiving and positively removing solids. Thus, a liquid level is possible above the axis of rotation but below the conveyor so that a large filter area is in contact with the liquid while not interfering with the operation of the conveyor. A retractable scoop is provided for positively delivering the solids to the conveyor with an alternate sealing arrangement. A discharge ramp is carried adjacent an end of a baffle which extends above a liquid inlet upwardly toward the conveyor and is spaced from an inner wall of the drum to collect solids therebetween and accommodate the scoop for their removal. An improved means for equalizing the distribution of the liquid within the drum is also provided.

Abstract: The open inlet end of a microscreen drum is defined by a circular track which is supported on rollers above the flow. The stationary wall supporting the rollers carries a flange-type flexible seal extending in a partial circle around the opening in the wall. The track carries a fully circular flange and a low-friction, slit tubing covers its axially projecting edge and is engaged by the flexible seal.

Abstract: A filtering and washing device has a filter body mounted in a housing for rotation about a horizontal axis and comprising a first portion in the form of a truncated cone or pyramid having a base plate with an eccentrically positioned polygonal orifice and a second portion in the form of a sawtooth-shaped tube rigidly connected at one end to the orifice and at an opposite end to a cylindrical drive shaft rotatably journaled in the housing and operationally connected to a motor, the tube in turn being formed from a multiplicity of hollow prisms or truncated pyramids. The first and second portions have surfaces provided with respective filter means. A pipe fixed to the housing traverses an end plate of the first portion opposite the base plate for rotatably supporting the filter body at one end and for feeding to the first portion material to be filtered or cleaned, while the tube is provided with an opening spaced from the base plate of the first portion for dispensing treated material.

Abstract: Means to feed material to be sieved into the receiving end of an open-ended, substantially horizontal, rotary sieving sleeve, comprise a trunk disposed coaxially with the sleeve and having a material-receiving end outside the sleeve and the other end portion projecting into the sleeve by an amount equal to from one half to one quarter the length of the sleeve. The portion of the trunk within the sleeve has a material departure aperture formed in the top of that portion. This aperture is in the form of a horizontal weir which extends axially of said portion for a distance at least equal to half the axial length of said portion measured from the innermost end thereof.

Abstract: The method of treating sewer scum including combustibles and debris includes the steps of collecting the scum from sewage, delivering it to a perforated filter drum, continuously rotating the drum upon an inclined longitudinal axis, applying heated air under pressure to the exterior of the drum along its length inwardly of the perforations, discharging the debris continuously and collecting the filtered combustibles. Apparatus for filtering said scum includes an elongated cylindrical perforated drum rotatable on an inclined axis receiving scum at its upper end and discharging debris at its lower end. A cylindrical shell sealingly encloses the perforated portion of the drum for providing a pressure chamber above the drum and a collection chamber below the drum. An elongated air channel along the interior of the shell delivers high pressure heated air to said pressure chamber and filtered scum accumulates in the collection chamber.

Abstract: An apparatus for the separation of solids and liquids from a suspension has a hollow drum rotatably mounted about a horizontal axis. The drum wall is a screen made of a plurality of wires, preferably wedge-sectioned wires; spaced apart in a parallel arrangement and lying axially along the drum. Inlet means direct the suspension against the inner surface of the wall at an angle less than right angles, and preferably substantially tangentially to the inner surface, in a direction opposing the rotation of the drum. The separated solids remain within the drum and are extracted therefrom by suitable means.

Abstract: Clarifier sludge is dewatered to a relatively low residual moisture content by passing it axially in one direction through an inner centrifuge drum in which initial dewatering takes place in a first centrifugal force field. Immediately thereafter the solids phase is introduced into an outer second drum having a diameter approximately twice that of the first and in which the solids are subjected to a centrifugal force field about twice as great as the first force field. In each drum the solids are displaced by wipers or scrapers (strippers) preferably of the worm type and the liquid is drawn from the drum at the opposite axial end from that at which the solids are removed.

Abstract: Drop-back of solids into the drum pool of a rotary microscreen is reduced by applying a limited gas pressure differential across an unsubmerged portion of the screen cloth. The pressure is not for the purpose of increasing the driving force, .DELTA.H, of the liquid passing through the cloth. For purposes of this disclosure, .DELTA.H is the pressure differential existing across the screen below the surface of both the drum pool and tank pool. In fact, assuming other factors remain equal, application of a gas pressure differential to an unsubmerged portion of the screen cloth, with consequent reduction in drum pool suspended solids concentration, will normally reduce .DELTA.H even though the gas pressure also acts on the surface of the drum pool. More significantly, the invention enables operation of a microscreen unit at increased flow capacity at a given .DELTA.H. Whatever pressure is applied, there will be some reduction of torque, bearing load and wear at any given .DELTA.H.

Abstract: A frusto-conical screen separator having its longitudinal axis inclined from the horizontal so that its undersurface lies in an essentially horizontal plane, the separator being divided internally into three zones, the first zone comprising a dewatering zone at its largest diameter end, the second zone comprising a washing zone, and the third zone comprising a final dewatering zone at its smallest diameter end, the separator having external shower means overlying the first and second zones, breaker bars in the first zone, internal baffle means in the second zone, and guide bars in the third zone, the materials to be separated passing through the separator from its larger to its smaller end, a recovery tank underlying the separator for recovering separated materials passing through the screen, the unscreened residual materials being discharged at the smaller end of the separator.

Abstract: Filtering apparatus comprising a stationary housing and a rotary filter d having a peripheral filter screen with elongated filter openings extending parallel to an axis thereof and disposed within the housing to define a space between the filter drum and the housing. A sludgy liquid supply means is provided for supplying the sludgy liquid from the inside of the filter drum onto the inner surface of the filter screen. Solid component adheres to the filter screen and liquid component passes through the elongated filter openings of the filter screen into the space, said solid component on the filter screen being discharged from the interior of the filter drum through the housing in the form of aggregations of filtration residue and said liquid component being discharged from the space through an outlet opening as filtrate.

Abstract: Continuous filtration under pressure is obtained by combination of a looped filter belt and an alveolar belt which are caused to cooperate with a rotary distributor drum. The belts are compressed against the drum through application onto the belts of an external pressure which is at least equal to the filtration pressure but which is exerted on a surface which is larger than that onto which the filtration pressure is exerted.

Abstract: A rotary driven conical drum into a large end of which sludge and a flocculating polymer are discharged, constitutes a contact chamber, and is equipped with baffles and weirs. The polymer is supplied to a large end of the drum and mixing is accomplished in the large end of the drum where the surface area of the drum is moving most rapidly. Thereafter the mixing action is slowed down by travel of the mixture to the smaller end of the drum, where the surface area of the drum is moving more slowly, to build up the flocs. The sludge/polymer mixture produced in the contact drum is then discharged through a conduit into the large end of a rotary driven conical concentrator drum. A maximum amount of the free water in the mixture is released from the concentrator drum through its screen side wall at the large end of said drum. The flocs remaining in the screen drum, after initial release of the water therefrom, are protected by their travel to the smaller end of the drum where the surface movement is slower.

Abstract: Slurrying of water-wet wax particles in liquid hydrocarbon carrier is improved by introducing the water wet particles in a rotating perforated cylinder, e.g., screen, immersed in a flowing stream of liquid carrier above a settling chamber. The flow rates of the liquid carrier and the water-wet particles are controlled to give desired water separation and slurry concentrations for subsequent pipelining. The water falls to the bottom of the settling chamber for removal.

Abstract: An apparatus for extracting components of solids, by means of a liquid contacting the solids in counter-current flow, comprises a rotating drum with a substantially horizontal axis, which drum has generally axial compartments extending from one end to the other. The materials to be extracted and the liquid are supplied to opposite ends of the compartments. The compartments have along a cross-section at right angle to the drum axis in the general shape of a circle sector the apex of which merges with the drum axis. At least those walls of the compartments extending generally radially are pervious to the liquid and the liquid level inside the drum is lower than the drum axis level.

Abstract: The specification discloses an improvement in rotary drum screens for the filtration of liquids which comprise (a) a drum having a central horizontal axis and a radially outer surface, (b) a plurality of microscreen grids mounted on the radially outer surface of the drum, each of the microscreen grids comprising a screen which is divided into a large number of small cells by walls which extend radially with respect to the drum, (c) means for introducing the liquid to be filtered into the interior of the drum, (d) means for rotating the drum about its central axis, (e) a backwash header mounted outside the radially outer surface of the drum, and (f) a backwash receiving trough mounted within the drum for collecting filtrate accumulated on the screen. The liquid to be filtered is introduced into the drum at one end thereof, and the drum is supported so that it is partially submerged in the filtered liquid.

Abstract: Filtration in an internal rotary filter system is improved by externally impacting the filter screen as it rotates with a programmed spray of liquid that is varied from a relatively low to a relatively high pressure. In certain instances, this programmed spray is controlled by an electric timer circuit so arranged that the high pressure spray is on for a period of time which does not too unduly burden the system with fluid, but which is sufficient period of time to prevent slime formation on the screen. This can for instance keep the screen free of slime when no germicidal agent (e.g. Cl.sub.2) is employed.

Abstract: A filter is spread over each side of the strainer casing rotated by a horizontal driving shaft, and a plurality of radially extending partition plates are provided in the inside peripheral part of said casing, whereby alien matter such as sludge contained in the liquid supplied into said casing is separated by said filters. The alien matter such as sludge remaining in the casing is moved upwardly with rotation of the casing and then dropped gravitationally into a chute-like passage and thereby discharged out of the casing.

Abstract: A rotary strainer comprising a revolving box-like structure having a horizontal axis of revolution and a filtering net stretched around the external periphery of said box-like structure, wherein a mixture of liquid and solids is introduced into said box-like structure so as to primarily separate said solids and liquid by said filtering net, with the thus separated solids being dropped with rotation of said box-like structure onto a screw conveyor extending through the inside of said structure so as to discharge the separated solids out of the structure by said conveyor, and the bottom face of a screw conveyor chute provided below the screw is slanted downwardly toward the box-like structure so that the liquid adhering to the primarily separated solids will flow back toward said box-like structure by dint of said slant for further separation.