WO2015110945A1 - Tamis comprenant des déflecteurs d'écoulement de filtrat - Google Patents

Tamis comprenant des déflecteurs d'écoulement de filtrat Download PDF

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Publication number
WO2015110945A1
WO2015110945A1 PCT/IB2015/050375 IB2015050375W WO2015110945A1 WO 2015110945 A1 WO2015110945 A1 WO 2015110945A1 IB 2015050375 W IB2015050375 W IB 2015050375W WO 2015110945 A1 WO2015110945 A1 WO 2015110945A1
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WO
WIPO (PCT)
Prior art keywords
screen
section
filtrate flow
filtrate
angle
Prior art date
Application number
PCT/IB2015/050375
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English (en)
Inventor
Brad Michael Reynolds
Matthew John Joseph Keppel
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Concept Solutions Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Concept Solutions Limited filed Critical Concept Solutions Limited
Publication of WO2015110945A1 publication Critical patent/WO2015110945A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/74—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging filtrate
    • B01D33/742—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging filtrate containing fixed liquid displacement elements or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/11—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for outward flow filtration

Definitions

  • the present invention relates to one or more deflector(s) or baffle(s) attached to, or integrally formed as a part of, the discharge side of a static or rotating screen used to filter a solids contaminated fluid.
  • a static or rotating screen used to filter a solids contaminated fluid.
  • the screen is used to process waste material from animal drafting yards and animal or dairy/beef/wintering sheds; but they can also be used for agricultural, industrial or municipal waste streams.
  • the processing of fluid waste streams containing suspended and/or undissolved solids often involves the use of a screen to separate some or all of the fluid from the solids.
  • These screens can be mesh, a perforated plate or sheet, closely spaced elongate members of the same or different cross sections (for example round, triangular or isosceles trapezoidal wires), or similar configurations that produce a plurality of suitably sized apertures.
  • the screens retain some or all of the solid material with some of the liquid as a retentate, and the filtrate flows through the screen.
  • the efficiency of the screen to remove the filtrate is lowered if the discharge side of the screen becomes saturated with filtrate, or blocked as the filtrate evaporates. This efficiency drop can be compensated for by oversizing plant, but this adds to the cost.
  • the angle of the screen can be reduced so that the filtrate quickly moves away from the discharge side. If the angle of the screen is reduced too far the waste stream and retentate may not clear from the inlet (feed side) side of the screen, and the screen efficiency can drop because the inlet side has become clogged. This can limit the minimum angle of a static screen, unless some other method of clearing the retentate is provided. As the angle of the screen decreases the area required for the processing plant increases and this can drive up the costs or, if space is limited, prevent the use of a screen.
  • Using a rotary drum screen continually changes the section of the screen in contact with the retentate/waste material and this can aid in keeping the inlet side of the screen clean, but rotary screens do have a higher cost, and are not immune to saturation or contamination efficiency drops.
  • the screen can be directly exposed to sunlight, this commonly occurs in waste treatment applications, and this can accelerate the blocking of the discharge side of the screen by concentrating the filtrate. Some filtrates may harden or increase in viscosity when heated or exposed to sunlight and this may further increase the risk of blocking. To reduce the effect of sunlight the screen could be enclosed, but this can add to the cost and make easy inspection difficult.
  • the invention provides a screen configured to separate an incoming stream into a filtrate and a retentate, wherein the screen includes a plurality of spaced filtrate flow deflectors that each extend most, or all, of the horizontal dimension of the screen; each filtrate flow deflector is located on, and attached or located close to, a discharge side of said screen, such that each filtrate flow deflector includes a first section, a primary edge, and a secondary edge where:-
  • the primary edge is the uppermost or leading peripheral edge of the filtrate flow deflector
  • the primary edge is the edge of the filtrate flow deflector located closest to the discharge side of the screen
  • each filtrate flow deflector is configured to provide a pathway for the filtrate away from the discharge side of the screen.
  • the term high in solids indicates that the solids content of the retentate is higher than the concentration (w/w) of solids in the incoming stream, and the term low in solids indicates the solids content is lower than concentration (w/w) of solids in the incoming stream. It should be noted that as a screen only removes solids above a certain size the high and low refers to the solids above this certain size.
  • the screen is either a static screen or a rotary screen. It is preferred that if the screen is a rotary screen which includes a drum that the filtrate flow deflectors are spaced around the circumference of the drum.
  • the filtrate flow deflectors are equidistantly spaced apart, vertically or circumferentially.
  • at least one of the filtrate flow deflectors is attached to the discharge side of the screen.
  • the primary edge of at least one of the filtrate flow deflectors engages with but is not attached to the discharge side of the screen.
  • the primary edge of at least one of the filtrate flow deflectors lies close to, but is not attached to, the discharge side of the screen.
  • the screen includes at least one flow deflector support which is attached to at least one of the filtrate flow deflectors.
  • the first section is at an angle ⁇ to the screen.
  • the angle ⁇ is from 5 e to 90 e .
  • the angle ⁇ is in a range selected from the group consisting of 5 e to 90 e , 10 e to 90 e , 10 e to 80 e , 15 e to 90 e , 15 e to 80 e , 20 e to 90 e , 20 e to 80 e , 25 e to 90 e , 25 e to 80 e , 30 e to 90 e , 30 e to 80 e and any of these ranges with 80 e replaced with an angle selected from 30 e to 79 e or the 5 e replaced with any angle between 5 e and 80°.
  • each filtrate flow deflector has a cross-sectional profile that includes a plurality of curved or linear sections.
  • at least one section is attached to the immediately adjacent section by a hinge joint.
  • the or each hinge joint is configured to allow the angle between the two sections it connects to be independently adjusted.
  • the cross-sectional profile includes the first section, a second section and a third section, where the second section lies between, and is coterminous with, the first section and the third section.
  • each section has a linear or curved cross sectional profile.
  • each section has a linear profile.
  • first section and second section are coterminous at a first bend
  • second section and the third section are coterminous at a second bend
  • the second section is at an angle to the screen which is greater than the angle ⁇
  • the second section is at an angle to the screen which is less than the angle ⁇ .
  • the angle ⁇ is between 10 e and 75 e , and preferably between 10 e and 60 e .
  • the angle between the screen and the third section is the angle ⁇ .
  • At least one of the filtrate flow deflectors consists of a plurality of sub-units. These sub-units may be touching, spaced, overlapping, staggered or at a variety of angles but in combination they make up a single alternative filtrate flow deflector.
  • the length of the first and third sections is less than the length of the second sections.
  • At least one of the filtrate flow deflectors includes lengthwise spaced features configured to increase the rigidity or resilience of that filtrate flow deflector.
  • the screen includes a collection casing which is a structure lying close and/or attached to a secondary edge of at least one filtrate flow deflector configured to provide a flow path for the filtrate from the filtrate flow deflectors to a collection point.
  • the collection casing is a flat or curved plate.
  • the collection casing is close and/or attached to each of the filtrate flow deflectors.
  • the screen is used to process a farm effluent stream such as dairy shed, wintering shed or stockyard effluent.
  • Figure 1 is a side view, showing the discharge side, of a static screen with filtrate flow deflectors attached (the apertures through the screen are omitted in this view for clarity);
  • Figure 2 is a cross sectional view, along the line W-W in the direction of the arrows, of a static screen with filtrate flow deflectors attached;
  • Figure 3 is an enlarged view of the cross section of the static screen shown in
  • Figure 4 is a side view of a rotary screen with filtrate flow deflectors attached (the apertures through the screen are omitted in this view for clarity);
  • Figure 5 is a cross sectional view, along the line X-X in the direction of the arrows, of a rotary screen with filtrate flow deflectors attached;
  • Figure 6 is the cross sectional view shown in Figure 5, with the rotary screen in use;
  • Figure 6A is an enlarged view of a section of the cross sectional view shown in
  • Figure 7 is an enlarged view of a section of the static screen showing a single filtrate flow deflector attached
  • Figure 8 is an enlarged view of a section of the rotary screen showing a single filtrate flow deflector attached
  • Figure 9 is a cross sectional view of a plurality of different filtrate flow diverter cross sections
  • Figure 10 is a cross sectional view of a portion of a screen with a filtrate flow diverter attached, with a collection casing in place;
  • Figure 1 1 is a side view of a second variant of the static screen with the filtrate flow deflectors at an angle to the horizontal;
  • Figure 12 is a side view of a third variant of the filtrate flow deflectors, where the filtrate flow deflectors are not attached to the screen.
  • Figure 13 is a side view of alternative filtrate flow deflectors consisting of staggered, but horizontally aligned, sub-units.
  • Clear section this is intended to refer to a section of the discharge side of the screen that is not saturated (flooded) or blocked/clogged by filtrate or dried /concentrated filtrate.
  • the screen can be flat or curved plate or sheet with a plurality of apertures, a series of spaced elongate members lying alongside each other (the spaces between forming the apertures), a mesh or a combination of these. Where elongate members are used these can have any suitable cross sectional shape, for example round, elliptical, oval, square, rectangular, triangular, trapezoidal (regular or isosceles), star or more complex, and be solid or hollow; they may also be linear or curved, and parallel or angled with relation to the immediately adjacent elongate members.
  • the apertures in a screen do not need to be all the same size or shape, and they may vary over the surface and/or from one end and/or edge to the other.
  • a plurality of filtrate flow deflectors (1 ) are shown attached to the discharge side (2) of a static screen (3).
  • the static screen (3) is shown in use separating an incoming steam (4) into a filtrate (5) and a retentate (6).
  • the incoming stream (4) is fed onto the inlet side (7) of the static screen (3), the filtrate (5) passes through the static screen (3) to the discharge side (2), and the retentate (6) is retained on the inlet side (7).
  • the filtrate (5) is a liquid rich stream and the retentate (6) is a solids rich stream.
  • the static screen (3) is shown isolated from any ancillary equipment for clarity.
  • each filtrate flow deflector (1 ) in the configuration shown extends along the full width of the static screen (3).
  • the longitudinal axis of each filtrate flow deflector (1 ) is aligned approximately parallel to a first edge (13) of the static screen (3).
  • the first edge (13) is the uppermost, essentially horizontal edge, of the static screen (3), when the static screen (3) is installed. It should be noted that though it is preferred that all of the filtrate flow deflectors (1 ) are approximately parallel, certain configurations may require that this is not the case. For example there may be an advantage with certain adjacent filtrate flow diverters (1 ) are converging along their length.
  • Each filtrate flow deflector (1 ) is spaced apart from the immediately adjacent filtrate flow deflectors (1 ). This spacing is dependent on the static screen (3) configuration and what it is processing, but, for dairy shed effluent a spacing of from 100mm to 150mm has been found successful. It is expected that this spacing will be from 75mm to 250mm for most applications.
  • the static screen (3) in Figures 2 and 3 is shown at about 50 e to 60 e from the horizontal but this is angle is dependent on the application and could be anything from 10 e to close to 90 e .
  • the angle of the static screen (3) is expected to be from about 30 e to 85 e .
  • the inventors have found that with the filtrate flow diverters (1 ) in place the angle of the static screen (3) can be increased without the discharge side (2) saturating/flooding or blocking, and the efficiency of the static screen (3) increases. As the angle is increased the retentate (6) clearance often improves and the screen efficiency may increase. Increased screen angles can also improve the volumetric throughput of a static screen (3) whilst maintaining the separation efficiency which reduces the size of the plant required to process a given incoming stream (4) volume.
  • FIG. 6A a rotary screen (9), and detail of a section of this rotary screen (9) respectively, is shown, with a plurality of filtrate flow deflectors (1 ) attached to the discharge side (2).
  • FIG 6 and 6A which show the rotary screen (9) in use, the incoming stream (4) is introduced to the interior (8) of rotary screen (9).
  • the direction of rotation of the rotary screen (9) is indicated by the arrow labelled (D).
  • the direction of flow of the filtrate (5) is indicated by the arrows labelled (B), the retentate (6) moves longitudinally along a rotary screen (9) and as such no arrow (C) is present.
  • each filtrate flow deflector (1 ) extends along the length of the rotary screen (9), and, though shown essentially parallel to the longitudinal axis of the rotary screen (9), this is only the preferred configuration.
  • the filtrate flow deflectors (1 ) attached to the discharge side (2) of the static screen (3) are shown as longitudinally bent flat strips of material.
  • the material used for the filtrate flow deflectors (1 ) may be the same as that used for the static screen (3), or different, and it is most likely to be a rigid material such as metal, plastic, composites (including carbon fibre and fibre glass), glass, ceramic and combinations of these.
  • a preferred form of a filtrate flow deflector (1 ) attached to a static screen (3) is shown, in this form there are two bends, a first bend (14) and a second bend (15), which extend the length of the associated filtrate flow deflector (1 ).
  • These bends (14,15) form three sections (16,17,18) extending the length of each filtrate flow deflector (1 ), a first section (16), a second section (17) and a third section (18) .
  • the first bend (14) forms the intersection between the first section (16) and the second section (17)
  • the second bend (15) forms the intersection between the second section (17) and the third section (18).
  • One end of the first section (16) is coterminous with a primary edge (19) of the associated filtrate flow deflector (1 ) and one end of the third section (18) is coterminous with a secondary side (20) of the associated filtrate flow deflector (1 ).
  • the second section (17) lies between the first and third sections (16,18).
  • the primary edge (19) is attached to the static screen (3) at an angle ⁇ , where the angle ⁇ is the angle between a tangent to the surface of the discharge side (2), at the point of attachment of the filtrate flow deflector (1 ), and the first section (16).
  • the angle between a tangent to the surface of the discharge side (2) and the second section (17) is greater than the angle ⁇ , and the angle between a tangent to the surface of the discharge side (2) and the third section (18) is preferably the angle ⁇ .
  • the attachment between the static screen (3) and the filtrate flow deflector (1 ) may be a rigid or flexible attachment of a permanent or releasable form e.g. welded, attached by known fastening device (nuts and bolts, screws, rivets), attached by flexible elastomeric polymer, glued, slid into preformed apertures in static screen, pinned, pins with split pins or a combination of any of these, or similar devices.
  • the filtrate flow deflector (1 ) may also be integrally formed as part of the static screen (3).
  • the angle ⁇ depends on the application but for a static screen this is expected to be in the range of 10° to 60° as it is important not to interfere with the clear sections labelled (E) created downstream of each filtrate flow collector (1 ) when the static screen (3) is in use.
  • a preferred form of a filtrate flow deflector (1 ) attached to a section of a rotary screen (3) is shown, in this form there are two bends, a first bend (14) and a second bend (15), which extend the length of the associated filtrate flow deflector (1 ).
  • These bends (14,15) form three sections (16,17,18) extending the length of each filtrate flow deflector (1 ), a first section (16), a second section (17) and a third section (18) .
  • the first bend (14) forms the intersection between the first section (16) and the second section (17)
  • the second bend (15) forms the intersection between the second section (17) and the third section (18).
  • One end of the first section (16) is coterminous with a primary edge (19) of the associated filtrate flow deflector (1 ) and one end of the third section (18) is coterminous with a secondary edge (20) of the associated filtrate flow deflector (1 ).
  • the second section (17) lies between the first and third sections (16,18).
  • the primary edge (19) is attached to the rotary screen (3) at an angle ⁇ , where the angle ⁇ is the angle between a tangent to the surface of the discharge side (2), at the point of attachment of the filtrate flow deflector (1 ), and the first section (16).
  • the angle between a tangent to the surface of the discharge side (2), at the point of attachment of the filtrate flow deflector (1 ), and the second section (17) is less than the angle ⁇ .
  • the angle between a tangent to the surface of the discharge side (2), at the point of attachment of the filtrate flow deflector (1 ), and the third section (18) is preferably the angle ⁇ .
  • the attachment between the rotary screen (9) and the filtrate flow deflector (1 ) may be a rigid or flexible attachment of a permanent or releasable form e.g. welded, attached by known fastening device (nuts and bolts, screws, rivets), attached by flexible elastomeric polymer, glued, slid into preformed apertures in static screen, pinned, pins with split pins or a combination of any of these, or similar devices.
  • the filtrate flow deflector (1 ) may also be formed as part of the rotary screen (9).
  • the angle ⁇ depends on the application, but, for a static screen (3), this is expected to be in the range of 10° to just less than 90°. As it is important not to interfere with the clear sections labelled (E), created immediately downstream of each filtrate flow collector (1 ), the preferred range is between 35° and just less than 90°.
  • the attachment to the rotary screen (9), the first section (16), or the entire filtrate flow deflector (1 ), may bias the filtrate flow deflector (1 ) to an extended position (normal operating position) but allow the filtrate flow deflector (1 ) to lie against, or move closer to, the discharge side (2) under certain conditions.
  • This configuration may also be applied to a static screen (3) for transport or to allow the filtrate flow deflectors to better absorb impacts without damage.
  • the angle ⁇ depends on the configuration of the filtrate flow deflector (1 ) and as such, if the filtrate flow deflector (1 ) described for use with the rotary screen (9) is used with the static screen (3) then, the range of angles for ⁇ specified for the rotary screen (9) applies. Similarly if the filtrate flow deflector (1 ) described for use with the static screen (3) is used with the rotary screen (9) then the range of angles for ⁇ specified for the static screen (3) applies.
  • the cross-sectional shape of the filtrate flow deflectors (1 ) may vary from that preferred, a number of alternative cross-sectional profiles are shown in Figure 9, labelled (i), (ii), (iii), (iv), (v) and (vi) where:
  • (v) is similar to that described in (i) and (ii) but has only a first section and a second section with no third section;
  • (vi) is a series of short strips of material connected together by hinge joints (25), this allows the profile of the filtrate flow deflector (1 ) to be adjusted. Though the filtrate flow deflector (1 ) is shown with three hinge joints (25) this number could be any whole number from 1 upwards;
  • the bends (14,15) and other features described in some cases can be simply to increase the resilience or rigidity of the filtrate flow deflector (1 ).
  • a filtrate flow deflector (1 ) could be stiffened by a series of ribs or bends (or other profile features not apparent in cross section) spaced along the length said filtrate flow deflector (1 ).
  • the profile features used may also act to guide the filtrate (5).
  • Figure 10 shows a section of a screen (3.9) in cross section with a collection casing (26) in place.
  • the collection casing (26) is a plate (curved or planar) located close the secondary edge (20) of each filtrate flow deflector (1 ) that collects the filtrate (5) from the filtrate flow deflectors (1 ).
  • This collection casing (26) provides a path from the filtrate flow deflectors (1 ) to a collection point (not shown) for the filtrate (5) to follow which minimises the surface area of the filtrate (5) exposed to the air.
  • This collection casing (26) has been found to reduce or eliminate odours from the screen (3,9) when in use.
  • the distance between the secondary edge (20) and the closest part of the collection casing (26) is preferably from 1 mm to 25 mm.
  • a static screen (3) is shown with each filtrate flow deflector (1 ) parallel to the immediately adjacent filtrate flow deflectors (1 ) but at an angle ⁇ to the horizontal.
  • This angle ⁇ may allow the filtrate (5) flowing on the filtrate flow deflectors (1 ) to be collected at one end of the static screen (3) potentially avoiding the need for an collection casing (26) (not shown in Figure 1 1 ) but still reduce surface area of the filtrate (5) exposed to the air.
  • This angle ⁇ is expected to be from 1 e to 45 e but may be as great as 60 e , the preferred range is from 1 e to 30 e .
  • one alternative filtrate flow deflector (1 10) is shown consisting not of a single unit extending the entire horizontal dimension of the screen (3,9) but a plurality of horizontally spaced sub-units (1 1 1 ).
  • the sub-units (1 1 1 ) are shown vertically staggered but touching, they can be spaced apart (not shown) or staggered so that they overlap slightly (see Figure 13), providing the alternative filtrate flow deflector (1 10) still extends most, if not all.
  • a second variant of the filtrate flow deflectors (1 ) is shown, in this variant the filtrate flow deflectors (1 ) are not attached to the screen (3,9) they are attached to a flow deflector support (29).
  • the flow deflector support (29) may be a series of strips attached along the length of the each filtrate flow deflector (1 ), a plate extending partially or fully along the length of the screen (3,9), a collection casing (26), part of the screen support structure (not shown), end plates attached to the ends of the screen (3,9) or any other suitable structure that holds each filtrate flow deflector (1 ) in the required location.
  • the first section (16) may be a resilient material such as spring steel (stainless or normal), resilient plastic, rubber (natural or synthetic), silicone elastomer, or similar material.
  • the distance between the primary edge (19) of each filtrate flow deflector (1 ) and the closest point of the screen (3,9) is from 0mm to 5mm, though preferably 0 mm to 2mm.
  • FIG 13 a further variant of the screen (3,9), with the alternative filtrate flow deflectors (1 10) shown as dashed boxes, is shown.
  • each of the alternative filtrate flow deflectors (1 10) consists of a plurality of sub-units (1 1 1 ) which are staggered.
  • Each sub-unit (1 1 1 ) is horizontally and vertically separated from any immediately adjacent sub-units (1 1 1 ) in that alternative filtrate flow deflector (1 10).
  • Three sub-units (1 1 1 ) are shown for each alternative filtrate flow deflector (1 10) but there could be any number of sub-units from 2 upwards, there could be 3,4,5,6,7,8,9,10,1 1 or more.
  • some of the sub-units (1 1 1 ) may have a different profile and some of the sub-units (1 1 1 ) may be at a different angles.
  • Each filtrate flow deflector (1 ) is designed to take the filtrate (5) away from the discharge side (2) of the screen (3,9) to minimise the saturation (flooding) and/or clogging of the screen (3,9) in use.
  • each filtrate flow deflector (1 ) can act as a sunshade for a portion of the discharge side (2), this shading can prevent or minimise the amount of the filtrate (5) concentrating or drying onto the discharge side
  • filtrate flow deflector (1 ) may therefore vary from that described but still achieve the same goal in the same way. It is intended that each filtrate flow deflector (1 ) extends most of the entire horizontal dimension of the screen (3,9), and the term most is intended to refer to at least 90% of the horizontal dimension as there may, for example, be gaps at each end.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

La présente invention concerne un tamis conçu pour séparer un flux entrant en un filtrat et un rétentat, le tamis comprenant une pluralité de déflecteurs d'écoulement de filtrat espacés s'étendant chacun essentiellement, ou totalement, depuis la dimension horizontale du tamis ; chaque déflecteur d'écoulement de filtrat se situe sur, et est fixé ou situé près, d'un côté évacuation dudit tamis, de telle sorte que chaque déflecteur d'écoulement de filtrat comprend une première section, un bord primaire, et un bord secondaire : - le bord primaire étant le plus élevé ou le bord périphérique d'attaque du déflecteur d'écoulement de filtrat ; - une extrémité de la première section coïncidant avec le bord primaire ; - le bord primaire et le bord secondaire étant des bords périphériques en regard du déflecteur d'écoulement de filtrat ; et - le bord primaire étant le bord du déflecteur d'écoulement de filtrat le plus proche du côté évacuation du tamis ; et chaque déflecteur d'écoulement de filtrat est conçu pour fournir un chemin permettant d'éloigner le filtrat du côté évacuation du tamis.
PCT/IB2015/050375 2014-01-22 2015-01-18 Tamis comprenant des déflecteurs d'écoulement de filtrat WO2015110945A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NZ620234 2014-01-22
NZ62023414 2014-01-22
NZ703855 2015-01-14
NZ70385515 2015-01-14

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA476880A (fr) * 1951-09-11 G. Lesniak Frank Appareils a epaissir
US3241675A (en) * 1962-06-04 1966-03-22 Ajem Lab Inc Rotary filter and method
US4097382A (en) * 1977-03-28 1978-06-27 The Black Clawson Company Dewatering screen
US4233159A (en) * 1977-11-28 1980-11-11 Toray Industries, Inc. Solid-liquid separation element and apparatus
US4680115A (en) * 1985-12-23 1987-07-14 Lavalley Industrial Plastics, Inc. Filtrate discharge accelerator system for center valve filter drums

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA476880A (fr) * 1951-09-11 G. Lesniak Frank Appareils a epaissir
US3241675A (en) * 1962-06-04 1966-03-22 Ajem Lab Inc Rotary filter and method
US4097382A (en) * 1977-03-28 1978-06-27 The Black Clawson Company Dewatering screen
US4233159A (en) * 1977-11-28 1980-11-11 Toray Industries, Inc. Solid-liquid separation element and apparatus
US4680115A (en) * 1985-12-23 1987-07-14 Lavalley Industrial Plastics, Inc. Filtrate discharge accelerator system for center valve filter drums

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