EP2819786B1 - Dispositif de séparation de composants flottants d'un liquide à purifier - Google Patents

Dispositif de séparation de composants flottants d'un liquide à purifier Download PDF

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Publication number
EP2819786B1
EP2819786B1 EP13710611.8A EP13710611A EP2819786B1 EP 2819786 B1 EP2819786 B1 EP 2819786B1 EP 13710611 A EP13710611 A EP 13710611A EP 2819786 B1 EP2819786 B1 EP 2819786B1
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European Patent Office
Prior art keywords
plates
flow
liquid
flow distribution
cross
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EP13710611.8A
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German (de)
English (en)
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EP2819786A1 (fr
Inventor
Jan Emanuel Gerardus LUPPENS
Paulus Berendina Gerardus GEESSINCK
Marcus Johannes Bernardus HOGENKAMP
Roelof Albert VELTHUIS
Marco André Moekardanoe
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Colubris Cleantech Bv
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Colubris Cleantech BV
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic

Definitions

  • the invention relates to a cross-flow separator device for separating out of a liquid for purifying floating components present in this liquid, comprising a container with at least one first inlet conduit on an upstream side for admitting liquid for purifying and at least one outlet conduit on a downstream side for discharging purified liquid, in which container a number of plates are placed mutually parallel at an acute angle relative to the horizontal for the purpose of allowing the liquid to flow between these plates in substantially horizontal flow direction while causing the floating components to be separated in upward direction along these plates, which device is provided with a number of mutually parallel partitions adjacently of the upper side of the plates and standing in transverse direction thereof.
  • US 3 837 501 A discloses a cross-flow separator in which a liquid flow for purifying is guided through an assembly of parallel inclining plates in transverse direction of these plates. Precipitating components settle here along the upper side of the respective plates and floating components are pushed upward along the underside of the respective plates and collected in a container which is connected via an overflow partition to a discharge duct, from which the components which have floated upward can be removed.
  • the known cross-flow separator is frequently and successfully applied to allow precipitating parts to settle.
  • counterflow separator In order to cause floating components to float use is generally made of a so-called flotation separator with a counterflow assembly, referred to simply as counterflow separator.
  • US 4 160 737 A discloses such a counter flow separator.
  • a liquid flow for purifying is guided here through an assembly of parallel inclining plates in downward inclining direction parallel to these plates, wherein floating components are pushed upward in counterflow along the underside of the respective plates, i.e. counter to the flow direction of the liquid flow for purifying.
  • the drawback of a counterflow separator is that, for a good purification (in this case separating) result, the required surface area of plates, and thereby the volume of the assembly of plates and the installation as a whole, is relatively large.
  • a flotation separator is difficult to transport from its production location, particularly by means of road transport, and takes up a great deal of space at its location of use.
  • WO 94/25136 A1 discloses a process for the treatment of a solution or aqueous emulsion of a given substance containing magnetizable particles in suspension, dispersed oil and dissolved air. It also discloses a device for carrying out said process.
  • FR 1 208 537 A discloses a device, apparatus and method for the separation, by flotation, of suspended matter in a liquid.
  • a cross-flow separator is in principle less voluminous than a counterflow separator, it has been found that the former is less suitable for allowing floating components to float because the purifying result thereof is unsatisfactory. Improving the purifying capacity of the known cross-flow separator such that a result is thereby achieved similar to that of the counterflow separator is possible by increasing the total surface area of plates, which however results in an unacceptably large volume of the overall device.
  • US 2010/0300990 A discloses a flotation apparatus for the separation of solid particles from a suspension with formation of a fraction lacking in solid particles and a fraction rich in solid particles comprises a tank with an inlet for the suspension, with an outlet for the fraction lacking in solid particles, with an outlet for the fraction rich in solid particles, and with at least one block of slats composed of multiple overlapping slats, wherein the at least one block of slats has a rear side oriented toward the tank wall and a front side arranged on the opposite side of the block of slats.
  • US 2009/0095672 A discloses a high efficiency grit removal system, which includes a tank having walls for holding fluid for separation of grit particles from the fluid, a fluid inlet for flow of fluid into the tank, a fluid outlet for flow of fluid from the tank, an inlet diffusion baffle assembly including a baffle positioned to direct fluid flow toward the tank walls and a lower chamber of the tank, and an outlet baffle assembly including a baffle positioned in a rear of the tank at an upward slope from the center of the tank toward the fluid outlet configured to direct fluid flow toward the center of the tank.
  • the at least one scraper preferably displaces the floating components in a direction opposite to the flow direction of the fluid.
  • the inlet conduit for the fluid debouches into the inlet conduit for the liquid for purifying.
  • a device according to the invention wherein the fluid to be admitted is a liquid comprising gas bubbles, is provided in an advantageous embodiment with means for providing the liquid comprising gas bubbles.
  • a flow distribution device is provided between the downstream end of the plates and the outlet conduit.
  • the flow distribution device is formed by a flow distribution plate extending substantially transversely of the plates and provided with a number of passage openings, wherein at least one of the passage openings in the flow distribution plate is at least partially closable.
  • a flow distribution plate in which one or more passage openings can be partially or fully closed provides the option of adapting this plate to the flow rate of the liquid for purifying, so optimizing the separating capacity.
  • the flow distribution plate is provided with at least one elongate opening bounded along two opposite parallel straight sides by upright edges, which upright edges are enclosed with precise fit by the legs of a U-profile extending over the respective elongate opening, wherein at least one pair of co-acting passage openings is provided in at least one upright edge and one of the legs.
  • the effective size of such a passage opening can be varied within determined limits in an embodiment in which such a U-profile is displaceable in a direction transversely of the flow distribution plate.
  • the flow distribution device is formed by a first system of first U-profiles extending parallel at a distance from each other and extending transversely of the flow direction of the liquid, wherein the legs of the first U-profiles are directed in flow direction of the liquid and are enclosed with loose fit by the legs of a second system of second U-profiles, wherein the spaces between the legs of the first and the second U-profiles form passage openings.
  • the size of these passage openings is for instance adjustable in that the first system of first U-profiles and the second system of second U-profiles are displaceable relative to each other in flow direction of the liquid.
  • the parallel plates are placed in at least two groups, wherein the plates of a first group are placed at a first mutual distance on the upstream side of the container, and the plates of a second group are placed at a second mutual distance, shorter than the first mutual distance, in downstream direction adjacently of the plates of the first group.
  • the discharge of separated components in the spaces between the plates on the upstream side of the container, adjacently of the inlet conduit, is enhanced, thereby preventing these spaces becoming clogged.
  • the liquid for purifying is guided between the plates of the second group, which are placed at a shorter distance from each other, whereby it is possible within a determined volume to realize a greater separating surface area, and so a greater separating capacity, without the risk of blockages.
  • the outlet conduit in a device comprises in an embodiment at least one tube, an open outer end of which extends in normal operating mode vertically upward through a determined, preferably adjustable height in the purified liquid.
  • the outlet conduit comprises at least one overflow gutter extending in normal operating mode horizontally in the purified liquid at a determined, preferably adjustable height.
  • the container is for instance provided on its underside with a collecting compartment for receiving precipitating components therein.
  • the device is preferably provided with a number of mutually parallel vertical partitions extending adjacently of the underside of the plates and in transverse direction thereof.
  • the plates in a device according to the invention are for instance flat plates.
  • the plates preferably have a zigzag or a crenellated profile, more preferably a corrugated profile.
  • floating components are guided upward along the underside of the peaks in the zigzag, crenellated or corrugated profile, and precipitating components are guided downward along the upper side of the plates through the valleys in the zigzag, crenellated or corrugated profile.
  • Fig. 1 shows a cross-flow separator 1 with a container 2 narrowing in downward direction and provided on one side (the upstream side 3) with an inlet conduit 4 for admitting a liquid contaminated with floating solid or liquid components such as oil or fat particles, the influent, for instance waste water, and with two inlet conduits 28 for admitting a fluid. Also shown is a third inlet conduit 28' for a fluid which debouches directly into the liquid inlet conduit 4.
  • the fluid inlet conduits 28, 28' are for instance connected to a device (not shown) using which a liquid is enriched with microscopically small gas bubbles with a diameter of for instance 10 to 30 ⁇ m.
  • the downstream side 5 opposite upstream side 3 is provided with two outlet openings (not shown) to which is connected an outlet conduit (not shown) for discharge of purified liquid, the effluent.
  • container 2 a number of corrugated plates 6, 6' are placed mutually parallel at an acute angle relative to the horizontal, wherein the mutual distance between plates 6 on upstream side 3 is greater than the mutual distance between plates 6' on downstream side 5.
  • a flow distribution plate 7 Arranged transversely of plates 6' between the downstream end of plates 6' and the outlet conduit is a flow distribution plate 7 provided with a number of passage openings (not shown).
  • Vertical partitions 8 are arranged adjacently of the upper side of plates 6, 6'.
  • Container 2 Present in the space between flow distribution plate 7 and the downstream side 5 of the container are two outlet tubes 9 which protrude vertically upward with their open outer end.
  • the underside of container 2 is formed by a collecting compartment 10 for collecting sediment.
  • Container 2 supports with four legs 11 on a floor or ground surface.
  • contaminated liquid is admitted via inlet opening 4, mixed with a gas-rich liquid flow supplied via conduits 28, 28' and guided between the inclining plates 6, 6' to downstream side 5.
  • the liquid flows here in horizontal direction between plates 6, 6' while being aerated from the underside of container 2, wherein floating components are separated out in upward direction along the underside of these plates 6, 6'.
  • the liquid for purifying between plates 6, 6' is guided in purified state on the downstream side via flow distribution plate 7 to the vertical outlet tubes 9, the upper open end of which precisely determines the level of the liquid in container 2.
  • Using vertical partitions 8 prevents a short-circuit flow occurring.
  • Partitions 8 moreover form spaces in which moisture can further be removed from the floating components, so that after a time a floating layer is formed with a high content of dry substance which can be scraped off using scrapers 29 which are displaceable above partitions 8 and are attached to chains 30 driven by an electric motor 31.
  • Precipitating components are collected on the underside in collecting compartment 10, wherein using the vertical partitions 14 on the underside (shown in fig. 2 ) prevents a short-circuit flow occurring.
  • Collecting container 10 is provided with a conveyor screw (not shown) and is opened at set times for the purpose of discharging collected sediment.
  • Fig. 2 shows the interior 12 of the cross-flow separator 1 shown in fig. 1 .
  • Plates 6, 6' are coupled to each other to form so-called plate assemblies using threaded rods and spacing sleeves (not shown).
  • the figure shows a number of passage openings 13 in flow distribution plate 7 and a number of vertical partitions 14 adjacently of the underside of plates 6, 6'.
  • Fig. 3 shows in detail the flow distribution plate 7 of the cross-flow separator shown in fig. 1 .
  • Four square passage openings 13 are shown which can be wholly or partially closed independently of each other using covers 15 coupled to pull rods 17 movable in the direction of arrows 16.
  • Fig. 4 shows a flow distribution plate 18 with three rectangular elongate openings 27, each bounded along two opposite sides by upright edges 19, which are enclosed with precise fit by legs 20 of a U-profile 21.
  • U-profiles 21 are displaceable using an operating mechanism (not shown) in a direction as according to arrow 22 transversely of the flow distribution plate 18.
  • Co-acting rectangular passage openings 13, 13' are formed in edges 19 and legs 20 in a manner such that they do not overlap each other in a situation where the relevant U-profile 21 is pressed against the flow distribution plate 18 (the outer U-profiles 21 in the figure), and passage openings 13, 13' wholly overlap each other in a situation where the relevant U-profile 21 is removed a maximum distance from the flow distribution plate 18 (the middle U-profile 21 in the figure), so that elongate openings 27 can be made accessible to greater or lesser extent. Shown is a situation in which the middle elongate opening 13 is maximally accessible, and the two outer elongate openings 27 are not accessible.
  • Fig. 5 shows flow distribution device 23 with a first system of mutually parallel U-profiles 24 extending transversely of the flow direction of the liquid, wherein the legs of the first U-profiles 24 are directed in the flow direction of the liquid and are enclosed with loose fit by the legs of a second system of U-profiles 25, wherein the spaces between the legs of the first 24 and the second U-profiles 25 form passage openings.
  • Fig. 6 shows the flow distribution device 23 of fig. 5 in a cross-section along line VI-VI in fig. 5 .
  • the first system of U-profiles 24 and the second system of U-profiles 25 are displaceable relative to each other (indicated by arrow 22) in flow direction of the liquid by means of an operating mechanism so that the size of the formed passage openings can be set within determined limits.
  • Arrows 26 indicate the path of the purified liquid through the flow distribution device 23.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Physical Water Treatments (AREA)

Claims (8)

  1. Séparateur à flux transversal (1) pour séparer d'un liquide à purifier des composants flottants présents dans ce liquide, comprenant un récipient (2) pourvu d'au moins un premier conduit d'entrée (4) sur un côté amont (3) pour admettre du liquide à purifier et au moins un conduit de sortie (9) sur un côté aval (5) pour évacuer le liquide purifié, dans lequel récipient (2) un certain nombre de plaques (6, 6') sont placées mutuellement en parallèle à un angle aigu par rapport à l'horizontale dans le but de permettre au liquide de s'écouler entre ces plaques (6, 6') dans une direction d'écoulement sensiblement horizontale tout en amenant les composants flottants à être séparés dans une direction vers le haut le long de ces plaques (6, 6'), lequel séparateur à flux transversal (1) est pourvu d'un certain nombre de cloisons (8) mutuellement parallèles adjacentes au côté supérieur des plaques (6, 6') et se tenant dans une direction transversale de celles-ci, caractérisé en ce que
    il est pourvu d'un second conduit d'entrée (28, 28') pour admettre un fluide, dans lequel le fluide à admettre est un liquide comprenant des bulles de gaz et le dispositif (1) est pourvu d'un moyen pour fournir le liquide comprenant des bulles de gaz, le second conduit d'entrée (28, 28') étant positionné de manière appropriée sur le côté amont (3) pour réaliser un effet de flottation, et
    en ce qu'il est pourvu d'au moins un racloir (29) pouvant se déplacer au-dessus des cloisons (8) pour racler les composants flottants séparés ; et en ce que
    un dispositif de distribution d'écoulement (7, 18, 23) est disposé entre l'extrémité aval des plaques (6, 6') et le conduit de sortie (9),
    dans lequel
    1) le dispositif de distribution d'écoulement (7, 18) est formé par une plaque de distribution d'écoulement s'étendant de manière sensiblement transversale aux plaques (6, 6') et pourvue d'un certain nombre d'ouvertures de passage (13),
    dans lequel au moins l'une des ouvertures de passage (13) peut être au moins partiellement fermée, dans lequel la plaque de distribution d'écoulement (7) est pourvue de couvercles (15) couplés à des bielles (17) mobiles dans une direction verticale (16) pour permettre aux ouvertures (13) d'être entièrement ou partiellement fermées indépendamment les unes des autres ; ou
    2) le dispositif de distribution d'écoulement (7, 18) est formé par une plaque de distribution d'écoulement s'étendant de manière sensiblement transversale aux plaques (6, 6') et pourvue d'un certain nombre d'ouvertures de passage (13),
    dans lequel au moins l'une des ouvertures de passage (13) peut être au moins partiellement fermée,
    dans lequel la plaque de distribution d'écoulement (18) est pourvue d'au moins une ouverture allongée (27) délimitée le long de deux côtés droits parallèles opposés par des bords montants (19), lesquels bords montants (19) sont enfermés avec un ajustement précis par les jambes (20) d'un profilé en U (21) s'étendant par-dessus l'ouverture allongée (27) respective, dans lequel au moins une paire d'ouvertures de passage (13, 13') coopérantes est disposée dans au moins un bord montant (19) et l'une des jambes (20),
    dans lequel le profilé en U (21) peut être déplacé à l'aide d'un mécanisme d'actionnement dans une direction (22) transversalement à la plaque de distribution d'écoulement (18), et
    lesdites ouvertures de passage (13, 13') coopérantes sont formées dans lesdits bords (19) et jambes (20) d'une manière telle qu'elles ne se chevauchent pas dans une situation où le profilé en U (21) concerné est pressé contre la plaque de distribution d'écoulement (18), et les ouvertures de passage (13, 13') se chevauchent entièrement dans une situation où le profilé en U (21) concerné est retiré à une distance maximale de la plaque de distribution d'écoulement (18), de telle sorte que les ouvertures allongées (27) peuvent être rendues accessibles dans une plus ou moins grande mesure ; ou
    3) le dispositif de distribution d'écoulement (23) est formé par un premier système de premiers profilés en U (24) s'étendant en parallèle à une distance les uns des autres et s'étendant transversalement à la direction d'écoulement du liquide, dans lequel les jambes des premiers profilés en U (24) sont dirigées dans une direction d'écoulement du liquide et sont enfermées avec un ajustement lâche par les jambes d'un second système de seconds profilés en U (25), dans lequel les espaces entre les jambes des premiers (24) et des seconds (25) profilés en U forment des ouvertures de passage,
    dans lequel le premier système de premiers profilés en U (24) et le second système de seconds profilés en U (25) peuvent être déplacés l'un par rapport à l'autre dans la direction d'écoulement (22) du liquide au moyen d'un mécanisme d'actionnement de telle sorte que la taille des ouvertures de passage formées peut être réglée dans des limites déterminées.
  2. Séparateur à flux transversal (1) selon la revendication 1, caractérisé en ce que l'au moins un racloir (29) est conçu pour déplacer les composants flottants dans une direction opposée à la direction d'écoulement du fluide.
  3. Séparateur à flux transversal (1) selon l'une quelconque des revendications 1-2, caractérisé en ce que l'au moins un racloir (29) peut être déplacé au-dessus des cloisons (8) et est fixé à des chaînes (30) entraînées par un moteur électrique (31).
  4. Séparateur à flux transversal (1) selon l'une quelconque des revendications 1-3, caractérisé en ce que le second conduit d'entrée (28') pour le fluide débouche dans le conduit d'entrée (4) pour le liquide à purifier.
  5. Séparateur à flux transversal (1) selon l'une quelconque des revendications 1-4, caractérisé en ce que les plaques (6, 6') sont placées dans au moins deux groupes, dans lequel les plaques (6) d'un premier groupe sont placées à une première distance mutuelle sur le côté amont (3) du récipient, et les plaques (6') d'un second groupe sont placées à une seconde distance mutuelle, plus courte que la première distance mutuelle, dans la direction aval de manière adjacente aux plaques (6) du premier groupe.
  6. Séparateur à flux transversal (1) selon l'une quelconque des revendications 1-5, caractérisé en ce que le conduit de sortie comprend au moins un tube (9), dont une extrémité extérieure s'étend en mode de fonctionnement normal verticalement vers le haut sur une hauteur déterminée dans le liquide purifié.
  7. Séparateur à flux transversal (1) selon l'une quelconque des revendications 1-5, caractérisé en ce que le conduit de sortie comprend au moins une gouttière de débordement s'étendant en mode de fonctionnement normal horizontalement à une hauteur déterminée dans le liquide purifié.
  8. Séparateur à flux transversal (1) selon l'une quelconque des revendications 1-7, caractérisé en ce qu'il est pourvu d'un certain nombre de cloisons verticales (14) mutuellement parallèles s'étendant de manière adjacente au dessous des plaques (6, 6') et dans une direction transversale de celles-ci.
EP13710611.8A 2012-02-29 2013-02-27 Dispositif de séparation de composants flottants d'un liquide à purifier Active EP2819786B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2008384A NL2008384C2 (nl) 2012-02-29 2012-02-29 Inrichting voor het uit een te zuiveren vloeistof afscheiden van opdrijfbare bestanddelen.
PCT/NL2013/050118 WO2013129922A1 (fr) 2012-02-29 2013-02-27 Dispositif de séparation de composants flottants d'un liquide à purifier

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EP2819786A1 EP2819786A1 (fr) 2015-01-07
EP2819786B1 true EP2819786B1 (fr) 2022-07-20

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2023560B1 (en) 2019-07-24 2021-02-10 Colubris Cleantech B V Method and system for cleaning an aqueous liquid containing contaminants

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1208537A (fr) * 1958-06-18 1960-02-24 Dispositif, appareillage et procédé pour la séparation, par flottation, de matières en suspension dans un liquide
WO1994025136A1 (fr) * 1993-04-24 1994-11-10 Leduc Procede et dispositif d'epuration d'une solution ou emulsion aqueuse d'une substance determinee

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7001713A (fr) * 1970-02-06 1971-08-10 Pielkenrood Vinitex Bv
US4160737A (en) * 1973-12-22 1979-07-10 Pielkenrood-Vinitex B.V. Flotation and plate separation device
DE102007020029A1 (de) * 2007-04-27 2008-10-30 Meri Entsorgungstechnik für die Papierindustrie GmbH Flotationsvorrichtung mit Lochplatte
US7824549B2 (en) * 2007-10-10 2010-11-02 Wsg & Solutions, Inc. High efficiency grit removal system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1208537A (fr) * 1958-06-18 1960-02-24 Dispositif, appareillage et procédé pour la séparation, par flottation, de matières en suspension dans un liquide
WO1994025136A1 (fr) * 1993-04-24 1994-11-10 Leduc Procede et dispositif d'epuration d'une solution ou emulsion aqueuse d'une substance determinee

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WO2013129922A1 (fr) 2013-09-06
NL2008384C2 (nl) 2013-09-02

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