EP2582464A2 - Arrangement for separating floating solid particles and/or solid fibers from solid-liquid mixtures by means of flotation - Google Patents

Arrangement for separating floating solid particles and/or solid fibers from solid-liquid mixtures by means of flotation

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Publication number
EP2582464A2
EP2582464A2 EP11755240.6A EP11755240A EP2582464A2 EP 2582464 A2 EP2582464 A2 EP 2582464A2 EP 11755240 A EP11755240 A EP 11755240A EP 2582464 A2 EP2582464 A2 EP 2582464A2
Authority
EP
European Patent Office
Prior art keywords
solid
diffuser
liquid
flotation
air
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP11755240.6A
Other languages
German (de)
French (fr)
Inventor
Juan Valdivia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RITHCO Papertec GmbH
Original Assignee
Juan Valdivia GmbH
RITHCO PAPERTEC GmbH
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 Juan Valdivia GmbH, RITHCO PAPERTEC GmbH filed Critical Juan Valdivia GmbH
Publication of EP2582464A2 publication Critical patent/EP2582464A2/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B01F23/2326—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles adding the flowing main component by suction means, e.g. using an ejector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • 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
    • B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream

Definitions

  • the invention relates to an arrangement for the separation of suspended solid ⁇ particles and / or solid fibers from solid-liquid mixtures by flotation. It can be used in flotation plants for wastewater treatment, in deinking plants or in water treatment in papermaking or paper recycling.
  • a device for carrying out a procedural ⁇ proceedings for treating sludge in DE 42 01 913 A1, having such a compres sor ⁇ for introducing air into the liquid to be fumigated having such a compres sor ⁇ for introducing air into the liquid to be fumigated.
  • DE 41 26397 A1 a device for generating foam is described, in which the air is injected into a mixing chamber of a foam generator by means of a controllable in its performance compressor.
  • the mixing chamber in this case has a porous mixing chamber wall, through which the air supplied by the compressor is introduced into the fluid flowing behind the porous mixing chamber wall to be foamed fluid in a uniform distribution.
  • US 4844873 A a plant for the separation and recovery of solids from a solid-liquid mixture by ionization flotation is described.
  • This plant comprises a clarifier into which the solid liquid ⁇ keits mixture is introduced on the bottom side and foamed by the introduction of air bubbles.
  • the solids bearing foam accumulating at the upper edge of the container is suitably removed from the clarifier while the solids liberated liquid is collected in a reservoir.
  • the generation of the air bubbles necessary for the flotation process takes place in a venturi arrangement according to Venturi, as described for example in French patent application FR 2484862 A1.
  • the diffuser assembly is located directly in the feed line of the solids-carrying liquid into the clarifier and is fed by this liquid with admixture of a portion of recovered solids-liberated liquid and atmospheric air.
  • the blistering is thus predominantly in the range of the solid-liquid mixture in the inlet of the clarifier.
  • the object is to develop an arrangement with which the required air bubble formation can be achieved wear within the loaded liquid with solids, which requires no compressors, fans or air pumps and therefore significantly reduced requires equipment and, above all, a reduced energy consumption.
  • This object of the invention is achieved with an arrangement which has the features of the 1. Claim comprises.
  • the subclaim contains an advantageous embodiment of the invention.
  • the essence of the invention is that in the arrangement for the separation of suspended solids particles and / or solid fibers from solid-liquid mixtures instead of energy and maintenance-consuming compressors, blowers or pumps for air bubble generation, a diffuser is arranged, by means of which with low energy consumption Aspirating air into a partial stream of the liquid to be treated, the required air bubbles are generated, which is then introduced into the inlet of the container for the main process of liquid treatment.
  • the air bubble generating diffuser is arranged so that it is not flowed through by the solid-liquid mixture, but that the bubble-forming injection process takes place exclusively in the flow area already frestofffrereiter recovered liquid.
  • a substantially improved flotation effect in the sewage treatment or process vessel can be achieved by feeding an air bubble-liquid mixture produced using solids-freed reclaimed liquid into the solid-liquid mixture.
  • the bubble generation in a solids-freed recovered liquid causes the flotation process a much larger amount of significantly smaller air bubbles is supplied.
  • the bubble size can be significantly better controlled in such a bubble generation and driven into the area of the so-called microbubbles of about 0.001 mm bubble diameter. Flotation foams from such microbubbles are much more stable and more active and effective in their solids-binding properties and their transportability.
  • Adhesion and transport capacity for the solid particles and / or solid fibers have therefore proved less suitable for the flotation process for the separation of suspended solid particles or solid fibers from solid-liquid mixtures.
  • their production in the solids-laden The liquid region is much more energy-consuming than the microbubble generation in the flow area already freed liquid reclaimed liquid.
  • Figure 1 a schematic diagram of a flotation plant for wastewater treatment according to the prior art and in
  • Figure 2 a schematic diagram of a flotation plant for wastewater treatment according to the invention.
  • a known flotation plant of the prior art has a main process vessel 1 into which wastewater laden with solid particles and / or solid fibers to be cleaned with the feed line 2 is introduced. So that the desired flotation effect can be achieved in the main process vessel 1, the incoming wastewater laden with solid particles and / or solid fibers is foamed by means of air bubble introduction.
  • the flotation plant for wastewater treatment according to the prior art has an air mixing tank 3 in which compressed compressed air is mixed with water from a clear water tank 4 in the course of the main process tank 1 by a high-pressure compressor, not shown, and then the feed line 2 is supplied.
  • a flotation plant according to the invention likewise has a main process vessel 1, into which wastewater laden with solid particles and / or solid fibers to be cleaned with the feed line 2 is introduced. So that the desired flotation effect can be achieved in Hauptreabehalter 1, the incoming wastewater laden with solid particles and / or solid fibers is also foamed by means of air bubble introduction.
  • a diffusion Sor 5 arranged, namely within a line return 6 from the drain line of the main process vessel 1, which leads the liberated from the solid particles and / or solid fibers wastewater as clear water to the feed line 2 of the laden with solid particles and / or solid fibers wastewater.
  • the diffuser 5 is used to generate the air bubbles already qualified for flotation, in which it sucks in air through its body through the air supply opening when flowing through the separated liquid portion of the clear water and adds air bubbles to the liquid portion of the clear water in this way.
  • the outlet of the diffuser 5 is connected to the already mentioned feed line 2 of the main process vessel 1 in such a way that the resulting air bubbles are introduced into the feed stream 2 of the waste water loaded with solid particles and / or solid fibers in the feed stream 2.
  • the exemplary embodiment according to FIGS. 1 and 2 has the following operating data by way of example:
  • the aeration data of the flotation plant of the prior art prior to the use of the arrangement according to the invention amounted to:
  • the inlet to wastewater to the flotation plant is 12,000 l / min.
  • a partial flow of the freed from the solid particles and / or solid fibers wastewater - also referred to as purified filtrate - of 2400 l / min - d. H. 20% of the treated flow rate - needed.
  • This amount is pressed with a pump 7 with a capacity of 150 kW at a pressure of 1 bar in the air mixing tank 3 and mixed with incoming compressed air of 10 bar.
  • the flowing purified filtrate in the air mixing tank 3 absorbs air in a ratio of 1: 1.
  • the inventive arrangement shown in Figure 2 has the following Bacpara ⁇ meter: From the filtrate 8, a partial stream of freed from the solid particles and / or solid fibers wastewater of 500 l / min to the inlet of the diffuser 5, After the diffuser 5 is this partial flow is introduced into the supply line 2 to the flotation plant. With the diffuser 5 is at a flow rate of 500 l / min freed of the solid particles and / or solid fibers Abwas ⁇ sers and at least 1, 5 bar differential pressure an air intake of 5000 l / min reached. The inlet pressure in the diffuser inlet is 2 bar. With this pressure, the diffuser consumes only 3.5 kW of installed electrical power at a flow rate of 500 l / min. The theoretical energy saving over the arrangement of the prior art shown in Figure 1 is 98% and can be approximately achieved in practice.
  • an exemplary arrangement has been described in an example ⁇ haften application.
  • the invention includes all other arrangements with under defenceiichen process apparatuses in which by means of the inventive arrangement of a diffuser, an air bubble generation in liquids to be treated is made waiving compressors, blowers and pumps.
  • the arrangement of a diffuser in the flow area of a freed from the Feststoffparti- and / or solid fibers wastewater can be used in all physical processes in which air fractions are required in liquids, such as in the flotation of solid-liquid mixtures, the aeration of waste water or the mud conditioning.
  • very large energy savings can be achieved in which it is possible to dispense with compressors, blowers and pumps. In most cases, energy savings of more than 90% are conceivable and realistic.
  • By a uniform dispersion of the air bubbles generated with the diffuser 5 and an injection of chemicals in the air intake of the diffuser 5 is possible. In such applications, considerable reductions in the consumption of chemicals are achieved.
  • the arrangement of the invention for the separation of suspended solid particles and / or solid fibers of solid-liquid ⁇ keits mixtures can be used by flotation in paper production, in particular in the flotation water treatment in circuits of Flotati ⁇ onsanlagen and deinking plants.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biotechnology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Physical Water Treatments (AREA)
  • Paper (AREA)

Abstract

The invention relates to an arrangement for separating floating solid particles and/or solid fibers from solid-liquid mixtures by means of flotation. The arrangement comprises a main process container (1), into which the solid-liquid mixture to be separated is introduced by means of a supply line (2), to which the air bubbles required to implement the flotation process are supplied. In order to produce said air bubbles, a diffuser (5) is present according to the invention, into the inlet of which a part of the liquid discharged from the main process container (1) is conducted and the nozzle arrangement of which has an air supply opening. The outlet of the diffuser is connected to the supply line (2) of the main process container (1) in such a way that the air bubbles, which are produced in the diffuser (5) from the intake of air into the part of the already treated liquid that is conducted through the diffuser (5), are introduced into the supply flow of the solid-liquid mixture to be treated.

Description

Anordnung zur Abtrennung von schwebenden Feststoff Partikeln und/oder Feststofffasern aus Feststoff-Flüssigkeits-Gemischen durch Flotation  Arrangement for the separation of suspended solid particles and / or solid fibers from solid-liquid mixtures by flotation
Die Erfindung betrifft eine Anordnung zur Abtrennung von schwebenden Feststoff¬ partikeln und/oder Feststofffasern aus Feststoff-Flüssigkeits-Gemischen durch Flotation. Sie kann Anwendung finden in Flotationsanlagen zur Abwasserbehandlung, in Deinkinganlagen oder in der Wasseraufbereitung bei der Papierherstellung oder dem Papierrecycling. The invention relates to an arrangement for the separation of suspended solid ¬ particles and / or solid fibers from solid-liquid mixtures by flotation. It can be used in flotation plants for wastewater treatment, in deinking plants or in water treatment in papermaking or paper recycling.
Zur Durchführung der Flotationsprozesse ist es üblich, Luftblasen in das zu flotieren- de Feststoff-Flüssigkeits-Gemisch einzubringen, an denen die schwebenden Feststoffe oder Fasern anhaften und so an die Oberfläche des Flotationsvolumens getragen werden. To carry out the flotation processes, it is customary to introduce air bubbles into the solid-liquid mixture to be floated, to which the suspended solids or fibers adhere and are thus carried to the surface of the flotation volume.
Aus bekannten Lösungen der vorgenannten Anwendungsgebiete sind bereits eine Reihe von Anordnungen offenbart, die sich in der Regel dadurch auszeichnen, dass mittels Kompressoren hoher Leistung Luft unter hohem Druck in Behälter und Leitungen gepresst wird, die die zu begasende Flüssigkeit enthalten. From known solutions of the aforementioned fields of application, a number of arrangements are already disclosed, which are generally distinguished by the fact that high pressure compressors are used to press air under high pressure into containers and lines containing the liquid to be fumigated.
So wird z.B. in der DE 42 01 913 A1 eine Einrichtung zur Durchführung eines Verfah¬ rens zum Aufbereiten von Schlämmen vorgeschlagen, die einen solchen Kompres¬ sor zur Einleitung von Luft in die zu begasende Flüssigkeit aufweist. In der DE 41 26397 A1 ist eine Vorrichtung zur Schaumerzeugung beschrieben, in der die Lufteinblasung in eine Mischkammer eines Schaumgenerators mittels eines in seiner Leistung steuerbaren Kompressors erfolgt. Die Mischkammer weist dabei eine poröse Mischkammerwand auf, durch die die vom Kompressor gelieferte Luft in das hinter der porösen Mischkammerwand fließende aufzuschäumende Fluid in gleichmäßiger Verteilung eingeleitet wird. For example, it is proposed a device for carrying out a procedural ¬ proceedings for treating sludge in DE 42 01 913 A1, having such a compres sor ¬ for introducing air into the liquid to be fumigated. In DE 41 26397 A1 a device for generating foam is described, in which the air is injected into a mixing chamber of a foam generator by means of a controllable in its performance compressor. The mixing chamber in this case has a porous mixing chamber wall, through which the air supplied by the compressor is introduced into the fluid flowing behind the porous mixing chamber wall to be foamed fluid in a uniform distribution.
Ebenso werden in der Vorrichtung zum Einpressen von Gasen in eine Flüssigkeit nach der DE 10251923 A1 die Gasblasen mittels hohem Druck erzeugt, indem der das zu begasende Fluid fördernden Pumpe zur Druckerhöhung eine Mischpumpe nachgeschaitet wird und die gasbeaufschlagte Flüssigkeit diese Mischpumpe über einen Beipaß mehrfach durchströmt, bevor sie der Entspannung im Kavitationsfeld eines Mikroblasenbildners zugeleitet wird. Ein wesentlicher Nachteil der vorgenannten Lösungen des Standes der Technik, die zum Einpressen der Luft in die Flüssigkeit Kompressoren, Gebläse und Pumpen benutzen, ist ein hoher Energieaufwand, den der Betrieb solcher Aggregate erfordert. Hinzu kommt ein nicht unerheblicher Verschleiß, dem diese schnell laufenden Rotationsmaschinen unterliegen und der zu laufenden hohen Wartungs- und Reparaturkosten führt. Likewise, in the apparatus for injecting gases into a liquid according to DE 10251923 A1, the gas bubbles are generated by high pressure by the pump to be fumigant pump for pressure increase a mixing pump is nachgeschaitet and the gasbeaufschlagte liquid flows through this mixing pump via a Beipaß several times, before it is sent to relaxation in the cavitation field of a microbulker. A major disadvantage of the aforementioned solutions of the prior art, which use compressors, blowers and pumps to inject the air into the liquid, is a high expenditure of energy, which requires the operation of such aggregates. In addition, there is a considerable amount of wear, which these fast-running rotary machines are subject to and which leads to ongoing high maintenance and repair costs.
In der US 4844873 A ist eine Anlage zur Trennung und Wiedergewinnung von Feststoffen aus einem Feststoff-Flüssigkeits-Gemisch durch lonisations-Flotation beschrieben . Diese Anlage umfasst einen Klärbehälter, in den das Feststoff-Flüssig¬ keits-Gemisch bodenseitig eingeführt und durch die Einleitung von Luftblasen aufgeschäumt wird. Der sich am oberen Behälterrand ansammelnde, den Feststoff tragende Schaum wird auf geeignete Weise aus dem Klärbehälter entfernt, während die feststoffbefreite Flüssigkeit in einem Reservoir gesammelt wird. Die Erzeugung der für den Flotationsprozess notwendigen Luftblasen erfolgt in einer Diffusoranord- nung nach Venturi, wie sie beispielsweise in der französischen Offenlegungsschrift FR 2484862 A1 beschrieben ist. Die Diffusoranordnung befindet sich direkt in der Zuführungsleitung der feststoffführenden Flüssigkeit in den Klärbehälter und wird gespeist durch diese Flüssigkeit unter Beimischung eines Anteils rückgewonnener feststoffbefreiter Flüssigkeit sowie durch Atmosphärenluft. Die Blasenbildung erfolgt also überwiegend im Bereich des Feststoff-Flüssigkeits-Gemisches im Zulauf des Klärbehälters. In US 4844873 A a plant for the separation and recovery of solids from a solid-liquid mixture by ionization flotation is described. This plant comprises a clarifier into which the solid liquid ¬ keits mixture is introduced on the bottom side and foamed by the introduction of air bubbles. The solids bearing foam accumulating at the upper edge of the container is suitably removed from the clarifier while the solids liberated liquid is collected in a reservoir. The generation of the air bubbles necessary for the flotation process takes place in a venturi arrangement according to Venturi, as described for example in French patent application FR 2484862 A1. The diffuser assembly is located directly in the feed line of the solids-carrying liquid into the clarifier and is fed by this liquid with admixture of a portion of recovered solids-liberated liquid and atmospheric air. The blistering is thus predominantly in the range of the solid-liquid mixture in the inlet of the clarifier.
Eine solche Anordnung des Diffusors führt einerseits zu einem starken Verschleiß der Diffusoranordnung durch die in dem Feststoff-Flüssigkeits-Gemisch enthaltenen Feststoffe und deren abrasiver Wirkung auf die Wände der Düsenkammern der Diffusoranordnung. Zusätzlich erfordert die injektive Luftblasenerzeugung in einer Diffusoranordnung nach Venturi bei einem nicht vernachlässigbaren Feststoffanteil auch einen deutlich höheren Energieaufwand, um das Feststoff-Flüssigkeits- Gemisch durch die Venturi-Anordnung zu befördern.  Such an arrangement of the diffuser leads on the one hand to a strong wear of the diffuser assembly by the solids contained in the solid-liquid mixture and their abrasive effect on the walls of the nozzle chambers of the diffuser assembly. In addition, injective air bubble generation in a venturi diffuser assembly, with a non-negligible solids content, also requires significantly more energy to carry the solid-liquid mixture through the venturi assembly.
Aus den genannten Nachteilen der Lösungen des Standes der Technik ergibt sich die Aufgabe, eine Anordnung zu entwickeln, mit der die benötigte Luftblasenbildung innerhalb der mit Feststoffen belasteten Flüssigkeit verschleißarm erreicht werden kann, die dazu keine Kompressoren, Gebläse oder Luftpumpen benötigt und daher einen deutlich verringerten gerätetechnischen Aufwand und vor allem auch einen verringerten Energieaufwand erfordert. Diese Aufgabe der Erfindung wird mit einer Anordnung gelöst, die die Merkmale des 1 . Patentanspruches umfasst. Der Unteranspruch enthält eine vorteilhafte Ausgestaltung der Erfindung. Das Wesen der Erfindung besteht darin, dass in der Anordnung zur Abtrennung von schwebenden Feststoff Partikeln und/oder Feststofffasern aus Feststoff-Flüssigkeits-Gemischen anstelle energie- und wartungsaufwändiger Kompressoren, Gebläse oder Pumpen zur Luftblasenerzeugung ein Diffusor angeordnet ist, mittels dessen mit geringem Energieaufwand durch Einsaugen von Luft in einen Teilstrom der zu behandelnden Flüssigkeit die benötigten Luftblasen erzeugt werden, welcher anschließend in den Zulauf des Behälters für den Hauptprozess der Flüssigkeitsbehandlung eingeleitet wird. From the mentioned disadvantages of the solutions of the prior art, the object is to develop an arrangement with which the required air bubble formation can be achieved wear within the loaded liquid with solids, which requires no compressors, fans or air pumps and therefore significantly reduced requires equipment and, above all, a reduced energy consumption. This object of the invention is achieved with an arrangement which has the features of the 1. Claim comprises. The subclaim contains an advantageous embodiment of the invention. The essence of the invention is that in the arrangement for the separation of suspended solids particles and / or solid fibers from solid-liquid mixtures instead of energy and maintenance-consuming compressors, blowers or pumps for air bubble generation, a diffuser is arranged, by means of which with low energy consumption Aspirating air into a partial stream of the liquid to be treated, the required air bubbles are generated, which is then introduced into the inlet of the container for the main process of liquid treatment.
Der die Luftblasen erzeugende Diffusor ist dabei so angeordnet, dass er nicht vom Feststoff-Flüssigkeits-Gemisch durchströmt wird, sondern dass der blasenbildende Injektionsvorgang ausschließlich im Strömungsbereich bereits feststoffbefreiter rückgewonnener Flüssigkeit stattfindet. The air bubble generating diffuser is arranged so that it is not flowed through by the solid-liquid mixture, but that the bubble-forming injection process takes place exclusively in the flow area already frestofffrereiter recovered liquid.
Überraschenderweise kann durch die Zuführung eines unter Nutzung feststoffbefrei- ter rückgewonnener Flüssigkeit erzeugten Luftblasen-Flüssigkeits-Gemisches in das Feststoff-Flüssigkeits-Gemisch eine wesentlich verbesserte Flotationswirkung im Klär- oder Prozessbehälter erreicht werden. Die Blasenerzeugung in einer feststoffbefreiten rückgewonnenen Flüssigkeit führt dazu, dass dem Flotationsvorgang eine wesentlich größere Menge deutlich kleinerer Luftblasen zugeführt wird. Die Blasengröße kann bei einer solchen Blasenerzeugung deutlich besser gesteuert und bis in den Bereich der sogenannten Microbläschen von etwa 0,001 mm Blasendurchmesser getrieben werden. Flotationsschäume aus solchen Mikroblasen sind wesentlich stabiler und in ihren feststoffbindenden Eigenschaften und ihrem Transportvermögen aktiver und effektiver. Sie bewirken die Austragung deutlich größerer Anteile an Feststoff Partikeln und/oder Feststofffasern aus dem durch Flotation zu trennenden Feststoff-Flüssigkeits-Gemisch als dies durch größere, instabile Blasen möglich ist, wie sie bei der Luftinjektion mit Diffusoren im feststoffbelasteten Flüssigkeitsbereich entstehen. Diese großen Blasen weisen ein deutlich geringeres Surprisingly, a substantially improved flotation effect in the sewage treatment or process vessel can be achieved by feeding an air bubble-liquid mixture produced using solids-freed reclaimed liquid into the solid-liquid mixture. The bubble generation in a solids-freed recovered liquid causes the flotation process a much larger amount of significantly smaller air bubbles is supplied. The bubble size can be significantly better controlled in such a bubble generation and driven into the area of the so-called microbubbles of about 0.001 mm bubble diameter. Flotation foams from such microbubbles are much more stable and more active and effective in their solids-binding properties and their transportability. They cause the discharge of significantly larger proportions of solid particles and / or solid fibers from the flotation to be separated solid-liquid mixture than is possible by larger, unstable bubbles, such as those produced in the air injection with diffusers in the solids-laden liquid area. These big bubbles have a much lower
Haftungs- und Transportvermögen für die Feststoffpartikel und/oder Feststofffasern auf. Sie haben sich daher für den Flotationsprozess zur Abtrennung von schwebenden Feststoff Partikeln oder Feststofffasern aus Feststoff-Flüssigkeits-Gemischen als weniger geeignet erwiesen. Hinzu kommt, dass ihre Erzeugung im feststoffbelaste- ten Flüssigkeitsbereich deutlich energieaufwändiger als die Microblasenerzeugung im Strömungsbereich bereits feststoffbefreiter rückgewonnener Flüssigkeit ist. Adhesion and transport capacity for the solid particles and / or solid fibers. They have therefore proved less suitable for the flotation process for the separation of suspended solid particles or solid fibers from solid-liquid mixtures. In addition, their production in the solids-laden The liquid region is much more energy-consuming than the microbubble generation in the flow area already freed liquid reclaimed liquid.
Es zeigte sich bei Versuchen, bei denen Luftblasen in Frischwasser injiziert wurden, dass dabei der Flotationseffekt eine erheblich größere Wirkung aufwies. Aus Kostengründen wird jedoch in der Praxis meist eine Luftblasenerzeugung in feststoffbefreiter rückgewonnener Flüssigkeit Anwendung finden, wobei aber durch die erfindungsgemäße Anordnung des Dtffusors zur Luftblasenerzeugung in feststoff befrei¬ ter rückgewonnener Flüssigkeit ein der Erzeugung von Luftblasen in Frischwasser nahekommendes Prozessergebnis erzielt werden kann. It was found in experiments in which air bubbles were injected into fresh water, that while the flotation effect had a significantly greater effect. For cost reasons, however, an air bubble generation in solids-freed reclaimed liquid will usually find application in practice, but by the inventive arrangement of the Dtffusors for producing air bubbles in solid liberated ¬ ter recovered liquid a production of air bubbles in fresh water approaching process result can be achieved.
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. The invention will be explained in more detail with reference to an exemplary embodiment.
Dabei zeigen die zugehörigen Zeichnungen in  The accompanying drawings show in FIG
Figur 1 : ein Prinzipschema einer Flotationsanlage zur Abwasserbehandlung nach dem Stand der Technik und in Figure 1: a schematic diagram of a flotation plant for wastewater treatment according to the prior art and in
Figur 2: ein Prinzipschema einer Flotationsanlage zur Abwasserbehandlung gemäß der Erfindung.  Figure 2: a schematic diagram of a flotation plant for wastewater treatment according to the invention.
Wie in Figur 1 gezeigt, weist eine bekannte Flotationsanlage des Standes der Technik einen Hauptprozessbehalter 1 auf, in den mit der Zulaufleitung 2 zu reinigendes mit Feststoff Partikeln und/oder Feststofffasern beladenes Abwasser eingeleitet wird. Damit die erwünschte Flotationswirkung im Hauptprozessbehälter 1 erreicht werden kann, wird das zulaufende mit Feststoffpartikeln und/oder Feststofffasern beladene Abwasser mittels Luftblaseneinführung aufgeschäumt. Zu diesem Zwecke besitzt die Flotationsanlage zur Abwasserbehandlung nach dem Stand der Technik einen Luftmischtank 3, in dem durch einen nicht gezeigten Hochdruckkompressor verdichtete Druckluft mit Wasser aus einem Klarwasserbehälter 4 im Ablauf des Hauptprozessbehälters 1 gemischt und dann der Zulaufleitung 2 zugeführt wird. As shown in FIG. 1, a known flotation plant of the prior art has a main process vessel 1 into which wastewater laden with solid particles and / or solid fibers to be cleaned with the feed line 2 is introduced. So that the desired flotation effect can be achieved in the main process vessel 1, the incoming wastewater laden with solid particles and / or solid fibers is foamed by means of air bubble introduction. For this purpose, the flotation plant for wastewater treatment according to the prior art has an air mixing tank 3 in which compressed compressed air is mixed with water from a clear water tank 4 in the course of the main process tank 1 by a high-pressure compressor, not shown, and then the feed line 2 is supplied.
Wie Figur 2 veranschaulicht, weist eine Flotationsanlage nach der Erfindung ebenfalls einen Hauptprozessbehälter 1 auf, in den mit der Zulaufleitung 2 zu reinigendes mit Feststoffpartikeln und/oder Feststofffasern beladenes Abwasser eingeleitet wird. Damit die erwünschte Flotationswirkung im Hauptprozessbehalter 1 erreicht werden kann, wird das zulaufende mit Feststoffpartikeln und/oder Feststofffasern beladene Abwasser ebenfalls mittels Luftblaseneinführung aufgeschäumt. Zu diesem Zwecke ist in der Flotationsanlage zur Abwasserbehandlung nach der Erfindung ein Diffu- sor 5 angeordnet, und zwar innerhalb einer Leitungsrückführung 6 von der Ablaufleitung des Hauptprozessbehälters 1 , die das von den Feststoff Partikeln und/oder Feststofffasern befreite Abwasser als Klarwasser führt, zur Zulaufleitung 2 des mit Feststoffpartikeln und/oder Feststofffasern beladenen Abwassers. As FIG. 2 illustrates, a flotation plant according to the invention likewise has a main process vessel 1, into which wastewater laden with solid particles and / or solid fibers to be cleaned with the feed line 2 is introduced. So that the desired flotation effect can be achieved in Hauptprozessbehalter 1, the incoming wastewater laden with solid particles and / or solid fibers is also foamed by means of air bubble introduction. For this purpose, in the flotation plant for wastewater treatment according to the invention, a diffusion Sor 5 arranged, namely within a line return 6 from the drain line of the main process vessel 1, which leads the liberated from the solid particles and / or solid fibers wastewater as clear water to the feed line 2 of the laden with solid particles and / or solid fibers wastewater.
Der Diffusor 5 dient der Erzeugung der bereits zur Flotation notwendig qualifizierten Luftblasen, in dem er beim Durchströmen des abgetrennten Flüssigkeitsanteils des Klarwassers durch seinen Korpus mittels Luftzufuhröffnung Luft einsaugt und dem Flüssigkeitsanteil des Klarwassers auf diese Weise Luftblasen zusetzt. The diffuser 5 is used to generate the air bubbles already qualified for flotation, in which it sucks in air through its body through the air supply opening when flowing through the separated liquid portion of the clear water and adds air bubbles to the liquid portion of the clear water in this way.
Der Ausgang des Diffusors 5 ist mit der bereits genannten Zulaufleitung 2 des Hauptprozessbehälters 1 derart verbunden, dass die entstandenen Luftblasen in den Zulaufstrom des zu behandelnden mit Feststoffpartikeln und/oder Feststofffasern beladenen Abwassers in der Zulaufleitung 2 eingetragen werden. Das Ausführungsbeispiel gemäß der Figuren 1 und 2 hat beispielhaft folgende Betriebsdaten: The outlet of the diffuser 5 is connected to the already mentioned feed line 2 of the main process vessel 1 in such a way that the resulting air bubbles are introduced into the feed stream 2 of the waste water loaded with solid particles and / or solid fibers in the feed stream 2. The exemplary embodiment according to FIGS. 1 and 2 has the following operating data by way of example:
Die Belüftungsdaten der Flotationsanlage des Standes der Technik vor dem Einsatz der erfindungsgemäßen Anordnung betrugen: Der Einlauf an Abwasser zur Flotati- onsanlage beträgt 12000 l/min. Um Schwebstoffe zu flotieren, wird eine Teilstrommenge des von den Feststoffpartikeln und/oder Feststofffasern befreiten Abwassers - auch als gereinigtes Filtrat bezeichnet - von 2400 l/min - d. h. 20 % der behandelten Durchflussmenge - benötigt. Diese Menge wird mit einer Pumpe 7 mit einer Leistung von 150 kW bei einem Druck von 1 bar in den Luftmischtank 3 gedrückt und mit einströmender Druckluft von 10 bar vermischt. Das durchströmende gereinigte Filtrat im Luftmischtank 3 nimmt Luft im Verhältnis 1 :1 auf. Dadurch wird ein Filtrat- strom von 2400 l/min benötigt, um Luft in einer Menge von 2400 l/min zu transportieren, damit der zur Abtrennung der Feststoffpartikel und/oder Feststofffasern aus dem Abwasser notwendige Schaumauftrieb im Hauptprozessbehälter 1 der Flotati- onsanlage gewährleistet ist. The aeration data of the flotation plant of the prior art prior to the use of the arrangement according to the invention amounted to: The inlet to wastewater to the flotation plant is 12,000 l / min. To float suspended matter, a partial flow of the freed from the solid particles and / or solid fibers wastewater - also referred to as purified filtrate - of 2400 l / min - d. H. 20% of the treated flow rate - needed. This amount is pressed with a pump 7 with a capacity of 150 kW at a pressure of 1 bar in the air mixing tank 3 and mixed with incoming compressed air of 10 bar. The flowing purified filtrate in the air mixing tank 3 absorbs air in a ratio of 1: 1. As a result, a filtrate flow of 2400 l / min is required in order to transport air in an amount of 2400 l / min so that the foam buoyancy necessary for separating the solid particles and / or solid fibers from the wastewater is ensured in the main process vessel 1 of the flotation plant ,
Die in Figur 2 gezeigte erfindungsgemäße Anordnung weist folgende Betriebspara¬ meter auf: Von der Filtratpumpe 8 wird ein Teilstrom des von den Feststoffpartikeln und/oder Feststofffasern befreiten Abwassers von 500 l/min zum Zulauf des Diffu- sors 5 geführt, Nach dem Diffusor 5 wird dieser Teilstrom in die Zulaufleitung 2 zur Flotationsanlage eingeleitet. Mit dem Diffusor 5 wird bei einer Durchflussmenge von 500 l/min des von den Feststoffpartikeln und/oder Feststofffasern befreiten Abwas¬ sers und mindestens 1 ,5 bar Differenzdruck eine Luftansaugung von 5000 l/min erreicht. Der Einlaufdruck im Diffusorzulauf ist 2 bar. Mit diesem Druck werden bei einem Durchfluss von 500 l/min durch den Diffusor nur 3,5 kW installierte elektrische Leistung verbraucht. Die theoretische Energieeinsparung gegenüber der in Figur 1 gezeigten Anordnung des Standes der Technik beträgt 98 % und kann in der Praxis näherungsweise erreicht werden. The inventive arrangement shown in Figure 2 has the following Betriebspara ¬ meter: From the filtrate 8, a partial stream of freed from the solid particles and / or solid fibers wastewater of 500 l / min to the inlet of the diffuser 5, After the diffuser 5 is this partial flow is introduced into the supply line 2 to the flotation plant. With the diffuser 5 is at a flow rate of 500 l / min freed of the solid particles and / or solid fibers Abwas ¬ sers and at least 1, 5 bar differential pressure an air intake of 5000 l / min reached. The inlet pressure in the diffuser inlet is 2 bar. With this pressure, the diffuser consumes only 3.5 kW of installed electrical power at a flow rate of 500 l / min. The theoretical energy saving over the arrangement of the prior art shown in Figure 1 is 98% and can be approximately achieved in practice.
Im gezeigten Ausführungsbeispiel ist eine beispielhafte Anordnung in einer beispiel¬ haften Anwendung beschrieben worden. Die Erfindung schließt jedoch alle weiteren Anordnungen mit unterschiediichen Prozessapparaten ein, bei denen mittels der erfindungsgemäßen Anordnung eines Diffusors eine Luftblasenerzeugung in zu behandelnden Flüssigkeiten unter Verzicht auf Kompressoren, Gebläsen und Pumpen vorgenommen wird. In the embodiment shown, an exemplary arrangement has been described in an example ¬ haften application. However, the invention includes all other arrangements with unterschiediichen process apparatuses in which by means of the inventive arrangement of a diffuser, an air bubble generation in liquids to be treated is made waiving compressors, blowers and pumps.
Die Anordnung eines Diffusors im Strömungsbereich eines von den Feststoffparti- kein und/oder Feststofffasern befreiten Abwassers kann in allen physikalischen Prozessen eingesetzt werden, bei denen Luftanteile in Flüssigkeiten benötigt werden, wie bei der Flotation von Feststoff-Flüssigkeits-Gemischen, der Belüftung von Abwässern oder der Schlammkonditionierung. Mittels der Erfindung können sehr große Energieeinsparungen erreicht werden , in dem auf Kompressoren, Gebläse und Pumpen verzichtet werden kann. In den meisten Anwendungsfällen sind Energieeinsparungen von über 90 % denkbar und realistisch. Durch eine gleichmäßige Zerstreuung der mit dem Diffusor 5 erzeugten Luftblasen ist auch eine Injektion von Chemikalien in der Luftansaugung des Diffusors 5 möglich. Man erreicht in solchen Anwendungsfällen auch erhebliche Reduzierungen im Verbrauch von Chemikalien. Besonders vorteilhaft kann die erfindungsgemäße Anordnung zur Abtrennung von schwebenden Feststoffpartikeln und/oder Feststofffasern aus Feststoff-Flüssig¬ keits-Gemischen durch Flotation in der Papierproduktion eingesetzt werden, und zwar insbesondere in der Flotation zur Wasseraufbereitung in Kreisläufen von Flotati¬ onsanlagen sowie Deinkinganlagen. The arrangement of a diffuser in the flow area of a freed from the Feststoffparti- and / or solid fibers wastewater can be used in all physical processes in which air fractions are required in liquids, such as in the flotation of solid-liquid mixtures, the aeration of waste water or the mud conditioning. By means of the invention, very large energy savings can be achieved in which it is possible to dispense with compressors, blowers and pumps. In most cases, energy savings of more than 90% are conceivable and realistic. By a uniform dispersion of the air bubbles generated with the diffuser 5 and an injection of chemicals in the air intake of the diffuser 5 is possible. In such applications, considerable reductions in the consumption of chemicals are achieved. Particularly advantageous is the arrangement of the invention for the separation of suspended solid particles and / or solid fibers of solid-liquid ¬ keits mixtures can be used by flotation in paper production, in particular in the flotation water treatment in circuits of Flotati ¬ onsanlagen and deinking plants.
Auch bei der allgemeinen kommunalen Wasseraufbereitung, bei aerobischen Prozessen und bei der Stabilisierung von Schlämmen ist die Erfindung mit Vorteil einsetzbar. Liste der verwendeten Bezugszeichen Liste der verwendeten Bezugszeichen Also in the general municipal water treatment, aerobic processes and in the stabilization of sludge, the invention can be used with advantage. List of reference numbers used List of reference numbers used
1 Hauptprozessbehälter 1 main process tank
2 Zulaufleitung  2 supply line
3 Luftmischtank 3 air mixing tank
4 Klarwasserbehälter  4 clear water tanks
5 Diffuser  5 diffusers
6 Leitungsrückführung  6 line feedback
7 Pumpe  7 pump
8 Filtratpumpe 8 filtrate pump

Claims

Patentansprüche claims
1 . Anordnung zur Abtrennung von schwebenden Feststoffpartikeln und/oder Fest- stofffasern aus Feststoff-Flüssigkeits-Gemischen durch Flotation, 1 . Arrangement for separating floating solid particles and / or solid fibers from solid-liquid mixtures by flotation,
die einen Hauptprozessbehälter (1 ) aufweist, in den das zu trennende Feststoff- Flüssigkeits-Gemisch über eine Zulaufleitung (2) eingeleitet wird, welcher die zur Durchführung der Flotation benötigten Luftblasen zugeführt werden,  which has a main process container (1) into which the solid-liquid mixture to be separated is introduced via a feed line (2) to which the air bubbles required for carrying out the flotation are supplied,
wobei zur Erzeugung dieser Luftblasen ein Diffusor (5) vorhanden ist, in dessen Eingang ein Teil der aus dem Hauptprozessbehälter { ) ausgeförderten von den Feststoffpartikeln und/oder Feststofffasern befreiten Flüssigkeit geführt ist und dessen Düsenanordnung über eine Luftzufuhröffnung verfügt,  a diffuser (5) being present in the inlet of which a part of the liquid discharged from the main particles and / or solid fibers is conveyed out of the main process tank {1) and whose nozzle arrangement has an air supply opening,
wobei der Ausgang des Diffusors (5) mit der bereits genannten Zulaufleitung (2) des Hauptprozessbehälters (1 ) derart verbunden ist,  the outlet of the diffuser (5) being connected to the feed line (2) of the main process container (1) already mentioned,
dass die im Diffusor (5) aus der Einsaugung von Luft in den durch den Diffusor (5) geführten Teil der bereits von den Feststoffpartikeln und/oder Feststofffasern befreiten Flüssigkeit entstehenden Luftblasen in den Zulaufstrom des zu flotieren- den Feststoff-Flüssigkeits-Gemisches eingeführt werden.  in that the air bubbles produced in the diffuser (5) from the suction of air into the part of the liquid already freed from the solid particles and / or solid fibers by the diffuser (5) are introduced into the feed stream of the solid-liquid mixture to be floated ,
2. Anordnung nach Anspruch 1 , 2. Arrangement according to claim 1,
dadurch gekennzeichnet, dass  characterized in that
der Diffusor (5) ausgangsseitig mit der Zulauf leitung (2) des Hauptprozessbehälters (1 ) verbunden ist, während sein Eingang mit einer Rein wasserquelle verbun¬ den ist. the diffuser (5) on the output side with the feed line (2) of the main process vessel (1) is connected, while its input to a pure water source verbun ¬ is the.
EP11755240.6A 2010-06-16 2011-05-21 Arrangement for separating floating solid particles and/or solid fibers from solid-liquid mixtures by means of flotation Withdrawn EP2582464A2 (en)

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DE202010009140U DE202010009140U1 (en) 2010-06-16 2010-06-16 Arrangement for generating air bubbles in liquids
DE102010027448A DE102010027448A1 (en) 2010-06-16 2010-07-17 Arrangement for generating air bubbles in liquids
PCT/DE2011/001095 WO2011157253A2 (en) 2010-06-16 2011-05-21 Arrangement for separating floating solid particles and/or solid fibers from solid-liquid mixtures by means of flotation

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WO2011157253A4 (en) 2012-06-07
WO2011157253A3 (en) 2012-04-19

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