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WO2024054120A1 - Dispositif de flottation - Google Patents

Dispositif de flottation Download PDF

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Publication number
WO2024054120A1
WO2024054120A1 PCT/NO2023/060045 NO2023060045W WO2024054120A1 WO 2024054120 A1 WO2024054120 A1 WO 2024054120A1 NO 2023060045 W NO2023060045 W NO 2023060045W WO 2024054120 A1 WO2024054120 A1 WO 2024054120A1
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
water
gas
particles
inlet chamber
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.)
Ceased
Application number
PCT/NO2023/060045
Other languages
English (en)
Inventor
Eivind SINGDAHLSEN
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.)
Stauper Environment AS
Original Assignee
Stauper Environment AS
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 Stauper Environment AS filed Critical Stauper Environment AS
Publication of WO2024054120A1 publication Critical patent/WO2024054120A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B03D1/02—Froth-flotation processes
    • B03D1/028—Control and monitoring of flotation processes; computer models therefor
    • 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
    • B03D1/1418—Flotation machines using centrifugal forces
    • 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
    • B03D1/1431—Dissolved air flotation machines
    • 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
    • B03D1/1456—Feed mechanisms for the slurry
    • 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
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • 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
    • B03D2203/00—Specified materials treated by the flotation agents; Specified applications
    • B03D2203/008—Water purification, e.g. for process water recycling
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/42—Liquid level
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/02—Fluid flow conditions
    • C02F2301/026—Spiral, helicoidal, radial
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2866—Particular arrangements for anaerobic reactors
    • C02F3/2886—Two story combinations of the Imhoff tank type

Definitions

  • Present invention relates to a device and method for the removal of particles and/or sludge especially from municipal and industrial sewage water.
  • DGF/DAF Dissolved Gas/Air Flotation
  • Norwegian patent NO327190 relates to a flotation device for flotation of fluids containing particles.
  • the device comprises a flotation unit with an inlet tube is situated in the lower part of the flotation unit, and where said flotation unit comprises an inner, open-ended conical container with a large upper cross-section and a relatively smaller lower cross-section. Further the flotation unit is provided with a scraper for removal of material at the upper part of the unit.
  • the conical container has a downward open tube, in said tube it is provided a funnel-shaped unit with a large, upper opening area and close to its lower end, the funnel-shaped unit is closed against the tube but is provided with an outlet tube to remove cleaned liquid from the flotation unit.
  • the inlet tube is directed upwards, preferably centrally at the bottom of the flotation unit and is configured to lead the liquid flow against a distributor plate which distributes the liquid centrally over the whole flotation area.
  • Typical features for the DGF method are that it requires large volumes of the separation vessels in order to obtain the required retention time and the mixing of water and gas is relatively ineffective. Further the separation is performed in the same, open vessel which means that smaller particles can follow the cleaned water to the bottom of the vessel.
  • Norwegian patent NO156975 relates to a flotation device for separating materials in a liquid, said materials having a density which is close to the density of the liquid.
  • the device is especially configured to recover fat and fatty substances and protein and protein like compounds.
  • the device comprises an outer container provided with scraper at the upper part for removal of the material and a device at the bottom to remove precipitated material. Further, the device comprises an inlet tube ending in the lower part of the device, externally of a conical container which is centrally mounted in the outer container.
  • the upper part of the conical container is provided with a liquid opening, preferably directed in a downward direction towards the lower, tapered part of the conical container, which is provided in the outer container, said conical container is provided with some distance to the bottom of the outer container, and an outlet pipe for removal of treated liquid.
  • the lower part of the conical container is provided with a ring with one or more openings, in order to remove water from the feed water through the openings.
  • the other part of the conical container is provided with a tube for emptying the container.
  • Norwegian patent 327190 relates to a flotation device with an inlet tube in the lower end of the flotation unit, where said flotation unit comprises an inner, upward open funnel-shaped vessel with a large cross-sectional area in its upper part and a substantially smaller cross-sectional area at its lower end, and where the flotation unit is provided with a scraper for removal of flotate at its upper end.
  • the flotation device is provided with a downward open pipe socket in which a funnel-shaped unit with a large upper opening area and that the lower end of the funnel-shaped unit is closed against the pipe socket but is provided with an outlet pipe to empty cleaned liquid from the flotation unit.
  • the inlet tube is directed in an upward direction centrally at the bottom of the flotation unit and is configured to direct the liquid flow against a distribution disk which is distributing the liquid centrically over the whole flotation area.
  • WO9108175A1 describes a method and apparatus for sewage purification using flotation.
  • the apparatus may contain an outer and an inner vessel, where the outer vessel may contain a bell open at the bottom with upward directed leading- away channels for purified liquid. Possible downward directed shells between the vessel further enhance the purification of the vessel.
  • the inlet tube is directed tangentially to the inner vessel.
  • a device for removal of particles and/or sludge from a water body, especially from municipal and industrial sewage water comprising:
  • the device further comprising:
  • an inlet chamber receiving the mixed gas and water from the gas/water mixer, said inlet chamber has an upstanding cylindrical shape with an open upper end and a closed lower end,
  • inlet pipe(s) is/are oriented tangentially in the lower part of the inlet chamber to provide the mixed gas and water with a swirling motion inside the inlet chamber;
  • a sludge funnel provided with a sludge ramp with a sludge outlet for collection and removal of sludge/particles from the upper surface of the perforated plate
  • one or more scrapers provided with a scraper motor for removal of the sludge/particles from the upper surface of the perforated plate and bring the sludge/particles to the sludge funnel.
  • the gas supplied to the gas/water mixer is in the form of microbubbles/nanobubbles.
  • the size of the microbubbles/nanobubbles is between 20 pm and 80 pm, more preferred between 40 pm and 60 pm.
  • the bottom of the cylindrical inlet chamber has an upward conical shape with an outlet for sedimented particles /sludge at the periphery of the bottom.
  • the gas to be mixed with the water to be treated is air.
  • the device according to the invention further comprising a level control device , preferably a plate that can be moved up and down to adjust the water level in the device.
  • a level control device preferably a plate that can be moved up and down to adjust the water level in the device.
  • the perforated plate is exchangeable with other plates with smaller or larger perforations.
  • Figure 1 depicts a vertical cross section of the flotation unit
  • Figure 2 depicts the flotation unit seen from above.
  • FIG. 1 and 2 depicts the flotation unit according to present invention.
  • the flotation unit comprises an outer vessel (22) with a conical lower part (18) which has an outlet (17) for sedimented sludge/particles.
  • This vessel (22) is open at the top and will thereby operate under ambient pressure.
  • it comprises an inlet chamber (24), which is an upright cylindrical vessel with an upward conical closed bottom (14).
  • This inlet chamber (24) is preferably provided centrally in the outer vessel (22).
  • the water to be cleaned (10) is supplied with a gas (12) and led to a mixer (11 ) to mix the water and the gas.
  • the gas is air, but in some embodiments, the gas can also be oxygen or nitrogen.
  • the gas is in the form of nanobubbles/microbubbles.
  • This water/gas flow is supplied to the lower part of the inlet chamber (24) through one or more tangential inlet pipes (13). Due to the tangential inlet tube(s), the water/gas mixture will obtain a swirling motion in the inlet chamber (24). Heavier particles/sludge will sink down to the bottom of the inlet chamber and due to the upward conical shape of the bottom (14) the particles /sludge can be removed at the periphery of the bottom through an outlet pipe (16) provided with a valve (15). At the upper part of the outer vessel (22) there is provided a perforated plate (19) which covers a substantial sector of the top of the outer vessel.
  • this perforated plate (19) can be removed in order to provide plates with larger or smaller perforations depending on the size of the particles to be removed.
  • the center of the perforated plate (19) has a circular opening to accommodate the upper part of the inlet chamber (24).
  • the upper part of the inlet chamber (19) protrudes a small distance above the upper surface of the perforated plate (19).
  • the top of the outer vessel is provided with a sludge ramp (6) covering a part of the upper open part of the outer vessel (22). This sludge ramp (6) is elevated above the upper surface of the perforated plate (19).
  • a sludge funnel (7) for collection and removal of sludge through a sludge outlet (8).
  • the top of the flotation unit is provided with a scraping device comprising a motor (1 ) and one or more scrapers (3). The lower part of the scraper(s) (3) is positioned at the level of the perforated plate (18).
  • the flotation unit comprises an outlet chamber (9) for cleaned water with a level control device (5).
  • the purpose of this level control device (5) is to control the water level in the flotation device in order to have a correct water level despite a reduction or increase of the flow rate.
  • This device (5) can in one embodiment be a plate which can be manually or automatically moved up and down to increase or decrease the water level, respectively.
  • Water to be cleaned (10) is mixed with gas (12), preferably air, in a gas/water mixer (11 ) where the gas is dissolved as small bubbles in the water.
  • gas (12) preferably air
  • This gas/water mixture is led to an inlet chamber (24) by one or more tangential inlet pipes (13). Due to the tangential configuration of the inlet pipe(s) (13), the gas/water mixture is set in a swirling motion in the inlet chamber (24).
  • the water/gas mixture is moving upwards in the inlet chamber and the gas bubbles will adhere to the sludge/particles, and the sludge/particles (2) will flow upwards and out of the inlet chamber (24) an onto the perforated plate (19).
  • the sludge/particles will collect on the upper surface of the plate (19) and the water will flow down into the outer vessel through the perforations in the plate (19).
  • the collected sludge/particles (2) will finally be scraped off from the perforated plate (19) and fall down into the outlet chute (7).
  • the cleaned water will move downwards in the outer vessel (18) and will finally be removed from the flotation unit via a level control (5) as a stream (9). Remaining heavier sludge/particles will be collected in the lower part of the outer vessel (18) and will be removed through the outlet (17) for sedimented sludge.
  • the flotation process according to the invention is a co-current process, which means that there is no contact between the cleaned water and polluted water. Further, since the mixture of water and gas is led into the inlet chamber (24), the retention time of the water in the flotation device can be drastically reduced compared to the prior art solutions discussed above. Due to the reduction of retention time, the actual size and footprint of the flotation device can be highly reduced compared to prior art solutions with the same capacity.
  • the flotation device according to present invention has a wide range of applications, such as removal of microplastic, sludge removal in municipal sewage treatment plants, removal of feces and feed residues in onshore based fish farms, particle removal within the construction industry, and several applications within the food industry and maritime sector.

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

Abstract

L'invention concerne un dispositif d'élimination de particules et/ou de boues d'une masse d'eau, en particulier d'eaux usées municipales et industrielles, ce dispositif comprenant : une cuve externe (22) avec une partie inférieure conique (18) comprenant une sortie (17) pour les boues ou particules sédimentées ; un orifice d'admission (10) pour l'eau à traiter ; une sortie (9) pour l'eau traitée ; une sortie (8) pour les boues ou les particules séparées, dispositif comprenant en outre : un mélangeur gaz/eau (11) pour mélanger l'eau à traiter avec un gaz (12) ; une chambre d'admission (24) recevant le mélange gaz/eau provenant du mélangeur gaz/eau (11), ladite chambre d'admission (24) ayant une forme cylindrique verticale avec une extrémité supérieure ouverte et une extrémité inférieure fermée, un ou plusieurs tuyaux d'admission (13) allant du mélangeur gaz/eau à la chambre d'admission (24), ledit tuyau d'admission (13) étant orienté tangentiellement dans la partie inférieure de la chambre d'admission (24) pour soumettre le mélange gaz/eau à un mouvement tourbillonnant à l'intérieur de celle-ci ; une plaque perforée (19) couvrant une grande partie de l'ouverture supérieure de la cuve externe (22), ladite extrémité supérieure de la chambre d'admission (24) dépassant d'une certaine distance la surface supérieure de la plaque perforée (19), un entonnoir à boues (7) muni d'une rampe à boues (6) avec une sortie (8) de boues pour la collecte et l'élimination des boues ou des particules de la surface supérieure de la plaque perforée (19), et un ou plusieurs racleurs (3) munis d'un moteur de raclage (1) pour l'élimination des boues ou des particules de la surface supérieure de la plaque perforée et l'acheminement des boues ou particules vers l'entonnoir à boues (7).
PCT/NO2023/060045 2022-09-09 2023-09-05 Dispositif de flottation Ceased WO2024054120A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20220965A NO348354B1 (en) 2022-09-09 2022-09-09 Flotation device
NO20220965 2022-09-09

Publications (1)

Publication Number Publication Date
WO2024054120A1 true WO2024054120A1 (fr) 2024-03-14

Family

ID=88315436

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2023/060045 Ceased WO2024054120A1 (fr) 2022-09-09 2023-09-05 Dispositif de flottation

Country Status (2)

Country Link
NO (1) NO348354B1 (fr)
WO (1) WO2024054120A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO156975B (no) 1982-09-20 1987-09-21 Ake Stigebrandt Anordning for separering av stoffer som finnes i vŸske og har en tetthet som ligger nŸr vŸskens tetthet.
WO1991008175A1 (fr) 1989-12-04 1991-06-13 Akvagad A/S Procede de purification d'eaux d'egout par flottation et appareil de mise en ×uvre du procede
EP0682985A1 (fr) 1994-05-20 1995-11-22 Fabio Perletti Dispositif pour la clarification à niveau élevé de liquides contenants des particules solides en suspension
WO1999025658A1 (fr) 1997-11-14 1999-05-27 Beloit Technologies, Inc. Clarificateur a deshydratation des boues
JP3770475B2 (ja) 2001-10-23 2006-04-26 株式会社石垣 浮上濃縮装置
NO327190B1 (no) 2007-11-05 2009-05-04 Anoxkaldnes As Flotasjonstank
US20130048548A1 (en) * 2011-08-29 2013-02-28 Process Group Technologies Pty Ltd Compact separation apparatus
EP3018101A1 (fr) 2013-07-04 2016-05-11 Korea Aquosys Co., Ltd. Dispositif de flottation à l'air dissous
WO2019221609A1 (fr) 2018-05-14 2019-11-21 Stauper Offshore As Système de commande adaptatif pour un séparateur eau-hydrocarbure
NO20190982A1 (fr) * 2019-08-14 2021-02-15

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI680105B (zh) * 2019-01-10 2019-12-21 鍵順三菱股份有限公司 高效率溶氣浮除處理設備

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO156975B (no) 1982-09-20 1987-09-21 Ake Stigebrandt Anordning for separering av stoffer som finnes i vŸske og har en tetthet som ligger nŸr vŸskens tetthet.
WO1991008175A1 (fr) 1989-12-04 1991-06-13 Akvagad A/S Procede de purification d'eaux d'egout par flottation et appareil de mise en ×uvre du procede
EP0682985A1 (fr) 1994-05-20 1995-11-22 Fabio Perletti Dispositif pour la clarification à niveau élevé de liquides contenants des particules solides en suspension
WO1999025658A1 (fr) 1997-11-14 1999-05-27 Beloit Technologies, Inc. Clarificateur a deshydratation des boues
JP3770475B2 (ja) 2001-10-23 2006-04-26 株式会社石垣 浮上濃縮装置
NO327190B1 (no) 2007-11-05 2009-05-04 Anoxkaldnes As Flotasjonstank
US20130048548A1 (en) * 2011-08-29 2013-02-28 Process Group Technologies Pty Ltd Compact separation apparatus
EP3018101A1 (fr) 2013-07-04 2016-05-11 Korea Aquosys Co., Ltd. Dispositif de flottation à l'air dissous
WO2019221609A1 (fr) 2018-05-14 2019-11-21 Stauper Offshore As Système de commande adaptatif pour un séparateur eau-hydrocarbure
NO20190982A1 (fr) * 2019-08-14 2021-02-15

Also Published As

Publication number Publication date
NO348354B1 (en) 2024-12-02
NO20220965A1 (en) 2024-03-11

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