US20060255482A1 - Device for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins - Google Patents

Device for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins Download PDF

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Publication number
US20060255482A1
US20060255482A1 US11/407,778 US40777806A US2006255482A1 US 20060255482 A1 US20060255482 A1 US 20060255482A1 US 40777806 A US40777806 A US 40777806A US 2006255482 A1 US2006255482 A1 US 2006255482A1
Authority
US
United States
Prior art keywords
axial flow
liquid
deflector
gas
flow rotor
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.)
Abandoned
Application number
US11/407,778
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English (en)
Inventor
Gilbert Chevalier
Alain Villermet
Christian Larquet
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.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude
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 LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude filed Critical LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude
Assigned to L'AIR LIQUIDE, SOCIETE ANONYME A DIRCETOIRE ET CONSEIL DE SURVEILLANCE POUR I'ETUDE ET I'EXPLOITATION DES PROCEDES GEORGES CLAUDE reassignment L'AIR LIQUIDE, SOCIETE ANONYME A DIRCETOIRE ET CONSEIL DE SURVEILLANCE POUR I'ETUDE ET I'EXPLOITATION DES PROCEDES GEORGES CLAUDE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VILLERMET, ALAIN, CHEVALIER, GILBERT, LARQUET, CHRISTIAN
Publication of US20060255482A1 publication Critical patent/US20060255482A1/en
Priority to US13/401,421 priority Critical patent/US8308143B2/en
Priority to US13/664,254 priority patent/US20130127073A1/en
Abandoned legal-status Critical Current

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    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/14—Activated sludge processes using surface aeration
    • C02F3/16—Activated sludge processes using surface aeration the aerator having a vertical axis
    • 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a device for stirring a liquid in a reactor and for injecting a gas into this liquid.
  • Document EP-A1-0 995 485 describes a device for stirring a liquid in a reactor or basin and for injecting a gas into this liquid.
  • This device comprises a motor for driving a vertical shaft positioned above the reactor.
  • the shaft of the motor carries and drives at its lower end a propeller immersed in the liquid. It also carries and drives a self-aspirating turbine placed between the surface of the liquid and the propeller.
  • the self-aspirating turbine is connected to a gas source, generally an oxygenated gas, so that when it is driven by the shaft of the motor, it draws in at the same time gas and the liquid in which it is immersed, forming in this way a gas-liquid dispersion.
  • the gas-liquid dispersion generated by the self-aspirating turbine is directed towards the propeller with the aid of an annular shell forming a deflector which envelops the self-aspirating turbine.
  • the pumping power of the propeller produces descending currents of liquid and gas that can reach more than 7 meters deep. Also, when the bottom of the basin is situated at 7 meters or less, the current strikes the bottom. This is of no importance if the walls and bottom of the reactor are made of concrete or if the depth exceeds 3 meters. On the contrary, this makes it possible to disturb the sludge which tends to accumulate at the bottom of the reactor.
  • some reactors possess walls and a bottom made of geotextile membranes or clay, which are very sensitive to abrasion. In general, these basins are not very deep (1.5 to 3 meters). The impact of a powerful flow erodes and hollows out such bottoms, until the waterproofness of the reactor is endangered. Moreover, moving large quantities of clay disturbs the settling of sludge downstream from the aeration basin.
  • the object of the present invention is to provide a device for stirring a liquid in a reactor and for injecting a gas into this liquid, in which a powerful axial flow is created, that can be employed in shallow basins or in basins with friable walls.
  • the invention concerns a device for stirring a liquid in a reactor and for injecting a gas into the said liquid in order to form a gas-liquid dispersion, comprising:
  • FIG. 1 is a view of a device according to the invention
  • FIG. 2 is a view of the deflector placed below the axial flow rotor and converting the axial flow of the said rotor into a radial flow that can be used in the device according to the invention
  • FIG. 3 is a view from below of a device according to the invention.
  • FIG. 4 is a cross section of the deflector used in FIG. 3 .
  • reactor signifies a natural “basin” as well as “reservoir” with walls that are more or less near to each other and with a more or less closed cover.
  • the invention therefore relates to a device for stirring a liquid in a reactor and for injecting a gas into the said liquid in order to form a gas-liquid dispersion, comprising:
  • the stirring device comprises a drive device, for example a motor, positioned above the surface of the liquid, provided with a rotary output shaft extending vertically and partially immersed in the liquid.
  • the shaft carries at its lower end an axial flow rotor, which may be a propeller or a screw, immersed in the liquid and generally directing the liquid towards the bottom of the basin.
  • the device also includes means for introducing gas above the axial flow rotor and in the liquid so that the gas and liquid are entrained by the axial flow rotor and a gas-liquid dispersion is created.
  • the device finally includes a deflector placed above the axial flow rotor shaped so that it prevents the gas-liquid dispersion rising.
  • This shape can enable the axial flow to be directed towards the bottom of the basin and/or can serve to collect the gas, preventing the latter from escaping to the surface of the basin.
  • the essential feature of the invention lies in the fact that a supplementary deflector is placed below the axial flow rotor and has a shape such that it converts the axial flow created by the rotor into a radial flow.
  • the deflector placed below the axial flow rotor may be a plate that is generally circular. This plate is preferably centered on the output shaft. It may be advantageous to place this deflector below the axial flow rotor at the greatest possible distance from the said rotor so as to make best use of the depth available under the stirring device. In general, the surface area of the deflector placed below the axial flow rotor is increased as a function of the distance between this deflector and this axial flow rotor.
  • the surface area of the deflector may be at least of the order of the area projected onto it by the axial flow rotor.
  • the surface area of the deflector may also be extended to the area projected onto it by the overall stirring device.
  • a deflector cone or prism may be centered on the plate.
  • the angle of the cone or prism may be optimized according to the distance between the deflector placed below the axial flow rotor and the said axial flow rotor.
  • the deflector placed below the axial flow rotor may be fixed to the output shaft of the drive device. When the device operates, the deflector placed below the axial flow rotor is then also driven by the motor.
  • This implementation has the advantage of making it possible to modify rapidly a device of the prior art so as to adapt it to shallow basins since it is sufficient to add a deflector to the drive shaft.
  • the deflector placed below the axial flow rotor consists of:
  • the divergent profile of the surface portions is advantageously calculated so as to offer a minimum passage section under the axial flow rotor, the said section widening downwards.
  • This minimum section may represent 1.5 to 3 times the projected section of the axial flow rotor.
  • the shape of the divergent profile makes it possible to force the flow of the gas/liquid dispersion to surge between the surface portions and the central shaft of the rotor.
  • the diameter of the circular path taken by the surface portions is preferably not less than the diameter of the axial flow rotor.
  • the deflector then consists of two parts: the central plate and the surface portions angularly distributed around the plate.
  • the central plate is preferably circular. It may be fixed to the output shaft of the drive device as for the first variant.
  • a deflector cone may advantageously replace the central plate.
  • Surface portions angularly distributed around the plate are situated at a distance from the central plate or cone. According to the invention, these surface portions have a progressive profile diverging outwards and towards the bottom of the reactor. Thus, in cross section along a plane passing through the vertical output shaft, these surfaces have a profile that deviates towards the outside and bottom of the reactor. This profile is generally curved so as to generate a Coanda-type effect on any rapid flow circulating tangentially to the inlet of the profile.
  • the axial flow coming from the axial flow rotor is redirected by the central plate or cone tangentially to the profile described by the previously described surfaces. It is pressed against the surface portions angularly distributed around the central plate or cone.
  • the Coanda effect obtained in this way presses the flow of the gas/liquid dispersion against the surface portions. This flow is released at the end of the profile at the angle defined by this.
  • the end of the profile is preferably horizontal so as to obtain a radial flow directed towards the vertical walls of the reactor.
  • This second variant makes it possible to limit pressure loss when the axial flow comes again into contact with the deflector and makes the flow uniform.
  • the speed of the liquid redirected by the deflector is very rapid and the flow rate is high and consequently operation of the axial flow rotor is not hindered by the added deflector.
  • the conditions for transferring gas into the liquid remain optimum.
  • radial ejection of the flow may be controlled in relation to the vertical. It is possible in this way to give better distribution of the flow in the basin.
  • the device has means for introducing gas above the special axial flow rotor, which consists of:
  • FIG. 1 enables a device according to the present invention to be characterized.
  • the device comprises a drive device 1 , for example a motor, positioned above the surface of the liquid, provided with a rotary output shaft 2 extending vertically and partially immersed in the liquid.
  • the shaft 2 carries at its lower end an axial flow rotor 4 , a propeller, immersed in the liquid.
  • the shaft 2 also carries, positioned between the propeller 4 and the surface of the liquid, a self-aspirating turbine 3 which is consequently immersed in the reactor and is driven by the output shaft 2 at the same speed as the propeller 4 .
  • the output shaft 2 is enveloped coaxially by a cylinder 7 connected at its upper end to the drive device 1 , with the interposition of a sealing device, and of which the lower end 7 a emerges in the turbine 3 coaxially to the shaft 2 .
  • an opening 8 is drilled for injecting a gas into the annular gap 9 delimited by the shaft 2 and by the cylinder 7 .
  • the system for injecting gas into the orifice 8 is not shown.
  • the auto-aspirating turbine 3 consists of two discs 10 , 11 placed horizontally, and an assembly of radial blades, placed between the discs 10 , 11 and attached thereto.
  • a first deflector 5 is placed above the turbine 3 and the axial flow rotor 4 .
  • a second deflector 6 is placed on the shaft 2 below the axial flow propeller 4 .
  • the device of FIG. 1 also includes counter-blades 14 for directing the different flows so as to maximize performance in terms of transfer and stirring.
  • FIG. 2 illustrates a deflector 6 designed to be placed below the axial flow rotor having the form of a plate, centered on the output shaft 2 , and at the centre of which a deflector cone 13 is placed.
  • FIG. 3 illustrates a device according to the invention seen from below.
  • This device is fitted with a deflector 61 , 62 placed below the axial flow rotor 4 of which three blades may be identified on the drawing.
  • This deflector consists of a central circular plate 61 , and surface portions 62 angularly distributed around the central circular plate 61 and having a progressive profile diverging outwards.
  • This special shape brings about a Coanda-type effect on any flow surging tangentially to the profile described by the surface portions 62 .
  • These surface portions 62 are fixed to the counter-blades 14 of the stirring device.
  • FIG. 4 is a cross section along the axis xx′ of the deflector of FIG. 3 : the deflector cone centered on the central plate may be observed as well as the profile of the surface portions 62 angularly distributed around the central plate, enabling the Coanda effect to be generated.
  • the arrows represent the current of the flow along the central plate or deflector cone 61 and the portions angularly distributed around the central plate or cone.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US11/407,778 2005-04-19 2006-04-19 Device for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins Abandoned US20060255482A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/401,421 US8308143B2 (en) 2005-04-19 2012-02-21 Method for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins
US13/664,254 US20130127073A1 (en) 2005-04-19 2012-10-30 Method for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0550985 2005-04-19
FR0550985A FR2884442B1 (fr) 2005-04-19 2005-04-19 Dispositif d'agitation d'un liquide et d'injection d'un gaz dans ce liquide adapte a des bassins de faibles profondeurs

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US13/401,421 Continuation US8308143B2 (en) 2005-04-19 2012-02-21 Method for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins
US13/664,254 Continuation US20130127073A1 (en) 2005-04-19 2012-10-30 Method for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins

Publications (1)

Publication Number Publication Date
US20060255482A1 true US20060255482A1 (en) 2006-11-16

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Application Number Title Priority Date Filing Date
US11/407,778 Abandoned US20060255482A1 (en) 2005-04-19 2006-04-19 Device for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins
US13/401,421 Active US8308143B2 (en) 2005-04-19 2012-02-21 Method for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins
US13/664,254 Abandoned US20130127073A1 (en) 2005-04-19 2012-10-30 Method for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins

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Application Number Title Priority Date Filing Date
US13/401,421 Active US8308143B2 (en) 2005-04-19 2012-02-21 Method for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins
US13/664,254 Abandoned US20130127073A1 (en) 2005-04-19 2012-10-30 Method for stirring a liquid and for injecting a gas into this liquid, suitable for shallow basins

Country Status (7)

Country Link
US (3) US20060255482A1 (fr)
EP (1) EP1716916B1 (fr)
AT (1) ATE380579T1 (fr)
CA (1) CA2542729C (fr)
DE (1) DE602006000311T2 (fr)
ES (1) ES2297819T3 (fr)
FR (1) FR2884442B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100187701A1 (en) * 2009-01-29 2010-07-29 Aqua-Aerobic Systems, Inc. Downflow mixers with gas injection devices and/or baffles
US10202296B2 (en) * 2013-07-18 2019-02-12 Sun Won Jang Aeration device
US10683221B2 (en) 2017-12-14 2020-06-16 L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Gas injection and recycling apparatus and methods
CN114751532A (zh) * 2022-03-18 2022-07-15 华夏中然生态科技集团有限公司 一种污水处理用增氧型曝气设备及其方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2884442B1 (fr) * 2005-04-19 2007-05-25 Air Liquide Dispositif d'agitation d'un liquide et d'injection d'un gaz dans ce liquide adapte a des bassins de faibles profondeurs
FR2975606B1 (fr) * 2011-05-25 2013-05-31 Air Liquide Equipement pour l'injection d'un gaz dans un bassin d'epuration
FI124934B (fi) * 2013-01-30 2015-03-31 Outotec Oyj Sekoitussäiliöreaktori
US11352276B2 (en) * 2020-05-01 2022-06-07 Aqua-Aerobic Systems, Inc. Flow straightening vane for aerator

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US4265739A (en) * 1979-01-23 1981-05-05 Dalton Robert W Flotation machines and components thereof
US4290885A (en) * 1977-12-22 1981-09-22 Dochan Kwak Aeration device
US4310437A (en) * 1979-09-25 1982-01-12 Bergwerksverband Gmbh Foam breaker for gas/liquid reactors
US4818404A (en) * 1987-07-08 1989-04-04 Tri-Bio, Inc. Submerged biological wastewater treatment system
US6109449A (en) * 1998-11-04 2000-08-29 General Signal Corporation Mixing system for separation of materials by flotation
US6142458A (en) * 1998-10-29 2000-11-07 General Signal Corporation Mixing system for dispersion of gas into liquid media
US6270061B1 (en) * 1998-10-09 2001-08-07 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device for agitating a liquid in a reactor and for injecting a gas into this liquid
US6460830B1 (en) * 1997-01-08 2002-10-08 Carbofil International Device for stirring and aerating a liquid and eliminating foam in a tank for treating said liquid

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CH294349A (fr) * 1951-08-13 1953-11-15 Pista Sa Installation pour le traitement d'un liquide.
CH466818A (fr) * 1967-12-08 1968-12-15 Pista Sa Procédé de traitement d'un liquide au moyen d'un fluide gazeux et installation pour la mise en oeuvre de ce procédé
FR2848472B1 (fr) * 2002-12-12 2005-02-18 Air Liquide Dispositif d'agitation d'un liquide et d'injection d'un gaz dans ce liquide a engorgement limite
FR2868332B1 (fr) * 2004-03-31 2006-05-26 Air Liquide Electronics Sys Appareil de traitement d'effluents gazeux
US8146894B2 (en) * 2004-06-21 2012-04-03 Hills Blair H Apparatus for mixing gasses and liquids
FR2884442B1 (fr) * 2005-04-19 2007-05-25 Air Liquide Dispositif d'agitation d'un liquide et d'injection d'un gaz dans ce liquide adapte a des bassins de faibles profondeurs
WO2009018873A1 (fr) * 2007-08-09 2009-02-12 Invent Umwelt-Und Verfahrenstechnik Ag Dispositif d'agitation pour boues activées
US20090206497A1 (en) * 2008-02-15 2009-08-20 Nelson William R Liquid waste aeration system and method
US8387957B2 (en) * 2009-01-29 2013-03-05 Aqua-Aerobic Systems, Inc. Downflow mixers with gas injection devices and/or baffles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4290885A (en) * 1977-12-22 1981-09-22 Dochan Kwak Aeration device
US4265739A (en) * 1979-01-23 1981-05-05 Dalton Robert W Flotation machines and components thereof
US4310437A (en) * 1979-09-25 1982-01-12 Bergwerksverband Gmbh Foam breaker for gas/liquid reactors
US4818404A (en) * 1987-07-08 1989-04-04 Tri-Bio, Inc. Submerged biological wastewater treatment system
US6460830B1 (en) * 1997-01-08 2002-10-08 Carbofil International Device for stirring and aerating a liquid and eliminating foam in a tank for treating said liquid
US6270061B1 (en) * 1998-10-09 2001-08-07 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device for agitating a liquid in a reactor and for injecting a gas into this liquid
US6142458A (en) * 1998-10-29 2000-11-07 General Signal Corporation Mixing system for dispersion of gas into liquid media
US6109449A (en) * 1998-11-04 2000-08-29 General Signal Corporation Mixing system for separation of materials by flotation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100187701A1 (en) * 2009-01-29 2010-07-29 Aqua-Aerobic Systems, Inc. Downflow mixers with gas injection devices and/or baffles
US8387957B2 (en) 2009-01-29 2013-03-05 Aqua-Aerobic Systems, Inc. Downflow mixers with gas injection devices and/or baffles
US10202296B2 (en) * 2013-07-18 2019-02-12 Sun Won Jang Aeration device
US10683221B2 (en) 2017-12-14 2020-06-16 L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Gas injection and recycling apparatus and methods
CN114751532A (zh) * 2022-03-18 2022-07-15 华夏中然生态科技集团有限公司 一种污水处理用增氧型曝气设备及其方法

Also Published As

Publication number Publication date
EP1716916B1 (fr) 2007-12-12
EP1716916A1 (fr) 2006-11-02
DE602006000311D1 (de) 2008-01-24
ATE380579T1 (de) 2007-12-15
CA2542729A1 (fr) 2006-10-19
FR2884442A1 (fr) 2006-10-20
ES2297819T3 (es) 2008-05-01
CA2542729C (fr) 2013-06-04
US20130127073A1 (en) 2013-05-23
US8308143B2 (en) 2012-11-13
DE602006000311T2 (de) 2008-12-04
US20120206990A1 (en) 2012-08-16
FR2884442B1 (fr) 2007-05-25

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHEVALIER, GILBERT;VILLERMET, ALAIN;LARQUET, CHRISTIAN;REEL/FRAME:018111/0813;SIGNING DATES FROM 20060331 TO 20060406

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