FR2859645A1 - Method of improving the gas injection capacity of a device agitating a liquid and injecting a gas into the liquid - Google Patents

Method of improving the gas injection capacity of a device agitating a liquid and injecting a gas into the liquid Download PDF

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Publication number
FR2859645A1
FR2859645A1 FR0350552A FR0350552A FR2859645A1 FR 2859645 A1 FR2859645 A1 FR 2859645A1 FR 0350552 A FR0350552 A FR 0350552A FR 0350552 A FR0350552 A FR 0350552A FR 2859645 A1 FR2859645 A1 FR 2859645A1
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France
Prior art keywords
gas
liquid
injecting
turbine
injection
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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Withdrawn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
FR0350552A
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French (fr)
Inventor
Philippe Campo
Jerome Cluzeau
Gilbert Chevalier
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA 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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Priority to FR0350552A priority Critical patent/FR2859645A1/en
Publication of FR2859645A1 publication Critical patent/FR2859645A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • 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
    • C02F3/20—Activated sludge processes using diffusers
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
    • C12M27/02—Stirrer or mobile mixing elements
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
    • C12M29/06—Nozzles; Sprayers; Spargers; Diffusers
    • 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

Abstract

The device creates a dispersion of gas in the liquid. Means of producing an emulsion of gas in the liquid are placed in the dispersion created by the device agitating the liquid and injecting the gas into the liquid. The means of producing an emulsion of the gas in the liquid are a porous diffuser, a gas ejector or a membrane. The device for agitating the liquid and injecting the gas are a venturi fed by a pump and means of injecting the gas into the narrow part of the venturi, or a turbine and means of injecting the gas into the turbine, or a self-blowing turbine and a helix both carried on the same hollow driving axle and the hollow axle supplies the gas to the turbine.

Description

La présente invention concerne un procédé d'amélioration d'un dispositifThe present invention relates to a method of improving a device

d'agitation d'un liquide et d'injection d'un gaz dans ce liquide de manière à améliorer sa  agitating a liquid and injecting a gas into the liquid so as to improve its

capacité d'injection du gaz dans le liquide Les traitements biologiques aérobie d'effluents consistent généralement à mettre en contact ces effluents avec une biomasse (micro-organismes) qui dégrade la pollution contenue dans ceux-ci en transformant les molécules organiques en minéraux. II est connu d'injecter un gaz généralement oxygéné dans les effluents contenus dans un bassin de manière à alimenter la biomasse. Dans ce but, de nombreux dispositifs d'injection de gaz dans les effluents existent. Ils assurent également généralement l'agitation des effluents, l'injection combinée à l'agitation permettant la dissolution du gaz oxygéné dans l'effluent. Cette dissolution est mesurée par la capacité de transfert du dispositif. Pour la plupart de ces dispositifs d'agitation et d'injection du gaz dans le liquide, une partie du transfert du gaz dans le liquide est réalisée par un moyen de mélange gaz/liquide, tel qu'un venturi ou une turbine, formant une émulsion du gaz dans le liquide et le reste du transfert est obtenu lors de la dispersion de ladite émulsion dans le liquide.  gas injection capacity in the liquid The aerobic biological treatment of effluents generally consists in putting these effluents in contact with a biomass (micro-organisms) which degrades the pollution contained in them by transforming the organic molecules into minerals. It is known to inject a generally oxygenated gas into the effluents contained in a basin so as to feed the biomass. For this purpose, numerous gas injection devices in the effluents exist. They also generally ensure the agitation of the effluents, the injection combined with agitation for the dissolution of the oxygenated gas in the effluent. This dissolution is measured by the transfer capacity of the device. For most of these devices for stirring and injecting the gas into the liquid, part of the transfer of the gas into the liquid is carried out by a gas / liquid mixing means, such as a venturi or a turbine, forming a emulsion of the gas in the liquid and the remainder of the transfer is obtained during the dispersion of said emulsion in the liquid.

II a été observé que la plupart de ces dispositifs d'agitation et d'injection présentaient une limite de capacité d'injection: passé un certain débit d'injection de gaz, le dispositif s'engorge car, au niveau du moyen d'injection du gaz dans le liquide, le volume de gaz devient trop important par rapport au volume de liquide. Alors qu'il serait possible de transférer et dissoudre plus de gaz dans le liquide contenu dans le bassin de traitement, le dispositif ne peut apporter toute la quantité de gaz nécessaire.  It has been observed that most of these stirring and injection devices have an injection capacity limit: after a certain gas injection flow rate, the device is loaded because, at the level of the injection means gas in the liquid, the volume of gas becomes too large compared to the volume of liquid. While it would be possible to transfer and dissolve more gas in the liquid contained in the treatment basin, the device can not provide all the necessary amount of gas.

La présente invention a pour but d'améliorer la capacité d'injection du gaz dans le liquide des dispositifs d'agitation et d'injection de gaz dans un liquide communément utilisés, notamment sans modification de ces dispositifs.  The present invention aims to improve the gas injection capacity in the liquid of the stirring devices and gas injection into a liquid commonly used, especially without modification of these devices.

Dans ce but, l'invention concerne un procédé d'augmentation de la capacité d'injection d'un gaz dans un liquide produite par un dispositif d'agitation du liquide et d'injection du gaz dans le liquide, ledit dispositif créant une dispersion du gaz dans le liquide, au cours duquel un moyen de production d'une émulsion du gaz est placé dans la dispersion créée par le dispositif d'agitation du liquide et d'injection du gaz dans le liquide. L'invention consiste donc à améliorer la capacité d'injection d'un dispositif qui permet à la fois d'agiter un liquide et d'introduire un gaz dans ce liquide, cette agitation et cette injection assurant la dissolution du gaz dans le liquide. L'injection et l'agitation produisent une dispersion du gaz dans le liquide. Cette dispersion est constituée de bulles de gaz en déplacement dans le bassin de traitement. Selon l'invention, la mise en place d'un moyen de production d'une émulsion du gaz dans le flux de diffusion de la dispersion permet d'augmenter la capacité d'injection du dispositif d'agitation et d'injection. Le moyen de production de l'émulsion du gaz dans le liquide peut être choisi parmi un diffuseur poreux, un éjecteur de gaz ou une membrane. L'éjecteur de gaz permet de créer un jet de gaz sous pression. Il présente l'avantage d'éviter tout colmatage.  For this purpose, the invention relates to a process for increasing the injection capacity of a gas into a liquid produced by a device for agitating the liquid and injecting the gas into the liquid, said device creating a dispersion gas in the liquid, wherein a means for producing a gas emulsion is placed in the dispersion created by the liquid stirring device and injecting the gas into the liquid. The invention therefore consists in improving the injection capacity of a device that allows both to stir a liquid and to introduce a gas into the liquid, this agitation and this injection ensuring the dissolution of the gas in the liquid. Injection and agitation produce a dispersion of the gas in the liquid. This dispersion consists of gas bubbles moving in the treatment basin. According to the invention, the establishment of a means for producing a gas emulsion in the diffusion flux of the dispersion makes it possible to increase the injection capacity of the stirring and injection device. The means for producing the gas emulsion in the liquid may be chosen from a porous diffuser, a gas ejector or a membrane. The gas ejector creates a jet of gas under pressure. It has the advantage of avoiding any clogging.

Selon un premier mode, l'invention s'applique à l'amélioration du procédé d'injection d'un dispositif d'agitation du liquide et d'injection du gaz dans le liquide composé d'un venturi alimenté par une pompe et d'un moyen d'injection de gaz dans la partie étroite du venturi. La pompe permet de faire circuler le liquide dans le venturi et le moyen d'injection de gaz assure l'injection du gaz dans le courant de liquide créé par le venturi et la pompe. Le moyen d'injection de gaz peut être, par exemple, une conduite de gaz débouchant sur une pluralité circonférentielle de trous percés dans le venturi. Il se produit alors une dispersion du gaz dans le liquide qui est diffusée dans le bassin de traitement. Cette diffusion peut être améliorée par l'intermédiaire de tuyères et d'éjecteurs placés après le venturi dans le sens du courant du liquide. Ce type d'appareil est commercialisé par Air Liquide sous la référence Ventoxalo. Pour améliorer la capacité d'injection du dispositif, un moyen de formation d'une émulsion gaz/liquide est de préférence placé après le venturi ou à la sortie des tuyères ou des éjecteurs s'il en existe. Dans ce dernier cas, le moyen de formation de l'émulsion est placée en-dessous des tuyères ou des éjecteurs.  According to a first embodiment, the invention applies to the improvement of the method of injecting a device for agitating the liquid and for injecting the gas into the liquid composed of a venturi fed by a pump and of a gas injection means in the narrow part of the venturi. The pump makes it possible to circulate the liquid in the venturi and the gas injection means ensures the injection of the gas into the liquid stream created by the venturi and the pump. The gas injection means may be, for example, a gas conduit opening on a circumferential plurality of holes drilled in the venturi. There is then a dispersion of the gas in the liquid which is diffused in the treatment basin. This diffusion can be improved by means of nozzles and ejectors placed after the venturi in the direction of the flow of the liquid. This type of device is marketed by Air Liquide under the reference Ventoxalo. To improve the injection capacity of the device, a means for forming a gas / liquid emulsion is preferably placed after the venturi or at the outlet of the nozzles or ejectors if there are any. In the latter case, the means for forming the emulsion is placed below the nozzles or ejectors.

Selon un deuxième mode, l'invention s'applique à l'amélioration du procédé d'injection d'un dispositif d'agitation du liquide et d'injection du gaz dans le liquide est composé d'une turbine et d'un moyen d'injection de gaz dans la turbine. Selon une variante préférée, ce dispositif est composé d'une turbine auto-aspirante et d'une hélice, ladite turbine auto-aspirante et ladite hélice étant portées par un même arbre d'entraînement creux, et ledit arbre creux assurant l'approvisionnement en gaz de la turbine. Plus précisément, ce type de dispositif comprend un dispositif d'entraînement placé au-dessus du liquide à agiter et pourvu d'un arbre équipé à son extrémité inférieure d'au moins un mobile à flux axial immergé dans le liquide. L'arbre porte également la turbine auto-aspirante immergée dans le liquide et pouvant être entraînée par l'arbre. L'arbre est enveloppé coaxialement par un cylindre lié à son extrémité supérieure de manière étanche au dispositif d'entraînement et dont l'extrémité inférieure débouche dans la turbine. L'extrémité supérieure du cylindre est percée d'une ouverture d'injection du gaz dans un intervalle annulaire délimité par l'arbre et le cylindre. Lors du fonctionnement de ce dispositif, le liquide est brassé par la turbine. En tournant, celle-ci aspire le gaz à travers l'espace annulaire de l'arbre et le diffuse dans le liquide au niveau de la turbine. La dispersion gaz/liquide ainsi créée est diffusée très largement dans le bassin d'aération par l'intermédiaire de la turbine et de l'hélice placée généralement sous ladite turbine. Ce moyen d'injection est décrit dans la demande EPAl-O 995 485. Ce type d'appareil est commercialisé par Air Liquide sous la référence Turboxal . Pour améliorer la capacité d'injection du gaz dans ce dispositif, un moyen de formation d'une émulsion gaz/liquide est de préférence placé dans le flux de diffusion de la dispersion créée par le dispositif, de préférence dans l'axe de la turbine.  According to a second embodiment, the invention applies to the improvement of the method of injecting a device for agitating the liquid and injecting the gas into the liquid, which is composed of a turbine and a means for injection of gas into the turbine. According to a preferred variant, this device is composed of a self-suction turbine and a propeller, said self-suction turbine and said propeller being carried by the same hollow drive shaft, and said hollow shaft ensuring the supply of gas turbine. More specifically, this type of device comprises a drive device placed above the liquid to be agitated and provided with a shaft equipped at its lower end with at least one mobile axial flow immersed in the liquid. The shaft also carries the self-suction turbine immersed in the liquid and can be driven by the shaft. The shaft is coaxially wrapped by a cylinder connected at its upper end sealingly to the drive device and whose lower end opens into the turbine. The upper end of the cylinder is pierced with a gas injection opening in an annular gap defined by the shaft and the cylinder. During operation of this device, the liquid is stirred by the turbine. By turning, it sucks the gas through the annular space of the shaft and diffuses it into the liquid at the turbine. The gas / liquid dispersion thus created is diffused very widely in the aeration basin via the turbine and the propeller placed generally under said turbine. This injection means is described in application EP-A-0 995 485. This type of apparatus is marketed by Air Liquide under the reference Turboxal. To improve the gas injection capacity in this device, a means for forming a gas / liquid emulsion is preferably placed in the diffusion flux of the dispersion created by the device, preferably in the axis of the turbine. .

Le premier et le second mode de l'invention ont été mis en oeuvre avec un gaz oxygéné et de l'eau. Un diffuseur poreux a été placé dans le flux de la dispersion aqueuse sortant des dispositifs d'agitation et d'injection selon ces deux modes. Ainsi, il a été possible d'augmenter de 5 à 30 m3lh la capacité d'injection du gaz oxygéné dans l'eau des dispositifs d'agitation et d'injection, tout en conservant la même valeur de rendement de transfert.  The first and second modes of the invention were implemented with an oxygenated gas and water. A porous diffuser was placed in the flow of the aqueous dispersion leaving the stirring and injection devices in these two modes. Thus, it has been possible to increase from 5 to 30 m3lh the injection capacity of the oxygenated gas into the water of the stirring and injection devices, while maintaining the same value of transfer efficiency.

Claims (5)

REVENDICATIONS 1. Procédé d'augmentation de la capacité d'injection d'un gaz dans un liquide produite par un dispositif d'agitation du liquide et d'injection du gaz dans le liquide, ledit dispositif créant une dispersion du gaz dans le liquide, caractérisé en ce qu'un moyen de production d'une émulsion du gaz est placé dans la dispersion créée par le dispositif d'agitation du liquide et d'injection du gaz dans le liquide.  A method of increasing the injection capacity of a gas into a liquid produced by a device for agitating the liquid and injecting the gas into the liquid, said device creating a dispersion of the gas in the liquid, characterized in that a means for producing a gas emulsion is placed in the dispersion created by the device for agitating the liquid and injecting the gas into the liquid. 2. Procédé selon la revendication 1, caractérisé en ce que le moyen de production de l'émulsion du gaz dans le liquide est choisi parmi un diffuseur poreux, un éjecteur de gaz ou une membrane.  2. Method according to claim 1, characterized in that the means for producing the gas emulsion in the liquid is selected from a porous diffuser, a gas ejector or a membrane. 3. Procédé selon l'une des revendications précédentes, caractérisé en ce que le dispositif d'agitation du liquide et d'injection du gaz dans le liquide est composé d'un venturi alimenté par une pompe et d'un moyen d'injection de gaz dans la partie étroite du venturi.  3. Method according to one of the preceding claims, characterized in that the device for stirring the liquid and injecting the gas into the liquid is composed of a venturi fed by a pump and a means of injection of gas in the narrow part of the venturi. 4. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que le dispositif d'agitation du liquide et d'injection du gaz dans le liquide est composé d'une turbine et d'un moyen d'injection de gaz dans la turbine.  4. Method according to one of claims 1 or 2, characterized in that the device for stirring the liquid and injecting the gas into the liquid is composed of a turbine and a gas injection means in the turbine. 5. Procédé selon la revendication 4, caractérisé en ce que le dispositif d'agitation du liquide et d'injection du gaz dans le liquide est composé d'une turbine auto-aspirante et d'une hélice, ladite turbine autoaspirante et ladite hélice étant portées par un même arbre d'entraînement creux, et ledit arbre creux assurant l'approvisionnement en gaz de la turbine.  5. Method according to claim 4, characterized in that the device for stirring the liquid and injecting the gas into the liquid is composed of a self-suction turbine and a propeller, said self-aspirating turbine and said propeller being carried by the same hollow drive shaft, and said hollow shaft providing gas supply to the turbine.
FR0350552A 2003-09-17 2003-09-17 Method of improving the gas injection capacity of a device agitating a liquid and injecting a gas into the liquid Withdrawn FR2859645A1 (en)

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FR0350552A FR2859645A1 (en) 2003-09-17 2003-09-17 Method of improving the gas injection capacity of a device agitating a liquid and injecting a gas into the liquid

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03266974A (en) * 1990-03-16 1991-11-27 Hitachi Ltd Incubator
JPH05123080A (en) * 1991-05-02 1993-05-21 Kuroki Shigemitsu Aeration device also used for producing liquid flow
US5643503A (en) * 1995-04-03 1997-07-01 Roland; Jean-Louis Device for introducing a gas into a liquid
US5925290A (en) * 1997-08-08 1999-07-20 Rhone-Poulenc Inc. Gas-liquid venturi mixer
EP0995485A1 (en) * 1998-10-09 2000-04-26 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Apparatus for stirring a liquid in a reactor and for injecting a gas in this liquid
US20020110508A1 (en) * 2000-12-20 2002-08-15 Philippe Campo Oxidation process of the wet oxidation or ozonization type
JP2003190753A (en) * 2001-12-27 2003-07-08 Tekku Kogyo Kk Fine air bubble feeder

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03266974A (en) * 1990-03-16 1991-11-27 Hitachi Ltd Incubator
JPH05123080A (en) * 1991-05-02 1993-05-21 Kuroki Shigemitsu Aeration device also used for producing liquid flow
US5643503A (en) * 1995-04-03 1997-07-01 Roland; Jean-Louis Device for introducing a gas into a liquid
US5925290A (en) * 1997-08-08 1999-07-20 Rhone-Poulenc Inc. Gas-liquid venturi mixer
EP0995485A1 (en) * 1998-10-09 2000-04-26 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Apparatus for stirring a liquid in a reactor and for injecting a gas in this 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
US20020110508A1 (en) * 2000-12-20 2002-08-15 Philippe Campo Oxidation process of the wet oxidation or ozonization type
JP2003190753A (en) * 2001-12-27 2003-07-08 Tekku Kogyo Kk Fine air bubble feeder

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0160, no. 76 (C - 0914) 25 February 1992 (1992-02-25) *
PATENT ABSTRACTS OF JAPAN vol. 0174, no. 82 (C - 1105) 2 September 1993 (1993-09-02) *
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 11 5 November 2003 (2003-11-05) *

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