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EP0687497A1 - Liquid aerator and stirring device, for example for fatty affluents - Google Patents

Liquid aerator and stirring device, for example for fatty affluents Download PDF

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Publication number
EP0687497A1
EP0687497A1 EP95401088A EP95401088A EP0687497A1 EP 0687497 A1 EP0687497 A1 EP 0687497A1 EP 95401088 A EP95401088 A EP 95401088A EP 95401088 A EP95401088 A EP 95401088A EP 0687497 A1 EP0687497 A1 EP 0687497A1
Authority
EP
European Patent Office
Prior art keywords
chimney
liquid
shaft
vortex
tank
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Withdrawn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
EP95401088A
Other languages
German (de)
French (fr)
Inventor
Alain Boulant
Daniel Villessot
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.)
D'AMENAGEMENT URBAIN ET RURAL - SAUR Ste
Original Assignee
Internationale De Services Et D'environnement Cise Internationale Cie
SERVICES ET D ENVIRONNEMENT C
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 Internationale De Services Et D'environnement Cise Internationale Cie, SERVICES ET D ENVIRONNEMENT C filed Critical Internationale De Services Et D'environnement Cise Internationale Cie
Publication of EP0687497A1 publication Critical patent/EP0687497A1/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Withdrawn legal-status Critical Current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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2334—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer
    • B01F23/23341—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer with tubes surrounding the stirrer
    • 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
    • B01F23/2336—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 location of the place of introduction of the gas relative to the stirrer
    • B01F23/23362—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 location of the place of introduction of the gas relative to the stirrer the gas being introduced under the stirrer
    • 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
    • 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/119—Stirrers with rigid wires or flexible rods
    • 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/192—Stirrers with two or more mixing elements mounted in sequence on the same axis with dissimilar 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

Definitions

  • the subject of the present invention is a device for aeration and mixing of a liquid, such as for example greasy effluents extracted from urban effluents of wastewater.
  • This purification produces by-products linked to the purification such as grease, sludge ...
  • Landfills are less and less accepting this type of product, so that wastewater treatment plants must now be able to treat them to limit them as much as possible.
  • the fat trapped at the entrance to the treatment plant is poured into a biological degradation tank, which has internally and at its lower part injection ramps in the liquid of the pressurized air.
  • the rising bubbles allow to aerate and stir the liquid naturally.
  • this type of aeration and stirring device is more particularly suitable for lightly loaded fluids, that is to say of low viscosity and its yield decreases rapidly for fluids loaded in particular with grease.
  • the object of the invention is to avoid these drawbacks by proposing a device for aeration and stirring of a liquid such as for example the greasy effluents extracted from urban effluents of wastewater which allows, by simple means and consuming little d energy, to effectively treat this kind of liquid.
  • a tank 1 provided at its upper part with an orifice 2 for entering a liquid 3 to be treated, such as for example greasy effluents extracted from urban effluents of wastewater.
  • the tank 1 is provided with at least one device for aerating and stirring the liquid 3 and generally designated by the reference 10.
  • the ventilation and stirring device 10 according to the invention arranged inside the tank 1 consists of a vertical chimney 11 extending over part of the height of said tank 1 and open at its two ends 11a and 11b.
  • the upper end 11a of the chimney 11 is provided with a funnel 12 flared upwards.
  • the upper edge 12a of the funnel 12 provides a free space 13 with the wall of the tank 1 for the passage of the liquid 3 and this upper edge 12a is situated just below the surface 3a of the liquid 3.
  • the lower end 11b of the chimney 11 provides with the bottom of the tank 1 a passage 14 for the liquid 3.
  • the assembly constituted by the chimney 11 and the funnel 12 is fixed inside the tank by suitable means not shown in FIG. 1.
  • the device also includes a vertical shaft 15 driven in rotation by a gear motor 16.
  • This shaft 15 is placed inside and extends over the entire height of the chimney 11.
  • the vertical shaft 15 rotates a propeller 18 disposed inside the chimney 11 below the upper orifice 11a of this chimney 11 for the suction of the liquid from the top to the bottom in said chimney 11.
  • the diameter of the propeller 18 is slightly less than the inside diameter of the chimney 11.
  • a first anti-vortex member 19 is disposed inside the chimney 11 below the propeller 18 to prevent the rotation of the liquid 3 in said chimney 11.
  • this anti-vortex member 19 consists of three vertical plates 19a distributed at 120 ° inside the chimney 11.
  • a second anti-vortex member 20 can also be placed above the propeller 18 in the funnel 12.
  • this anti-vortex member 20 also consists of three vertical plates 20a distributed at 120 ° inside the funnel 12.
  • the device also includes means 22 for stirring of the liquid 3 integral in rotation with the shaft 15 and disposed inside the chimney 11 below the anti-vortex member 19 relative to the direction of circulation of the liquid in the chimney 11.
  • the means 22 for stirring the liquid 3 are formed by several filiform members 23 each forming an arc in a substantially vertical plane and distributed over at least part of the length of said shaft 15 between the anti-vortex member 19 and the lower end 11b of the chimney 11.
  • the filiform members 23 are arranged over the entire length of the shaft 15 between the anti-vortex member 19 and the lower end 11b of the chimney 11.
  • the filiform members 23 can be arranged in the same vertical plane or staggered.
  • each filiform member 23 is formed by a cable 24, the two ends of which are integral with the shaft 15.
  • each filiform member 23 is formed by a rod 25 of which only the end 25a located highest on the shaft 15 is fixed on the latter so as to avoid the hanging of tows inside the chimney 11.
  • Each filiform member 23 has any cross section and preferably circular with a diameter between 3 to 5 mm.
  • the device also comprises means 27 for injecting a pressurized gas such as, for example, air into the chimney 11 below the anti-vortex member 19.
  • a pressurized gas such as, for example, air
  • injection means 26 are formed by at at least one pipe 27 opening into the chimney 11 at a level situated between the filiform member 23 situated below the anti-vortex member 19 and the middle of the portion of the chimney 11 comprised between the first anti-vortex member 19 and the lower part 11b of the chimney 11.
  • the shaft 15 may also comprise, just below the surface 3a of the liquid 3, a member 28 for forming a vortex at the level of said surface 3a of the liquid 3 so as to promote the suction of the foam. by the propeller 18 inside said chimney 11.
  • the device which has just been described operates in the following manner.
  • the liquid 3 to be treated is poured through the orifice 2 into the tank 1 up to a level situated just above the upper edge 12a of the funnel 12.
  • the geared motor 16 rotates the shaft 15 which itself rotates the member 28, the propeller 18 and the filiform members 23.
  • the gas under pressure is injected into the chimney 11 via the conduits 27.
  • the rotation of the propeller 18 causes a suction of the liquid 3 in the chimney 11 so that this liquid 3 circulates continuously from top to bottom, in this chimney 11, then passes into the space 14 and circulates from bottom to top between said chimney 11 and the internal wall of the tank 1 and so on.
  • the anti-vortex members 19 and 20 prevent the rotation of the liquid 3 in the chimney 11.
  • the bubbles of gas under pressure disperse in the liquid 3 inside the chimney 11 and under the effect of the rotation of the filiform organs 23, the liquid 3 is stirred and the gas bubbles are divided into micro-bubbles promoting the dispersion of the gas and therefore the aeration of the liquid 3.
  • the liquid to be treated passes several times in the chimney and undergoes including several oxygenation treatments.
  • the flow rate of such a device is approximately 800m3 / hour on a pilot with a grease capacity of 17.5m3.
  • the device according to the invention applies for example to the treatment of water, urban effluents, industrial waste water, grease by biodegradation, waste materials, to the ozonation of water by an ozonated gas with or without catalyst, to stabilize sludge or can be used in thermophilic treatment.
  • This device can also be used as a reactor operating in a fluidized bed.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

An aeration/mixing system is mounted in a central cylinder in a liq. effluent tank. A rotating arm has a propeller, anti-vortex units and mixing "blades" which consist of 3-5 mm dia. cables in the form of a semi-circle. These cables ensure intimate gas/liq. contact when compressed gas is injected into the mixing section. <IMAGE>

Description

La présente invention a pour objet un dispositif d'aération et de brassage d'un liquide, comme par exemple les effluents graisseux extraits des effluents urbains d'eaux usées.The subject of the present invention is a device for aeration and mixing of a liquid, such as for example greasy effluents extracted from urban effluents of wastewater.

Comme on le sait, les effluents urbains d'eaux usées qui circulent dans les canalisations d'évacuation tels que des égouts sont recueillis dans des stations d'épuration dans lesquelles sont effectuées diverses opérations de traitement afin de les épurer avant de la renvoyer dans le milieu naturel.As is known, the urban effluents of wastewater which circulate in the evacuation pipes such as sewers are collected in treatment plants in which various treatment operations are carried out in order to purify them before returning it to the natural environment.

Cette épuration produit des sous-produits liés à l'épuration comme de la graisse, des boues...This purification produces by-products linked to the purification such as grease, sludge ...

Or, les décharges acceptent de moins en moins ce type de produits, de telle sorte que les stations d'épuration doivent être maintenant capables de les traiter pour les limiter au maximum.Landfills are less and less accepting this type of product, so that wastewater treatment plants must now be able to treat them to limit them as much as possible.

Ainsi, les graisses piégées à l'entrée de la station d'épuration sont déversées dans une cuve de dégradation biologique, qui comporte intérieurement et à sa partie inférieure des rampes d'injection dans le liquide de l'air sous pression.Thus, the fat trapped at the entrance to the treatment plant is poured into a biological degradation tank, which has internally and at its lower part injection ramps in the liquid of the pressurized air.

La remontée de bulles permet d'aérer et de brasser naturellement le liquide.The rising bubbles allow to aerate and stir the liquid naturally.

Le brassage peut être accentué en disposant à l'intérieur de la cuve un agitateur mécanique.Stirring can be accentuated by having a mechanical agitator inside the tank.

Mais, ce genre de dispositif d'aération et de brassage convient plus particulièrement pour des fluides peu chargés c'est à dire de faible viscosité et son rendement diminue rapidement pour des fluides chargés notamment en graisse.However, this type of aeration and stirring device is more particularly suitable for lightly loaded fluids, that is to say of low viscosity and its yield decreases rapidly for fluids loaded in particular with grease.

D'autre part, il se forme à la surface du liquide une couche importante de mousse qui s'envole et pollue l'environnement si bien qu'il est nécessaire de prévoir des agitateurs au niveau de la surface du liquide pour rabattre la mousse.On the other hand, a large layer of foam is formed on the surface of the liquid which flies away and pollutes the environment so that it is necessary to provide agitators at the liquid surface to reduce the foam.

L'invention a pour but d'éviter ces inconvénients en proposant un dispositif d'aération et de brassage d'un liquide comme par exemple les effluents graisseux extraits des effluents urbains d'eaux usées qui permet, par des moyens simples et consommant peu d'énergie, de traiter de manière efficace ce genre de liquide.The object of the invention is to avoid these drawbacks by proposing a device for aeration and stirring of a liquid such as for example the greasy effluents extracted from urban effluents of wastewater which allows, by simple means and consuming little d energy, to effectively treat this kind of liquid.

L'invention a donc pour objet un dispositif d'aération et de brassage d'un liquide dans une cuve, caractérisée en ce qu'il comprend à l'intérieur de ladite cuve :

  • une cheminée verticale s'étendant sur une partie de la hauteur de la cuve et ouverte à ses deux extrémités, l'extrémité inférieure de ladite cheminée ménageant avec le fond de la cuve un passage pour le liquide,
  • un arbre vertical entraîné en rotation, disposé à l'intérieur et s'étendant sur toute la hauteur de la cheminée,
  • une hélice solidaire en rotation avec l'arbre et disposée à l'intérieur de la cheminée au-dessous de l'orifice supérieur de cette cheminée pour l'aspiration du liquide du haut vers le bas dans ladite cheminée,
  • un premier organe anti-vortex disposé à l'intérieur de la cheminée au-dessous de ladite hélice,
  • des moyens de brassage du liquide solidaire en rotation avec l'arbre et disposés à l'intérieur de la cheminée et au-dessous du premier organe anti-vortex par rapport au sens de circulation dudit liquide dans ladite cheminée,
  • et des moyens d'injection d'un gaz sous pression dans la cheminée au-dessous du premier organe anti-vortex.
The subject of the invention is therefore a device for aeration and stirring of a liquid in a tank, characterized in that it comprises inside said tank:
  • a vertical chimney extending over part of the height of the tank and open at its two ends, the lower end of said chimney providing with the bottom of the tank a passage for the liquid,
  • a vertical shaft driven in rotation, arranged inside and extending over the entire height of the chimney,
  • a propeller integral in rotation with the shaft and disposed inside the chimney below the upper orifice of this chimney for the suction of the liquid from the top to the bottom in said chimney,
  • a first anti-vortex member placed inside the chimney below said propeller,
  • means for stirring the liquid integral in rotation with the shaft and arranged inside the chimney and below the first anti-vortex member with respect to the direction of circulation of said liquid in said chimney,
  • and means for injecting a pressurized gas into the chimney below the first anti-vortex member.

Selon d'autres caractéristiques de l'invention :

  • les moyens de brassage du liquide comprennent plusieurs organes filiformes formant chacun un arc dans un plan sensiblement vertical, dont au moins une extrémité est solidaire de l'arbre et disposés sur au moins une partie de la longueur dudit arbre entre le premier organe anti-vortex et l'extrémité inférieure de la cheminée,
  • les organes filiformes sont disposés sur toute la longueur de l'arbre entre le premier organe anti-vortex et l'extrémité inférieure de la cheminée,
  • chaque organe filiforme est formé par un câble dont les deux extrémités sont solidaires de l'arbre,
  • chaque organe filiforme est formé par une tige dont l'extrémité située la plus haute sur ledit arbre est fixée sur celui-ci,
  • chaque organe filiforme a une section circulaire de diamètre compris entre 3 à 5mm,
  • l'extrémité supérieure de la cheminée est pourvue d'un entonnoir évasé vers le haut, dont le bord supérieur, ménage avec la paroi de la cuve un espace libre pour le passage du liquide et est situé juste au-dessous de la surface de liquide dans la cuve,
  • la cheminée comporte un second organe anti-vortex disposé à l'intérieur de celle-ci et au-dessus de l'hélice,
  • les moyens d'injection du gaz sous pression sont formés par au moins une conduite débouchant dans la cheminée entre l'organe filiforme situé au-dessous de l'organe anti-vortex et le milieu de la portion de la cheminée comprise entre le premier organe anti-vortex et la partie inférieure de ladite cheminée,
  • l'arbre comporte, juste au-dessous de la surface du liquide, un organe pour former un vortex au niveau de la surface du liquide.
According to other characteristics of the invention:
  • the liquid stirring means comprise several filiform members each forming an arc in a substantially vertical plane, at least one end of which is integral with the shaft and arranged over at least part of the length of said shaft between the first anti-vortex member and the lower end of the chimney,
  • the filiform members are arranged over the entire length of the shaft between the first anti-vortex member and the lower end of the chimney,
  • each filiform member is formed by a cable, the two ends of which are integral with the shaft,
  • each filiform member is formed by a rod, the end of which is the highest on said shaft, and is fixed thereon,
  • each filiform member has a circular section with a diameter between 3 to 5 mm,
  • the upper end of the chimney is provided with an upwardly flared funnel, the upper edge of which, with the wall of the tank, provides a free space for the passage of the liquid and is situated just below the surface of the liquid in the tank,
  • the chimney comprises a second anti-vortex member disposed inside thereof and above the propeller,
  • the means for injecting the gas under pressure are formed by at least one pipe opening into the chimney between the filiform member situated below the anti-vortex member and the middle of the portion of the chimney comprised between the first member anti-vortex and the lower part of said chimney,
  • the tree has, just below the surface of the liquid, an organ for forming a vortex at the surface of the liquid.

D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description qui va suivre, faite en référence aux dessins annexés, sur lesquels :

  • la Fig. 1 est une vue schématique en coupe d'une cuve munie d'un dispositif d'aération et de brassage d'un liquide selon l'invention,
  • la Fig. 2 est une vue en coupe selon la ligne 2-2 de la Fig. 1,
  • la Fig. 3 est une vue en coupe selon la ligne 3-3 de la Fig.1,
  • la Fig. 4 est une vue schématique en perspective d'un premier mode de réalisation des moyens de brassage du dispositif selon l'invention,
  • la Fig. 5 est une vue schématique en perspective d'un second mode de réalisation des moyens de brassage du dispositif selon l'invention.
Other characteristics and advantages of the invention will appear during the description which follows, given with reference to the appended drawings, in which:
  • Fig. 1 is a schematic sectional view of a tank provided with a device for aerating and stirring a liquid according to the invention,
  • Fig. 2 is a sectional view along line 2-2 of FIG. 1,
  • Fig. 3 is a sectional view along line 3-3 of FIG. 1,
  • Fig. 4 is a schematic perspective view of a first embodiment of the stirring means of the device according to the invention,
  • Fig. 5 is a schematic perspective view of a second embodiment of the stirring means of the device according to the invention.

Sur la Fig. 1, on a représenté une cuve 1 munie à sa partie supérieure d'un orifice 2 d'entrée d'un liquide 3 à traiter, comme par exemple des effluents graisseux extraits des effluents urbains d'eaux usées.In Fig. 1, there is shown a tank 1 provided at its upper part with an orifice 2 for entering a liquid 3 to be treated, such as for example greasy effluents extracted from urban effluents of wastewater.

La cuve 1 est pourvue d'au moins un dispositif d'aération et de brassage du liquide 3 et désigné dans son ensemble par la référence 10.The tank 1 is provided with at least one device for aerating and stirring the liquid 3 and generally designated by the reference 10.

Le dispositif d'aération et de brassage 10 selon l'invention disposé à l'intérieur de la cuve 1 se compose d'une cheminée verticale 11 s'étendant sur une partie de la hauteur de ladite cuve 1 et ouverte à ses deux extrémités 11a et 11b.The ventilation and stirring device 10 according to the invention arranged inside the tank 1 consists of a vertical chimney 11 extending over part of the height of said tank 1 and open at its two ends 11a and 11b.

L'extrémité supérieure 11a de la cheminé 11 est munie d'un entonnoir 12 évasé vers le haut.The upper end 11a of the chimney 11 is provided with a funnel 12 flared upwards.

Le bord supérieur 12a de l'entonnoir 12 ménage avec la paroi de la cuve 1 un espace libre 13 pour le passage du liquide 3 et ce bord supérieur 12a est situé juste au-dessous de la surface 3a du liquide 3.The upper edge 12a of the funnel 12 provides a free space 13 with the wall of the tank 1 for the passage of the liquid 3 and this upper edge 12a is situated just below the surface 3a of the liquid 3.

L'extrémité inférieure 11b de la cheminée 11 ménage avec le fond de la cuve 1 un passage 14 pour le liquide 3.The lower end 11b of the chimney 11 provides with the bottom of the tank 1 a passage 14 for the liquid 3.

L'ensemble constitué par la cheminée 11 et l'entonnoir 12 est fixé à l'intérieur de la cuve par des moyens appropriés non représentés sur la Fig. 1.The assembly constituted by the chimney 11 and the funnel 12 is fixed inside the tank by suitable means not shown in FIG. 1.

Le dispositif comporte également un arbre vertical 15 entraîné en rotation par un moto-réducteur 16.The device also includes a vertical shaft 15 driven in rotation by a gear motor 16.

Cet arbre 15 est disposé à l'intérieur et s'étend sur toute la hauteur de la cheminée 11.This shaft 15 is placed inside and extends over the entire height of the chimney 11.

L'arbre vertical 15 entraîne en rotation une hélice 18 disposée à l'intérieur de la cheminée 11 au-dessous de l'orifice supérieure 11a de cette cheminée 11 pour l'aspiration du liquide du haut vers le bas dans ladite cheminée 11.The vertical shaft 15 rotates a propeller 18 disposed inside the chimney 11 below the upper orifice 11a of this chimney 11 for the suction of the liquid from the top to the bottom in said chimney 11.

Le diamètre de l'hélice 18 est légèrement inférieur au diamètre intérieur de la cheminée 11.The diameter of the propeller 18 is slightly less than the inside diameter of the chimney 11.

Un premier organe anti-vortex 19 est disposé à l'intérieur de la cheminée 11 au-dessous de l'hélice 18 pour éviter la rotation du liquide 3 dans ladite cheminée 11.A first anti-vortex member 19 is disposed inside the chimney 11 below the propeller 18 to prevent the rotation of the liquid 3 in said chimney 11.

Ainsi que représenté à la Fig. 2, cet organe anti-vortex 19 est constitué par trois plaques verticales 19a réparties à 120° à l'intérieur de la cheminée 11.As shown in FIG. 2, this anti-vortex member 19 consists of three vertical plates 19a distributed at 120 ° inside the chimney 11.

Un second organe anti-vortex 20 peut également être disposé au-dessus de l'hélice 18 dans l'entonnoir 12.A second anti-vortex member 20 can also be placed above the propeller 18 in the funnel 12.

Comme représenté à la Fig.3, cet organe anti-vortex 20 est également constitué de trois plaques verticales 20a réparties à 120° à l'intérieur de l'entonnoir 12.As shown in FIG. 3, this anti-vortex member 20 also consists of three vertical plates 20a distributed at 120 ° inside the funnel 12.

Le dispositif comporte aussi des moyens 22 de brassage du liquide 3 solidaires en rotation avec l'arbre 15 et disposé à l'intérieur de la cheminée 11 au-dessous de l'organe anti-vortex 19 par rapport au sens de circulation du liquide dans la cheminée 11.The device also includes means 22 for stirring of the liquid 3 integral in rotation with the shaft 15 and disposed inside the chimney 11 below the anti-vortex member 19 relative to the direction of circulation of the liquid in the chimney 11.

Comme illustré à la Fig. 1, les moyens 22 de brassage du liquide 3 sont formés par plusieurs organes filiformes 23 formant chacun un arc dans un plan sensiblement vertical et répartis sur au moins une partie de la longueur dudit arbre 15 entre l'organe anti-vortex 19 et l'extrémité inférieure 11b de la cheminée 11.As illustrated in Fig. 1, the means 22 for stirring the liquid 3 are formed by several filiform members 23 each forming an arc in a substantially vertical plane and distributed over at least part of the length of said shaft 15 between the anti-vortex member 19 and the lower end 11b of the chimney 11.

De préférence, les organes filiformes 23 sont disposés sur toute la longueur de l'arbre 15 entre l'organe anti-vortex 19 et l'extrémité inférieure 11b de la cheminée 11.Preferably, the filiform members 23 are arranged over the entire length of the shaft 15 between the anti-vortex member 19 and the lower end 11b of the chimney 11.

Les organes filiformes 23 peuvent être disposés dans un même plan vertical ou disposés en quinconce.The filiform members 23 can be arranged in the same vertical plane or staggered.

Selon un premier mode de réalisation représenté à la Fig. 4, chaque organe filiforme 23 est formé par un câble 24 dont les deux extrémités sont solidaires de l'arbre 15.According to a first embodiment shown in FIG. 4, each filiform member 23 is formed by a cable 24, the two ends of which are integral with the shaft 15.

Selon un second mode de réalisation représenté à la Fig.5, chaque organe filiforme 23 est formé par une tige 25 dont seulement l'extrémité 25a située la plus haute sur l'arbre 15 est fixée sur celui-ci de façon à éviter l'accrochage des filasses à l'intérieur de la cheminée 11.According to a second embodiment shown in Fig.5, each filiform member 23 is formed by a rod 25 of which only the end 25a located highest on the shaft 15 is fixed on the latter so as to avoid the hanging of tows inside the chimney 11.

Chaque organe filiforme 23 a une section quelconque et de préférence circulaire de diamètre compris entre 3 à 5mm.Each filiform member 23 has any cross section and preferably circular with a diameter between 3 to 5 mm.

Le dispositif comporte également des moyens 27 d'injection d'un gaz sous pression comme par exemple de l'air dans la cheminée 11 au-dessous de l'organe anti-vortex 19.The device also comprises means 27 for injecting a pressurized gas such as, for example, air into the chimney 11 below the anti-vortex member 19.

Ces moyens d'injection 26 sont formés par au moins une conduite 27 débouchant dans la cheminée 11 à un niveau situé entre l'organe filiforme 23 situé au-dessous de l'organe anti-vortex 19 et le milieu de la portion de la cheminée 11 comprise entre le premier organe anti-vortex 19 et la partie inférieure 11b de la cheminée 11.These injection means 26 are formed by at at least one pipe 27 opening into the chimney 11 at a level situated between the filiform member 23 situated below the anti-vortex member 19 and the middle of the portion of the chimney 11 comprised between the first anti-vortex member 19 and the lower part 11b of the chimney 11.

D'autre part, l'arbre 15 peut également comporter, juste au-dessous de la surface 3a du liquide 3 un organe 28 pour former un vortex au niveau de ladite surface 3a du liquide 3 de façon à favoriser l'aspiration de la mousse par l'hélice 18 à l'intérieur de ladite cheminée 11.On the other hand, the shaft 15 may also comprise, just below the surface 3a of the liquid 3, a member 28 for forming a vortex at the level of said surface 3a of the liquid 3 so as to promote the suction of the foam. by the propeller 18 inside said chimney 11.

Le dispositif qui vient d'être décrit fonctionne de la manière suivante.The device which has just been described operates in the following manner.

Le liquide 3 à traiter est déversé par l'orifice 2 dans la cuve 1 jusqu'à à un niveau situé juste au-dessus du bord supérieur 12a de l'entonnoir 12.The liquid 3 to be treated is poured through the orifice 2 into the tank 1 up to a level situated just above the upper edge 12a of the funnel 12.

Ensuite, le moto-réducteur 16 entraîne en rotation l'arbre 15 qui lui même entraîne en rotation l'organe 28, l'hélice 18 et les organes filiformes 23.Then, the geared motor 16 rotates the shaft 15 which itself rotates the member 28, the propeller 18 and the filiform members 23.

Simultanément, le gaz sous pression est injecté dans la cheminée 11 par l'intermédiaire des conduites 27.Simultaneously, the gas under pressure is injected into the chimney 11 via the conduits 27.

La rotation de l'hélice 18 provoque une aspiration du liquide 3 dans la cheminée 11 de telle sorte que ce liquide 3 circule en continu de haut en bas, dans cette cheminée 11, puis passe dans l'espace 14 et circule de bas en haut entre ladite cheminée 11 et la paroi interne de la cuve 1 et ainsi de suite.The rotation of the propeller 18 causes a suction of the liquid 3 in the chimney 11 so that this liquid 3 circulates continuously from top to bottom, in this chimney 11, then passes into the space 14 and circulates from bottom to top between said chimney 11 and the internal wall of the tank 1 and so on.

Les organes anti-vortex 19 et 20 empêche la rotation du liquide 3 dans la cheminée 11.The anti-vortex members 19 and 20 prevent the rotation of the liquid 3 in the chimney 11.

Les bulles de gaz sous pression se dispersent dans le liquide 3 à l'intérieur de la cheminée 11 et sous l'effet de la rotation des organes filiformes 23, le liquide 3 est brassé et les bulles de gaz se divisent en micro-bulles favorisant la dispersion du gaz et de ce fait l'aération du liquide 3.The bubbles of gas under pressure disperse in the liquid 3 inside the chimney 11 and under the effect of the rotation of the filiform organs 23, the liquid 3 is stirred and the gas bubbles are divided into micro-bubbles promoting the dispersion of the gas and therefore the aeration of the liquid 3.

Entre la paroi interne de la cuve 1 et la cheminée 11, les bulles de gaz accélèrent la remontée du liquide favorisant la circulation de ce liquide à l'intérieur de la cuve ce qui permet d'améliorer le rendement.Between the internal wall of the tank 1 and the chimney 11, the gas bubbles accelerate the ascent of the liquid favoring the circulation of this liquid inside the tank, which improves the yield.

Ainsi, le liquide à traiter passe plusieurs foi dans la cheminée et subit dont plusieurs traitements d'oxygénation.Thus, the liquid to be treated passes several times in the chimney and undergoes including several oxygenation treatments.

De plus, les boues et la mousse flottant à la surface du liquide sont elles aussi aspirées à l'intérieure de la cheminée et sont donc traitées.In addition, the sludge and foam floating on the surface of the liquid are also sucked inside the chimney and are therefore treated.

Le débit d'un tel dispositif est d'environ de 800m³/heure sur un pilote d'une capacité de graisse de 17,5m³.The flow rate of such a device is approximately 800m³ / hour on a pilot with a grease capacity of 17.5m³.

Le dispositif selon l'invention s'applique par exemple au traitement de l'eau, des effluents urbains, des eaux usées industrielles, des graisses par biodégradation, des matières de vidange, à l'ozonation de l'eau par un gaz ozoné avec ou sans catalyseur, à la stabilisation des boues ou peut être utilisé en traitement thermophile.The device according to the invention applies for example to the treatment of water, urban effluents, industrial waste water, grease by biodegradation, waste materials, to the ozonation of water by an ozonated gas with or without catalyst, to stabilize sludge or can be used in thermophilic treatment.

Ce dispositif peut également être utilisé comme réacteur fonctionnant en lit fluidisé.This device can also be used as a reactor operating in a fluidized bed.

Claims (10)

Dispositif d'aération et de brassage d'un liquide dans une cuve (1), caractérisé en ce qu'il comprend à l'intérieur de la cuve (1) : - une cheminée verticale (11) s'étendant sur une partie de la hauteur de la cuve (1) et ouverte à ses deux extrémités (11a, 11b), l'extrémité inférieure (11b) de ladite cheminée (11) ménageant avec le fond de la cuve (1) un passage (14) pour le liquide, - un arbre vertical (15) entraîné en rotation, disposé à l'intérieur et s'étendant sur toute la hauteur de la cheminée (11), - une hélice (18) solidaire en rotation de l'arbre (15) et disposée à l'intérieur de la cheminée (11) au-dessous de l'orifice supérieur (11a) de cette cheminée (11) pour l'aspiration du liquide du haut vers le bas dans ladite cheminée (11), - un premier organe anti-vortex (19) disposé à l'intérieur de la cheminée (11) au-dessous de ladite hélice (18), - des moyens (22) de brassage du liquide solidaire en rotation avec l'arbre (15) et disposés à l'intérieur de la cheminée (11) et au-dessous du premier organe anti-vortex (19) par rapport au sens de circulation du liquide dans ladite cheminée (11), - et des moyens (26) d'injection d'un gaz sous pression dans la cheminée (11) au-dessous du premier organe anti-vortex (19). Device for aeration and stirring of a liquid in a tank (1), characterized in that it includes inside the tank (1): - A vertical chimney (11) extending over part of the height of the tank (1) and open at its two ends (11a, 11b), the lower end (11b) of said chimney (11) providing with the bottom of the tank (1) a passage (14) for the liquid, - a vertical shaft (15) driven in rotation, arranged inside and extending over the entire height of the chimney (11), - A propeller (18) integral in rotation with the shaft (15) and disposed inside the chimney (11) below the upper orifice (11a) of this chimney (11) for the suction of the liquid from top to bottom in said chimney (11), - a first anti-vortex member (19) disposed inside the chimney (11) below said propeller (18), - Means (22) for stirring the liquid integral in rotation with the shaft (15) and arranged inside the chimney (11) and below the first anti-vortex member (19) relative to the direction of circulation of the liquid in said chimney (11), - And means (26) for injecting a pressurized gas into the chimney (11) below the first anti-vortex member (19). Dispositif selon la revendication 1, caractérisé en ce que les moyens (22) de brassage du liquide comprennent plusieurs organes filiformes (23) formant chacun un arc dans un plan sensiblement vertical dont au moins une extrémité est solidaire de l'arbre (15) et répartis sur au moins une partie de la longueur dudit arbre (15) entre le premier organe anti-vortex (19) et l'extrémité inférieure (11b) de la cheminée (11).Device according to claim 1, characterized in that the means (22) for stirring the liquid comprise several filiform members (23) each forming an arc in a substantially vertical plane of which at least one end is integral with the shaft (15) and distributed over at least part of the length of said shaft (15) between the first anti-vortex member (19) and the lower end (11b) of the chimney (11). Dispositif selon la revendication 2, caractérisé en ce que les organes filiformes (23) sont disposés sur toute la longueur de l'arbre (15) entre le premier organe anti-vortex (19) et l'extrémité inférieure (11b) de la cheminée (11).Device according to claim 2, characterized in that the filiform members (23) are arranged over the entire length of the shaft (15) between the first anti-vortex member (19) and the lower end (11b) of the chimney (11). Dispositif selon les revendications 2 et 3, caractérisé en ce que chaque organe filiforme (23) est formé par un câble (24) dont les deux extrémités sont solidaires de l'arbre (15).Device according to claims 2 and 3, characterized in that each filiform member (23) is formed by a cable (24), the two ends of which are integral with the shaft (15). Dispositif selon les revendications 2 et 3, caractérisé en ce que chaque organe filiforme (23) est formé par une tige (25) dont l'extrémité (25a) située la plus haute sur ledit arbre (15) est fixée sur celui-ci.Device according to claims 2 and 3, characterized in that each filiform member (23) is formed by a rod (25) whose end (25a) located highest on said shaft (15) is fixed thereon. Dispositif selon l'une des revendications 2 à 5, caractérisé en ce que chaque organe filiforme (23) a une section circulaire de diamètre comprise entre 3 à 5mm.Device according to one of claims 2 to 5, characterized in that each filiform member (23) has a circular section of diameter between 3 to 5mm. Dispositif selon la revendication 1, caractérisé en ce que l'extrémité supérieure (11a) de la cheminée (11) est pourvue d'un entonnoir (12) évasé vers le haut, dont le bord supérieur (12a) ménage, avec la paroi de la cuve (1), un espace libre (13) pour le passage du liquide et est situé juste au-dessous de la surface du liquide dans la cuve (1).Device according to claim 1, characterized in that the upper end (11a) of the chimney (11) is provided with a funnel (12) flared upwards, the upper edge (12a) of which forms the wall of the tank (1), a free space (13) for the passage of the liquid and is located just below the surface of the liquid in the tank (1). Dispositif selon la revendication 1, caractérisé en ce que la cheminée (11) comporte un second organe anti-vortex (20) disposé à l'intérieur de celle-ci et au-dessus de l'hélice (18).Device according to claim 1, characterized in that the chimney (11) comprises a second anti-vortex member (20) arranged inside the latter and above the propeller (18). Dispositif selon la revendication 1, caractérisé en ce que les moyens (26) d'injection du gaz sous pression sont formés par au moins une conduite (27) débouchant dans la cheminée (11) entre l'organe filiforme (23) située au-dessous de l'organe anti-vortex (19) et le milieu de la portion de la cheminée (11) comprise entre le premier organe anti-vortex (19) et la partie inférieure (11b) de la cheminée (11).Device according to claim 1, characterized in that the means (26) for injecting the gas under pressure are formed by at least one pipe (27) opening into the chimney (11) between the filiform member (23) located above below the anti-vortex member (19) and the middle of the portion of the chimney (11) included between the first anti-vortex member (19) and the lower part (11b) of the chimney (11). Dispositif selon la revendication 1, caractérisé en ce que l'arbre (15) comporte, juste au-dessous de la surface du liquide, un organe (28) pour former un vortex au niveau de ladite surface du liquide.Device according to claim 1, characterized in that the shaft (15) comprises, just below the surface of the liquid, a member (28) for forming a vortex at said surface of the liquid.
EP95401088A 1994-06-16 1995-05-10 Liquid aerator and stirring device, for example for fatty affluents Withdrawn EP0687497A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9407394A FR2721229B1 (en) 1994-06-16 1994-06-16 Aeration and mixing device for a liquid such as greasy effluents.
FR9407394 1994-06-16

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Cited By (8)

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EP0818422A1 (en) * 1996-07-12 1998-01-14 Compagnie Internationale De Services Et D'environnement C.I.S.E. Internationale Recovery and recycle of foams in a reactor vessel for liquid treatment
FR2758094A1 (en) * 1997-01-08 1998-07-10 Alain Boulant DEVICE FOR BREWING AND AERATING A LIQUID AND FOR REMOVING FOAM IN A LIQUID TREATMENT TANK
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
FR2823743A1 (en) * 2001-04-19 2002-10-25 Alain Boulant Equipment FOR stirring and aerating e.g. waste water in treatment tank includes funnel with upper edge forming cascade for air introduction
FR2860168A1 (en) * 2003-09-30 2005-04-01 Bio Armor Environnement Foam removal system for activated sludge tank uses duct linked directly to air feeder
US7261279B2 (en) 2001-04-19 2007-08-28 Innova Environnement Device for stirring and aerating a liquid in a treatment vessel
WO2011101580A1 (en) 2010-02-18 2011-08-25 Carbofil France Installation for treating digestates from at least one chamber for the methanation of essentially organic materials
CN110605047A (en) * 2019-09-12 2019-12-24 重庆市三叶家具有限责任公司 Soft furniture processing production line

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EP0264905A1 (en) * 1986-10-21 1988-04-27 Union Carbide Corporation Process and apparatus for mixing of gases and liquids
EP0374967A1 (en) * 1988-12-23 1990-06-27 Praxair Technology, Inc. Improved gas-liquid mixer

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EP0264905A1 (en) * 1986-10-21 1988-04-27 Union Carbide Corporation Process and apparatus for mixing of gases and liquids
EP0374967A1 (en) * 1988-12-23 1990-06-27 Praxair Technology, Inc. Improved gas-liquid mixer

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0818422A1 (en) * 1996-07-12 1998-01-14 Compagnie Internationale De Services Et D'environnement C.I.S.E. Internationale Recovery and recycle of foams in a reactor vessel for liquid treatment
FR2750890A1 (en) * 1996-07-12 1998-01-16 Services Et D Environnement Ci DEVICE FOR RECOVERING AND RECYCLING FOAM IN A LIQUID TREATMENT TANK
CZ297858B6 (en) * 1997-01-08 2007-04-18 Carbofil International Device for stirring and aerating liquid and for eliminating foam inside tank when treating the liquid
WO1998030319A1 (en) * 1997-01-08 1998-07-16 Carbofil International Device for stirring and aerating a liquid and eliminating the foam in a vat for treating this liquid
AU720825B2 (en) * 1997-01-08 2000-06-15 Carbofil International Device for stirring and aerating a liquid and eliminating the foam in a tank for treating said 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
FR2758094A1 (en) * 1997-01-08 1998-07-10 Alain Boulant DEVICE FOR BREWING AND AERATING A LIQUID AND FOR REMOVING FOAM IN A LIQUID TREATMENT TANK
FR2823743A1 (en) * 2001-04-19 2002-10-25 Alain Boulant Equipment FOR stirring and aerating e.g. waste water in treatment tank includes funnel with upper edge forming cascade for air introduction
WO2002085502A1 (en) * 2001-04-19 2002-10-31 Innova Environnement Device for stirring and aerating a liquid in a treatment vessel
US7261279B2 (en) 2001-04-19 2007-08-28 Innova Environnement Device for stirring and aerating a liquid in a treatment vessel
FR2860168A1 (en) * 2003-09-30 2005-04-01 Bio Armor Environnement Foam removal system for activated sludge tank uses duct linked directly to air feeder
WO2011101580A1 (en) 2010-02-18 2011-08-25 Carbofil France Installation for treating digestates from at least one chamber for the methanation of essentially organic materials
CN110605047A (en) * 2019-09-12 2019-12-24 重庆市三叶家具有限责任公司 Soft furniture processing production line

Also Published As

Publication number Publication date
FR2721229B1 (en) 1996-09-06
FR2721229A1 (en) 1995-12-22

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