WO1998053903A1 - Installation for treating fluids - Google Patents

Installation for treating fluids Download PDF

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Publication number
WO1998053903A1
WO1998053903A1 PCT/FR1998/001045 FR9801045W WO9853903A1 WO 1998053903 A1 WO1998053903 A1 WO 1998053903A1 FR 9801045 W FR9801045 W FR 9801045W WO 9853903 A1 WO9853903 A1 WO 9853903A1
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WO
WIPO (PCT)
Prior art keywords
tank
fluid
reservoir
inlet
installation
Prior art date
Application number
PCT/FR1998/001045
Other languages
French (fr)
Inventor
Claude Mechineau
Original Assignee
I.D.'o Concept
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 I.D.'o Concept filed Critical I.D.'o Concept
Publication of WO1998053903A1 publication Critical patent/WO1998053903A1/en

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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
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/712—Feed mechanisms for feeding fluids
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/2132—Concentration, pH, pOH, p(ION) or oxygen-demand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7176—Feed mechanisms characterised by the means for feeding the components to the mixer using pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/82—Forming a predetermined ratio of the substances to be mixed by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour
    • 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
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms

Definitions

  • the present invention relates to an installation for the treatment of fluids, generally aqueous.
  • It relates more particularly to an installation for the treatment of water for drinking water and farm animals by continuously regulating the acidity of this water for watering.
  • Such a treatment is generally characterized by the addition of a treatment fluid, such as an acid, a base or any other generally chemical product in the aqueous fluid supply line.
  • a treatment fluid such as an acid, a base or any other generally chemical product in the aqueous fluid supply line.
  • the difficulty of such an addition is linked to the difference in density generally existing between the aqueous fluid to be treated and the treatment fluid.
  • regulating the amount of process fluid to be added is difficult to operate, the heterogeneity of the mixture leading to false measurement values.
  • the treatment installation comprises an elongated reservoir arranged horizontally, this reservoir being equipped with a supply inlet for the flow of fluid to be treated, with a second inlet for a treatment flow, from an outlet of said fluids, said streams of fluids mixing inside said reservoir during their flow from their respective inlet to the outlet, at least one member for measuring a characteristic of the mixture of fluids and at least means for controlling the quantity of flow of treatment fluid to be introduced into the reservoir, these control means being slaved to said measuring member.
  • This installation is characterized by the presence inside the tank of a baffle to create turbulence promoting the flow of said flow of fluids inside the tank.
  • a baffle to create turbulence promoting the flow of said flow of fluids inside the tank.
  • such an installation has the drawback of not solving the problem of depositing treatment fluid inside the installation but on the contrary of accentuating it by increasing, due to the presence of the baffle, the losses inside the tank.
  • such an installation is relatively complex to manufacture.
  • the object of the present invention is therefore to propose an installation of simple design, in particular free of moving parts, inside which the losses of charge are low despite obtaining a homogeneous mixture of fluids of different densities.
  • Another object of the present invention is to provide a treatment installation in which the risks of clogging of the installation by deposition of the treatment fluid on the walls of the installation are extremely low.
  • Another object of the invention is to propose an installation for the treatment of fluids in which the variations of the supply network of fluids to be treated are taken into account in real time and continuously.
  • the subject of the invention is an installation for the treatment of fluids, generally aqueous, such as water for watering farm animals, by continuously regulating a characteristic, such as the acidity of said fluid, this installation comprising at least one pressure tank equipped with at least one inlet for supplying the flow of fluid to be treated, such as water for watering, with at least one second inlet for a flow of treatment fluid, from at least one outlet of said fluids, said streams of fluids mixing inside said reservoir during their flow from their respective inlet to the outlet, at least one member for measuring the characteristic of the treated fluid and at least one metering pump of the amount of flow of treatment fluid to be introduced into the reservoir through said second inlet, the operation of this pump being subject to the value of the measurement carried out by said member e measurement, installation characterized in that the reservoir is organized around a vertical axis, the fluid flow inlets being arranged in the upper part of said reservoir while the outlet of the treated fluid and the measuring member are arranged in the lower part of the reservoir so as to ensure free flow along a
  • the reservoir consists of a bottom side and a top side connected together by side walls organized around said vertical axis.
  • the inlet of the treatment fluid is preferably arranged in the top face of the tank in the vicinity of the vertical axis of said tank.
  • the outlet of the tank is then formed in the bottom side of the tank in the vicinity of the vertical axis of said tank.
  • the installation for the treatment of fluids, object of the invention is more particularly intended for the treatment of water for watering farm animals, by regulating this water while maintaining the pH of this water below d '' a predetermined pH value.
  • this installation can be used for the treatment of any type of fluid by adding another fluid.
  • the pH of the drinking water is an important parameter because the pH influences the quality of the water especially in terms of bacteriological load.
  • This drinking water generally shows significant variations from one farm to another.
  • the quality of the water and its properties can vary greatly over the course of a day. It is therefore essential to have an installation which treats the fluid to be treated in real time and continuously.
  • the installation, object of the invention 5 comprises a pressure tank 1 fitted with at least one inlet 2 for supplying the flow of fluid to be treated and at least one second inlet 3 for a flow treatment fluid.
  • the fluid to be treated consists of water for watering farm animals 1 () while the treatment fluid consists of an acid or a mixture of acids.
  • a hydrogen peroxide / acetic acid mixture, a mixture of paracetic acid and a weak organic acid, an isomeric lactic acid, etc. can be used as the acid.
  • any other treatment fluid can be used depending on the regulation to be carried out.
  • the drinking water constituting the fluid to be treated is itself made up of water from the water network.
  • the reservoir 1 also has at least one outlet 4 for the fluids, the fluid flows mixing inside said reservoir 1 during their flow from their respective inlet 2, 3 towards the outlet 4.
  • This outlet 4 is 5 for example connected in known manner to an installation for distributing said fluid thus treated to animals.
  • the reservoir also comprises, in a manner known per se, at least one member 5 for measuring a characteristic of the treated fluid and at least one metering pump 10 for the amount of flow of treatment fluid to be introduced into the reservoir through said second input 3.
  • the operation of this pump 10 is controlled by the value of the measurement 5 carried out by said measuring member 5.
  • the measuring member 5 is a probe with a pH meter 11.
  • the dosing pump 10, slaved to the measuring member 5, is in turn a volume dosing pump constant, generally electromagnetic, connected on the one hand to the inlet 3 for treatment fluid from the reservoir 1, on the other hand to a reservoir 12 for storing the treatment fluid, the operation of the metering pump being controlled by the measured value by said measuring member 5 with respect to a predetermined set value, preferably adjustable. This set value is set by the user at the pH meter 11.
  • the operating principle of the metering pump 10 is as follows. When the value measured by the measuring member 5 is greater than the predetermined set value, the pH meter 11 emits a signal towards the metering pump 10 which pumps a constant predetermined volume of treatment fluid into the storage tank 12 treatment fluid for injecting it inside said reservoir 1 through the inlet 3 for supplying treatment fluid to said reservoir 1. This operation can be repeated several times until the measuring member 5 measures a pH value lower than the predetermined set value. The acidity of the water then conforms to that desired by the operator.
  • this installation is characterized on the one hand by the shape of the reservoir, on the other hand by the arrangement of the inlets of the outlet and of the measuring member inside said reservoir.
  • the reservoir 1 is organized around a vertical axis XX '.
  • the inputs 2 and 3 of fluid flow are arranged in the upper part of said tank 1 while the outlet 4 of the treated fluid and the measuring member 5 are arranged in the lower part of the tank.
  • a free flow is thus obtained along an essentially vertical trajectory of the flows of fluids inside the tank 1 with pressure drops inside the tank reduced to a minimum. This also eliminates any accumulation of deposits of treatment fluid along the internal walls of the tank 1.
  • the tank 1 generally consisting of a stainless steel tank with a capacity of the order of twenty liters, has a bottom face 6 and a top face 7 connected together by side walls 8 organized around said vertical axis XX '.
  • the reservoir 1 thus affects the shape of a body of generally cylindrical appearance.
  • the inlet 3 of the treatment fluid is formed in the top face 7 of the reservoir 1 in the vicinity of the vertical axis XX 'of said reservoir 1.
  • the outlet 4 of the reservoir 1 is in turn formed in the bottom face 6 of the reservoir 1 in the vicinity of the vertical axis XX 'of said reservoir 1.
  • the inlet 3 of the treatment fluid and the outlet 4 of the reservoir 1 are located on the same vertical axis, in in particular the axis XX 'of the reservoir 1, as shown in FIG. 1. The mixture is thus optimized.
  • the bottom face 6 of the reservoir 1 defines a concave surface with concavity turned towards the interior of the reservoir 1.
  • This concavity facilitates the flow of the treated fluid along the bottom face of the reservoir 1.
  • this bottom face 6 assumes the shape of a dome or a dome whose top would be arranged outside of said reservoir.
  • the top face 7 of said reservoir delimits a concave surface with a concavity turned towards the interior of the reservoir 1 to increase the pressure resistance of the reservoir 1.
  • this concavity facilitates the flow of the treatment fluid introduced by the inlet 3 along the wall of the top face of said tank 1 so as to allow the distribution of this fluid over the entire internal surface of the tank 1 and facilitate its mixing with the water of watering introduced inside of tank 1. This results in better mixing between said fluid flows.
  • the increase in the resistance to pressure of the tank 1 is an important characteristic of this tank. Indeed, the supply of fluid flow to be treated is carried out under pressure continuously inside said tank 1. This pressure is variable from one installation to another.
  • This reservoir 1 is generally filled with a flow of fluid to be treated.
  • the addition of treatment fluid inside the reservoir generates, during the mixing of this treatment fluid with the fluid to be treated, gases whose evacuation is necessary.
  • the reservoir 1 is equipped in its upper part with a drain 9.
  • the inlet 3 for treatment fluid from the reservoir 1 is equipped with a non-return valve (not shown).
  • the metering pump 10 at constant volume is, in turn, arranged to allow the adjustment of the amount of volume of injectable treatment fluid. This quantity is adjusted by the operator by means of an adjustment member (not shown) of the pump as a function of the flow rate of the fluid flow to be treated introduced into the tank 1 through the inlet 2.
  • the pH meter measurement probe is generally constituted by an electrode installed inside an electrode holder screwed tightly inside an orifice formed in the side wall 8 of the tank 1 in the vicinity of the lower part. of the tank.
  • the inlet 2 for supplying the fluid to be treated inside the tank 1 is formed in the upper part of said tank 1 in a side wall 8 of said tank.
  • this inlet 2 was formed in the top face 7 of said tank.
  • inlet 2 for the fluid to be treated and inlet 3 for the processing fluid form a substantially 90-degree angle between them.
  • the measuring member 5 is screwed inside an orifice formed in the side wall 8 of the tank 1, it can be easily removed by unscrewing. This unscrewing is necessary to carry out a regular calibration of the pH meter 11. This calibration requires a preliminary emptying of the reservoir 1. To do this, the inlet for the supply of fluid to be treated 2 can be closed by means of a closure member. suitable, such as a valve. The rest of the time, this closing member is kept open.
  • the metering pump 10 can also operate in proportional flow.
  • the pump will be used for other applications, in particular for dispensing drugs by adding said drug to the fluid to be treated.

Abstract

The invention concerns an installation for treating fluid(s) comprising at least a pressurised tank (1) provided with at least an inlet (2) for the fluid to be treated, at least a second inlet (3) for a treating fluid, at least an outlet (4) for the treated fluid, at least a device for measuring (5) the characteristic of the treated fluid and at least a pump measuring out the amount of treating fluid to be introduced into the tank automatically controlled by the measuring device (5). The invention is characterised in that the tank (1) is arranged about a vertical axis (XX'), the fluid inlets (2, 3) being located in the tank (1) upper part while the outlet (4) and the measuring device (5) are located in the tank (1) lower part. The invention is useful for treating drinking water for livestock.

Description

Installation pour le traitement de fluidesInstallation for the treatment of fluids
La présente invention concerne une installation pour le traitement de fluides, généralement aqueux.The present invention relates to an installation for the treatment of fluids, generally aqueous.
Elle concerne plus particulièrement une installation pour le traitement de l'eau d ' abreuve ent d'animaux d'élevage par la régulation en continu de l'acidité de cette eau d ' abreuvement.It relates more particularly to an installation for the treatment of water for drinking water and farm animals by continuously regulating the acidity of this water for watering.
II existe de nombreuses installations pour le traitement de fluides, en particulier de fluides aqueux. Un tel traitement se caractérise généralement par l'addition d'un fluide de traitement, tel qu'un acide, une base ou tout autre produit généralement chimique dans la ligne d'alimentation en fluide aqueux. La difficulté d'une telle addition est liée à la différence de densité existant généralement entre le fluide aqueux à traiter et le fluide de traitement. Il en résulte un mélange hétérogène accompagné de nombreux dépôts du fluide de traitement, généralement plus lourd, sur les parois de l'installation. Ce dépôt se traduit rapidement par un colmatage de l'installation. En outre, dans ce cas, la régulation de la quantité de fluide de traitement à ajouter est difficile à opérer, l'hétérogénéité du mélange amenant à des valeurs de mesure fausses. Or, une mauvaise régulation de paramètres, tels que l'acidité, d'une eau d ' abreuvement d'animaux d'élevage peut avoir des conséquences importantes sur la vie des animaux. On sait que le maintien du pH de l'eau à 1 ' intérieur de plages de valeurs prédéterminées permet de supprimer certains parasites contenus dans l'eau, d'augmenter l'appétit des animaux, etc.There are numerous installations for the treatment of fluids, in particular aqueous fluids. Such a treatment is generally characterized by the addition of a treatment fluid, such as an acid, a base or any other generally chemical product in the aqueous fluid supply line. The difficulty of such an addition is linked to the difference in density generally existing between the aqueous fluid to be treated and the treatment fluid. This results in a heterogeneous mixture accompanied by numerous deposits of treatment fluid, generally heavier, on the walls of the installation. This deposit quickly results in clogging of the installation. In addition, in this case, regulating the amount of process fluid to be added is difficult to operate, the heterogeneity of the mixture leading to false measurement values. However, poor regulation of parameters, such as the acidity, of drinking water for farm animals can have important consequences on the life of animals. It is known that maintaining the pH of water within ranges of predetermined values makes it possible to suppress certain parasites contained in water, to increase the appetite of animals, etc.
Jusqu'à présent, pour pallier ce problème d'obtention d'un mélange hétérogène fluide de traitement/fluide à traiter, on a conçu des installations de mélange complexes, telles que celle décrite dans le brevet US-A-3.743.598. Dans ce cas, l'installation de traitement comporte un réservoir allongé et disposé à l'horizontal, ce réservoir étant équipé d'une entrée d'alimentation en flux de fluide à traiter, d'une seconde entrée d'un flux de traitement, d'une sortie desdits fluides, lesdits flux de fluides se mélangeant à l'intérieur dudit réservoir au cours de leur écoulement de leur entrée respective vers la sortie, au moins un organe de mesure d'une caractéristique du mélange de fluides et au moins des moyens de commande de la quantité de flux de fluide de traitement à introduire dans le réservoir, ces moyens de commande étant asservis audit organe de mesure. Cette installation se caractérise par la présence à l'intérieur du réservoir d'une chicane pour créer des turbulences favorisant l'écoulement desdits flux de fluides à l'intérieur du réservoir. Toutefois, une telle installation présente l'inconvénient de ne pas résoudre le problème du dépôt de fluide de traitement à 1 ' intérieur de l'installation mais au contraire de l'accentuer en augmentant, du fait de la présence de la chicane, les pertes de charge à l'intérieur du réservoir. En outre, une telle installation est relativement complexe à fabriquer.Up to now, to overcome this problem of obtaining a heterogeneous mixture of treatment fluid / fluid to be treated, complex mixing installations have been designed, such as that described in patent US-A-3,743,598. In this case, the treatment installation comprises an elongated reservoir arranged horizontally, this reservoir being equipped with a supply inlet for the flow of fluid to be treated, with a second inlet for a treatment flow, from an outlet of said fluids, said streams of fluids mixing inside said reservoir during their flow from their respective inlet to the outlet, at least one member for measuring a characteristic of the mixture of fluids and at least means for controlling the quantity of flow of treatment fluid to be introduced into the reservoir, these control means being slaved to said measuring member. This installation is characterized by the presence inside the tank of a baffle to create turbulence promoting the flow of said flow of fluids inside the tank. However, such an installation has the drawback of not solving the problem of depositing treatment fluid inside the installation but on the contrary of accentuating it by increasing, due to the presence of the baffle, the losses inside the tank. In addition, such an installation is relatively complex to manufacture.
Le but de la présente invention est donc de proposer une installation de conception simple, en particulier exempte de pièces mobiles, à l'intérieur de laquelle les pertes de charge sont faibles malgré l'obtention d'un mélange homogène de fluides de densités différentes.The object of the present invention is therefore to propose an installation of simple design, in particular free of moving parts, inside which the losses of charge are low despite obtaining a homogeneous mixture of fluids of different densities.
Un autre but de la présente invention est de proposer une installation de traitement dans laquelle les risques de colmatage de l'installation par dépôt du fluide de traitement sur les parois de l'installation sont extrêmement faibles.Another object of the present invention is to provide a treatment installation in which the risks of clogging of the installation by deposition of the treatment fluid on the walls of the installation are extremely low.
Un autre but de l'invention est de proposer une installation pour le traitement de fluides dans laquelle les variations du réseau d'alimentation en fluides à traiter sont prises en compte en temps réel et en continu.Another object of the invention is to propose an installation for the treatment of fluids in which the variations of the supply network of fluids to be treated are taken into account in real time and continuously.
A cet effet, l'invention a pour objet une installation pour le traitement de fluides, généralement aqueux, tels que de l'eau d ' abreuvement d'animaux d'élevage, par la régulation en continu d'une caractéristique, telle que l'acidité, dudit fluide, cette installation comprenant au moins un réservoir sous pression équipé d'au moins une entrée d'alimentation en flux de fluide à traiter, tel que de l'eau d' abreuvement, d'au moins une seconde entrée d'un flux de fluide de traitement, d'au moins une sortie desdits fluides, lesdits flux de fluides se mélangeant à l'intérieur dudit réservoir au cours de leur écoulement de leur entrée respective vers la sortie, au moins un organe de mesure de la caractéristique du fluide traité et au moins une pompe doseuse de la quantité de flux de fluide de traitement à introduire dans le réservoir à travers ladite seconde entrée, le fonctionnement de cette pompe étant asservi à la valeur de la mesure effectuée par ledit organe de mesure, installation caractérisée en ce que le réservoir est organisé autour d'un axe vertical, les entrées de flux de fluides étant disposées en partie haute dudit réservoir tandis que la sortie du fluide traité et l'organe de mesure sont disposés en partie basse du réservoir de manière à assurer un écoulement libre suivant une trajectoire essentiellement verticale desdits flux de fluides à l'intérieur dudit réservoir.To this end, the subject of the invention is an installation for the treatment of fluids, generally aqueous, such as water for watering farm animals, by continuously regulating a characteristic, such as the acidity of said fluid, this installation comprising at least one pressure tank equipped with at least one inlet for supplying the flow of fluid to be treated, such as water for watering, with at least one second inlet for a flow of treatment fluid, from at least one outlet of said fluids, said streams of fluids mixing inside said reservoir during their flow from their respective inlet to the outlet, at least one member for measuring the characteristic of the treated fluid and at least one metering pump of the amount of flow of treatment fluid to be introduced into the reservoir through said second inlet, the operation of this pump being subject to the value of the measurement carried out by said member e measurement, installation characterized in that the reservoir is organized around a vertical axis, the fluid flow inlets being arranged in the upper part of said reservoir while the outlet of the treated fluid and the measuring member are arranged in the lower part of the reservoir so as to ensure free flow along a trajectory essentially vertical of said fluid flows inside said tank.
Selon une forme de réalisation préférée de l'invention, le réservoir est constitué d'une face formant fond et d'une face du dessus reliées entre elles par des parois latérales organisées autour dudit axe vertical. Dans ce cas, l'entrée du fluide de traitement est de préférence ménagée dans la face du dessus du réservoir au voisinage de l'axe vertical dudit réservoir. Avantageusement, la sortie du réservoir est alors ménagée dans la face formant fond du réservoir au voisinage de l'axe vertical dudit réservoir.According to a preferred embodiment of the invention, the reservoir consists of a bottom side and a top side connected together by side walls organized around said vertical axis. In this case, the inlet of the treatment fluid is preferably arranged in the top face of the tank in the vicinity of the vertical axis of said tank. Advantageously, the outlet of the tank is then formed in the bottom side of the tank in the vicinity of the vertical axis of said tank.
L'invention sera bien comprise à la lecture de la description suivante d'un exemple de réalisation, en référence à la figure unique qui représente une vue schématique partielle d'une installation pour le traitement de fluides conforme à l'invention.The invention will be clearly understood on reading the following description of an exemplary embodiment, with reference to the single figure which represents a partial schematic view of an installation for the treatment of fluids according to the invention.
L'installation pour le traitement de fluides, objet de l'invention, est plus particulièrement destinée au traitement de l'eau d ' abreuvement d'animaux d'élevage, par régulation de cette eau en maintenant le pH de cette eau en deçà d'une valeur de pH prédéterminée. Toutefois, cette installation pourra être utilisée pour le traitement de n'importe quel type de fluide par addition d'un autre fluide.The installation for the treatment of fluids, object of the invention, is more particularly intended for the treatment of water for watering farm animals, by regulating this water while maintaining the pH of this water below d '' a predetermined pH value. However, this installation can be used for the treatment of any type of fluid by adding another fluid.
Comme il a déjà été précisé ci-dessus, le pH de l'eau d ' abreuvement, appelée fluide à traiter, d'animaux d'élevage est un paramètre important car le pH influe sur la qualité de l'eau notamment en terme de charge bactériologique. Cette eau d ' abreuvement présente généralement des variations importantes d'un élevage à un autre. En outre, au sein d'une même installation, la qualité de l'eau et ses propriétés peuvent varier fortement au cours d'une journée. Il est donc primordial de disposer d'une installation qui traite en temps réel et en continu le fluide à traiter.As already stated above, the pH of the drinking water, called the fluid to be treated, of farm animals is an important parameter because the pH influences the quality of the water especially in terms of bacteriological load. This drinking water generally shows significant variations from one farm to another. In addition, within a single installation, the quality of the water and its properties can vary greatly over the course of a day. It is therefore essential to have an installation which treats the fluid to be treated in real time and continuously.
Pour ce faire, l'installation, objet de l'invention 5 comprend un réservoir 1 sous pression équipé d'au moins une entrée 2 d'alimentation en flux de fluide à traiter et d'au moins une seconde entrée 3 d'un flux de fluide de traitement. Dans l'exemple choisi, le fluide à traiter est constitué par de l'eau d ' abreuvement des animaux d'élevage l() tandis que le fluide de traitement est constitué par un acide ou un mélange d'acides. A titre d'exemple, on peut utiliser comme acide un mélange peroxyde d'hydrogène/acide acétique, un mélange d'acide paracétique et d'un acide organique faible, un acide lactique isomère, etc. BienTo do this, the installation, object of the invention 5 comprises a pressure tank 1 fitted with at least one inlet 2 for supplying the flow of fluid to be treated and at least one second inlet 3 for a flow treatment fluid. In the example chosen, the fluid to be treated consists of water for watering farm animals 1 () while the treatment fluid consists of an acid or a mixture of acids. As an example, a hydrogen peroxide / acetic acid mixture, a mixture of paracetic acid and a weak organic acid, an isomeric lactic acid, etc. can be used as the acid. Well
15 évidemment, comme il a été précisé ci-dessus, tout autre fluide de traitement peut être utilisé en fonction de la régulation à effectuer. L'eau d ' abreuvement constituant le fluide à traiter est quant à elle constituée par l'eau du réseau d'eau. 0Obviously, as has been specified above, any other treatment fluid can be used depending on the regulation to be carried out. The drinking water constituting the fluid to be treated is itself made up of water from the water network. 0
Le réservoir 1 comporte encore au moins une sortie 4 des fluides, les flux de fluides se mélangeant à l'intérieur dudit réservoir 1 au cours de leur écoulement de leur entrée respective 2, 3 vers la sortie 4. Cette sortie 4 est 5 par exemple raccordée de manière en soi connue à une installation de distribution dudit fluide ainsi traité aux animaux.The reservoir 1 also has at least one outlet 4 for the fluids, the fluid flows mixing inside said reservoir 1 during their flow from their respective inlet 2, 3 towards the outlet 4. This outlet 4 is 5 for example connected in known manner to an installation for distributing said fluid thus treated to animals.
Le réservoir comporte encore, de manière en soi connue, au 0 moins un organe de mesure 5 d'une caractéristique du fluide traité et au moins une pompe doseuse 10 de la quantité de flux de fluide de traitement à introduire dans le réservoir à travers ladite seconde entrée 3. Le fonctionnement de cette pompe 10 est asservi à la valeur de la mesure 5 effectuée par ledit organe de mesure 5. Dans l'exemple représenté, l'organe de mesure 5 est une sonde d'un pH mètre 11. La pompe doseuse 10, asservie à l'organe de mesure 5, est quant à elle une pompe doseuse à volume constant, généralement électromagnétique, reliée d'une part à l'entrée 3 de fluide de traitement du réservoir 1, d'autre part à un réservoir 12 de stockage du fluide de traitement, le fonctionnement de la pompe doseuse étant asservi à la valeur mesurée par ledit organe de mesure 5 par rapport à une valeur de consigne prédéterminée, de préférence réglable. Cette valeur de consigne est réglée par l'utilisateur au niveau du pH mètre 11.The reservoir also comprises, in a manner known per se, at least one member 5 for measuring a characteristic of the treated fluid and at least one metering pump 10 for the amount of flow of treatment fluid to be introduced into the reservoir through said second input 3. The operation of this pump 10 is controlled by the value of the measurement 5 carried out by said measuring member 5. In the example shown, the measuring member 5 is a probe with a pH meter 11. The dosing pump 10, slaved to the measuring member 5, is in turn a volume dosing pump constant, generally electromagnetic, connected on the one hand to the inlet 3 for treatment fluid from the reservoir 1, on the other hand to a reservoir 12 for storing the treatment fluid, the operation of the metering pump being controlled by the measured value by said measuring member 5 with respect to a predetermined set value, preferably adjustable. This set value is set by the user at the pH meter 11.
Le principe de fonctionnement de la pompe doseuse 10 est le suivant. Lorsque la valeur mesurée par l'organe de mesure 5 est supérieure à la valeur de consigne prédéterminée, le pH mètre 11 émet un signal en direction de la pompe doseuse 10 qui pompe un volume prédéterminé constant de fluide de traitement dans le réservoir de stockage 12 du fluide de traitement pour l'injecter à l'intérieur dudit réservoir 1 à travers l'entrée 3 d'alimentation en fluide de traitement dudit réservoir 1. Cette opération peut être répétée plusieurs fois jusqu'à ce que l'organe de mesure 5 mesure une valeur de pH inférieure à la valeur de consigne prédéterminée. L'acidité de l'eau est alors conforme à celle souhaitée par l'opérateur.The operating principle of the metering pump 10 is as follows. When the value measured by the measuring member 5 is greater than the predetermined set value, the pH meter 11 emits a signal towards the metering pump 10 which pumps a constant predetermined volume of treatment fluid into the storage tank 12 treatment fluid for injecting it inside said reservoir 1 through the inlet 3 for supplying treatment fluid to said reservoir 1. This operation can be repeated several times until the measuring member 5 measures a pH value lower than the predetermined set value. The acidity of the water then conforms to that desired by the operator.
Selon l'invention, cette installation se caractérise d'une part par la forme du réservoir, d'autre part par la disposition des entrées de la sortie et de l'organe de mesure à l'intérieur dudit réservoir. En effet, le réservoir 1 est organisé autour d'un axe vertical XX'. Les entrées 2 et 3 de flux de fluides sont disposées en partie haute dudit réservoir 1 tandis que la sortie 4 du fluide traité et 1 ' organe de mesure 5 sont disposés en partie basse du réservoir. On obtient ainsi un écoulement libre suivant une trajectoire essentiellement verticale des flux de fluides à 1 ' intérieur du réservoir 1 avec des pertes de charge à l'intérieur du réservoir réduites au minimum. On supprime ainsi également toute accumulation de dépôts de fluide de traitement le long des parois internes du réservoir 1. Comme le montre la figure 1, le réservoir 1, généralement constitué par une cuve en inox d'une contenance de l'ordre d'une vingtaine de litres, comporte une face formant fond 6 et une face du dessus 7 reliées entre elles par des parois latérales 8 organisées autour dudit axe vertical XX'. Le réservoir 1 affecte ainsi la forme d'un corps d'allure générale cylindrique. L'entrée 3 du fluide de traitement est ménagée dans la face du dessus 7 du réservoir 1 au voisinage de l'axe vertical XX' dudit réservoir 1. La sortie 4 du réservoir 1 est quant à elle ménagée dans la face formant fond 6 du réservoir 1 au voisinage de l'axe vertical XX' dudit réservoir 1. Dans une forme de réalisation préférée de l'invention, l'entrée 3 du fluide de traitement et la sortie 4 du réservoir 1 sont situées sur un même axe vertical, en particulier l'axe XX' du réservoir 1, comme cela est représenté à la figure 1. Le mélange est ainsi optimisé.According to the invention, this installation is characterized on the one hand by the shape of the reservoir, on the other hand by the arrangement of the inlets of the outlet and of the measuring member inside said reservoir. Indeed, the reservoir 1 is organized around a vertical axis XX '. The inputs 2 and 3 of fluid flow are arranged in the upper part of said tank 1 while the outlet 4 of the treated fluid and the measuring member 5 are arranged in the lower part of the tank. A free flow is thus obtained along an essentially vertical trajectory of the flows of fluids inside the tank 1 with pressure drops inside the tank reduced to a minimum. This also eliminates any accumulation of deposits of treatment fluid along the internal walls of the tank 1. As shown in Figure 1, the tank 1, generally consisting of a stainless steel tank with a capacity of the order of twenty liters, has a bottom face 6 and a top face 7 connected together by side walls 8 organized around said vertical axis XX '. The reservoir 1 thus affects the shape of a body of generally cylindrical appearance. The inlet 3 of the treatment fluid is formed in the top face 7 of the reservoir 1 in the vicinity of the vertical axis XX 'of said reservoir 1. The outlet 4 of the reservoir 1 is in turn formed in the bottom face 6 of the reservoir 1 in the vicinity of the vertical axis XX 'of said reservoir 1. In a preferred embodiment of the invention, the inlet 3 of the treatment fluid and the outlet 4 of the reservoir 1 are located on the same vertical axis, in in particular the axis XX 'of the reservoir 1, as shown in FIG. 1. The mixture is thus optimized.
Pour parfaire 1 ' évacuation du produit de traitement et éviter son accumulation au niveau de la face formant fond 6 du réservoir 1, la face formant fond 6 du réservoir 1 délimite une surface concave à concavité tournée vers l'intérieur du réservoir 1. Cette concavité facilite l'écoulement du fluide traité le long de la face formant fond du réservoir 1. Dans l'exemple représenté, cette face formant fond 6 affecte la forme d'un dôme ou d'une coupole dont le sommet serait disposé à 1 ' extérieur dudit réservoir. De même, la face du dessus 7 dudit réservoir délimite une surface concave à concavité tournée vers 1 ' intérieur du réservoir 1 pour augmenter la résistance à la pression du réservoir 1. En outre, cette concavité facilite 1 ' écoulement du fluide de traitement introduit par l'entrée 3 le long de la paroi de la face du dessus dudit réservoir 1 de manière à permettre la répartition de ce fluide sur toute la surface interne du réservoir 1 et faciliter son mélange avec l'eau d ' abreuvement introduite à l'intérieur du réservoir 1. Il en résulte un meilleur mélange entre lesdits flux de fluides. L'augmentation de la résistance à la pression du réservoir 1 est une caractéristique importante de ce réservoir. En effet, l'alimentation en flux de fluide à traiter s'effectue sous pression de manière continue à l'intérieur dudit réservoir 1. Cette pression est variable d'une installation à une autre. Ce réservoir 1 est généralement rempli en flux de fluide à traiter.To complete the evacuation of the treatment product and avoid its accumulation at the bottom face 6 of the reservoir 1, the bottom face 6 of the reservoir 1 defines a concave surface with concavity turned towards the interior of the reservoir 1. This concavity facilitates the flow of the treated fluid along the bottom face of the reservoir 1. In the example shown, this bottom face 6 assumes the shape of a dome or a dome whose top would be arranged outside of said reservoir. Likewise, the top face 7 of said reservoir delimits a concave surface with a concavity turned towards the interior of the reservoir 1 to increase the pressure resistance of the reservoir 1. In addition, this concavity facilitates the flow of the treatment fluid introduced by the inlet 3 along the wall of the top face of said tank 1 so as to allow the distribution of this fluid over the entire internal surface of the tank 1 and facilitate its mixing with the water of watering introduced inside of tank 1. This results in better mixing between said fluid flows. The increase in the resistance to pressure of the tank 1 is an important characteristic of this tank. Indeed, the supply of fluid flow to be treated is carried out under pressure continuously inside said tank 1. This pressure is variable from one installation to another. This reservoir 1 is generally filled with a flow of fluid to be treated.
En outre, l'addition de fluide de traitement à l'intérieur du réservoir génère, au cours du mélange de ce fluide de traitement avec le fluide à traiter, des gaz dont l'évacuation est nécessaire. Pour ce faire, le réservoir 1 est équipé dans sa partie haute d'une purge 9. Pour parfaire une telle installation, l'entrée 3 en fluide de traitement du réservoir 1 est équipée d'un clapet antiretour (non représenté). La pompe doseuse 10 à volume constant est, quant à elle, agencée pour permettre le réglage de la quantité de volume de fluide de traitement injectable. Cette quantité est réglée par l'opérateur au moyen d'un organe de réglage (non représenté) de la pompe en fonction du débit du flux de fluide à traiter introduit à 1 ' intérieur du réservoir 1 par 1 ' entrée 2.In addition, the addition of treatment fluid inside the reservoir generates, during the mixing of this treatment fluid with the fluid to be treated, gases whose evacuation is necessary. To do this, the reservoir 1 is equipped in its upper part with a drain 9. To perfect such an installation, the inlet 3 for treatment fluid from the reservoir 1 is equipped with a non-return valve (not shown). The metering pump 10 at constant volume is, in turn, arranged to allow the adjustment of the amount of volume of injectable treatment fluid. This quantity is adjusted by the operator by means of an adjustment member (not shown) of the pump as a function of the flow rate of the fluid flow to be treated introduced into the tank 1 through the inlet 2.
La sonde de mesure du pH mètre est généralement constituée par une électrode installée à l'intérieur d'un porte électrode vissé de manière étanche à l'intérieur d'un orifice ménagé dans la paroi latérale 8 du réservoir 1 au voisinage de la partie inférieure du réservoir. On note également que , dans 1 ' exemple représenté, 1 ' entrée 2 d'alimentation en fluide à traiter à l'intérieur du réservoir 1 est ménagée dans la partie haute dudit réservoir 1 dans une paroi latérale 8 dudit réservoir. Toutefois, un résultat identique pourrait être obtenu si cette entrée 2 était ménagée dans la face du dessus 7 dudit réservoir. Dans l'exemple représenté, entrée 2 en fluide à traiter et entrée 3 en fluide de traitement forment entre elles sensiblement un angle à 90 degrés. Il est à noter également que, du fait que l'organe de mesure 5 est vissé à l'intérieur d'un orifice ménagé dans la paroi latérale 8 du réservoir 1, il peut être aisément démonté par dévissage. Ce dévissage est nécessaire pour procéder à un étalonnage régulier du pH mètre 11. Cet étalonnage nécessite une vidange préalable du réservoir 1. Pour ce faire, l'entrée en alimentation en fluide à traiter 2 peut être obturée au moyen d'un organe de fermeture approprié, tel qu'une vanne. Le reste du temps, cet organe de fermeture est maintenu ouvert.The pH meter measurement probe is generally constituted by an electrode installed inside an electrode holder screwed tightly inside an orifice formed in the side wall 8 of the tank 1 in the vicinity of the lower part. of the tank. It is also noted that, in the example shown, the inlet 2 for supplying the fluid to be treated inside the tank 1 is formed in the upper part of said tank 1 in a side wall 8 of said tank. However, an identical result could be obtained if this inlet 2 was formed in the top face 7 of said tank. In the example shown, inlet 2 for the fluid to be treated and inlet 3 for the processing fluid form a substantially 90-degree angle between them. Note also that, because the measuring member 5 is screwed inside an orifice formed in the side wall 8 of the tank 1, it can be easily removed by unscrewing. This unscrewing is necessary to carry out a regular calibration of the pH meter 11. This calibration requires a preliminary emptying of the reservoir 1. To do this, the inlet for the supply of fluid to be treated 2 can be closed by means of a closure member. suitable, such as a valve. The rest of the time, this closing member is kept open.
Il est à noter enfin que la pompe doseuse 10 peut fonctionner également en débit proportionnel. Dans ce cas, la pompe sera utilisée pour d'autres applications, en particulier pour la distribution de médicaments par addition dudit médicament dans le fluide à traiter. Finally, it should be noted that the metering pump 10 can also operate in proportional flow. In this case, the pump will be used for other applications, in particular for dispensing drugs by adding said drug to the fluid to be treated.

Claims

REVENDICATIONS
1. Installation pour le traitement de fluides, généralement aqueux, tels que de l'eau d ' abreuvement d'animaux d'élevage, par la régulation en continu d'une caractéristique, telle que l'acidité, dudit fluide, cette installation comprenant au moins un réservoir (1) sous pression équipé d'au moins une entrée (2) d'alimentation en flux de fluide à traiter, tel que de l'eau d ' abreuvement , d'au moins une seconde entrée (3) d'un flux de fluide de traitement, d'au moins une sortie (4) du fluide traité, lesdits flux de fluides se mélangeant à l'intérieur dudit réservoir (1) au cours de leur écoulement de leur entrée respective vers la sortie, au moins un organe de mesure (5) de la caractéristique du fluide traité et au moins une pompe doseuse de la quantité de flux de fluide de traitement à introduire dans le réservoir à travers ladite seconde entrée (3), le fonctionnement de cette pompe étant asservi à la valeur de la mesure effectuée par ledit organe de mesure ( 5 ) , installation caractérisée en ce que le réservoir (1) est organisé autour d'un axe vertical (XX1), les entrées (2, 3) de flux de fluides étant disposées en partie haute dudit réservoir (1) tandis que la sortie (4) de fluide traité et l'organe de mesure (5) sont disposés en partie basse du réservoir (1) de manière à assurer un écoulement libre suivant une trajectoire essentiellement verticale desdits flux de fluides à l'intérieur dudit réservoir (1).1. Installation for the treatment of fluids, generally aqueous, such as water for watering farm animals, by the continuous regulation of a characteristic, such as the acidity, of said fluid, this installation comprising at least one pressure tank (1) equipped with at least one inlet (2) for supplying a flow of fluid to be treated, such as water for watering, with at least a second inlet (3) d '' a flow of treatment fluid, from at least one outlet (4) of the treated fluid, said fluid streams mixing inside said tank (1) during their flow from their respective inlet to the outlet, at at least one member (5) for measuring the characteristic of the treated fluid and at least one metering pump for the amount of flow of treatment fluid to be introduced into the reservoir through said second inlet (3), the operation of this pump being controlled to the value of the measurement made by said measuring body e (5), installation characterized in that the tank (1) is organized around a vertical axis (XX 1 ), the fluid flow inlets (2, 3) being arranged in the upper part of said tank (1) while that the outlet (4) of treated fluid and the measuring member (5) are arranged in the lower part of the reservoir (1) so as to ensure a free flow along a substantially vertical trajectory of said fluid flows inside said reservoir (1).
2. Installation selon la revendication 1, caractérisée en ce que le réservoir (1) est constitué d'une face formant fond (6) et d'une face du dessus (7) reliées entre elles par des parois latérales (8) organisées autour dudit axe vertical (XX1). 2. Installation according to claim 1, characterized in that the tank (1) consists of a bottom face (6) and a top face (7) connected together by side walls (8) organized around of said vertical axis (XX 1 ).
3. Installation selon la revendication 2, caractérisée en ce que l'entrée (3) du fluide de traitement est ménagée dans la face du dessus (7) du réservoir (1) au voisinage de l'axe vertical (XX1) dudit réservoir (1).3. Installation according to claim 2, characterized in that the inlet (3) of the treatment fluid is formed in the top face (7) of the tank (1) in the vicinity of the vertical axis (XX 1 ) of said tank (1).
4. Installation selon l'une des revendications 2 et 3 , caractérisée en ce que la sortie (4) du réservoir (1) est ménagée dans la face formant fond (6) du réservoir (1) au voisinage de l'axe vertical (XX1) dudit réservoir (1).4. Installation according to one of claims 2 and 3, characterized in that the outlet (4) of the tank (1) is formed in the bottom face (6) of the tank (1) in the vicinity of the vertical axis ( XX 1 ) of said tank (1).
5. Installation selon l'une des revendications 1 à 4, caractérisée en ce que l'entrée (3) du fluide de traitement et la sortie (4) du réservoir (1) sont situées sur un même axe vertical, en particulier l'axe vertical (XX') du réservoir ( 1) .5. Installation according to one of claims 1 to 4, characterized in that the inlet (3) of the treatment fluid and the outlet (4) of the reservoir (1) are located on the same vertical axis, in particular the vertical axis (XX ') of the tank (1).
6. Installation selon la revendication 2, caractérisée en ce que la face formant fond (6) et la face du dessus (7) dudit réservoir (1) délimitent des surfaces concaves à concavité tournée vers l'intérieur du réservoir (1) pour d'une part augmenter la résistance à la pression dudit réservoir (1), d'autre part faciliter l'écoulement des fluides le long desdites faces du réservoir (1).6. Installation according to claim 2, characterized in that the bottom face (6) and the top face (7) of said tank (1) delimit concave surfaces with concavity turned towards the inside of the tank (1) for d on the one hand increase the resistance to pressure of said tank (1), on the other hand facilitate the flow of fluids along said faces of the tank (1).
7. Installation selon l'une des revendications 1 à 6, caractérisé en ce que l'organe de mesure (5) est une sonde d'un pH mètre (11).7. Installation according to one of claims 1 to 6, characterized in that the measuring member (5) is a probe of a pH meter (11).
8. Installation selon l'une des revendications 1 à 7, caractérisée en ce que la pompe doseuse (10) asservie à l'organe de mesure (5) est une pompe doseuse à volume constant reliée d'une part à l'entrée (3) de fluide de traitement dudit réservoir (1), d'autre part à un réservoir (12) de stockage du fluide de traitement, le fonctionnement de la pompe doseuse étant asservi à la valeur mesurée par ledit organe de mesure (5) par rapport à une valeur de consigne prédéterminée de préférence réglable. 8. Installation according to one of claims 1 to 7, characterized in that the metering pump (10) slaved to the measuring member (5) is a metering pump with constant volume connected on the one hand to the inlet ( 3) of treatment fluid from said reservoir (1), on the other hand to a reservoir (12) for storing treatment fluid, the operation of the metering pump being controlled by the value measured by said measurement member (5) by relative to a predetermined set value preferably adjustable.
9. Installation selon l'une des revendications 1 à 8, caractérisée en ce que le réservoir (1) est équipé dans sa partie haute d'une purge (9).9. Installation according to one of claims 1 to 8, characterized in that the tank (1) is equipped in its upper part with a drain (9).
10. Installation selon l'une des revendications 1 à 9, caractérisée en ce que le fluide de traitement est un acide ou un mélange d'acides. 10. Installation according to one of claims 1 to 9, characterized in that the treatment fluid is an acid or a mixture of acids.
PCT/FR1998/001045 1997-05-26 1998-05-26 Installation for treating fluids WO1998053903A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR97/06383 1997-05-26
FR9706383A FR2763518B1 (en) 1997-05-26 1997-05-26 PLANT FOR THE TREATMENT OF FLUIDS SUCH AS BREEDING WATER FOR ANIMALS

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WO1998053903A1 true WO1998053903A1 (en) 1998-12-03

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743598A (en) * 1971-09-02 1973-07-03 J Field Apparatus and process for mixing chemicals
GB2060422A (en) * 1979-10-23 1981-05-07 Itt Automatic circulation in waste water pumping stations
US4278546A (en) * 1975-10-22 1981-07-14 Imperial Chemical Industries Limited Treatment of a liquid by circulation and gas contacting
JPS57127428A (en) * 1981-01-29 1982-08-07 Reika Kogyo Kk Mixer
US4814074A (en) * 1987-03-03 1989-03-21 Hydroflo, Inc. Water neutralizer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743598A (en) * 1971-09-02 1973-07-03 J Field Apparatus and process for mixing chemicals
US4278546A (en) * 1975-10-22 1981-07-14 Imperial Chemical Industries Limited Treatment of a liquid by circulation and gas contacting
GB2060422A (en) * 1979-10-23 1981-05-07 Itt Automatic circulation in waste water pumping stations
JPS57127428A (en) * 1981-01-29 1982-08-07 Reika Kogyo Kk Mixer
US4814074A (en) * 1987-03-03 1989-03-21 Hydroflo, Inc. Water neutralizer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 223 (C - 133) 9 November 1982 (1982-11-09) *

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FR2763518A1 (en) 1998-11-27

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