WO2007121897A1 - Effluent purification device - Google Patents

Effluent purification device Download PDF

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Publication number
WO2007121897A1
WO2007121897A1 PCT/EP2007/003376 EP2007003376W WO2007121897A1 WO 2007121897 A1 WO2007121897 A1 WO 2007121897A1 EP 2007003376 W EP2007003376 W EP 2007003376W WO 2007121897 A1 WO2007121897 A1 WO 2007121897A1
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WO
WIPO (PCT)
Prior art keywords
effluent
aggregation
gravimetric separation
tank
purifying
Prior art date
Application number
PCT/EP2007/003376
Other languages
French (fr)
Inventor
Michel Girard
Original Assignee
Labono, Societe Par Action Simplifie
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 Labono, Societe Par Action Simplifie filed Critical Labono, Societe Par Action Simplifie
Publication of WO2007121897A1 publication Critical patent/WO2007121897A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0003—Making of sedimentation devices, structural details thereof, e.g. prefabricated parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0024—Inlets or outlets provided with regulating devices, e.g. valves, flaps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/08—Settling tanks with single outlets for the separated liquid provided with flocculating compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2405—Feed mechanisms for settling tanks
    • B01D21/2411—Feed mechanisms for settling tanks having a tangential inlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2444—Discharge mechanisms for the classified liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • B01D21/302—Active control mechanisms with external energy, e.g. with solenoid valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • B01D21/305—Control of chemical properties of a component, e.g. control of pH
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • B01D21/34—Controlling the feed distribution; Controlling the liquid level ; Control of process parameters
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate

Definitions

  • the present invention relates to a device and a method for purifying industrial effluents.
  • the treatment of these effluents can be carried out either in an autonomous station or in a collective treatment plant.
  • the treatment plant is able to treat this pollution at least as well as an industrial wastewater treatment plant
  • the sewerage network is able to drive all the industrial effluent to the purification works.
  • the industrial effluent does not contain any element likely to affect the network, the efficiency of the station or the safety of the personnel or the waste disposal sector resulting from the treatment of the water thus limiting the industrial effluent treatment possibilities by this type of installation.
  • the cost of treating these effluents by industrial effluent reprocessing companies can be very high. This is why many manufacturers have had to install devices for treating their effluents. Such devices have a small footprint, a cost of acquisition and economic operation.
  • French patent application FR-2,810,310 discloses an effluent purification device comprising a clarifying tank, a pump that draws the effluent from an enclosure placed on the upper face of the clarification tank, at least one dosing pump for adding a coagulating or flocculating reagent from the effluent situated in said enclosure and a vertical supply duct bringing the effluent added with reagents from said enclosure to the lower part of a flocculation tank arranged inside the clarification tank, in which is formed a sludge bed that the effluent crosses from bottom to top and in contact with which it clarifies.
  • the pulsations generated by the pump can create turbulent transient phases degrading the efficiency of the purification of the effluent and can generate sludge release phenomena.
  • the present invention makes it possible to improve the efficiency of the separation / filtration carried out within the flocculation tank. Indeed, thanks to the judicious sizing of the device and the flow of treatment, the flocs are kept in movement increasing their aggregation and their separation while preventing the creation of turbulent transient phases and sludge release phenomena.
  • the subject of the present invention is a device for purifying effluent by aggregation and gravimetric separation, comprising: (A) means for introducing under pressure the effluent to be clarified into the upper part of the clarification tank,
  • - (C) optionally means for adding flocculant (s) in the effluent
  • - (D) means for feeding the effluent possibly added by coagulating (s) and flocculant (s) of the upper part from the tank to the lower part thereof comprising the flocculation tank for containing a sludge bed formed at least partly of flocs, the lower part of the clarification tank and the flocculation tank transform the downflow of effluent to be purified in ascending flow, so that the effluent clarifies by gravimetric separation between the solid phase comprising the flocs and the liquid phase,
  • - (E) means for collecting and discharging the clarified effluent and freed of its solid phase, these collection means being arranged in the upper part of the tank, and characterized in that the means (B) are located downstream of the means (A) and in that it comprises means for regulating the flow rate of the effluent, which is to be purified within the vessel, and means for regulating the downward flow and then ascending in the clarification tank said flow control means being located in the upper part of the clarification vessel, and being constituted by an outer annular chamber having inlet means connected to the means (A) and outlet means communicating with the annular chamber and forming a buffer tank for the effluent and communicating with the means (D).
  • the means for regulating the flow of the effluent are constituted by a pump and / or a control system ensuring a uniform flow rate within the device.
  • control system is located downstream of the pump.
  • the control system of the pump may be constituted by an electromagnetic flowmeter with analog output proportional to the flow rate, a variable speed drive or any other element well known to those skilled in the art to ensure a constant flow downstream of the pump.
  • the establishment of a uniform flow at the device inlet allows: - to guarantee the stability of the relative dosages of the chemical treatment products used but also an optimization of the consumption of products.
  • means (F) for regulating the pH of the effluent to be treated are set upstream of the introduction means of the invention.
  • These means (F) can take the form of a tank comprising a stirrer allowing rapid stirring, a pH measuring device (pH meter) and one or two metering pump (s) enslaved at the pH meter.
  • pH meter a pH measuring device
  • s metering pump
  • the means (B) for adding coagulant (s) comprise an injection conduit connected to a pipe and the means for introducing the effluent (A).
  • the coagulant product can be injected through a metering pump controlled by the presence of liquid to be treated.
  • the device comprises at least one mixing element located downstream of the injection point of coagulating product (s).
  • the mixing element of the coagulant with the effluent is located within the feed means (A) of the effluent.
  • the in-line static mixing or mixing element is composed of a tubular structure in which one or more ellipsoidal mixing elements are fitted.
  • This device may also comprise means (C) for adding flocculant (s) comprising an injection conduit connected to a pipe, which is located at the inner apex of the means (D).
  • the device comprises pH control means located downstream of the means (C) and upstream of the means (D).
  • the clarification tank comprises in its upper part an enclosure comprising an annular chamber and a plenum chamber separated by a siphoidal partition, said annular chamber comprising a liquid inlet duct implanted tangentially and in the upper part of the outer ring of the annular chamber and a pH meter and a nozzle in the upper part of the annular chamber for the injection of acidic or basic product through a metering pump controlled by a measurement and a pH regulation and the presence of the liquid to be treated.
  • the establishment of a centrifugal mixing ring allows pH regulation and possible correction of the latter for the flocculation treatment.
  • the liquid inlet duct is configured and dimensioned by those skilled in the art so as to obtain energetic and centrifugal movement in the ring.
  • the device comprises at least one mixing element located at the top of the clarification tank.
  • these mixing elements are located in the upper part of the means (D).
  • the mixing element (s) are located in the upper part of the means (D) and downstream of the means (C).
  • the mixing element (s) are more particularly constituted by a static in-line mixer composed of a tubular structure in which one or more ellipsoidal mixing elements are fitted.
  • the mixing element (s) allows (a) intimate mixing of the flocculant (s) in the liquid to be treated, this in a non-turbulent regime to avoid breaking the flocs obtained by the coagulating treatment.
  • the design of this homogenizer consisting of one or more unitary parts allows disassembly from above. Thus, the number of unit parts constituting this homogenization device is adapted to the characteristics of the processing implemented.
  • the means (E) for collecting and evacuating the clarified effluent and having been freed from its solid phase are composed of a tubular or semi-tubular ring with a large opening concentric with the tank of clarification.
  • This height-adjustable ring is connected to a means of evacuation of wastewater, such as a hose.
  • the structure of this chute greatly reduces the risk of creating turbulence and clogging risks that are common during the flow of treated effluent through calibrated orifices.
  • an open-angle cone is created at the bottom of the flocculation tank.
  • This cone connected to an extraction orifice allows on the one hand to collect the sludge accumulating in the dead zones of the cylindrical part of the tank and, on the other hand, to facilitate their sequential or punctual extraction.
  • the clarification tank has the shape of a complete cone opening at its bottom part on an extraction pipe. This configuration promotes the thickening of the sludge while ensuring their total extraction, which limits the risk of clogging.
  • the present invention also relates to a process for purifying an effluent involving at least one vessel in which circulates a first downstream then upstream flow of effluent and wherein the effluent is subjected to aggregation and gravimetric separation allowing the effluent entrained in the upward flow to get rid of its polluting solid sediment phase, this process comprising the following successive steps: a. Introduction of the effluent into the device, b. Possible coagulation treatment of said effluent, c. Possible regulation of the pH of the coagulated effluent, d. Possible flocculation treatment, e.
  • the steps a) to e) taking place at a constant flow rate, the steps a), b) and c) being carried out in the turbulent phase and the steps d) and e) being carried out in a non-turbulent phase .
  • the process for purifying an effluent comprises an additional step of regulating the pH of the effluent carried out before the coagulation treatment.
  • the process for purifying an effluent can be carried out by means of a device as described above.
  • FIG. 1 shows in section the device according to the invention, which comprises a pH control vessel.
  • the industrial effluent purification device according to the invention comprises means for regulating the pH (F) in the form of a pH regulation vessel (4) which has in its upper part of a supply duct of industrial effluents to be treated, a pH meter (pH meter, 3) and a stirrer (1).
  • a stitching (2) allows the injection of acidic or basic product by a metering pump.
  • the means (A) for introducing the effluent under pressure can in particular be constituted by a supply line (5), a pump (6) whose flow rate is regulated by the control system (7) situated downstream of the the pump and acting directly on the operation thereof.
  • the means (B) for adding coagulant may take the form of an injection (9) by means of a metering pump.
  • the means (A) may comprise within them mixing means (8) downstream of the means (B).
  • the flow control means are in particular constituted by the enclosure (10) disposed on the upper face of the clarification tank (11).
  • the enclosure (10) is composed of a centrifugal mixing ring (interchangeably called annular chamber or mixing ring, 12) and a plenum tank (13).
  • the mixing ring (12) comprises the end of the liquid inlet duct (5) implanted tangentially and in the upper part of the outer shell of the ring.
  • a siphoid partition (14) separates the mixing ring (12) from the still tank (13).
  • the passage of the annular chamber (12), which is a restricted volume, to the plenum tank (13) allows the regulation of the hydraulic regime of the effluent.
  • the flow control means according to the invention make it possible to pass, within a single restricted space, a turbulent regime at a non-turbulent regime, that is to say two different regimes adapted to two successive treatment stages of the effluent (pH adjustment and flocculation), while maintaining a constant flow rate.
  • the present invention makes it possible to integrate all the means to carry out all the physicochemical treatment steps in a compact space.
  • Means for regulating the pH of the effluent added with coagulant may consist of a stitching (15) which allows the injection of acidic or basic product.
  • the injection of this product is carried out by a dosing pump whose operation is controlled by the measurement and regulation of the pH by the pH-meter (16) located in the still tank (13).
  • the means (C) for adding the flocculant consist of a flocculant injection duct (17) implanted at the inner apex of the supply duct (18).
  • a mixing device (19) is placed downstream of the flocculant injection device (17).
  • the means (D) for supplying the effluent possibly added by coagulating (s) and flocculating (s) from the upper part of the tank to the lower part thereof comprise the vertical supply duct (18). which extends from the enclosure (10) to the cylindrical portion (24) of the flocculation tray.
  • the latter is intended to contain a bed of sludge formed at least partly of flocs and located in the lower part of the clarification tank.
  • the flocculation tank transforms the downward flow of effluent to be purified into upflow, so that the effluent clarifies by gravimetric separation between the solid phase comprising the flocs and the liquid phase.
  • the lower part of the clarification tank advantageously takes the form of a complete cone (20) disposed concentrically inside the tank (11). It then has in its lower part an extraction pipe (21). Extraction is provided by a pump (22).
  • a flocculation tank placed inside the clarification tank (11) consists of a conical upper portion (23) extended by a cylindrical lower portion (24). Said cylindrical portion (24) is itself extended by an open-angle cone (25) at the base of the flocculation tank. This cone is connected to an extraction pipe (26). Extraction is provided by a pump (22).
  • the means (E) for collecting and evacuating the clarified effluent are constituted by a collection chute (27) consisting of a semi-tubular ring with a large opening concentric with the clarification tank. This height-adjustable ring is connected to a means of evacuation of wastewater. It can be located in the upper part of the cylindrical clarification tank (11). A hose (28) connected to the chute allows the evacuation of the clarified effluent.
  • the operation of the device described is as follows: the industrial effluent to be treated is introduced into the pH control tank (4) where the pH thereof can be modified depending on the coagulation treatment to be followed.
  • the pH regulation is performed by one (or two) metering pump (s) controlled by the pH meter.
  • the agitator (1) ensures an energetic mixing of the liquid.
  • the liquid leaves the tank (4) sucked by the operation of the feed pump (6) whose flow is controlled by the control system (7) which acts directly on the pump to ensure a uniform flow rate within of the device.
  • the injection of coagulant product is carried out at an injection device (9) situated upstream of an in-line mixing device (8) composed of a tube of suitable dimensions and one or more elements of brewing.
  • the injection of the coagulant product by a metering pump is controlled by the presence of liquid to be treated.
  • the device mixture (8) ensures rapid agitation of the liquid.
  • the effluent is introduced into the enclosure (10) via the inlet pipe (5) implanted tangentially and in the upper part of the outer ring of the centrifugal mixing ring (12), which allows pH regulation by means of the presence of a pH meter (16) for correction of the latter for the purpose of flocculation treatment.
  • a stitching (15) allows the injection of acidic or basic product.
  • the injection of such product (s) is performed by a metering pump whose operation is controlled by a measurement and pH regulation (16) and the presence of liquid to be treated.
  • This mixing ring (12) allows vigorous agitation of the effluent.
  • the effluent is then evacuated from this mixing ring (12) by a siphoid partition (14) to a plenum tank (13).
  • the liquid then enters the supply line (18) by gravity overflow where the flocculating chemical (17) is also injected.
  • the injection support is removable to facilitate maintenance and access to the homogenizer (19), which is installed below.
  • the homogenization device (19) located at the outlet of the flocculant injection point allows an intimate mixture of the flocculant product in the liquid to be treated in a non-turbulent regime.
  • the liquid thus added flocculant and homogenized then arrives in the flocculation tank.
  • the effluent is brought into contact with a bed of sludge consisting of flocs.
  • the organic or inorganic pollutants aggregate on the flocs and as it passes through the sludge bed, the effluent clarifies.
  • the flocs form the sludge bed with a higher density than the clarified effluent.
  • the latter flows out of the clarification tank into the collection chute (27) and into the hose (28) connected to said chute.
  • the device of the invention it is possible to add to the device of the invention other equipment to improve the efficiency of the treatment, such as a heating system or an ultrasonic device to promote precipitation. It is also possible to consider adding a UV treatment system, disposed at the top of the clarification tank, near the means for discharging the clarified effluent, in order to disinfect said clarified effluent. It is also possible to add a magnetic bar in the cone 20 of sludge recovery, in order to recover the metals contained in the sludge.

Abstract

The subject of the present invention is a device for the purification of industrial effluent that includes means for bringing the effluent into the device, possibly for treating the coagulation of said effluent, possibly for regulating the pH of the coagulated effluent, possibly for treating the flocculation, and separating the clarified liquid from the flocculated sludge, said device including means for regulating the inflow of the effluent to be purified into the tank and means for regulating the downflow and then the upflow in the clarifying tank. The present invention also relates to an effluent purification method implementing said device.

Description

DISPOSITIF D'EPURATION D1EFFLUENTDRAINING DEVICE D 1 EFFLUENT
La présente invention a pour objet un dispositif et un procédé de purification d'effluents industriels. Le traitement de ces effluents peut s'effectuer soit dans une station autonome, soit dans une station d'épuration collective.The present invention relates to a device and a method for purifying industrial effluents. The treatment of these effluents can be carried out either in an autonomous station or in a collective treatment plant.
Le traitement de ces effluents industriels est particulièrement réglementé. Ainsi, la réglementation française prévoit que le traitement des eaux usées peut être réalisé par une station d'épuration collective, si et seulement si :The treatment of these industrial effluents is particularly regulated. Thus, the French regulation provides that wastewater treatment can be carried out by a collective wastewater treatment plant, if and only if:
- la station d'épuration est en mesure de traiter cette pollution au moins aussi bien qu'une station d'épuration industrielle,- the treatment plant is able to treat this pollution at least as well as an industrial wastewater treatment plant,
- le réseau d'assainissement est en mesure de conduire la totalité de l'effluent industriel jusqu'à l'ouvrage d'épuration.- The sewerage network is able to drive all the industrial effluent to the purification works.
Cela signifie que l'effluent industriel ne contient aucun élément susceptible de porter atteinte au réseau, à l'efficacité de la station ou à la sécurité du personnel ni à la filière d'élimination des déchets issus du traitement de l'eau limitant ainsi les possibilités de traitement d'effluents industriels par ce type d'installation. Par ailleurs, le coût du traitement de ces effluents par des compagnies de retraitement des effluents industriels peut être très élevé. C'est pourquoi de nombreux industriels ont dû s'équiper de dispositifs de traitement de leurs effluents. De tels dispositifs présentent un encombrement réduit, un coût d'acquisition et d'exploitation économique.This means that the industrial effluent does not contain any element likely to affect the network, the efficiency of the station or the safety of the personnel or the waste disposal sector resulting from the treatment of the water thus limiting the industrial effluent treatment possibilities by this type of installation. Moreover, the cost of treating these effluents by industrial effluent reprocessing companies can be very high. This is why many manufacturers have had to install devices for treating their effluents. Such devices have a small footprint, a cost of acquisition and economic operation.
La demande de brevet français FR-2 810 310 décrit un dispositif de purification d'effluent comprenant une cuve de clarification, une pompe amenant de façon puisée l'effluent dans une enceinte placée sur la face supérieure de la cuve de clarification, au moins une pompe doseuse d'addition d'un réactif coagulant ou floculant de l'effluent situé dans ladite enceinte et un conduit d'amenée vertical amenant l'effluent additionné de réactifs depuis ladite enceinte jusqu'à la partie basse d'un bac de floculation disposé à l'intérieur de la cuve de clarification, dans lequel se forme un lit de boues que l'effluent traverse de bas en haut et au contact duquel il se clarifie.French patent application FR-2,810,310 discloses an effluent purification device comprising a clarifying tank, a pump that draws the effluent from an enclosure placed on the upper face of the clarification tank, at least one dosing pump for adding a coagulating or flocculating reagent from the effluent situated in said enclosure and a vertical supply duct bringing the effluent added with reagents from said enclosure to the lower part of a flocculation tank arranged inside the clarification tank, in which is formed a sludge bed that the effluent crosses from bottom to top and in contact with which it clarifies.
Cependant, les pulsations générées par la pompe peuvent créer des phases transitoires turbulentes dégradant l'efficacité de la purification de l'effluent et peuvent générer des phénomènes de relargage de boues.However, the pulsations generated by the pump can create turbulent transient phases degrading the efficiency of the purification of the effluent and can generate sludge release phenomena.
La présente invention permet une amélioration du rendement de la séparation/filtration réalisée au sein de la cuve de floculation. En effet, grâce au dimensionnement judicieux du dispositif et du débit de traitement, les flocs sont maintenus en mouvement augmentant leur agrégation et leur séparation tout en empêchant la création des phases transitoires turbulentes et les phénomènes de relargage de boues.The present invention makes it possible to improve the efficiency of the separation / filtration carried out within the flocculation tank. Indeed, thanks to the judicious sizing of the device and the flow of treatment, the flocs are kept in movement increasing their aggregation and their separation while preventing the creation of turbulent transient phases and sludge release phenomena.
Ainsi la présente invention a pour objet un dispositif de purification d'effluent par agrégation et séparation gravimétrique comprenant : - (A) des moyens d'introduction sous pression de l'effluent à clarifier dans la partie supérieure de cuve de clarification,Thus, the subject of the present invention is a device for purifying effluent by aggregation and gravimetric separation, comprising: (A) means for introducing under pressure the effluent to be clarified into the upper part of the clarification tank,
- (B) éventuellement des moyens d'ajout de coagulant(s) dans l'effluent à purifier,- (B) optionally means for adding coagulant (s) in the effluent to be purified,
- (C) éventuellement des moyens d'ajout de floculant(s) dans l'effluent, - (D) des moyens d'amenée de l'effluent éventuellement additionné en coagulant(s) et en floculant(s) de la partie supérieure de la cuve vers la partie inférieure de celle-ci comprenant le bac de floculation destiné à contenir un lit de boues formées au moins en partie de flocs, la partie inférieure de la cuve de clarification et le bac de floculation transforment le flux descendant d'effluent à purifier en flux ascendant, de sorte que l'effluent se clarifie par séparation gravimétrique entre la phase solide comprenant les flocs et la phase liquide,- (C) optionally means for adding flocculant (s) in the effluent, - (D) means for feeding the effluent possibly added by coagulating (s) and flocculant (s) of the upper part from the tank to the lower part thereof comprising the flocculation tank for containing a sludge bed formed at least partly of flocs, the lower part of the clarification tank and the flocculation tank transform the downflow of effluent to be purified in ascending flow, so that the effluent clarifies by gravimetric separation between the solid phase comprising the flocs and the liquid phase,
- (E) des moyens de collecte et d'évacuation de l'effluent clarifié et débarrassé de sa phase solide, ces moyens de collecte étant disposés dans la partie supérieure de la cuve, et caractérisé en ce que les moyens (B) sont situés en aval des moyens (A) et en ce qu'il comprend des moyens de régulation du débit de l'effluent, qui est à purifier au sein de la cuve, et des moyens de régulation du flux descendant puis ascendant dans la cuve de clarification, lesdits moyens de régulation du flux étant situés dans la partie supérieure de la cuve de clarification, et étant constitués par une chambre annulaire externe disposant de moyens d'entrée reliés aux moyens (A) et de moyens de sortie communiquant avec la chambre annulaire et formant un réservoir tampon pour l'effluent et communiquant avec les moyens (D).- (E) means for collecting and discharging the clarified effluent and freed of its solid phase, these collection means being arranged in the upper part of the tank, and characterized in that the means (B) are located downstream of the means (A) and in that it comprises means for regulating the flow rate of the effluent, which is to be purified within the vessel, and means for regulating the downward flow and then ascending in the clarification tank said flow control means being located in the upper part of the clarification vessel, and being constituted by an outer annular chamber having inlet means connected to the means (A) and outlet means communicating with the annular chamber and forming a buffer tank for the effluent and communicating with the means (D).
Selon un des aspects préférés de la présente invention, les moyens de régulation du débit de l'effluent sont constitués par une pompe et/ou un système de régulation assurant un débit uniforme au sein du dispositif.According to one of the preferred aspects of the present invention, the means for regulating the flow of the effluent are constituted by a pump and / or a control system ensuring a uniform flow rate within the device.
Selon un aspect particulier de l'invention, le système de régulation est situé en aval de la pompe.According to a particular aspect of the invention, the control system is located downstream of the pump.
Le système de régulation de la pompe peut être constitué par un débitmètre électromagnétique à sortie analogique proportionnelle au débit, un variateur de vitesse ou tout autre élément bien connu de l'homme du métier permettant d'assurer un débit constant en aval de la pompe.The control system of the pump may be constituted by an electromagnetic flowmeter with analog output proportional to the flow rate, a variable speed drive or any other element well known to those skilled in the art to ensure a constant flow downstream of the pump.
La mise en place d'un débit uniforme en entrée d'appareil permet de : - garantir la stabilité des dosages relatifs des produits de traitement chimique utilisés mais également une optimisation des consommations de produits.The establishment of a uniform flow at the device inlet allows: - to guarantee the stability of the relative dosages of the chemical treatment products used but also an optimization of the consumption of products.
- améliorer le rendement de l'étape de séparation/filtration réalisée au sein du lit de boues de l'ordre de 30%. Le dimensionnement de l'appareil et du débit permet le maintien de la mise en mouvement des flocs augmentant leur agrégation, donc leur séparation et créant une sorte de lit fluidisé tout en empêchant la création de phases transitoires turbulentes dégradant l'efficacité ci-dessus indiquée et pouvant générer des phénomènes de relargage de boues. Selon l'un des aspects de la présente invention, des moyens (F) de régulation de pH de l'effluent à traiter, de configuration connue de l'homme du métier, sont mis en place en amont des moyens d'introduction de l'effluent (A). Ces moyens (F) peuvent prendre la forme d'une cuve comprenant un agitateur permettant une agitation rapide, un appareil de mesure et de régulation du pH (pH-mètre) ainsi qu'une ou deux pompe(s) doseuse(s) asservies au pH-mètre. La mise en place de cette cuve de régulation de pH dépend du type d'agent coagulant utilisé. En effet, certains de ces produits fonctionnent dans des gammes de pH très strictes nécessitant une régulation du pH de l'effluent industriel pour observer une coagulation optimale.improve the efficiency of the separation / filtration step carried out within the sludge bed of the order of 30%. The sizing of the apparatus and the flow rate makes it possible to maintain the movement of the flocks increasing their aggregation, thus separating them and creating a kind of fluidized bed while preventing the creation of turbulent transient phases degrading the efficiency indicated above. and which can generate sludge release phenomena. According to one aspect of the present invention, means (F) for regulating the pH of the effluent to be treated, of a configuration known to those skilled in the art, are set upstream of the introduction means of the invention. effluent (A). These means (F) can take the form of a tank comprising a stirrer allowing rapid stirring, a pH measuring device (pH meter) and one or two metering pump (s) enslaved at the pH meter. The establishment of this pH control vessel depends on the type of coagulant used. Indeed, some of these products operate in very strict pH ranges requiring regulation of the pH of the industrial effluent to observe optimal coagulation.
Selon un aspect préféré de la présente invention, les moyens (B) d'ajout de coagulant(s) comprennent un conduit d'injection relié à une canalisation et aux moyens d'introduction de l'effluent (A).According to a preferred aspect of the present invention, the means (B) for adding coagulant (s) comprise an injection conduit connected to a pipe and the means for introducing the effluent (A).
Ainsi, le produit coagulant peut être injecté grâce à une pompe doseuse asservie à la présence de liquide à traiter.Thus, the coagulant product can be injected through a metering pump controlled by the presence of liquid to be treated.
Selon un autre aspect préférentiel de l'invention, le dispositif comprend au moins un élément de mélange situé en aval du point d'injection de produit(s) coagulant(s).According to another preferred aspect of the invention, the device comprises at least one mixing element located downstream of the injection point of coagulating product (s).
Selon un autre aspect de l'invention, l'élément de mélange du coagulant avec l'effluent est situé au sein des moyens d'amenée (A) de l'effluent.According to another aspect of the invention, the mixing element of the coagulant with the effluent is located within the feed means (A) of the effluent.
L'élément de mélange ou mélangeur statique en ligne, selon un des aspects préférés de l'invention, est composé d'une structure tubulaire dans laquelle sont ajustés un ou plusieurs éléments ellipsoïdes de mélange.The in-line static mixing or mixing element, according to one of the preferred aspects of the invention, is composed of a tubular structure in which one or more ellipsoidal mixing elements are fitted.
Ce dispositif peut également comprendre des moyens (C) d'ajout de floculant(s) comprenant un conduit d'injection relié à une canalisation, laquelle est implantée en sommet intérieur des moyens (D). Selon l'un des aspects préférés de l'invention, le dispositif comprend des moyens de régulation du pH situés en aval des moyens (C) et en amont des moyens (D).This device may also comprise means (C) for adding flocculant (s) comprising an injection conduit connected to a pipe, which is located at the inner apex of the means (D). According to one of the preferred aspects of the invention, the device comprises pH control means located downstream of the means (C) and upstream of the means (D).
Ainsi, dans le cadre de la présente invention, la cuve de clarification comprend en sa partie supérieure une enceinte comprenant une chambre annulaire et un bac de tranquillisation séparés par une cloison siphoïde, ladite chambre annulaire comprenant un conduit d'arrivée du liquide implanté tangentiellement et en partie supérieure de la virole extérieure de la chambre annulaire ainsi qu'un pH-mètre et d'un piquage en partie supérieure de la chambre annulaire permettant l'injection de produit acide ou basique grâce à une pompe doseuse asservie à une mesure et une régulation du pH et à la présence du liquide à traiter. La mise en place d'un anneau de mélange centrifuge permet une régulation de pH et une éventuelle correction de ce dernier en vue du traitement de floculation. Le conduit d'arrivée du liquide est configuré et dimensionné par l'homme du métier de façon à obtenir un mouvement énergique et centrifuge dans l'anneau.Thus, in the context of the present invention, the clarification tank comprises in its upper part an enclosure comprising an annular chamber and a plenum chamber separated by a siphoidal partition, said annular chamber comprising a liquid inlet duct implanted tangentially and in the upper part of the outer ring of the annular chamber and a pH meter and a nozzle in the upper part of the annular chamber for the injection of acidic or basic product through a metering pump controlled by a measurement and a pH regulation and the presence of the liquid to be treated. The establishment of a centrifugal mixing ring allows pH regulation and possible correction of the latter for the flocculation treatment. The liquid inlet duct is configured and dimensioned by those skilled in the art so as to obtain energetic and centrifugal movement in the ring.
Selon un autre aspect de l'invention, le dispositif comprend au moins un élément de mélange situé au sommet de la cuve de clarification.According to another aspect of the invention, the device comprises at least one mixing element located at the top of the clarification tank.
Selon un aspect préférentiel de l'invention, ces éléments de mélange sont situés dans la partie supérieure des moyens (D).According to a preferred aspect of the invention, these mixing elements are located in the upper part of the means (D).
Selon un aspect encore plus préférentiel de l'invention le(s) élément(s) de mélange sont situés dans la partie supérieure des moyens (D) et en aval des moyens (C).According to an even more preferred aspect of the invention, the mixing element (s) are located in the upper part of the means (D) and downstream of the means (C).
Le(s) élément(s) de mélange sont plus particulièrement constitués par un mélangeur statique en ligne composé d'une structure tubulaire dans laquelle sont ajustés un ou plusieurs éléments ellipsoïdes de mélange.The mixing element (s) are more particularly constituted by a static in-line mixer composed of a tubular structure in which one or more ellipsoidal mixing elements are fitted.
L'(es) élément(s) de mélange permet(tent) un mélange intime du floculant(s) dans le liquide à traiter, ceci dans un régime non turbulent afin d'éviter de casser les flocs obtenus par le traitement coagulant. La conception de ce dispositif d'homogénéisation constitué d'une ou plusieurs parties unitaires permet un démontage par le haut. Ainsi, le nombre de parties unitaires constituant ce dispositif d'homogénéisation est adapté aux caractéristiques propres au traitement mis en œuvre.The mixing element (s) allows (a) intimate mixing of the flocculant (s) in the liquid to be treated, this in a non-turbulent regime to avoid breaking the flocs obtained by the coagulating treatment. The design of this homogenizer consisting of one or more unitary parts allows disassembly from above. Thus, the number of unit parts constituting this homogenization device is adapted to the characteristics of the processing implemented.
Selon un autre aspect encore de l'invention, les moyens (E) de collecte et d'évacuation de l'effluent clarifié et débarrassé de sa phase solide sont composés d'un anneau tubulaire ou semi tubulaire à large ouverture concentrique à la cuve de clarification. Cet anneau réglable en hauteur est raccordé à un moyen d'évacuation des eaux usées, tel qu'un flexible. La structure de cette goulotte permet de réduire fortement les risques de création de turbulence et les risques de colmatage qui sont fréquents lors de l'écoulement des effluents traités par des orifices calibrés.According to another aspect of the invention, the means (E) for collecting and evacuating the clarified effluent and having been freed from its solid phase are composed of a tubular or semi-tubular ring with a large opening concentric with the tank of clarification. This height-adjustable ring is connected to a means of evacuation of wastewater, such as a hose. The structure of this chute greatly reduces the risk of creating turbulence and clogging risks that are common during the flow of treated effluent through calibrated orifices.
Selon une caractéristique particulièrement avantageuse de l'invention, un cône à angle ouvert est créé à la base de cuve de floculation. Ce cône raccordé à un orifice d'extraction permet d'une part de recueillir les boues s'accumulant dans les zones mortes de la partie cylindrique de la cuve et, d'autre part, d'en faciliter leur extraction séquentielle ou ponctuelle. La cuve de clarification a la forme d'un cône complet débouchant en sa partie inférieure sur une conduite d'extraction. Cette configuration favorise l'épaississement des boues tout en garantissant leur extraction totale, ce qui limite les risques de colmatage.According to a particularly advantageous feature of the invention, an open-angle cone is created at the bottom of the flocculation tank. This cone connected to an extraction orifice allows on the one hand to collect the sludge accumulating in the dead zones of the cylindrical part of the tank and, on the other hand, to facilitate their sequential or punctual extraction. The clarification tank has the shape of a complete cone opening at its bottom part on an extraction pipe. This configuration promotes the thickening of the sludge while ensuring their total extraction, which limits the risk of clogging.
La présente invention a également pour objet un procédé pour purifier un effluent faisant intervenir au moins une cuve dans laquelle circule un flux d'abord descendant puis ascendant d'effluent et dans laquelle l'effluent est soumis à une agrégation et une séparation gravimétrique permettant à l'effluent entraîné dans le flux ascendant de se débarrasser de sa phase solide polluante qui sédimente, ce procédé comprenant les étapes successives suivantes : a. Introduction de l'effluent dans le dispositif, b. Eventuel traitement de coagulation dudit effluent, c. Eventuelle régulation du pH de l'effluent coagulé, d. Eventuel traitement de floculation, e. séparation du liquide clarifié des boues floculées, les étapes a) à e) se déroulant à débit constant, les étapes a), b) et c) étant effectuées en phase turbulente et les étapes d) et e) étant effectuées en phase non turbulente.The present invention also relates to a process for purifying an effluent involving at least one vessel in which circulates a first downstream then upstream flow of effluent and wherein the effluent is subjected to aggregation and gravimetric separation allowing the effluent entrained in the upward flow to get rid of its polluting solid sediment phase, this process comprising the following successive steps: a. Introduction of the effluent into the device, b. Possible coagulation treatment of said effluent, c. Possible regulation of the pH of the coagulated effluent, d. Possible flocculation treatment, e. separating the clarified liquid from the flocculated sludge, the steps a) to e) taking place at a constant flow rate, the steps a), b) and c) being carried out in the turbulent phase and the steps d) and e) being carried out in a non-turbulent phase .
Selon un aspect particulier, le procédé pour purifier un effluent comprend une étape supplémentaire de régulation du pH de l'effluent effectuée avant le traitement de coagulation.In a particular aspect, the process for purifying an effluent comprises an additional step of regulating the pH of the effluent carried out before the coagulation treatment.
Selon un autre aspect encore de l'invention le procédé pour purifier un effluent peut être effectué grâce à un dispositif tel que décrit ci-dessus.According to yet another aspect of the invention the process for purifying an effluent can be carried out by means of a device as described above.
La description qui va suivre, en regard du dessin annexé à titre d'exemple non limitatif, fera bien comprendre comment l'invention peut être mise en pratique et en fera ressortir les particularités. La figure 1 montre en coupe le dispositif selon l'invention, lequel comprend une cuve de régulation de pH. Comme le montre la vue en coupe de la figure 1 , le dispositif de purification d'effluents industriels selon l'invention comprend des moyens de régulation du pH (F) sous la forme d'une cuve de régulation du pH (4) qui dispose en sa partie supérieure d'un conduit d'amenée des effluents industriels à traiter, un appareil de dosage du pH (pH-mètre, 3) ainsi qu'un agitateur (1). Un piquage (2) permet l'injection de produit acide ou basique par une pompe doseuse.The description which follows, with reference to the appended drawing by way of non-limiting example, will make it clear how the invention can be put into practice and will bring out the particularities. Figure 1 shows in section the device according to the invention, which comprises a pH control vessel. As shown in the sectional view of FIG. 1, the industrial effluent purification device according to the invention comprises means for regulating the pH (F) in the form of a pH regulation vessel (4) which has in its upper part of a supply duct of industrial effluents to be treated, a pH meter (pH meter, 3) and a stirrer (1). A stitching (2) allows the injection of acidic or basic product by a metering pump.
Les moyens (A) d'introduction sous pression de l'effluent peuvent notamment être constitués par une canalisation d'amenée (5), une pompe (6) dont le débit est régulé par le système de régulation (7) situé en aval de la pompe et agissant directement sur le fonctionnement de celle-ci.The means (A) for introducing the effluent under pressure can in particular be constituted by a supply line (5), a pump (6) whose flow rate is regulated by the control system (7) situated downstream of the the pump and acting directly on the operation thereof.
Les moyens (B) d'ajout de coagulant peuvent prendre la forme d'une injection (9) grâce à une pompe doseuse.The means (B) for adding coagulant may take the form of an injection (9) by means of a metering pump.
Les moyens (A) peuvent comprendre en leur sein des moyens de mélange (8) en aval des moyens (B). Les moyens de régulation du flux sont notamment constitués par l'enceinte (10) disposée sur la face supérieure de la cuve de clarification (11). L'enceinte (10) est composée d'un anneau de mélange centrifuge (appelé indifféremment chambre annulaire ou anneau de mélange, 12) et d'un bac de tranquillisation (13). L'anneau de mélange (12) comporte l'extrémité du conduit d'arrivée du liquide (5) implanté tangentiellement et en partie supérieure de la virole extérieure de l'anneau. Une cloison siphoïde (14) sépare l'anneau de mélange (12) du bac de tranquillisation (13). Le passage de la chambre annulaire (12), qui constitue un volume restreint, au bac de tranquillisation (13) permet la régulation du régime hydraulique de l'effluent. Plus particulièrement, les moyens de régulation du flux selon l'invention permettent de passer, au sein d'un seul espace restreint, d'un régime turbulent à un régime non turbulent, c'est-à-dire deux régimes différents adaptés à deux étapes de traitement successives de l'effluent (réglage du pH et floculation), tout en conservant un débit constant. Ainsi, la présente invention permet d'intégrer tous les moyens pour réaliser toutes les étapes de traitement physico-chimiques dans un espace compact.The means (A) may comprise within them mixing means (8) downstream of the means (B). The flow control means are in particular constituted by the enclosure (10) disposed on the upper face of the clarification tank (11). The enclosure (10) is composed of a centrifugal mixing ring (interchangeably called annular chamber or mixing ring, 12) and a plenum tank (13). The mixing ring (12) comprises the end of the liquid inlet duct (5) implanted tangentially and in the upper part of the outer shell of the ring. A siphoid partition (14) separates the mixing ring (12) from the still tank (13). The passage of the annular chamber (12), which is a restricted volume, to the plenum tank (13) allows the regulation of the hydraulic regime of the effluent. More particularly, the flow control means according to the invention make it possible to pass, within a single restricted space, a turbulent regime at a non-turbulent regime, that is to say two different regimes adapted to two successive treatment stages of the effluent (pH adjustment and flocculation), while maintaining a constant flow rate. Thus, the present invention makes it possible to integrate all the means to carry out all the physicochemical treatment steps in a compact space.
Des moyens de régulation du pH de l'effluent additionné de coagulant peuvent être constitués par un piquage (15) qui permet l'injection de produit acide ou basique. L'injection de ce produit s'effectue par une pompe doseuse dont le fonctionnement est asservi à la mesure et la régulation du pH par le pH-mètre (16) situé dans le bac de tranquillisation (13).Means for regulating the pH of the effluent added with coagulant may consist of a stitching (15) which allows the injection of acidic or basic product. The injection of this product is carried out by a dosing pump whose operation is controlled by the measurement and regulation of the pH by the pH-meter (16) located in the still tank (13).
Les moyens (C) d'ajout du floculant sont constitués par un conduit d'injection de floculant (17) implanté en sommet intérieur du conduit d'amenée (18). Un dispositif de mélange (19) est placé en aval du dispositif d'injection de floculant (17).The means (C) for adding the flocculant consist of a flocculant injection duct (17) implanted at the inner apex of the supply duct (18). A mixing device (19) is placed downstream of the flocculant injection device (17).
Les moyens (D) d'amenée de l'effluent éventuellement additionné en coagulant(s) et en floculant(s) de la partie supérieure de la cuve vers la partie inférieure de celle-ci comprennent le conduit d'amenée vertical (18) qui s'étend depuis l'enceinte (10) jusqu'à la partie cylindrique (24) du bac de floculation. Ce dernier est destiné à contenir un lit de boues formées au moins en partie de flocs et situé dans la partie inférieure de la cuve de clarification. Le bac de floculation transforme le flux descendant d'effluent à purifier en flux ascendant, de sorte que l'effluent se clarifie par séparation gravimétrique entre la phase solide comprenant les flocs et la phase liquide.The means (D) for supplying the effluent possibly added by coagulating (s) and flocculating (s) from the upper part of the tank to the lower part thereof comprise the vertical supply duct (18). which extends from the enclosure (10) to the cylindrical portion (24) of the flocculation tray. The latter is intended to contain a bed of sludge formed at least partly of flocs and located in the lower part of the clarification tank. The flocculation tank transforms the downward flow of effluent to be purified into upflow, so that the effluent clarifies by gravimetric separation between the solid phase comprising the flocs and the liquid phase.
La partie inférieure de la cuve de clarification prend avantageusement la forme d'un cône complet (20), disposée de façon concentrique à l'intérieur de la cuve (11). Elle comporte alors dans sa partie inférieure une conduite d'extraction (21). L'extraction est assurée par une pompe (22). Un bac de floculation placé à l'intérieur de la cuve de clarification (11) est constitué d'une partie supérieure conique (23) prolongée d'une partie inférieure cylindrique (24). Ladite partie cylindrique (24) est elle-même prolongée par un cône à angle ouvert (25) à la base de la cuve de floculation. Ce cône est raccordé à une conduite d'extraction (26). L'extraction est assurée par une pompe (22).The lower part of the clarification tank advantageously takes the form of a complete cone (20) disposed concentrically inside the tank (11). It then has in its lower part an extraction pipe (21). Extraction is provided by a pump (22). A flocculation tank placed inside the clarification tank (11) consists of a conical upper portion (23) extended by a cylindrical lower portion (24). Said cylindrical portion (24) is itself extended by an open-angle cone (25) at the base of the flocculation tank. This cone is connected to an extraction pipe (26). Extraction is provided by a pump (22).
Les moyens (E) de collecte et d'évacuation de l'effluent clarifié sont constitués par une goulotte de collecte (27) constituée d'un anneau semi tubulaire à large ouverture concentrique à la cuve de clarification. Cet anneau réglable en hauteur est raccordé à un moyen d'évacuation des eaux usées. Il peut être situé dans la partie haute de la cuve cylindrique de clarification (11). Un flexible (28) relié à la goulotte permet l'évacuation de l'effluent clarifié.The means (E) for collecting and evacuating the clarified effluent are constituted by a collection chute (27) consisting of a semi-tubular ring with a large opening concentric with the clarification tank. This height-adjustable ring is connected to a means of evacuation of wastewater. It can be located in the upper part of the cylindrical clarification tank (11). A hose (28) connected to the chute allows the evacuation of the clarified effluent.
Le fonctionnement du dispositif décrit est le suivant : l'effluent industriel à traiter est introduit dans la cuve de régulation pH (4) où le pH de celui-ci peut être modifié en fonction du traitement coagulant à suivre. La régulation du pH est effectuée par une (ou deux) pompe(s) doseuse(s) asservie(s) au pH-mètre. L'agitateur (1) permet d'assurer un mélange énergique du liquide. Le liquide sort de la cuve (4) aspiré par le fonctionnement de la pompe d'alimentation (6) dont le débit est contrôlé par le système de régulation (7) qui agit directement sur la pompe afin d'assurer un débit uniforme au sein du dispositif. L'injection de produit coagulant est effectuée au niveau d'un dispositif d'injection (9) situé en amont d'un dispositif de mélange en ligne (8) composé d'un tube aux dimensions adaptées et d'un ou plusieurs éléments de brassage. L'injection du produit coagulant, par une pompe doseuse est asservie à la présence de liquide à traiter. Le dispositif de mélange (8) permet d'assurer une agitation rapide du liquide. L'effluent est introduit dans l'enceinte (10) par le conduit d'arrivée (5) implanté tangentiellement et en partie supérieure de la virole extérieure de l'anneau de mélange centrifuge (12), lequel permet une régulation du pH grâce à la présence d'un pH-mètre (16) pour une correction de ce dernier en vue du traitement de floculation.The operation of the device described is as follows: the industrial effluent to be treated is introduced into the pH control tank (4) where the pH thereof can be modified depending on the coagulation treatment to be followed. The pH regulation is performed by one (or two) metering pump (s) controlled by the pH meter. The agitator (1) ensures an energetic mixing of the liquid. The liquid leaves the tank (4) sucked by the operation of the feed pump (6) whose flow is controlled by the control system (7) which acts directly on the pump to ensure a uniform flow rate within of the device. The injection of coagulant product is carried out at an injection device (9) situated upstream of an in-line mixing device (8) composed of a tube of suitable dimensions and one or more elements of brewing. The injection of the coagulant product by a metering pump is controlled by the presence of liquid to be treated. The device mixture (8) ensures rapid agitation of the liquid. The effluent is introduced into the enclosure (10) via the inlet pipe (5) implanted tangentially and in the upper part of the outer ring of the centrifugal mixing ring (12), which allows pH regulation by means of the presence of a pH meter (16) for correction of the latter for the purpose of flocculation treatment.
Perpendiculairement et par le haut de l'anneau de mélange (12), un piquage (15) permet l'injection de produit acide ou basique. L'injection de tel(s) produit(s) s'effectue par une pompe doseuse dont le fonctionnement est asservi à une mesure et régulation de pH (16) et à la présence de liquide à traiter. Cet anneau de mélange (12) permet une agitation énergique de l'effluent.Perpendicularly and from the top of the mixing ring (12), a stitching (15) allows the injection of acidic or basic product. The injection of such product (s) is performed by a metering pump whose operation is controlled by a measurement and pH regulation (16) and the presence of liquid to be treated. This mixing ring (12) allows vigorous agitation of the effluent.
L'effluent s'évacue ensuite de cet anneau de mélange (12) par une cloison siphoïde (14) vers un bac de tranquillisation (13).The effluent is then evacuated from this mixing ring (12) by a siphoid partition (14) to a plenum tank (13).
Le liquide pénètre ensuite dans la conduite d'amenée (18) par surverse gravitaire où est également injecté le produit chimique floculant (17). Le support d'injection est démontable afin de faciliter la maintenance et l'accès au dispositif d'homogénéisation (19), lequel est installé en dessous.The liquid then enters the supply line (18) by gravity overflow where the flocculating chemical (17) is also injected. The injection support is removable to facilitate maintenance and access to the homogenizer (19), which is installed below.
Le dispositif d'homogénéisation (19), situé en sortie du point d'injection de floculant permet un mélange intime du produit floculant dans le liquide à traiter dans un régime non turbulent. Le liquide ainsi additionné de floculant et homogénéisé arrive ensuite dans la cuve de floculation. Au bas du conduit d'amenée (18), l'effluent est mis en contact d'un lit de boues constitué de flocs. Au contact des flocs formant le lit de boues, les polluants organiques ou minéraux s'agrègent sur les flocs et au fur et à mesure de son passage à travers le lit de boues, l'effluent se clarifie. Les flocs forment le lit de boues d'une densité plus forte que l'effluent clarifié. Ce dernier se déverse hors de la cuve de clarification dans la goulotte de collecte (27) puis dans le flexible (28) raccordé à ladite goulotte.The homogenization device (19), located at the outlet of the flocculant injection point allows an intimate mixture of the flocculant product in the liquid to be treated in a non-turbulent regime. The liquid thus added flocculant and homogenized then arrives in the flocculation tank. At the bottom of the feed duct (18), the effluent is brought into contact with a bed of sludge consisting of flocs. In contact with the flocks forming the sludge bed, the organic or inorganic pollutants aggregate on the flocs and as it passes through the sludge bed, the effluent clarifies. The flocs form the sludge bed with a higher density than the clarified effluent. The latter flows out of the clarification tank into the collection chute (27) and into the hose (28) connected to said chute.
En cas d'augmentation de charge, les boues excédentaires se déversent hors du bac de floculation et se rassemblent au fond de la cuve de clarification (20). Elles sont extraites par la conduite d'extraction (21) laquelle est couplée à une pompe (22).In the event of a load increase, excess sludge is discharged from the flocculation tank and collects at the bottom of the clarification tank (20). They are extracted by the extraction pipe (21) which is coupled to a pump (22).
Il est possible d'ajouter au dispositif de l'invention d'autres équipements permettant d'améliorer l'efficacité du traitement, tels qu'un système de chauffage ou un dispositif à ultra-sons pour favoriser la précipitation. On peut également envisager d'ajouter un système de traitement par UV, disposé au sommet de la cuve de clarification, à proximité des moyens d'évacuation de l'effluent clarifié, afin de désinfecter ledit effluent clarifié. II est possible également d'ajouter un barreau magnétique dans le cône 20 de récupération des boues, afin de récupérer les métaux contenus dans les boues. It is possible to add to the device of the invention other equipment to improve the efficiency of the treatment, such as a heating system or an ultrasonic device to promote precipitation. It is also possible to consider adding a UV treatment system, disposed at the top of the clarification tank, near the means for discharging the clarified effluent, in order to disinfect said clarified effluent. It is also possible to add a magnetic bar in the cone 20 of sludge recovery, in order to recover the metals contained in the sludge.

Claims

REVENDICATIONS
1. Dispositif de purification d'effluent par agrégation et séparation gravimétrique comprenant : - (A) des moyens d'introduction sous pression de l'effluent à clarifier dans la partie supérieure d'une cuve de clarification (11),1. Device for purification of effluent by aggregation and gravimetric separation comprising: - (A) means for introducing under pressure the effluent to be clarified in the upper part of a clarification tank (11),
- (B) éventuellement des moyens (9) d'ajout de coagulant(s) dans l'effluent à purifier,- (B) optionally means (9) for adding coagulant (s) in the effluent to be purified,
- (C) éventuellement des moyens (17) d'ajout de floculant(s) dans l'effluent, - (D) des moyens d'amenée de l'effluent éventuellement additionné en coagulant(s) et en floculant(s) de la partie supérieure de la cuve (11) vers la partie inférieure de celle-ci comprenant le bac de floculation (23, 24, 25) destiné à contenir un lit de boues formées au moins en partie de flocs, la partie inférieure de la cuve de clarification (11) et le bac de floculation transformant le flux descendant d'effluent à purifier en flux ascendant, de sorte que l'effluent se clarifie par séparation gravimétrique entre la phase solide comprenant les flocs et la phase liquide,- (C) optionally means (17) for adding flocculant (s) into the effluent, - (D) means for feeding the effluent possibly added by coagulating (s) and flocculant (s) of the upper part of the tank (11) towards the lower part thereof comprising the flocculation tank (23, 24, 25) intended to contain a bed of sludge formed at least in part of flocs, the lower part of the tank clarifying agent (11) and the flocculation tank transforming the downstream flow of effluent to be purified into an upflow, so that the effluent clarifies by gravimetric separation between the solid phase comprising the flocs and the liquid phase,
- (E) des moyens de collecte et d'évacuation de l'effluent clarifié et débarrassé de sa phase solide, ces moyens de collecte étant disposés dans la partie supérieure de la cuve; caractérisé en ce que les moyens (B) sont situés en aval des moyens (A) et en ce qu'il comprend des moyens (5, 6, 7, 8) de régulation du débit de l'effluent, qui est à purifier au sein de la cuve, et des moyens (10) de régulation du flux descendant puis ascendant dans la cuve de clarification, lesdits moyens (10) de régulation du flux étant situés dans la partie supérieure de la cuve de clarification (11), et étant constitués par une chambre annulaire (12) externe disposant de moyens d'entrée reliés aux moyens (A) et de moyens de sortie communiquant avec la chambre annulaire et formant un réservoir tampon pour l'effluent et communiquant avec les moyens (D).- (E) means for collecting and discharging the clarified effluent and freed of its solid phase, these collection means being arranged in the upper part of the tank; characterized in that the means (B) are located downstream of the means (A) and in that it comprises means (5, 6, 7, 8) for regulating the flow of the effluent, which is to be purified at within the vessel, and means (10) for regulating the downward flow and then ascending in the clarification vessel, said flow control means (10) being located in the upper part of the clarification tank (11), and being constituted by an outer annular chamber (12) having inlet means connected to the means (A) and outlet means communicating with the annular chamber and forming a buffer tank for the effluent and communicating with the means (D).
2. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon la revendication 1 , caractérisé en ce qu'il comprend des moyens (1 , 2, 3, 4) de régulation du pH (F) de l'effluent à traiter situés en amont des moyens d'introduction de l'effluent (A).2. Device for purifying effluent by aggregation and gravimetric separation according to claim 1, characterized in that it comprises means (1, 2, 3, 4) for regulating the pH (F) of the effluent to be treated situated. upstream of the means for introducing the effluent (A).
3. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon l'une des revendications 1 ou 2, caractérisé en ce que les moyens de régulation du débit de l'effluent sont constitués par une pompe (6) et/ou un système (7) de régulation assurant un débit uniforme au sein du dispositif.3. Device for purifying effluent by aggregation and gravimetric separation according to one of claims 1 or 2, characterized in that the means for regulating the flow of the effluent are constituted by a pump (6). and / or a control system (7) providing a uniform flow rate within the device.
4. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon la revendication 3, caractérisé en ce que le système de régulation (7) est situé en aval de la pompe (6).4. effluent purification device by aggregation and gravimetric separation according to claim 3, characterized in that the control system (7) is located downstream of the pump (6).
5. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon la revendication 3 ou 4, caractérisé en ce que le système de régulation (7) est constitué par un débitmètre électromagnétique à sortie analogique proportionnelle au débit.5. effluent purification device by aggregation and gravimetric separation according to claim 3 or 4, characterized in that the control system (7) is constituted by an electromagnetic flowmeter with analog output proportional to the flow rate.
6. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon l'une des revendications 1 à 5, caractérisé en ce que les moyens (B) d'ajout de coagulant(s) comprennent un conduit d'injection relié à une canalisation et aux moyens (A).6. Device for purifying effluent by aggregation and gravimetric separation according to one of claims 1 to 5, characterized in that the means (B) for adding coagulant (s) comprise an injection conduit connected to a pipe and the means (A).
7. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon la revendication 6, caractérisé en ce qu'il comprend au moins un élément de mélange situé en aval du point d'injection des moyens (B) d'ajout de coagulant(s).7. Device for purifying effluent by aggregation and gravimetric separation according to claim 6, characterized in that it comprises at least one mixing element located downstream of the injection point of the coagulant addition means (B) ( s).
8. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon la revendication 7, caractérisé en ce que l'élément de mélange du coagulant se situe au sein des moyens (A).8. effluent purification device by aggregation and gravimetric separation according to claim 7, characterized in that the mixing element of the coagulant is within the means (A).
9. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon la revendication 7 ou 8, caractérisé en ce que les moyens de mélange sont composés d'une structure tubulaire, dans laquelle sont ajustés un ou plusieurs éléments ellipsoïdes de mélange.9. A device for purifying effluent by aggregation and gravimetric separation according to claim 7 or 8, characterized in that the mixing means are composed of a tubular structure, in which are fitted one or more ellipsoidal mixing elements.
10. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon l'une des revendications 1 à 9, caractérisé en ce que les moyens (C) d'ajout de floculant(s) comprennent un conduit d'injection relié à une canalisation, laquelle est implantée en sommet intérieur des moyens (D).10. Device for purifying effluent by aggregation and gravimetric separation according to one of claims 1 to 9, characterized in that the means (C) for adding flocculant (s) comprise an injection conduit connected to a pipe which is located at the inner apex of the means (D).
11. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon la revendication 10, caractérisé en ce que des moyens de régulation du pH (15, 16) sont situés en aval des moyens (C) et en amont des moyens (D).11. Device for purifying effluent by aggregation and gravimetric separation according to claim 10, characterized in that means for pH regulation (15, 16) are located downstream means (C) and upstream means (D).
12. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon l'une des revendications 1 à 1 1 , caractérisé en ce que le dispositif comprend au moins un élément de mélange (19) situé au sommet de la cuve.12. Device for purifying effluent by aggregation and gravimetric separation according to one of claims 1 to 1 1, characterized in that the device comprises at least one mixing element (19) located at the top of the tank.
13. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon la revendication 12, caractérisé en ce que le(s) élément(s) de mélange sont situés dans la partie supérieure des moyens (D).13. effluent purification device by aggregation and gravimetric separation according to claim 12, characterized in that the (s) element (s) mixing are located in the upper part of the means (D).
14. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon la revendication 13, caractérisé en ce que le(s) élément(s) de mélange sont situés dans la partie supérieure des moyens (D) et en aval des moyens (C).14. A device for purifying effluent by aggregation and gravimetric separation according to claim 13, characterized in that the mixing element (s) are located in the upper part of the means (D) and downstream of the means (C). ).
15. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon l'une des revendications 12 à 14, caractérisé en ce que les éléments de mélange sont constitués par une structure tubulaire, dans laquelle sont ajustés un ou plusieurs éléments ellipsoïdes de mélange.15. A device for purifying effluent by aggregation and gravimetric separation according to one of claims 12 to 14, characterized in that the mixing elements are constituted by a tubular structure, in which are fitted one or more ellipsoidal mixing elements.
16. Dispositif de purification d'effluent par agrégation et séparation gravimétrique selon l'une des revendications 1 à 15, dans lequel les moyens (E) de collecte et d'évacuation de l'effluent clarifié et débarrassé de sa phase solide sont composés d'un anneau tubulaire à large ouverture concentrique à la cuve de clarification raccordé à un flexible (28).16. Device for purifying effluent by aggregation and gravimetric separation according to one of claims 1 to 15, wherein the means (E) for collecting and discharging the clarified effluent and stripped of its solid phase are composed of a tubular ring with a large opening concentric with the clarification tank connected to a hose (28).
17. Procédé pour purifier un effluent faisant intervenir au moins une cuve dans laquelle circule un flux d'abord descendant puis ascendant d'effluent et dans laquelle l'effluent est soumis à une agrégation et une séparation gravimétrique permettant à l'effluent entraîné dans le flux ascendant de se débarrasser de sa phase solide polluante qui sédimente, ce procédé comprenant les étapes successives suivantes : a. Introduction de l'effluent dans le dispositif, b. Eventuel traitement de coagulation dudit effluent, c. Eventuelle régulation du pH de l'effluent coagulé, d. Eventuel traitement de floculation, e. séparation du liquide clarifié des boues floculées, ledit procédé étant effectué grâce à un dispositif selon l'une quelconque des revendications 1 à 16, caractérisé en ce que les étapes a) à e) se déroulent à débit constant, que les étapes a), b) et c) sont effectuées en phase turbulente et en ce que les étapes d) et e) sont effectuées en phase non turbulente.17. A process for purifying an effluent involving at least one vessel in which flows a first downstream then upstream flow of effluent and in which the effluent is subjected to aggregation and gravimetric separation allowing the effluent entrained in the effluent. ascending stream to get rid of its sediment polluting solid phase, this process comprising the following successive steps: a. Introduction of the effluent into the device, b. Possible coagulation treatment of said effluent, c. Possible regulation of the pH of the coagulated effluent, d. Possible flocculation treatment, e. separation of clarified liquid from flocculated sludge, said method being carried out by means of a device according to any one of claims 1 to 16, characterized in that steps a) to e) proceed at a constant rate, that steps a), b) and c) are carried out in turbulent phase and in that steps d) and e) are performed in non-turbulent phase.
18. Procédé pour purifier un effluent selon la revendication 17, caractérisé en ce qu'une étape supplémentaire de régulation du pH de l'effluent est effectuée avant le traitement de coagulation. 18. Process for purifying an effluent according to claim 17, characterized in that an additional step of regulating the pH of the effluent is performed before the coagulation treatment.
PCT/EP2007/003376 2006-04-18 2007-04-17 Effluent purification device WO2007121897A1 (en)

Applications Claiming Priority (2)

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FR06/03408 2006-04-18
FR0603408A FR2899823B1 (en) 2006-04-18 2006-04-18 EFFLUENT PURIFICATION DEVICE

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Cited By (3)

* Cited by examiner, † Cited by third party
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DE202008004768U1 (en) 2008-04-04 2008-06-05 Db Netz Ag Device for detecting the maintenance and wear condition of the hydraulic systems of track-mounted auxiliary vehicles
GB2488995A (en) * 2011-03-14 2012-09-19 Cde Global Ltd Solid and liquid separation
CN103111103A (en) * 2013-02-28 2013-05-22 闵方权 Rotational flow centrifugal separation device

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DE1066997B (en) * 1959-10-15 Gutehoffnungshütte Sterkrade Aktiengesellschaft, Oberhausen (RhId.) Device for clarifying contaminated liquids by settling, especially saturated sugar juice
FR2250557A1 (en) * 1973-11-14 1975-06-06 Alsthom Cgee
DE3409107A1 (en) * 1984-03-13 1985-09-26 Adalbert Dr.-Ing. 8500 Nürnberg Nagy Process and apparatus for separating solids from the carrier liquid in suspensions and a centrifuge suitable therefor
FR2810310A1 (en) * 2000-06-15 2001-12-21 Htci Industrial waste water treatment apparatus comprises coagulating or flocculating agents and effluent mixed in container and supplied to flocculation vat in bottom of clarifying tank

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1066997B (en) * 1959-10-15 Gutehoffnungshütte Sterkrade Aktiengesellschaft, Oberhausen (RhId.) Device for clarifying contaminated liquids by settling, especially saturated sugar juice
FR2250557A1 (en) * 1973-11-14 1975-06-06 Alsthom Cgee
DE3409107A1 (en) * 1984-03-13 1985-09-26 Adalbert Dr.-Ing. 8500 Nürnberg Nagy Process and apparatus for separating solids from the carrier liquid in suspensions and a centrifuge suitable therefor
FR2810310A1 (en) * 2000-06-15 2001-12-21 Htci Industrial waste water treatment apparatus comprises coagulating or flocculating agents and effluent mixed in container and supplied to flocculation vat in bottom of clarifying tank

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008004768U1 (en) 2008-04-04 2008-06-05 Db Netz Ag Device for detecting the maintenance and wear condition of the hydraulic systems of track-mounted auxiliary vehicles
GB2488995A (en) * 2011-03-14 2012-09-19 Cde Global Ltd Solid and liquid separation
GB2488995B (en) * 2011-03-14 2013-05-29 Cde Global Ltd Apparatus for separating solids from a liquid suspension thereof
CN103111103A (en) * 2013-02-28 2013-05-22 闵方权 Rotational flow centrifugal separation device

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FR2899823A1 (en) 2007-10-19

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