EP1397310A2 - Dispositif de decantation et procede permettant d'eliminer les boues d'un liquide - Google Patents

Dispositif de decantation et procede permettant d'eliminer les boues d'un liquide

Info

Publication number
EP1397310A2
EP1397310A2 EP02738132A EP02738132A EP1397310A2 EP 1397310 A2 EP1397310 A2 EP 1397310A2 EP 02738132 A EP02738132 A EP 02738132A EP 02738132 A EP02738132 A EP 02738132A EP 1397310 A2 EP1397310 A2 EP 1397310A2
Authority
EP
European Patent Office
Prior art keywords
liquid
desludging
outlet
desludging device
total volume
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02738132A
Other languages
German (de)
English (en)
Inventor
Paolo Giordani
Fabio Musiani
Vittorio Degara
Dario Negri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP1397310A2 publication Critical patent/EP1397310A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/36—Regeneration of waste pickling liquors
    • 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
    • B01D21/0018—Separation of suspended solid particles from liquids by sedimentation provided with a pump mounted in or on a settling tank
    • B01D21/0021—Separation of suspended solid particles from liquids by sedimentation provided with a pump mounted in or on a settling tank provided with a jet pump
    • 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
    • B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
    • 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
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0045—Plurality of essentially parallel plates
    • 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
    • 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
    • B01D21/2427—The feed or discharge opening located at a distant position from the side walls
    • 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
    • B01D21/245—Discharge mechanisms for the sediments
    • B01D21/2466—Mammoth pumps, e.g. air lift pumps
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2221/00—Applications of separation devices
    • B01D2221/14—Separation devices for workshops, car or semiconductor industry, e.g. for separating chips and other machining residues
    • 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
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • 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
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes

Definitions

  • the present invention relates to a new method for desludging a liquid and a desludging device suitable therefor. It is suitable for desludging a large number of different liquids, in particular water, which contain solids which sediment as sludge or in which such solids are formed due to a chemical reaction. Examples of such liquids are waste water which already contains sludge or in which sludge formation occurs as a result of a precipitation reaction, a metalworking liquid, a cleaning liquid, a pickling solution for pickling metal surfaces or a conversion solution for conversion treatment of metal surfaces.
  • the volume of liquid to be desludged is in a sedimentation tank or is passed through such a tank.
  • the liquid is largely at rest or at most in a slowly flowing movement, so that sludge can collect at the bottom of the sedimentation tank.
  • the bottom is usually either inclined to one side or tapers to one point, whereby the sludge accumulates at the lowest point and can be discharged from there to the outside.
  • the object of the present invention is to provide a device and a method in which a (small) partial volume is to be taken from a total volume of a liquid containing sludge in the most solid-free form possible. For this it is necessary to separate as much of the sludge as possible from the liquid to be removed.
  • This sludge to be separated represents only a small proportion of the total sludge present in the total volume of the liquid, so that it is generally not worthwhile to separate this (small) sludge fraction from the remaining amount of sludge in the total volume of the liquid and dispose of it separately.
  • the invention relates to a desludging device (a), (b) for a portion of a total volume of a liquid which contains suspended solid or which can form sludge, arranged in a container for the total volume of the liquid, so that at least a part of the Desludging device, including its bottom, is immersed in the total volume, the desludging device having an inlet opening (f) above the bottom through which a portion of the liquid can penetrate into the desludging device, as well as an outlet device (g) in the form of a drain line, one Channel, a weir or at least an opening in the wall through which liquid can be removed from the desludging device, the bottom of the desludging device having at least one outlet opening (h) through which sludge settled in the desludging device into the Gesa volume of the liquid can be returned or to another settling device for thickening the sludge.
  • a desludging device (a), (b) for a portion of a total volume of
  • the desludging device is characterized in one embodiment in that it is at least partially immersed and at least with its lower end (bottom) in the total volume of the liquid, from which only a portion is to be desludged.
  • the sludge settling within the sludge removal device is continuously or discontinuously returned to the total volume of the liquid through one or more outlet openings at the bottom of the sludge removal device. This can be due to gravity or through mechanical aids such as a pump.
  • This desludging device can have any shape as long as it fulfills the task that the liquid in it flows only so slowly that the sludge sinks down and accumulates at the bottom of the desludging device.
  • the horizontal cross section of the desludging device can take on any shape, for example circular, elliptical, rectangular or square. A rectangular or square horizontal cross section is preferred for reasons of optimal use of space.
  • the desludging device is designed in such a way that it has an upper part (a) and a lower part (b), the walls of the upper part being substantially perpendicular and the walls of the lower part being inclined in such a way that the cross section of the lower part tapers downwards, the upper part being divided by a partition (c) into an inlet part (d) and an outlet part (e) for the liquid, the inlet opening (f) for the liquid being provided in the inlet part , wherein the liquid moves downwards in the inlet part and upwards in the outlet part and wherein the outlet device (g) begins in the outlet part, through which liquid can be removed from the outlet part, with an outlet opening at the lowest and narrowest point of the lower part (h) is present, through the sludge deposited in the desludging device into the total volume of the liquid can be traced back.
  • the desludging device thus consists of an upper part with essentially vertical walls and a lower part which tapers downwards in the direction of the outlet opening.
  • the upper part is separated by a partition into an inlet part and an outlet part, the volume of the inlet part preferably being less than the volume of the outlet part.
  • Liquid can penetrate into the inlet part through an inlet opening, which can exist either through the upper boundary of the inlet part or through an opening in the side wall.
  • the liquid in the inlet part moves down and up in the outlet section. If the volume of the outlet part is greater than that of the inlet part, the flow velocity in the outlet part is lower than in the inlet part. As a result, the sludge can settle down in the outlet part and accumulate in the lower, tapering part of the desludging device. There it can be returned continuously or discontinuously into the total volume of the liquid through the outlet opening.
  • a more specific embodiment of the invention lies in a desludging device for desludging a liquid, consisting of an upper (a) and a lower (b) part, the walls of the upper part being substantially vertical and the walls of the lower part being inclined, that the cross section of the lower part tapers downwards, the upper part being divided by a partition (c) into an inlet part (d) and an outlet part (e) for the liquid, and an inlet opening (f) for the liquid in the inlet part is provided, with the liquid moving downwards in the inlet part and upwards in the outlet part and the outlet part being divided into two or more segments (k) by one or more guide plates (i) and an outlet device (g) in the form above the guide plates a drain line, a channel, a weir or at least an opening in the wall through which the liquid begins s can be discharged to the outlet part, whereby at the deepest and narrowest point of the lower part there is an outlet opening (h) which opens into the outer tube (m) of an ejection
  • the outlet part is divided by one or more guide plates into 2 or more segments, the start of the outlet device being above these guide plates.
  • the baffles ensure a largely laminar upward flow of the liquid in the outlet part and thereby promote the settling of the sludge.
  • the Outlet opening in the lower part of the desludging device possibly with the aid of a connecting pipe, leads into an ejection nozzle through which the sludge accumulated in the desludging device can be conveyed back into the total volume of the liquid.
  • This ejection nozzle contains an outer and an inner tube, which run essentially parallel to each other.
  • the outer tube is at the end at which the inner tube enters the outer tube for.
  • the desludging device is preferably made of a material that is attacked as little as possible by the liquid to be desludged.
  • Preferred materials are plastics or stainless steel, preferably high-alloy stainless steel.
  • the desludging device is equipped with a "venturi-like" ejection nozzle as described above, it is not necessary for it to be immersed in the total volume of the liquid.
  • the desludging device can also be attached to the outside of the container for the total volume of the liquid in such a way that a part of the liquid can penetrate through the inlet opening into the inlet part of the desludging device and that the outer tube of the ejection nozzle ends within the total volume of the liquid.
  • the effect according to the invention is also achieved in this way that a deflated portion of the total volume of the Liquid can be removed and the sludge separated from this portion is returned to the total volume of the liquid.
  • the desludging device lies within the container for the total volume of the liquid.
  • the inlet opening can represent the upper end of the desludging device, provided that the upper end is below the liquid level in the container for the total volume of the liquid.
  • the inlet opening lies in the inlet part.
  • the inlet opening can be designed as a simple opening with a sufficiently large cross section.
  • the inlet opening is either equipped as a sieve plate, that is to say it consists of a large number of smaller openings, or that it is closed with a net. It is further preferred that part of the side wall of the desludging device, which contains the inlet opening configured as a sieve plate or having a sieve, can easily be removed from the rest of the desludging device for cleaning purposes and reinserted.
  • the inlet opening in the desludging device is below the liquid level of the total volume of the liquid, this has the additional advantage that within the desludging device, in particular in an existing inlet part, specifically lighter substances than the main component of the liquid to be desludged can settle upwards and not in the Reach outlet part where they could interfere with the settling of the sludge due to their upward flow.
  • specifically lighter substances can be oils, for example, if the liquid to be desludged is an oil-in-water emulsion. This can be the case, for example, if the liquid to be desludged is a cleaning liquid, a metalworking liquid or a waste water.
  • the components that separate upwards can also be air bubbles if air is introduced into the total volume of the liquid. For example, this is In the case of pickling baths for pickling surfaces, this is often the case in which air is introduced for better mixing and, if necessary, for oxidizing oxidizable components.
  • the initial part of the outlet device can consist of an open tube.
  • the initial part of the outlet device consists of a piece of pipe which contains several openings through which the liquid can penetrate into the piece of pipe.
  • the desludging device contains an outlet part which is separated from an inlet part by a partition wall.
  • the pipe section provided with holes preferably extends over the entire distance between the partition wall to the inlet part and the opposite wall of the desludging device. If the outlet part is divided into segments by guide plates, the starting piece of the outlet device preferably contains exactly as many holes for the entry of the liquid as the outlet part has segments.
  • a hole is preferably located above a segment.
  • the initial part of the outlet device could be box-shaped, one surface of the box, preferably the lower one, having a plurality of holes for the liquid to enter the box-shaped initial part of the outlet device.
  • the liquid is preferably conveyed in the outlet device by means of a pump.
  • the desludging device has a rectangular or square horizontal cross section for reasons of space and that the lower part, if present, has the shape of an inverted rectangular or square pyramid. It is preferable for reasons of space and efficiency that the total height of the desludging device is greater than the longest side of the horizontal cross section.
  • the outlet section is divided into segments by parallel guide plates. It is preferable to provide one to 30, in particular 5 to 15, guide plates, which preferably run in parallel. For settling the sludge, it is particularly favorable if the height of the guide plates is 5 to 30 times, in particular 10 to 20 times the distance between the guide plates. For reasons of space and the efficiency of the sludge separation, it is preferred that the desludging device has a rectangular horizontal cross section and that the long side of the rectangle is 1.5 to 5 times as long, in particular 1.5 to 3 times as long, for example approximately twice is as long as the short side. It is again particularly advantageous for sludge separation if the partition between the inlet part and the outlet part and, if present, the guide plates in the outlet part are arranged essentially parallel to the short side of the rectangle.
  • the guide plates are preferably arranged regardless of the cross section of the desludging device so that they are inclined between 0 and 30 ° to the vertical.
  • an inclination to the vertical that is to say an oblique arrangement
  • an oblique arrangement is more favorable for separating the sludge than a largely vertical arrangement.
  • the distance between the guide plates is preferably between 10 and 100 mm, in particular between 20 and 60 mm.
  • the invention in a second aspect, relates to a method for desludging a portion of a total volume of a liquid, using a desludging device as described above.
  • This method differs from the prior art in that the sludge which separates is not separated and disposed of, but is instead returned to the total volume of the liquid. It can then be disposed of together with the remaining sludge which separates out in the total volume of the liquid.
  • a method is preferred in which a desludging device according to one or more of the claims. 3 to 10 is used, the desludging device being so immersed in the total volume of the liquid that liquid can penetrate through the inlet opening into the inlet part and a first portion of the penetrating liquid is discharged through the outlet device and into it second portion is conveyed back into the total volume of the liquid through the ejection nozzle due to the suction effect of the material flow fed into the inner tube of the ejection nozzle from outside the desludging device. This second part takes the sludge with it.
  • a desludging device is therefore preferably used, which is divided into an inlet part and an outlet part, the outlet part being divided into segments by guide plates. Furthermore, a "Venturi-like" ejection nozzle is preferably provided for conveying the settled sludge back into the total volume of the liquid.
  • What the material flow fed into the inner tube of the ejection nozzle preferably consists of depends on the type of liquid to be desludged and the technical process that takes place in the total volume of the liquid.
  • this material flow consists of the same liquid as the liquid to be desludged.
  • this has the effect that a partial flow of the liquid is pumped around. This is the case in many technical processes, where the total volume is better mixed due to the pumping.
  • pumping over can be used to change the temperature of the pumped liquid, for example to cool or heat the liquid.
  • the material flow fed into the inner tube of the ejection nozzle can consist of water or an aqueous solution of active substances. If the total volume of the liquid is to be gassed, for example to be aerated, the air stream fed into the inner tube of the ejection nozzle can consist of this gas, in particular of air.
  • the material flow fed into the inner tube of the ejection nozzle is therefore preferably selected so that it has a technical effect within the total volume of the liquid.
  • the flow rate of the liquid flowing upwards in the outlet part is regulated so that settling of the sludge is ensured.
  • the optimal flow rate depends on the specific weight of the sludge, the geometric shape of the sludge particles and the viscosity of the liquid.
  • the amounts of the liquid penetrating through the inlet opening into the desludging device and leaving the sludge device through the discharge device and the ejection nozzle are preferably regulated such that the liquid in the discharge part is at a speed between 0.3 and 6 mm / sec , moved up.
  • a flow rate can be regulated in the upper half of this area, in the case of specifically lighter and flaky sludge in the lower half of this area.
  • the liquid in the outlet part at a speed between 0.6 and 3 mm / sec. moved up.
  • the liquid to be desludged is, for example, a pickling solution for pickling metal surfaces, in particular stainless steel surfaces, and the sludge which settles out is a pickling sludge
  • the liquid flow is preferably regulated so that the liquid in the outlet part is at a speed between 0.8 and 1.5 mm / sec. moved up.
  • this regulation presupposes that the horizontal cross-section of the desludging device and in particular the horizontal cross-section of the outlet part. chooses that the desired proportion of liquid can be removed through the outlet device of the desludging device while setting the flow rates mentioned. For example, if the volume of the liquid to be removed by the discharge device is in the range of approximately 100 ml / se ⁇ , it can be calculated which cross-section the discharge part of the desludging device must have in order to obtain the desired speed of movement of the liquid in the discharge part.
  • the total volume of the desludging device and the amounts of the liquid entering the desludging device and leaving it through the discharge device and the ejection nozzle are preferably selected so that the inside the liquid located in the desludging device 1 to 5 times an hour, preferably 2 to 4 times an hour.
  • these quantities can be adjusted so that the liquid within the desludging device is completely exchanged in about 15 to about 30 minutes.
  • These values are optimized for the special application that the liquid to be desludged is a pickling liquid for stainless steel and that a sludge-free representative sample is to be taken for analysis purposes by the outlet device.
  • the liquid to be desludged can be of very different types.
  • it can be a waste water that either already contains sludge or in which sludge formation takes place due to chemical processes.
  • a chemical process can represent, for example, a precipitation or neutralization reaction that is used to treat the waste water.
  • the liquid can be a metalworking liquid such as, for example, a cooling lubricant for metal cutting or a rolling oil emulsion. This creates sludge from metal abrasion on the workpiece.
  • it can be a cleaning liquid into which sludge-forming solids are introduced via the material to be cleaned.
  • the liquid can be a pickling solution for pickling metal surfaces.
  • the liquid can also be a conversion solution for a conversion treatment of metal surfaces, that is to say a chemical conversion of a metal surface.
  • a conversion solution for a conversion treatment of metal surfaces that is to say a chemical conversion of a metal surface.
  • a special example of this is a phosphating solution for the layer-forming or non-layer-forming phosphating of metal surfaces, in particular a zinc phosphating solution.
  • Such phosphating solutions tend to form sludge containing metal phosphates.
  • the desludged portion of the liquid which can be removed through the outlet part and the outlet device of the desludging device, can be used for different purposes.
  • this part of the liquid can be used to characterize the composition of the liquid by analytical determinations. It is particularly provided according to the invention that the portion of the liquid removed through the outlet part and the outlet device of the desludging device is fed to an analysis device which automatically determines one or more parameters for the composition of the liquid.
  • the desludging process according to the invention can therefore vary in the context of an automatic analytical monitoring Process baths are used, as is known in the prior art. Automatic checking and control of cleaning baths is described, for example, in documents DE 198 02 725, DE 198 14 500 and DE 198 20 800.
  • the method according to the invention is to be used to control a pickling solution, it can, for example, be preceded by a determination method as described in WO 00/33061. This method has been developed especially for the monitoring and control of nitric acid-free pickling liquids for stainless steel. Such pickling solutions are characterized, for example, in documents EP-A-505606 and EP-A-582 121.
  • An advantage of the method according to the invention is therefore to provide desludged bath samples for known or new automatic methods for checking and controlling the composition of technical baths.
  • the desludging process preferably runs automatically, so that human intervention is not required to provide a desludged bath sample.
  • a side effect of the method according to the invention is that when an ejection nozzle is used, vortices are generated in the total volume of the liquid, which ensure that sludge which separates out in the total volume of the liquid accumulates at selected points on the bottom of the container for the total volume of the liquid. This sludge can then preferably be withdrawn from the total volume of the liquid at these points, for example by suction. As a result, the desludging of the total volume of the liquid can be operated more economically, since it is possible to remove the sludge in a targeted manner at the points where it preferably collects due to the implementation of the method according to the invention.
  • an additional benefit of the method according to the invention and thus a further aspect of the present invention lies in the fact that a sludge removal device with an ejection nozzle according to one or more of claims 3 to 10 is used in the desludging method according to the invention and that the ejection nozzle is oriented in such a way in the total volume of the liquid that sludge settling in the total volume of the liquid accumulates due to the vortex formation in certain areas of the total volume, from where it can be drawn off and separated off by an external further desludging device.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Dispositif de décantation pour une partie d'un volume total de liquide qui contient des matières solides en suspension et / ou qui peut former des boues. Ledit dispositif est placé dans une cuve contenant le volume total du liquide si bien qu'au moins une partie dudit dispositif de décantation, dont son fond, est immergé dans le volume total. Ce dispositif de décantation possède un orifice d'entrée, situé au-dessus du fond, par lequel une partie du liquide peut pénétrer dans le dispositif de décantation, ainsi qu'un élément de décharge commençant au-dessus du fond, sous forme de conduite de sortie, de canal, de déversoir à chute libre ou tout au moins d'un orifice dans la paroi, par lequel le liquide peut être prélevé du dispositif de décantation. Le fond du dispositif de décantation comporte au moins un orifice de sortie par lequel les boues qui se sont déposées dans le dispositif de décantation peuvent être renvoyées dans le volume total du liquide ou acheminées vers une autre installation de décantation destinée à épaissir les boues. De préférence, les boues déposées sont réintroduites dans le volume total par une buse de type venturi. Le dispositif de décantation selon la présente invention est adapté en particulier pour la mise en oeuvre d'un procédé de prélèvement d'échantillons de bain desquels les boues ont été éliminées, à des fins d'analyse.
EP02738132A 2001-06-09 2002-05-31 Dispositif de decantation et procede permettant d'eliminer les boues d'un liquide Withdrawn EP1397310A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10128062A DE10128062A1 (de) 2001-06-09 2001-06-09 Entschlammungseinrichtung und Verfahren zum Entschlammen einer Flüssigkeit
DE10128062 2001-06-09
PCT/EP2002/005965 WO2002100501A2 (fr) 2001-06-09 2002-05-31 Dispositif de decantation et procede permettant d'eliminer les boues d'un liquide

Publications (1)

Publication Number Publication Date
EP1397310A2 true EP1397310A2 (fr) 2004-03-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02738132A Withdrawn EP1397310A2 (fr) 2001-06-09 2002-05-31 Dispositif de decantation et procede permettant d'eliminer les boues d'un liquide

Country Status (6)

Country Link
US (1) US20040251218A1 (fr)
EP (1) EP1397310A2 (fr)
KR (1) KR20040026141A (fr)
AU (1) AU2002312962A1 (fr)
DE (1) DE10128062A1 (fr)
WO (1) WO2002100501A2 (fr)

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KR20040026141A (ko) 2004-03-27
US20040251218A1 (en) 2004-12-16
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DE10128062A1 (de) 2002-12-12
AU2002312962A1 (en) 2002-12-23

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