EP1322394A2 - Dispositif et procede d'agglomeration de particules - Google Patents

Dispositif et procede d'agglomeration de particules

Info

Publication number
EP1322394A2
EP1322394A2 EP01965254A EP01965254A EP1322394A2 EP 1322394 A2 EP1322394 A2 EP 1322394A2 EP 01965254 A EP01965254 A EP 01965254A EP 01965254 A EP01965254 A EP 01965254A EP 1322394 A2 EP1322394 A2 EP 1322394A2
Authority
EP
European Patent Office
Prior art keywords
particle
fluid
probe
measurement
agglomeration
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Withdrawn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
EP01965254A
Other languages
German (de)
English (en)
Inventor
Ulrich Fischer
Otto Schroers
Benno Wessely
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.)
Stockhausen GmbH and Co KG
Original Assignee
Stockhausen GmbH and Co KG
Chemische Fabrik Stockhausen GmbH
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 Stockhausen GmbH and Co KG, Chemische Fabrik Stockhausen GmbH filed Critical Stockhausen GmbH and Co KG
Publication of EP1322394A2 publication Critical patent/EP1322394A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/532—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke with measurement of scattering and transmission
    • 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
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • 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
    • 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
    • C02F2209/11—Turbidity

Definitions

  • the invention relates to a device for particle agglomeration, a method for controlling the agglomeration of particles and the use of the device and / or the method for the treatment of process water, preferably waste water.
  • a continuous measurement - also called online measurement - is of great importance in the separation of fluid and particle load by means of an agglomeration agent, since an exact dosage and selection of the particle agglomerate agent can take place through the online measurement of the particle load.
  • samples of the fluid were taken and the concentration of the particle load of the fluid and the size of the particles or the particle size distribution of the fluid were determined in the laboratory. In the case of concentration, this was done by drying and weighing a sample.
  • concentration this was done by drying and weighing a sample.
  • the particle sizes or the particle size distribution were determined by sieving or by microscopic examination and by recording and evaluating laser diffraction spectra.
  • EP 0 819 022 discloses a method and an installation for online measurement, in which the density and the volume per time for conditioning and dewatering a suspension are disclosed.
  • the method and system of this disclosure suffer from the fact that the particle size and the particle size distribution resulting therefrom are not taken into account for precise metering and / or selection of the agglomeration agent or the conditioning agent.
  • the object of the invention is generally to overcome the disadvantages known from the prior art and mentioned above.
  • Another object of the invention is to ensure the most accurate possible metering of agglomeration agents.
  • an object of the invention to select an agglomerating agent or a suitable agglomerating agent combination that is as suitable as possible for the agglomeration of a particle load. Furthermore, it is an object of the invention to be able to react as promptly as possible to a particle load fluctuation and / or to changes in the particle properties in a fluid. This applies in particular to particles from fermentation processes, such as sewage sludge from municipal and / or industrial sewage treatment plants, which are compressible particles that cannot be exactly defined.
  • a device comprising a fluid with a supply line carrying the particle load, a probe connected to the supply line, the measurement signal being transmitted by the probe preferably via light scattering, ultrasound, extinction or corriolis force or at least two of these, particularly preferably light scattering is generated and values for a particle size-dominated parameter PT and a concentration-dominated parameter PK of the particle load of the fluid can be determined.
  • a bypass arrangement of the probe in a branched feed line is preferred.
  • the measurement signal is obtained exclusively by measuring the backscattering of the light, that is to say not by means of extinction, i. H. can be determined via a spectral absorption measure or via a decadal absorption capacity.
  • the fluid with a particle load is preferably a fluid that originates from a fermentation process, with processes taking place in digestion towers of sewage treatment plants being particularly preferred as the fermentation process.
  • a particularly preferred fluid with a particle load according to the invention is sewage sludge.
  • the fluid with a particle load originates from papermaking.
  • the pulps produced in connection with paper production should also be mentioned.
  • Fluids that are applied to the wire section of the paper machine during paper production are particularly preferred. These preferably contain paper fibers and fillers in an amount in the range from 0.01 to 10% by weight, based on the fluid.
  • Another embodiment of the invention relates to a fluid that contains residues from food production as particle loads, which are preferably obtained in slaughterhouses or in sugar production.
  • a further embodiment according to the invention relates to a fluid which contains residues from coal extraction, in particular coal washing, as the particle load.
  • Another embodiment of the invention relates to a fluid that is obtained during the bauxite processing in the context of aluminum extraction. Red sludge separation and crystallization of aluminum hydroxide in white operation are preferred here.
  • the fluid preferably contains a particle load in an amount in the range from 0.01 to 40% by weight, preferably from 0.05 to 10% by weight and particularly preferably from 0.1 to 8.0% by weight on the fluid.
  • the measurement signal is preferably voltage modulated. It is particularly preferred that only one measurement signal is required for the two parameters PT and PK.
  • Particle size-dominated parameters are parameters that originate from a change in the measurement signal that is predominantly proportional to the particle size.
  • a concentration-dominated parameter PK is preferably formed from a change in the measurement signal which is predominantly proportional to the concentration.
  • the value for PT can be determined by the standard deviation of the measurement signal and the value for PK by the intensity (height) of the measurement signal.
  • the probe used in the device according to the invention preferably has a light source, an optical system, an aperture and a light signal converter.
  • the light source emits a beam which is preferably in the range of visible light, preferably in the range from 500 to 700 and particularly preferably from 550 to 650 nm. It is further preferred that this beam is monochromatic, as can be obtained in particular by laser.
  • the beam originating from the light source is guided through the optics, which is preferably designed such that the beam has a focal point in the region in which it penetrates the fluid with a particle load.
  • At least part of the light scattered by the particle load is received by a light signal converter and converted into a measurement signal.
  • All light signals which are known to the person skilled in the art and appear to be suitable can be used as light signal converters, photomultipliers and photodiodes being preferred and photodiodes being particularly preferred.
  • the measurement is carried out continuously or at intervals, for example at intervals.
  • the measurement is also carried out directly on the resulting sludge or after dilution of the sludge with a suitable liquid, preferably water or the solid-free, liquid, preferably aqueous sludge phase.
  • a separating device is connected to the probe directly or with the interposition of other device elements. All separation devices known to those skilled in the art for the separation of fluid and particle load can be used as separation devices. Plate filters, in particular chamber and membrane filter presses, sieve belt filters and centrifuges are preferred, centrifuges being particularly preferred.
  • Probes which can be used according to the invention are, for example, “inline particle sensors” of the Aello series, as are offered on the filing date by GWT of TU Dresden mbH at www.aello.de, the Aello 1000 probe being preferred and the Aello 1000 probe being particularly preferred without extinction is.
  • a device in which a metering device for particle agglomeration agents is arranged in front of the probe or between the probe and the separating device or in the separating device or at at least two of the above positions.
  • a metering device is preferably a storage container with a controllable valve.
  • the metering device also has a mixing device with which the (particle) agglomeration agent can be distributed as evenly as possible in the fluid. It is preferred that the metering device, in particular the valve of the metering device, can be controlled via the probe in the device according to the invention.
  • the amount of particle agglomerating agents can be reduced in order to achieve an unchanged agglomeration result.
  • the particle size of the particle load of the fluid increases, in order to obtain the same agglomeration result, it is necessary to also reduce the amount of the particle agglomerating agent.
  • a device according to the invention has at least one further metering device, preferably via the at least one further metering device to the agglomerating agent of the one
  • Dosing device different agglomeration agent is metered. This allows by combining different (particle) agglomerating agents, agglomerating agent mixtures can be adjusted to the particle load to be treated, depending on the desired agglomeration or precipitation result.
  • the agglomerating agent or agents is preferably used in an amount in the range from 0.01 to 15% by weight, preferably from 0.1 to 10% by weight and particularly preferably from 0.5 to 5% by weight, based on the particle load, metered into the fluid.
  • a preferred group of agglomeration agents according to the invention are inorganic coagulants, such as iron salts and / or aluminum salts, such as alum or other polyvalent inorganic coagulants.
  • a polymeric flocculant (auxiliary) can be metered as an agglomerating agent in the device according to the invention via the metering device.
  • the polymeric flocculant (auxiliary) has an intrinsic viscosity in the range from 0.1 to 10 dl / g (measured at 25 ° C. in an IN NaCl solution, buffered at a pH of 7.5 with a “ Suspended Level Viscosimeter ”) and optionally shows a cationic charge of at least 4 meg / g or preferably both.
  • the polymeric flocculant (auxiliary) is dispersible in water, preferably water-soluble.
  • the polymeric flocculants used are predominantly water-soluble and / or at least water-swellable, partially crosslinked polymers, copolymers and terpolymers made from water-soluble, nonionic and / or ionic monomers and comonomers in powder form, as an aqueous solution, as a water-in-water dispersion or used as a water-in-oil dispersion.
  • Such polymers are the homopolymers, copolymers and terpolymers of monoethylenically unsaturated monomers
  • Acid groups which are at least partially in the form of salts, or their esters with di-Ci-C 2 -alkylamino-C 2 -C 6 -alkyl alcohols or their amides with di-Ci-C 2 -alkylamino-C 2 - Cö-alkylamines, which be in protonated or quaternized form as they are are described, for example, in EP-A 113 038 and EP-A 13 416, and optionally further monoethylenically unsaturated monomers.
  • Preferred anionic polyelectrolytes are homo- and / or copolymers of monoethylenic unsaturated carboxylic acids and sulfonic acids, such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, crotonic acid and / or their alkali metal, preferably sodium, potassium or ammonium salts, vinylsulfonic acid, acrylamido and methacrylamidoalkylsulfonic acids , such as 2-acrylamido-2-methylpropanesulfonic acid, 2-sulfoethyl methacrylate and styrene sulfonic acid and / or their alkali metal, preferably sodium or potassium and / or ammonium salts, furthermore vinylphosphonic acid and styrene phosphonic acid and their alkali metal salts, preferably sodium or potassium or ' ammonium salts.
  • monoethylenic unsaturated carboxylic acids and sulfonic acids such as acrylic
  • Cationic flocculants (auxiliary) agents e.g. B. homopolymers and / or copolymers and / or terpolymers of water-soluble, monoethylenically unsaturated vinyl compounds, such as acrylic acid and methacrylic acid esters of dialkylaminoalkyl alcohols in protonated or quaternized form, such as dimethylaminoethyl acrylate, acrylic acid and methacrylic acid amides of dialkylaminoalkylamines, such as quaternized formated, protonated Acrylamidopropyltrimethylammonium chloride and / or Acrylamidopropyltrimethylammonium methyl methosulfate, preferably used with acrylamide.
  • Copolymers which can be used according to the invention are further described in EP-B-228 637 - !
  • the copolymers can be composed of the ionic monomers mentioned and non-ionogenic, water-soluble, monoethylenically unsaturated monomers, such as acrylamide, methacrylamide, N-C ⁇ -C 2 alkylated (meth) acrylamides and with N-vinylamide, vinylformamide, N-vinylacetamide, N-vinyl -N-methylacetamide, N-
  • Suitable water-soluble monomers are also N-methylol acrylamide, N-methylol methacrylamide and those with monovalent Ci bis C 4 alcohols partially or fully etherified N-methylol (meth) acrylamides and diallyldimethylammonium chloride.
  • the copolymers can to a limited extent contain water-insoluble and / or water-insoluble, ethylenically unsaturated monomers, such as (meth) acrylic acid alkyl ester and vinyl acetate, provided the solubility or swellability of the copolymers is retained in water.
  • water-insoluble and / or water-insoluble, ethylenically unsaturated monomers such as (meth) acrylic acid alkyl ester and vinyl acetate
  • the polymers can moreover be prepared using crosslinking, at least double-reactive monomers, preferably double ethylenically unsaturated monomers, so that they are water-swellable or only sparingly soluble, or consist of water-soluble and water-swellable polymers.
  • water-soluble or water-swellable, amphiphilic copolymers formed from cationic and anionic monomers and optionally nonionic monomers can be used.
  • the fluid with the supply line carrying the particle load is connected to a fermentation reactor, for example to a digester.
  • Digestion towers of sewage treatment plants in which the sewage sludge from sewage treatment plants that use wastewater treatment using fermentation processes, are particularly considered as digesters.
  • the invention further relates to a method for controlling the agglomeration of particles in a fluid with a particle load by means of a particle agglomerating agent, the particle load of the fluid being determined by a device according to the invention and thereby dependent on the type and / or amount of the
  • the invention relates to a method for producing a particle agglomerate, particles in a fluid being brought into contact with a particle load with a particle agglomerating agent, the particle load of the fluid, specifically characterized by the solid parameters PK and PT, being determined by a device according to the invention and the like depending on the type and / or amount of the particle agglomerating agent which is metered into the fluid with the particle load.
  • the contacting is preferably carried out by a mixing device, in particular when the separating device is not a centrifuge. In the event that a centrifuge is used as a separating device, it is preferred that the contacting takes place in the centrifuge.
  • the metering in type and amount of the agglomerating agent is determined by a deviation of at least one value PT and at least one value PK of at least one predetermined value PTy and one predetermined value PKv.
  • One possibility for predetermining the PTv and PKv values is to carry out a calibration measurement according to the conventional method, or to determine the correlation of the agglomerate properties with the amount of agglomerating agent used by means of a test run. Another calibration results, for example, from the addition of particles with a known size or size distribution.
  • the process as a whole is optimized, both in terms of the agglomeration of the particle load and in terms of the addition of the (particle) agglomerating agent by type and amount.
  • the particle agglomerate is separated from at least part of the fluid, preferably water or aqueous solution, in the separating device to form a residue.
  • the residue formed it must be more or less free of fluids or water. If the residue is burned in a waste incineration plant, for example, the residue must be as dry as possible. If, on the other hand, the residue is applied to agricultural areas as a soil improver, it is advantageous that the residue can be pumped and sprayed in a suitable manner. In this application, it is preferred that the residue is only partially freed from the fluid or water.
  • Figure 1 shows the schematic structure of a probe of the device according to the invention.
  • FIG. 2 shows a diagram with measurement results when carrying out a method according to the invention.
  • Figure 3 shows a section of a sewage treatment plant with a device according to the invention.
  • the probe 1 shown in FIG. 1 consists of a light source 2, which directs a light beam through the optics 3 into the fluid 4 with the particles 5, this light beam being at least partially scattered by the particles 5 and thrown onto the light signal converter 6.
  • the light signal converters 6 convert the light incident on them into a signal which is processed in a computer unit to form a signal, of which standard deviation and intensity (height) can be determined.
  • FIG. 2 shows a diagram in which the standard deviation of the signal measured with probe 1 is plotted on one axis and the intensity (height) of the measurement signal is plotted as voltage on the other axis.
  • the signals are picked up by probe 1 in
  • Time intervals determined, for example, in comparison to the speed with the the fluid flowing through the jet is small.
  • the signal sets obtained in this way form the clusters identified by a multiplicity of measurement points on the diagram according to FIG. 2.
  • These clusters are outlined with cluster boundaries (oval circles).
  • the cluster marked by the large oval circle shows the measured values caused by flocculated particles of sewage sludge from a municipal sewage treatment plant.
  • the small oval circle frames the cluster, which stems from the flocculated particles of sewage sludge from a municipal sewage treatment plant.
  • FIG. 3 shows a digester tower 7, to which a feed line 8 connects, in which the probe 1 is attached before the feed of the metering device 9 and which leads to the separating device 10.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Treatment Of Sludge (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

L'invention concerne un dispositif d'agglomération de particules, présentant une ligne d'alimentation de fluide avec une charge de particules, et une sonde connectée à ladite ligne d'alimentation, caractérisé en ce que des données relatives à un paramètre PT ayant trait principalement à la granulométrie, et à un paramètre PK ayant trait principalement à la concentration de la charge en particules dans le fluide peuvent être déterminées par l'intermédiaire de la sonde, via un signal de mesure. L'invention concerne en outre un procédé de contrôle de l'agglomération de particules, ainsi que l'utilisation du dispositif ou du procédé pour le traitement d'eaux usées.
EP01965254A 2000-09-06 2001-09-05 Dispositif et procede d'agglomeration de particules Withdrawn EP1322394A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10044156A DE10044156A1 (de) 2000-09-06 2000-09-06 Verfahren und Vorrichtung zur Teilchenagglomeration
DE10044156 2000-09-06
PCT/EP2001/010230 WO2002020116A2 (fr) 2000-09-06 2001-09-05 Dispositif et procede d'agglomeration de particules

Publications (1)

Publication Number Publication Date
EP1322394A2 true EP1322394A2 (fr) 2003-07-02

Family

ID=7655342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01965254A Withdrawn EP1322394A2 (fr) 2000-09-06 2001-09-05 Dispositif et procede d'agglomeration de particules

Country Status (5)

Country Link
US (1) US20040090625A1 (fr)
EP (1) EP1322394A2 (fr)
AU (1) AU2001285928A1 (fr)
DE (1) DE10044156A1 (fr)
WO (1) WO2002020116A2 (fr)

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DE10041395A1 (de) 2000-08-23 2002-03-07 Stockhausen Chem Fab Gmbh Polymerdispersionen zur Feuerverhütung und -bekämpfung mit verbesserter Umweltverträglichkeit
DE10041394A1 (de) * 2000-08-23 2002-03-07 Stockhausen Chem Fab Gmbh Verwendung von Wasser-in-Wasser-Polymerdispersionen zur Feuerverhütung und -bekämpfung
DE10118020A1 (de) 2001-04-10 2002-10-17 Stockhausen Chem Fab Gmbh Löschwasser-Additive
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Also Published As

Publication number Publication date
WO2002020116A3 (fr) 2002-12-12
AU2001285928A1 (en) 2002-03-22
US20040090625A1 (en) 2004-05-13
DE10044156A1 (de) 2002-04-04
WO2002020116A2 (fr) 2002-03-14

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