EP2197802A1 - Procédé et dispositif pour améliorer la désintégration de suspensions thixotropes grâce aux ultrasons - Google Patents

Procédé et dispositif pour améliorer la désintégration de suspensions thixotropes grâce aux ultrasons

Info

Publication number
EP2197802A1
EP2197802A1 EP08838241A EP08838241A EP2197802A1 EP 2197802 A1 EP2197802 A1 EP 2197802A1 EP 08838241 A EP08838241 A EP 08838241A EP 08838241 A EP08838241 A EP 08838241A EP 2197802 A1 EP2197802 A1 EP 2197802A1
Authority
EP
European Patent Office
Prior art keywords
suspension
flow
ultrasound
flow rate
ultrasonic
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.)
Ceased
Application number
EP08838241A
Other languages
German (de)
English (en)
Inventor
Hannelore Friedrich
Eberhard Friedrich
Burkhardt Fassauer
Alexander Michaelis
Karin Jobst
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP2197802A1 publication Critical patent/EP2197802A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/10—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing sonic or ultrasonic vibrations
    • 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
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • 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
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
    • 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
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis

Definitions

  • the invention relates to the field of process engineering and relates to a method and a device for improving the disintegration of thixotropic suspensions by means of ultrasound, as they can be used, for example, for the disintegration of excess sludge or excess sludge-containing sewage sludge.
  • sewage sludge as well as other thixotropic suspensions, by its nature has specific disadvantages, such as the presence of pulps and the consequent tendency to clog ultrasound treatment reactors with small flow cross-sections.
  • this disadvantage is taken into account by a specific reactor design and counteracted by the formation of a large flow cross-section in the ultrasonic reactor.
  • a further reduction of the disintegrating effect occurs with a concentration of the sludge, ie with increasing solids content.
  • the object of the present invention is to provide a method for improving the disintegration of thixotropic suspensions by means of ultrasound, in which the dynamic viscosity of the thixotropic suspensions is lowered before and / or during the ultrasound treatment, and a simple and cost-effective device for implementing the method.
  • thixotropic suspensions of a subjected to mechanical stress these so treated suspensions of an ultrasound treatment, wherein the suspension stream before ultrasound treatment, at least one further suspension stream is added, which is branched off from the total suspension stream after the ultrasonic treatment as a partial flow and its flow rate is increased before entering the suspension stream before the ultrasonic treatment.
  • sewage sludges having a solids content of ⁇ 12% dry residue are used as thixotropic suspensions.
  • excess sludge or excess sludge-containing sewage sludge are used as sewage sludge.
  • ultrasound is used with an amplitude of ⁇ 5 microns.
  • the mechanical stress is applied in the form of a shear and / or cutting stress, even more advantageously if the shear and / or cutting stress is applied by a device consisting of rotors and stators, wherein advantageously the rotors with a peripheral speed in the range of 23-35 m / s are used.
  • a partial stream is branched off from the total suspension stream after the ultrasonic treatment and fed to the suspension stream before the ultrasonic treatment at different but higher flow rates than the suspension stream after the mechanical loading. It is furthermore advantageous if several partial streams are branched off from the total suspension flow after the ultrasound treatment and at least one of them is supplied to the suspension flow before the hydrodynamic load.
  • the device according to the invention for the realization of the method consists of a piping system, wherein a device part for applying a mechanical load on the suspension flow is installed in a continuous pipe through which the entire suspension flow must pass, are subsequently positioned in and around the tubing ultrasonic transducer and before and after the ultrasound generator area there are openings in the pipeline which are connected to a further pipeline, and the further pipeline realizes a connection of at least one of the openings in the area after the ultrasound transmitters to at least one of the openings in front of the area with the ultrasound transmitters and within this further pipeline, at least one device for increasing the flow rate of the suspension passing through the further pipeline is arranged.
  • the continuous pipe has a nominal diameter of 40 to 100 mm.
  • the further pipeline has a nominal diameter of 40 to 100 mm.
  • the device part for applying a mechanical stress by shearing of one or more rotors and one or more stators wherein still advantageously the device part consists of 3 rotors and 3 stators and wherein further advantageously the rotors with a peripheral speed of at least 23 m / s rotate. It is also advantageous if the device for increasing the flow rate is a pump with a throughput of 4 to 12 m 3 / h.
  • the ultrasound transmitters have a vibration amplitude ⁇ 5 ⁇ m.
  • the inventive solution significantly improves the effectiveness of the ultrasound treatment of thixotropic suspensions as an independent disintegration step.
  • the thixotropic suspensions are known to be characterized by non-Newtonian flow behavior. This means that their viscosity depends on the strength of the mechanical stress of the suspension. Furthermore, their viscosity is increased disproportionately when the solids concentration is increased. At the same time, the fluidity is reduced and the coupling of ultrasound is made considerably more difficult.
  • the viscosity of the thixotropic suspensions is significantly reduced by targeted acceleration of the suspension before and during ultrasound treatment, whereby the coupling of the ultrasound is significantly facilitated and the disintegrating effect is markedly improved.
  • the accelerated passage of the suspension counteracts the tendency to blockage.
  • the method according to the invention and the device according to the invention thus equally meet the requirements of achieving, on the one hand, a maximum of the disintegrating effect of the ultrasound-inducing cavitation to be achieved and, on the other hand, ensuring the highest possible reliability of the ultrasonic system in continuous operation.
  • Particularly advantageous effects are achieved by the method according to the invention and the device according to the invention if the solids content of the thixotropic suspensions does not exceed a value of 12% TR.
  • a further advantage of the solution according to the invention is that ultrasound transmitters with significantly lower oscillation amplitudes can be used in order to achieve an at least comparable or better result, as with the solutions according to the prior art.
  • the thixotropic suspension is irreversibly changed in a first method step by means of mechanical loading.
  • the change is the shearing or fragmentation of the solid components of the thixotropic suspensions, resulting in permanent homogenization and lowering of the dynamic viscosity of the suspensions.
  • the viscosity of the suspensions remains at this lower level after this first treatment step.
  • the suspension stream is then forwarded to an ultrasonic treatment after this first viscosity-reducing treatment step.
  • the throughput of this stream is between 0.5 and 3 m 3 / h.
  • the throughput increases to values of 4.5 to 15 m 3 / h.
  • the flow rate increases from 0.05 ... 0.1 m / s to 0.7 ... 1, 9 m / s.
  • the introduction of the partial stream is the second viscosity-reducing treatment step, which changes the viscosity of the suspension partially reversible.
  • the significantly accelerated total current is then subjected to the ultrasound treatment and can absorb the ultrasonic effect much better.
  • the subsequent suspension stream shows a significantly increased disintegration of the solid components.
  • the speed of the suspension flow decreases again, causing the viscosity to increase again somewhat.
  • the disintegrating effect remains unaffected.
  • a portion of this suspension stream with a lower flow rate is diverted and passed, for example via a pump, which accelerates the suspension flow again. This accelerated suspension stream is then returned to the suspension stream prior to sonication.
  • the viscosity of the suspension is only temporarily reduced during the ultrasound treatment and reversibly.
  • a partial stream of thickened excess sludge with a solids content of 5.8% is disintegrated prior to digestion.
  • the throughput through the ultrasonic system is 1, 2 m 3 / h.
  • the sludge has a viscosity of 17,950 mPa-s.
  • the ultrasonic disintegration achieves the following primary disintegration effects:
  • the viscosity of the slurry is reduced from 0.6 m / s to 2500 nnPa-s due to the increase in the flow rate in the ultrasonic device.
  • This is achieved by branching off a partial suspension amount of 6 m7h after the ultrasonic treatment, the flow rate of which is increased to 0.5 m / s by a circulating pump, which upstream of the ultrasonic system, which has a flow rate of 0.1 m / s is added, and thus a total flow rate of 0.6 m / s is achieved.
  • the increase in the flow rate of the total sludge flow leads to a momentary reduction in viscosity.
  • the cavitation effect of the ultrasound is increased in such a way that a further increase in enzyme mobility is achieved.
  • enzyme mobility is increased 40-fold.
  • the sludge particles are further crushed slightly (increasing the particle surface to 0.32 m 2 / cm 3 ).
  • the non-recirculated sludge subset is led to digestion.
  • the viscosity of the sludge is 12,800 mPa-s. Compared with the initial viscosity of the untreated sludge, the disintegration of the sludge reduces the viscosity by approximately 30%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Sludge (AREA)

Abstract

La présente invention concerne le domaine de la technique des procédés et concerne un procédé et un dispositif comme ceux qui peuvent être par exemple employés pour la désintégration de boues résiduaires. Le but de la présente invention est de proposer un procédé au cours duquel on abaisse la viscosité dynamique des suspensions thixotropes avant et/ou pendant le traitement par ultrasons. Ce but est atteint grâce à un procédé au cours duquel les suspensions thixotropes sont soumises à une charge mécanique et ensuite à un traitement par ultrasons. Avant le traitement par ultrasons, on ajoute à l'écoulement de suspension au moins un autre écoulement de suspension ayant un débit plus rapide. Le but de l'invention est en outre atteint grâce à un dispositif constitué d'un système de conduite comprenant une partie de dispositif destinée à appliquer une charge mécanique après un générateur d'ultrasons. Avant et après la zone des générateurs d'ultrasons, on trouve des ouvertures dans la conduite qui sont reliées à une autre conduite.
EP08838241A 2007-10-05 2008-09-30 Procédé et dispositif pour améliorer la désintégration de suspensions thixotropes grâce aux ultrasons Ceased EP2197802A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007000824A DE102007000824A1 (de) 2007-10-05 2007-10-05 Verfahren und Vorrichtung zur Verbesserung der Desintegration von thixotropen Suspensionen mittels Ultraschall
PCT/EP2008/063073 WO2009047165A1 (fr) 2007-10-05 2008-09-30 Procédé et dispositif pour améliorer la désintégration de suspensions thixotropes grâce aux ultrasons

Publications (1)

Publication Number Publication Date
EP2197802A1 true EP2197802A1 (fr) 2010-06-23

Family

ID=40134812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08838241A Ceased EP2197802A1 (fr) 2007-10-05 2008-09-30 Procédé et dispositif pour améliorer la désintégration de suspensions thixotropes grâce aux ultrasons

Country Status (6)

Country Link
US (1) US20100288709A1 (fr)
EP (1) EP2197802A1 (fr)
CN (1) CN101821208A (fr)
CA (1) CA2712108A1 (fr)
DE (1) DE102007000824A1 (fr)
WO (1) WO2009047165A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013206492B4 (de) 2013-04-11 2021-11-04 ULTRAWAVES - Wasser- und Umwelttechnologien GmbH Ultraschallbehandlungsvorrichtung für Biogasanlagen

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH355770A (de) * 1957-04-30 1961-07-31 Forsch Inst Professor Ing Chem Verfahren und Apparatur zur kontinuierlichen oder chargenweisen Behandlung von Stoffen und Stoffgemischen
US4369100A (en) * 1977-09-27 1983-01-18 Sawyer Harold T Method for enhancing chemical reactions
DE4205739A1 (de) 1992-02-25 1993-08-26 Gerhard Dipl Ing Osswald Verfahren zur zerstoerung zellulaerer strukturen von suspensionen von mikroorganismen durch ultraschall, insbesondere von schlaemmen aus biologischen klaeranlagen
DE19517381C1 (de) 1995-05-11 1996-11-07 Tesser Kurt Dipl Ing Fh Einrichtung zum Zerstören zellulärer Strukturen in Schlämmen biologischer Kläranlagen
ATE227248T1 (de) * 1996-05-23 2002-11-15 Telsonic Ag Verfahren und vorrichtung zur kontinuierlichen desintegration von belebtem schlamm
DE10040545B4 (de) * 2000-08-18 2020-08-27 Ecolab USA Inc. (n.d.Ges.d.Staates Delaware) Verfahren zur mechanischen Desintegration von biogenem Klärschlamm
GB0106483D0 (en) * 2001-03-16 2001-05-02 Ws Atkins Consultants Ltd Improvemnts relating to fluid processing devices
AT410940B (de) 2002-04-16 2003-08-25 Kubinger Ulrich Ing Vorrichtung zur desintegration von klärschlamm
JP2004148137A (ja) * 2002-10-28 2004-05-27 Hitachi Ltd 汚泥可溶化装置
JP3735648B2 (ja) * 2003-03-14 2006-01-18 富士通株式会社 半導体製造における研磨廃液再利用方法
US7163629B2 (en) * 2003-07-28 2007-01-16 Virginia Tech Intellectual Properties, Inc. System and method for enhanced wastewater treatment
FR2864069B1 (fr) * 2003-12-17 2006-05-05 Air Liquide Procede de reduction de boues issues du traitement d'eaux usees par oxygenation et action mecanique
DE102007007721A1 (de) * 2007-02-16 2008-08-21 BIONIK GmbH - Innovative Technik für die Umwelt Verfahren und Vorrichtung zur Behandlung von Klärschlamm, Abwasser oder einer Suspension partikulärer Substanzen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009047165A1 *

Also Published As

Publication number Publication date
DE102007000824A1 (de) 2009-04-09
CA2712108A1 (fr) 2009-04-16
CN101821208A (zh) 2010-09-01
WO2009047165A1 (fr) 2009-04-16
US20100288709A1 (en) 2010-11-18

Similar Documents

Publication Publication Date Title
EP1440942B1 (fr) Dispositif de traitement de substrats organiques, de boues résiduaires et d'eaux usées
DE69931943T2 (de) Vorrichtung für koagulationsreaktionen
DE60011252T2 (de) Förderung scherverdünnter aufschlämmungen
WO2009065509A1 (fr) Procédé et dispositif pour le traitement de boues
DE102019120939B4 (de) Verfahren zum Bereitstellen einer Zementsuspension durch einen Zementvormischer und ein Verfahren zum Mischen von Beton oder Mörtel
DE10107448A1 (de) Verfahren und Vorrichtung zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit einem Füllstoff
EP1771385B1 (fr) Homogeneisation hydrodynamique
EP2769764A1 (fr) Réacteur à ultrasons à débit traversant, installation de traitement par ultrasons et procédé de traitement de substrats
WO2003082753A1 (fr) Procede et dispositif pour detruire des structures cellulaires presentes dans des eaux usees et des boues de stations d'epuration biologiques
DE10343602A1 (de) Vorrichtung und Verfahren zur Behandlung eines Mediums wie Abwasser, Klärschlamm oder dergleichen
EP2197802A1 (fr) Procédé et dispositif pour améliorer la désintégration de suspensions thixotropes grâce aux ultrasons
WO2003086989A1 (fr) Dispositif de desintegration de boues residuaires
WO2017129419A1 (fr) Dispositif et procédé de floculation de particules solides d'un mélange solide-liquide
DE102018116196A1 (de) Verfahren und Anordnung zur Fest-Flüssig-Trennung von Suspensionen, insbesondere von Klärschlamm unter Zugabe von Flockungsmitteln
WO2004101123A1 (fr) Dispositif et procede d'introduction d'un milieu gazeux et/ou liquide dans un milieu liquide
EP1432502B1 (fr) Dispositif de floculation et procede de conditionnement de suspensions colloidales
DE102020004653B4 (de) Verfahren und Vorrichtung zur Aufbereitung einer thixotropen Bentonit-Bodensuspension
DE102007007721A1 (de) Verfahren und Vorrichtung zur Behandlung von Klärschlamm, Abwasser oder einer Suspension partikulärer Substanzen
DE102017124791B4 (de) Verfahren und Vorrichtung zum Einmischen einer Substanz in ein strömendes Fluid
DE102007012086A1 (de) Verfahren zur Behandlung von Überschussschlamm in einer Kläranlage
DE102010052191A1 (de) Druckentspannungsflotation
DE102016006120B4 (de) Mischvorrichtung
DE102004057115A1 (de) Mehrstufige-Hydrodynamische-Homogenisation
EP2960323A1 (fr) Dispositif et procédé de fusion de substrats biologiques
WO2024068650A2 (fr) Procédé d'électrolyse hydrodynamique

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20100503

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20111117

REG Reference to a national code

Ref country code: DE

Ref legal event code: R003

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20120506