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WO2007006480A1 - Procede de traitement de boues de curage par degazage sous depression - Google Patents

Procede de traitement de boues de curage par degazage sous depression Download PDF

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Publication number
WO2007006480A1
WO2007006480A1 PCT/EP2006/006593 EP2006006593W WO2007006480A1 WO 2007006480 A1 WO2007006480 A1 WO 2007006480A1 EP 2006006593 W EP2006006593 W EP 2006006593W WO 2007006480 A1 WO2007006480 A1 WO 2007006480A1
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WO
WIPO (PCT)
Prior art keywords
digester
sludge
gas
degassing
pump
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
PCT/EP2006/006593
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German (de)
English (en)
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2007006480A1 publication Critical patent/WO2007006480A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • 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
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M23/00—Constructional details, e.g. recesses, hinges
    • C12M23/36—Means for collection or storage of gas; Gas holders
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
    • C12M29/18—External loop; Means for reintroduction of fermented biomass or liquid percolate
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
    • C12M29/20—Degassing; Venting; Bubble traps
    • 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
    • C02F2303/26—Reducing the size of particles, liquid droplets or bubbles, e.g. by crushing, grinding, spraying, creation of microbubbles or nanobubbles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

  • the invention relates to a method for the treatment of sewage sludge, in which digested sludge and biogas is produced by rotting of raw sludge in a digester.
  • Sewage sludge from municipal sewage treatment plants is organically decomposed by the action of bacteria in the digester, producing digester gas whose energy content can be used. In the best case, not only the energy needs of the sewage treatment plant can be covered. If the energy balance is positive, even some of the digester gas could be released and fed into the grid. In order to achieve a positive energy balance, however, additional measures to improve the degree of organic degradation are required and have already been proposed several times. However, while the energy balance is improved, it still remains negative, because the treatment of sewage sludge consumes more electricity than can be generated by the additional gas production. Therefore, such processes are not economically viable.
  • the invention solves this problem in that a part of the digested sludge from the digester, preferably out of the sump of the digester, led out, degassed in a degassing under low pressure and returned to the digester.
  • degassing under low pressure not only additional digester gas is obtained, but also increases the effectiveness of the digestion process in the digester, so that there additional Faulgasmengen arise.
  • Tests have shown that sludge samples subjected to intense degassing before being treated with a high-pressure homogenizer at 50 to 400 bar had a one-third increase in specific gas production with the same energy input.
  • the digestion process is hampered by the generation of microbubbles from biogas, which bind to sludge agglomerates.
  • the degassing device according to the invention brings these microbubbles together, so that a coherent gas volume is formed, which can be easily separated from the digested sludge.
  • the energy yield can be further improved if the sludge discharged from the digester is homogenized by a low-pressure homogenizer before it is returned to the digester.
  • a high-pressure homogenizer the digested sludge consisting of a sludge / gas mixture must be compressed to high pressure.
  • isothermal compression work is spent on the gas contained in the digested sludge.
  • This expended energy for the compression work for example, at a pressure increase of 150 bar about 15% of the total energy input to reach.
  • the energy used for the compaction is not available for the homogenization of the digested sludge and is therefore lost.
  • the effectiveness of the high-pressure homogenizer is reduced because a two-digit% rate of the flowing sludge / gas mixture consists of gas and therefore for a given volume flow rate per unit time a corresponding two-digit percentage less available for the treatment of digested sludge. In the treatment of the digested sludge by a low-pressure homogenizer, therefore, the energy balance can be improved.
  • the degassing device comprises a crusher for the separation of solid contaminants, which has a rotating knife, a perforated plate arranged above and a calming zone in which a contiguous Faulgasvolumen deposited from the digested sludge accumulates, which can be removed via a gas outlet valve ,
  • the microbubbles are separated by the rotating knife of solid impurities in sewage sludge and combined to larger gas collections.
  • the perforated plate arranged above retains larger sludge particles until they are comminuted and allows only the already appropriately treated sludge to enter the settling zone, where the digester gas separates from the sludge and can be removed upwards through the gas outlet valve.
  • the gas outlet valve By the gas outlet valve, a minimum pressure is maintained in the interior of the degassing, so that the dissolved gas remain in solution and can not form new microbubbles.
  • the degassing a feed pump preferably as Rotary pump or eccentric screw pump is designed with an upper pump inlet and with a lower pump outlet, and a return line connecting the pump output with the pump inlet comprising a gas outlet valve, wherein the segregating in the return line sewer gas can be removed via the gas outlet valve.
  • the digested sludge is not only promoted, but also degassed.
  • the rising digester gas escapes upwards and collects in the upwardly leading return line, where it is held under pressure by the gas outlet valve and removed as needed.
  • the degree of degassing can be further increased by the measure that the degassing device has a substantially horizontally arranged pipe extension with a gas outlet valve, wherein the segregating in an upper calming zone of the pipe extension digester gas via the gas outlet valve can be removed.
  • the flow rate of the digested sludge is reduced so that it lingers relatively long in the area of the pipe extension. Due to the longer residence time it comes here increasingly to the elimination of digester gas, which in turn can be kept under pressure via the gas outlet valve and removed if necessary.
  • the inventive method works particularly effective when the digested sludge in the degassing successively a first stage with a crusher and perforated plate, a second stage with a feed pump and return line, and a third stage with
  • Fig. 1 a schematic representation of the method according to the invention.
  • the resulting digester gas will first dissolve in the liquid of the digested sludge until a solution equilibrium is exceeded. In supersaturation gas bubbles form, which increase over time, which increases their buoyancy. After overcoming local adhesive forces or other obstacles, the gas bubbles migrate to the surface of the sludge and enter a gas space which forms above the sludge surface in the digester 1.
  • the digester gas consists of 55% to 70% CH 4 , 29% to 44% CO 2 and 1% trace elements.
  • Typical digesters have a volume of 1000 m 3 to 8000 m 3 and a height of 10 m to 20 m.
  • the digested sludge is circulated in the digester 1 to promote the digestion process and for better mixing, which is indicated in the Fig. 1 by the Rezirkulationsweg 4.
  • the digested sludge 5 is pumped out of the digester 1 and fed to a further use.
  • a part of the digested sludge 6 is taken from the sump of the digester 1, treated and finally fed back to increase the yield of digester gas.
  • the bottom of the digester 1 is the
  • the degassing device comprises a Crusher 7, on the one hand has an unillustrated rotating knife and a perforated plate 8 arranged above. Above the perforated plate 8 is a calming zone 9. By the movements of the knife in the crusher 7 microbubbles of agglomerates are dissolved in the digested sludge 6 and crushed the agglomerates. This is a commercial crusher for the separation of solid impurities.
  • the perforated plate 8 has holes with a diameter of 2 mm to 6 mm, preferably 4 mm.
  • the rotating blade and the special perforated plate 8 separate the sludge from adhering gas bubbles, which unite in the calming zone 9 to a continuous gas volume. For this gas volume sewer gas 10 can be removed via a gas outlet valve 11.
  • the digested sludge 12 continues to flow to a second stage of the degassing device.
  • This consists of a feed pump 13, which is designed as a rotary piston pump or eccentric screw and has an upper pump inlet 14 and a lower pump outlet 15.
  • the pump outlet 15 is connected to the pump inlet 14 via a return line 16.
  • the return line 16 again forms a calming zone, in which gas bubbles combine to form a coherent gas volume, after the piston or the screw conveyor of the feed pump 13 has contributed to a release of the adhering gas bubbles.
  • the return line 16 is connected to a gas outlet valve 17.
  • the now more degassed digested sludge 18 passes from the pump outlet 15 of the feed pump 13 to a third stage of the degassing.
  • This consists of a pipe extension 19, which from the digested sludge substantially in the horizontal direction is flowed through. Due to the larger cross section of the pipe extension reduces the flow rate and thus the residence time of the sludge in the pipe extension 19. This gives the gas bubbles contained in the sludge opportunity to ascend and collect in a located in the upper part of the pipe extension 19 calming zone 20.
  • the tube extension is connected at its top with a gas outlet valve 21, through which the collected digester gas can be removed.
  • Pipe extension 19 in the low pressure homogenizer 23 This is a known from the food industry homogenizer, which consists of one or more homogenizer valves through which the mass to be homogenized is pressed. In the homogenizer valves, the mass must flow through a narrow annular gap, whereby larger components are comminuted. This leads to a homogenization of the digested sludge. Due to the homogenization, the inner surface of the contained mud particles increases, on which the digestive bacteria attack. The degassed and homogenized digested sludge 24 is now returned to the digester 1.
  • the digested bacteria come into better contact with the sludge particles to be decomposed, whereby the digestion process is much more effective than with untreated sludge.
  • the digester gas released in the degassing is taken from the gas outlet valves 11, 17, 21 and added to the digester gas contained in the digester 1. For this are the gas outlet valves 11, 17, 21 automatically controlled.
  • the return of the digester gas into the digester 1 takes place during a rinsing phase of the homogenizer 23.
  • the digester gas is fed into the return line to the digester 1.
  • the inventive method with respect to the electrical energy balance is not only self-sufficient, but produces an electrical energy surplus of 30% based on the electrical used

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Zoology (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Wood Science & Technology (AREA)
  • Genetics & Genomics (AREA)
  • General Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biotechnology (AREA)
  • Biomedical Technology (AREA)
  • Sustainable Development (AREA)
  • Molecular Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Sludge (AREA)

Abstract

L'invention concerne un procédé permettant de traiter des boues de curage, selon lequel des boues de putréfaction (5) et du gaz de curage (3) sont produits par putréfaction de boues non traitées (2) dans une cuve de digestion (1). L'invention vise à améliorer ledit procédé, pour obtenir un rendement optimal du gaz de curage. A cet effet, une partie des boues de putréfaction (6) est guidée hors de la cuve de digestion (1), de préférence hors du fond de la cuve de digestion (1), puis est dégazée dans un dispositif de dégazage (7, 8, 13, 16, 19), sous dépression et est renvoyée dans la cuve de digestion (1).
PCT/EP2006/006593 2005-07-14 2006-07-06 Procede de traitement de boues de curage par degazage sous depression Ceased WO2007006480A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005032854.7 2005-07-14
DE102005032854A DE102005032854A1 (de) 2005-07-14 2005-07-14 Verfahren zur Behandlung von Klärschlamm

Publications (1)

Publication Number Publication Date
WO2007006480A1 true WO2007006480A1 (fr) 2007-01-18

Family

ID=37205721

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/006593 Ceased WO2007006480A1 (fr) 2005-07-14 2006-07-06 Procede de traitement de boues de curage par degazage sous depression

Country Status (2)

Country Link
DE (1) DE102005032854A1 (fr)
WO (1) WO2007006480A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009211566A (ja) * 2008-03-05 2009-09-17 Ntt Communications Kk 認証システム、情報機器、認証方法、及びプログラム
EP2463240A1 (fr) * 2010-12-07 2012-06-13 Veolia Water Solutions & Technologies Support Installation et procédé de récupération de méthane d'un effluent liquide

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015203484B4 (de) * 2015-02-26 2017-05-18 Andreas Dünnebeil Verfahren zur Schlammbehandlung und Schlammbehandlungsanlage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981800A (en) * 1974-11-22 1976-09-21 Era, Incorporated High quality methane gas through modified anaerobic digestion
US5641401A (en) * 1993-04-29 1997-06-24 The Dow Chemical Company Sludge deodorization
FR2786763A1 (fr) * 1998-12-04 2000-06-09 Omnium Traitement Valorisa Procede et installation de traitement des boues provenant des installations d'epuration biologique des eaux
EP1473279A1 (fr) * 2003-04-30 2004-11-03 Ziegelei Gasser GmbH-Srl Appareil et procédé pour la digestion anaérobie de biomasse et la production de biogaz
WO2005016829A1 (fr) * 2003-08-19 2005-02-24 Ultra Technology Europe Ab Procede de traitement d'un milieu au moyen de transducteurs ultrasonores
EP1522529A1 (fr) * 2003-10-07 2005-04-13 Hans Jörg Dr. Lafontaine Dispositif pour traiter des déchets liquides

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DE2924465C2 (de) * 1979-06-18 1982-03-25 Wolf-Dietrich 2055 Wohltorf Grosse Verfahren und Vorrichtung zur anaeroben Behandlung von Abwasser
DE3221508A1 (de) * 1982-06-07 1983-12-08 Klöckner Kommunal- und Industriebau GmbH, 4500 Osnabrück Faulturm
DE3714591C2 (de) * 1986-05-02 1995-04-20 Limus Umwelttechnik Gmbh Verfahren und Vorrichtung zur Behandlung von ausgefaultem Klärschlamm
US5451319A (en) * 1988-03-30 1995-09-19 Kobayashi; Yoshio Anaerobic digestion process for sewage sludge
JP2997833B2 (ja) * 1993-12-28 2000-01-11 日立造船株式会社 下水汚泥の嫌気性消化方法
DE19518191C2 (de) * 1995-05-22 1998-07-16 Schulze Oswald Kg Verfahren und Entgasungsbehälter zum Entgasen von Faulschlamm
DE19800224C1 (de) * 1998-01-07 1999-05-06 Emschergenossenschaft Lippever Vergärung von Klärschlamm und Bioabfällen
DE19842005C2 (de) * 1998-09-04 2000-09-28 Fraunhofer Ges Forschung Verfahren und Vorrichtung zur Behandlung von biologischen Abfällen
DE19940994B4 (de) * 1999-08-28 2004-02-26 Clausthaler Umwelttechnikinstitut Gmbh, (Cutec-Institut) Verfahren zum Abbau von Klärschlamm

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981800A (en) * 1974-11-22 1976-09-21 Era, Incorporated High quality methane gas through modified anaerobic digestion
US5641401A (en) * 1993-04-29 1997-06-24 The Dow Chemical Company Sludge deodorization
FR2786763A1 (fr) * 1998-12-04 2000-06-09 Omnium Traitement Valorisa Procede et installation de traitement des boues provenant des installations d'epuration biologique des eaux
EP1473279A1 (fr) * 2003-04-30 2004-11-03 Ziegelei Gasser GmbH-Srl Appareil et procédé pour la digestion anaérobie de biomasse et la production de biogaz
WO2005016829A1 (fr) * 2003-08-19 2005-02-24 Ultra Technology Europe Ab Procede de traitement d'un milieu au moyen de transducteurs ultrasonores
EP1522529A1 (fr) * 2003-10-07 2005-04-13 Hans Jörg Dr. Lafontaine Dispositif pour traiter des déchets liquides

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009211566A (ja) * 2008-03-05 2009-09-17 Ntt Communications Kk 認証システム、情報機器、認証方法、及びプログラム
EP2463240A1 (fr) * 2010-12-07 2012-06-13 Veolia Water Solutions & Technologies Support Installation et procédé de récupération de méthane d'un effluent liquide
WO2012078044A1 (fr) * 2010-12-07 2012-06-14 Veolia Water Solutions & Technologies Support Procédé et installation de récupération et d'utilisation du méthane à partir d'un effluent liquide anaérobie

Also Published As

Publication number Publication date
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