EP0000293B1 - Apparatus and method for anaerobic digestion of biodegradable waste material - Google Patents

Apparatus and method for anaerobic digestion of biodegradable waste material Download PDF

Info

Publication number
EP0000293B1
EP0000293B1 EP78300116A EP78300116A EP0000293B1 EP 0000293 B1 EP0000293 B1 EP 0000293B1 EP 78300116 A EP78300116 A EP 78300116A EP 78300116 A EP78300116 A EP 78300116A EP 0000293 B1 EP0000293 B1 EP 0000293B1
Authority
EP
European Patent Office
Prior art keywords
gas
tank
arm
mixing assembly
holding member
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.)
Expired
Application number
EP78300116A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0000293A1 (en
Inventor
George Maxwell Rippon
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.)
Biomechanics Ltd
Original Assignee
Biomechanics Ltd
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 Biomechanics Ltd filed Critical Biomechanics Ltd
Publication of EP0000293A1 publication Critical patent/EP0000293A1/en
Application granted granted Critical
Publication of EP0000293B1 publication Critical patent/EP0000293B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1284—Mixing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/15—Stirrers with tubes for guiding the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
    • B01F23/23311—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements through a hollow stirrer axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2331—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
    • B01F23/23314—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements through a hollow stirrer element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/2366—Parts; Accessories
    • B01F23/2368—Mixing receptacles, e.g. tanks, vessels or reactors, being completely closed, e.g. hermetically closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
    • B01F23/454—Mixing liquids with liquids; Emulsifying using flow mixing by injecting a mixture of liquid and gas
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/13—Openwork frame or cage stirrers not provided for in other groups of this subclass
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

Definitions

  • This invention relates to apparatus for anaerobic digestion of biodegradable waste material.
  • the concentration of the solids material which should be maintained in suspension in the tank during anaerobic digestion is often such, especially during start-up of the process, that the solids material tends to settle fast to the floor of the tank where it can compact and require a large force to disturb it and move it back into suspension in the tank. Because of this much more energy is required to maintain in suspension a low concentration of solids than is required with a high concentration of solids which behaves more like a homogeneous liquid and can be kept mixed by using relatively inexpensive gas lift pumps which use relatively little power.
  • An alternative method of preventing settling and compaction of the solids material as a sludge on the bottom of the tank is to use a rotating scraper arm.
  • Such scraper arms are usually driven by a central torque tube from outside the tank roof by a reduction gear drive system.
  • the central drive systems for the scraper arm involve very large torques and are consequently very expensive.
  • the difficulty of mixing the anaerobic bacteria in the waste material in the digestion tank is one of the important factors currently limiting the diameter of the digestion tanks which, for this reason, are built higher and frequently involve very costly foundations.
  • settling and compaction of sludge on the bottom of the anaerobic digestion tank is substantially prevented by rotating an arm from which gas is emitted at a plurality of positions along the length of the arm.
  • apparatus for anaerobic digestion of biodegradable waste material comprising a closed substantially vertical cylindrical tank having a central axis, a gas delivery duct having an outlet disposed near to the central axis of the tank and to the base of the tank, and a mixing assembly located within the tank for rotation about the central axis of the tank, the mixing assembly comprising a gas-holding member which has an open lower surface and which defines an annulus concentric with the said central axis, a part of the annulus defined by the gas-holding member being positioned above the outlet of the gas delivery duct, and a gas distribution arm extending substantially radially outwardly from the said gas-holding member towards the periphery of the tank and having exhaust apertures spaced along the length of the arm for delivering gas from the gas-holding member at different radial distances along the arm, means supporting the gas-holding member and the gas distribution arm near the base of the tank, and drive means for causing the mixing assembly to be rotated about the said central axis, a gas delivery duct having
  • the drive means may comprise a rotatable member positioned within the tank and near the periphery thereof at a similar level in the tank to the mixing assembly, a motor located outside the tank and linked to the rotatable member by means enabling the motor to drive the rotatable member, a wheel located concentrically with the axis of the tank.and rigidly connected to the gas-holding member and the gas distribution arm and an endless flexible drive member embracing the circumferences of the rotatable member and the wheel for transmitting rotational movement from the rotatable member to the wheel.
  • the drive means may comprise gas lift draught tubes mounted on the gas distribution arm for receiving gas from the arm, each gas lift draught tube comprising a vertical portion connected through a right angle bend to a horizontal portion.
  • the driving force is provided by a reaction force developed at the right angle bend.
  • each gas lift draught tube comprises two horizontal portions connected through right angle bends to opposite ends of the vertical portion.
  • the drive means may comprise gas lift draught tubes mounted on the gas distribution arm for receiving gas from the arm and including a vertical portion incorporating therein a propeller turbine, and means connecting the output from said turbine to individual drive wheels which support the gas distribution arm.
  • the drive means comprises a rotatable member positioned within the tank above the level of liquid in the tank, and a motor located outside the tank and linked to the rotatable member by means enabling the motor to drive the rotatable member, and the supporting means comprises a torque transmitting cage suspended from the rotatable member and carrying the mixing assembly.
  • FIG. 1 of the accompanying drawings there is shown a closed anaerobic digestion tank indicated generally by the reference numeral 1, the tank comprising a lower digester portion 2 and an upper gas storage portion 3.
  • a mixing assembly indicated generally by the reference numeral 4, which is capable of rotation about a central vertical member 5 the axis of which is concentric with the central vertical axis of the tank 1.
  • the mixing assembly 4 is supported on supporting means constituted by a horizontal wheel 6 which has pivotably mounted beneath its circumference a plurality of vertical wheels 7 which contact the base of the tank 1.
  • the mixing assembly 4 essentially comprises a gas-holding member 8 and a gas distribution arm 9.
  • Both the gas holding member 8 and the gas distribution arm 9 are constituted by inverted channel members.
  • the gas-holding member 8 is arranged in a circle and thus defines an annulus concentric with the axis of the central vertical member 5 and the central vertical axis of the tank 1.
  • the gas distribution arm 9 which is connected to and extends radially from the outer circumference of the gas-holding member 8 includes a plurality of cut-away portions 1.0 in the lower periphery of its inverted channel member.
  • the cut-away portions 10 may be U-shaped or V-shaped.
  • the gas is supplied to the gas-holding member 8 from the upper gas storage portion 3 of the tank 1 by a pump 11 which pumps gas through a gas delivery duct 12 having an outlet 13 placed vertically beneath a part of the annulus defined by the gas-holding member 8. Accordingly, gas pumped from the upper gas storage portion 3 through the gas delivery duct 12 will be delivered to the gas holding member 8. Gas so received by the gas-holding member 8 is also passed along the gas distribution arm 9, and retained in the connected inverted channels of both the gas-holding member 8 and the gas distribution arm 9 until the volume of gas is such that the level of gas held beneath the level of the liquid in the lower digester porton 2 of the tank 1 reaches the upper peripheries of the cut-away portions 10 in the gas distribution arm 9. Gas bubbles are then emitted through the cut-away portions 10 and provide a gas lift mixing effect in the lower digester portion 2 of the tank 1.
  • the mixing assembly 4 is driven by a motor 14 positioned outside the tank 1 and connected through a drive shaft 15 to a vertically rotatable member 16 positioned near the periphery of the lower digester portion 2.
  • An endless steel cable 17 is passed several times (for example five or six times) around the circumference of the rotatable member 16 and also twice around the outer circumference of the horizontal wheel 6, the endless steel cable 17 thereby transmitting the drive from the rotatable member 16 to the mixing assembly 4 through the horizontal wheel 6 which supports the gas-holding member 8 and the gas distribution arm 9.
  • the mixing assembly 4 is thereby slowly rotated in the lower digester portion 2 so that the gas distribution arm 9 is traversed slowly through the solids assembled near the base of the lower digester portion 2 and the gas emitted from the cut-away portions 10 in the gas distribution arm 9 causes vertical movements disturbing the solids near the base of the lower digester portion 2.
  • gas delivered from the outlet of the gas delivery duct 12 continually replenishes the gas stored in the gas-holding member 8 and the gas distribution arm 9 so that there is an endless emission of gas lift bubbles from the cut-away portions 10 throughout the rotation of the mixing assembly 4.
  • FIG. 2 An alternative embodiment of the mixing assembly including the gas-holding member 8 and the gas distribution arm 9 is shown in Figure 2 of the accompanying drawings.
  • This includes a horizontally extending arm 21 which is vertically above and substantially parallel to the gas distribution arm 9.
  • the arm 21 is mounted to the central vertical member 5 by bearings 22 similar to the bearings 18 supporting the gas-holding member 8.
  • the gas distribution arm 9 and the arm 21 together support gas lift draught tubes 23 which include a vertical portion 23a which is connected through a right angle bend 23b to a horizontal portion 23c.
  • the gas lift draught tubes 23 also include a lower horizontal portion 23d which terminates in a broader member 23e which has an aperture permitting entry of liquid into the gas lift draught tube 23.
  • the gas distribution member 9 of Figure 2 delivers gas into the gas lift tubes 23 which, being immersed in the lower digester portion of the tank, contain liquids and solids material being subjected to anaerobic digestion.
  • the emission of the gas bubbles at the foot of the vertical portions 23a of the gas lift tubes 23 causes liquid within these vertical portions to be raised vertically with a simultaneous drawing in of further liquid or sludge through the apertures in the broader members 23e and discharge of liquid from the upper horizontal portion 23c.
  • a gas lift draught tube 23 positioned on the mixing assembly at the end of the gas distribution arm 9 remote from the central member 5 is advantageously of a greater cross- sectional area than the gas lift draught tube positioned nearer to the central member 5. Any desired number of gas lift draught tubes 23 can be provided in association with the gas distribution arm 9.
  • the mixing assembly of Figure 2 may also be modified by the provision of one or more cut-away portions, similar to the cut-away portions 10 shown in Figure 1, in the gas distribution arm 9, which cut-away portions are not associated with gas lift draught tubes 23.
  • the mixing assembly of Figure 2 can be mounted on vertical wheels so that the weight of the assembly including the gas distribution arm 9, the horizontal arm 21 and the gas lift draught tubes 23 is supported by the wheels rather than by the central member 5.
  • the mixing assembly of Figure 2 can be supported on bearings located above the level of liquid under treatment, for example the bearings may be outside and above the tank.
  • the mixing assembly may extend over a diameter of the tank 1 by the provision of two radial gas distribution arms 9, rather than just along a radius as shown in the mixing assembly of Figure 1 which has a single gas distribution arm 9.
  • the mixing assembly of Figure 1 may be modified to include a second gas distribution arm 9, if desired, and similarly the mixing assembly of Figure 2 could be constructed with only a single gas distribution arm 9.
  • the gas lift draught tubes 23 could be constructed with only one of the horizontal portions, that is to say either the horizontal portions 23c or the horizontal portion 23d, the reaction force at the single right angle bend in a plurality of gas lift draught tubes mounted on the gas distribution arm 9 being sufficient to move the mixing assembly.
  • gas lift draught tubes 23 of Figure 2 could be provided without any horizontal portions 23c and 23d but with propeller turbines located in the vertical portions 23a with drive means connecting the output from the turbines to vertical wheels supporting the mixing assembly immediately beneath respective gas lift draught tubes 23.
  • FIG. 3 there is shown another embodiment of apparatus according to the present invention, and incorporating a mixing assembly comprising a gas-holding member 8 and a pair of gas distribution arms 9 similar to the gas distribution arm 9 of Figure 1.
  • the central vertical member 5 which is a supporting column of concrete or steel, carries a disc 30 at a level which is below the roof of the tank 1 but above the level of liquid in the tank 1.
  • the disc 30, which is made of the same material as the vertical member 5 is thus located in the upper gas storage portion 3 of the tank 1.
  • the disc 30 constitutes a platform within the tank 1 on which an internally toothed ring gear wheel 31 is mounted on bearings. From the outer periphery 32 of the gear wheel 31 there is suspended, by means of bolts or other suitable fixing means 33, a torque transmission cage 34.
  • the torque transmission cage 34 carries the gas-holding member 8 and the gas distribution arms 9 which are connected to the cage 34 by supporting wires 35.
  • the gas distribution arms 9 are therefor connected directly to the gas-holding member 8 for supply of gas, and also to the cage 34 by the supporting wires 35.
  • the internally toothed ring gear wheel 31 is driven by a gear 38 from a standard reduction gear motor 36 through any suitable gear means 37.
  • the drive for the gear wheel 31 may, conveniently, include a worm and wheel reducer gear.
  • the gas supply to the gas-holding member 8 of Figure 3 is essentially similar to that described with reference to Figure 1.
  • the gas-holding member 8 is provided with four steady bearings 39 of lignum-vitae, or similar material, for maintaining the suspended mixing assembly in position during rotation.
  • Figure 3 has the advantage over that of Figure 1 of accessibility of the supporting means for maintenance and repair.
  • the supporting means could be external to the tank 1, for example on the roof of the tank 1.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Microbiology (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing Of Solid Wastes (AREA)
EP78300116A 1977-07-05 1978-07-04 Apparatus and method for anaerobic digestion of biodegradable waste material Expired EP0000293B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2818377 1977-07-05
GB28183/77A GB1600283A (en) 1977-07-05 1977-07-05 Apparatus for anaerobic digestion of biodegradable waste material

Publications (2)

Publication Number Publication Date
EP0000293A1 EP0000293A1 (en) 1979-01-10
EP0000293B1 true EP0000293B1 (en) 1982-06-02

Family

ID=10271605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300116A Expired EP0000293B1 (en) 1977-07-05 1978-07-04 Apparatus and method for anaerobic digestion of biodegradable waste material

Country Status (10)

Country Link
US (1) US4179220A (it)
EP (1) EP0000293B1 (it)
JP (1) JPS5439961A (it)
AU (1) AU519474B2 (it)
CA (1) CA1091369A (it)
DE (1) DE2861875D1 (it)
ES (1) ES471481A1 (it)
GB (1) GB1600283A (it)
IN (1) IN149944B (it)
IT (1) IT1111486B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3324072A1 (de) * 1982-07-05 1984-01-05 Wilhelm von der Dr.-Ing. 1040 Wien Emde Vorrichtung zur anaeroben abwasserreinigung
WO2007140744A1 (de) 2006-06-08 2007-12-13 Johan Verink Vorrichtung zur abwasserbehandlung sowie eine mit einer solchen vorrichtung ausgestattete anlage

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2827996A1 (de) * 1978-06-26 1980-01-17 Stengelin Volker Vorrichtung zur biologischen reinigung von abwasser
JPS58125876U (ja) * 1982-02-18 1983-08-26 ソニー株式会社 発振周波数検出回路
JPS58125014U (ja) * 1982-02-18 1983-08-25 呉羽化学工業株式会社 パリソン反転供給装置
DE3379059D1 (en) * 1982-10-19 1989-03-02 Secr Defence Brit Organometallic chemical vapour deposition of films
GB8827302D0 (en) * 1988-11-23 1988-12-29 Nytek As Mixing device
JP3253212B2 (ja) * 1993-03-31 2002-02-04 関西化学機械製作株式会社 攪拌翼および攪拌方法
US5785424A (en) * 1993-04-30 1998-07-28 Kansai Chemical Engineering Co. Ltd. Agitator blade having agitators with open first and second ends and inner fabrics therein
US5863119A (en) * 1996-07-03 1999-01-26 J. R. Simplot Company Apparatus for mixing a slurry within a bioreactor vessel
US6207055B1 (en) 1997-06-16 2001-03-27 Idaho Research Foundation, Inc. Method and apparatus for forming a slurry
DE69810067T2 (de) 1997-11-14 2003-10-02 Kansai Chemical Engineering Co., Ltd. Vorrichtung und Verfahren zur Flüssigkeitsejektion
CN1322238A (zh) 1998-10-09 2001-11-14 荷兰联合利华有限公司 水软化和洗涤组合物
AU3427899A (en) * 1998-10-12 2000-05-01 Petrojet International Hydrodynamic stirring device and jet pipe
CA2298879C (en) 1999-02-22 2004-09-14 Hideo Noda Liquid ejection apparatus and liquid ejection method
DE10127228B4 (de) * 2001-05-22 2005-03-03 Xaver Lipp Vorrichtung und Verfahren zum Gären organischer Substanzen
US8366312B1 (en) * 2006-08-01 2013-02-05 United Services Automobile Association (Usaa) Systems to store and agitate fuel
US20100110824A1 (en) * 2007-05-18 2010-05-06 Kabushiki Kaisha Teikoku Denki Seisakusho Dispersion/stirring apparatus and dispersion tank
GB2457681B (en) * 2008-02-21 2013-02-27 Farm Renewable Enviromental Energy Ltd A gas actuated mixing system
WO2012015833A1 (en) 2010-07-27 2012-02-02 WISErg Corporation Methods and systems for processing organic material
US9181138B2 (en) 2013-03-12 2015-11-10 WISErg Corporation Methods and systems for stabilizing organic material
ITUB20152949A1 (it) * 2015-08-06 2017-02-06 Sms Meer Spa Impianto e metodo di degasaggio sottovuoto dell?acciaio liquido
EP3456408B1 (en) * 2017-09-13 2020-07-22 Depuracion Biologica Y Bacteriologica de Aguas Residuales, S.L. Plant for purfiying slurry
US20190084896A1 (en) * 2017-09-15 2019-03-21 Daniel T. Scott Aerobic Composting System
CN109433795A (zh) * 2018-11-06 2019-03-08 济源市众帮环境保洁有限公司 一种有机垃圾处理设备系统
CN110756096A (zh) * 2019-11-28 2020-02-07 耒阳市旗心电子科技有限公司 一种电子产品生产用物料分散设备
US11731551B1 (en) 2022-04-27 2023-08-22 Modology Design Group Systems and methods for an automatic modular housing delivery system
CN115539765B (zh) * 2022-08-25 2023-05-23 苏州易合医药有限公司 一种粉末旋转流化装置及其方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1887490A (en) * 1932-03-14 1932-11-15 Imhoff Karl Method of and apparatus for the treatment of sludge, sewage, and the like
US2173932A (en) * 1937-02-19 1939-09-26 J W Swanson Septic tank sludge ejector
US2458061A (en) * 1947-07-12 1949-01-04 Dorr Co Slurry mixer
BE493382A (it) * 1949-05-06
US2768136A (en) * 1953-12-23 1956-10-23 Pacific Flush Tank Co Gas discharge device for sewage digestion tanks
FR1174321A (fr) * 1957-04-19 1959-03-10 Dorr Oliver Inc Traitement d'eaux d'égouts
DE2023981A1 (de) * 1970-05-15 1971-11-25 Schnyder H Verfahren und Vorrichtung zur kontinuierlichen Umwälzung und Begasung einer Flüssigkeit
US4100610A (en) * 1975-12-23 1978-07-11 John Blue Company Division Of Subscription Television, Inc. Rotating nozzle sparging system for suspension fertilizer tanks
US4089507A (en) * 1976-03-15 1978-05-16 Sumitomo Heavy Industries, Ltd. Method and apparatus for maintaining uniformity of mixed dust slurry stored in a basin

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3324072A1 (de) * 1982-07-05 1984-01-05 Wilhelm von der Dr.-Ing. 1040 Wien Emde Vorrichtung zur anaeroben abwasserreinigung
WO2007140744A1 (de) 2006-06-08 2007-12-13 Johan Verink Vorrichtung zur abwasserbehandlung sowie eine mit einer solchen vorrichtung ausgestattete anlage

Also Published As

Publication number Publication date
GB1600283A (en) 1981-10-14
DE2861875D1 (en) 1982-07-22
AU519474B2 (en) 1981-12-03
JPS6152758B2 (it) 1986-11-14
EP0000293A1 (en) 1979-01-10
IN149944B (it) 1982-06-12
IT7868566A0 (it) 1978-07-04
CA1091369A (en) 1980-12-09
AU3778678A (en) 1980-01-10
JPS5439961A (en) 1979-03-28
IT1111486B (it) 1986-01-13
US4179220A (en) 1979-12-18
ES471481A1 (es) 1980-12-01

Similar Documents

Publication Publication Date Title
EP0000293B1 (en) Apparatus and method for anaerobic digestion of biodegradable waste material
US4668387A (en) Deep submergence rotating biological contactor apparatus
EP0015050B1 (en) Fluids mixing apparatus
US5916491A (en) Gas-liquid vortex mixer and method
CA2276760C (en) Device for stirring and aerating a liquid and eliminating the foam in a vat for treating this liquid
CA2621460C (en) Agitator for a fermenter, fermenter and method for operating a fermenter
US5744105A (en) Slurry reactor
US3734469A (en) Reactor vessel and up-down mixer
US3779531A (en) Top driven material shearing mixer and aerator
US4145383A (en) Slurry aeration method and apparatus
US4655918A (en) Apparatus for cleaning waste water
US5013429A (en) Apparatus for stabilizing sludge
US20050126997A1 (en) Process and device for biological treatment of a suspension in a bioreactor with integrated hydraulic bottom layer removal
US4207275A (en) Mixing apparatus
US5248485A (en) Method for mixing liquid, solids and gas and for simultaneously separating gas or gas and solids from the liquid
US2223257A (en) Sewage treating apparatus
US3951758A (en) Method of operating a purifying plant and tank for practicing said method
US3208734A (en) Aeration of liquids
EP0021470A1 (de) Hohlrührer zum Eintragen von Gas in eine Flüssigkeit
CN2156184Y (zh) 深层曝气机
US7186335B2 (en) Process and device for biological treatment of a suspension in a bioreactor with integrated hydraulic top scum treatment
WO1993021301A1 (en) Apparatus for suspension cultivating cells of tissues and microorganisms
CN2192619Y (zh) 一种双螺旋鼓风曝气器
CN219209096U (zh) 一种污水处理用沉淀池
CN216614147U (zh) 一种生物炭活化过硫酸盐处理制药废水的反应器

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

AK Designated contracting states

Designated state(s): BE CH DE FR

17P Request for examination filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE CH DE FR

REF Corresponds to:

Ref document number: 2861875

Country of ref document: DE

Date of ref document: 19820722

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19840605

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19840630

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19840730

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19840927

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19890731

Ref country code: BE

Effective date: 19890731

BERE Be: lapsed

Owner name: BIOMECHANICS LTD

Effective date: 19890731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19900330

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19900403

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT