WO1999016730A1 - Digesteur - Google Patents

Digesteur Download PDF

Info

Publication number
WO1999016730A1
WO1999016730A1 PCT/GB1998/002842 GB9802842W WO9916730A1 WO 1999016730 A1 WO1999016730 A1 WO 1999016730A1 GB 9802842 W GB9802842 W GB 9802842W WO 9916730 A1 WO9916730 A1 WO 9916730A1
Authority
WO
WIPO (PCT)
Prior art keywords
digester
compartment
treatment
compartments
transfer
Prior art date
Application number
PCT/GB1998/002842
Other languages
English (en)
Inventor
Arthur Stanley Pittwood
Original Assignee
Hadee Engineering Company Limited
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 Hadee Engineering Company Limited filed Critical Hadee Engineering Company Limited
Priority to AU91737/98A priority Critical patent/AU9173798A/en
Priority to GB0006650A priority patent/GB2344584B/en
Publication of WO1999016730A1 publication Critical patent/WO1999016730A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/90—Apparatus therefor
    • C05F17/95—Devices in which the material is conveyed essentially vertically between inlet and discharge means
    • C05F17/955—Devices in which the material is conveyed essentially vertically between inlet and discharge means the material going from platform to platform
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/60—Heating or cooling during the treatment
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock
    • Y02P20/145—Feedstock the feedstock being materials of biological origin
    • 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 a digester in which biodegradable material is composted, in use, so that treated material leaves the digester with a stable C/N ratio, and an object of the invention is to provide such a digester in an improved form.
  • a digester having a first treatment compartment for receiving a batch of biodegradable material to be composted in the digester, in use, a second treatment compartment arranged to receive material from the first compartment in a controlled manner, a third treatment compartment arranged to receive material from the second compartment in a controlled manner, and ducting means for the controlled transfer of heat from said third compartment to said second compartment.
  • the second treatment compartment in use, receives material directly from the first treatment compartment, and most preferably the third treatment compartment, in use, receives material directly from the second treatment compartment.
  • a digester having a first treatment compartment for receiving a batch of biodegradable material to be composted in the digester, in use, a plurality of further treatment compartments arranged so as, in use, successively to transfer material from the first compartment, through the digester, to an outlet thereof, fluid reservoir means in one of said further compartments to provide fluid, in use, for spraying material in said first compartment or any one of said further compartments, and means for utilising heat from another of said further treatment compartments to raise the temperature of fluid in said reservoir.
  • a digester having a first treatment compartment for receiving a batch of biodegradable material to be composted in the digester, in use, a second treatment compartment arranged to receive material which has left said first compartment and is passing through the digester, transfer means for transferring material from the second compartment to the first compartment, and material moving means in the second compartment for moving material therein to said transfer means.
  • Figure 1 is a schematic internal side view of a digester of one embodiment of the invention
  • Figure 2 is a schematic view on line A-A of Figure 1 ,
  • Figure 3 is a schematic internal side view of a digester of a second embodiment of the invention.
  • Figure 4 is a schematic view on both lines B-B and C-C of Figure 3,
  • Figure 5 is a schematic diagrammatic view showing a spraying system of the digester
  • Figure 6 is a schematic diagrammatic view showing an air flow system of the digester.
  • FIGS 1 and 2 show a first embodiment of a digester 10 of the present invention, this embodiment, in fact, incorporating two inventive concepts, as will be described, which can be used, as shown, together, or alternatively, independently.
  • the digester is formed with an upright hollow cylindrical body or casing 1 1 which is divided vertically into a series of treatment compartments by respective vertically spaced horizontal floors 12-15 within the cylindrical body 1 1.
  • the uppermost or first compartment being denoted by the numeral 16
  • the second compartment immediately below the first compartment, being denoted by the numeral 17, and so on for the third and fourth compartments 18, 19 respectively.
  • the top of the body 1 1 is closed, but is provided with an inlet 20 for supplying, at intervals, batches of biodegradable material which is to be composted by passage through the digester.
  • an outlet conveyor 21 At the bottom of the digester is an outlet conveyor 21 within an outlet enclosure 21 a which is defined at the bottom of the body 1 1 below the fourth compartment 19, i.e. beneath the floor 15.
  • the conveyor transports treated material out of the digester.
  • respective self sealing transfer doors 22-25 which close or open respective transfer openings 26-29 respectively in the floors, (as shown for the door 22 and opening 26 of the floor 12 in Figure 2), the transfer doors moving between their respective open and closed positions in a horizontal plane immediately below their associated respective floors, or being hinged to move in a vertical plane.
  • the transfer openings are for allowing material in the digester to pass from one compartment to the compartment beneath it and thereby pass fully through the digester from the first compartment, successively through the other compartments and finally into the outlet enclosure.
  • the inlet is provided with a slide door 30 for opening or closing the inlet, the door in its closed position preventing escape of fumes and heat upwardly out of the digester from the first compartment.
  • the doors 22-25 and 30 can be operated by reciprocation of pneumatically controlled pistons in respective cylinders, with pressure operated piston location switches.
  • each compartment is a set of rotatable arms mounted on a rotational drive unit.
  • the drive unit could possibly be a central axial shaft extending vertically upwardly through the casing and having the arms in each compartment extending therefrom.
  • the arms can extend radially, or be somewhat offset, as shown, for example, in Figure 4.
  • the number and orientation of arms in each compartment is not critical provided they perform their desired function, which is to disturb the material and/or to move it to the transfer opening of its compartment.
  • alternatively separate drive means can be provided for each compartment as shown schematically in Figure 1 , with the drive means being denoted by the numeral 31.
  • the arms in each of the compartments are rotatable independently of one another.
  • the arms in the four compartments 16 to 19 respectively are denoted by the numerals 32-35.
  • the digester has ducting to communicate various compartments with one another for the transference of heat, and also to take heated air from the digester to a biofilter unit disposed exteriorly of the digester, from which cleaned air is pumped. Accordingly it can be seen that in the embodiment of Figure 1 there are outlet ducts 36, 37 respectively from the compartments 18, 19, these ducts 36, 37 joining a common duct 38 which leads into the top of the second compartment 17. Appropriate valves 39, 40 respectively, for example pneumatically controlled, are contained in the ducts 36,37 for controlling flow of heated air into the common duct 38 as will be described.
  • Further outlet ducts 41 , 42 respectively extend from the first and second compartments, these ducts leading to a common duct 43 which itself extends to the biofilter referred to above.
  • valves 44, 45 respectively, preferable of the same form as the valves 39, 40. All the valves may be remotely operated.
  • the duct may communicate with the biofilter via an air scrubber, and an air humidifier, with a recirculation and dosing control unit being associated with the air scrubber. Operation of the digester of Figures 1 and 2 will now be described.
  • the normal situation in the compartments prior to feeding a batch of material into the digester would be for the first compartment to be empty and all the other compartments 17, 18 and 19 to contain biodegradable material which is to be composted as it passes downwardly through the digester.
  • the inlet slide door 30 would be open and at least the transfer door 22 would be closed.
  • the inlet slide door At the completion of the feeding of a batch of biodegradable material into the digester, the inlet slide door would closed.
  • the further opening and closing of the inlet door and the transfer doors to allow transfer of material down through the compartments to the outlet conveyor, would be controlled by a timing regime which is outside the scope of this patent, but which could be of conventional form. It will be appreciated that material will fall through the transfer openings 26-29 respectively from one compartment to the one below it successively as the transfer doors are opened.
  • the timing regime described would be such so that material would spend an appropriate time interval within a specific compartment before passing to the compartment below it and eventually finally to the outlet enclosure. It will be appreciated that the lowermost compartment is emptied before each downwards transfer of material through the digester once material has reached said compartment.
  • a series of water sprays 46 (Figure 5) including at least one arranged to spray water onto material before or as it is transferred from at least compartment 17 to compartment 18.
  • the positions and number of sprays can be varied as required.
  • the operation of these sprays would be by means of a control system, based on a time- cycle with variations initiated by the temperature of the material detected by temperature probes 47, such as a thermocouple, in the various compartments, which time cycle is also outside the scope of this patent, but which again may be of known form.
  • the numbers and positions of the probes 46 in each compartment can be varied as required.
  • the example shown in Figure 1 is a digester which incorporates two inventive features which are shown used together. However, as also mentioned above, these two features can be used independently of one another.
  • a preferred embodiment of one of the inventive features is the transference of heat from at least one of the compartments into the compartment immediately below the compartment into which material is initially fed.
  • a preferred embodiment of the other inventive feature relates to the provision of fluid, preferably water, storage means, in one compartment, which storage means is heated by heat transferred from another compartment below the compartment in which the storage means is contained.
  • the water to be delivered via the sprays 46 onto material as it is transferred from compartment 17 to compartment 18 will, prior to the spraying, be held in a water reservoir or tank 48 which is disposed in the compartment 17 immediately below the floor 12 of compartment 16. The water would normally be pumped to the digester.
  • heat is transferred from compartment 18 and possibly also lower compartments such as compartment 19, into and across the top of compartment 1 7 for three purposes, namely i) to impart hot air into compartment 17 to maintain and possibly increase the temperature of the material within that compartment, ii) to heat the underside of the floor 12 of compartment 16, thus imparting heat into the material in the first compartment, without any physical disturbance of that material, such as by movement of the arms
  • the water may be fed into the tank in small doses over a period of, for example 12 hours, starting after transfer of material from compartment 17 into compartment 18 (during which it has been sprayed from the tank supply) has been completed.
  • a somewhat different spraying arrangement will be described later with reference to Figure 5.
  • Probes 47 would normally be arranged to monitor the temperature of the material in each of the compartments, the probes being connected to a control system, which is outside the scope of this patent, but which again may be of known form.
  • the control system would be such that when within a pre-set time scale the temperature in the compartment is low, the compartment arms will rotate with air blown through the arms to encourage microbiological action within the material.
  • Any suitable means can be provided for blowing such air through the arms 32-35 as they rotate. When the temperature in the compartment is high, the compartment arms will rotate without air blowing therethrough, so that there is release of excess heat into the top of the respective compartment. Again suitable means can be provided for rotation of the arms without the blowing of air therethrough into the compartment.
  • a suitable air blowing system will be described later with reference to Figure 6. The air could be blown into the compartment(s) other than through the arms.
  • Valve 44 normally closed, and fully opens only when the temperature in the material in compartment 16 rises above a pre-set temperature.
  • Valve 45- normally closed Opens fully when temperature in material in compartment 17 rises above a preset temperature or when any of the valves associated with a lower compartment is fully open. Opens to a partial pre-set position when temperature of material in compartment 17 falls below a pre-set level or when one of the valves associated with a lower compartment partially opens. Will return to closed position when temperature falls below the pre-set level or when all lower compartment valves are closed.
  • Valve 39, 40 normally closed. Opens to a partial pre-set (and, if applicable, position when temperature in the respective similar valves compartment falls below a low pre-set level associated with lower and to fully open position when the compartments) - temperature rises above a high pre-set level.
  • Valves return to the closed position when temperature returns to between the low and high pre-set levels.
  • a further inventive concept is shown incorporated in the digester of Figures 3 and 4, this being utilisable independently of either of the inventive concepts described and illustrated with respect to Figure 1 , but also being for use with one or both of said inventive concepts if desired.
  • the basic form of digester 49 shown in Figures 3 and 4 is the same as that shown in Figures 1 and 2, but for clarity the water tank and the ducting for transference of heat between compartments and to the biofilter are not shown. Otherwise the construction and operation is of the same form as described for the digester 10, so that again the operation of the arms and transfer doors are controlled by a pre-set time sequence and also by a series of temperature probes set in each compartment.
  • One of the intermittent operations controlled by the temperature probes 47 is that of rotating a set of arms just above the floor of a particular compartment when the material in the compartment rises in temperature above a pre-set level. At such periods of high temperature induced rotation, air is not passed through the arms.
  • Identical reference numerals to those used in Figures 1 and 2 are used in Figures 3 and 4 for identifying identical items.
  • the main difference with the digester 49 is that the floor of each compartment other than the uppermost one 12 may be extended at one side, as shown in Figure 4 for compartments 17 and 18.
  • the extensions of these floors have fitted thereto a screw conveyor or an elevating screw 50 at the exterior of the main part of the body of the digester, the screw 50 extending vertically upwardly beyond the closed top of the digester 49.
  • a chute 51 extends from the top of the elevating screw downwards into the first compartment 16.
  • any other suitable transfer means can be provided for transferring material into the uppermost compartment from one or more other compartments therebelow, and means other than mechanical means may be used if appropriate.
  • water sprays can be provided in digester 10 and digester 49, with the water tank 48 in any of the compartments, except the uppermost one, being heated by transfer of heat into that compartment from one or more of the other compartments.
  • tanks could be provided in more than one compartment. Although normally heat would be transferred from a compartment to one or more compartments above it, this is not essential.
  • heated water from a tank could be piped to an upper or lower compartment for spraying therein.
  • FIG. 5 shows a modified spraying arrangement with a boiler 52, outside of the digester, being fed at 53 with mains water and at 54 with rainwater, e.g. from the digester roof.
  • the water in the boiler is heated by an immersion heater 55, heated water being fed from the boiler by way of a pump 56 through a flow meter 57 and flow control valve 58 to a vertical pipe 59 extending upwardly along the side of the digester, with branch pipes therefrom to the respective digester compartments.
  • a fluid reservoir, namely the tank 48 is formed in compartment 17, and also, in the example illustrated, in compartment 18, by an enlargement of the branch pipe.
  • water heated by external means is further heated by heat generated naturally in the digester for two compartments.
  • the arrangement could be modified so that the additionally heated water is sprayed in any number of compartments.
  • the ducting for supplying heat from one or more other digester compartments to the compartment or compartments having a water tank 48 is not shown.
  • the spray water could be heated in the boiler only, without heat being added in the digester.
  • FIG. 6 shows how air blowers 60 can introduce air to the compartments for blowing it through the arms 32 to 35.
  • the air is in each case introduced into the chamber below that containing the arms through which the air is to be blown, and fed upwardly through pipework.
  • the air can pass along a passage in the arms and exit through suitable outlet holes.
  • air can pass from all the compartments to be led to the biofilter.
  • Pneumatically operated valves 62 can control exhaust of air from the compartments.
  • Each compartment can be provided with a weighted air inlet flap 61. Prior to waste material entering the digester through inlet 20, it can be fed to a shredder which itself can be sprayed with mains water to treat material passing therethrough.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Biotechnology (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microbiology (AREA)
  • Molecular Biology (AREA)
  • Organic Chemistry (AREA)
  • Fertilizers (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

L'invention concerne un digesteur (10, 49) de compostage de matières biodégradables, qui comprend une série de compartiments de traitement (16 à 19, 21a) placés les uns au-dessus des autres et dont le plancher comporte une ouverture qui se ferme pour réguler le passage des matières à travers les compartiments du digesteur. Le compartiment supérieur (16) comporte un moyen d'admission (20) pour recevoir une cuvée de matières à traiter et des moyens (36 à 40) pour transférer la chaleur à l'intérieur du compartiment (17) situé immédiatement au-dessous de lui afin de chauffer le plancher dudit compartiment et améliorer la digestion de la matière qu'il contient, la chaleur étant transférée des compartiments inférieurs les plus chauds (18, 19). Le dispositif comprend également des moyens (46) pour pulvériser de l'eau dans les chambres (cette eau étant chauffée par la chaleur provenant d'un des compartiments) et des moyens (50) pour souffler de l'air dans les compartiments. Un moyen de transfert, tel qu'un vis de relevage (50), peut être installé pour déplacer les matières d'un compartiment inférieur vers le compartiment supérieur (16).
PCT/GB1998/002842 1997-10-01 1998-09-18 Digesteur WO1999016730A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU91737/98A AU9173798A (en) 1997-10-01 1998-09-18 Digester
GB0006650A GB2344584B (en) 1997-10-01 1998-09-18 Digester

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9720750A GB9720750D0 (en) 1997-10-01 1997-10-01 Digester
GB9720750.0 1997-10-01

Publications (1)

Publication Number Publication Date
WO1999016730A1 true WO1999016730A1 (fr) 1999-04-08

Family

ID=10819848

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/002842 WO1999016730A1 (fr) 1997-10-01 1998-09-18 Digesteur

Country Status (3)

Country Link
AU (1) AU9173798A (fr)
GB (2) GB9720750D0 (fr)
WO (1) WO1999016730A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1508725A1 (fr) * 2003-08-20 2005-02-23 Hadee Engineering Company Limited Entraínement rotatif avec vérins hydrauliques
WO2006079138A1 (fr) * 2005-01-27 2006-08-03 Compost Oven Pty Ltd. Appareil de compostage a four
US7581460B2 (en) 2004-11-30 2009-09-01 Civic Environmental Systems Limited Drive assembly
WO2010022939A1 (fr) * 2008-08-29 2010-03-04 Wuester Heinrich Composteur
WO2014064338A1 (fr) 2012-10-24 2014-05-01 Ecolution Oy Procédé et système pour le traitement de déchets organiques
EP2805932A1 (fr) * 2013-05-22 2014-11-26 Grace Organic AB Système de compostage de déchets organiques et procédé de compostage de déchets organiques
CN112110624A (zh) * 2020-10-16 2020-12-22 台州瑟知科技有限公司 一种间隔进行搅拌并自动控制排料的污泥发酵装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878112A (en) * 1955-08-17 1959-03-17 Union Stock Yard & Transit Co Chicago Method and apparatus for composting manure
CH382773A (fr) * 1957-06-20 1964-10-15 Jammes Raphael Procédé de traitement des matériaux fermentescibles en vue d'obtenir des terreaux fertilisants et installation de digestion pour la mise en oeuvre de ce procédé
GB1060461A (en) * 1963-02-12 1967-03-01 Simon Handling Eng Ltd Improvements in bacteriological digesters for conversion of organic waste
FR1567550A (fr) * 1967-06-01 1969-05-16
BE760693A (fr) * 1970-12-22 1971-05-27 Int Combustion Holdings Ltd Perfectionnements a la transformation de matieres en compost.
DE2809344A1 (de) * 1978-03-03 1979-09-13 Weiss Geb Kg Verfahren zum kompostieren von organischen abfaellen und/oder klaerschlamm und einrichtung zur durchfuehrung des verfahrens
EP0085000A1 (fr) * 1982-01-20 1983-08-03 Association Point d'Acces Technologique 81 Installation de compostage d'éléments d'origines diverses par fermentation aérobie
US5258306A (en) * 1992-03-26 1993-11-02 Kenneth Goldfarb Silo composting apparatus
DE4328052A1 (de) * 1993-08-20 1995-02-23 Gutehoffnungshuette Man Verfahren und Vorrichtung zur Kompostierung von Rottegut

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878112A (en) * 1955-08-17 1959-03-17 Union Stock Yard & Transit Co Chicago Method and apparatus for composting manure
CH382773A (fr) * 1957-06-20 1964-10-15 Jammes Raphael Procédé de traitement des matériaux fermentescibles en vue d'obtenir des terreaux fertilisants et installation de digestion pour la mise en oeuvre de ce procédé
GB1060461A (en) * 1963-02-12 1967-03-01 Simon Handling Eng Ltd Improvements in bacteriological digesters for conversion of organic waste
FR1567550A (fr) * 1967-06-01 1969-05-16
BE760693A (fr) * 1970-12-22 1971-05-27 Int Combustion Holdings Ltd Perfectionnements a la transformation de matieres en compost.
DE2809344A1 (de) * 1978-03-03 1979-09-13 Weiss Geb Kg Verfahren zum kompostieren von organischen abfaellen und/oder klaerschlamm und einrichtung zur durchfuehrung des verfahrens
EP0085000A1 (fr) * 1982-01-20 1983-08-03 Association Point d'Acces Technologique 81 Installation de compostage d'éléments d'origines diverses par fermentation aérobie
US5258306A (en) * 1992-03-26 1993-11-02 Kenneth Goldfarb Silo composting apparatus
DE4328052A1 (de) * 1993-08-20 1995-02-23 Gutehoffnungshuette Man Verfahren und Vorrichtung zur Kompostierung von Rottegut

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1508725A1 (fr) * 2003-08-20 2005-02-23 Hadee Engineering Company Limited Entraínement rotatif avec vérins hydrauliques
US7581460B2 (en) 2004-11-30 2009-09-01 Civic Environmental Systems Limited Drive assembly
WO2006079138A1 (fr) * 2005-01-27 2006-08-03 Compost Oven Pty Ltd. Appareil de compostage a four
WO2010022939A1 (fr) * 2008-08-29 2010-03-04 Wuester Heinrich Composteur
WO2014064338A1 (fr) 2012-10-24 2014-05-01 Ecolution Oy Procédé et système pour le traitement de déchets organiques
EP2805932A1 (fr) * 2013-05-22 2014-11-26 Grace Organic AB Système de compostage de déchets organiques et procédé de compostage de déchets organiques
WO2014187778A1 (fr) * 2013-05-22 2014-11-27 Grace Organic Ab Composteur de déchets organiques et procédé de compostage de matières-déchets organiques
CN112110624A (zh) * 2020-10-16 2020-12-22 台州瑟知科技有限公司 一种间隔进行搅拌并自动控制排料的污泥发酵装置

Also Published As

Publication number Publication date
GB0006650D0 (en) 2000-05-10
GB2344584B (en) 2001-01-10
AU9173798A (en) 1999-04-23
GB9720750D0 (en) 1997-12-03
GB2344584A (en) 2000-06-14

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