WO2000052405A1 - A method and a plant for hygienizing and drying organic waste - Google Patents
A method and a plant for hygienizing and drying organic waste Download PDFInfo
- Publication number
- WO2000052405A1 WO2000052405A1 PCT/SE2000/000367 SE0000367W WO0052405A1 WO 2000052405 A1 WO2000052405 A1 WO 2000052405A1 SE 0000367 W SE0000367 W SE 0000367W WO 0052405 A1 WO0052405 A1 WO 0052405A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sanitising
- drying
- pressure
- temperature
- container
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/80—Apparatus for specific applications
- H05B6/806—Apparatus for specific applications for laboratory use
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/08—Radiation
- A61L2/12—Microwaves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/12—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices
- F26B11/14—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices the stirring device moving in a horizontal or slightly-inclined plane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/048—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum in combination with heat developed by electro-magnetic means, e.g. microwave energy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/6408—Supports or covers specially adapted for use in microwave heating apparatus
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/04—Heating using microwaves
- H05B2206/045—Microwave disinfection, sterilization, destruction of waste...
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/04—Heating using microwaves
- H05B2206/046—Microwave drying of wood, ink, food, ceramic, sintering of ceramic, clothes, hair
Definitions
- the present invention relates to a method and to plant for sanitising and drying organic material in accordance with the preamble of the accompany independent method and independent apparatus Claims respectively.
- the organic material to be dried includes a valuable heat-sensitive constituent, such as fish residues for instance that contain valuable fats and oils which are destroyed at temperature above about +40°C, it is known to dry the material at a relatively low temperature below the destruction temperature of said valuable constituent, therewith enabling such constituents to be won from the dried material.
- a valuable heat-sensitive constituent such as fish residues for instance that contain valuable fats and oils which are destroyed at temperature above about +40°C
- the material to be dried is an organic waste material with which there is the risk of dangerous quantities of harmful micro-organisms developing in the dried material within a relatively short space of time, it is also necessary to sanitise the material. Because it will not normally suffice to dry the material to a given degree of dryness, the material must also be subjected to a prescribed sanitising process.
- the regulations concerning such sanitation can
- One example of such prescribed sanitation that has low temperature requirements involves maintaining the material at a temperature of at least +70°C over a time period of at least one hour. However, the requirement may often involve a much higher temperature.
- the invention can be applied to enable organic waste material, such as food residues or rests, meat rests and fish rests, to be stored over a longer period of time without need of refrigeration. This facilitates transportation of the dried material and enables the use or dumping of said material to be delayed.
- Such dried and sanitised material can be used as soil improving agents or similar agents.
- Other materials that do not pass directly to a recipient can be used to generate biogas in digester gas plants. In this latter case, however, such waste material, including sewage sludge and the like, cannot be transported easily to and stored in a biogas plant.
- the object of the present invention is to provide an effective technique for both sanitising and drying organic material, particularly organic waste material, in which the material is preferably at least partially heated with the use of microwaves, both during the drying and the sanitation process.
- This object includes the provision of a process in which the process steps are carried out in a manner such as to minimise energy and time consumption in the process and to enhance process safety.
- the material is first sanitised by maintaining said material at or above a predetermined relatively high temperature over a predetermined period of time in accordance with sanitary regulations.
- water vapour extracted from the material may conveniently be removed from a chamber in which the material is contained during sanitation, wherewith the water vapour is normally condensed by cooling and collected as condensate in a condensate container.
- the material is dried after being sanitised.
- the material is heated by microwaves at least to a substantial extent during both sanitation and drying of the material.
- the sanitised material is dried preferably at a sub-atmospheric chamber pressure, at least in the final stage of the drying process. Since the material has been kept at a high temperature over a long period of time, the properties of the material cannot be impaired by continuing the drying process at a temperature in the region of the sanitising temperature, and consequently there is, in principle, no reasons to effect the drying process at a temperature below the sanitising temperature. However, we have still found it suitable to lower the pressure in the material treatment chamber during the drying process, and therewith also lower the chamber temperature.
- a hot particle can be created by, for instance, a flake of aluminium foil that is heated to a very high temperature by microwave energy.
- the moisture content of the material will be so low at the end of a drying operation as to prevent said foil flake from being cooled sufficiently by the surrounding material and the flake will thus constitute a high ignition risk.
- the process may conveniently include the step of rapidly lowering the chamber pressure during the process, so as to facilitate the departure of moisture from the material.
- the material When sanitising moisture-containing material, it may be desirable to maintain the material at a temperature higher than 100°C. This can be readily achieved, by maintaining the chamber at a corresponding elevated pressure at which water will boil at the desired temperature level. When the material is maintained at an elevated pressure, the pressure within the cells of the organic material will also increase. When the pressure is lowered to atmospheric pressure, or to a sub- atmospheric drying pressure, there is an increased probability that the cell walls will burst, thereby facilitating the drying pressure by virtue of the fact that water is able to depart from the interior of the cells more easily. This bursting effect can be enhanced by rapidly lowering the pressure.
- Heat can be more favourably spread throughout the material in the sanitising chamber/drying chamber by using an agitator or stirring device that moves within the chamber.
- This agitator or stirring device may be adapted to deliver heat to the material as it agitates said material, through the medium of heat exchange in a known manner.
- the agitator or stirring device may be comprised of material that will be heated by the microwaves and then transfer heat to the organic material upon contact therewith.
- the drying chamber may suitably be comprised of a material that is transparent to microwaves, such as polyethylene, and magnetrons that include waveguides may be placed outside the drying/sanitising chamber.
- Fig. 1 is a schematic illustration of plant for carrying the inventive method.
- Fig. 2 illustrates part of one variant of the plant.
- the illustrated plant includes a microwave transparent container 1 , which has a bottom opening 4 and which can be closed by means of a lid or cover 5.
- An agitator or stirring device 6 is mounted in the container 1.
- a number of magnetrons that include waveguides are disposed around the container 1.
- the illustrated plant includes an infeed container 8 which has a bottom opening 9 and a material disintegrating device 10 accommodated in the lower part of said container.
- the container 8 can be moved between a rest position in which it is distanced from the filling opening of the container 1 to a working position in which the outlet opening of the infeed container 8 is located above the opening 2 , with the lid 3 opened, wherewith the opening 9 of the infeed container is located in the proximity of the opening 2.
- Material fed into the container 8, for instance through its upper open end, is disintegrated by the disintegrating device 10 and fed into the container 1 with openings 9, 10 in register with one another.
- the upper part of the container 1 is connected by a conduit 11 to a condenser 12 which, in turn, is connected to a condensation tank by means of a conduit 13.
- the closed container 1, the conduit 11, the condenser 12, the conduit 13 and the condensation tank 14 together form a closed system.
- the upper part of the condensation tank 14 is connected to a pump 15, which is used to generate an overpressure or a subpressure in the system.
- the condenser may be cooled with ambient air with the aid of a blower 20 or some similar device.
- the condensation water tank may include a bleed pipe and associated shut-off valve connected thereto.
- a space into which and from which an upwardly open vessel 30 can be moved is provided beneath the container bottom 5.
- Material treated in the container 1 can be emptied into the vessel 30, by opening the bottom cover 5.
- the cover 5 may conveniently be displaceable in its own plane, so as to expose the bottom opening 4.
- Waste prepared food products, or delicatessen, can be sanitised and dried in the following manner.
- Waste delicatessen is placed in the infeed container 8 and the container then moved until its bottom opening 9 is located immediately above the exposed filling opening 2 of the container 1.
- the waste disintegrating device is then activated and the disintegrated waste falls down into the container 1.
- the infeed container 8 is then moved to one side and the cover 3 closed.
- the agitating or stirring device is then activated, as are also the magnetrons 19.
- the pump 15 is activated so as to establish in the container 1 a pressure that exceeds atmospheric pressure, wherewith the boiling point of the water rises to a prescribed sanitation temperature above 103°C. Sanitising heat can then be maintained over the recommended time period. Normally, higher temperatures are required for shorter processing times.
- the material may be maintained at a prescribed temperature, for instance a temperature of 70°C or higher, over a prescribed period of time, for instance over an hour.
- a prescribed temperature for instance a temperature of 70°C or higher
- the chosen temperature limit is facilitated and ensured during this time period, by being able to supply heat to a relatively large extent at the same time as the temperature becomes generally self-regulating and constant in correspondence with the set pump pressure, at least for as long as the material still contains substantial amounts of water.
- the pump 15 is switched to a mode in which a sub-atmospheric pressure is established in the system 1, 11, 12, 13, 14.
- the temperature is preferably lowered relatively quickly, so as to cause the cell walls of the material sanitised in the container 1 to burst to the greatest possible extent.
- the material is then dried at a temperature corresponding to the boiling point of the water at the set pressure, for instance 50°C.
- the material can be kept at this temperature for as long as a significant amount of water remains in the material. Because the material has a temperature in the order of 50°C, it is still able to cool down hot particles, for instance hot flakes of aluminium foil. These particles would otherwise be heated by the microwaves to such an extent as to be capable of igniting the material when it has a relatively low moisture content.
- the drying process is stopped when the moisture content of the dried material has reached a predetermined threshold level, which can be detected conventionally.
- At least the final stage of the drying process is continued at the lowest possible pressure, for instance at a pressure that corresponds to a water boiling point of 50°C.
- the energy supply (the microwave effect) is switched-off when the material is judged to have reached the predetermined moisture threshold, although stirring or agitation of the material is continued for a further two minutes .
- Tests have shown that effective cooling of dangerously hot areas in the material (e.g. capsules, aluminium flakes and the like) can be achieved in this way with a surprisingly high degree of safety, so as to effectively minimise the risk of ignition.
- the material can be dumped.
- An addition of the aforesaid absorbent substance will also prevent sticky sugar residues from fastening to the various surfaces of the treatment vessel.
- the aforesaid absorbent substance may be added conveniently at the beginning of the drying process.
- the plant may conveniently be housed in an enclosure that is kept at a slight subpressure relative to atmospheric pressure, wherewith the enclosure atmosphere is driven or recycled through an aroma filter, for instance through a filter comprised of active carbon or some similar substance, so as to minimise the risk of contaminating the surroundings with less attractive odours.
- the stirring device/disintegrator in the vessel 1 was comprised of stainless steel (for instance austenitic or ferritic steel), this applying particularly to the wings of the stirring device. It has been found that the stirring device is not heated to the same high temperature that was feared during operation with microwaves, and that the wings effectively transfer sensible heat to the material.
- stainless steel for instance austenitic or ferritic steel
- a manually manageable nozzle 71 which communicates with a particle separator 8 preferably through the medium of a flexible hose 72, said particle separator 8 being in communication with a suction fan 79, as illustrated in Fig. 2.
- the separator 8 is able to collect the particles in a bag or sack 77 which can be removed when full and replaced with an empty bag.
- the separator 8 may include to this end a removable lid 74 and a perforated bag holder 75, 76 which functions to hold the bag 77 spaced from the separator vessel 73.
- An evacuation line 78 connects the air outlet chamber of the separator 8 to the suction fan 79.
- the separator 8 may include a cyclone separator of known design.
- the shaft 62 of the stirrer 6 may extend into the container 1 via its bottom and the lower end of said shaft 62 may be coupled to a drive motor 61, either directly or indirectly.
- a drive motor 61 either directly or indirectly.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU35787/00A AU3578700A (en) | 1999-03-01 | 2000-02-25 | A method and a plant for hygienizing and drying organic waste |
EP00914404A EP1157250A1 (en) | 1999-03-01 | 2000-02-25 | A method and a plant for hygienizing and drying organic waste |
NO20014005A NO20014005L (en) | 1999-03-01 | 2001-08-16 | Process and plant for the hygiene and drying of organic waste |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9900723A SE518999C2 (en) | 1999-03-01 | 1999-03-01 | Procedure for hygienizing and drying organic material |
SE9900723-9 | 1999-03-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000052405A1 true WO2000052405A1 (en) | 2000-09-08 |
Family
ID=20414673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2000/000367 WO2000052405A1 (en) | 1999-03-01 | 2000-02-25 | A method and a plant for hygienizing and drying organic waste |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1157250A1 (en) |
AU (1) | AU3578700A (en) |
NO (1) | NO20014005L (en) |
SE (1) | SE518999C2 (en) |
WO (1) | WO2000052405A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1847791A1 (en) * | 2006-04-21 | 2007-10-24 | Bearn Innovation | Method of drying sludge and apparatus for carrying out the method |
WO2008056970A2 (en) * | 2006-11-10 | 2008-05-15 | Yuan Chin Liew | Apparatus for treating organic waste |
WO2008089931A1 (en) * | 2007-01-25 | 2008-07-31 | Inotec Gmbh Co. Holding Und Handels-Kg | Installation for drying organic matter |
WO2008126114A1 (en) * | 2007-04-13 | 2008-10-23 | Tecnoimpianti Srl | Plant and process for transformation of organic material |
WO2015181769A1 (en) * | 2014-05-29 | 2015-12-03 | Biotech S.R.L. | Method for transforming waste and system for performing said method |
WO2016012986A1 (en) * | 2014-07-24 | 2016-01-28 | Fasthum S.R.L. | A plant and process for fast humification and biostabilization and product obtained therefrom |
WO2017178212A1 (en) * | 2016-04-12 | 2017-10-19 | Cebcon Technologies Gmbh | Method for sanitizing biomass |
JP7459434B2 (en) | 2018-11-02 | 2024-04-02 | スプレイング システムズ カンパニー | Electrostatic Spray Dryer System |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4103431A (en) * | 1975-04-28 | 1978-08-01 | Levinson Melvin L | Microwave drying |
US4896434A (en) * | 1988-11-10 | 1990-01-30 | Joseph Fanelli | Apparatus and method for drying gel |
EP0408946A2 (en) * | 1989-07-19 | 1991-01-23 | Kurt Satow | Method and apparatus for sterilising, disinfecting and/or drying |
US5552112A (en) * | 1995-01-26 | 1996-09-03 | Quiclave, Llc | Method and system for sterilizing medical instruments |
-
1999
- 1999-03-01 SE SE9900723A patent/SE518999C2/en not_active IP Right Cessation
-
2000
- 2000-02-25 WO PCT/SE2000/000367 patent/WO2000052405A1/en not_active Application Discontinuation
- 2000-02-25 AU AU35787/00A patent/AU3578700A/en not_active Abandoned
- 2000-02-25 EP EP00914404A patent/EP1157250A1/en not_active Withdrawn
-
2001
- 2001-08-16 NO NO20014005A patent/NO20014005L/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4103431A (en) * | 1975-04-28 | 1978-08-01 | Levinson Melvin L | Microwave drying |
US4896434A (en) * | 1988-11-10 | 1990-01-30 | Joseph Fanelli | Apparatus and method for drying gel |
EP0408946A2 (en) * | 1989-07-19 | 1991-01-23 | Kurt Satow | Method and apparatus for sterilising, disinfecting and/or drying |
US5552112A (en) * | 1995-01-26 | 1996-09-03 | Quiclave, Llc | Method and system for sterilizing medical instruments |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2007242682B2 (en) * | 2006-04-21 | 2011-12-22 | INNOTHERM-E Technologies | Method of drying sludge and device for implementing the method |
FR2900224A1 (en) * | 2006-04-21 | 2007-10-26 | Bearn Innovation Bernard Dedie | METHOD FOR DRYING SLUDGE AND DEVICE FOR IMPLEMENTING THE METHOD |
WO2007122328A1 (en) * | 2006-04-21 | 2007-11-01 | Bearn Innovation - Dedieu Bernard | Method of drying sludge and device for implementing the method |
EP1847791A1 (en) * | 2006-04-21 | 2007-10-24 | Bearn Innovation | Method of drying sludge and apparatus for carrying out the method |
WO2008056970A2 (en) * | 2006-11-10 | 2008-05-15 | Yuan Chin Liew | Apparatus for treating organic waste |
WO2008056970A3 (en) * | 2006-11-10 | 2008-07-31 | Yuan Chin Liew | Apparatus for treating organic waste |
US8561314B2 (en) | 2007-01-25 | 2013-10-22 | Inotec Gmbh Co. Holding Und Handels-Kg | Installation for drying organic matter |
JP2010516454A (en) * | 2007-01-25 | 2010-05-20 | イノテック ゲーエムベーハー&コー ホールディング ウント ハンデルス カーゲー | Organic substance drying equipment |
WO2008089931A1 (en) * | 2007-01-25 | 2008-07-31 | Inotec Gmbh Co. Holding Und Handels-Kg | Installation for drying organic matter |
WO2008126114A1 (en) * | 2007-04-13 | 2008-10-23 | Tecnoimpianti Srl | Plant and process for transformation of organic material |
WO2015181769A1 (en) * | 2014-05-29 | 2015-12-03 | Biotech S.R.L. | Method for transforming waste and system for performing said method |
WO2016012986A1 (en) * | 2014-07-24 | 2016-01-28 | Fasthum S.R.L. | A plant and process for fast humification and biostabilization and product obtained therefrom |
US10882798B2 (en) | 2014-07-24 | 2021-01-05 | Fasthum S.R.L. | Plant and process for fast humification and biostabilization and product obtained therefrom |
WO2017178212A1 (en) * | 2016-04-12 | 2017-10-19 | Cebcon Technologies Gmbh | Method for sanitizing biomass |
JP7459434B2 (en) | 2018-11-02 | 2024-04-02 | スプレイング システムズ カンパニー | Electrostatic Spray Dryer System |
Also Published As
Publication number | Publication date |
---|---|
SE9900723D0 (en) | 1999-03-01 |
SE518999C2 (en) | 2002-12-17 |
EP1157250A1 (en) | 2001-11-28 |
NO20014005L (en) | 2001-10-31 |
SE9900723L (en) | 2000-09-02 |
AU3578700A (en) | 2000-09-21 |
NO20014005D0 (en) | 2001-08-16 |
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