JP5846728B2 - Carbonization method and carbonization plant for organic waste - Google Patents

Description

  The present invention relates to a carbonization method for carbonizing organic waste such as excess sludge and a carbonization plant therefor.

  Conventionally, surplus sludge generated through an aeration process and a precipitation process in a sewage treatment plant has been subjected to final disposal such as landfill and incineration as industrial waste.

  In recent years, with increasing consideration for the global environment, soil pollution due to surplus sludge reclamation and carbon dioxide emissions into the atmosphere due to incineration of surplus sludge have become problems. In order to solve these problems, a technique for drying and carbonizing excess sludge to form a useful material that can be used as a soil conditioner or the like has been proposed. As this type of technology, a rotary kiln for drying and carbonizing excess sludge is often used, and the water content after the dehydration process is 80 wt% (mass by mass) using a single rotary furnace having a drying chamber and a carbonization chamber. A rotary kiln that continuously dries and carbonizes sludge (percentage) is proposed (for example, see Patent Document 1). In this rotary kiln, a rotary furnace provided with a drying chamber and a carbonizing chamber is heated with a burner on the outer peripheral side, the sludge is dried to a moisture content of about 20 to 40 wt%, and the dried sludge is carbonized. .

JP 2001-355967 A

  However, the sludge drying and carbonization method using the above rotary kiln is carried out by drying and carbonizing the sludge with a water content of about 80 wt% into a single rotary furnace and heating it with a burner. However, there is a problem that the fuel cost increases. In addition, when fossil fuel is used as the fuel for the burner, the amount of greenhouse gas emissions such as carbon dioxide is large, and air pollutants such as nitrogen oxides are generated, which has a relatively large impact on the environment. There is.

  Moreover, since the excess sludge discharged from the sewage treatment plant has a strong odor, the steam generated when the sludge is dried from a moisture content of about 80 wt% to a moisture content of about 20 to 40 wt% contains a large amount of odor. Ingredients are included, but Cited Document 1 does not consider odor treatment.

  Then, the subject of this invention is the carbonization method which can dry and carbonize organic waste with much water | moisture contents like excess sludge, while preventing the spreading | diffusion of an odor by comparatively high fuel efficiency, reducing the influence on an environment. Is to provide.

In order to solve the above problems, the method for carbonizing organic waste according to the present invention includes a reduced-pressure drying step in which organic waste is added in a microorganism and heated in a reduced-pressure environment to form a dried organic matter.
A condensation step of condensing moisture evaporated from the organic waste in the vacuum drying step;
In the condensation process, water is cooled, and the cooling water to which microorganisms are added is mixed with the condensed water produced in the condensation process and the gas containing the odor produced in the reduced pressure drying process, and the cooling water is cooled. A mixing and cooling step;
A carbonization step of heating the dry organic matter in a low oxygen environment to form an organic carbide and generating a combustible gas;
And a combustion step of burning the combustible gas generated from the dried organic matter in the carbonization step as a fuel for heating in the vacuum drying step or the carbonization step.

  According to the above configuration, in the reduced pressure drying step, the organic waste is added with microorganisms and heated in a reduced pressure environment to form a dried organic matter. Since microorganisms are added to organic waste and heated in a reduced pressure environment, even if the organic waste has a water content exceeding about 98 wt%, such as excess sludge, the odor is suppressed by the action of microorganism decomposition. At the same time, the boiling point can be lowered and drying can be performed at a relatively low heating temperature. In this way, lowering the boiling point due to reduced pressure makes it possible to lower the heating temperature for drying, so it is possible to use less fuel for heating and prevent the death of microorganisms added to organic waste. And the odor reduction effect can be stably achieved. Here, the organic waste refers to a wide range of wastes containing organic substances discharged from sewerage and sewage treatment facilities, or produced by various types of industrial production processes, wastewater treatment, or sludge treatment by the activated sludge method, for example. This includes surplus sludge, sludge accumulated on the bottom of lakes and marshes, waste discharged from the agriculture and fisheries industry, food residues discharged from food factories, and garbage discharged from ordinary households.

  Here, in the vacuum drying step, the amount of combustible gas generated from the organic waste can be suppressed by relatively reducing the heating temperature of the organic waste. By suppressing the amount of flammable gas produced in the vacuum drying step, a large amount of flammable gas can be collected in the carbonization step after the vacuum drying step. Therefore, combustible gas can be efficiently generated and collected from organic waste, and it is generated from organic waste in a combustion process in which this combustible gas is burned as fuel for heating in a vacuum drying process or carbonization process. A large amount of the combustible gas produced can be used. That is, the ratio of using the combustible gas generated in the carbonization step can be increased with respect to the fuel necessary for the heating in the vacuum drying step and the carbonization step. As a result, the fossil fuel newly used for the heating can be reduced. As a result, fuel costs can be reduced, and emissions of greenhouse gases and air pollutants associated with the use of fossil fuels can be reduced. Moreover, since the combustible gas produced | generated from organic waste is burned, the odor of organic waste can be reduced effectively.

  Moreover, the water | moisture content evaporated from the organic waste at the said decompression drying process is condensed by a condensation process. The cooling water used in this condensing step, to which the microorganisms are added, is mixed with the condensate water generated in the condensing step and the gas containing the odor generated in the depressurizing drying step. Cool this cooling water. Thereby, while cooling cooling water, the odor contained in condensed water and gas can be decomposed | disassembled by the microorganisms of cooling water and deodorized. Accordingly, it is possible to promote the drying of the organic waste in the reduced pressure drying process and to effectively prevent the diffusion of the odor caused by the drying of the organic waste.

  Thus, according to the carbonization method of organic waste of the present invention, for example, organic waste with a large amount of water and strong odor, such as excess sludge, can be efficiently and quickly produced at a relatively low fuel cost. Further, while reducing the emission amount of greenhouse gases and air pollutants, and further preventing the diffusion of odor, drying and carbonization can be performed to produce an organic carbide with less odor. The organic carbide produced by this carbonization method can be used as a fertilizer, fuel, adsorbent, soil conditioner, or reducing agent.

  In the carbonization step, the low oxygen environment means that the oxygen concentration in the atmosphere where the dry organic matter is placed is 5% or more and 12% or less by volume. Moreover, in the said carbonization process, it is preferable that the heating temperature of dry organic substance is 350 degreeC or more and 500 degrees C or less, and it is preferable that the heating time of dry organic substance is 5 minutes or more and 10 minutes or less. Depending on the conditions of oxygen concentration, heating temperature, and heating time, the dried organic material can be carbonized, and a combustible gas containing, for example, hydrogen, carbon monoxide, and methane can be generated from the dried organic material.

  The carbonization method of the organic waste according to one embodiment uses surplus heat of heating in the carbonization step for heating in the vacuum drying step.

  According to the embodiment, the combustible gas generated from the dry organic matter in the carbonization step is burned in the combustion step as a heating fuel in the carbonization step, and the excess heat of heating in the carbonization step is reduced in the vacuum drying step. By using it for heating, heat can be stably supplied to the reduced-pressure drying process that requires a larger amount of heat than the carbonization process. Moreover, the wasteful consumption of heat can be reduced as a whole organic waste carbonization method.

  The carbonization method of the organic waste according to an embodiment includes a combustion air supply step of supplying the gas generated in the vacuum drying step as combustion air for heating the organic waste in the vacuum drying step.

  According to the above embodiment, the gas generated in the reduced pressure drying step is supplied to a heat source device such as a burner as combustion air for heating the organic waste in the reduced pressure drying step, whereby the odor component of the gas is supplied. It can be burned with fuel to remove odors produced in the vacuum drying process.

The carbonization method of the organic waste according to an embodiment includes a granulation step of granulating the dry organic matter formed in the vacuum drying step before the carbonization step,
In the carbonization step, the granulated dry organic matter is heated.

  According to the said embodiment, since the dry organic substance formed at the pressure reduction drying process is granulated by a granulation process, a dry organic substance is solidified and powdery dry organic substance decreases. Therefore, in the carbonization step of heating the granulated dry organic matter, the amount of powdered dry organic matter and organic carbide discharged together with the exhaust gas is reduced. As a result, it is possible to reduce the loss that occurs during the formation of the organic carbide from the dry organic material, and to increase the yield of the organic carbide. In addition, since the powder discharged together with the exhaust in the carbonization step can be reduced, the dust collector that collects the powder from the exhaust can be reduced in size, and the maintenance of the dust collector can be reduced. As a result, it is possible to reduce costs and labor related to dust collection in the carbonization process.

  In addition, granulation of dry organic substance means forming the dry organic substance formed in the reduced pressure drying step into solid particles of 2 mm or more and 8 mm or less. Granulation can be performed by a granulator such as a so-called pellet mill.

  In one embodiment of the method for carbonizing an organic waste, a wood material powder is added in advance to the organic waste to be treated in the vacuum drying step.

  According to the said embodiment, the ratio of the water | moisture content of the process target in a reduced pressure drying process can be reduced by adding the powder of a woody material to organic waste, and the production | generation efficiency of dry organic matter can be improved. Here, sawdust made by pulverizing waste wood, thinned wood, or the like can be used as the powder of the wooden material.

The organic waste carbonization plant of the present invention is a reduced-pressure drying apparatus that heats an organic waste to which microorganisms are added in a reduced-pressure environment to form a dried organic matter,
A carbonization device that heats the dried organic matter in a low oxygen environment to form an organic carbide and generate a combustible gas;
The reduced-pressure drying apparatus includes a casing in which organic waste is introduced and decompresses the inside, a stirring unit that is rotatably disposed in the casing and stirs the organic waste, and is disposed in at least a part of the casing for organic waste. A heating unit that heats the product, a condensing unit that condenses the vapor from the organic waste, cooling water supplied to the condensing unit to which microorganisms are added, condensed water generated in the condensing unit, and the organic A suction pump for sucking a gas containing odor generated by drying waste from the casing, and a mixing cooler for mixing the cooling water with the condensed water sucked by the suction pump and the gas and cooling the cooling water And
For heating at least one of the reduced-pressure drying apparatus and the carbonization apparatus, a combustible gas generated from a dried organic substance in the carbonization apparatus is used as a fuel.

  According to the said structure, the organic waste to which microorganisms were added is heated by a reduced pressure drying apparatus in a reduced pressure environment, and a dry organic matter is formed. That is, organic waste is put into a casing whose inside is decompressed, and this organic waste is heated by the heating unit and stirred by the stirring unit. Since microorganisms are added to organic waste and heated in a reduced pressure environment, even if the organic waste has a water content exceeding about 98 wt%, such as excess sludge, odor is generated due to the decomposition of microorganisms. In addition to being suppressed, the boiling point is lowered and drying is performed at a relatively low heating temperature. As described above, since the heating temperature by the heating unit can be relatively lowered due to the decrease in boiling point due to the reduced pressure, the fuel used for the heat source device of the heating unit can be relatively reduced and the microorganisms added to the organic waste can be killed. This can be prevented, and the effect of reducing odor can be stably achieved. Here, organic waste refers to a wide variety of industrial production processes, wastewater treatment, or waste that is discharged from urban infrastructure and contains organic matter. For example, excess sludge generated by sludge treatment by the activated sludge method This includes sludge deposited on the bottom of lakes and seas, waste discharged from the agriculture and fisheries industry, food residues discharged from food factories, and garbage discharged from ordinary households.

  The said reduced pressure drying apparatus can suppress the production amount of the combustible gas from the said organic waste by setting the heating temperature of the organic waste by a heating part comparatively low. By suppressing the amount of flammable gas produced during the treatment by the reduced pressure drying apparatus, a large amount of flammable gas can be collected when the dry organic matter is treated by the carbonization apparatus. Therefore, it is possible to efficiently generate and collect combustible gas from organic waste. When this combustible gas is burned as fuel for heating a vacuum drying apparatus or as fuel for heating a carbonization apparatus, In addition, a large amount of combustible gas generated from organic waste can be used. That is, it is possible to increase the ratio of using the combustible gas generated in the carbonization apparatus with respect to the fuel necessary for heating the vacuum drying apparatus and the carbonization apparatus. As a result, it is possible to reduce the fossil fuel newly used for heating the vacuum drying apparatus and the carbonization apparatus. As a result, fuel costs can be reduced, greenhouse gas emissions can be reduced, and generation of nitrogen oxides can be prevented. Moreover, since the combustible gas produced | generated from organic waste is burned, the odor of organic waste can be reduced effectively.

  Moreover, in the said reduced pressure drying apparatus, the water | moisture content evaporated from the organic waste is condensed in a condensation part. The condensed water sucked by the suction pump and the gas in the casing are mixed and cooled by the mixing cooler to the cooling water supplied to the condensing unit and added with microorganisms. Thereby, while cooling water, it can decompose and deodorize condensed water and gaseous odor with the microorganisms of cooling water. Therefore, drying of organic waste can be promoted, and odor diffusion that occurs with drying of organic waste can be effectively prevented.

  Thus, according to the organic waste carbonization plant of the present invention, organic waste with a high water content and strong odor, such as excess sludge, can be efficiently and quickly dried, and the amount of fuel consumed is relatively small. Can carbonize while suppressing the generation of greenhouse gases such as carbon dioxide and the generation of air pollutants such as nitrogen oxides, while also preventing the spread of odors during processing by the vacuum dryer and carbonizer Organic carbides with less odor can be formed.

  In the carbonization process by the carbonization apparatus, the low oxygen environment means that the oxygen concentration in the atmosphere in which the dry organic matter is placed is 5% or more and 12% or less by volume. In the carbonization step using the carbonization apparatus, the heating temperature of the dried organic material is preferably 350 ° C. or more and 500 ° C. or less, and the heating time of the dried organic material is preferably 5 minutes or more and 10 minutes or less. Depending on the conditions of oxygen concentration, heating temperature, and heating time, the dried organic material can be carbonized, and a combustible gas containing, for example, hydrogen, carbon monoxide, and methane can be generated from the dried organic material.

  The carbonization plant for organic waste according to one embodiment supplies and uses the excess heat when heating the dry organic matter in the carbonization apparatus to the heating unit of the vacuum drying apparatus.

  According to the above-described embodiment, the combustible gas generated from the dry organic matter in the carbonization device is burned as a fuel for heating the dry organic matter in the carbonization device, and excess heat generated when the carbonization device is heated is reduced in pressure. Supplying heat to the heating unit of the drying device to supply heat stably to the vacuum drying device for drying organic waste that requires more heat than carbonizing dry organic matter. Can do. Moreover, wasteful consumption of heat can be reduced as a whole of the organic waste carbonization plant.

  The carbonization plant for organic waste according to one embodiment sucks the gas in the casing of the vacuum drying apparatus, and supplies the suctioned gas as combustion air to the heat source apparatus for heating the vacuum drying apparatus. A suction pump is provided.

  According to the above embodiment, the gas generated in the reduced pressure drying apparatus is supplied as combustion air to the heat source device for heating of the reduced pressure drying apparatus by the second suction pump, whereby the odor component of the gas is combusted together with the fuel. Thus, the odor generated in the vacuum drying apparatus can be removed.

  The carbonization plant for organic waste according to one embodiment includes a granulating device that is formed by the vacuum drying device and granulates the dried organic material before being charged into the carbonizing device.

  According to the said embodiment, since the dry organic substance formed with the reduced pressure drying apparatus is granulated with a granulation apparatus, dry organic substance is solidified and powdery dry organic substance decreases. Therefore, when the granulated dry organic matter is heated by the carbonization apparatus, the amount of powdered dry organic matter and organic carbide discharged together with the exhaust gas is reduced. As a result, it is possible to reduce the loss that occurs during the formation of the organic carbide from the dry organic material, and to increase the yield of the organic carbide. In addition, since the powder discharged from the carbonization device together with the exhaust gas is small, the dust collector that collects and removes the powder from the exhaust gas can be reduced in size, and the maintenance of the dust collector can be reduced. As a result, it is possible to reduce costs and labor related to dust collection of exhaust gas from the carbonizer.

  In addition, granulation of a dry organic substance means forming the dry organic substance formed with the reduced pressure drying apparatus into the solid particle | grains of 2 mm or more and 8 mm or less. For example, a granulator such as a pellet mill can be used as the granulating device.

It is a schematic diagram which shows the carbonization plant of organic waste. It is a schematic diagram which shows the structure of a reduced pressure fermentation drying apparatus. It is a longitudinal cross-sectional view which shows the inside of the casing of a reduced pressure fermentation drying apparatus. It is a schematic diagram which shows a mixing cooler. It is a schematic diagram which shows the principal part of a ring die type granulator. It is a schematic cross section which shows a carbonization apparatus.

  Hereinafter, an embodiment of an organic waste carbonization plant of the present invention will be described in detail with reference to the accompanying drawings.

  The carbonization plant for organic waste according to the present invention is a plant for processing organic waste to produce organic carbide, and is a carbonization plant suitable for high-moisture organic waste having a water content of 80 wt% or more. The organic waste carbonization plant 1 of the present embodiment shown in FIG. 1 ferments and dries excess sludge having a water content exceeding 98 wt% in a reduced pressure environment to produce dry organic matter having a water content of approximately 30 wt% or less. The dry organic matter is carbonized to form an organic carbide. This organic waste carbonization plant 1 includes a surplus sludge receiving hopper 2, a reduced-pressure fermentation drying device 3 as a reduced-pressure drying device, a ring-die granulator 4 as a granulating device for granulating the dried organic matter, It is mainly constituted by a carbonization device 5 that performs carbonization treatment of the dry organic matter.

  The receiving hopper 2 is a device that receives surplus sludge discharged from the sewage treatment plant and transported by a tank lorry or the like, and discharges a predetermined amount of the received surplus sludge from the lower cutting device onto the transport conveyor 11. ing.

  Oga powder is added to the excess sludge transported by the transport conveyor 11 by a wood chip feeder 12 installed in the middle of the transport conveyor 11. The sawdust supply device 12 is supplied with sawdust formed by crushing woody waste such as thinned wood and building waste. In addition, it is not necessary to add the sawdust to the excess sludge. The surplus sludge to which the sawdust is added is sent to the reduced-pressure fermentation drying apparatus 3.

  FIG. 2 is a diagram showing the reduced-pressure fermentation drying apparatus 3. The reduced-pressure fermentation drying apparatus 3 is generally composed of a drying apparatus main body 31, a cooling tower 32 as a mixing cooler, and a steam boiler 33.

  The drying apparatus main body 31 includes a substantially cylindrical casing 312 having a processing chamber 311 therein, a jacket-type heater 313 formed on the lower wall surface of the processing chamber 311, and a heating and stirring unit 314 disposed in the processing chamber 311. And a condensing part 315 provided at the upper part in the processing chamber 311.

  An input port 312 a into which the object to be processed is input is formed at the upper part of one end of the casing 312, and a discharge port 312 b through which the object to be processed is discharged is formed at the lower part of the other end of the casing 312. An air lock mechanism connected to the terminal end of the transfer conveyor 11 is connected to the charging port 312 a of the casing 312. A discharge conveyor 13 formed by a screw conveyor is connected to the discharge port 312 b of the casing 312. The terminal end of the discharge conveyor 13 is connected to a discharge device having an air lock mechanism.

  FIG. 3 is a cross-sectional view showing details of the inside of the drying apparatus main body 31. As shown in FIG. 3, the heating and agitating unit 314 includes a rotating shaft 141 supported at both ends by bearing devices 121 and 122 provided at both end surfaces of the casing 312, and a coiled tube 142 fixed to the rotating shaft 141. And a plurality of rectangular blades 143 which are arranged on the outer peripheral side of the coiled tubular body 142 and have a side of 5 to 10 cm. The rotating shaft 141 and the coiled tubular body 142 communicate with each other, and steam as a heat medium is supplied into the rotating shaft 141 and the coiled tubular body 142 via the bearing devices 121 and 122. The heating and agitating unit 314 is driven to rotate by the motor M, heats the object to be processed by the rotating shaft 141 and the coiled tube 142, and sends the object to be processed in the casing 312 from the inlet 312a toward the outlet 312b. It is formed to stir while applying. The surface of the blade 143 is such that the radial leading edge of the heating and agitating unit 314 is inclined in the rotational direction, and the side edge on the discharge port 312b side in the axial direction is inclined in the counter-rotating direction. As a result, as the heating and stirring unit 314 rotates, the blade 143 scrapes the object to be processed in the vicinity of the inner surface of the casing 312. The rotation speed of the heating and stirring unit 314 can be set between 1 rpm and 60 rpm according to the amount of water in the organic waste put into the processing chamber 311.

  The bearing devices 121 and 122 of the casing 312 support the rotating shaft 141 of the heating and agitating unit 314 and supply and discharge steam as a heat medium. The supply-side bearing device 121 includes a rotary joint 124 connected to the steam supply pipe 123 and a sleeve bearing 125 that supports the end of the rotary shaft 141 that includes the steam pipe 141 a connected via the rotary joint 124. The discharge-side bearing device 122 includes a rotary joint 127 connected to the steam discharge pipe 126 and a sleeve bearing 128 that supports the end of the rotary shaft 141 that includes the steam pipe 141 b connected via the rotary joint 127. Steam supplied from the steam boiler 33 to the supply-side bearing device 121 through the steam supply pipe 123 is supplied to the rotary shaft 141 via the rotary joint 124. A part of the steam supplied to the rotating shaft 141 is supplied to the coiled tube 142. The steam supplied to the rotating shaft 141 and the coiled tube 142 undergoes heat exchange with the object to be contacted by the rotating shaft 141 and the coiled tube 142, and then is discharged through the steam tube 141 b and the rotating joint 127. Return to the side of the device 122. The steam that has returned to the discharge-side bearing device 122 is returned to the steam boiler 33 through the steam discharge pipe 126. On the other hand, steam having a lower pressure and temperature than the steam supplied to the heating and agitating unit 314 is supplied to the jacket heater 313 through the supply port 143a and returned to the steam boiler 33 through the discharge port 143b. That is, by supplying steam having a higher pressure and temperature to the heating and stirring unit 314 having a larger contact area than the jacket type heater 313 as compared with the steam supplied to the jacket type heater 313, The treated product is efficiently dried. Thus, the jacket type heater 313 and the heating stirring unit 314 function as the heating unit of the reduced-pressure fermentation drying apparatus 3.

  The coiled tubular body 142 of the heating and stirring unit 314 is formed by an upstream coil 144 and a downstream coil 145. The inside of the rotating shaft 141 is in communication with the upstream end 144a and the downstream end 144b of the upstream coil 144 and the upstream end 145a and the downstream end 145b of the downstream coil 145 in sequence. Thereby, the steam supplied to the supply-side bearing device 121 side flows into the upstream coil 144 as indicated by the arrow G1, and then returns to the inside of the rotating shaft 141 as indicated by the arrow G2, It flows into the downstream coil 145 as indicated by an arrow G3, and then returns to the inside of the rotating shaft 141 as indicated by an arrow G4. The steam in the rotating shaft 141 is discharged from the rotating shaft 141 through the steam pipe 141b as indicated by an arrow G5.

  The heating and stirring unit 314 can scrape the object to be processed in the vicinity of the inner surface of the casing 312 with the blade 143 provided on the outer peripheral side of the coiled tubular body 142. Therefore, it is possible to effectively prevent the problem that the workpiece is fixed to the inner surface of the casing 312 where the jacket type heater 313 is formed.

  The condensing unit 315 provided in the upper part in the casing 312 has a cooling water supply chamber 151 formed on the other end surface of the casing 312 and a cooling water discharge chamber 152 formed on one end surface of the casing 312. A cooling water supply pipe 153 to which cooling water is supplied from the cooling tower 32 is connected to the cooling water supply chamber 151. A cooling water discharge pipe 154 that discharges the cooling water and returns it to the cooling tower 40 is connected to the cooling water discharge chamber 152. A plurality of cooling water pipes 155, 155,... Extending between the cooling water supply chamber 151 and the cooling water discharge chamber 152 in the axial direction of the casing 312 and communicating at both ends with the supply chamber 151 and the discharge chamber 152.・ ・ Is provided. The plurality of cooling water pipes 155, 155,... Are arranged on both sides in the upper width direction of the casing 312. A water collecting trough 156 for collecting condensed water is provided on the side and the lower side of the plurality of cooling water pipes 155, 155,. A suction pipe 157 that sucks air in the processing chamber 311 together with condensed water communicates with the inside of the water collecting tank 156.

  Microorganisms are added to the organic waste dropped in the casing 312 of the drying apparatus main body 31. As microorganisms, indigenous or fermentative bacteria that inhabit the natural world such as the sea, mountains, and land are collected and cultured. In particular, in order to ferment organic sludge such as excess sludge and perform deodorization, it has been found that various animals and plants and bacteria that inhabit soil are effective. Examples of plants and animals inhabited by fungi include wormwood, wild grass, medicinal herbs, seaside grass, bamboo shoots, bamboo bush soil, mountain forest soil, fish, seaweed, fruits, pineapples, apples, mandarin oranges, loquats and grapes. It is preferable to use the bacteria that inhabit them by culturing with rice bran or sawdust. In this embodiment, the fermenting bacteria are mixed while stirring the workpiece at a temperature of 70 to 90 ° C. for 30 minutes to 2 to 3 hours under a reduced pressure environment of 0.03 to 0.07 MPa. Since deodorization is performed, microorganisms that grow under such conditions are preferred. The microorganism added to the processing chamber 311 is preferably one that produces at least one of the following enzymes. In addition, the substance which each enzyme acts is described in the parenthesis following each enzyme. Alcohol dehydrogenase (alcohol), lactate dehydrogenase (lactose), glucose 6-phosphate dehydrogenase (carbohydrate), aldehyde dehydrogenase (aldehyde), L, aspartate, beta-semialdehyde, NADP Oxdrectase (aldehyde), glutamate dehydrogenase (amino acid), aspartate semialdehyde dehydrogenase (amino acid), NADPH2 cyclochrome C-reactase (NADP), glutathione dehydrogenase (glutathione), Trehalose phosphate synthetase (carbohydrate), polyphosphae kinase (ATP), ethanolamine phosphae cytidyltransferase (CTP), trehalose phosphatase (carbohydrate), metal O-phospho-glycerate phosphatase (glycerin), inulase (inulin), β-mannositase (carbohydrate), uridine nucleositase (amino acid), cytosine diaminase (cytosine), methylcysteine synthetase (amino acid), aspartate synthetase (ATP) ), Succinate dehydrogenase (succinic acid), aconitic acid hydrogenase (citrate), fumarate hydrogenase (malonic acid), maleate dehydrogenase (malonic acid), citrate synthetase (acetyl CouA) , Isocitrate dehydrogenase (citrate), LSNADP oxidase (citrate), monoamine oxidase (amine), histamine (amine), pyruvate decarboxylase (oxoacid), ATPase (ATP), nucleotide pyrophosphatase (nucleic acid), endopolyphosphatase (ATP), ATP phosphohydrolase (ATP), orotidine 5-phosphate decarboxylase (orotidine). By including a microorganism that produces at least one of these enzymes in the object to be treated, it is possible to effectively decompose organic waste composed of many kinds of organic substances.

  The cooling tower 32 cools the cooling water supplied to the condensing unit 315 of the drying device main body 31, and cools the condensed water generated by the condensing unit 315 of the drying device main body 31 and the gas in the drying device main body 31. Deodorizing by mixing with water. The cooling water is guided from the cooling water discharge chamber 152 in the drying apparatus main body 31 to the cooling tower 32 as indicated by an arrow W1 in FIG. 2, and after being cooled, the cooling water is indicated by an arrow W2 in FIG. Thus, the cooling water supply chamber 151 of the drying apparatus main body 31 is returned. Moreover, the condensed water produced | generated by the condensation part 315 of the drying apparatus main body 31 and the gas which has the odor produced in the processing chamber 311 with the drying of organic waste are attracted | sucked by the vacuum pump VP, and the arrow of FIG. As indicated by V, it is guided to the cooling tower 32.

  As shown in FIG. 4, the cooling tower 32 includes a casing 321 having an air circulation port at the top and bottom, a water tank 322 installed at the lower end of the casing 321, and guides the water in the water tank 322 to the top in the casing 321. The water spray pipe 323, the water spray pump SP interposed in the water spray pipe 323, a plurality of water spray nozzles 323a, 323a,... A contact body 325 in which water flows down and contacts, and a fan 326 provided at the upper end of the casing 321 are provided. The casing 321 is provided with a conduit 324 that guides the condensed water and air discharged from the drying apparatus main body 31 as indicated by an arrow V in FIG. A plurality of discharge nozzles 324a, 324a,... Are provided at the branched tip of the conduit 324 so that the condensed water and gas guided by the conduit 324 are discharged toward the flow of water discharged from the watering nozzle 323a.・ ・ Is provided. The contact body 325 is provided with a porous filler made of resin and serves as a carrier for microorganisms. A cooling water pipe 327 for returning the cooling water in the water tank 322 to the drying device main body 31 is connected to the water tank 322, and the cooling water is circulated between the cooling tower 32 and the condensing unit 315 in the cooling water pipe 327. A cooling water pump P is interposed.

  Microorganisms are added to the cooling water circulating between the cooling tower 32 and the condensing unit 315. This microorganism is obtained by collecting and cultivating indigenous bacteria, fermenting bacteria, and the like that inhabit the natural world such as the sea, mountains, and land, in the same manner as the microorganisms introduced into the processing chamber 311. The microorganism added to the cooling water may be a microorganism that produces at least one enzyme among a plurality of enzymes produced by the microorganism added to the processing chamber 311 described above. By adding microorganisms to the cooling water, the odor component contained in the condensed water and the odor component contained in the gas sucked from the processing chamber 311 can be decomposed and removed. The decomposition of odor components by microorganisms is performed while the cooling water circulates in a circulation path formed between the cooling tower 32 and the condensing unit 315. Further, when the cooling water comes into contact with the contact body 325 and flows down, the odor is decomposed by the microorganisms supported on the contact body 325.

  The reduced-pressure fermentation drying apparatus 3 reduces the concentration of odorous components as a whole by mixing condensed water and gas with cooling water, so that the processing capacity of microorganisms may be exceeded even if condensed water or gaseous odorous components increase. Therefore, the decomposition process with stable odor can be performed. Further, since the inside of the processing chamber 311 is depressurized, the temperature rise of the cooling water when the cooling water exchanges heat with room air in the condensing unit 315 is relatively small, and the temperature of the cooling water is approximately 40 to 45 ° C. become. Thereby, the disadvantage that the microorganisms in the cooling water are killed by the high temperature is prevented, the microorganisms are stably activated, and the condensed water and gas can be stably deodorized by the microorganisms.

  Further, in the cooling tower 32, the evaporation of the cooling water is promoted, so that almost no overflow occurs. Moreover, since condensed water and gaseous odor components are diluted with cooling water, they are highly decomposed and removed. Therefore, it is possible to effectively prevent the inconvenience that the odor diffuses outside the reduced-pressure fermentation drying apparatus 3.

  A steam boiler 33 that generates steam to be supplied to the drying apparatus main body 31 is generally composed of a burner and a steam boiler main body. The burner mainly uses RPF and wood chips formed using waste paper and waste plastic as fuel, and also uses a combustible gas supplied from the carbonization device 5. Combustion gas obtained by burning fuel with this burner is supplied to the heat exchanger of the boiler body, and water supplied to the heat exchanger is vaporized by the heat of the combustion gas to generate steam. .

  Further, the steam boiler 33 is configured such that indoor air is supplied as combustion air from the processing chamber 311 of the reduced pressure fermentation drying apparatus 3. Air in the processing chamber 311 is supplied to the burner of the steam boiler 33 by a blower (not shown). In addition, you may isolate | separate only indoor air from the condensed water and indoor air which were attracted | sucked with the vacuum pump VP of the vacuum fermentation drying apparatus 3, and you may supply to the burner of the steam boiler 33. FIG. Thereby, the air which has the odor in the process chamber 311 can be burned with a burner, and an odor can be removed. Therefore, the processing chamber 311 of the reduced pressure fermentation drying apparatus 3 can be depressurized without odor spreading to the surrounding environment.

  When the organic waste is dried by the reduced-pressure fermentation drying apparatus 3, the air inside the processing chamber 311 is sucked by the vacuum pump VP to reduce the pressure to a pressure lower than the atmospheric pressure. Here, the boiling point of water can be reduced to about 90-68 degreeC by making the pressure reduction value of the process chamber 311 into 0.03-0.07 MPa. Note that the reduced pressure value refers to a difference in pressure that is reduced from atmospheric pressure.

  As a heating medium to be supplied to the heating unit of the drying apparatus body 31, steam of 0.2 to 0.3 MPa and 130 ° C. is used for the jacket type heater 313, while 0.7 to 0.8 MPa is used for the heating and stirring unit 314. In addition, steam at 170 ° C. is used. Thus, by supplying a heating medium having a temperature higher than that of the jacket type heater 313 that performs heating in a stationary state to the heating and stirring unit 314 that performs heating in a rotationally driven state, the heating and stirring unit 314 and the jacket type Each of the heaters 313 can efficiently heat the object to be processed at a high temperature at which the object to be processed adheres and does not burn. Further, since the inside of the processing chamber 311 is depressurized, the temperature of the heat medium can be set lower than drying at normal pressure. Therefore, the generation energy of the steam as the heat medium can be reduced. In addition, since the heating temperature of the object to be processed is low, it is possible to prevent the microorganisms that are added to the processing chamber 311 and deodorize from being killed, and the deodorization can be performed effectively. For example, the dried organic matter that has been dried and deodorized by the drying apparatus main body 31 is discharged from the outlet 312b at a temperature of about 60 ° C. In this way, the organic waste of the object to be treated is heated to a relatively low temperature, so that the microorganisms can be effectively activated to perform deodorization. Can be dried.

  According to this reduced-pressure fermentation drying apparatus 3, a high-moisture organic waste having a water content of 80 to 99.5 wt% is dried, and the water content is reduced to 10 to 25 wt% in a processing time of 2 to 6 hours. can do.

  Thus, since the reduced-pressure fermentation drying apparatus 3 performs fermentation and drying of organic waste in a reduced-pressure environment, sludge can be dried with a small amount of heat due to a drop in boiling point accompanying reduced pressure. Moreover, the organic waste is decomposed by microorganisms in the reduced-pressure fermentation drying apparatus 3, and the condensed water and gas are decomposed by microorganisms of the cooling water, so that the odor of the organic waste can be effectively reduced, and the surrounding environment can be reduced. Odor diffusion can be prevented. In addition, by adding a known chlorinase in the treatment chamber 311, chlorine-containing substances contained in the organic waste can be removed, and generation of dioxins can be prevented.

  The dried organic matter whose organic waste has been dried by the reduced-pressure fermentation dryer 3 and has a moisture content of 10 to 25 wt% is discharged from the discharge port 312 b on the other end side of the lower portion of the casing 312. The dried organic matter discharged from the discharge port 312b is transported by the discharge conveyor 13, and is sent to the metering feeder 15 formed integrally with the storage silo via the discharge device 14 having an air lock mechanism. A predetermined amount of the dry organic matter once stored in the fixed amount feeder 15 is unwound to the ring die granulator 4.

  FIG. 5 is a diagram showing a main part of a ring die granulator 4 as a granulating apparatus. This ring die granulator 4 is a so-called pellet mill, which extrudes an object to be processed from the inside of a rotating cylindrical body 40 that is rotationally driven through a die hole 40a provided in a body portion. Thus, a granular dry organic substance is formed. The granular dry organic material is preferably formed to have a thickness of 2 mm to 8 mm, and more preferably 4 mm to 6 mm.

  The ring die granulator 4 includes a rotating cylindrical body 40 provided with a die hole 40a, and two rolling cylinders 41 having an outer surface close to the inner side surface of the rotating cylindrical body, 41. The two rolling cylinders 41 are arranged at opposing positions on the diameter of the rotating cylinder 40, and the rolling cylinder 41 has a large number of surfaces that reduce the slip of the workpiece and make it easy to take in. An axial groove is formed. In a state where the rotating cylindrical body 40 and the rolling cylindrical bodies 41 and 41 are rotationally driven in the directions indicated by the arrows R1 and R2, respectively, the dry organic material as the material is put into the rotating cylindrical body 40. The charged material is sandwiched between the inner side surface of the rotating cylindrical body 40 and the outer side surface of the rolling cylindrical body 41 and compressed, and is pushed out from the die hole 40a in the body portion of the rotating cylindrical body 40. . The extruded material is cut out to a predetermined length by fixed blades 42 and 42 arranged to face the body portion of the rotating cylindrical body 40 to obtain a granular dry organic matter. The ring die granulator 4 is suitable for producing relatively small-diameter grains having a diameter of up to about 10 mm, and is suitable when the moisture content of the dry organic material as the material is relatively small.

  In addition to the ring die type granulator 4, other types of granulators such as a flat die type granulator can be used as the granulator. Here, as a flat die granulator, a flat flat die in which a plurality of die holes are formed over an annular region, and a revolution provided in the center of the annular region in which the die holes of the flat die are formed. A roller that is driven to revolve around an axis, and in which the peripheral surface slides or rolls on the surface of the flat die, and pushes the material supplied between the peripheral surface and the surface of the flat die into the die hole. Things can be used.

  The granular dry organic matter formed by the ring die granulator 4 is transported by a transport conveyor 16 and sent to a fixed amount feeder 17 formed integrally with a storage silo. A predetermined amount of the granular dry organic matter once stored in the metering feeder 17 is unwound to the carbonization device 5.

  FIG. 6 is a schematic cross-sectional view showing the carbonization apparatus 5. The carbonization apparatus 5 is comprised by the external heating type rotary kiln. The carbonization apparatus 5 includes a casing 51 to which a heat transfer gas is supplied, a rotary furnace 52 accommodated in the casing 51, and one end of the rotary furnace 52 connected to one end of the rotary furnace 52 to remove dry organic matter to be processed from the rotary furnace 52. A supply conveyor 56 to be supplied therein and a discharge chamber 57 that communicates with the other end of the rotary furnace 52 and discharges the processed object and combustible gas. A heating chamber 53 is formed between the casing 51 and the rotary furnace 52 to introduce a heat medium and heat the rotary furnace 52 from the outside. Inside the rotary furnace 52 is a carbonization chamber 54 that performs dry distillation and carbonization of the dry organic matter with the heat of the heat medium supplied to the heating chamber 53 while sending the dry organic matter introduced into one end by the supply conveyor 56 to the other end. Is formed. On the inner peripheral surface of the carbonization chamber 54, a spiral guide (not shown) for sending the object to be processed to the other end is provided. The discharge chamber 57 communicates with the carbonization chamber 54 inside, and discharges the organic carbide, which is the object to be treated, carbonized in the carbonization chamber 54 by the discharge conveyor 18 connected to the lower end, while drying in the carbonization chamber 54. The combustible gas produced | generated from the organic substance is discharged | emitted from the exhaust port 59 provided in the upper end. A flammable gas pipe 60 for deriving flammable gas is connected to the exhaust port 59, and a downstream end of the flammable gas pipe 60 is connected to a carbonization device pipe 61 connected to the heating chamber 53 side of the carbonization device 5 and steam. Branching to a boiler pipe 62 connected to the burner of the boiler 33. The carbonization device pipe 61 is connected to a gas burner 67 installed in the heating chamber 53 of the carbonization device 5 so that a flame opening is desired. The carbonizer pipe 61 and the boiler pipe 62 are provided with electromagnetically driven on / off valves 63 and 64, respectively. The on / off valves 63 and 64 are controlled to be opened and closed by a control unit 65 described in detail later. The combustible gas pipe 60 is provided with a blower (not shown). The blower sucks the air in the carbonization chamber 54 and causes the air in the carbonization chamber 54 containing the combustible gas to flow into the carbonizer piping 61 and It is sent to the boiler piping 62. By sucking the air in the carbonization chamber 54 with this blower, the inside of the carbonization chamber 54 is in a low oxygen environment with an oxygen concentration of 5% or more and 12% or less by volume. Thereby, the dry organic substance heated in the carbonization chamber 54 is effectively carbonized, and a combustible gas such as carbon monoxide is efficiently generated. The heating temperature of the dry organic matter in the carbonization chamber 54 is preferably 350 ° C. or more and 500 ° C. or less, and the heating time of the dry organic matter is preferably 5 minutes or more and 10 minutes or less.

  Heat medium gas is supplied from the oil burner 55 to the heating chamber 53 of the carbonization device 5 when the carbonization device 5 is started. The oil burner 55 is connected to a heavy oil fuel tank 68 that uses A heavy oil as a liquid fuel and supplies A heavy oil. The oil burner 55 is controlled by the control unit 65, burns A heavy oil, and supplies combustion gas at 500 to 700 ° C. to the heating chamber 53 as a heat transfer gas. When the temperature in the carbonization chamber 54 is sufficiently increased by the combustion gas as the heating medium gas supplied from the oil burner 55 to the heating chamber 53, the dry organic matter in the carbonization chamber 54 is heated, and hydrogen, carbon monoxide, and methane are heated. A flammable gas containing etc. is produced. When the generation of the combustible gas is started in the carbonization chamber 54, the combustion of the oil burner 55 is stopped by the control unit 65, and the on-off valve 63 of the carbonization apparatus pipe 61 is controlled to change from the closed state to the open state. Driven. As a result, the supply of the heating medium gas from the oil burner 55 is stopped in the heating chamber 53, while the combustible gas is supplied from the carbonizer piping 61 to start the gas burner 67, and the combustible gas is generated by the gas burner 67. The combustion gas as the heat medium gas is supplied to the heating chamber 53 by burning. Thus, heating in the carbonization chamber 54 is continued. Combustion gas formed by burning combustible gas in the heating chamber 53 is discharged from the heating chamber 53 and led to the heat exchanger of the steam boiler 33 of the vacuum fermentation drying apparatus 3 as a heat transfer gas. Since the combustion gas discharged from the heating chamber 53 has a temperature of 250 to 500 ° C., it can be reused to generate steam to be supplied to the drying apparatus main body 31 by the steam boiler 33. As described above, the combustion gas of the carbonization device 5 is supplied to the steam boiler 33 as a heat transfer gas, and the steam boiler 33 is configured to use surplus heat when the dry organic matter is heated by the carbonization device 5. . The combustion gas used for generating steam in the heat exchanger of the steam boiler 33 is exhausted after dust is removed by the dust collector 66.

  In this way, since the combustion gas of the carbonization device 5 is supplied to the heat exchanger of the steam boiler 33 as a heat medium gas, and the surplus heat when the dried organic matter is heated by the carbonization device 5 is used in the steam boiler 33. The combustible gas generated by the carbonization of the dried organic matter in the carbonization device 5 can be used for heating the carbonization device 5 and for heating the reduced-pressure fermentation drying device 3 for drying the organic waste. Therefore, the fossil fuel used for the drying and carbonization treatment of organic waste can be effectively reduced. As a result, greenhouse gas emissions such as carbon dioxide and air pollutants such as nitrogen oxides can be effectively eliminated. Can be reduced.

  Further, the steam boiler 33 is configured such that a part of the combustible gas generated from the dry organic matter by the carbonization device 5 is supplied as fuel. Specifically, when combustible gas is generated from the dry organic matter in the carbonization chamber 54, the controller 65 opens the on-off valve 64, and the combustible gas is supplied to the burner of the steam boiler 33 through the boiler pipe 62.

  Thus, in order to dry the organic waste in the reduced-pressure fermentation drying apparatus 3, in addition to the excess heat of the carbonization apparatus 5, the amount of fossil fuel used can be reduced by utilizing the combustible gas generated in the carbonization apparatus 5. Organic waste can be efficiently dried while reducing.

  The organic carbide formed by the carbonization device 5 is conveyed by a discharge conveyor 18 and sent to a fixed amount feeder 20 formed integrally with a storage silo via a discharge device 19 having an air lock mechanism. The organic carbide stored in the metering feeder 20 is subjected to a desired treatment according to the type of the final product. The organic carbide produced in the present embodiment can be used as a material such as fertilizer, fuel, adsorbent, soil conditioner and reducing agent.

  In particular, when a fuel is produced using the organic carbide, a large amount of heat can be obtained as compared with a fuel produced using an organic waste that is not carbonized. For example, fuel that is formed without carbonizing wood waste as organic waste has a calorific value of approximately 3800 kcal / kg. On the other hand, the fuel obtained by carbonizing wood chips and molding this carbide in the carbonization plant of this embodiment has a calorific value of 7000 to 8000 kcal / kg. Moreover, the surplus sludge as organic waste is carbonized to form an organic carbide, and the fuel obtained by molding the organic carbide has a calorific value of 5000 to 6000 kcal / kg. Further, it is preferable that the fuel using the organic carbide is a solid fuel formed by mixing organic carbide with plastic and paper to obtain a high calorific value and good handleability. As such a solid fuel, for example, an organic carbide mixed at a ratio of 40 to 60 wt%, waste plastic at 30 to 50 wt%, and waste paper at a ratio of 10 to 30 wt% and formed into a rod shape can be adopted. As shown in FIG. 1, the solid fuel formed using the organic carbide can be used as a fuel for the steam boiler 33 of the vacuum fermentation drying apparatus 3. In this case, since the fuel using the organic carbide of the product is burned during the manufacturing process of the organic carbide, the amount of fossil fuel used can be reduced by reusing the carbonization target, and the greenhouse gas emissions can be reduced. Can be reduced.

  As described above, according to the carbonization plant 1 for organic waste according to the present embodiment, microorganisms are added to organic waste by the reduced-pressure fermentation drying device 3 and heated in a reduced-pressure environment. Organic waste can be effectively dried by using less fuel while reducing odor with microorganisms. Moreover, since the organic waste can be dried at a relatively low temperature of 100 ° C. or less by the reduced-pressure fermentation drying apparatus 3, the amount of combustible gas generated from the organic waste can be suppressed. Therefore, a large amount of combustible gas can be collected from the dried organic matter by the carbonization device 5, and the fuel derived from the organic waste can be efficiently recovered, and the fuel for heating in the vacuum fermentation drying device 3 and the carbonization device 5. Can be used for As a result, the ratio of fossil fuel to the fuel used in the vacuum fermentation drying apparatus 3 and the carbonization apparatus 5 can be reduced, fuel costs can be effectively reduced, and greenhouse gas emissions such as carbon dioxide and nitrogen oxides can be reduced. Emissions of air pollutants such as can be effectively reduced. Moreover, since the combustible gas produced | generated from the organic waste is burned with the heating chamber 53 of the carbonization apparatus 5, and the burner of the steam boiler 33, the spreading | diffusion of the odor produced from an organic waste can be prevented effectively.

  Further, the reduced-pressure fermentation drying apparatus 3 condenses the water evaporated from the organic waste in the condensing unit 315, and the condensed water condensed in the condensing unit 315 and the air in the processing chamber 311 are added with microorganisms to Since it mixes with the cooling water supplied to the condensation part 315, the spreading | diffusion of the odor which arises in the drying process of an organic waste can be prevented. Moreover, since the cooling tower 32 is provided with a deodorizing function, organic waste with a large amount of water can be effectively dried with a small apparatus configuration, and the odor diffusion of the organic waste can be prevented. Further, since the air in the processing chamber 311 is supplied as combustion air to the burner of the steam boiler 33, the odor in the processing chamber 311 can be burned by the burner, and the odor diffusion can be prevented.

  In addition, the reduced-pressure fermentation drying apparatus 3 evaporates moisture by heating in a reduced-pressure environment, and condenses and collects the moisture evaporated from the organic waste in the condensing unit 315, so that the excess sludge having a moisture content exceeding 98 wt%, etc. The organic waste can be quickly dried with a relatively small amount of fuel consumption without dehydration by a dehydrator. Therefore, since the process of dewatering excess sludge with a dehydrator can be eliminated, the apparatus configuration of the solid fuel production plant 1 can be simplified, and the labor of the solid fuel production process can be reduced.

  As described above, according to the carbonization plant 1 of the present embodiment, the dry organic matter is carbonized by the carbonization device 5, whereby the odor derived from the organic waste can be reduced and the organic carbide with less odor can be produced. . Furthermore, by performing carbonization with the carbonization apparatus 5 after drying with the reduced-pressure fermentation drying apparatus 3 of the present embodiment, the inconvenience that odor derived from organic waste diffuses to the surrounding environment is also effective in the manufacturing process of organic carbide. Can be prevented.

  Moreover, since the dry organic substance granulated with the ring die-type granulator 4 is carbonized with the carbonization apparatus 5, it solidifies and the dry organic substance with few fine particles is heated in the carbonization chamber 54 of the carbonization apparatus 5. FIG. Thereby, the fine particle of the dry organic substance and carbide mixed in the combustible gas discharged | emitted from the exhaust port 59 can be decreased. Accordingly, the combustible gas pipe 60, the carbonizer pipe 61 and the boiler pipe 62 for supplying the combustible gas to the heating chamber 53 and the steam boiler 33, and from the heating chamber 53 to the dust collector 66 through the heat exchanger of the steam boiler 33. Dust accumulated in the path of the combustion gas to reach can be reduced. That is, by solidifying the dry organic matter carbonized by the carbonization device 5 into particles, dust of the combustible gas recovered by the carbonization device 5 can be reduced. As a result, combustion of the combustible gas in the heating chamber 53 and heating The combustible gas can be used for a plurality of uses such as reusing the surplus heat combusted in the chamber 53 in the steam boiler 33 or burning the combustible gas in the steam boiler 33. Moreover, by solidifying the dry organic substance carbonized with the carbonization apparatus 5 into a granular form, the loss by the production | generation of dry organic substance and the dust of organic carbide can be reduced, and the yield of organic carbide can be raised.

  In the said embodiment, although a part of combustible gas produced | generated by the carbonization apparatus 5 was used as a fuel of the steam boiler 33 of the pressure reduction fermentation drying apparatus 3, the combustible gas produced | generated by the carbonization apparatus 5 is the steam boiler 33's. It does not have to be used for fuel.

  Moreover, in the said embodiment, although the dry organic substance obtained by drying an organic waste with the reduced pressure fermentation drying apparatus 3 was granulated with the ring die type granulator 4, and carbonized with the carbonization apparatus 5, dry organic substance is not necessarily granular. It does not have to be converted. That is, the dried organic matter processed by the reduced-pressure fermentation drying apparatus 3 may be carbonized by the carbonization apparatus 5 in a powder state.

  Further, in the above embodiment, surplus sludge is used as organic waste, but as organic waste, sludge accumulated on the bottom of lakes and seas, waste discharged in the agricultural and fisheries industry, and discharged from food factories. You may use the organic substance with high water | moisture content produced with the production process and waste water treatment of various industries, such as food residue and garbage discharged | emitted from a general household. In addition, high moisture means that the ratio of the water | moisture content with respect to the whole mass of waste is 80 wt% or more.

DESCRIPTION OF SYMBOLS 1 Carbonization plant of organic waste 3 Vacuum decompression drying machine 4 Ring die type granulator 5 Carbonization equipment

Claims (9)

A vacuum drying step in which organic waste is added in a microorganism and heated in a vacuum environment to form dry organic matter;
A condensation step of condensing moisture evaporated from the organic waste in the vacuum drying step;
In the condensation process, water is cooled, and the cooling water to which microorganisms are added is mixed with the condensed water produced in the condensation process and the gas containing the odor produced in the reduced pressure drying process, and the cooling water is cooled. A mixing and cooling step;
A carbonization step of heating the dry organic matter in a low oxygen environment to form an organic carbide and generating a combustible gas;
Combusting the combustible gas generated from the dried organic matter in the carbonization step as a fuel for heating in the vacuum drying step and the carbonization step,
In the reduced-pressure drying step, a casing for introducing organic waste to decompress the inside thereof, a heating and stirring unit that is rotatably arranged in the casing to stir and heat the organic waste, and provided in at least a part of the casing And a heating unit that heats the organic waste, and a heating medium heated by combustion of the combustible gas in the combustion step is applied to the heating stirring unit and the heating unit of the vacuum drying unit. The method for carbonizing organic waste, wherein the heat medium supplied and supplied to the heating unit is lower in pressure and temperature than the heat medium supplied to the heating and stirring unit . The method for carbonizing organic waste according to claim 1,
A method for carbonizing an organic waste, characterized in that surplus heat of heating in the carbonization step is used for heating in the vacuum drying step. The method for carbonizing organic waste according to claim 1,
A method for carbonizing organic waste, comprising a combustion air supply step for supplying the gas generated in the vacuum drying step as combustion air for heating the organic waste in the vacuum drying step. The method for carbonizing organic waste according to claim 1,
Before the carbonization step, comprising a granulation step of granulating the dry organic matter formed in the vacuum drying step,
An organic waste carbonization method comprising heating the granulated dry organic matter in the carbonization step. The method for carbonizing organic waste according to claim 1,
A carbonization method for organic waste, characterized in that a powder of a wooden material is added in advance to the organic waste to be treated in the vacuum drying step. A vacuum drying apparatus that heats organic waste to which microorganisms are added in a vacuum environment to form dry organic matter;
A carbonization device that heats the dried organic matter in a low oxygen environment to form an organic carbide and generate a combustible gas;
The reduced-pressure drying apparatus is provided in at least a part of the casing, in which the organic waste is charged and the casing is depressurized, the organic waste is stirred and heated while being rotatably disposed in the casing. A heating unit that heats the organic waste, a condensing unit that condenses the vapor from the organic waste, cooling water supplied to the condensing unit to which microorganisms are added, and condensed water generated in the condensing unit And a suction pump that sucks the gas containing odor generated by drying the organic waste from the casing, and the cooling water is mixed with the condensed water sucked by the suction pump and the gas, and the cooling water is cooled. And a mixing cooler that
For the heating of the carbonization apparatus, the combustible gas generated from the dried organic matter in the carbonization apparatus is used as a fuel, and the heating stirring unit and the heating unit of the reduced-pressure drying apparatus are generated from the dried organic matter in the carbonization apparatus. Organic waste, characterized in that a heating medium heated by burning a combustible gas is supplied, and the heating medium supplied to the heating unit is lower in pressure and temperature than the heating medium supplied to the heating and stirring unit Carbonization plant. In the organic waste carbonization plant according to claim 6,
A carbonization plant for organic waste, characterized in that surplus heat when heating dry organic matter in the carbonization device is supplied to the heating section of the vacuum drying device and used. In the organic waste carbonization plant according to claim 6,
An organic waste comprising a second suction pump for sucking the gas in the casing of the vacuum drying apparatus and supplying the suctioned gas as combustion air to a heat source device for heating the vacuum drying apparatus Carbonization plant. In the organic waste carbonization plant according to claim 6,
An organic waste carbonization plant comprising a granulation device formed by the vacuum drying device and granulating dry organic matter before being charged into the carbonization device.

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