JP3489134B2 - Composting method and apparatus for kitchen waste - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composting method and apparatus for aerobically fermenting garbage to convert it into compost.

[0002]

2. Description of the Related Art Kitchen waste discharged from homes and the food service industry is
It is mainly disposed of by incineration or landfill. Incineration requires final disposal of exhaust gas and incinerated ash, and landfill has many environmental issues such as groundwater pollution and difficulty in location.

Aerobically fermenting garbage with aerobic microorganisms,
The method of converting to compost, so-called compost, has been attracting attention as a pollution-free treatment method instead of incineration or landfill.

The composting method of kitchen waste is mainly a mixing and stirring method of heating under forced stirring and contacting with oxygen for fermentation, a method of depositing and fermenting in a stationary state or a method of depositing and intermittently mixing so-called turning back. The fermentation method is carried out in a semi-static state.

As an example of the former, (1) JP-A-1-226786
Japanese Unexamined Patent Publication No. "High-speed fermentation apparatus for organic matter", (2) JP-A-61-2810
No. 91, “Method and apparatus for rapidly fermenting organic waste to form compost”, (3) JP-A-60-255686, “Compost manufacturing method”, etc.

As an example of the latter, (4) JP-A-54-101769
JP-A-58-8747, "Compost manufacturing container" and the like, "Aerobic fermentation decomposition treatment method and apparatus for organic solid waste", (5) Jitsukai Sho 58-87847.

In addition to these, the raw material organic waste and the compost are mixed, and then the granulated particles are directly deposited and fermented (6) JP-A-58-55389, "Organic waste" Method for composting ", compost is mixed with inoculum and fermented (7) JP-A-53-44363," Method for producing sludge / compost ", the depositing place of raw material waste is sequentially moved, and (8) US Pat. No. 3,858,504 "Press for Treating Household"
Refuse, completes composting while sequentially moving fermentation reactants from one end compartment of a multi-compartment fermentor to the next (9) US Patent No. 4143731 "Composting Apparatas with Communication Moisture Control" And Macerator Means ", a so-called pretreatment that crushes and removes excess water before fermentation (10) U.S. Pat. No. 3,858,504" Press For Treating Household "
Rifuse ”, (11) European Patent No. 309872“ Felterren Zum Compostielen Formula ”,
(12) Japanese Unexamined Patent Publication No. 63-17282, "Method of processing garbage", (1
3) There is a method described in Japanese Unexamined Patent Publication No. Hei 1-167293 “Garbage Disposer”.

[0008]

In the method of composting by aerobic fermentation, excessive contact between kitchen waste and air, and when the kitchen waste is decomposed, water is exuded from the cells to block air gaps between particles. There are problems such as poor contact that must be resolved.

An object of the present invention is to subject a substance containing kitchen waste and inoculum to stirring and aeration heating during the garbage treatment to decompose the constituent components and to effectively exude water and dry it. a semi-dry product of moisture content suitable for Piling, its
After the time of fermentation, without negative effects may occur during deposition fermentation is to obtain an efficient composting method and apparatus garbage that can be composted.

[0010]

Means for Solving the Problems The method for composting kitchen waste according to the present invention comprises crushing and mixing a material containing kitchen waste and inoculum.
And a step of performing a garbage treatment to semi-dry to a semi-dried product,
After the step of carrying out the garbage treatment, the garbage-treated semi-dry
Kitchen waste component containing a fermentation process for aerobically fermenting dried foods
In the method of forming a strike, in the step of applying the garbage treatment,
Stir and aerate the substance containing garbage and seeds to
Biochemistry of macromolecular hydrolase in substances containing inoculum
The cytoplasmic fluid is exuded from the cells of the garbage by the static decomposition action.
The semi-dried product has a water content suitable for sedimentary fermentation.
It is characterized by Alternatively, the kitchen waste composting device of the present invention crushes and mixes a substance containing kitchen waste and inoculum.
And a garbage treatment tank that is semi-dried to form a semi-dried product, and the garbage treatment
Aerobically fermenting the semi-dried product treated in the bath
And a fermentation tank, and the kitchen waste and the inoculum in the kitchen waste processing tank
Stir and aerate the contained substance to contain the inoculum.
Biodegradation of macromolecular hydrolase in oxidative substances
More than that, the cytoplasmic fluid is exuded from the cells of the garbage to make sedimentary fermentation.
Agitating means and a semi-dried product to obtain an appropriate water content
And ventilation heating means .

The particle size of the garbage in the mixture is preferably larger than the cell diameter of animals and plants in the garbage and about 10 mm or less. For example, 2 or 3 mm or more and about 10 mm or less.
As for the crushed particle size of kitchen waste, it is desirable to consider the contact area between the kitchen waste and the inoculum.

[0012] It is preferable that the garbage treatment process is performed for 30 minutes to 5 hours. In order to exude the cytoplasmic fluid by the biochemical decomposition action of the bacterium and the high-molecular hydrolase, it is desirable to heat to a predetermined temperature range and hold for 5 minutes to 20 minutes or 30 minutes or 1 hour. It should be noted that the heating temperature range is preferably a temperature at which the inoculum does not die and the polymer hydrolase does not significantly inactivate, and the temperature at which the bacteria act and the temperature at which the enzyme acts. For example, 80 at about 30 or 40 ℃ or higher
Keep below ℃. If the temperature is around 60 ° C, the treatment efficiency is good.

When the cytoplasmic fluid is exuded by the biochemical decomposition action of the bacterium, it is carried out in the presence of water. If possible, the water content is preferably 40% by weight or more.

The inoculum and / or the substance containing the enzyme include
Dry compost containing aerobic bacteria can be used.

Examples of the crushing method include crushing by rotating or revolving the wheel, cutting by a rotary blade, and crushing by a rotary hammer.

It is desirable that the fermenter is provided with the number of days required for the kitchen waste to complete the fermentation plus one or more.

In the following, the water content is 15% by weight.
The following composts are specifically described as dry composts.

[0018]

In the present invention, the substance containing garbage and seed bacteria is destroyed.
Crush, mix, and semi-dry to give garbage treatment
After the step and the step of performing the garbage treatment, the garbage treatment
Kitchen waste including a fermentation step of aerobically fermenting the semi-dried product
A method of composting, comprising the step of performing the garbage treatment
Then, stir and aerate the substance containing the garbage and the inoculum.
Then, the polymer hydrolase in the substance containing the inoculum
By the biochemical decomposition action of the
Semi-dry to leach to a water content suitable for sedimentary fermentation
By making it a dried product, when the garbage treatment is applied, the garbage and seeds
Stir and aerate the substance containing the fungus, and
As the water is decomposed, the water is effectively exuded and dried to
A semi-dried product with a water content suitable for product fermentation, and then fermentation
In this case, there is no adverse effect during sedimentary fermentation and
You can post it. Alternatively, in the present invention, the kitchen
Crush, mix and semi-dry the material containing the mustard and inoculum
A kitchen treatment tank that is a semi-dried product, and a treatment in the kitchen treatment tank
And a fermenter for aerobically fermenting the semi-dried product,
In the kitchen waste treatment tank, a substance containing the kitchen waste and inoculum
After stirring and aeration heating, the
Due to the biochemical decomposition action of the molecular hydrolase, the kitchen waste is finely divided.
Water content suitable for sedimentary fermentation by exuding cytoplasmic fluid from cells
Means and aeration heating means for producing a semi-dried product
By providing the garbage, when the garbage treatment is applied, the garbage and the inoculum
The substance containing is stirred and aerated to heat the constituents.
As it decomposes, it effectively exudes moisture and dries to accumulate.
A semi-dried product with a water content suitable for fermentation, and then
In this case, there is no adverse effect during sedimentary fermentation,
Can be posted.

During the garbage treatment, when the substance containing the inoculum is brought into contact with kitchen waste while stirring at a temperature at which the enzyme acts and aerobic bacteria are active, the bacteria and the enzyme biochemical decomposition action, Specifically, the enzyme in the substance mainly containing the inoculum decomposes the components of the cell membrane and cell wall, and the enzyme is secreted from the bacterium without the growth of the bacterium, and the catalytic action of the enzyme effectively It is possible to exude cytoplasmic fluid and the like from tissues and cells. The exuded water content is adjusted by a stirring means, aeration heating means, or the like so that the water content is suitable for sedimentary fermentation. Further, by supplying oxygen during the contacting, there was an effect of preventing anaerobic fermentation which causes acidification and generation of malodor.

The studies conducted by the inventors of the present invention have revealed that not only conventional simple draining and dehydration but also the effect of exuding water contained in the cytoplasm of animal and plant tissues is small with ordinary presses. In this state, even if the water content is adjusted before the fermentation, the water content of the cytoplasm exudes during the fermentation, and it is difficult to ferment aerobically in the accumulated state.
For mere crushing and dehydration, by using the biochemical decomposition action of bacteria and enzymes to exude cytoplasmic fluid etc. from tissues and cells,
Aerobic fermentation enables effective composting. In the present invention, it is preferable to perform the crushing, mixing, and semi-drying treatments substantially simultaneously using the same stirring means.
As a stirring means for this purpose, for example, a scraping plate or a grinding wheel may be used.

By doing so, the garbage processing device can be downsized, the processing speed is fast, and the structure is easy to maintain.

The semi-dried product produced by the garbage treatment is
It is deposited batchwise on a fermenter selected from a plurality of fermenters. For this reason, it is possible to continuously process the garbage according to the order in which it is generated.

The fermenter is ventilated with gas and kept at an appropriate temperature by heating means.

Since the mixture of garbage and seed-containing material is partially decomposed by the above-mentioned garbage treatment and becomes a semi-dried product, water contained in the cytoplasm or the like is exuded during the sedimentation fermentation, and voids between the sediments are formed. It is possible to prevent the blockage and adverse effects on fermentation and the like, and it is possible to proceed the fermentation efficiently.

The number of fermenters is 1 for the number of days required for fermentation of kitchen waste.
If at least the number of foodstuffs is added, the garbage for at least each day can be sequentially composted in an independent fermentation tank.

When the fermentation is completed, the compost can be dried in the fermenter by further ventilating and heating. Drying time can be shortened by raising the aeration rate at a higher temperature than fermentation.

The dry compost can be stored by providing a storage device.

High BOD by draining, dehydration and pressing
In the conventional kitchen waste treatment equipment that discharges wastewater, it is necessary to add a device for treating the wastewater in addition to the treatment equipment. However, in the present invention, high BOD wastewater is not discharged, and there is no adverse effect on the environment. There are few and the device can be simple.

As the heating means of the present invention, it is possible to use a low-cost heat source, for example, a heat accumulating means that uses late-night power and solar heat.

In order to operate the present invention efficiently, it is preferable to use at least kitchen waste mainly containing leftover food and cooking waste.

If the garbage contains metal, glass, plastic, etc., it should be excluded. It is conceivable that magnetic metals may be selected and removed by magnetic force at the entrance of the device. Animal bones, seeds, small amounts of paper, vegetable fibers, shells, etc. may be contained in the garbage.

[0032]

【Example】

(Embodiment 1) An example of the basic configuration of a kitchen composting device and the basic follow-up of a composting method according to the present invention will be described below with reference to FIG.

The garbage A and the substance B ₃ containing the inoculum put into the garbage treating tank constituting the garbage treating apparatus 10 are crushed / mixed / semi-dried by a means that contributes to crushing, mixing or drying. Large-grain fish, animal bones, shells, root vegetable pieces, etc. can also be crushed. During the crushing and mixing, it is preferable to supply heat from the heating means 30 and to ventilate the gas C containing oxygen. During crushing and mixing, if the animal and plant tissues in the garbage come into contact with the enzymes contained in the substance containing the inoculum and the enzymes secreted by the aerobic bacteria, they will be partially decomposed and cytoplasmic fluid etc. from the tissues and cells will be generated. It exudes.

The kitchen waste that is put into the kitchen waste treatment tank is contacted with the enzyme of the bacterium, so that water is usually exuded from a considerable amount of cell tissue after about 1 to several hours of treatment.

The mixture containing the exuded water is made into a semi-dried product D having a water content suitable for sedimentary fermentation by means such as stirring means and aeration heating. The semi-dried product preferably has a water content of substantially 40 to 65% by weight and becomes granular.

Further, in the present invention, it is possible to contribute to the progress of the crushing, mixing and semi-drying treatments substantially simultaneously using the same stirring means. For example,
A scraping plate or a grinding wheel can be used as the same stirring means. Therefore, the garbage processing device can be downsized, the processing speed can be fast, and the structure can be easily maintained.

The semi-dried product D pretreated in the garbage processing device 10 is transferred by a transfer means 70 if necessary.
Means 10 for transferring, distributing and depositing the semi-dried matter D
By 0, the semi-dried product is batch-wise deposited in the fermenter selected from the plurality of fermenters constituting the fermenter 80. For this reason, it is possible to continuously process the garbage according to the order in which it is generated.

Oxygen-containing gas C is aerated in the selected fermenter and kept at an appropriate temperature by heating means 90 or the like.

Since it is partially decomposed and becomes a semi-dried product by the treatment with the above-mentioned garbage treatment device, water contained in the cytoplasm and the like is exuded during the sedimentation and fermentation, and the voids between the sediments are clogged, resulting in fermentation and the like. It is possible to prevent adverse effects on the.

Since the decomposition of the sediment is promoted by the oxidation of the organic matter of the aerobic bacterium used as the seed bacterium, most of easily decomposed components such as starch, protein and fat are contained in the fermenter in an amount of 3 to 3
Decomposes in about 5 days and completes the prescribed fermentation. Usually temperature 4
It is kept in a fermenter at 0 to 60 ° C. for several days to one week, and is used as a compost B1 as a whole. If the number of fermentation tanks is set to be equal to or greater than the number of days required for fermentation of kitchen waste plus one, at least each day's kitchen waste can be subjected to composting treatment in an independent fermentation tank.

When carbon dioxide and water are generated by fermentation or the like, or the exhaust E can be exhausted by the exhaust means 130.

When the predetermined fermentation is completed, if further aeration and heating are performed, the compost B ₁ can be directly converted into the dried compost B ₂ in the fermentation tank. Drying time can be shortened by raising the aeration rate at a higher temperature than fermentation.

The dried compost B ₂ can be taken out from the fermenter by means 110 for taking it out and can be stored by providing a storage device 120.

The storage device 120 can be provided with a means 130 for discharging exhaust gas, if necessary.

Further, it is preferable to provide a means 60 for transferring a part of the dry compost B ₂ to the garbage processing apparatus 10.

It is also possible to determine the conditions such as the heating temperature or the aeration rate by grasping the fermentation state, the dry state, etc. from the measured values of a sensor or the like.

(Embodiment 2) The apparatus and flow shown in FIG. 2 shows one embodiment for medium- and large-scale. Garbage A containing a component having a large particle size and substance B ₃ containing inoculum (dry compost B ₂ was used in this example) are opened in the garbage treating tank 14 by opening the upper lid 12 of the garbage treating tank 14. The processing bath 14 may include a bath heater.

The amount of the substance B ₃ containing inoculum added is in the range of 1 to 10% by weight based on the weight of the garbage. A vertical cylindrical motor 13 installed at the bottom of the garbage processing tank, a rotary shaft 16 connected to the vertical motor 13, and a support arm 1 connected to the rotary shaft 16.
8 is provided with a rotatable wheel 15 for crushing at the tip of the arm. At least one arm
It has joints at several points and has a suspending function to handle the vertical movement of the wheel. If necessary, it has a movable function including joints that correspond to left and right movements. The grounding surface of the wheel is grooved so that it can be easily crushed and cut. It has a scraping plate for mixing and stirring and scraping, which has a rotating shaft in the same direction as the revolution axis of the wheel, and slides on the bottom surface of the garbage processing tank.

It is sufficient that the garbage processing tank, the wheel and the scraping plate 17 are rotated relative to each other, and the structure, operating method and the like are determined depending on the situation. Further, the tank heater 11 is provided.

A temperature sensor 19 is arranged in the gas phase portion on the upper surface of the garbage processing tank, and the progress of drying can be monitored by using the temperature measuring device 27 by the temperature change of the gas phase. The temperature sensor is
Depending on the situation, install it in a place you think is desirable. In some cases, measure the humidity, weight, gas components generated from kitchen waste, etc. to grasp the dry state. For heating and ventilation, a part of the outside air C is introduced into the system through the blower 21 and the heater 20,
Exhaust gas 133 is discharged to the outside of the system through the valve 132 and the pipe 131.

When the water content reaches about 40 to 65% by weight after being treated in the garbage treatment tank, the internal structure of the tank is rotated to open the damper 22 at the opening of the tank bottom to obtain the semi-dried product D. Drop it into the receiving tank 23. At this time, the crushed kitchen waste has a size of a tissue piece or cell level (about 5 mm or less). Then, the valves 88 and 98 are opened, and the fermentation tanks 82, 83, 8 are opened.
Pipe-shaped valves 87, 90, 9 coming in and out from 4, 85
By operating the blower 96 with 1,99 closed, the semi-dried product D is put into the fermenter 81 which is currently being charged.
Is suction-transferred through the pipe 101 and the valve 88 and deposited in the fermenter. A small amount of fine particles that do not fall into the fermenter 81 but are entrained in the gas and the gas are separated by the cyclone 95, and the exhaust gas 134 is discharged to the outside of the system. When the preparation is completed, the valve 90 is opened, the blower 96 is operated, and the outside air is piped 93
Through the valve to the exhaust gas through the valve 98 and the flow meter 62,
It is similarly discharged to the outside of the system through the pipe 97. The heater 86 keeps the temperature suitable for fermentation. By loading each kitchen waste (semi-dried product D) into an empty fermenter to start fermentation, the load is dealt with. When the predetermined fermentation is completed, the process begins to dry. When the predetermined fermentation is completed, it is desirable that the easily decomposable component is reduced to a substantially nonexistent level.

The dried compost B _{2 which} has been dried is stored in the storage device 121. A part of it is returned to the secondary storage tank 26 through the pipe 61 and then to the secondary storage tank 26 for use as an inoculum. Depending on the conditions, a means for returning the compost B ₁ that has undergone a predetermined fermentation in the fermentation tank to the secondary storage tank 26 is provided.

(Embodiment 3) FIG. 3 shows an embodiment of a small apparatus for home use and its flow. FIG. 4 is a plan view of the garbage processing tank 14, and FIG. 5 is a horizontal cross-sectional view of a fermentation apparatus part including the fermentation tanks 81 to 85.

Kitchen waste A and dried compost B for inoculum
₂ is introduced into the kitchen treatment tank 14 through the inlet 129 opened by sliding the lid 12. The processing bath 14 may include a bath heater.

By rotating the crushing wheel 15 and the scraping plate 17 suspended by the support arm 18 from the rotary shaft 16 at the center of the tank by the motor 13, the garbage components are crushed, stirred, and attached to the inner wall of the garbage processing tank. Kimono etc. are scraped off. Grooves 124 are engraved on the ground contact surface of the wheel to facilitate grinding and cutting. In the meantime, the outside air C is heated by the heater 20 and introduced into the kitchen waste treatment tank through the pipe 24 to evaporate the water content, so that the water content is about 40.
˜65% by weight of semi-dry product D is obtained. D falls from the opening 111 at the bottom of the garbage treatment tank into the designated fermentation tank 81 in the lower stage through the opening 112 and deposits. Opening 111
Has a gate valve 117 and is opened and closed by a solenoid 118. The fermentor is independent by a circular partition,
The kitchen waste treatment tank as the upper structure, the lower structure and the tank core are hermetically sealed by an O-ring packing, and can be rotated by a revolver type around a vertical axis. The rotation is performed by moving the gear 128 by the motor 127.

The fermentation tanks 82 to 85 are sequentially charged in a batch system and aerobically fermented by aeration and heat retention. The outside air C is heated by the heater 31, supplied from the pipe 32 through the pipe 93, and through the ventilation port 115 of each fermentation tank. Also, the heater 8
In step 6, the temperature is maintained at a temperature suitable for fermentation. The exhaust gas 135 passes through the pipe 97 from the sliding opening 116, and passes through the deodorizing device 136 and.
It is discharged through the blower 96. Depending on the conditions, a desulfurization tank may be installed in the blower section. The compost B ₁ in the fermenter in which the fermentation is completed is further aerated and dried. After that, the generated dry compost B ₂ was opened and closed by the opening / closing mechanism 1.
The gate valve 125 of 14 is opened by the solenoid 126, and the water is stored in the lowermost storage device 121 through the opening 113. 122 is a dry compost B ₂ sampling port, and 140 is an operation panel. The system is housed in a casing 123.

(Embodiment 4) FIG. 6 shows an embodiment of the present invention. The kitchen waste A and the dried compost B ₂ for seeds are supplied into the kitchen processing tank 14 through the opening 12 of the lid 12 and the charging port 129. The garbage processing tank 14 has a support arm 145 and a bearing 1
44, and the rotational force of the motor 13 is applied to the speed reducer 1
It rotates by being transmitted to the garbage processing tank wall via 43 and the gear 142.

Reference numeral 147 is a support arm, and 149 is a bottom plate.

FIG. 7 shows a section taken along the line aa 'in FIG. The garbage processing tank 14 is housed in a horizontal columnar wheel 15 having a groove 124. The wheel 15 is not fixed except that the both side surfaces of the wheel 15 slide on the inner surface of the garbage processing tank 14, and the wheel 15 rolls as the garbage processing tank 14 rotates. Wheel 15
By the rolling, the arm 146 fixed from one side wall in the tank 14 extends into the garbage treatment tank 14 and is connected to the scraping plate 17 for scraping the crushed garbage attached to the inner wall surface of the tank. Piping 14 that introduces outside air C into the tank from the side wall of the tank
The exhaust gas supplied to the gas phase portion in the tank by 8 is discharged out of the system through the gap of the inlet 129. After the water content is adjusted, the semi-dried product D having a water content of about 40 to 65% by weight is extracted from the garbage processing tank 14 by the extraction pipe 101 by a method such as suction transfer, and then deposited and fermented.

[0060]

According to the present invention, when carrying out the garbage treatment,
Stirring and aeration heating a substance containing garbage and seed bacteria,
Moisture is effectively exuded and dried as the constituents are decomposed.
To give a semi-dried product with a water content suitable for sedimentary fermentation.
After that, during fermentation, the effect is
The effect that can be efficiently composted
It

[Brief description of drawings]

FIG. 1 is a basic follow-up diagram of a composting method and a composting method of a kitchen composting apparatus according to the present invention.

FIG. 2 is an explanatory view of an embodiment of a kitchen composting device and a composting method according to the present invention.

FIG. 3 is an explanatory view of an embodiment of a kitchen composting device and a composting method according to the present invention.

FIG. 4 is a plan view of the garbage processing tank in FIG.

5 is a horizontal cross-sectional view of a fermenter part including the fermenters 81 to 85 in FIG.

FIG. 6 is an explanatory diagram of an embodiment of a kitchen composting device and a composting method according to the present invention.

7 is a cross-sectional view taken along the line aa ′ of the device in FIG. 7.

[Explanation of symbols]

10 ... kitchen waste processing device, 14 ... kitchen waste processing tank, 15 ... wheel, 16 ... rotating shaft, 80 ... fermentation device, 81-85 ... fermentation tank, 121 ... storage device.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Kitahata 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Hitachi Living Products Division (72) Inventor Usaburo Yamaguchi 800-Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Hitachi, Ltd. Living Equipment Division (72) Inventor Masaei Kawashima 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Living Equipment Division, Hitachi Ltd. (56) Reference JP-A-1-167293 (JP, A) Kai 61-191585 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C05C 1/00-13/00 C05D 1/00-11/00 C05F 1/00-17/02 C05G 1/00-5/00 B09B 3/00

Claims (3)

(57) [Claims] 1. A step of subjecting a substance containing garbage and seeds to crushing, mixing, and semi-drying to give a semi-dried food, a garbage treatment ,
A method of composting garbage including a fermentation step of aerobically fermenting the garbage-treated semi-dried material after the garbage treatment step, wherein the garbage and the inoculum are treated in the garbage treatment step. A substance containing the inoculum by stirring and aeration heating the contained substance.
Composting of garbage which is characterized in that a semi-dry, such as a moisture content suitable for Piling by exudate cytoplasmic fluid from cells of該厨garbage by biochemical decomposition of the polymer hydrolase in Method. 2. The method for composting garbage according to claim 1, wherein a gas containing oxygen is aerated when the gas is heated by aeration. 3. A kitchen waste treatment tank for crushing, mixing and semi-drying a material containing garbage and inoculum to obtain a semi-dried product, and aerobically fermenting the semi-dry product treated in the kitchen waste treatment tank. And a fermenter to allow, in the kitchen waste treatment tank, stirring and aeration heating the substance containing the kitchen waste and the inoculum, the biochemical decomposition action of the polymer hydrolase in the substance containing the inoculum The kitchen composting device is provided with a stirring means and an aeration heating means for exuding the cytoplasmic liquid from the cells of the garbage to obtain a semi-dried product having a water content suitable for sedimentary fermentation.