JP2004130235A - Apparatus and method for reducing volume of waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized apparatus which reduces the volume of a waste while preventing the occurrence of dioxins and a method therefor. <P>SOLUTION: The volume reduction apparatus 1 for reducing the volume of a waste put therein is constructed by arranging, on a base 5, a container 2 for containing a waste except metal, an agitation means 3 for agitating the waste in the container 2, and a boiler 4 for supplying steam to the container 2 to moisten and pressurize, provided that the boiler 4 generates saturated steam. <P>COPYRIGHT: (C)2004,JPO

Description

【００３７】
【表２】

処理物は、炭状となるので、これを肥料として使用する場合や、飼料として使用する場合等により混入するものを変えて実験した。
表１、表２に示すように、最も時間がかかった焼却灰および廃車シュレッダの処理を行う場合でも、標準の条件で最大９０分、高圧の条件では５０分で処理を行うことができた。攪拌手段の回転速度が遅いため、運転中の騒音はほとんどなく、処理温度が低く燃焼しないため、煙の発生もない。
【００３８】
【発明の効果】
本発明によれば次の効果を奏する。
（１）本発明の廃棄物の減容装置は、廃棄物を収容する容器と、攪拌手段と、ボイラとを備え、収容された廃棄物を減容する廃棄物の減容装置において、ボイラが発生させる蒸気を、飽和蒸気とするので、容器内に細かい水滴が発生し、この水滴から静電気が発生して廃棄物中を流れ、廃棄物を破砕するので、廃棄物は、飽和蒸気の熱、圧力および静電気によって減容されることになり、小型の設備で、ダイオキシンの発生を防止しながら、廃棄物の減容処理を行うことができる。
（２）本発明の他の廃棄物の減容装置は、容器と、容器内の廃棄物を攪拌しながら摩擦によって静電気を発生させる攪拌手段と、容器内に飽和蒸気を送給するボイラとを基台上に配置して、廃棄物を減容する廃棄物の減容装置において、容器および攪拌手段に帯電性を設け、かつ基台に対して絶縁状態に設置しているので、廃棄物、容器および攪拌手段が帯電しやすくなり、静電気を流すことによって、低温での減容処理を促進させ、小型の設備で、ダイオキシンの発生を防止しながら、廃棄物の減容処理を行うことができる。
（３）容器の内壁に、静電気量を調整する導電性または絶縁性のライニングを施すと、導電性のライニングを、内周面の一部または全部に設けることにより、廃棄物から容器への電荷の移動を促進させ、また、放電箇所を調整することができる。また、逆に静電気の発生量が少ない場合には、絶縁性のライニングを施して静電気の発生量を増加させ、処理を促進することができる。このように、廃棄物の性質に応じて静電気の発生量を調整し、最適な処理を行うことができる。
（４）攪拌手段に、静電気量を調整する導電性または絶縁性のライニングを施すと、導電性のライニングを設けることにより摩擦により発生する静電気の発生量を抑え、また、絶縁性のライニングを設けて静電気の発生量を増加させることができるので、廃棄物の性質に応じて静電気の発生量を調整し、最適な処理を行うことができる。
（５）攪拌手段および容器の間に、両者の間に所定の電圧を加える電源を接続すると、攪拌手段および容器の間に、廃棄物を介して放電を行うことができ、減容処理を促進することができる。
（６）攪拌手段に、容器内に回動可能に支持された回転軸と、この回転軸に基部が設けられ、半径方向に突出した複数の支持軸と、この支持軸の先部に設けられ、支持軸とともにＴ字状に形成された板状の攪拌羽根とを設けると、突起部を増やして廃棄物との間で電流が流れやすくすることができる。また、容器の下部に滞留している廃棄物と攪拌羽根との接触面積を増やして、摩擦による静電気の発生量を増加させることができる。このようにして、減容処理を促進することができる。
（７）本発明の廃棄物の減容方法は、送給する蒸気を３００℃以下の飽和蒸気にするので、容器内での減容処理中にダイオキシンが発生することが防止され、また、静電気を廃棄物中を流すことにより廃棄物が破砕され、減容処理を促進することができる。
（８）容器に、導電性物質または絶縁性物質を投入すると、廃棄物に発生する静電気量が多くなり過ぎるときは、導電性物質を投入し、静電気量が少なくなり過ぎるときは、絶縁性物質を投入することにより、発生する静電気量を調整することができ、減容処理を最適化することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の廃棄物の減容装置の正面図である。
【図２】同廃棄物の減容装置の平面図である。
【図３】容器の正断面図である。
【符号の説明】
１　減容装置
２　容器
３　攪拌手段
４　ボイラ
５　基台
６　減速機
７　回転軸
８　投入口
９　取り出し口
１０　蒸気供給口
１１　調整器
１２　空圧弁
１３　同圧タンク
１４　蒸気排気管
１５　脱臭器
１６　蒸気吸入管
１７　安全弁放気管
１８　オイルタンク
１９　支持軸
２０　攪拌羽根[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a waste volume reducing apparatus and a volume reducing method for performing volume reduction processing of waste materials other than metals.
[0002]
[Prior art]
Conventionally, incineration work is generally performed as a method of reducing the volume of waste. Recent research has revealed that a large amount of dioxin is generated when incinerated in the range of 400 to 800 ° C. Therefore, a new incinerator is a method of burning waste at a temperature of 800 ° C or higher. Has been adopted.
[0003]
However, heating at a temperature of 800 ° C. or higher in order to prevent the generation of dioxin is wasteful of energy, and increases capital investment, labor and cost for processing. For this reason, there is a problem that a large-sized facility can only treat a large amount of waste at once.
[0004]
On the other hand, as a device for heating at a temperature of 400 ° C. or less, there is a feed boiling adjusting device described in Patent Document 1. According to this device, the feed raw material can be uniformly boiled and adjusted by stirring while supplying heated steam into the container, and the labor load on the worker can be reduced.
Here, it is conceivable to reduce the volume of waste using this boiling adjusting device.
[0005]
[Patent Document 1]
JP-A-11-18689 (Pages 2-6, FIG. 1)
[0006]
[Problems to be solved by the invention]
However, boiling alone is not enough to reform and reduce the volume of waste, and it is not possible to cope with waste treatment as it is.
[0007]
Therefore, an object of the present invention is to provide a waste volume reducing device and a volume reducing method for performing a waste volume reducing process with a small facility while preventing generation of dioxin.
[0008]
[Means for Solving the Problems]
In order to solve the above problem, a waste volume reducing device of the present invention includes a container for storing waste except metal, a stirring means for stirring waste in the container, and a steam supply device for feeding steam into the container. And a boiler for humidifying and pressurizing the stored waste, wherein the steam generated by the boiler is a saturated steam.
[0009]
The steam generated by the boiler is thrown into a container, and its temperature drops a little, and appears as fine water droplets. Static electricity is generated by collision or friction between fine water droplets. Further, the inside air is expelled by the supplied saturated steam, and the steam permeates the waste.
The static electricity accumulated in the water droplets reaches the container via waste or directly. The portion of the waste where the static electricity has flowed generates heat locally and raises the temperature, and is crushed.However, the current does not continuously flow and the amount of power is small, so the temperature rise Since the temperature is small and the average temperature in the container does not rise above the temperature of the saturated steam to be fed, dioxin is hardly generated. Further, since the container is filled with saturated steam, even if a spark is generated due to the flow of static electricity, it is prevented from being exploded by being flammable gas or the like.
Thus, the use of the heat, pressure and static electricity of the saturated steam has the effect of reducing the volume of waste.
[0010]
Another waste volume reducing device of the present invention includes a container for storing waste except metal, a stirring means for generating static electricity by friction while stirring the waste in the container, and a device for sending steam into the container. A boiler for supplying, humidifying and pressurizing is disposed on a base, and in the waste volume reducing device for reducing the volume of stored waste, the container and the stirring means have a chargeability, and It is characterized by being installed in an insulated state with respect to the base.
[0011]
Since the container and the stirring means have a charging property and are installed in an insulated state with respect to the base, the waste and the container and the stirring means have a positive or negative charge ( Static electricity) accumulates. On the other hand, heated and pressurized saturated steam is fed into the container, and the saturated steam penetrates into the waste, so that the electric resistance inside the waste is reduced, and the electricity flows easily.
[0012]
Here, having chargeability means having a large electric resistance and being capable of being charged positively or negatively with respect to waste to be put in, and may be charged either positively or negatively. In the container and the stirring means of the present invention, it is preferable to use a metal such as stainless steel having a thickness and durability sufficient to prevent damage by electric discharge. Further, the container and the stirring means may be made of the same material, but different materials may be used.
[0013]
For example, when a negative charge is accumulated in the waste, and a positive charge is accumulated in the container and the stirring means, when a certain amount of the negative charge accumulates in the waste, the electric charge passes through the inside of the waste and becomes a container. And flow to the stirring means. Since the waste is agitated, the amount of accumulated charge differs for each part, and the path and time for the charge to flow also differ. In addition, since the container is filled with the saturated vapor, the electric resistance does not become too large and the static electricity does not accumulate too much. Therefore, the static electricity is gradually discharged, and the waste is crushed while instantaneously generating heat in the discharge path during the discharge. However, since the discharge is not performed continuously, the waste does not reach a high temperature, and the temperature in the entire container does not rise significantly from the set temperature by the heated steam, and the waste suppresses the generation of dioxin. While the volume is reduced.
[0014]
Here, a conductive or insulating lining for adjusting the amount of static electricity may be provided on the inner wall of the container.
The charges generated and accumulated in the container flow to the inner peripheral surface of the container and a plurality of portions of the stirring means. Although the inside of the container is configured so that a large amount of electric charge does not accumulate due to the filled saturated vapor, the discharge may still be concentrated at a specific location in the container, and in such a case, In this case, the container may be damaged. Therefore, by providing the conductive lining on part or all of the inner peripheral surface, the transfer of electric charges from the waste to the container can be promoted, and the discharge location can be adjusted. Conversely, when the amount of generated static electricity is small, an insulating lining can be provided to increase the amount of generated static electricity, thereby facilitating the processing.
[0015]
The stirring means may be provided with a conductive or insulating lining for adjusting the amount of static electricity. For example, a rotating shaft and a stirring blade provided on the rotating shaft can be used as the stirring means. By providing a conductive lining in the stirring means, the amount of static electricity generated by friction can be suppressed, and by providing an insulating lining, the amount of static electricity can be increased.
[0016]
When a power source for applying a predetermined voltage is provided between the stirring means and the container, discharge can be performed between the stirring means and the container via waste.
[0017]
The stirring means, a rotating shaft rotatably supported in the container, a base is provided on the rotating shaft, a plurality of radially protruding support shafts, provided at the tip of the support shaft, When a plate-shaped stirring blade formed in a T-shape is provided together with the support shaft, the number of protrusions can be increased, and current can easily flow between the waste and the waste. In addition, the contact area between the waste retained in the lower part of the container and the stirring blade can be increased, and the amount of static electricity generated by friction can be increased.
[0018]
In the waste volume reduction method of the present invention, a waste container excluding metals is stored in a container, and the waste is stirred by a stirring means, and steam is fed into the container to perform humidification and pressurization. In the waste volume reducing method for reducing the volume of waste, the steam to be sent is a saturated steam of 300 ° C. or less.
By controlling the steam fed into the container to 300 ° C. or less, generation of dioxin during volume reduction processing in the container is prevented. Also, since saturated steam is sent, fine water droplets are generated when the temperature drops in the container, and the water droplets collide or rub, generating static electricity, which can flow through waste. Crushes waste and promotes volume reduction processing.
[0019]
In the waste volume reduction method of the present invention, a container having a chargeability and a stirring means are provided in an insulated state on a base, and waste except metal is stored in the container, and the waste is stirred by the stirring means, In the waste volume reducing method for reducing the volume of waste by supplying saturated steam to the container to perform humidification and pressurization, the temperature in the container is set to 300 ° C. or lower.
[0020]
The operation in which the temperature in the container is set to 300 ° C. or lower may be performed by setting the supply temperature of the saturated steam to 300 ° C. or lower. At this time, the temperature rise due to the static electricity discharge is very small, and need not be considered. Since the temperature in the container is 300 ° C. or less, the generation of dioxin is reliably suppressed.
[0021]
When a conductive substance or an insulating substance for adjusting the amount of static electricity generated in the waste is charged into the container, when the amount of static electricity generated in the waste becomes too large, a conductive substance is charged and the amount of static electricity is reduced. When the amount becomes too small, the amount of generated static electricity can be adjusted by adding an insulating material.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
(First Embodiment)
FIG. 1 is a front view of a waste volume reducing device according to a first embodiment of the present invention, and FIG. 2 is a plan view of the waste volume reducing device. As shown in FIGS. 1 and 2, a waste volume reducing device 1 of the present invention includes a container 2 for storing waste except metal, and friction between the container 2 and the waste while stirring the waste. Stirring means 3 for generating static electricity by means of water and two boilers 4 for supplying saturated steam into vessel 2 for humidification and pressurization are arranged on base 5 to reduce the volume of the stored waste. Device.
[0023]
The container 2 is made of a metal such as stainless steel, has a pressure resistance up to 8.0 MPa, and is formed in a horizontally placed barrel shape. More specifically, the central portion is formed in a cylindrical shape, and both side portions connected to the central portion are formed so as to gradually decrease in diameter toward both end portions. Reducers 6 are provided at both ends of the container 2, and the stirring means 3 is provided between the two reducers 6 so as to penetrate the inside of the container 2. The container 2 and the stirring means 3 are installed in an insulated state with respect to the base 5 via, for example, an insulating sheet.
[0024]
In the upper center of the container 2, a waste inlet 8 is provided so as to be openable and closable, and in the lower center, a waste outlet 9 after the volume reduction treatment is provided so as to be openable and closable. On both sides of the container 2, steam supply ports 10 for supplying saturated steam from the boiler 4 via a regulator 11, a pneumatic valve 12, and a steam suction pipe 16 are provided so as to be openable and closable. Further, the same pressure tank 13 for draining is connected to the steam supply port 10.
[0025]
A deodorizer 15 is connected to an upper portion of the container 2 via a steam exhaust pipe 14. The steam supplied from the boiler 4 into the container 2 via the steam suction pipe 16 is discharged from the steam exhaust pipe 14. In addition, a safety valve air release pipe 17 is provided at the upper part of the container 2, and when there is a possibility that the container 2 may be damaged due to a sudden increase in pressure, the pressure in the container 2 can be reduced from here.
[0026]
The boiler 4 is supplied with fuel from an oil tank 18. Further, water supplied via the water softener 19 and the pure water machine 20 is heated to supply pressurized steam to the container 2. Here, soft water refers to water whose hardness has been adjusted to 0 to less than 60 mg / L by removing calcium ions and magnesium ions in the water, and pure water refers to water from which impurities including silica and hardness have been removed. Say.
[0027]
The water passes through the water softener 19 and the pure water machine 20 in order, and is used after becoming pure water from which impurities have been removed. If used without removing impurities, impurities in the moisture will precipitate on the tube wall of the vessel 2 and the heating tube, etc., and will be scaled. However, by using pure water, scaling can be prevented and damage to the apparatus can be prevented. Can be prevented.
[0028]
FIG. 3 is a front sectional view of the container. As shown in FIG. 3, a rotating shaft 7 whose both ends are rotatably supported by a speed reducer 6 is provided inside the container 2. The rotating shaft 7 has four pairs of two supporting shafts 19 in the vertical direction and four pairs of two supporting shafts 19 in the left and right pair alternately in the axial direction. The bases of the 16 support shafts 19 are fixed to each other. At the tip of the support shaft 19, the center of a plate-shaped stirring blade 20 is provided, and the support shaft 19 and the stirring blade 20 form a T-shaped outer shape. The outer edge of the stirring blade 20 which is close to the inner periphery of the container 2 is formed in an arc shape to prevent a corner from colliding. It is preferable that the stirring blade 20 and the inner periphery of the container 2 are close to each other in order to prevent stagnation of waste, and are formed with a gap of about 5 mm, for example.
[0029]
The stirring blade 20 is arranged inclined with respect to the axial direction of the support shaft 19, and when the support shaft 19 is rotated in one direction, the waste in the container 2 is collected at the center in the axial direction, and the stirring blade 20 is inverted. When rotated in the direction, the waste in the container 2 is arranged to be dispersed on both sides in the axial direction.
The stirring means 3 includes the rotating shaft 7, the support shaft 19, and the stirring blade 20, and each member is formed of, for example, a charging member such as stainless steel.
A drive shaft parallel to the rotating shaft 7 is provided above the container 2, and is connected to a speed reducer 6 that supports both ends of the rotating shaft 7 via a sprocket and a chain.
[0030]
Next, a procedure for using the volume reducing device 1 will be described.
After charging the waste except metal from the charging port 8 of the container 2, the charging port 8 is closed, and then the operation of the boiler 4 is started. The temperature and pressure of the generated saturated steam are adjusted so that the temperature in the container 2 is 200 to 300 ° C. and the pressure is 1.4 to 5 MPa. The waste is preferably combustibles such as general combustible waste, fiber waste, waste paint, plastic bottles, sewage sludge, and incinerated ash, but non-combustibles such as glass fragments can also be treated.
[0031]
The heated and pressurized saturated steam is supplied to the container 2 from the steam supply port 10, and the internal saturated steam is removed from the steam exhaust pipe 14. The saturated steam fed into the container 2 permeates into the waste and replaces the gas in the container, and generates many fine water droplets. The water droplets collide with each other and generate friction, thereby generating static electricity.
The volume of the waste is reduced by pressure decomposition and hydrolysis. By rotating the stirring means 3, static electricity is generated by friction, and the static electricity generated by the friction and the static electricity accumulated in the floating water droplets are reduced. By flowing inside, the volume reduction process further proceeds. The rotation speed of the stirring means 3 is approximately 3 to 7.5 rotations / minute.
[0032]
By operating for 5 to 60 minutes in this state, the volume of waste can be reduced by about 40%.
When the amount of generated static electricity is small, it is also possible to add an insulating material that easily generates static electricity together with the waste to be reduced in volume to promote the volume reduction process. In the case where it occurs and the device is damaged, a conductive substance such as carbon powder can be added to suppress the generation of static electricity. Note that when a substance having an insulating property and a water absorbing property, such as sawdust, is added, useless water in the waste is removed to further increase the generation of static electricity, thereby facilitating the treatment.
[0033]
(Second embodiment)
The volume reduction device according to the second embodiment includes a static electricity generated by friction with waste on the inner peripheral surface of the container 2 and part or all of the stirring means 3 of the volume reduction device 1 according to the first embodiment. A conductive or insulating lining (not shown) for adjusting the amount is provided. The lining can be formed, for example, by sticking or welding a sheet-like conductive or insulating material, and by applying a conductive or insulating paint. In this way, the processing can be promoted by increasing the amount of generated static electricity, or the damage can be prevented by reducing the amount of generated static electricity.
[0034]
(Third embodiment)
The volume reducing device of the third embodiment insulates between the stirring means 3 and the container 2 of the volume reducing device 1 of the first embodiment, and applies a predetermined voltage between the stirring means 3 and the container 2. The power supply to be added is connected.
The range of the magnitude of the applied voltage may be a range in which dioxin is not generated due to a rise in temperature in the container 2. In addition, it is also possible to change the material of the container and the stirring means to a material having conductivity so that the current can easily flow.
[0035]
【Example】
Using the volume reduction device of the first embodiment, volume reduction processing of various wastes was performed. In addition, the processing amount per operation of the apparatus is about 1.5 t.
The pressure and temperature of the boiler were set to two types, standard time and high pressure, and the time until the volume reduction rate became 40% or less was measured.
[0036]
[Table 1]

[0037]
[Table 2]

Since the treated material is in the form of charcoal, the experiment was carried out by changing the contaminants depending on the case where this was used as a fertilizer or the case where it was used as a feed.
As shown in Tables 1 and 2, even when processing the incinerated ash and scrap car shredder that took the longest time, the processing could be performed in a maximum of 90 minutes under standard conditions and in 50 minutes under high-pressure conditions. Since the rotation speed of the stirring means is low, there is almost no noise during operation, and since the processing temperature is low and there is no combustion, there is no generation of smoke.
[0038]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) A waste volume reducing device according to the present invention includes a container for storing waste, a stirring means, and a boiler, and the boiler is a waste volume reducing device for reducing the volume of stored waste. Since the generated steam is saturated steam, fine water droplets are generated in the container, static electricity is generated from the water droplets, flows through the waste, and crushes the waste, so that the waste is heated by the saturated steam, Since the volume is reduced by pressure and static electricity, the volume of waste can be reduced with a small facility while preventing generation of dioxin.
(2) Another waste volume reducing device of the present invention includes a container, a stirring means for generating static electricity by friction while stirring the waste in the container, and a boiler for supplying saturated steam into the container. In the waste volume reduction device that is disposed on the base and reduces the volume of waste, the container and the stirring means are provided with charging properties, and are installed in an insulated state with respect to the base. The container and the agitating means are easily charged, and the static electricity is flown, thereby promoting a low-temperature volume reduction process. With a small facility, the waste volume reduction process can be performed while preventing the generation of dioxin. .
(3) When a conductive or insulating lining for adjusting the amount of static electricity is provided on the inner wall of the container, the conductive lining is provided on part or all of the inner peripheral surface, so that the charge from the waste to the container is reduced. And the discharge location can be adjusted. Conversely, when the amount of generated static electricity is small, an insulating lining can be provided to increase the amount of generated static electricity, thereby facilitating the processing. As described above, the amount of generated static electricity can be adjusted according to the nature of the waste, and the optimal treatment can be performed.
(4) If the stirring means is provided with a conductive or insulating lining for adjusting the amount of static electricity, the conductive lining is provided to reduce the amount of static electricity generated by friction, and the insulating lining is provided. As a result, the amount of generated static electricity can be increased, so that the amount of generated static electricity can be adjusted according to the nature of the waste, and optimal processing can be performed.
(5) When a power supply for applying a predetermined voltage between the stirring means and the container is connected, discharge can be performed between the stirring means and the container via waste, thereby facilitating the volume reduction process. can do.
(6) The stirring means is provided with a rotation shaft rotatably supported in the container, a base portion provided on the rotation shaft, a plurality of support shafts protruding in the radial direction, and provided at the tip of the support shaft. When a plate-shaped stirring blade formed in a T-shape is provided together with the support shaft, the number of protrusions can be increased, and current can easily flow between the waste and the waste. In addition, the contact area between the waste retained in the lower part of the container and the stirring blade can be increased, and the amount of static electricity generated by friction can be increased. In this way, the volume reduction process can be promoted.
(7) According to the waste volume reduction method of the present invention, since the steam to be fed is a saturated vapor of 300 ° C. or less, the generation of dioxin during the volume reduction process in the container is prevented, and the static electricity is reduced. By flowing the waste through the waste, the waste is crushed and the volume reduction treatment can be promoted.
(8) When a conductive substance or an insulating substance is put into a container, if the amount of static electricity generated in the waste becomes too large, a conductive substance is put in. If the amount of static electricity becomes too small, an insulating substance is added. , The amount of generated static electricity can be adjusted, and the volume reduction process can be optimized.
[Brief description of the drawings]
FIG. 1 is a front view of a waste volume reducing device according to a first embodiment of the present invention.
FIG. 2 is a plan view of the waste volume reducing device.
FIG. 3 is a front sectional view of the container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Volume reduction device 2 Container 3 Stirrer 4 Boiler 5 Base 6 Reduction gear 7 Rotary shaft 8 Input port 9 Extraction port 10 Steam supply port 11 Regulator 12 Pneumatic valve 13 Same pressure tank 14 Steam exhaust pipe 15 Deodorizer 16 Steam suction Pipe 17 Safety valve vent pipe 18 Oil tank 19 Support shaft 20 Stirrer blade

Claims (9)

A container for storing waste other than metal, a stirring means for stirring the waste in the container, and a boiler for supplying steam to the container to humidify and pressurize, and reduce the volume of the stored waste Waste volume reduction equipment
The steam generated by the boiler is a saturated steam. A container for storing waste excluding metal, a stirring means for generating static electricity by friction while stirring the waste in the container, and a boiler for supplying steam to the container to humidify and pressurize the base In the waste volume reduction device arranged to reduce the volume of the stored waste,
The container and the agitating means have a charging property and are installed in an insulated state with respect to the base. The waste volume reducing device according to claim 1 or 2, wherein a conductive or insulating lining for adjusting an amount of static electricity is provided on an inner wall of the container. 4. The waste volume reducing device according to claim 1, wherein the stirring unit is provided with a conductive or insulating lining for adjusting an amount of static electricity. 5. The waste volume reducing device according to any one of claims 1 to 4, further comprising a power supply for applying a predetermined voltage between the stirring means and the container. The stirring means, a rotating shaft rotatably supported in the container, a base provided on the rotating shaft, a plurality of radially protruding support shafts, provided at the tip of the support shaft, The waste volume reducing device according to any one of claims 1 to 5, further comprising a T-shaped plate-like stirring blade together with the support shaft. The waste containing metals is accommodated in a container, and the waste is stirred by a stirring means, and steam is fed into the container to perform humidification and pressurization, thereby reducing the amount of waste to reduce the volume of the waste. In the method
A method for reducing the volume of waste, wherein the steam to be sent is a saturated steam of 300 ° C. or less. The base is provided with a container having a charging property and a stirring means in an insulated state, the waste containing metal is accommodated in the container, the waste is stirred by the stirring means, and steam is fed into the container to humidify the waste. And pressurizing, in a waste volume reducing method for reducing the volume of the waste,
A method for reducing the volume of wastes, wherein the container is operated at a temperature of 300 ° C. or lower. The waste volume reducing method according to claim 7 or 8, wherein a conductive substance or an insulating substance for adjusting an amount of static electricity generated in the waste is charged into the container.

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