JP2003153998A - Method of sterilization of inside of treatment tank in waste drying/volume reduction treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of sterilization inside a treatment tank in a waste drying treatment device for easily and securely performing the sterilization treatment inside the treatment tank after the dried/reduced waste is taken out. SOLUTION: The waste in the treatment tank 1 is dried/reduced by heating and decompressing the inside of the treatment tank 1 storing the waste, and the treated waste is discharged from the treatment tank 1. After that, air, which is an obstacle in the sterilization inside the treatment tank 1, is removed while the outside of the treatment tank 1 is heated at a sterilization temperature or higher, then the inside of the treatment tank 1 is compressed by steam to a prescribed pressure to achieve the sterilization temperature and heated at high temperature for a prescribed period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sterilizing the inside of a processing tank in a waste dry volume reduction apparatus.

[0002]

2. Description of the Related Art For example, in a fast food store such as a hamburger shop, a paper container, a garbage container,
Many papers such as paper napkins are discharged as garbage and are thrown into the garbage bag. In this case, when the garbage bag is full,
You can take out the full garbage bag and replace it with a new one. Such exchanging of garbage bags will be frequently performed in proportion to the comings and goings of customers. If the garbage bags are frequently replaced, it is necessary to secure a storage place for a large amount of garbage bags. In addition, the cost required for the municipalities to collect a full garbage bag will be large.

[0003] Therefore, recently, there is provided a dust storage chamber provided with a heating means and a stirring blade inside, and the dust stored in the dust storage chamber is heated while stirring to dry and reduce the volume of the waste. Many devices have been proposed.

[0004]

However, in the above-mentioned conventionally proposed waste drying / volume-reducing apparatus, even the sterilization is not intended, and therefore, the operation is stopped after the dried processed product is taken out. However, there was a problem that various bacteria would propagate in the treatment tank of the waste drying treatment equipment.

An object of the present invention is to sterilize the inside of a treatment tank in a refuse drying treatment apparatus, which makes it possible to easily and surely perform the sterilization treatment inside the treatment tank after taking out the treated product of the dry volume-reduced waste. To provide a method.

[0006]

The constitution of the present invention which achieves the above object is as follows. The invention according to claim 1 heats and depressurizes the inside of the treatment tank containing the waste to dry and reduce the volume of the waste in the treatment tank, discharge the treated product from the treatment tank, and then With the outside heated to a sterilization temperature or higher, remove air that is an obstacle to sterilization in the treatment tank, and then steam-pressurize the inside of the treatment tank to a predetermined pressure at which the sterilization temperature can be obtained. It is characterized in that the inside of the time treatment tank is heated to a high temperature.

In this way, after the waste in the processing tank is dried and volume-reduced and the processed product is discharged from the processing tank, the inside of the processing tank is sterilized at the sterilization temperature while the outside of the processing tank is heated to the sterilization temperature. Since the steam is pressurized to a predetermined pressure at which the above pressure can be obtained, the predetermined pressure can be maintained without overheating the steam. Then, since the high temperature heating in the treatment tank is performed for a predetermined time after the air which is an obstacle to the sterilization in the treatment tank is removed, the bacteria in the treatment tank are surely sterilized by the heat of the steam.

According to the second aspect of the invention, in order to remove the air which is an obstacle to sterilization in the treatment tank according to the first aspect, the inside of the treatment tank is decompressed, and then steam is put into the treatment tank. It is characterized in that it is performed by repeating the operation of returning to atmospheric pressure.

By doing so, it is possible to easily and surely eliminate the air which is an obstacle to sterilization in the processing tank.

According to the third aspect of the present invention, in order to remove air which is an obstacle to sterilization in the treatment tank according to the first aspect, steam is put into the treatment tank to pressurize the inside of the treatment tank and then the treatment is performed. It is characterized in that it is performed by repeating the operation of reducing the pressure in the tank and returning it to atmospheric pressure.

By repeating such pressurization and depressurization,
Condensed water at the bottom of the processing tank boils under reduced pressure and pushes out the surrounding air, so that air that is an obstacle to sterilization in the processing tank can be easily and surely removed.

According to the invention described in claim 4, in order to remove the air which is an obstacle to sterilization in the processing tank according to claim 1, the inside of the processing tank is decompressed, and then steam is put into the processing tank. It is characterized by performing an operation of returning to atmospheric pressure and an operation of putting steam into the processing tank to pressurize the inside of the processing tank, and then depressurizing the inside of the processing tank to return to atmospheric pressure.

By doing so, it is possible to easily and surely remove the air in the bottom portion or the corner portion of the processing tank, which is an obstacle to sterilization in the processing tank and which is relatively difficult to remove.

According to the invention of claim 5, claim 1
After heating the inside of the processing tank at a high temperature for the predetermined time described in [1], the inside of the processing tank is depressurized.

By doing so, the inside of the wet treatment tank which has been sterilized by being heated to a high temperature by steam is dried by the reduced pressure in the treatment tank and the heat from the outside of the treatment tank. Even if the lid of the processing tank is opened after the processing, steam does not spout, and the work can be made safe.

According to the invention of claim 6, claim 5
The depressurization in the treatment tank described in 1 above is performed in a state where the outside of the treatment tank is heated to a high temperature.

By doing so, the evaporation of water in the treatment tank is promoted, and the drying time in the wet treatment tank which has been sterilized by being heated to a high temperature by steam can be shortened.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a sterilizing method in a processing tank in a refuse drying and reducing apparatus according to the present invention will be described. First, the inside of the treatment tank containing the waste is heated and decompressed, the waste in the treatment tank is dried and volume-reduced, and the treated material is discharged from the treatment tank, and the outside of the treatment tank is sterilized at a temperature higher than that. In the state of being heated to the temperature of 1, the air which is an obstacle to sterilization in the processing tank is removed. In the removal of this air, in the present example, after depressurizing the inside of the processing tank to about -0.09 MPa, steam is injected into the processing tank to return to atmospheric pressure, and the inside of the processing tank is again set to about -0. After reducing the pressure to 09 MPa, steam is introduced into the treatment tank. Repeat this operation. The number of times of this operation is not particularly limited, but it is performed at least until the air which is an obstacle to sterilization in the processing tank is removed.

After the air in the processing tank is removed in this way, the inside of the processing tank is steam-pressurized to a predetermined pressure at which the sterilization temperature is obtained, and the inside of the processing tank is heated at a high temperature for a predetermined time. In this example, after the air in the treatment tank is removed as described above, steam is further introduced into the treatment tank and pressurized so that the temperature in the treatment tank becomes the sterilization temperature (115 ° C to 135 ° C). And the heating is continued for a required time (in the case of the temperature, about 3 minutes to 20 minutes) with respect to the pressing temperature.

By doing so, it is possible to surely kill the various bacteria in the treatment tank by the heat of the steam.

In this example, after the sterilization treatment in the treatment tank is further performed as described above, the pressure inside the treatment tank is reduced. As a result, the inside of the wet processing tank is dried by the decompression inside the processing tank and the heat from the outside of the processing tank, and even if the lid of the processing tank is opened after the processing, steam does not spout and the work can be performed safely. be able to. At this time, if the depressurization in the processing tank is carried out in a state where the outside of the processing tank is heated to a high temperature, the evaporation of water in the processing tank is promoted, the steam is heated to a high temperature and sterilized and is in a wet state. The drying time in the processing tank can be shortened.

In the present example, as a means for eliminating air which is an obstacle to sterilization in the treatment tank, the pressure inside the treatment tank is reduced, and then steam is put into the treatment tank to return to atmospheric pressure. However, the present invention is not limited to this. It is possible to repeat the operation of putting steam into the processing tank to pressurize the inside of the processing tank, and then depressurize the inside of the processing tank to return it to atmospheric pressure. Well, depressurize the treatment tank,
After that, the operation may be performed by putting steam into the processing tank and returning it to atmospheric pressure, or by putting steam into the processing tank and pressurizing the inside of the processing tank, and then depressurizing the inside of the processing tank and returning to atmospheric pressure. Good.

Next, an example of the dust drying volume reducing apparatus for carrying out the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a partially omitted vertical sectional view of a waste drying and volume reducing apparatus for carrying out the present invention, FIG. 2 is a plan view of the processing tank shown in FIG. 1, and FIG. 3 is a vertical sectional view of the processing tank.

The waste drying and volume reducing apparatus of this embodiment penetrates through the center of a bottomed cylindrical processing tank 1 provided with a heating means 2 and a bottom portion 1a of the processing tank 1 and a tip of which projects into the processing tank 1. The rotating shaft 3, the rotary drive source 4 for rotating the rotating shaft 3 outside the processing tank 1, and the bottomed cylindrical shape so as to accommodate the waste to be processed, can be attached to and detached from the processing tank 1. The bucket 5 accommodated in the bucket 5 and the bottom portion 5a in the bucket 5 are detachably connected to the tip of the rotating shaft 3 and rotate to stir and crush the dust contained in the bucket 5. A stirring blade 6 that constitutes a stirring means, a lid 7 that closes the opening 1b of the processing tank 1, a decompression means 8 that decompresses the inside of the processing tank 1, and a bucket 5 that is detachably accommodated in the processing tank 1.
A steam introducing means 9 for introducing steam into the inside is provided.

In the heating means 2 of the treatment tank 1, the treatment tank 1 has a double structure of an inner cylinder wall 1c and an outer cylinder wall 1d having a common bottom 1a, and the inner cylinder wall 1c and the outer cylinder wall 1c are externally arranged. A heat source chamber 11 is formed by sealing the tip with the cylindrical wall 1d with a sealing material 10, and the internal space between the inner cylindrical wall 1c and the outer cylindrical wall 1d. Then, in the processing tank 1, a heat source supply passage 12 for supplying a heat source to the heat source chamber 11, and a heat source chamber 11
A heat source discharge passage 13 for discharging the heat source passing through is connected, and the heat source supply passage 12 is connected to a boiler (not shown).

Although steam is used as the heat source in this example, the heat source may be hot water. Also, processing tank 1
As the heating means 2 of the above, although not shown, an electric heater is embedded in the cylindrical wall of the treatment tank 1 or the treatment tank 1
It may be configured by winding an electric heater around the outer circumference of the cylinder wall. Further, the heating means 2 of the processing tank 1 does not necessarily have to be provided in the processing tank 1 as in this example, and another heating means may be separately installed.

A vacuum pump 14 is provided in the processing tank 1.
The vacuum evacuation passage 15 connected to the above is connected, and constitutes the decompression means 8 for decompressing the inside of the processing tank 1. Also,
A steam passage 16 connected to a boiler (not shown) is connected to the processing tank 1, and constitutes steam introducing means 9 for introducing steam into the processing tank 1. The boiler to which the steam passage 16 is connected is the heating means 2 of the treatment tank 1.
The same boiler as that for supplying the heat source to the heat source chamber 11 may be used, and in this case, the heat source discharge passage 13 and the steam passage 16 for discharging the heat source passing through the heat source chamber 11.
May be connected so that the steam discharged from the heat source discharge passage 13 is introduced into the processing tank 1 from the steam passage 16.

The processing tank 1 constructed as described above is fixed to the housing 17 with the opening 1b thereof facing upward, with the central axis inclined with respect to the vertical line (for example, about 45 °). .

The lid 7 for closing the opening 1b of the processing tank 1 is supported by a guide rail (not shown) provided on the housing 17 and is attached to the opening surface of the opening 1b of the processing tank 1. The opening 1b of the processing tank 1 can be closed in an airtight manner by moving in parallel to the above. A movement for opening and closing the lid 7 is performed by a sprocket 19 rotated by a motor 18.
The lid 7 is attached to the chain 20 suspended by the motor 20 and is driven by a motor 18.

The bucket 5 detachably accommodated in the processing tank 1 has a handle 21 attached to its opening. The handle 21 has a height such that when the bucket 5 is housed in the processing tank 1, the handle 21 does not extend outside from the opening 1b of the processing tank 1. Further, on the inner surface of the bucket 5, there is provided a protrusion 22 that serves as a resistor for dust that tends to slip and co-rotate with the inner surface of the bucket 5 due to the rotation of the stirring blade 6, to enhance the crushing effect.

The stirring blade 6 for stirring and crushing the dust in the bucket 5 is detachably connected to the tip 3a of the rotary shaft 3 projecting from the center of the bottom portion 1a of the processing tank 1 into the processing tank 1. And a plurality of blades 24 radially protruding from the boss portion 23 at equal intervals in the circumferential direction.

The boss portion 23 is detachably fitted to the end 3a of the rotary shaft 3 projecting into the processing tank 1 at one end face thereof, and the rotation of the rotary shaft 3 is transmitted to the boss portion 23. A connecting hole 23a is formed, and an end portion where the fitting connecting hole 23a is formed penetrates through the center of the bottom portion 5a of the bucket 5, and is rotatably attached via a bearing 25. In the fitting connection hole 23a formed in the end 3a of the rotating shaft 3 and the end surface of the boss portion 23, the end 3a of the rotating shaft 3 is formed in a prism, and the fitting connecting hole 23a is formed in the rotating shaft 3.
Is formed in a square hole corresponding to the tip 3a of the.

As described above, the bucket 5 provided with the stirring blades 6 on the bottom portion 5a is detachably accommodated in the treatment tank 1. When the bucket 5 is accommodated in the treatment tank 1, the treatment tank 1 is
A predetermined gap S is formed between the inner surface of the bucket and the outer surface of the bucket 5. A predetermined gap S is maintained between the inner surface of the processing tank 1 and the outer surface of the bucket 5, and the tip 3a of the rotating shaft 3 protruding into the processing tank 1 is provided.
A guide / spacer 26 for aligning the boss portion 23 of the stirring blade 6 provided in the bucket 5 is provided. The guide / spacer 26 does not necessarily have to be provided on the inner surface of the processing tank 1, but may be provided on the outer surface of the bucket 5.

Further, since the gap S is formed between the inner surface of the processing tank 1 and the outer surface of the bucket 5 as described above, the radiant heat transfer is dominant in the heat transfer from the processing tank 1 to the bucket 5. Therefore, on the inner surface of the processing tank 1 and the outer surface of the bucket 5,
A coating that promotes radiation is applied to improve the emissivity and increase the amount of heat transfer. As radiation paint, Okitsumo Color Flon 10F-4 (manufactured by Okitsumo Co., Ltd.)
Is used.

In the processing of waste by the waste drying and volume reducing device thus constructed, the waste is put into the bucket 5 housed in the processing tank 1 and the motor 18 is driven to cover the lid 7. It is moved in the closing direction to close the opening 1b of the processing tank 1, and in this state, the rotary drive source 4 is driven to drive the bucket 5
While stirring the dust by rotating the stirring blade 6 in the inside, the steam serving as the heat source of the heating means 2 is sent from the heat source supply passage 12 to the heat source chamber 11 of the processing tank 1, and the vacuum pump 1 of the decompression means 8 is supplied.
4, the inside of the processing tank 1 is evacuated to reduce the pressure.

As a result, the dust in the bucket 5 is heated in a depressurized state while being agitated and crushed by the stirring blade 6, and the evaporation of water in the dust is promoted due to the decrease in the saturation temperature due to the depressurization. The waste inside is subjected to dry volume reduction processing, and the processed material is discharged from the bucket 5.

In this way, when the processed material is discharged from the bucket 5, steam serving as a heat source of the heating means 2 is sent from the heat source supply passage 12 to the heat source chamber 11 of the processing tank 1 to be pressurized, and the temperature of the heat source chamber 11 is increased. The outside of the processing tank 1 is heated to a sterilization temperature (115 ° C to 135 ° C) or higher, and in this state, the inside of the processing tank 1 is -0.0 with the vacuum pump 14 of the pressure reducing means 8.
After reducing the pressure to 9 MPa, steam is introduced into the processing tank 1 from the steam passage 16 constituting the steam introducing means 9 to return the inside of the processing tank 1 to atmospheric pressure, and the inside of the processing tank 1 is again vacuum pump 14.
After the pressure is reduced to −0.09 MPa by means of steam, steam is introduced into the processing tank 1 from the steam passage 16 and returned to atmospheric pressure. After performing this operation at least until the air which becomes an obstacle to sterilization in the treatment tank 1 is removed, the steam in the treatment tank 1 is continuously introduced and pressurized, and the temperature in the treatment tank 1 becomes the sterilization temperature (115 ℃
Up to 135 ° C.), and the inside of the bucket 5 is heated at a high temperature for 3 to 20 minutes. As a result, it is possible to surely kill the bacteria in the processing tank 1 (including the bucket 5) by the heat of the steam.

After the high temperature heating in the processing tank 1 is completed as described above, the inside of the processing tank 1 is evacuated by the vacuum pump 14 of the pressure reducing means 8 to reduce the pressure. As a result, the inside of the wet treatment tank 1 that has been sterilized by being heated to a high temperature by steam is dried by the reduced pressure in the treatment tank 1 and the heat from the outside of the treatment tank 1, so that the treatment tank after the treatment is processed. Even if the lid 7 of 1 is opened, steam does not spout, and the work can be performed safely.

At this time, the pressure inside the processing tank 1 is reduced by sending steam serving as a heat source of the heating means 2 from the heat source supply passage 12 to the heat source chamber 11 of the processing tank 1 to heat the outside of the processing tank 1 to a high temperature. In the state, the evaporation of water in the treatment tank 1 is promoted, and the drying time in the wet treatment tank 1 which is heated to a high temperature by steam and sterilized can be shortened.

The above-mentioned waste drying and volume reducing apparatus for carrying out the present invention has the bucket 5 for containing the waste in the processing tank 1.
Although the bucket 5 is not necessarily required, and although not shown, a stirring means is provided in the bottom portion 1a of the processing tank 1 to directly store the waste inside the processing tank 1. It may be configured as described above.

[0041]

As described above, according to the method for sterilizing the inside of the processing tank in the waste drying volume reduction processing apparatus according to the present invention, the dried volume-reduced processed material and various bacteria in the processing tank can be surely killed. In addition, in carrying out the sterilization method, there is an effect that the mechanism provided in the refuse dryness volume reduction apparatus can be used as it is without requiring a special apparatus.

[Brief description of drawings]

FIG. 1 is a partially omitted vertical cross-sectional view showing an example of a waste drying and volume reducing apparatus embodying the present invention.

FIG. 2 is a plan view of the processing tank shown in FIG.

FIG. 3 is a vertical cross-sectional view of a processing tank housed in the processing tank shown in FIG.

[Explanation of symbols]

1 processing tank 1a bottom 1b opening 1c Inner tube wall 1d outer wall 2 heating means 3 rotation axes 3a Tip of rotating shaft 4 rotary drive source 5 buckets 5a bottom 6 stirring blades 7 lid 8 decompression means 9 Steam introduction means 10 Seal material 11 heat source room 12 Heat source supply passage 13 Heat source discharge passage 14 Vacuum pump 15 Vacuum passage 16 steam passage 17 housing 18 motor 19 sprocket 20 Chien 21 handle 22 protrusion 23 Boss 23a Mating connection hole 24 wings 25 bearings 26 Guide and spacer S gap

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F26B 9/06 B09B 3/00 303M 25/00 ZAB (72) Inventor Hitoshi Takei 7 Horie-cho, Matsuyama-shi, Ehime Prefecture Address Miura Kogyo Co., Ltd. Company F-term (reference) 3L113 AA07 AB02 AC05 AC08 AC24 AC58 AC67 AC85 DA22 4C058 AA24 BB05 4C341 LL13 4D004 AA03 CA42 CA46 CB31 CC01

Claims (6)

[Claims] 1. The inside of the treatment tank containing the waste is heated and decompressed, the waste in the treatment tank is dried and volume-reduced, and the treated material is discharged from the treatment tank, and the outside of the treatment tank is sterilized at a sterilization temperature. Alternatively, in a state of being heated to a temperature higher than that, after eliminating air that is an obstacle to sterilization in the treatment tank, steam is pressurized to a predetermined pressure at which the sterilization temperature is obtained in the treatment tank, and the treatment tank is kept for a predetermined time. A high temperature heating method for sterilizing the inside of a treatment tank in a waste drying and volume reduction apparatus. 2. The removal of air, which is an obstacle to sterilization in the treatment tank, is carried out by repeating the operation of depressurizing the treatment tank, then introducing steam into the treatment tank and returning to atmospheric pressure. A method for sterilizing the inside of a processing tank in the waste dry volume reduction processing apparatus according to claim 1. 3. The removal of air which is an obstacle to sterilization in the treatment tank is repeated by putting steam into the treatment tank to pressurize the inside of the treatment tank and then depressurize the inside of the treatment tank to return to atmospheric pressure. The method for sterilizing the inside of a processing tank in the waste dry volume reduction processing apparatus according to claim 1, wherein 4. The elimination of air which is an obstacle to sterilization in the treatment tank is carried out by depressurizing the treatment tank, then putting steam into the treatment tank to return to atmospheric pressure, and putting steam into the treatment tank. The method for sterilizing the inside of the processing tank in the waste drying volume reduction apparatus according to claim 1, wherein the method is performed by pressurizing the inside of the processing tank and then depressurizing the inside of the processing tank to return to atmospheric pressure. 5. The method for sterilizing the inside of the treatment tank of the waste drying volume reducing apparatus according to claim 1, wherein the inside of the treatment tank is decompressed after the inside of the treatment tank is heated to a high temperature for the predetermined time. 6. The sterilization method in the treatment tank of the waste dry volume reduction treatment apparatus according to claim 5, wherein the depressurization in the treatment tank is performed while the outside of the treatment tank is heated at a high temperature.