JP2002186941A - Waste treatment equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight and the cost of an equipment frame. SOLUTION: A right side surface plate 11 and a left side surface plate 12 of the side walls of a treatment tank 10 are also served as an equipment frame to solve the problem that a conventional aluminum equipment frame bears the weight of a treatment tank 10 and a base material 14 to increase the weight of equipment frame, the total weight of equipment, and the cost of material and manufacturing. The reduction of frame member reduces the number of component parts and improves the yield ratio of material to reduce its weight and cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste treatment apparatus for decomposing waste (organic matter) such as kitchen waste.
In particular, it relates to the structure of an apparatus frame.

[0002]

2. Description of the Related Art Conventionally, there has been known a waste treatment apparatus for decomposing waste such as kitchen garbage by utilizing the ability of decomposing microorganisms.

[0003] In a conventional waste treatment apparatus, a framework is formed by forming a hexahedron with a frame structure such as an aluminum frame for the purpose of supporting a treatment tank for decomposing waste, and an exterior member is attached to the framework. It was.

[0004]

However, in the case of the above-described prior art, the following problems have occurred.

In a waste treatment apparatus, a drive motor for rotating a stirring blade in a treatment tank is driven and controlled by a control unit, and the waste and the base material are agitated for a certain period of time at a predetermined time interval. The base materials are mixed to perform the decomposition treatment of the waste.

However, when the water content of the waste increases, the base material changes into a dumpling body, a stirring torque is required, a load is applied to the drive motor, the base material weight is increased, and the distortion of the treatment tank is increased.

For this reason, a waste treatment apparatus needs to have sufficient rigidity to withstand any substrate state.
Until now, in order to secure rigidity, the frame was made of an angle material or the like, and a structure for supporting the load was adopted.

Therefore, the weight of the device frame increases,
There has been a problem that the total cost of the apparatus is increased and the material cost and the processing cost are increased.

Therefore, there has been a demand for a structure of an apparatus frame which has a small number of components, improves the yield of materials, and has both light weight and low cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a waste treatment apparatus for reducing the weight and cost of an apparatus frame.

[0011]

In order to achieve the above object, according to the present invention, there is provided a treatment tank for stirring input waste and decomposing the waste, And a stirring shaft for transmitting a driving force to stirring means for stirring the mixture in the processing tank, wherein the side wall of the processing tank also serves as an apparatus frame.

[0012] The side cross-sectional shape is U-shaped, and the mixture containing the inputted waste is agitated, a treatment tank for decomposing the waste, and the mixture of the base material and the waste contained in the treatment tank are stirred. A stirring means, a stirring shaft which is pivotally supported on the processing tank side wall and transmits a driving force to the stirring means, an input port for inputting waste into the processing tank, and an input lid for opening and closing the input port, Wherein the side wall of the processing tank also serves as an apparatus frame.

A side cross-sectional shape is U-shaped, and a treatment tank for stirring the inputted waste and decomposing the waste, and a stirring means for stirring a mixture of the base material and the waste contained in the treatment tank. A stirring shaft that is rotatably supported by the side wall of the processing tank and transmits a driving force to the stirring means, an input port that inputs waste into the processing tank, an input lid that opens and closes the input port, and the processing tank. Heating means for heating the mixture inside, an intake port for taking in outside air into the processing tank, an exhaust port for exhausting gas in the processing tank, and a removable dust filter for preventing external leakage of fine powder, A waste fan having a ventilation fan communicating with the intake port or the exhaust port to ventilate the inside of the processing tank, wherein the side wall of the processing tank also serves as an apparatus frame.

The side wall of the processing tank is preferably a reinforced flat plate.

It is preferable that the side wall of the processing tank is a flat plate partly bent and reinforced.

It is preferable that a plurality of holes are formed in the side wall of the processing bath for fitting a processing bath main body having a U-shaped side sectional shape.

It is preferable that the side wall of the processing tank is disposed with a gap from an exterior member of the apparatus.

[0018]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The materials, shapes, relative arrangements, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

An embodiment will be described with reference to FIGS.

FIG. 1 is a perspective view showing the configuration of the waste disposal apparatus according to the embodiment. FIG. 2 is a partially cut-away view of the configuration of the waste disposal apparatus according to the embodiment as viewed from the side. 3A and 3B are enlarged views showing portions A and B in FIG. FIG. 4 is a perspective view showing the entire structure of the apparatus frame of the waste disposal apparatus according to the embodiment. FIG.
FIG. 7 is a perspective view showing a structure of a processing tank of another example according to the embodiment. FIG. 6 is a perspective view showing the appearance of the waste disposal apparatus according to the embodiment.

In the figure, a drive motor 1 as a power source for stirring is arranged at a lower portion of the apparatus, and an output shaft 2 protrudes from the drive motor 1. A small sprocket 3 is fixed to the tip of the output shaft 2, a chain 4 meshes with the small sprocket 3, and the chain 4 further meshes with a large sprocket 5.

A stirring blade 6 as stirring means for stirring the waste is provided in the processing tank 10, and a stirring shaft 7 transmits a driving force to rotate the stirring blade 6. The stirring shaft 7 is supported by right bearings 8 and left bearings 9 arranged on side plates 11 and 12 serving as side walls of the processing tank 10.

The treatment tank 10 rotates the stirring blade 6 to treat waste. The processing tank 10 has a configuration in which side plates 11 and 12 are fixed to a main body plate 13 which is a one-piece processing tank body bent into a U-shape whose side cross-sectional shape is a substantially semicircular arc. In the treatment tank 10, a base material 14 for decomposing waste is put.

The right side plate 11 and the left side plate 12 of the processing tank 10
Are supported by the lower frame 15 and are also supported by the upper frame 16. The processing tank 10 (main body plate 13) is supported by the right side plate 11 and the left side plate 12.

As shown in FIG. 2, a substrate state measuring sensor 17 for detecting the state of the substrate 14 is provided on a side surface of the processing tank 10. Further, the outer periphery of the processing tank 10 is covered with a planar heater 18 as heating means for heating the processing tank 10.

A ventilation fan 19 for supplying oxygen to microorganisms in the treatment tank 10 and for venting moisture and carbon dioxide gas generated by the decomposition treatment is provided at the upper part of the apparatus. An intake port 20 for taking in outside air into the processing tank 10 is provided in the side plate 12, and an exhaust port 21 for communicating the inside of the processing tank 10 with the outside via a ventilation fan 19 is provided to protrude upward.

The upper frame 16 has a charging lid 2 for the processing tank 10.
2 are provided. When the charging lid 22 is opened, the charging port 23 for charging the waste is opened, and the waste can be charged into the processing tank 10.

A control unit 24 for controlling the entire apparatus is provided on the right side of the processing tank 10. The control unit 24 controls the drive motor 1, the substrate state measurement sensor 17, the planar heater 18, the ventilation fan 19, and the like. The measurement result of the base material state measurement sensor 17 is fed back to the control unit 24.

As shown in FIG. 6, the periphery of the processing tank 10 is surrounded by an exterior member 25, and the entire apparatus is covered.

Next, the operation and operation of the waste disposal apparatus configured as described above will be described. The processing tank 10 has a stirring shaft 7 in the center, and a base material 14 is contained therein.

The base material 14 carries treated microorganisms, and is a sawdust mainly composed of fibrous material which is hardly biodegradable, and each particle is porous, has water absorption and voids, and has a granular shape. Complex and large voids are formed between the particles. Oxygen can be supplied to the treated microorganisms by the voids, thereby improving the efficiency of the waste decomposition treatment.

At this time, the treated microorganisms for decomposing the waste in the mixture of the base material 14 and the waste are aerobic microorganisms and bacteria.

By agitating and mixing the waste put together with the substrate 14 in the treatment tank 10, the waste is decomposed.

The stirring of the substrate 14 and the waste in the treatment tank 10 is performed by the rotation of the stirring blade 6 during operation. The rotation of the stirring blade 6 was such that the power transmitted from the drive motor 1 to the output shaft 2 was transmitted from the small sprocket 3 to the large sprocket 5 via the chain 4, and the stirring shaft 7 was rotated to be attached to the stirring shaft 7. The stirring blade 6 is rotating.

In the stirring operation after the introduction of the waste, for example, the stirring is usually performed for 5 minutes during the cycle of 30 minutes, but immediately after the introduction of the waste, the stirring is started immediately. By stirring for a minute, the input waste can be finely crushed and the base 14 and the waste can be mixed evenly.

In addition to the mixing effect of the base material 14 and the waste, the stirring can stabilize the temperature of the mixture and actively scatter the water contained in the mixture to the outside of the mixture. Become. In other words, stirring also has the effect of adjusting the water content of the mixture.

Further, since the input waste is decomposed within 24 hours, the magnet M provided on the input lid 22 is connected to the input lid 22 by the input lid open / close detection sensor W provided on the upper frame 16. When the opening is not detected for 24 hours or more and the waste is not supplied for 24 hours or more, the power supply to the drive motor 1 required for stirring is stopped by stopping the stirring cycle for 5 minutes with a 1-hour cycle for 5 minutes. Power consumption can be reduced.

[0038] In this stirring cycle, when the waste is next charged, the stirring cycle returns to the initial stirring cycle in which the stirring is performed for 10 minutes in a 30-minute cycle and stopped for 20 minutes. Repeat cycle.

The stirring means at this time has a structure in which a plurality of rod-shaped stirring blades 6 (stirring rods) are attached to the stirring shaft 7 at equal intervals. It is also possible to attach with. In addition, the cross section is 3
A plurality of angular stirring blades 6 may be attached at equal intervals.

Here, the side sectional shape of the processing tank 10 is
As shown in FIG. 2, it has a U-shape having a substantially semicircular arc so that the whole of 4 is uniformly stirred with a light action. A stirring shaft 7 is provided in the horizontal direction so as to coincide with the center of the arc of the arc portion. A plurality of stirring blades 6 are fixed to the stirring shaft 7 at equal intervals.

Further, since water and carbon dioxide gas are generated during the stirring more than when the stirring is stopped, the amount of ventilation of the ventilation fan 19 is increased, and simultaneously with the supply of oxygen from the intake port 20, the moisture generated by decomposition is increased. By discharging carbon dioxide to the outside of the processing tank 10, the mixture in the processing tank 10 can be prevented from becoming humid. That is, the ventilation by the ventilation fan 19 also has the effect of adjusting the water content of the mixture.

In the present embodiment, the ventilation fan 19 is installed in the exhaust duct 26 communicating with the exhaust port 21 in this embodiment.
The same effect can be obtained even if 9 is attached.

The ventilation fan 1 attached to the intake port 20
9 may be a hot air fan capable of sending air heated from 60 ° C. to 80 ° C. into the processing tank 10. By attaching a hot air fan to the intake port 20, the temperature of the gas in the processing tank 10 can be increased. Since the amount of saturated water contained in the gas increases as the temperature of the gas in the processing tank 10 increases, if the ventilation flow rate per hour is the same, more water in the mixture is obtained in a shorter time from the processing tank 10. You can go outside. The installation of the hot air fan to the intake port 20
It is effective as a means for adjusting the water content of the mixture when the mixture becomes humid.

The exhaust duct 2 communicating with the exhaust port 21
The same effect as described above can be obtained by providing a configuration in which the ventilation fan 19 is provided in the inside 6 and the hot air fan is provided in the intake port 20.

Here, it is also possible to control the stirring operation time in accordance with the result measured by the substrate condition measuring sensor 17. For example, the intermittent operation time of the stirring is usually 5 minutes during the 30-minute cycle. However, when the substrate state is a little dry, it is necessary and sufficient to set it to 2 minutes during the 30-minute cycle. It is possible to prevent the substrate 14 from being crushed due to excessive stirring as the stirring time, and to extend the life of the substrate 14.

Further, by adjusting the stirring cycle and the exhaust flow rate according to the result measured by the substrate state measuring sensor 17, it becomes possible to adjust the water content of the mixture of the substrate 14 and the waste.

When the inside of the processing tank 10 performing the above-described stirring operation becomes humid, anaerobic bacteria grow and generate hydrogen sulfide and the like, and the odor state becomes malodorous. It is desirable to adjust the mixture to have a water content in the range of 20% to 60%.

Further, when the amount of water increases, the torque required for stirring increases, and the power is unreasonable. When the base material 14 is finely divided, the base material 14 tends to become clay-like when containing water. .

When the base material 14 becomes clay-like, the decomposition efficiency becomes extremely low. Therefore, in such a case, it is necessary to replace the base material 14 in all or half or more.

Here, the substrate state measuring sensor 17 is
A pair of electrodes is brought into direct contact with the base material 14 in the processing tank 10,
In this method, a voltage is applied between a pair of electrodes, a current flowing through a mixture of the substrate 14 and the waste is measured, and the moisture content of the substrate is measured.

Since the mixture of the base material 14 and the waste material changes to weakly alkaline or weakly acidic depending on the type of waste to be charged, the material constituting the electrode that directly contacts the mixture is as follows:
It is good to use stainless steel excellent in acid resistance and alkali resistance. In this embodiment, versatile and inexpensive stainless steel screws are used as electrodes.

On the other hand, when the input of waste is interrupted or the input amount is reduced, the substrate 14 may be excessively dried due to stirring or the like. In this case, the microorganisms in the substrate 14 are not only activated slowly due to drying, but the treatment efficiency is lowered. In addition, when the substrate 14 is pulverized, the microorganisms are scattered and contaminate the surroundings. Further, at this time, bacteria mixed in the fine powder are also scattered, which is not preferable for safety and health.

In such a case, the above-mentioned disadvantage is solved by preventing the fine powder from being discharged outside by a dust filter 27 provided in an exhaust duct 26 communicating between the inside of the processing tank 10 and the exhaust port 21. I can make up for it.

The dust filter 27 is mechanically engaged with the exhaust port 21 or is detachably fixed with a thumb screw or a snap lock, so that the dust filter 27 can be removed manually without using an instrument. By removing the dust filter 27, the fine powder of the base material 14 attached to the dust filter 27 can be easily cleaned.

A frame structure for supporting the treatment tank 10 of the waste treatment apparatus according to the present embodiment as described above will be described.

As shown in FIG. 4A, the frame structure of the waste disposal apparatus according to the present embodiment is
1, a left side plate 12, a lower frame 15, and an upper frame 16. Outside the right side plate 11, a right bearing 8 for the stirring shaft 7 for stirring the base material 14 and the large sprocket 5 are arranged at the center, and a space S where the drive motor 1 and the small sprocket 3 can be arranged below the processing tank 10. Is configured.

The right side plate 11 and the left side plate 12 are
The main body plate 13 and the upper frame 16 are supported, and there are no other supporting members. That is, in the present embodiment, the processing tank 1
The right side plate 11 and the left side plate 12, which are the side walls of the O, also serve as the apparatus frame. Conventionally, the apparatus frame is constituted by an aluminum frame or the like. This solves the problem of increasing the weight and increasing the total weight of the device and the problem of increasing material and processing costs.

For this reason, the waste disposal apparatus according to the present embodiment can reduce the number of parts by reducing the number of frame members, improve the yield of materials, and have both light weight and low cost.

The plates (the right side plate 11 and the left side plate 12) on the side walls of the processing tank are flat, and are composed of flanges 11a and 12a and side plates 11b and 12b. Collar 11a,
Reference numeral 12a is for bending reinforcement, and has a structure capable of securing necessary strength by being combined with the lower frame 15 and the upper frame 16. Furthermore, by adding reinforcement such as a convex shape that is parallel, perpendicular, or oblique to the side surface of the processing tank 10, the thickness of the right side plate 11 and the left side plate 12 can be reduced.

As described above, the right side plate 11 and the left side plate 12
When the amount of water in the waste increases, the base material 14 changes into a dumpling body, a stirring torque is required, a load is applied to the drive motor 1, and the weight of the base material 14 increases,
For example, when a predetermined amount is continuously supplied every day, the specific gravity of the base material 14 is about 0.25 kg / liter at the beginning, but increases to about 0.5 kg / liter about twice after about one month.
As described above, when the specific gravity of the base material 14 is approximately doubled,
In any state of the base material 14, such as when the amount of water in the waste increases and the base material 14 changes to a dumpling body, the treatment tank 10 can obtain sufficient rigidity to withstand without distortion.

As shown in FIG. 5, the right side plate 11,
The reinforcement of the left side plate 12 is performed by using the plate reinforced by bending or the like as the flange portions 11a 'and 12a' as side plate portions 11b 'and 12b'.
The required strength can also be secured by welding, rivets or bolts.

Further, as shown in FIG. 4B, a plurality of holes 28 are formed in the plates (the right side plate 11 and the left side plate 12) on the side walls of the processing tank, and the convex portions 29 corresponding to the main body plate 13 of the processing tank 10 are formed. By providing the protrusions 29 through the holes 28, the fitting in which the relative positions between the right side plate 11, the left side plate 12, and the main body plate 13 are reliably determined can be easily performed.

Further, a plate on the side wall of the processing tank (right side plate 11,
Since the right bearing 8 and the left bearing 9 for the stirring shaft 7 for stirring the substrate 14 are arranged on the left side plate 12), the stirring shaft 7 can be accurately positioned, as shown in FIG. In addition, the distance between the rotation tip radius R1 of the stirring blade 6 attached to the stirring shaft 7 and the arc R inside the processing tank 10 is kept uniform, and the rotation tip of the stirring blade 6 can be prevented from coming into contact with the inside of the processing tank 10. For this reason, stable stirring can be realized, the efficiency of waste decomposition treatment is improved, and the life of the base material 14 can be extended.

As shown in FIG. 2, the collar portions 11a,
A gap is provided between 12a and the exterior member 25 so as not to contact each other. The upper part of the exterior member 25 is fixed to the upper frame 16 with screws 30 as shown in FIG. 3A, and the lower part of the exterior member 25 is engaged with the lower frame 15 as shown in FIG. The character member 31 is in close contact with the lower frame 15 so as to provide a gap.

The gap prevents the vibration of the drive system such as a drive motor from being directly transmitted to the exterior member 25, and prevents troubles such as loosening of the screw 30 and peeling of the exterior member 25. Further, the gap also serves to prevent the heat of the sheet heater 18 for keeping the inside of the processing tank 10 at an appropriate temperature from being transmitted to the exterior member 25, thereby reducing the amount of heat radiation and saving power of the sheet heater 18.

[0066]

As described above, according to the present invention, since the side wall of the processing tank also serves as the apparatus frame, the apparatus frame is conventionally formed of an aluminum frame or the like, and has a structure for supporting the load of the processing tank and the base material. The weight of the equipment frame increases,
The problem of increasing the total weight of the device and the problem of increasing material and processing costs can be solved. For this reason, the waste disposal apparatus of the present invention can reduce the number of parts by reducing the number of frame members, improve the yield of materials, and have both light weight and low cost.

Since the side wall of the processing tank is reinforced and flat, the substrate changes into a dumpling when the water content of the waste increases, a stirring torque is required, and a load is applied to the drive motor, and The weight of the substrate also increases. For example, if a predetermined amount is continuously supplied every day, the specific gravity of the base material is about 0.25 kg / liter at the beginning, but is about twice as large as about 0.5 kg after about one month.
When the specific gravity of the base material is increased to about twice as large as that of the base material, or when the water content of the waste increases and the base material changes into a dumpling body, the treatment tank 10 can be used in any state of the base material.
However, it is possible to obtain sufficient rigidity that can withstand without distortion.

The side wall of the processing tank is provided with a plurality of holes for fitting a processing tank main body having a U-shaped side sectional shape, so that the relative position between the processing tank side wall and the processing tank main body can be adjusted. Since the stirrer can be determined reliably and the stirrer shaft that stirs the base material is supported on the plate on the side wall of the processing tank, the stirrer shaft can be positioned accurately, and the rotation of the stirrer attached to the stirrer shaft Keep the distance between the tip radius and the arc inside the processing tank uniform,
It is possible to prevent the rotating tip of the stirring means from coming into contact with the processing tank. For this reason, stable stirring can be realized, the efficiency of the waste decomposition treatment is improved, and the life of the base material can be extended.

Since the side wall of the processing tank is disposed with a gap from the outer member of the apparatus, vibration of a driving system such as a driving motor can be prevented from being directly transmitted to the outer member, and loosening of the screw and peeling of the outer member can be prevented. Trouble can be prevented. In addition, the gap also serves to prevent the heat of the heating means such as a planar heater for keeping the inside of the processing tank at an appropriate temperature from being transmitted to the exterior member, thereby reducing the amount of heat radiation and saving power of the heating means.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a waste disposal apparatus according to an embodiment.

FIG. 2 is a partially cutaway view of the configuration of the waste disposal apparatus according to the embodiment as viewed from the side.

FIG. 3 is an enlarged view showing portions A and B in FIG. 2;

FIG. 4 is a perspective view showing the entire structure of an apparatus frame of the waste disposal apparatus according to the embodiment.

FIG. 5 is a perspective view showing a structure of a processing tank of another example according to the embodiment.

FIG. 6 is a perspective view showing an appearance of a waste disposal apparatus according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive motor 2 Output shaft 3 Small sprocket 4 Chain 5 Large sprocket 6 Stirrer blade 7 Stirring shaft 8 Right bearing 9 Left bearing 10 Processing tank 11 Right side plate 11a Collar portion 11b Side plate portion 12 Left side plate 12a Collar portion 12b Side plate portion 13 Main plate 14 base material 15 lower frame 16 upper frame 17 base material state measurement sensor 18 planar heater 19 ventilation fan 20 intake port 21 exhaust port 22 input lid 23 input port 24 control unit 25 exterior member 26 exhaust duct 27 dust removal filter 28 hole 29 convex Part 30 screw 31 L-shaped member

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Gozo Matsuura 1248 Shimokagemori, Chichibu City, Saitama Prefecture Inside Canon Electronics Co., Ltd. (72) Inventor Hiroyuki Hagiwara 1248 Shimokagemori, Chichibu City, Saitama Prefecture Canon Electronics Stock In-house (72) Inventor Yukio Matsumoto 1248 Shimokagemori, Chichibu City, Saitama Prefecture Inside Canon Electronics Co., Ltd. (72) Inventor Shinichi Yamanaka 1248 Shimokagemori Oji, Chichibu City, Saitama Prefecture Canon Electronics Inc. (72) Invention Person Takeshi Kimura 1248 Shimokage Mori, Chichibu City, Saitama Prefecture Inside Canon Electronics Inc. CA22 CA40 CB04 CB28 CB32 CB36 CC02 CC07 CC08 CC15 DA01 DA02 DA09 DA20 4G037 CA11 EA03 4G078 AB20 BA01 DA01 EA03

Claims (7)

[Claims] 1. A stirring tank for stirring input waste and decomposing said waste, and a stirrer rotatably supported by a side wall of the processing tank and transmitting driving force to stirring means for stirring the mixture in the processing tank. A waste treatment apparatus comprising: a shaft; and a side wall of the treatment tank also serving as an apparatus frame. 2. A processing tank which has a U-shaped side cross-section, agitates a mixture containing wastes charged therein, and decomposes the wastes, and a mixture of a base material and wastes contained in the processing tanks. A stirring shaft that is rotatably supported by the side wall of the processing tank and transmits a driving force to the stirring means; an input port that inputs waste into the processing tank; and an input lid that opens and closes the input port. Wherein the side wall of the processing tank also serves as an apparatus frame. 3. A U-shaped side cross-section, which stirs input waste and a processing tank for decomposing the waste, and stirs a mixture of base material and waste contained in the processing tank. A stirring means, a stirring shaft which is pivotally supported on the processing tank side wall and transmits a driving force to the stirring means, an input port for inputting waste into the processing tank, an input lid for opening and closing the input port, Heating means for heating the mixture in the processing tank; an intake port for taking in outside air into the processing tank; an exhaust port for exhausting gas in the processing tank; and a removable dust filter for preventing external leakage of fine powder. And a ventilation fan that communicates with the intake port or the exhaust port to ventilate the inside of the processing tank, wherein the side wall of the processing tank also serves as an apparatus frame. Processing equipment. 4. The waste treatment apparatus according to claim 1, wherein the side wall of the treatment tank has a reinforced plate shape. 5. The waste treatment apparatus according to claim 1, wherein the side wall of the treatment tank is formed in a flat plate partly bent and reinforced. 6. The processing tank according to claim 1, wherein a plurality of holes are formed in the side wall of the processing tank for fitting a processing tank main body having a U-shaped side cross section. A waste treatment apparatus according to any one of the preceding claims. 7. The waste treatment apparatus according to claim 1, wherein the side wall of the treatment tank is disposed with a gap from an exterior member of the apparatus.