WO2015125962A1

WO2015125962A1 - Waste treatment device and waste treatment method

Info

Publication number: WO2015125962A1
Application number: PCT/JP2015/055089
Authority: WO
Inventors: 喜之鳥丸
Original assignee: 中部エコテック株式会社
Priority date: 2014-02-24
Filing date: 2015-02-23
Publication date: 2015-08-27
Also published as: CN106061634A; CN106061634B

Abstract

Provided is a waste treatment device that is inexpensive, has excellent outer appearance, has minimal impact on the outside environment, and is capable of performing stable treatment. This waste treatment device (1) comprises: a circular-cylindrical upright container (2) having a stirring blade, etc., provided therein; and a quadrangular-tubular device outer wall (9) that substantially circumscribes the circular-cylindrical outer periphery of said container (2). The device outer wall (9) is constituted by combining outer heat-insulating panels (9a to 9d) that are provided so as to cover the circular-cylindrical outer periphery of the container (2) with a space therebetween. Heat-exchanging means that heats, by utilizing the heat of an exhaust gas, outside air introduced into the container (2) is provided in the four redundant spaces (A to D) at the corners of the quadrangular tube.

Description

Waste treatment apparatus and waste treatment method

The present invention relates to a waste treatment apparatus (sealed fermentation drying apparatus) for treating organic waste such as livestock excrement and food residues, and a waste treatment method using the apparatus.

Organic waste such as livestock excreta discharged from livestock management bodies and food residues discharged from food industry establishments has increased in recent years, and their disposal has become a major social issue. ing. When these wastes are incinerated, the cost is high and there is a problem of dioxin generation. In addition, when landfilling is performed, there are problems of securing an exhaust location and odor damage. In addition, in recent years, the promotion of the reuse of organic waste has been demanded by legislation such as the Food Recycling Law. In view of these points, organic waste is composted and recycled as a recycling resource. Even when composting, organic wastes such as food residues have a high water content, so if they are not sufficiently dried and fermented, they may have a large volume and weight and may be spoiled.

Composting facilities are broadly classified into "open type", where waste is deposited on the site, and then switched to compost, and "closed type", where it is put into a container and composted. . The sealed type has advantages such as space saving and less odor damage to the surroundings. As a sealed type, in recent years, organic waste has been dried and composted using a sealed fermentation drying apparatus (also referred to as “component”) that utilizes the fermentation action of microorganisms. This component has a cylindrical vertical tank shape, and is a composting device having a sealed vertical structure in which input waste does not easily come into contact with outside air.

For example, as a fermentation treatment apparatus for food residues, food residues and aerobic microorganisms are mixed in an airtight vertical container, and the food residues are fermented by the action of aerobic microorganisms while agitating the inside of the container. An apparatus has been proposed (see Patent Document 1). In this fermentation treatment apparatus, a plurality of upper and lower stirrer blades are radially extended around a rotating shaft standing in a vertical container, and a plurality of vent holes are drilled below the lowermost stirrer blade. The air is vented into the container through the vent. Here, the vertical container is a three-layered heat insulating container having a heat insulating layer between an inner layer and an outer layer. In addition, incidental devices such as an exhaust blower and a blower are installed outside the apparatus. Further, examples of the shape of the stirring blade include a blade shape and a rod shape, and a screw type having a blade-shaped stirring blade is particularly described from the viewpoint of stirring efficiency.

JP 2010-69477 A

However, since the waste disposal apparatus (component) like patent document 1 is installed and used outdoors, it is easy to receive the influence of external environments, such as the weather, and cannot perform the stable process even when using a heat insulation container. There is a fear. In addition, the component has a simple cylindrical vertical tank shape because of its internal structure using a stirring blade, and no particular consideration is given to its appearance design.

In addition, for users such as livestock farmers, the treatment of organic waste such as livestock excrement is treatment of unnecessary matter (dust), and the waste treatment equipment can provide initial costs at the time of introduction and running costs during operation. It is desirable to reduce as much as possible. As ancillary equipment of the device, there are a hydraulic unit, a blower, an exhaust blower, a deodorizing device, etc., but these are separated from the vertical container and it is very troublesome to install at the installation site. (Initial cost) will increase. Furthermore, the destabilization of the heat insulation surface requires continuous operation of a separate air heater and leads to an increase in running cost.

As in Patent Document 1, stirring means including a stirring blade is essential in a waste treatment apparatus. However, depending on the shape of the stirring blade and the operation method, the load applied to the stirring blade, the rotating shaft, etc. becomes too large, and there is a possibility that these parts are partially damaged. Moreover, sufficient stirring performance cannot be obtained, and there is a possibility that poor fermentation may occur, and the time required for drying and composting may be prolonged. In the apparatus of Patent Document 1, the effect on the processing amount (amount that can be processed in the same time) and the amount of malodor generation due to the difference in the shape of each stirring blade (each stage) has not been studied.

In composting treatment, substances that cause malodors such as ammonia and lower fatty acids such as propionic acid, normal acetic acid, isovaleric acid, and normal valeric acid are generated by decomposition of organic matter. For example, the malodorous substance is likely to be generated when the drying speed is low. If generation | occurrence | production of ammonia etc. is suppressed, the product (compost) with a high fertilizer effect can be manufactured. Patent Document 1 describes that the drying speed is increased by increasing the air flow rate, but depending on the air flow rate range and the relationship with the shape of the stirring blade, a sufficient effect cannot be obtained. There is a risk of poor fermentation due to a decrease in temperature.

Increasing the blast volume from the normal set value in a sealed component is considered to lead to cooling waste that has risen in temperature due to fermentation, and was not generally performed. Actually, as shown in FIG. 8B, which will be described later, when a component having a conventional structure is used and the air flow rate is simply increased from the normal set value, the processing amount tends to gradually decrease.

Also, the closed type such as a component has a demerit that the running cost is higher than the open type. For users such as livestock farmers, the treatment of organic waste such as livestock excrement is treatment of unnecessary matter (dust), and it is hoped that the cost will be reduced as much as possible. When making a complicated structural improvement, an increase in cost is inevitable. For this reason, maintaining the ability of components for many years has been given priority first, and the development of technology for improving performance has not progressed significantly. Therefore, it is desired to develop an apparatus capable of producing a product (compost) having a high fertilizer effect, which can realize high processing performance and reduce generation of malodorous substances with relatively simple means.

The present invention has been made to cope with such a problem. First, an object of the present invention is to provide a waste treatment apparatus that is low in cost, excellent in appearance, less affected by the external environment, and capable of stable treatment. It is another object of the present invention to provide a waste treatment apparatus and a waste treatment method that can reduce the amount of malodorous substances generated by using relatively simple means as needed, having high treatment capacity.

The waste treatment apparatus of the present invention includes an airtight cylindrical vertical container, a rotary shaft provided in the vertical direction in the container, a plurality of stirring blades fixed around the rotary shaft, and the container An air supply means for sending outside air into the container and an exhaust means for discharging the inside air accumulated in the container to the outside of the container. The waste treatment apparatus is configured to remove organic waste introduced from the upper part of the container into the container while being stirred with the stirring blade, fermented and dried, composted, and taken out from the lower part of the container. And an external heat insulating panel installed so as to cover at least a part of the outer periphery of the cylinder of the container via a space. Moreover, the apparatus outer wall comprised by the said external heat insulation panel is a square cylinder shape substantially circumscribed on the cylinder outer periphery of the said container, It is characterized by the above-mentioned.

The waste treatment apparatus has heat exchange means for heating the outside air introduced from the air supply means into the container by heat of the exhaust from the exhaust means, and the cylindrical outer periphery of the container, the external heat insulation panel, The heat exchange means is installed in the space between the two.

The outer wall of the apparatus constituted by the external heat insulating panel has a rectangular tube shape that substantially circumscribes the outer periphery of the cylinder of the container, and the heat exchange means is formed between the outer wall of the apparatus and the outer periphery of the cylinder of the container. An exhaust passage that is installed in the space of the corner of the rectangular tube and through which the exhaust discharged from the container passes, and an air that passes outside air before introduction into the container that is installed through the exhaust passage. It is comprised from piping.

The air supply means and the exhaust means are accommodated in the apparatus.

In the container, the stirring blade is spaced at a predetermined interval from the lower part to the upper part of the rotating shaft, and at least three or more stages are provided at each stage, from the rotating shaft toward the inner wall of the container. The stirring blade has an inclined surface on the front side in the rotation direction, and the inclination angle of the uppermost stirring blade with respect to the rotation surface of the stirring blade is 60 to 85 degrees. The angle of inclination of the inclined surface of the lowermost stirring blade with respect to the rotating surface of the stirring blade is 15 to 25 degrees, and the rotation of the stirring blade on the inclined surface of the stirring blades other than the uppermost stage and the lowermost stage The inclination angle with respect to the surface is 35 to 45 degrees, and the lowermost stirring blade has a vent hole that communicates with the air supply means and introduces outside air sent from the air supply means into the container. Features.

In the configuration in which the shape of the stirring blade is limited, the inner volume of the container is 15 m ³ or more, and the air supply means has an air flow rate (m ³ ) per minute introduced into the container from the vent hole during processing. It is a means which becomes 1/4 or more of the internal volume (m ³ ) of the container. Further, the air feeding means is characterized in that a static pressure of air blown into the container from the vent hole during processing is 15 kPa or more. The waste treatment apparatus may further include a heat exchanging unit that heats the outside air introduced into the container from the air supply unit by the heat of the exhaust from the exhaust unit.

The waste treatment method of the present invention is characterized by composting using the waste treatment apparatus of the present invention having a configuration in which the shape of the agitating blade and the amount of blown air are limited.

The waste treatment apparatus of the present invention includes an airtight cylindrical vertical container, a rotary shaft provided in the vertical direction in the container, a plurality of stirring blades fixed around the rotary shaft, and the container An air supply means for sending outside air into the inside and an exhaust means for discharging the inside air accumulated in the container to the outside of the container. The outside air is introduced into the container by the air supply means, and the exhaust means An apparatus for discharging organic waste introduced from the upper part of the container into the container with stirring blades while fermenting and drying, composting and taking out from the lower part of the container. Since it has an external heat insulation panel installed so as to cover at least partly through a space, it has a high heat insulation effect due to the air layer of the space, and the apparatus installed outdoors has little influence of the external environment and stable processing. It becomes possible. Moreover, since it can be made into shapes other than simple cylindrical vertical shape by the combination of an external heat insulation panel, it is excellent also in an external appearance.

The waste treatment apparatus has a heat exchange means for heating the outside air introduced into the container from the air supply means by the heat of the exhaust from the exhaust means, and a space between the cylindrical outer periphery of the container and the external heat insulation panel Since the heat exchanging means is installed, the fermentation heat of the processed product can be effectively used while using the surplus space, and a separate air heater is not required, and the running cost can be reduced.

The outer wall of the device constituted by the external heat insulating panel is a square tube that is substantially circumscribed on the outer periphery of the container, and the heat exchange means is a rectangular tube formed between the outer wall of the device and the outer periphery of the container. An exhaust passage portion that is installed in the corner space and through which the exhaust discharged from the container passes, and a ventilation pipe through which the outside air before introduction passes through the container that is installed through the exhaust passage portion. Therefore, while reducing the surplus space and reducing the size of the entire apparatus, the surplus space can be effectively used to reduce the running cost as described above.

Since the air supply means and the exhaust means are accommodated inside the apparatus, the entire apparatus can be made compact. Moreover, the construction period and construction cost (initial cost) at the time of enforcement can be reduced compared with the case where these are incorporated separately at the installation site.

In the container, the stirring blade is spaced at a predetermined interval from the lower part to the upper part of the rotating shaft, and at least three or more stages are provided at each stage, from the rotating shaft toward the inner wall of the container. It extends linearly and each inclination angle is within the predetermined range. Further, in the configuration in which the shape of the stirring blade is limited as described above, the internal volume and the blowing rate of the container are set to the predetermined range. For this reason, it is possible to expand the high-temperature zone while realizing the super aerobic by spreading the blown air to the entire processed material (detail), and it is possible to realize high processing capacity and reduction of malodorous substances.

More specifically, the stirring blade having a high inclination angle at the uppermost stage makes it easy to spread the treated material (waste) flatly and can increase the contact area with the outside air. With the stirring blade, it is possible to positively stir the processed product whose temperature has been increased by fermentation heat at the uppermost stage. In addition, the stirring blade having a lower inclination angle at the bottom stage can uniformly distribute the air to the entire processing object while reducing the applied load. Since the blast volume is increased in this state, the drying and composting treatment can be further shortened, and the generation amount of malodorous substances such as lower fatty acids and ammonia can be remarkably reduced.

In the configuration in which the shape of the stirring blade is limited, since the static pressure of the air introduced into the container from the vent hole during the treatment in the air supply means is 15 kPa or more, the air can be easily penetrated even when the moisture content of the processed product is high. High processing capacity and reduction of malodorous substances can be realized. Further, since the waste treatment apparatus has a heat exchange means for heating the outside air introduced into the container from the air supply means by the heat of the exhaust from the exhaust means, the heat of fermentation of the treated product can be effectively used. In addition, a separate heater is unnecessary, and the running cost can be reduced.

Since the waste treatment method of the present invention uses the waste treatment apparatus of the present invention having a configuration in which the shape of the stirring blade and the amount of blast is limited, compared to the conventional apparatus, the organic waste is dried and composted. The processing time can be shortened, the amount that can be processed per day is increased, the amount of malodorous substances generated can be reduced, and a product (compost) with a high fertilizer effect can be produced.

It is the perspective view and top view which show the external appearance of the waste disposal apparatus of this invention. It is a longitudinal cross-sectional view of the waste disposal apparatus of FIG. It is a figure explaining an exhaust route and a ventilation route. It is sectional drawing of the stirring blade in FIG. It is an enlarged view of the lowermost stirring blade in FIG. It is a longitudinal cross-sectional view which shows the other example of the waste disposal apparatus of this invention. It is a schematic diagram which shows the flow of the external air (air blowing) introduced in the container. It is a figure which shows the relationship between the ventilation volume by the difference in a stirring blade shape, and processing amount. It is a figure which shows the relationship between ventilation volume and a lower fatty acid density | concentration. It is a figure which shows the relationship between the difference in a stirring blade shape, and a lower fatty acid concentration. It is a figure which shows the relationship between ventilation pressure and a lower fatty acid density | concentration.

An example of the waste treatment apparatus of the present invention will be described with reference to FIGS. Fig.1 (a) is a perspective view which shows the external appearance of a waste disposal apparatus, and FIG.1 (b) is the top view. As shown in FIGS. 1 (a) and 1 (b), a waste treatment apparatus 1 includes a cylindrical vertical container 2 provided with a stirring blade therein, and a rectangular cylindrical shape that is substantially circumscribed on the outer periphery of the cylinder of the container 2. A closed-type fermentation drying apparatus (component) having an apparatus outer wall 9. The container 2 that is a fermenter is a heat-insulating container that itself has a metal outer layer and a heat-insulating layer, and is an air-tight container that is unlikely to come into contact with outside air other than that introduced from the vent holes. The apparatus outer wall 9 is configured by combining external heat insulating panels 9a to 9d installed so as to cover the outer periphery of the cylinder of the container 2 with a space therebetween. A machine room 5 is integrally provided below the container 2 covered with the apparatus outer wall 9. The overall appearance of the device is a substantially quadrangular prism shape. Heat insulation is achieved by the air layer in the space between the container 2 and the external heat insulation panels 9a to 9d, and the double heat insulation structure with the (heat insulation) container 2 stabilizes the apparatus installed outside with little influence from the outside environment. Processing is possible.

The external heat insulating panels 9a to 9d may be formed of small units that can be further disassembled. Since the waste disposal apparatus of the present invention is a large-sized apparatus for business use in which the internal volume of the container 2 is 15 m ³ or more, the external heat insulating panel also has a very large size (3 m or more in the longitudinal direction). Construction from a smaller unit panel enables construction with a small number of people. In addition, if the bolts are used to connect the panels, there is a possibility that the holes do not fit due to manufacturing errors. For this reason, it is preferable not to use a bolt etc., but to provide a concavo-convex shape that fits between adjacent panels, and to implement these by fitting them. By adopting the fitting with the uneven shape, it is possible to prevent the deviation at the time of enforcement, and to suppress the deterioration of the heat insulation performance.

The internal structure of the waste disposal apparatus in FIG. 1 will be described with reference to FIG. FIG. 2 is a longitudinal sectional view of the waste treatment apparatus of FIG. As shown in FIG. 2, the waste treatment apparatus 1 includes a cylindrical vertical container 2, a rotary shaft 3 provided in the vertical direction in the container 2, and a plurality of agitation fixed around the rotary shaft 3. The blade 4 is provided with a blower 6 that is an air supply means into the container 2 and an exhaust blower 7 that is an exhaust means to the outside of the container 2. The lower part of the lowermost stirring blade has a vent hole 4d, and the outside air sent from the blower blower 6 passes through the blower pipe (see FIG. 3) in the apparatus and the introduction pipe 10 provided in the rotary shaft, It is introduced into the container through the vent hole. The container 2 has an organic waste inlet 2a and a gas outlet 2c, and a compost (organic waste after treatment) outlet 2b at the bottom. The inlet 2a and the outlet 2b are provided with an openable / closable lid for ensuring the airtightness of the container. In the machine room 5, a hydraulic unit 8 that is a driving unit of the rotary shaft 3, the above-described blower 6 and exhaust blower 7 are provided. The rotary shaft 3 penetrates into the machine chamber 5 and is rotated at a predetermined rotational speed by the hydraulic unit 8. Since the hydraulic unit 8, the blower 6 and the exhaust blower 7 are housed and integrated in the apparatus, the construction period and construction cost (initial cost) at the time of enforcement can be reduced.

In the waste treatment apparatus of the present invention, the organic waste to be treated (hereinafter also simply referred to as “waste” or “treated product”) includes livestock excrement, food waste, septic tank sludge containing a large amount of organic components. Or mixtures thereof. Specifically, livestock excretion includes chicken excrement, pig excrement, cattle excrement, horse excrement, etc., food waste includes garbage, food production by-products, etc. Examples include sludge extracted from sludge septic tanks. In addition, composting of waste is performed by aerobic fermentation in a container while aeration is performed by blowing air in the presence of aerobic fermentation bacteria. As the aerobic fermenting bacteria, fermenting bacteria that are activated at about 30 to 90 ° C. are preferable, and examples thereof include the genus Geobatisul and Bacillus.

In this apparatus, the processed product is introduced into the container 2 from the input port 2a, and the processed product is taken out from the outlet 2b at the bottom of the container after fermentation and composting in the container. Fermentation and composting are performed by rotating each stirring blade 4 at a low speed while introducing outside air from the vent holes 4d of the lowermost stirring blade, aeration and stirring the processed material, and aerobic fermentation. Moreover, it is also dried simultaneously by ventilation. The outside air introduced into the container from the vent hole 4d of the lowermost stirring blade flows upward while passing through the processed material, and is exhausted from the exhaust port 2c together with gas and water vapor generated from the processed material (see FIG. 3). Sent to.

As shown in FIG. 1B, in this embodiment, the apparatus outer wall 9 is formed in a rectangular tube shape that substantially circumscribes the cylindrical outer periphery of the container 2, and thus is formed between the apparatus outer wall 9 and the cylindrical outer periphery of the container 2. The four spaces (A to D) at the corners of the rectangular cylinder are extra spaces having a certain size. In order to make effective use of this surplus space, it is preferable to provide heat exchange means for heating the outside air introduced into the container by the blower blower 6 using the heat of the exhaust gas sent by the exhaust blower 7.

The exhaust path from the exhaust port using the exhaust blower, the blow path using the blower, and the heat exchanging means will be described with reference to FIGS. 1 (b) and 3 (a) to (d). FIG. 3 shows a ventilation / exhaust path in the apparatus of FIG. 1 in front (FIG. 3A), right side (FIG. 3B), back (FIG. 3C), left side (FIG. 3D). It is the schematic diagram seen from)). In the figure, a solid line arrow is a flow of air blown into the container (outside air before being introduced into the container), and a two-dot chain line arrow is a flow of exhaust discharged from the container. The blower blower 6 is installed in the middle of the blower piping path, and the exhaust blower 7 is installed in the middle of the exhaust pipe path including the exhaust passage part. By the operation of the blower blower 6, outside air is introduced from the outside air inlet 11 into the blower pipe 6a, and the outside air is continuously sent through the blower pipe 6a. Further, by the operation of the exhaust blower 7, exhaust is introduced into the exhaust pipe 7a from the exhaust port 2c, and the exhaust is continuously sent through the exhaust pipe 7a. In the middle of the exhaust pipe 7a, there is an exhaust passage portion 7b through which exhaust passes and is filled. The blower pipe 6a is installed through the exhaust passage portion 7b. Further, the blower pipe 6a is partially folded in the vertical vertical direction so that it can pass through the exhaust passage portion 7b as long as possible. A ventilation fan 12 is installed at the end of the path of the exhaust pipe 7 a to assist the exhaust by the exhaust blower 7. The exhaust pipe and the blower pipe are connected so as to sequentially pass through the spaces at the four corners. Since the exhaust is heated by a fermentation reaction, the exhaust is at a higher temperature (60 ° C. or higher) than the outside air. By passing the ventilation pipe 6a through the exhaust passage 7b, the heat of the exhaust is given to the outside air in the ventilation pipe (heat exchange), and the outside air (air blowing) can be heated to a temperature suitable for the fermentation reaction. . The external heat insulation panel can prevent the heat of the exhaust in the exhaust passage from escaping to the outside of the apparatus. The heat exchange means having such a structure makes it possible to eliminate the need for a heater for heating and blowing air while effectively utilizing the surplus space formed by providing the external heat insulating panel, and can greatly reduce the running cost.

In this surplus space, deodorizing means such as a water washing deodorizing device and a chip (pumice) deodorizing tank can be installed in the exhaust path. By providing such deodorizing means, it is possible to reduce the malodor of the exhaust gas while effectively using the surplus space as in the heat exchange means.

Another example of the waste treatment apparatus of the present invention will be described with reference to FIG. FIG. 6 is a longitudinal sectional view showing the configuration of the waste disposal apparatus. As shown in FIG. 6, the waste treatment apparatus 1 of this embodiment includes a cylindrical vertical container 2, a rotary shaft 3 provided in the vertical direction in the container 2, and a plurality of sheets fixed around the rotary shaft 3. This is a closed-type fermentation and drying apparatus (component) comprising a stirring blade 4, a blower blower 6 that is an air supply means into the container 2, and an exhaust blower 7 that is an exhaust means to the outside of the container 2. In particular, the container 2 is a large-sized apparatus for business use with an internal volume of 15 m ³ or more. A vent hole 4d is provided at the lower part of the lowermost stirring blade, and outside air (air blowing) sent from the blower blower 6 is introduced into the container through the pipe 6a provided in the rotary shaft. The container 2 that is a fermenter is a heat-insulating container having a metal outer layer and a heat insulating layer, and is an airtight container that is difficult to come into contact with outside air other than that introduced from a vent hole. The container 2 has an organic waste inlet 2a and a gas outlet 2c, and a compost (organic waste after treatment) outlet 2b at the bottom. The exhaust port 2 c is connected to the exhaust blower 7. The inlet 2a and the outlet 2b are provided with lids that can be opened and closed to ensure the hermeticity of the container.

6, a machine room 5 is provided below the container 2, and a hydraulic unit 8 that is a driving unit for the rotating shaft 3 and the above-described blower 6 are provided in the machine room. The rotating shaft 3 penetrates into the machine room 5 and is rotated at a predetermined number of rotations by a driving means. Moreover, the waste treatment apparatus 1 has an external heat insulation panel installed so that it may cover through the space of the outer periphery of the container 2 similar to FIG. 1 (illustration omitted). By providing an external heat insulating panel and having a double heat insulating structure with the container, more stable processing can be performed in the apparatus installed outdoors.

Moreover, in the form shown in FIG. 6, the heater 13 for heating the external air sent from the blower blower 6 is provided. The heater 13 is not essential, and for example, heat exchange means (not shown) for heating the outside air introduced from the blower blower 6 into the container using the heat of the exhaust from the exhaust blower 7 may be provided. In this case, a heater can be omitted, and the running cost can be reduced. The form and installation location of the heat exchanging means are not particularly limited, and examples thereof include passing a ventilation pipe before introduction into the container through a deodorizing apparatus filled with exhaust gas.

In this apparatus, the processed product is introduced into the container 2 from the input port 2a, and the processed product is taken out from the outlet 2b at the bottom of the container after fermentation and composting in the container. Fermentation and composting are performed by rotating each stirring blade 4 at a low speed while introducing outside air from the vent holes 4d of the lowermost stirring blade, aeration and stirring the processed material, and aerobic fermentation. Moreover, it is also dried simultaneously by ventilation. The outside air introduced into the container from the vent hole 4d of the lowermost stirring blade flows upward while passing through the processed material, and is exhausted from the exhaust port 2c together with the gas and water vapor generated from the processed material. This exhaust is forcibly performed by the exhaust blower 7.

The air flow rate and the shape of the stirring blade in the waste disposal apparatus of the present invention (shown in FIGS. 1 and 6) will be described in detail.
The processed product is a complex mixture including a solid material, a liquid material, and a semi-liquid material, and is partially a lump. For this reason, if a ventilation does not reach the center part, the part of an anaerobic state will increase. In addition, even when the moisture content of the processed product is high, it is difficult for the air to pass through. In this case, decomposition of the organic waste by the anaerobic microorganisms generates lower fatty acids such as propionic acid, normal acetic acid, isovaleric acid, and normal valeric acid, causing a bad odor. In addition, when the blown air does not reach the details of the processed product, the drying speed is also delayed, and ammonia is generated due to the presence of moisture, which similarly causes bad odor. Ammonia is generated by the action of urease (pig manure) and uricase (chicken manure), which are urea degrading enzymes, in the presence of urea and water.

In the waste treatment apparatus of the present invention, if necessary, (1) air supply means capable of setting the air volume and pressure is set higher than usual, and (2) the shape of the stirring blade is optimized. As a result, even when the moisture content of the processed product is high, it is possible to expand the high-temperature zone while spreading the air blow to the details to make it super aerobic, and to realize high processing capacity and reduction of malodorous substances. High processing capacity means that there is a large amount of waste that can be processed in the same time. Completion of processing means that the waste that has been input into the container is taken out with a moisture content of 35% by mass or less. Say. Super aerobic can suppress the action of anaerobic microorganisms and suppress the generation of lower fatty acids. Moreover, since the above-mentioned urea-degrading enzyme is inactivated at 70 ° C. or higher, the activity can be reduced by increasing the high temperature zone of 60 ° C. or higher, and the generation of ammonia can also be suppressed. Further, the drying time can be shortened by the large air volume.

(1) About Blowing Volume / Blowing Pressure The blower blower 6 serving as an air feeding means determines the amount of blown air per minute (m ³ ) introduced into the container from the vent hole of the stirring blade during processing, and the volume of the container (m ³ ) It is a device that can be 1/4 or more of the above. As described above, the internal volume of the container in the present invention is mainly targeted for 15 m ³ or more. The internal volume is preferably 15 to 100 m ³ , more preferably 15 to 60 m ³ , and even more preferably 15 to 45 m ³ . Aeration is continued during the treatment period. Since it is possible to increase the amount of treatment and shorten the drying time, and to suppress the generation of malodorous lower fatty acids and ammonia, it is preferable to positively increase the blowing rate within the above range. However, if the amount of air blown is too large, there is a risk that the processed product will be wound up and clogged in the exhaust pipe, so the upper limit is preferably set to 1 / 2.5 of the internal volume (m ³ ) of the container. Therefore, for example, when the internal volume of the container is 41 m ³ , the air flow rate is preferably 10.3 (41/4) to 16.4 (41 / 2.5) m ³ / min. Further, a more preferable range of the blowing rate per minute (m ³ ) introduced into the container is 1 / 3.5 to ^1/3 of the internal volume (m ³ ) of the container.

When the blown amount is smaller than the above range, as shown in FIG. 7 (a), the flow of outside air introduced from the vent hole 4d of the lowermost stirring blade 4 (the dotted line arrow in the figure) is the inner wall side of the container 2. The ventilation on the rotating shaft 3 side may not be sufficient. This is not preferable because it leads to poor fermentation in the portion on the rotating shaft side. Moreover, even if the amount of air flow is simply increased, depending on the shape of the stirring blade, the flow of air flow may also be biased to the outside, resulting in a decrease in temperature at this portion, which may result in poor fermentation.

Note that the specified value of the blast volume of a conventional general waste treatment apparatus in the same field as the present invention is about 1/10 to 1/6 of the internal volume (m ³ ) of the container. For example, when the inner volume of the container is 21 m ³ , the blowing rate is about 2.5 to 3 m ³ / min, and when the inner volume of the container is 41 m ³ , the blowing rate is about 5 to 7 m ³ / min.

As the blower blower 6 serving as the air supply means, it is preferable to use a device that can set the static pressure of the blown air introduced into the container through the air hole of the stirring blade during the treatment to 15 kPa or more. More preferably, it is 20 kPa or more. The static pressure is measured by a pressure gauge provided in the middle of the path from the blower blower to the vent hole of the stirring blade. By sending a high-pressure air blow using such a high static pressure blower, as shown in FIG. 7 (b), the blow-through can pass through the treated object even when processing a waste having a high water content. Sufficient air can be distributed throughout the interior of the container 2. Further, the air is sufficiently blown to the rotating shaft 3 side, and the bias toward the inner wall side of the container 2 can be prevented. Further, by increasing the blowing pressure, the amount of oxygen per volume is increased and the thermal efficiency is also improved. As a result, the generation of lower fatty acids can be remarkably reduced.

(2) About Stirring Blade Shape A predetermined number of stirring blades 4 are provided in each stage at a plurality of stages, spaced apart from each other by a predetermined interval from the lower part to the upper part of the rotating shaft 3 in the container. In the form shown in FIGS. 1 and 6, the number of stages is five, and the number of stirring blades is three in the first stage from the bottom (one is not shown), two in the second stage, and the third stage. In total, nine are provided, one on the fourth stage, one on the fourth stage, and two on the fifth stage. The number of stages of the stirring blades 4 is not limited to the example shown in each figure, and is preferably provided at a position of at least three stages. In each figure, the first stage from the bottom is classified as “lower stage”, the second and third stages as “middle stage”, and the fourth and fifth stages as “upper stage”. Here, when the number of stages is three or more and an arbitrary number of stages, the uppermost stage is always classified as “upper stage”, and the lowermost stage is always classified as “lower stage”. With respect to other than the uppermost and lowermost stages, at least one stage is set as “middle stage”, and the rest is classified into “upper stage”, “middle stage”, and “lower stage” according to the position. The “upper stage” is in an area above the vertical center position of the container 2, and the “lower stage” is in an area below the vertical center position of the container 2.

Also, the number of stirring blades in each stage is not particularly limited, and at least one stirring blade may be provided. About the lowermost stirring blade (with a vent hole), it is preferable that three or more blades are provided at equal intervals in the circumferential direction in order to uniformly and sufficiently blow the air to the whole. Note that the load applied to the stirring blade increases from the upper stage to the lower stage, and in each stirring blade, the load applied to the part closer to the main shaft decreases.

Waste (processed material) is not filled in the container 2 as will be described later, and is provided with a space of about 10 to 20%. The stirring blade 4 is disposed in a range from the bottom of the container 2 to the height H of the processed object, and the position of the uppermost stirring blade is positioned at the substantially uppermost part of the processed object. The position of the lowermost stirring blade is preferably slightly above the bottom of the container 2 and a gap is preferably provided between the bottom. In addition, the distance between each stage can be arbitrarily determined according to the number of stages with reference to the uppermost stage and the lowermost stage.

In some conventional closed-type fermentative drying apparatuses, the stirring blades are provided in a plurality of stages. However, it is recognized that the stirring blades are only used for stirring (the lowermost stage is also blown), and all stages The same shape of the impeller is used, and the role of each stage has not been sufficiently studied. On the other hand, in the present invention, the role of the stirring blade is clarified in each stage (particularly, the three stages of the lower stage, the middle stage, and the upper stage), and the form thereof is examined based on this.

Each role is as follows. The upper stage (particularly the uppermost stage) is used to promote fermentation by extending the treated product flatly and increasing the contact area with the outside air (introduced from the stirring blade). The middle stage is used to actively agitate the processed product whose temperature has been increased by fermentation heat in the upper stage. The lower stage (particularly the lowermost stage) is mainly used for blowing air entirely because the stirring is completed in the upper stage and the middle stage.

The shape of all the stirring blades 4 is a pitched paddle shape linearly extending from the rotating shaft 3 toward the inner wall side of the container 2, and has an inclined surface on the front side in the rotation direction. The inclined surfaces of the stirring blades 4 are planes inclined at an inclination angle of less than 90 degrees (acute angle) with respect to the rotation surface (horizontal plane) of the stirring blades. That is, the angle formed between the rear direction in the rotation direction and the upper direction of the inclined surface is less than 90 degrees. As the agitating blade rotates, the processed material is agitated in such a manner as to run along the inclined surface.

The shape of the stirring blade will be described in detail with reference to FIG. FIG. 4 is a cross-sectional view in the direction of the rotation axis of the stirring blade at each stage in FIGS. 1 and 6. As shown in FIG. 4, each stirring blade 4 is joined to the bottom plate 4b parallel (horizontal) to the rotation surface of the stirring blade, the swash plate 4a joined to the bottom plate 4b, and the bottom plate 4b and the swash plate 4a. And a bent plate 4c having an L-shaped cross section. The outer surface (planar surface) of the swash plate 4a is the above-mentioned “inclined surface of the stirring blade”, and the swash plate 4a is joined to the front side in the rotational direction of the bottom plate 4b. In addition, as long as the shape of the stirring blade has the above-described inclined surface, the other specific structure is not particularly limited to the shape shown in FIG. However, for the lowermost stirring blade, the outside air path described later is required.

In the waste treatment apparatus of the present invention, the inclination angle θ ₁ of the inclined surface of the uppermost stirring blade 4 in the upper stage is 60 to 85 degrees, more preferably 60 to 70 degrees, and 62 to 67 degrees. More preferred. The inclination angle θ ₃ of the inclined surface of the lower (including the lowermost) stirring blade 4 is 15 to 25 degrees, and more preferably 18 to 22 degrees. About the upper stage (especially uppermost stage), it becomes easy to extend a processed material flatly by making an inclination angle high like the said range, and can increase the contact area with external air. Moreover, since it is an upper part of a processed material, stirring resistance is small and a load is hard to become large even at a high inclination angle. On the other hand, the lower stage has a large stirring resistance because it is the lower part of the processed product, but the load can be reduced by lowering the inclination angle within the above range. Further, since the stirring is completed in the upper stage and the middle stage, even if the inclination angle is lowered and the stirring performance of the portion is lowered, sufficient stirring performance can be exhibited as the entire apparatus. Furthermore, the inclination angle of the lowermost stirring blade does not adversely affect the blowing performance, which is the role of the stirring blade.

The inclination angle theta ₂ of the inclined surface of the middle of the stirring blades 4 is 35 degrees to 45 degrees, 38 degrees to 42 degrees is more preferable. The middle stage is used to actively agitate the processed product whose temperature has been increased by fermentation heat in the upper stage. In the middle stage, if there is a lot of downward flow, it will lead to a decrease in the contact time and the amount of contact with the outside air, but by using a stirring blade having the above inclination angle, this downward flow is minimized. Can do. In addition, the larger the middle inclination angle, the better the stirring performance, but the greater the load.

In combination with the above-mentioned air flow rate, etc., it is possible to achieve a high processing capacity and a significant reduction in bad odor. Therefore, in the configuration shown in FIGS. 1 and 6 (all five stages), from the bottom, 20 degrees (bottom stage), 40 degrees, It is most preferable to set it to 40 degrees, 40 degrees, and 65 degrees (the uppermost stage).

Each stirring blade 4 has a hollow portion 4e surrounded by a swash plate 4a, a bottom plate 4b, and a bent plate 4c. A hollow portion 4e of the lowermost stirring blade 4 communicates with the piping in the rotating shaft 3 and forms an outside air path to a vent hole 4d (through hole) provided in the lower part of the bent plate 4c. Since the lower part of the bent plate 4c provided with the vent hole 4d is located on the rear side in the rotational direction, clogging due to the processed material is unlikely to occur. In the form shown in each figure, the vent hole is formed only in the lowermost stirring blade. However, the present invention is not limited to this. For example, the vent hole may be formed in the further stirring blade. .

Further, as shown in FIG. 5, a plurality of vent holes 4d are provided in the longitudinal direction of the stirring blade 4, and the intervals are closer in steps toward the outer side in the longitudinal direction of the stirring blade (inner wall side of the container). It is formed to become. By arranging the vent hole 4d in this manner, when the compost is taken out from the outlet 2b (see FIG. 1 or 6) provided near the inner wall side of the container 2, it is sufficiently ventilated and dried. It can be taken out.

The waste treatment method of the present invention is characterized in that organic waste is composted using the above-described waste treatment apparatus of the present invention. The specific processing procedure is as follows.

(1) First, waste (processed material) is thrown into the waste processing apparatus leaving a space of 10 to 20% with respect to the internal volume of the apparatus. By introducing the processed product while leaving a space of 10 to 20%, the processed product is sufficiently stirred, so that fermentation and drying are efficiently performed.

(2) The treated product is fermented and dried under predetermined conditions.
There are two operation methods, “batch operation” and “continuous operation”.
(A) In the case of “batch operation”, the treated product is put into a waste treatment apparatus, the stirring blade is rotated at a low speed, and air (outside air) is introduced from the vent of the lowermost stirring blade for 5 days. Degree fermented and dried. There will be no removal or loading for the last 5 days. Thereafter, about 30% by mass of fermented and dried processed material (compost) is left in the apparatus, and the remaining 70% by mass of compost is taken out. The extracted compost becomes the product. If necessary, this may be granulated. The compost left in the waste treatment apparatus is fermented and dried for about 5 days to be composted while being stirred under the same conditions as the previous one together with the newly added treatment.
(B) In the case of “continuous operation”, the treated product is put into a waste treatment apparatus, fermented and dried for 24 hours, and about 20% by mass of compost is taken out 24 hours after the start of operation. After that, a new processed product for the taken-out amount is charged. In this way, treatment input and compost removal are repeated in a 24-hour cycle.

In any case, when the waste treatment apparatus is used for the first time, it is preferable to add in advance about 30% by mass of the previous compost that has been fermented and taken out from this apparatus. This is because acclimated fermentative bacteria are used.

In any operation, the amount of blown air is introduced into the container within the above range. That is, the blast volume per minute (m ³ ) is set to ¼ or more of the internal volume (m ³ ) of the container. Moreover, it is preferable to set it as the above-mentioned range (static pressure 15kPa or more) about ventilation pressure. Moreover, the rotation speed of the stirring blade is adjusted in accordance with the moisture content of the processed product. Usually, the rotation speed is adjusted so as to rotate once in 40 to 60 minutes. The moisture content of the treated product also depends on the number of revolutions of the stirring blade, and the moisture content may exceed 35% in either case of being too early or too late. Further, when the moisture content exceeds 35%, it may be difficult to take out from the container.

1. Relationship between air flow rate and processing volume due to difference in stirring blade shape [Example]
A waste processing apparatus shown in FIG. 6 having an internal volume of 41 m ³ was used with raw pig feces (water content: 73%) as a raw material. The diameter of the container bottom is 4200 mm. The apparatus configuration is as shown in FIG. A total of nine stirring blades were fixed in five stages around the rotation axis, and two or more stages were provided at equal intervals in the circumferential direction. The angle of the inclined surface of the stirring blade (5-stage configuration) is 20 degrees (lowermost stage), 40 degrees, 40 degrees, 40 degrees, 65 degrees (uppermost stage) from the lower stage, and the rotation direction width is 190 mm. The longitudinal length is 1900 mm. The rotation of the stirring blade was adjusted to 40 to 60 minutes per rotation, and the amount of air blown by the blower blower (m ³ / min) was changed to investigate the processing amount that can be processed in one day. The air blowing was introduced by heating to 60 ° C. with a heater. Exhaust was performed constantly at 37 m ³ / min. When the processing amount in each blast amount is possible, it is determined whether the raw material can be taken out with an arbitrary amount of the above-mentioned raw material in the container, and the moisture content can be taken out with a moisture content of 35% by mass or less in one day processing time. The upper limit processing amount was obtained. The outside air temperature during the test is an average of 15 ° C.

[Comparative example]
Raw waste feces (water content: 73%) was used as a raw material, and a waste disposal apparatus with an internal volume of 41 m ³ was used. The apparatus configuration is the same as that of Example 1 except for the angle of the stirring blade. In this comparative example, the inclined surface angles of the stirring blades (5-stage configuration) are 32 degrees (lowermost stage), 32 degrees, 32 degrees, 32 degrees, and 32 degrees (uppermost stage) from the lower stage. The operating conditions and the determination conditions for the processing amount were the same as those in the example, and the processing amount that can be processed in one day was investigated by changing the blowing amount (m ³ / min) by the blowing blower. The outside air temperature during the test is an average of 15 ° C.

These results are shown in FIG. FIG. 8A is an example, and FIG. 8B is a comparative example, each showing a relationship between the air flow rate and the processing amount. As shown in FIG. 8, in the comparative example having a stirring blade shape of the conventional configuration, the processing amount decreases when the air flow rate is a certain level or more. On the other hand, in the example, the processing amount increases in proportion to the blown amount, and it can be seen that the absolute amount of the processing amount is large even though the apparatus has the same volume as the comparative example.

In addition, the relationship between the blowing amount (m ³ ) and the processing amount (t) that can be processed in one day will be examined. In the embodiment, when the air flow rate is 12.5 (m ³ ) at which the processing amount almost reaches a peak, the processing amount is 8.0 (t), and the air flow rate (m ³ ) / processing amount (t) = 1.56. Further, for example, the processing amount in the case of an air blowing amount of 6.0 (m ³ ) is 4.0 (t), and the air blowing amount (m ³ ) / processing amount (t) = 1.50. On the other hand, in the comparative example, when the air flow rate is 5.0 (m ³ ) at which the processing amount almost reaches a peak, the processing amount is 3.0 (t), and the air flow rate (m ³ ) / processing amount (t ) = 1.67. Further, for example, the processing amount in the case of the air blowing amount 3.0 (m ³ ) is 1.8 (t), and the air blowing amount (m ³ ) / the processing amount (t) = 1.67.

As described above, the relationship between the air flow rate (m ³ ) and the processing amount (t) that can be processed in one day has a certain degree of correlation for each apparatus configuration. From the above results, it can be seen that, in the waste treatment apparatus of the present invention, when the blast volume (m ³ ) is X and the treatment volume (t) is Y, (X / Y) <1.7.

2. Relationship Butaseikuso the lower fatty acid concentration which is generated and the blowing amount (water content 73%) as a raw material, using a waste processing apparatus shown in FIG. 6 having an inner volume 41m ^3. The diameter of the container bottom is 4200 mm. The apparatus configuration is as shown in FIG. A total of nine stirring blades were fixed in five stages around the rotation axis, and two or more stages were provided at equal intervals in the circumferential direction. The angle of the inclined surface of the stirring blade (5-stage configuration) is 20 degrees (lowermost stage), 40 degrees, 40 degrees, 40 degrees, 65 degrees (uppermost stage) from the lower stage, and the rotation direction width is 190 mm. The longitudinal length is 1900 mm. The rotation of the stirring blade is adjusted to 40 to 60 minutes per rotation, the amount of air blown by the blower blower (m ³ / min) is changed, and the concentration of the lower fatty acid discharged from the exhaust port (mg / L) is investigated. I did it. The air blowing was introduced by heating to 60 ° C. with a heater. Exhaust was performed constantly at 37 m ³ / min. The concentration of the lower fatty acid was measured by a liquid chromatographic method after 24 hours of condensation of exhaust gas. Treatment time is 1 day (24 hours), raw material input to the container is in proportion to the air blowing amount, 9m ³ / In min 5540kg, 11m ³ / In min 6770kg, 13m ³ / In min 8000 kg, 15 m ³ / min Then, it was 9230 kg.

FIG. 9 shows the measurement results of the concentration of the lower fatty acid with respect to each blowing amount. As shown in FIG. 9, it can be seen that the concentration of the lower fatty acid is reduced as a whole by increasing the air flow rate in the apparatus of the present invention.

3. Relationship between Stirring Blade Shape Difference and Generated Lower Fatty Acid Concentration The lower fatty acid concentration (mg / L) was investigated in the devices of the above-described Examples and Comparative Examples. About an Example, it is the case of air volume 13m < ³ > / min * input amount 8000kg / day, and a comparative example is the case of air volume 5m < ³ > / min * input amount 3000kg / day. The concentration of the lower fatty acid was measured by a liquid chromatographic method after 24 hours of condensation of exhaust gas.

These results are shown in FIG. As shown in FIG. 10, in comparison with the comparative example of the conventional configuration of the stirring blade shape and the blowing amount, in the example in which the stirring blade shape was improved and the blowing amount was increased, the concentration of the lower fatty acid was reduced overall. I understand that.

4). Relationship between blowing pressure and generated lower fatty acid concentration A raw material of pig feces (water content: 73%) was used as a raw material, and a waste treatment apparatus shown in FIG. 6 having an internal volume of 41 m ³ was used. The diameter of the container bottom is 4200 mm. The apparatus configuration is as shown in FIG. A total of nine stirring blades were fixed in five stages around the rotation axis, and two or more stages were provided at equal intervals in the circumferential direction. The angle of the inclined surface of the stirring blade (5-stage configuration) is 20 degrees (lowermost stage), 40 degrees, 40 degrees, 40 degrees, 65 degrees (uppermost stage) from the lower stage, and the rotation direction width is 190 mm. The longitudinal length is 1900 mm. The rotation of the stirring blade is adjusted to 40 to 60 minutes per rotation, the static pressure (kPa) of the blower blower is changed, and the concentration of the lower fatty acid (mg / L) discharged from the exhaust port is investigated. It was. The static pressure was measured with a pressure gauge (KP15-17G manufactured by Nagano Keiki Co., Ltd.) provided in the middle of the path from the blower blower to the vent hole of the stirring blade. The air blowing was introduced by heating to 60 ° C. with a heater. Exhaust was performed constantly at 37 m ³ / min. The concentration of the lower fatty acid was measured by a liquid chromatographic method after 24 hours of condensation of exhaust gas. The treatment time was 1 day (24 hours), and the amount charged into the container was proportional to the blowing pressure, 3000 kg at 5 kPa, 4000 kg at 15 kPa, 5000 kg at 25 kPa, 8000 kg at 35 kPa, and 9000 kg at 45 kPa.

The measurement result of the concentration of the lower fatty acid with respect to each blowing pressure is shown in FIG. As shown in FIG. 11, it can be seen that the concentration of the lower fatty acid is reduced as a whole by increasing the blowing pressure (static pressure) in the apparatus of the present invention.

1 above. ~ 4. As shown in the above, in the waste treatment apparatus of the present invention, by adjusting the shape of the stirring blade and the blowing amount (blowing pressure), it is possible to have a high processing capacity and reduce the generation amount of malodorous substances. I understand.

The waste treatment apparatus of the present invention is low in cost and excellent in appearance, and can be stably treated with little influence from the external environment. In addition, relatively simple means are used, the processing capacity is high, and the amount of malodorous substances generated can be reduced. For this reason, it can be suitably used as a closed-type fermentation drying device (component) for composting organic waste such as livestock excretion discharged from livestock management bodies and food residues discharged from food industry establishments. .

DESCRIPTION OF SYMBOLS 1 Waste disposal apparatus 2 Container 3 Rotating shaft 4 Stirring blade 5 Machine room 6 Blower blower 7 Exhaust blower 8 Hydraulic unit 9 Outer wall 10 Introducing pipe 11 Outside air intake 12 Ventilation fan 13 Heater

Claims

An airtight cylindrical vertical container, a rotating shaft provided in the container in the vertical direction, a plurality of stirring blades fixed around the rotating shaft, and an air supply for sending outside air into the container Means and exhaust means for discharging the inside air accumulated in the container to the outside of the container, introducing the outside air into the container by the air supply means, and exhausting the inside air by the exhaust means, A waste treatment device for fermenting and drying organic waste put into the container from the upper part of the container while stirring with the stirring blade, composting and taking out from the lower part of the container,
The waste treatment apparatus includes an external heat insulation panel installed so as to cover at least a part of a cylindrical outer periphery of the container via a space.
The waste treatment apparatus according to claim 1, wherein an outer wall of the apparatus constituted by the external heat insulation panel has a rectangular tube shape that substantially circumscribes a cylindrical outer periphery of the container.
The waste treatment apparatus has heat exchange means for warming outside air introduced into the container from the air supply means by heat of exhaust from the exhaust means, and a cylindrical outer periphery of the container, the external heat insulating panel, The waste treatment apparatus according to claim 1, wherein the heat exchange means is installed in the space between the two.
The outer wall of the apparatus constituted by the external heat insulation panel is a rectangular tube shape that substantially circumscribes the outer circumference of the cylinder of the container,
The heat exchanging means is an exhaust passage portion that is installed in the space of the square cylindrical corner formed between the outer wall of the apparatus and the cylindrical outer periphery of the container and through which the exhaust discharged from the container passes. The waste treatment apparatus according to claim 3, wherein the waste treatment apparatus is configured to be configured to pass through outside air before introduction to the container installed through the exhaust passage portion.
The waste treatment apparatus according to claim 1, wherein the air supply means and the exhaust means are accommodated in the apparatus.
The agitating blades are spaced apart at a predetermined interval from the lower part to the upper part of the rotating shaft in the container, at least at least three stages, and at least one sheet at each stage, from the rotating shaft toward the inner wall of the container. It extends in a straight line,
The stirring blade has an inclined surface on the front side in the rotation direction,
The inclination angle of the inclined surface of the uppermost stirring blade with respect to the rotating surface of the stirring blade is 60 to 85 degrees, and the inclined angle of the inclined surface of the lowermost stirring blade with respect to the rotating surface of the stirring blade is 15 degrees. And the inclination angle of the inclined surfaces of the stirring blades other than the uppermost stage and the lowermost stage with respect to the rotating surface of the stirring blade is 35 degrees to 45 degrees,
2. The waste treatment apparatus according to claim 1, further comprising a vent hole that communicates with the air supply means in the lowermost stirring blade and introduces outside air sent from the air supply means into the container.
The internal volume of the container is at 15 m 3 or more, the air supply means for blowing rate (m 3) is the internal volume of the container per minute introduced through the vent during processing in said container (m 3) 7. The waste treatment apparatus according to claim 6, wherein the waste treatment apparatus is a means of 1/4 or more.
The waste treatment apparatus according to claim 6, wherein the air supply means is a means that a static pressure of air blown from the vent hole into the container at the time of processing is 15 kPa or more.
The waste treatment apparatus according to claim 6, wherein the waste treatment apparatus includes heat exchange means for heating the outside air introduced into the container from the air supply means by heat of exhaust from the exhaust means. apparatus.
A waste treatment method for composting organic waste using a waste treatment device,
The waste treatment apparatus according to claim 7, wherein the waste treatment apparatus is the waste treatment apparatus according to claim 7.