Waste treatment device

Abstract

To reduce a load of maintenance.SOLUTION: A waste treatment device 1 includes: a fermentation tank 10 as a treatment tank for decomposition treatment of waste by microbes; an exhaust unit 71 that releases exhaust air from the fermentation tank 10 to the air; and a blocking unit 50 that is provided in an exhaust passage in which the exhaust air from the fermentation tank 10 communicates with the exhaust unit 71, and blocks passage of dust included in the exhaust air from the fermentation tank 10 by allowing the dust to fall by a collision body 53 moving in the inside of a closed space 55 by an exhaust air flow from the exhaust unit 71.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a waste treatment device that reduces the volume and weight of food waste such as raw garbage and organic waste such as livestock excrement through fermentation and decomposition treatment by microorganisms or drying, and in particular to a waste treatment device that can reduce the maintenance burden. [Background technology]

[0002] In recent years, from the perspective of reducing the burden on the environment, efforts have been made to reduce the amount of food waste, such as raw garbage, incinerated and thereby reduce carbon dioxide emissions. In particular, in recent years, the cost of treating food waste as industrial waste has increased due to rising fuel costs and collection and transportation costs, and as a result, there has been strong interest in reusing food waste, for example, by fermenting food waste with microorganisms to decompose it and using the residue after the decomposition process as compost or soil activator, or the like, in other words, by recycling the residue from the decomposition process of food waste, etc. as a circulative resource.

[0003] Thus, composting devices (composters) have been known that use microorganisms to ferment and decompose food waste such as raw garbage and waste such as livestock manure, and turn them into compost. These composting devices generally include a fermentation device that uses microorganisms to ferment and decompose the organic matter in the waste, and a deodorization device that deodorizes the exhaust gas generated by fermentation in the fermentation device, and the exhaust gas generated in the fermentation device is sent to the deodorization device, where it is deodorized before being released into the atmosphere. In a composting apparatus that uses microorganisms to ferment and decompose food waste such as kitchen garbage and waste such as livestock manure, air is pumped into a fermentation tank into which the waste has been placed in order to promote the fermentation and decomposition of the waste.

[0004] However, when air is pumped into the fermentation tank, the waste is stirred in the fermentation tank, which accelerates the fermentation decomposition and drying of the waste, and the air is blown onto the waste in the fermentation tank, which makes it easier for dust particles from the waste particles being fermented and decomposed in the fermentation tank to fly up. In particular, since it is difficult to control the content and moisture content of the waste particles to be decomposed, there is a tendency to pump excessive air into the fermentation and drying of waste particles whose content and moisture content fluctuate in order to prevent poor fermentation (poor decomposition) and odor, which makes it easier for dust particles to be generated. For this reason, dust particles are easily scattered from the fermentation tank and are easily included in the exhaust gas. If the dust particles are directly sent to a deodorizing device, for example, a deodorizing device using activated carbon or the like is loaded, which adversely affects the operation of the deodorizing device and reduces the deodorizing efficiency. Therefore, conventionally, a dust collector is provided in the exhaust gas passageway that sends the exhaust gas from the fermenter to the deodorizer. For example, Patent Document 1 proposes a cyclone-type dust collector as a dust collector provided in the exhaust gas passageway that sends the exhaust gas from the fermenter to the deodorizer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-106587 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the case of a cyclone-type dust collector as in Patent Document 1, it is difficult to adjust the balance of exhaust and intake air to obtain good dust collection efficiency, and the device becomes complicated and the capital investment is costly. Moreover, when the exhaust gas introduced into the dust collector is cooled by a heat exchanger, the exhaust gas condenses in the heat exchanger, and the condensed water is collected together with the dust contained in the exhaust gas, so that a drainage treatment and a muddy material removal treatment are required to discharge the collected dust and wastewater to the outside, which is more time-consuming and costly.

[0007] On the other hand, there is also a method of collecting dust using a filter-type bag filter, for example, a cylindrical pleated filter, which is a low-cost dust collector. However, when collecting dust using a cylindrical pleated filter that allows air to circulate from the outside to the inside, the filter is prone to clogging and the dust collection power is easily reduced, which requires frequent heavy-duty cleaning to remove dust from the filter and replacement of the filter, which requires a lot of effort and cost in maintenance.

[0008] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a waste treatment device that can reduce the burden of maintenance. [Means for solving the problem]

[0009] The waste treatment device of the invention of claim 1 comprises a treatment tank in which waste is decomposed by microorganisms or reduced in volume and weight by drying, an exhaust section which releases exhaust gas from the treatment tank into the atmosphere, and a blocking section which is provided in an exhaust passage through which the exhaust gas from the treatment tank communicates with the exhaust section and forms a closed space of a predetermined volume, which houses an impactor which moves within the closed space due to the exhaust flow from the treatment tank, and which causes dust contained in the exhaust gas from the treatment tank to fall using the impactor and prevents the dust from passing through.

[0010] The treatment tank is a container (fermenter) in which waste is stored and the stored waste is subjected to fermentation and decomposition treatment, or a container in which the stored waste is dried with hot air, and usually has an air inlet and an exhaust port through which air is ventilated during waste treatment. The exhaust section is a location where the air (exhaust gas) discharged from the treatment tank is discharged into the atmosphere, and is usually provided in or connected to a deodorizing device, whereby the odorous components contained in the exhaust gas from the treatment tank are removed, and the exhaust gas from the treatment tank is deodorized and released into the atmosphere.

[0011] The blocking section is provided in an exhaust passage through which exhaust air from the treatment tank communicates with the exhaust section, and has an impact body that is housed in a closed space of a specified volume and moves within the closed space due to the exhaust flow from the treatment tank.While allowing air to pass from the treatment tank to the exhaust section, the impact body causes dust in the exhaust air from the treatment tank to fall, preventing the dust from passing through. The above-mentioned collision body is usually accommodated in multiple units within the closed space of the prevention section, and it is sufficient that the collision body is capable of moving around within the closed space of the prevention section due to the exhaust flow from the treatment tank.Usually, as the collision body moves around within the closed space of the prevention section, it collides with dust contained in the exhaust air from the treatment tank, causing the dust to fall, or collides with the inner surfaces that form the closed space, causing dust adhering to the inner surfaces to fall due to contact with the dust and vibrations caused by the collision. The closed space may be one that is closed so as to prevent the impacting object from escaping, and an opening (vent hole) that prevents the impacting object from escaping is permitted.

[0012] The blocking section of the waste treatment device of the invention of claim 2 covers an exhaust port provided above the treatment tank, and causes the dust contained in the exhaust gas to fall and return to the treatment tank through the exhaust port. The term "allowing the dust contained in the exhaust gas from the blocking section to fall and be returned to the treatment tank from the exhaust port" refers to, for example, when the exhaust port of the treatment tank is provided on the upper surface of the treatment tank, the exhaust gas rising from the exhaust port of the treatment tank flows into the blocking section covering the exhaust port of the treatment tank, but the passage of the dust contained in the exhaust gas is blocked by the blocking section, so that the exhaust gas falls from above to below and is returned to the treatment tank from the exhaust port on the upper surface of the treatment tank; when the exhaust port of the treatment tank is provided on one side of the treatment tank, a slope section is provided on the lower side of the blocking section that slopes downward toward the exhaust port of the treatment tank, so that the dust flows into the blocking section covering the exhaust port of the treatment tank, but the passage of the dust contained in the exhaust gas is blocked by the blocking section, so that the dust falls, and is guided toward the exhaust port by the slope section that slopes downward toward the exhaust port on the side surface of the treatment tank, and is returned to the treatment tank from the exhaust port. In addition, the upper side of the treatment tank may be the top surface side or the left or right side side of the treatment tank, and the blocking portion may be installed on the top surface side of the treatment tank or above the side surface side of the treatment tank.

[0013] The blocking section of the waste treatment device of the invention according to claim 3 has a filter for filtering the dust. The filter may be any material that can increase the dust removal rate and reduce the load on the deodorizing device that is usually installed downstream (exhaust side). For example, filters made of materials such as cotton, wool, natural fibers, synthetic fibers, glass fibers, and metals are used.

[0014] The blocking section of the waste treatment device of the invention of claim 4 has a bag-shaped filter cloth that filters the dust, the collision body is housed within the bag of the bag-shaped filter cloth that forms the closed space, and exhaust gas from the treatment tank is ventilated from the inner side to the outer side of the bag-shaped filter cloth. The filter cloth may be any material capable of increasing the dust removal rate and reducing the load on the deodorizing device that is usually provided on the downstream exhaust side, and may be either woven or nonwoven.

[0015] In the waste treatment device of the invention according to claim 5, the collision body is spherical. The above-mentioned spherical shape means that the overall shape of the collision body is approximately spherical, and may be approximately a perfect sphere or approximately an ellipsoid. It is not required that the entire body be spherical, and part of the outer surface may be flat.

[0016] In the waste treatment device of the invention according to claim 6, the impactor has a gap space. The impact body having gap spaces means that ventilation is permitted, and may have, for example, a mesh structure, a porous structure, or a lattice structure.

[0017] The waste treatment device of the invention of claim 7 comprises a treatment tank in which waste is decomposed by microorganisms or reduced in volume and weight by drying, an exhaust section which releases exhaust gas from the treatment tank into the atmosphere, and a blocking section which is provided in an exhaust passage through which the exhaust gas from the treatment tank communicates with the exhaust section, and which has a filter which ventilates the exhaust gas from the treatment tank from its inner side to its outer side, thereby preventing the passage of dust contained in the exhaust gas from the treatment tank, and which has an inner surface facing vertically downward to prevent the passage of the dust.

[0018] The treatment tank is a container (fermenter) in which waste is stored and the stored waste is subjected to fermentation and decomposition treatment, or a container in which the stored waste is dried with hot air, and usually has an air inlet and an exhaust port through which air is ventilated during waste treatment. The exhaust section is a location where the air (exhaust gas) discharged from the treatment tank is discharged into the atmosphere, and is usually provided in or connected to a deodorizing device, whereby the odorous components contained in the exhaust gas from the treatment tank are removed, and the exhaust gas from the treatment tank is deodorized and released into the atmosphere.

[0019] The blocking section is provided in an exhaust passage through which exhaust from the treatment tank communicates with the exhaust section, and has a filter that passes the exhaust from the treatment tank from the inner side to the outer side.The blocking section allows air to pass from the treatment tank to the exhaust section, but prevents dust in the exhaust from passing through by filtering with the filter, and the filter has an inner surface facing vertically downward to prevent the passage of the dust.

[0020] The blocking section of the waste treatment device of the invention of claim 8 is a bag-shaped filter cloth serving as a filtration filter that is placed over an exhaust port provided above the treatment tank, and causes dust contained in the exhaust air that has flowed into the bag of the bag-shaped filter cloth to fall and be returned to the treatment tank from the exhaust port. The above-mentioned blocking section allows the dust contained in the exhaust gas to fall and be returned to the treatment tank from the exhaust port, and means that, for example, in the case where the exhaust port of the treatment tank is provided on the upper surface of the treatment tank, a bag-shaped filter cloth is placed over the exhaust port with its opening facing downward, so that the exhaust gas rising from the exhaust port of the treatment tank flows into the bag of the bag-shaped filter cloth covering the exhaust port of the treatment tank, but the dust contained in the exhaust gas is prevented from passing through by the vertically downward inner surface of the bag-shaped filter cloth, and falls downward from above and is returned to the treatment tank from the exhaust port on the upper surface of the treatment tank. In the case where the exhaust port of the treatment tank is provided on the side of the treatment tank, a sloping portion sloping downward toward the exhaust port of the treatment tank is provided on the underside of the bag-shaped filter cloth, so that dust contained in the exhaust air flows into the bag of the bag-shaped filter cloth placed over the exhaust port of the treatment tank, but is prevented from passing through by the vertically downward inner surface of the bag-shaped filter cloth, and falls under its own weight.The dust is guided toward the exhaust port by the sloping portion sloping downward toward the exhaust port on the side of the treatment tank, and is returned to the treatment tank from the exhaust port. In addition, the upper side of the treatment tank may be the top surface side of the treatment tank or the left or right side side, and the bag-shaped filter cloth may be provided on the top surface side of the treatment tank or above the side surface of the treatment tank. Effect of the Invention

[0021] According to the waste treatment device of the invention of claim 1, an exhaust passage connecting a treatment tank in which waste is decomposed by microorganisms or reduced in volume by drying to an exhaust section which releases exhaust from the treatment tank into the atmosphere is provided with a blocking section which blocks the passage of dust contained in the exhaust gas from the treatment tank, and the blocking section houses an impact body moved by the exhaust flow from the treatment tank in a closed space, and the dust is caused to fall by the impact body which moves within the closed space due to the exhaust flow. That is, an impactor that is housed in the closed space of the blocking section and moves within the closed space due to the exhaust flow from the treatment tank is collided with dust floating in the exhaust from the treatment tank, causing the dust to fall, or the impactor is collided with the inner surface that forms a closed space of a specified volume that contains the impactor, causing the dust adhering thereto to fall. Therefore, the dust contained in the exhaust gas from the treatment tank is dropped by the impact body of the blocking section, so that the dropped dust can be returned to the treatment tank or collected at the point where it falls. Therefore, since the dust is not collected in the filter, or even if a filter is provided in the blocking section, the dust is unlikely to accumulate on the filter, the maintenance burden can be reduced.

[0022] According to the waste treatment device of the invention of claim 2, the blocking section covers the exhaust port provided above the treatment tank and causes the dust contained in the exhaust air to fall and be returned to the treatment tank from the exhaust port, thereby achieving the effect of claim 1 and eliminating the need for a separate operation to collect the fallen dust.

[0023] According to the waste treatment device of the invention of claim 3, the blocking section has a filtration filter that filters the dust, so in addition to the effect described in claim 1, it is possible to increase the dust removal rate and reduce the load on the deodorizing device provided downstream.

[0024] According to the waste treatment device of the invention of claim 4, the blocking section has a bag-shaped filter cloth that filters the dust, and exhaust air from the treatment tank is ventilated from the inner side to the outer side of the bag-shaped filter cloth, and the collision body is contained within the bag of the bag-shaped filter cloth. Therefore, in addition to the effect described in claim 1, it is possible to increase the dust removal rate and reduce the load on the deodorizing device installed downstream.

[0025] According to the waste treatment device of the invention of claim 5, since the impact body is spherical, it is easy for the impact body to move around in the closed space of the blocking part by the exhaust air flow from the treatment tank. Therefore, in addition to the effect of claim 1, the effect of dropping dust can be enhanced.

[0026] According to the waste treatment device of the invention of claim 6, the impact body has a clearance space, and is lightweight and has a structure that allows air to flow, so that the impact body can easily move around in the closed space of the blocking part with the exhaust air flow from the treatment tank. Therefore, in addition to the effect of claim 1, the effect of dropping dust can be enhanced.

[0027] According to the waste treatment device of the invention of claim 7, an exhaust passage connecting a treatment tank in which waste is decomposed by microorganisms or reduced in volume by drying to an exhaust section that releases exhaust from the treatment tank to the atmosphere is provided with a blocking section that blocks the passage of dust contained in the exhaust from the treatment tank, the blocking section having a filtration filter and allowing air to flow from the inner side to the outer side of the filtration filter, the filtration filter having a vertically downward inner surface that blocks the passage of the dust. Therefore, the vertically downward inner surface of the filter prevents the dust in the exhaust gas from rising, allowing the dust to fall by its own weight and making it difficult for dust to accumulate on the filter, thereby reducing the maintenance burden.

[0028] According to the waste treatment device of the invention of claim 8, the blocking section is a bag-shaped filter cloth as the filtration filter that is placed over an exhaust port provided on the upper side of the treatment tank, and the dust contained in the exhaust air falls and is returned to the treatment tank from the exhaust port. That is, the exhaust air from the exhaust port of the treatment tank flows into the bag of the bag-shaped filter cloth that is placed over the exhaust port of the treatment tank, but the dust contained in the exhaust air falls inside the bag because it is prevented from passing from the inner side to the outer side of the bag-shaped filter cloth, and is returned to the treatment tank from the exhaust port. Therefore, in addition to the effect of claim 7, there is no need for a separate operation to collect the fallen dust. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a schematic configuration diagram illustrating a waste treatment device according to a first embodiment of the present invention, as viewed from one side. [Diagram 2] FIG. 2 is a schematic configuration diagram illustrating the waste treatment device according to the first embodiment of the present invention as viewed from another side. [Diagram 3] FIG. 3 is a schematic diagram illustrating the configuration of the blocking section of the waste treatment device according to the first embodiment of the present invention. [Figure 4]Figure 4(a) is an explanatory diagram illustrating the blocking section when exhaust is being performed from the fermentation tank of the waste treatment device of embodiment 1 of the present invention, and Figure 4(b) is an explanatory diagram illustrating the blocking section when exhaust from the fermentation tank of the waste treatment device of embodiment 1 of the present invention is stopped. [Diagram 5] FIG. 5 is a perspective see-through view illustrating a blocking portion of the waste treatment device according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a perspective see-through view for explaining another example of the bag-shaped filter cloth in the blocking section of the waste treatment device according to the first embodiment of the present invention. [Figure 7] Figure 7(a) is a schematic diagram illustrating the blocking section of a waste treatment device related to variant 1 of embodiment 1 of the present invention, and Figure 7(b) is a schematic diagram illustrating the blocking section of a waste treatment device related to variant 2 of embodiment 1 of the present invention. [Figure 8] FIG. 8 is a schematic diagram illustrating a waste treatment device according to a third modification of the first embodiment of the present invention. [Figure 9] FIG. 9 is a schematic diagram illustrating a waste treatment device according to a fourth modified example of the first embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram illustrating the configuration of a blocking section of a waste treatment device according to a second embodiment of the present invention. [Figure 11] FIG. 11 is an explanatory view for explaining a state in which a bag-shaped filter cloth of a blocking section of a waste treatment device according to a second embodiment of the present invention is vibrated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each embodiment, the same symbols and the same reference characters refer to the same or corresponding functional parts, and the same symbols and the same reference characters between the respective embodiments refer to functional parts common to those embodiments, so duplicated detailed explanations will be omitted here.

[0031] [Embodiment 1] First, a waste treatment device 1 according to a first embodiment of the present invention will be described with reference to Figs. 1 to 5. The first embodiment of the present invention illustrates the case where the waste treatment device of the present invention is applied to a bio-composter. That is, the waste treatment device 1 according to the first embodiment is applied to a bio-composting device that uses the action of microorganisms to decompose organic waste into water, carbon dioxide gas, and inorganic matter, thereby reducing the weight and volume of the waste.

[0032] As shown in Figures 1 and 2, the waste treatment device 1 of this embodiment 1 has a fermentation tank 10 as a treatment tank for fermenting and decomposing waste using microorganisms, an exhaust section 71 for releasing exhaust air from the fermentation tank 10 into the atmosphere, and a blocking section 50 that is provided in an exhaust passage that connects the exhaust air from the fermentation tank 10 to the exhaust section 71 and forms a closed space 55 of a predetermined volume that accommodates a ball-shaped impact body 53 using a bag-shaped filter cloth (filter cloth bag) 52 as a filtration filter, and blocks the passage of dust contained in the exhaust air from the fermentation tank 10.

[0033] As shown in Figs. 1 and 2, the fermentation tank 10 is a container into which food waste (e.g., vegetables, fruits, marine products, meat, rice, wheat, soybean pulp, tofu, tea lees, sake lees, mirin lees, and other brewing by-products, fruit and vegetable juices, tempura scraps, and processed foods) and other food waste, livestock waste (e.g., cow manure, pig manure, chicken manure, and horse manure), sludge (septic tank), and other organic waste (hereinafter simply referred to as "waste") generated in factories, stores, and the like is introduced through an inlet 41 provided on the top of the waste treatment device 1, and the waste is fermented and decomposed by microorganisms. The tank contains an agitator 20 equipped with a rotating shaft 21 and a number of agitating blades 22 provided around the shaft, as an agitation means for agitating and breaking down the waste. The fermentation tank 10 is made of metal, for example, and is usually of a heat-insulated structure.

[0034] In the first embodiment, as shown in FIG. 2, in the fermenter 10, a rotating shaft 21 is rotatably supported on the wall side of the fermenter 10 and is provided in the horizontal direction (left and right direction), and a plurality of stirring blades 22 are fixed around the rotating shaft 21 at a predetermined interval, so that the stirring blades 22 rotate together with the rotating shaft 21, and the waste introduced into the fermenter 10 can be stirred by the stirring blades 22. That is, the rotating shaft 21 extending in a substantially horizontal direction in the fermenter 10 is rotated by a rotary drive means (not shown) provided outside the tank, and the stirring blades 22 attached to the rotating shaft 21 rotate, so that the waste in the fermenter 10 is stirred and broken down. As a result, oxygen necessary for fermentation by microorganisms is sufficiently supplied to the waste, and the waste can be efficiently fermented and decomposed, and the weight and volume of the waste can be reduced. The form of the stirring blades 22 is not particularly limited, and examples thereof include a paddle type, a screw type, a spiral type (drill type, auger type), and the like. The agitating blades 22 disposed around the rotating shaft 21 may be arranged so that adjacent agitating blades 22 are parallel to each other, or may be arranged with a phase shift of a predetermined angle.

[0035] The fermentation tank 10 has an air inlet 16 and an exhaust port 17, and outside air (air) is introduced into the tank from outside the tank through the air inlet 16, and the air inside the tank is exhausted to the outside of the tank through the exhaust port 17. In the waste treatment device 1 of this embodiment 1, outside air is blown (pressurized) into the fermentation tank 10 through the air supply passage from a blower or other air sending device 30, which serves as an air supply means for sending outside air (air) into the fermentation tank 10, via the air supply port 16, and the air inside the tank is exhausted outside the tank through the exhaust port 17, and is released into the atmosphere from the exhaust section 71 through an exhaust passage consisting of the blocking section 50, the pipe 81, and the deodorizing device 70. That is, in the waste treatment device 1 of this embodiment 1, air is pressurized from the blower 30 into the fermentation tank 10 to create a positive pressure inside the fermentation tank 10, and even without providing an intake means on the exhaust side to suck in the air inside the fermentation tank 10, the air inside the fermentation tank 10 is exhausted from the exhaust port 17, passes through the blocking section 50 and the pipe line 81, is deodorized in the deodorizing device 70, and then is released into the atmosphere.

[0036] In the first embodiment, the fermenter 10 is designed to have an airtight structure that blocks the inside of the tank from the outside air, and is structured to prevent odors from escaping from inside the tank, and the fermenter 10 is made airtight and maintained at positive pressure during fermentation and decomposition of waste by microorganisms. That is, during fermentation and decomposition of waste by microorganisms, outside air is pressurized and sent into the fermenter 10 by the blower 30, and the amount of air introduced into the fermenter 10 is set to be greater than the amount of air exhausted from the fermenter 10, so that the pressure inside the fermenter 10 is higher than that outside the tank and is kept in a positive pressure state. This promotes fermentation due to activation and proliferation of the microorganisms, and promotes decomposition and drying of the waste.

[0037] At this time, it is preferable to heat the air blown from the blower 30 to the fermenter 10. This can promote drying of the waste and also promote fermentation through activation and proliferation of microorganisms, thereby accelerating the decomposition treatment of the waste. A heating means such as a heater can be provided in the air supply passage such as a pipe from the blower 30 to the fermenter 10, and when an air supply pipe is provided in the fermenter 10 as described below, a heating means such as a heater can also be provided there.

[0038] Here, the air inlet 16 through which the air from the blower 30 is introduced may be provided on the wall side of the fermenter 10, or an air inlet pipe (not shown) communicating with the blower 30 may be provided inside the fermenter 10, and a plurality of air inlets 16 may be provided on the air inlet pipe. In the latter case, the air sent from the blower 30 is blown over a wide area against the waste to be fermented and decomposed, making it possible to bring the air into contact with the waste evenly and efficiently, thereby making it possible to dry the waste, promote fermentation decomposition, and prevent unevenness. In particular, a heater such as a sheath heater may be installed inside the air inlet pipe, and the air to be supplied to the waste may be heated by the heater before being blown onto the waste, thereby promoting the drying of the waste, and promoting the fermentation caused by the activation and proliferation of microorganisms, thereby promoting the decomposition of the waste. Heating the air just before supplying it to the waste also improves energy efficiency. The number of such air supply pipes may be one or more, and they are provided, for example, in a position within the fermenter 10 above the rotary shaft 21 and the waste contained within the fermenter 10, and at a position that does not interfere with the agitator blades 22. When the air supply pipe is provided at an upper position within the fermenter 10 and multiple air supply ports 16 are provided thereon, it is preferable that the air supply pipes be configured to blow air downwards and onto the waste, and may be in the form of a nozzle. Furthermore, a screw may be provided within the air supply pipe so that even if waste enters the air supply pipe through the air supply port 16, the waste can be discharged by rotating the screw.

[0039] In the first embodiment, an inlet 41 that can be freely sealed with an openable lid (not shown) is provided at the top of the fermenter 10 in a position separate from the exhaust port 17 that exhausts the air inside the fermenter 10, and waste can be fed into the fermenter 10 through this inlet 41. The waste is placed in a feeding container (not shown), which is then lifted upward with a feed lift (not shown) and the feeding container is tilted, whereby the waste is fed into the fermenter 10 through the inlet 41 at the top. Furthermore, one side of the fermenter 10 is provided with an outlet 43 which can be freely sealed with an opening / closing lid (not shown) for removing (discharging) the residue after the waste has been fermented and decomposed by the microorganisms.

[0040] An exhaust port 17 for exhausting the air inside the fermentation tank 10 to the outside of the tank is provided in the upper wall of the fermentation tank 10 at a position separate from the inlet 41 through which the waste is introduced. In this embodiment 1, the upper wall of the fermentation tank 10 has a plurality of exhaust ports 17 (two in the figure). Each exhaust port 17 is provided with a wire mesh 18 that functions as a filter, and the wire mesh 18 can prevent the discharge of coarse objects (foreign objects) in the waste of the fermentation tank 10 so that they are not discharged to the outside of the tank together with the exhaust air.

[0041] In the first embodiment, a blocking section 50 is connected to an exhaust port 17 formed in the upper wall of the fermenter 10, and blocks dust contained in the exhaust air from the fermenter 10 from passing through. Specifically, as shown in Figures 3 to 5, the prevention section 50 of this embodiment 1 is installed on the upper surface of the fermenter 10 and is composed of a metal box-shaped lid 51 having an approximately rectangular parallelepiped shape forming an internal space of a predetermined volume, a bag-shaped filter cloth 52 provided inside the box-shaped lid 51 and attached removably to each exhaust port 17, and a ball-shaped impact body 53 placed inside the bag of the bag-shaped filter cloth 52.

[0042] The box-shaped lid 51 is formed on the upper surface of the fermenter 10 by fixing and installing a generally rectangular parallelepiped lid body with an opening at the bottom to the upper surface of the fermenter 10 so as to collectively cover the multiple exhaust ports 17 formed on the upper part of the fermenter 10, i.e., to surround and cover the multiple exhaust ports 17, and defines a predetermined closed space, the upper part of which can be opened and closed by opening and closing the openable and closable lid 51a. In addition, the side of the box-shaped lid 51 has an exhaust port 57 connected to a pipe 81 connected to the deodorizing device 70. The inside of this box-shaped lid 51 is also designed to be an airtight structure that is isolated from the outside air, making it difficult for odors to leak out.

[0043] The bag-shaped filter cloth 52 provided inside the box-shaped lid 51 has openings large enough to allow air to pass through, that is, to allow ventilation, but to prevent the passage of dust contained in the exhaust air. The bag opening side of the filter cloth 52 is detachably attached to the exhaust port 17 of the fermenter 10 by a mounting device 54 such as a ring-shaped fastener. That is, the bag-shaped filter cloth 52 covers the exhaust port 17 of the fermenter 10. Therefore, the exhaust air from the exhaust port 17 of the fermenter 10 is introduced into the bag of the bag-shaped filter cloth 52 and passes from inside the bag to outside the bag. The filter cloth 52 may be, for example, a woven fabric such as a satin weave, plain weave, or twill weave made of short fibers (spun yarn, spun yarn, etc.), long fibers (multifilament yarn, etc.), single fibers (monofilament yarn, etc.), or split-type ultrafine fiber yarns, etc., made of synthetic fibers or natural fibers such as polypropylene, nylon, aromatic polyamide, vinylidene chloride, vinylon, or cotton, or a nonwoven fabric (melt blown), laminate, etc. In particular, the bag-shaped filter cloth 52 in the present embodiment 1 has an end portion opposite to the cylindrical bag mouth side formed into a substantially curved, arc-shaped shape, so that a wide contact surface with the impact body 53 can be obtained, and accumulation of dust can be prevented.

[0044] A plurality of ball-shaped impact bodies 53 are housed inside the bag-shaped filter cloth 52. That is, in the present embodiment 1, the exhaust port 17 in which the wire mesh 18 is installed is covered with the bag-shaped filter cloth 52 to form a closed space 55 inside the bag-shaped filter cloth 52, and a plurality of ball-shaped impact bodies 53 are housed in the closed space 55. The collision body 53 may be any one that can rise and fall and move around in the bag of the bag-shaped filter cloth 52 by the exhaust flow from the exhaust port 17 of the fermenter 10. For example, a substantially spherical one made of resin or the like and having a mesh-like, porous, strip-like, lattice-like, or other gap space 53a is used. That is, if it is a substantially spherical one made of resin, it is easy to rise and fall and move around in the bag of the bag-shaped filter cloth 52 even with a small pressure and amount of exhaust flow from the exhaust port 17. In addition, since it is lightweight and has a form that allows air to flow, it is easy to rise and fall and move around in the bag-shaped filter cloth 52 even with a small pressure and amount of exhaust flow from the exhaust port 17. Furthermore, if it has a form with gap space 53a, the surface area can be increased, thereby increasing the contact rate and contact frequency with the dust exhausted from the exhaust port 17, and it is possible to improve the effect of dust colliding and dropping.

[0045] Thus, in the blocking section 50 of the first embodiment, inside the box-shaped lid 51 that covers the multiple exhaust ports 17 and has an airtight structure, bag-shaped filter cloths 52 are attached to each exhaust port 17 provided at the top of the fermenter 10, and the exhaust ports 17 are covered with the bag-shaped filter cloths 52, so that the exhaust air rising from the exhaust ports 17 provided at the top of the fermenter 10 enters the closed space 55 in the bag of the bag-shaped filter cloth 52 and passes from its inner side to its outer side. An exhaust port 57 is provided on the side of the box-shaped lid 51, and a pipe 81 connected to the exhaust port 57 and connected to the deodorizing device 70, so that the exhaust air passing from the inner side to the outer side of the bag-shaped filter cloth 52 is discharged from the exhaust port 57 of the box-shaped lid 51 and introduced into the deodorizing device 70 via the pipe 81. In addition, the blocking section 50 is connected to the exhaust port 17 of the fermenter 10, and the blocking section 50 is connected to the deodorizer 70 via a pipe 81. An exhaust section 71 is provided downstream of the deodorizer 70. The blocking section 50, the pipe 81, and the deodorizer 70 form an exhaust passage through which exhaust from the fermenter 10 communicates with the exhaust section 71, i.e., an exhaust passage that allows ventilation from the fermenter 10 to the exhaust section 71.

[0046] In the blocking section 50 of the present embodiment 1, inside the box-shaped lid 51 covering the multiple exhaust ports 17, the bag-mouth side of the bag-shaped filter cloth 52 is attached so as to cover each exhaust port 17 in which the wire mesh 18 of the fermenter 10 is installed, and multiple ball-shaped collision bodies 53 are accommodated in the closed space 55 in the bag of the bag-shaped filter cloth 52, so that the exhaust flow from the exhaust port 17 formed at the top of the fermenter 10 causes the multiple ball-shaped collision bodies 53 to rise and fall in the closed space 55 in the bag of the bag-shaped filter cloth 52, and move and diffuse randomly. As a result, dust suspended in the exhaust air that flows into the bag of the bag-shaped filter cloth 52 from the exhaust port 17 of the fermenter 10 collides with the collision body 53 and falls. Also, the collision body 53 collides with the inner surface of the bag-shaped filter cloth 52 and collides with and comes into contact with the dust adhering to the inner surface of the bag-shaped filter cloth 52, causing the dust to fall. Furthermore, the vibrations caused when the collision body 53 collides with the inner surface of the bag-shaped filter cloth 52 also cause the dust adhering to the inner surface of the filter cloth 52 to fall. In the present embodiment 1, the bag-shaped filter cloth 52 is placed so as to cover the upper side of the exhaust port 17 provided at the top of the fermenter 10, and the bag-shaped filter cloth 52 opens toward the exhaust port 17 on the vertically lower side. Therefore, the dust that falls as a result of the collision body 53 colliding with and coming into contact with the dust within the bag of the bag-shaped filter cloth 52 and as a result of the collision body 53 colliding with the filter cloth 52 falls back into the fermenter 10 from the exhaust port 17 under its own weight.

[0047] That is, in this embodiment 1, a plurality of ball-shaped collision bodies 53 are contained in a closed space 55 inside a bag of a bag-shaped filter cloth 52 that is placed over the exhaust port 17 of the fermenter 10 at the upper outside of the fermenter 10, and the plurality of ball-shaped collision bodies 53 are made to move around inside the closed space 55 formed by the filter cloth 52 due to the pressure and flow rate of the exhaust air from the exhaust port 17. The collision bodies 53 are made to collide with dust floating in the exhaust air that flows into the bag of the bag-shaped filter cloth 52 from the exhaust port 17 and dust attached to the inner surface of the bag-shaped filter cloth 52, causing the dust to fall. Also, the collision bodies 53 are made to collide with the inner surface of the bag-shaped filter cloth 52 to vibrate the bag-shaped filter cloth 52, causing the dust attached to the inner surface of the bag-shaped filter cloth 52 to fall.

[0048] Furthermore, in this embodiment 1, a bag-shaped filter cloth 52 is placed to cover the above of each exhaust port 17 provided at the top of the fermenter 10, and the exhaust air from the exhaust port 17 passes from the inner side to the outer side of the bag-shaped filter cloth 52.Therefore, the exhaust air flow from the exhaust port 17 is blown onto the inner side of the bag-shaped filter cloth 52, causing dust to collide with the inner side of the bag-shaped filter cloth 52 and fall, or the pressure of the exhaust air flow can cause dust adhering to the inner side of the bag-shaped filter cloth 52 to fall. Furthermore, the flexibility of the bag-shaped filter cloth 52 allows it to expand with the exhaust gas flow from the fermenter 10 (see FIG. 4(a)) and to contract when the exhaust gas stops (see FIG. 4(b)). This movement allows dust adhering to the inner surface of the bag-shaped filter cloth 52 to fall off. In addition, in this embodiment 1, a bag-shaped filter cloth 52 is placed so as to cover the upper part of the exhaust port 17 provided at the top of the fermenter 10, and the bag-shaped filter cloth 52 opens toward the exhaust port 17 at the vertically downward side. Since the bag-shaped filter cloth 52 has an inner surface facing vertically downward, dust in the exhaust gas that flows into the bag-shaped filter cloth 52 is prevented from passing from the inner side to the outer side of the filter cloth 52. In particular, dust that reaches the vertically downward inner side of the bag-shaped filter cloth 52, i.e., dust that is pressed against the vertically downward inner side of the filter cloth 52 by the exhaust flow, tends to fall under its own weight when exhaust gas is stopped, etc., and the dust that has flowed into the bag-shaped filter cloth 52 can be returned to the fermenter 10 from the exhaust port 17 by gravity.

[0049] Therefore, in the first embodiment, dust is less likely to accumulate on the bag-shaped filter cloth 52, and the maintenance burden can be reduced.

[0050] That is, in the blocking section 50 of the first embodiment, the dust is dropped by the impactor 53 inside the bag of the bag-shaped filter cloth 52, and the bag-shaped filter cloth 52 blocks the passage of the dust. In particular, in this embodiment 1, each exhaust port 17 of the fermenter 10 is covered with a bag-shaped filter cloth 52 so that the exhaust air rising from the exhaust port 17 passes from the inner side to the outer side of the bag-shaped filter cloth 52, and the inner side of the bag-shaped filter cloth 52 prevents dust from passing through. By covering the upper part of the exhaust port 17 of the fermenter 10 with the opening of the bag-shaped filter cloth 52 facing downward, the bag-shaped filter cloth 52 has an inner surface facing vertically downward, so that dust that reaches the inner side of the bag-shaped filter cloth 52 tends to fall under its own weight, and the dust that has flowed into the bag-shaped filter cloth 52 can be returned to the fermenter 10 from the exhaust port 17. Furthermore, a collision body 53 that moves around due to the exhaust air flow from the exhaust port 17 is housed inside the bag of the bag-shaped filter cloth 52, and the collision body 53 moves around due to the exhaust air flow inside the bag of the bag-shaped filter cloth 52, colliding with dust contained in the exhaust air and causing the dust to fall, or colliding with the inner side of the bag-shaped filter cloth 52 and causing the dust adhering to the inner surface of the bag-shaped filter cloth 52 to fall due to vibration or contact with the dust. And, the bag-shaped filter cloth 52 that houses the collision body 53 and forms the closed space 55 covers each exhaust port 17 of the fermenter 10, so that the dust that has fallen inside the bag-shaped filter cloth 52 is returned to the fermenter 10 from the exhaust port 17 by its own weight.

[0051] Thus, in the blocking section 50 of this embodiment 1, the collision body 53 and the filter cloth 52 prevent the passage of dust contained in the exhaust air from the fermenter 10. That is, in the blocking section 50, the dust is discharged from the exhaust port 57 of the box-shaped lid 51, and is prevented from flowing into the downstream deodorizing device 70, thereby removing dust from the exhaust air. In the waste treatment device 1 of this embodiment 1, the blocking section 50 is provided on the top surface of the fermenter 10, so that it does not take up any lateral installation space. In particular, dust is dropped by the impact body 53, thereby preventing dust from accumulating on the inner surface of the bag-shaped filter cloth 52. In addition, by covering the bag-shaped filter cloth 52 above the exhaust port 17 of the fermenter 10 with the opening of the bag-shaped filter cloth 52 facing downward, the filter cloth 52 has an inner surface facing vertically downward, so that dust that has reached the inner surface of the bag-shaped filter cloth 52 can be dropped by its own weight, preventing dust from accumulating on the inner surface of the bag-shaped filter cloth 52. Furthermore, dust is prevented from accumulating on the inner surface of the bag-shaped filter cloth 52 by the pressure of the exhaust flow from the exhaust port 17 blown onto the inner surface of the bag-shaped filter cloth 52 and the movement of the bag-shaped filter cloth 52 expanding and contracting due to the strength of the exhaust flow. Therefore, in this embodiment 1, dust can be prevented from accumulating on the bag-shaped filter cloth 52, and since dust is less likely to adhere to the inner surface of the filter cloth 52, the maintenance burden for removing clogging caused by dust can be reduced.

[0052] In this embodiment 1, although the filter cloth 52 is attached above the exhaust port 17 inside the box-shaped lid 51, the filter cloth 52 is bag-shaped and configured to allow air to circulate from the inner side to the outer side. Therefore, even if dust accumulates inside the bag-shaped filter cloth 52, the flexibility of the bag-shaped filter cloth 52 makes it possible to shake off the dust and return it to the fermentation tank 10 from the bag opening via the exhaust port 17.

[0053] That is, in the first embodiment, the upper part of the box-shaped lid 51 is freely openable by the openable lid 51a which can be freely closed, and therefore, by opening the openable lid 51a to open the upper part of the box-shaped lid 51 and inserting a hand into the inside of the box-shaped lid 51 to apply vibrations to the filter cloth 52 by hitting, pressing, shaking, pulling, or the like (see FIG. 11), it is possible to easily shake off the dust accumulated inside the bag-shaped filter cloth 52. At this time, in a state where the bag-shaped filter cloth 52 is attached to the exhaust port 17 without removing the bag-shaped filter cloth 52, the dust accumulated inside the bag-shaped filter cloth 52 can be shaken off and the clogging of the filter cloth 52 can be easily eliminated. And, since the bag-shaped filter cloth 52 is placed above each exhaust port 17 of the fermenter 10 with its opening facing downward, the dust shaken off from the filter cloth 52 in the bag is returned to the fermenter 10 from the exhaust port 17 by its own weight. Therefore, even if the filter cloth 52 is used, maintenance for removing the dust adhering to the filter cloth 52 can be easily performed (see FIG. 11).

[0054] Maintenance of the bag-shaped filter cloth 52 may be performed, for example, by measuring and detecting the pressure inside the airtight box-shaped lid 51 and the pressure of the exhaust gas after passing through the box-shaped lid 51, and when the pressure exceeds a predetermined threshold value, manually vibrating the filter cloth 52 as described above, so that the dust that has adhered to and accumulated on the inside of the bag-shaped filter cloth 52 falls downward and is returned to the fermenter 10. Alternatively, a vibration means that is activated by a drive and vibrates the filter cloth 52 may be provided, and the vibration means may be used to vibrate the filter cloth 52, shaking off the dust that has adhered to and accumulated on the inside of the bag-shaped filter cloth 52 and returning it to the fermenter 10.

[0055] Furthermore, even if fine dust accumulates on the inside of filter cloth 52 after long-term use, causing a large pressure loss, in this embodiment 1, the bag-shaped filter cloth 52 is removably attached to exhaust outlet 17 of fermenter 10 by mounting fixture 54, so that it is possible to remove the bag-shaped filter cloth 52 from exhaust outlet 17 of fermenter 10 and clean or replace the bag-shaped filter cloth 52.

[0056] In this manner, in this embodiment 1, the blocking section 50 is constituted by an airtight box-shaped lid 51 covering the upper part of the multiple exhaust ports 17 formed at the top of the fermenter 10, a bag-shaped filter cloth 52 attached detachably to the exhaust port 17 of the fermenter 10 inside the box-shaped lid 51, and a plurality of ball-shaped collision bodies 53 contained in a closed space 55 formed by attaching the bag-shaped filter cloth 52 to the exhaust port 17. The pressure and flow of the exhaust air rising from the exhaust port 17 of the fermenter 10 causes the multiple collision bodies 53 to move around within the bags of the bag-shaped filter cloth 52 in the blocking section 50, causing dust contained in the exhaust air from the exhaust port 17 of the fermenter 10 to collide with the collision bodies 53 and fall. Also, the collision bodies 53 collide with the inner surface of the bag-shaped filter cloth 52, causing the dust adhering to the bag-shaped filter cloth 52 to fall, and the dust contained in the exhaust air is returned to the fermenter 10 through the exhaust port 17. In addition, because a bag-shaped filter cloth 52 is placed above the exhaust port 17 of the fermenter 10 with its opening facing downward, dust contained in the exhaust air from the exhaust port 17 is prevented from passing by the inner surface of the bag-shaped filter cloth 52. In particular, because the inner surface of the filter cloth 52 faces vertically downward, dust prevented from passing by the inner surface of the filter cloth 52 tends to fall by its own weight and is returned from the exhaust port 17 into the fermenter 10. In this way, the collision body 53 and the bag-shaped filter cloth 52 prevent dust contained in the exhaust air from the exhaust port 17 from passing through.

[0057] The exhaust air from which dust has been removed (de-dusted) by the blocking section 50 flows out from the exhaust port 57 of the blocking section 50 and through the pipe 81 into the deodorizing device 70, where the odorous components are removed and the air is deodorized (neutralized), and then released into the atmosphere from the exhaust section 71 located downstream of the deodorizing device 70.

[0058] As the deodorizing device 70, for example, a porous material such as activated carbon is used, and while the exhaust gas from the fermenter 10 rises inside a tank filled with a porous material such as activated carbon, odorous components contained in the exhaust gas from the fermenter 10, for example, sulfur compounds such as ammonia, lower fatty acids, and methyl sulfide, are adsorbed by the porous material and removed. Alternatively, deodorization may be performed by an oxidation reaction using a catalyst. In this way, the exhaust gas from the fermentation tank 10 is deodorized in the deodorization device 70, and the deodorized exhaust gas is released into the atmosphere at an exhaust section 71 located downstream of the deodorization device 70 (above the deodorization device 70 in Figures 1 and 2).

[0059] In addition, the waste treatment device 1 is usually equipped with a heating means such as a heater for heating the fermentation tank 10 and the air blown from the blower 30, an agitator drive means such as a hydraulic motor or an electric motor for rotating the rotating shaft 21 of the agitator 20 in the fermentation tank 10, a pressure sensor for detecting the pressure inside the fermentation tank 10 and the exhaust pressure, a control means for controlling the operation of the agitator drive means, heating means, blower, etc., and an input means for inputting commands to the control means.

[0060] In the agitator driving means, for example, the rotation output of a motor or the like is transmitted to the rotating shaft 21 via a power transmission mechanism such as a gear. Note that the rotating shaft 21 may be rotatably driven in only one direction, or may be rotatably driven in both the forward and reverse directions. The control means is configured, for example, using a computer having a central processing unit such as a CPU (Central Processing Unit) and a storage unit such as a ROM (Read Only Memory) and a RAM (Random Access Memory). Based on, for example, the weight of the waste detected and calculated by a load cell or the like, the pressure inside the fermenter 10 measured by a pressure sensor or the like, the elapsed time of waste treatment, and the temperature and humidity inside the fermenter 10 measured by a temperature sensor, humidity sensor or the like, the control means controls the rotation speed and intermittent or continuous operation of the rotating shaft 21 of the agitator 20 by controlling the output of a motor or the like, controls the airflow rate and operation of the blower 30, and controls the temperature of the fermenter 10 by controlling the temperature of a heating means such as a heater, thereby enabling efficient fermentation and decomposition treatment of the waste and also enabling energy saving.

[0061] In the waste treatment device 1, the pressure inside the fermenter 10 measured by a pressure sensor may be input to the control device by an input device, and when the pressure exceeds a predetermined threshold, an alarm may be issued to inform that an abnormal load has been reached or that air is leaking. When a pressure abnormality is detected, all or some of the operations of the device 1 (e.g., blowing air, driving the agitator 20, heating, etc.) may be stopped for safety. Also, a valve such as a solenoid valve for adjusting pressure may be provided in the exhaust path, etc., and when a pressure abnormality is detected, the valve may be opened to reduce the pressure. Furthermore, as described above, the pressure sensor may also measure the pressure of the exhaust from the blocking section 50, and when the pressure inside the box-shaped lid 51 increases and exceeds a predetermined threshold, it may notify the user that dust has accumulated inside the bag-shaped filter cloth 52 and caused clogging. That is, it may be possible to vibrate the bag-shaped filter cloth 52 to notify the user that it is time to drop the dust adhering to the inside of the bag-shaped filter cloth 52 back to the fermenter 10 side. If clogging of the bag-shaped filter cloth 52 is determined by pressure measurement in this way, it is possible to save the effort and labor of opening the box-shaped lid 51 and checking the state of the bag-shaped filter cloth 52.

[0062] The waste treatment device 1 of the first embodiment is provided with an input means such as an operation unit operated by a user, worker, etc., and a control means for controlling the operation of the device 1 based on a command from the input means, so that when waste is input into the fermentation tank 10 through the input port 41 and the device 1 is instructed to start operating by the input means, the control means operates the agitator drive means, the blower 30, etc., and while the waste is agitated in the fermentation tank 10 by the agitator 20, the blower 30 blows outside air into the fermentation tank 10 through the air inlet 16, thereby carrying out a fermentation and decomposition treatment of the waste. At this time, the air in the fermentation tank 10 is exhausted through the exhaust port 17, passes through an exhaust passage consisting of the blocking section 50, the duct 81, the deodorizing device 70, etc., and is released into the atmosphere from the exhaust section 71.

[0063] Thus, in the waste treatment device 1 of the present embodiment 1, waste is charged into the fermenter 10 from the charging port 41, and the waste is fermented and decomposed by microorganisms in the fermenter 10. At this time, the waste is preferably mixed with a bacteria bed material (substrate) containing microorganisms and auxiliary materials that promote the fermentation decomposition of the waste, and residues remaining after the fermentation decomposition treatment of the waste, and is subjected to the fermentation decomposition treatment by the microorganisms. When the waste is fermented and decomposed by microorganisms in the fermenter 10, the waste is agitated by the agitator 20, and outside air (air) is blown (pressurized) into the fermenter 10 from the blower 30 to aerate the fermenter 10 (aerating and agitating) while the waste is decomposed. This supplies oxygen to the waste in the fermenter 10, promoting the fermentation decomposition and fragmentation of the waste, and promoting the evaporation and drying of moisture in the waste. That is, by aerating the fermenter 10 and agitating the waste, oxygen is continuously supplied to the microorganisms, promoting aerobic fermentation and decomposition due to the activation and proliferation of the microorganisms, and also promoting the drying of the waste by blowing outside air from the blower 30.

[0064] Furthermore, by heating the fermenter 10 with a heating means or by sending heated air into the fermenter 10, and further by raising the temperature of the waste to, for example, 40 to 90°C by the heat of fermentation by the microorganisms, the fermentation decomposition process due to activation and proliferation of the microorganisms is promoted, and drying is also promoted. Note that in the waste treatment device 1 of this embodiment 1, water in the waste is evaporated and released to the outside together with the exhaust, so no wastewater treatment is required.

[0065] Furthermore, in this embodiment 1, during the fermentation and decomposition treatment of waste, outside air is pressure-fed into the fermentation tank 10 by the blower 30, and the air blown from the blower 30 and flowing into the fermentation tank 10 from the air inlet 16 of the fermentation tank 10, i.e., the air inside the fermentation tank 10, flows out from the exhaust port 17 provided at the top of the fermentation tank 10, thereby ventilating the fermentation tank 10. The exhaust air flowing out from the exhaust port 17 at the top of the fermentation tank 10 passes through a bag-shaped filter cloth 52 attached to the exhaust port 17 in the box-shaped lid 51 constituting the blocking section 50 from its inner side to its outer side, passes through the exhaust port 57 of the box-shaped lid 51, and flows through the pipe 81 into the deodorizing device 70, where it is deodorized and then released into the outside air from the exhaust section 71 provided downstream of the deodorizing device 70. That is, during the fermentation and decomposition treatment of the waste, the air inside the fermentation tank 10, i.e., the air (outside air) pressurized by the blower 30 into the fermentation tank 10, flows from the exhaust port 17 provided at the top of the fermentation tank 10 to the blocking section 50 provided outside the fermentation tank 10 together with the gas generated in the fermentation and decomposition treatment of the waste and the water vapor from the waste, and then flows into the deodorizing device 70 via the pipe 81. As the air passes through the deodorizing device 70, the odorous components are removed and the air is exhausted from the exhaust section 71 into the atmosphere.

[0066] Thus, in the airtight fermentation tank 10, the waste is fermented and decomposed by the action of microorganisms while being aerated and stirred, so that the waste is decomposed into water, carbon dioxide, and inorganic substances, and the moisture in the waste evaporates due to aeration and heating, reducing the volume and weight of the waste. The residue after the fermentation and decomposition process of the waste can be taken out from an outlet 43 provided on the side of the waste treatment device 1, and can be used, for example, as compost, a soil improver, feed for animals and livestock (for example, cows, pigs, horses, chickens, sheep, etc.), a deodorizer to be sprayed on livestock waste, a livestock waste promoter, etc.

[0067] In particular, in the waste treatment device 1 of this embodiment 1, outside air is blown into the fermentation tank 10 by the blower 30, and the outside air is blown onto the waste 10, thereby promoting the fermentation decomposition and drying of the waste 10. Even if dust scatters and rises from the waste 10 and is discharged together with the exhaust air from the exhaust port 17 formed at the top of the fermentation tank 10, a blocking section 50 is provided connected to the exhaust port 17 at the top of the fermentation tank 10, so that the collision body 53 and filter cloth 52 of the blocking section 50 prevent the dust (floating matter) of the waste 10 from passing through, and the dust contained in the exhaust air is returned to the fermentation tank 10 via the exhaust port 17.

[0068] That is, in this embodiment 1, the blocking section 50 is composed of a box-shaped lid 51 that covers the exhaust port 17 formed at the top of the fermenter 10 and forms a space of a predetermined volume, a bag-shaped filter cloth 52 whose opening side is attached freely detachably above the exhaust port 17 inside the box-shaped lid 51, and a collision body 53 contained within the bag of the bag-shaped filter cloth 52.In the blocking section 50, the upward exhaust flow from the exhaust port 17 of the fermenter 10 causes the collision body 53 to rise and fall within the bag of the bag-shaped filter cloth 52 attached to the exhaust port 17, so that dust contained in the exhaust air that rises from the exhaust port 17 and flows into the bag-shaped filter cloth 52 collides with the collision body 53 and falls. In addition, the upward exhaust flow from exhaust port 17 of fermenter 10 causes collision body 53 to rise and fall and move around within the bag of bag-shaped filter cloth 52 attached to exhaust port 17, causing collision body 53 to collide with the inner surface of bag-shaped filter cloth 52. The dust adhering to the inner surface of bag-shaped filter cloth 52 falls off due to contact of collision body 53 with the dust adhering to the inner surface of bag-shaped filter cloth 52 by collision body 53 or due to vibration caused when collision body 53 collides with the inner surface of bag-shaped filter cloth 52.

[0069] Furthermore, by attaching the bag-shaped filter cloth 52 to the exhaust ports 17 so as to cover the upper part of each exhaust port 17 with the bag-shaped filter cloth 52, in other words, by covering the upper part of the exhaust port 17 with the bag opening facing downwards, the dust that falls inside the bag-shaped filter cloth 52 is returned by falling into the fermentation tank 10 through the exhaust port 17. That is, in the waste treatment device 1 of the present embodiment 1, the blocking section 50 is provided on the vertically upper surface of the fermenter 10, and inside the box-shaped lid 51 provided on the top side of the fermenter 10 so as to surround and cover the upper parts of the multiple exhaust ports 17, a bag-shaped filter cloth 52 is placed with the opening side down to cover the upper parts of each exhaust port 17, so that dust that has fallen inside the bag-shaped filter cloth 52 falls by its own weight and is returned to the fermenter 10 through the exhaust port 17 to which the bag opening side is attached. The dust returned to the fermenter 10 is removed from the outlet 43 together with the waste in the fermenter 10 and collected.

[0070] Furthermore, since the bag-shaped filter cloth 52 is arranged with its opening facing down so as to cover the upper part of each exhaust port 17 of the fermenter 10, dust that is prevented from passing through by the bag-shaped filter cloth 52 tends to fall due to its own weight. In other words, since the inner surface of the end portion of the bag-shaped filter cloth 52 faces vertically downward, dust that reaches the inner surface of the bag-shaped filter cloth 52 tends to fall due to gravity, and the dust that has flowed into the bag-shaped filter cloth 52 can be made to fall and returned to the fermenter 10 through the exhaust port 17.

[0071] In addition, in this embodiment 1, a bag-shaped filter cloth 52 is attached to the exhaust port 17 in a manner that allows it to be easily attached and detached within a box-shaped lid 51 that covers the upper part of the exhaust port 17 in the blocking section 50, and a collision body 53 is contained within the bag-shaped filter cloth 52.Even if a filter cloth 52 for filtering dust is provided, the filter cloth 52 is formed in a bag shape and is flexible, and allows exhaust gas from the exhaust port 17 to pass from the inner side to the outer side of the filter cloth 52.Therefore, it is possible to remove dust adhering to the inner surface of the bag-shaped filter cloth 52 by the pressure of the exhaust flow from the exhaust port 17, the vibration of the strength and weakness of the exhaust flow pressure, and the expansion and contraction movement of the bag-shaped filter cloth 52 when the exhaust operation is stopped.

[0072] In this manner, the collision body 53 and the bag-shaped filter cloth 52 in the blocking section 50 prevent the passage of dust contained in the exhaust air from the fermenter 10. This makes it possible to prevent dust from flowing into the downstream deodorizing device 70, and to prevent a drop in deodorizing efficiency in a short period of time due to an increase in the load on the deodorizing device 70.

[0073] In the first embodiment, the collision body 53, which is accommodated in the bag of the bag-shaped filter cloth 52 attached above the exhaust port 17 and moves up and down inside the bag-shaped filter cloth 52 due to the exhaust air flow (air blown) from the fermenter 10, collides with the dust contained in the exhaust air, and the collision body 53 collides with the bag-shaped filter cloth 52, causing the dust suspended in the exhaust air that has flowed into the bag-shaped filter cloth 52 and the dust attached to the bag-shaped filter cloth 52 to fall. Furthermore, the bag-shaped filter cloth 52 is provided so as to cover each exhaust port 17 of the fermenter 10 with its opening facing downward, and has an inner surface facing vertically downward, so that the dust prevented from passing by the inner surface of the bag-shaped filter cloth 52 is likely to fall by its own weight, and therefore, it is possible to effectively prevent the dust from accumulating on the bag-shaped filter cloth 52 and causing clogging. Therefore, the maintenance for removing the dust collected in the filter cloth 52 is unnecessary or the burden of the maintenance can be reduced. In other words, the maintenance cost, work effort, and trouble can be reduced.

[0074] In particular, the exhaust air from the fermenter 10 contains a lot of moisture due to evaporation of water from the waste, and in the exhaust passage through which the exhaust air from the fermenter 10 communicates with the exhaust section 71, the moisture in the exhaust causes dust to adhere to the inner surface of the bag-shaped filter cloth 52. Before the dust can harden due to the moisture, the impact body 53 collides with the bag-shaped filter cloth 52, causing the dust to fall off, thereby preventing dust from accumulating and sticking to the inner surface of the bag-shaped filter cloth 52. In this manner, in the first embodiment, the action of the impactor 53 causes the dust to fall, thereby preventing the dust from accumulating and adhering to the filter cloth 52, so that condensation and rust are unlikely to occur inside the box-shaped lid 51 of the blocking unit 50. No condensation or wastewater is produced, making costly drainage equipment unnecessary.

[0075] Furthermore, since the filter cloth 52 is bag-shaped and allows air to pass from its inner side to its outer side while preventing dust from passing through on the inner side of the bag-shaped filter cloth 52, even if dust accumulates on the inside of the bag-shaped filter cloth 52, the dust accumulated on the inside of the bag-shaped filter cloth 52 can be discharged from the bag opening side and dropped back into the fermenter 10 from the exhaust port 17 by vibrating the bag-shaped filter cloth 52 from the outside while the bag-shaped filter cloth 52 is attached to the exhaust port 17. This makes it possible to ease the workload of maintaining the filter cloth 52.

[0076] Thus, according to the waste treatment device 1 of the present embodiment 1, the dust is unlikely to accumulate on the bag-shaped filter cloth 52, and the maintenance burden can be reduced. Furthermore, since the dust is unlikely to accumulate on the bag-shaped filter cloth 52, the load on the downstream deodorizing device 70 can be reduced.

[0077] As explained above, the waste treatment device 1 of the above-mentioned embodiment 1 comprises a fermentation tank 10 as a treatment tank for decomposing waste using microorganisms, an exhaust section 71 for releasing exhaust gas from the fermentation tank 10 into the atmosphere, and a blocking section 50 which is provided in an exhaust passage through which the exhaust gas from the fermentation tank 10 communicates with the exhaust section 71 and which uses an impactor 53 moving within a closed space 55 by the exhaust flow to drop dust contained in the exhaust gas from the fermentation tank 10 and prevent the dust from passing through.

[0078] According to the waste treatment device 1 of the first embodiment, the impactor 53, which is housed in the closed space 55 of a predetermined volume in the blocking section 50 and moves within the closed space 55 by the exhaust air flow from the fermenter 10, collides with dust suspended in the exhaust air from the fermenter 10, causing the dust to fall, and also collides with the inner surface forming the closed space 55 that houses the impactor 53, causing the dust adhering thereto to fall. Thus, it is possible to return the fallen dust to the fermenter 10 or to collect it at the point where it falls. Therefore, even if a filter (filter cloth 52) for filtering dust is provided in the blocking section 50, dust is difficult to collect in the filter (filter cloth 52), so the maintenance burden can be reduced.

[0079] That is, the waste treatment device 1 of the above-mentioned embodiment 1 comprises a fermentation tank 10 as a treatment tank for decomposing waste using microorganisms, an exhaust section 71 for releasing exhaust gas from the fermentation tank 10 into the atmosphere, and a blocking section 50 which is provided in an exhaust passage through which the exhaust gas from the fermentation tank 10 communicates with the exhaust section 71 and which forms a closed space 55 with a bag-shaped filter cloth 52 and which houses a collision body 53 moved by the exhaust flow from the fermentation tank 10, and which causes dust contained in the exhaust gas from the fermentation tank 10 to fall by the collision body 53 moved by the exhaust flow within the closed space 55 formed by the bag-shaped filter cloth 52, thereby preventing the passage of the dust.

[0080] According to the waste treatment device 1 of the first embodiment, the impactor 53, which is housed in the bag of the bag-shaped filter cloth 52 of the blocking section 50 and moves within the bag of the bag-shaped filter cloth 52 by the exhaust air flow from the fermenter 10, collides with dust suspended in the exhaust air from the fermenter 10, causing the dust to fall, and also collides with the inner surface of the bag-shaped filter cloth 52 housing the impactor 53, causing the dust adhering thereto to fall. In the first embodiment, the bag opening side of the bag-shaped filter cloth 52 is attached to the exhaust port 17 of the fermenter 10, so that the dust that has fallen within the bag of the bag-shaped filter cloth 52 falls back into the fermenter 10 via the exhaust port 17. Therefore, even if the filter cloth 52 is provided as a filter for filtering dust in the blocking section 50, dust is unlikely to accumulate on the filter cloth 52, so the burden of maintenance can be reduced. In addition, dust is unlikely to accumulate on the filter cloth 52, and clogging can be prevented, so that a burden is unlikely to be placed on the downstream deodorizing device 70. Therefore, running costs can be reduced.

[0081] According to the waste treatment device 1 of the first embodiment, the blocking section 50 covers the exhaust port 17 provided at the top of the fermenter 10, causing dust contained in the exhaust air to fall and return from the exhaust port 17 to the fermenter 10. That is, in the waste treatment device 1 of the first embodiment, the bag-shaped filter cloth 52 containing the impactor 53 is placed over the exhaust port 17 provided at the top of the fermenter 10 with its bag opening facing downward to cover the exhaust port 17, and the dust that has fallen inside the bag of the bag-shaped filter cloth 52 is returned from the exhaust port 17 to the fermenter 10. This eliminates the need for a separate configuration or collection operation for collecting the fallen dust at the point where it falls, making maintenance and management easier.

[0082] In particular, in the present embodiment 1, the bag-shaped filter cloth 52 has an opening facing vertically downward and covers the exhaust port 17 from above, so that the filter cloth 52 has an inner surface facing vertically downward, and dust that rises from the exhaust port 17 and is prevented from passing by the inner surface of the bag-shaped filter cloth 52 easily falls by its own weight, and the dust can be dropped and returned to the fermenter 10 from the exhaust port 17 with a simple configuration. That is, the bag-shaped filter cloth 52 is attached to the exhaust port 17 provided at the top of the fermenter 10 from above so that its opening faces vertically downward, and the bottom side of the filter cloth 52 faces downward, so that dust that reaches the inner surface of the filter cloth 52 easily falls by its own weight and gravity. And, by attaching the filter cloth 52 to the exhaust port 17 with the bag opening facing downward, the dust that falls inside the bag of the filter cloth 52 falls from the exhaust port 17 to the fermenter 10 and is returned. Therefore, dust can be effectively prevented from accumulating on the filter cloth 52.

[0083] Furthermore, according to the waste treatment device 1 of the above-mentioned embodiment 1, the blocking section 50 has the filter cloth 52 as a filtration filter that filters out dust, thereby increasing the dust removal efficiency and further reducing the load on the deodorizing device 70 provided downstream.

[0084] That is, according to the waste treatment device 1 of the above-mentioned embodiment 1, the blocking section 50 houses the collision body 53 in a bag-shaped filter cloth 52 that filters dust, and passes the exhaust gas from the fermentation tank 10 from the inner side to the outer side of the bag-shaped filter cloth 52. That is, the blocking section 50 has a bag-shaped filter cloth 52 that is attached to the exhaust port 17 of the fermentation tank 10 and filters dust, and the collision body 53 is housed in the bag of the bag-shaped filter cloth 52, and passes the exhaust gas from the fermentation tank 10 from the inner side to the outer side of the bag-shaped filter cloth 52. Therefore, the filter cloth 52 can increase the dust removal efficiency, and the load on the deodorization device 70 downstream can be further reduced.

[0085] In particular, in the waste treatment device 1 of the first embodiment, the bag-shaped filter cloth 52 is attached to cover the exhaust port 17 provided at the top of the fermenter 10 from above so that its opening faces vertically downward, so that the bottom side of the bag-shaped filter cloth 52 is located at the top and has an inner surface facing vertically downward, and therefore the dust prevented from passing by the inner surface of the filter cloth 52 is likely to fall by its own weight. In addition, the exhaust gas from the exhaust port 17 of the fermenter 10 is ventilated from the inner side to the outer side of the bag-shaped filter cloth 52, so that the exhaust gas flow from the exhaust port 17 is blown onto the inner surface of the bag-shaped filter cloth 52, and the pressure of the exhaust gas flow causes the dust to collide with the inner surface of the bag-shaped filter cloth 52 and to fall. Furthermore, the bag-shaped filter cloth 52 is flexible, so that the dust is likely to fall by expanding with the exhaust gas flow from the fermenter 10 and contracting when the exhaust gas stops. In addition, because the opening side of the bag-shaped filter cloth 52 communicates with the exhaust port 17, dust that has fallen inside the bag of the filter cloth 52 can be returned to the fermenter 10 through the exhaust port 17. This makes it difficult for dust to accumulate on the filter cloth 52, and dust that has flowed into the bag of the bag-shaped filter cloth 52 is discharged from the opening (bag mouth) side of the bag-shaped filter cloth 52, further reducing the burden of maintenance.

[0086] Furthermore, if the filter cloth 52 is bag-shaped, even if dust accumulates inside the bag of the filter cloth 52, the dust inside the filter cloth 52 can be easily discharged from the opening (bag mouth) side of the filter cloth 52 by vibrating the filter cloth 52. Therefore, even if dust accumulates inside the filter cloth 52, it can be easily removed, and therefore maintenance of the filter cloth 52 can be facilitated. That is, by vibrating the bag-shaped filter cloth 52 by hitting, pressing, shaking, pulling, etc. from the outside, the dust adhering to the inside of the bag-shaped filter cloth 52 can be shaken off, and the dust shaken off inside the bag of the bag-shaped filter cloth 52 can be discharged from the opening (bag mouth) side of the bag-shaped filter cloth 52 and dropped back into the fermenter 10 from the exhaust port 17. Therefore, even without removing the filter cloth 52 from the exhaust port 17, the dust accumulated on the filter cloth 52 can be shaken off and returned to the fermenter 10, and the workload for maintaining the filter cloth 52 can be eased.

[0087] Furthermore, according to the waste treatment device 1 of the first embodiment, the impactor 53 is a sphere, and therefore can easily move around within the space of the blocking section 50 even if the exhaust gas flow from the fermenter 10 is weak. This can increase the effect of causing the dust to fall. Furthermore, according to the waste treatment device 1 of the first embodiment, the impactor 53 is lightweight due to the gap space 53a, and has a structure that allows air to flow, so that even if the exhaust flow from the fermenter 10 is weak, the impactor 53 can easily move around within the space of the blocking section 50. This improves the effect of dropping the dust. In addition, the increased surface area can increase the contact rate and frequency with the dust exhausted from the exhaust port 17, improving the effect of the dust colliding with the impactor 53 and dropping the dust.

[0088] 1 to 5 of the first embodiment, the bag-shaped filter cloth 52 is formed in a substantially spherical shape with a gradually expanding diameter toward the top (bottom side, closed end side), but when the present invention is implemented, the shape is not limited to this shape, and may be a cylindrical shape, a square tube shape, a dome shape, or the like. For example, as shown in FIG. 6, the lower part of the bag mouth side may be a cylindrical shape with a substantially constant diameter that is substantially equal to the diameter of the exhaust port 17, and the upper closed end side may be formed in a spherical shape or an arc shape with a larger diameter than the lower part. This makes it easier for the impact body 53 to move around in the wide space on the upper side, and makes it possible to increase the effect of dropping dust by the impact body 53. In addition, in the first embodiment, the overall shape of the box-shaped lid 51 is substantially rectangular, but when the present invention is implemented, the shape is not limited to this shape, and may be formed in a dome shape, a columnar shape (cylindrical shape), a square tube shape, or the like. In the above embodiment 1, the exhaust port 57 is provided on the side surface of the bag-shaped lid 51. However, when implementing the present invention, the exhaust port 17 of the bag-shaped lid 51 may be provided on the top surface.

[0089] Here, in the waste treatment device 1 of the above-mentioned embodiment 1, in the blocking section 50, a bag-shaped filter cloth 52 is detachably attached to the exhaust port 17 of the fermentation tank 10, and the impact body 53 is housed in the closed space 55 formed by the bag-shaped filter cloth 52. However, when implementing the present invention, the filter is not limited to a bag-shaped one, and for example, a flat filter 52A may be used as the filter filter, as shown in Figure 7(a). That is, as a first variant of the first embodiment, as shown in FIG. 7(a), blocking section 50 may be constituted by a metal box-shaped lid 51 which collectively covers a plurality of exhaust ports 17 or covers each exhaust port 17, a flat filtration filter 52A provided on the side of exhaust port 57 formed upward within box-shaped lid 51, and a collision body 53 housed within box-shaped lid 51, and collision body 53 housed within box-shaped lid 51 is configured so that collision body 53 housed within closed space 55 formed between flat filtration filter 52A and exhaust port 17 within box-shaped lid 51 moves up and down within closed space 55 of box-shaped lid 51 due to the exhaust flow from fermenter 10.

[0090] In the first modification, a box-shaped lid 51 is formed on the upper surface of the fermenter 10 by placing a lid body having a shape of a rectangular parallelepiped, square tube, cylinder, or the like, which is open downward, on the upper surface of the fermenter 10 so as to surround and cover the exhaust port 17 formed on the upper part of the fermenter 10, and a predetermined closed space 55 is defined between the box-shaped lid 51, the exhaust port 17, and the filtration filter 52A. The box-shaped lid 51 can be opened by opening and closing the openable lid 51a, which has an upper part that can be sealed, and the openable lid 51a has an exhaust port 57 to which a pipe 81 connected to the deodorizing device 70 is connected. The inside of the box-shaped lid 51 is also designed to have an airtight structure that is isolated from the outside air, making it difficult for odors to leak out.

[0091] The flat filter 52A installed in a substantially horizontal direction at the top inside the box-shaped lid 51 has a mesh size that allows air to flow, i.e., ventilation, but prevents the passage of dust contained in the exhaust air, and is removably attached inside the box-shaped lid 51 above the exhaust port 17, i.e., on the exhaust port 57 side opposite the exhaust port 17. Therefore, the exhaust air that flows into the inside of the box-shaped lid 51 from the exhaust port 17 rises and passes from the lower side to the upper side of the flat filter 52A, i.e., from the inner side to the outer side, and is discharged from the exhaust port 57. Thus, the filter 52A also has an inner surface that faces vertically downward to prevent the passage of dust. The filtration filter 52A may be made of, for example, short fibers (spun yarns, spun yarns, etc.), long fibers (multifilament yarns, etc.), single fibers (monofilament yarns, etc.), splittable ultrafine fiber yarns, etc., made of synthetic fibers such as polypropylene, nylon, aromatic polyamide, vinylidene chloride, vinylon, cotton, or other natural fibers, and may be in the form of a lattice or mesh, or may be a filter cloth.

[0092] In blocking section 50 according to modified example 1, exhaust port 17 in which wire mesh 18 is installed is covered with box-shaped lid 51 having a bottomed cylindrical shape or the like, and flat filter 52A is installed inside box-shaped lid 51 above exhaust port 17, thereby forming closed space 55 between exhaust port 17 and flat filter 52A inside box-shaped lid 51, and a plurality of ball-shaped impactors 53 are accommodated in closed space 55. Note that, in modified example 1 as well, the upper part of box-shaped lid 51 can be freely opened by openable / closable lid 51a which can be sealed, so that the upper part of box-shaped lid 51 can be opened by openable / closable lid 51a, and flat filter 52A can be removed for cleaning or replacement.

[0093] In this manner, in the blocking section 50 according to the first modification, the exhaust port 17 is covered with the airtight box-shaped lid 51, so that the exhaust gas rising from the exhaust port 17 provided at the top of the fermenter 10 enters the closed space 55 below inside the box-shaped lid 51. A flat filter 52A is provided above the exhaust port 17 inside the box-shaped lid 51, and an exhaust port 57 is provided at the top of the box-shaped lid 51. A pipe 81 leading to the deodorizing device 70 is connected to the exhaust port 57. The exhaust gas from the exhaust port 17 rises in the closed space 55 inside the box-shaped lid 51, passes from the lower side to the upper side of the flat filter 52A, i.e., from the inner side to the outer side, and is discharged from the exhaust port 57 of the box-shaped lid 51 and is introduced into the deodorizing device 70 via the pipe 81.

[0094] In this case, in the blocking section 50 according to the first modification, a plurality of ball-shaped impacting bodies 53 are accommodated in a closed space 55 below the filter 52A provided inside the box-shaped lid 51 covering the exhaust port 17, so that the exhaust flow from the exhaust port 17 formed at the top of the fermenter 10 causes the plurality of ball-shaped impacting bodies 53 to rise and fall in the closed space 55 inside the box-shaped lid 51, moving and spreading randomly. As a result, dust suspended in the exhaust air flowing into the box-shaped lid 51 from the exhaust port 17 of the fermenter 10 collides with the impacting bodies 53 and falls. In addition, the impacting bodies 53 collide with and come into contact with the dust adhering to the inner surfaces of the box-shaped lid 51 and the inner surface (lower surface) of the filter 52A, causing the dust to fall. Furthermore, the vibrations generated when the impacting bodies 53 collide with the inner surfaces of the box-shaped lid 51 and the filter 52A also cause the dust adhering to the inner surfaces to fall. In the first variant, too, the box-shaped lid 51 is placed to cover the upper side of the exhaust port 17 provided at the top of the fermenter 10, and the lower side facing the exhaust port 17 is open. Therefore, when the collision body 53 collides with and comes into contact with the dust inside the box-shaped lid 51, or when the collision body 53 collides with the inner surface of the box-shaped lid 51 or the inner surface of the filtration filter 52A, the dust falls under its own weight from the exhaust port 17 and back into the fermenter 10.

[0095] Furthermore, in variant example 1, a box-shaped lid 51 is placed over the upper side of exhaust port 17 provided at the top of fermenter 10, and a flat filter 52A is placed inside the lid 51 above exhaust port 17. When the exhaust flow from exhaust port 17 is blown onto filter 52A, dust collides with the inner surface (lower surface) of filter 52A and falls, or the pressure of the exhaust flow can cause dust adhering to the inner surface of filter 52A to fall. In addition, a box-shaped lid 51 that forms a closed space 55 is installed so as to cover the upper side of the exhaust port 17 provided at the top of the fermenter 10, and a filtration filter 52A is provided inside the box-shaped lid 51 above the exhaust port 17 so that exhaust air passes from the bottom side to the top side, i.e., from the inner side to the outer side. Since the inner side of the filtration filter 52A provided above the exhaust port 17, which prevents dust from passing through, faces downward, dust that reaches the inner side of the filtration filter 52A falls by gravity and easily returns to the inside of the fermenter 10 through the exhaust port 17.

[0096] In this way, in the first modification, the blocking section 50 is composed of a metal box-shaped lid 51 covering the exhaust port 17, a flat plate-shaped filter 52A housed inside the box-shaped lid 51 and installed horizontally, and a collision body 53 housed in a closed space 55 formed inside the box-shaped lid 51 between the exhaust port 17 and the filter 52A. The collision body 53 housed inside the box-shaped lid 51 moves around inside the box-shaped lid 51 with the exhaust flow from the fermenter 10, and the collision body 53 moving in the closed space 55 inside the box-shaped lid 51 with the exhaust flow from the fermenter 10 collides with dust suspended in the exhaust from the fermenter 10, causing the dust to fall, and also collides with the inner surfaces of the box-shaped lid 51 and the filter 52A, causing the dust to fall even if it adheres to the inner surfaces of the box-shaped lid 51 and the filter 52A. The dust that falls inside the box-shaped lid 51 is returned to the fermenter 10 through the exhaust port 17 below.

[0097] That is, the waste treatment device 1 of the first modified example comprises a fermentation tank 10 as a treatment tank for decomposing waste using microorganisms, an exhaust section 71 for releasing exhaust gas from the fermentation tank 10 into the atmosphere, and a blocking section 50 which is provided in an exhaust passage through which the exhaust gas from the fermentation tank 10 communicates with the exhaust section 71 and which forms a closed space 55 with a box-shaped lid 51 for accommodating an impactor 53 moved by the exhaust flow from the fermentation tank 10, and which causes dust contained in the exhaust gas from the fermentation tank 10 to fall using the impactor 53 which moves within the closed space 55 of the box-shaped lid 51 due to the exhaust flow, thereby preventing the passage of the dust.

[0098] According to the waste treatment device 1 of the first modification, the collision body 53, which is accommodated in the closed space 55 inside the box-shaped lid 51 of the blocking section 50 and moves in the closed space 55 inside the box-shaped lid 51 by the exhaust air flow from the fermenter 10, collides with dust suspended in the exhaust air from the fermenter 10, causing the dust to fall, and also collides with the inner surface of the box-shaped lid 51 and the filter 52A that accommodates the collision body 53, causing the dust adhering thereto to fall. Furthermore, dust contained in the exhaust air from the exhaust port 17 also collides with the inner surface of the box-shaped lid 51 and the filter 52A, causing the dust to fall. In addition, in the first modification, the box-shaped lid 51 covers the upper side of the exhaust port 17 of the fermenter 10, and the flat filter 52A is installed at a position above the exhaust port 17 inside the box-shaped lid 51, so that the filter 52A has an inner surface that faces vertically downward, and the dust that is prevented from passing by the inner surface of the filter 52A is likely to fall by gravity. The dust that falls inside the box-shaped lid 51 is returned to the fermenter 10 via the exhaust port 17. Therefore, since dust is not collected in the filter, the maintenance burden can be reduced.

[0099] In the first modification, the blocking section 50 also covers the exhaust port 17 provided at the top of the fermenter 10, causing dust contained in the exhaust air to fall and be returned from the exhaust port 17 to the fermenter 10. That is, the box-shaped lid 51 covers the upper part of the exhaust port 17 provided at the top of the fermenter 10, and returns the dust that has fallen inside the fermenter 10 to the fermenter 10 from the exhaust port 17. This eliminates the need for a separate configuration or recovery operation for collecting the fallen dust at the point where it falls, making maintenance and management easier. In addition, the lower side of the box-shaped lid 51 is open to cover the exhaust port 17 from above, and a flat filter 52A is installed inside the box-shaped lid 51 at a position above the exhaust port 17, so that dust that rises from the exhaust port 17 and reaches the inner surface of the filter 52A can be easily dropped by its own weight, and the dust can be dropped with a simple configuration and returned from the exhaust port 17 to the fermenter 10. That is, the box-shaped lid 51 is installed so as to cover the exhaust port 17 provided at the top of the fermenter 10 from above, and a flat filter 52A is installed inside the box-shaped lid 51 at a position above the exhaust port 17, so that air passes from the inner surface side (lower surface side) of the filter 52A to the outer surface side (upper surface side), and the inner surface side of the filter 52A faces downward, so that dust that is prevented from passing by the inner surface of the filter 52A can be easily dropped by gravity, and the dust that has flowed into the inside of the box-shaped lid 51 can be returned from the exhaust port 17 to the fermenter 10. Therefore, the passage of dust can be effectively prevented. In addition, since the blocking portion 50 is provided on the upper surface of the fermentation tank 10, it does not take up much installation space in terms of width.

[0100] When exhaust gas passes from the inner surface side to the outer surface side of filtration filter 52A, the inner surface side corresponds to the intake air side, and the outer surface side corresponds to the exhaust air side. In the above-mentioned modified example 1, the filter 52A is provided on the exhaust port 57 side of the blocking section 50, and the filter 52A is, for example, a flat filter made of mesh-like fibers or the like. However, when the present invention is implemented, the filter is not limited to a flat filter shape, and may be a cylindrical or bag-like filter. Even if the filter 52A is provided on the exhaust port 57 side in this manner, the collision body 53 accommodated in the box-shaped lid 51 moves around in the closed space 55 of the box-shaped lid 51 with the exhaust flow from the fermenter 10, and collides with dust suspended in the exhaust from the fermenter 10, the inner surface of the box-shaped lid 51, and the surface of the filter 52A, causing the dust to fall. Therefore, dust is unlikely to accumulate on the filter 52A, and the frequency and load of maintenance can be reduced even if the filter 52A is provided.

[0101] In the above-mentioned embodiment 1 and variant example 1, the filter 52, 52A is provided in the blocking section 50 to increase the dust removal rate and reduce the load on the deodorizing device 70. However, when implementing the present invention, if there is little dust rising from the fermentation tank 10, it is also possible to omit the bag-shaped filter cloth 52 or the flat filter 52A. That is, as a second variant of the first embodiment, as shown in FIG. 7(b), the blocking section 50 may be constituted by a metal box-shaped lid 51 covering each exhaust port 17 and a collision body 53 housed in the box-shaped lid 51, and the collision body 53 housed in the box-shaped lid 51 may be made to move up and down within the closed space 55 of the box-shaped lid 51 by the exhaust flow from the fermenter 10.

[0102] In the second modification, a lid body with an open bottom is placed on the top of the fermenter 10 so as to surround and cover each exhaust port 17 formed on the top of the fermenter 10, thereby forming a box-shaped lid 51 on the top of the fermenter 10, and a predetermined closed space 55 is defined by the box-shaped lid 51. The box-shaped lid 51 can also be opened and closed by opening and closing the openable lid 51a, which can be sealed at the top. As in the first embodiment, the side of the lid 51 has an exhaust port 57 connected to a pipe 81 connected to the deodorizing device 70 (omitted in FIG. 7(b)). The inside of the box-shaped lid 51 is also designed to be airtight, blocking the outside air, to prevent odors from leaking out. The box-shaped lid 51 in the second modification can be formed, for example, as an elongated sphere as shown in FIG. 7(b), which allows a wide contact surface with the impact body 53 and prevents the accumulation of dust. However, when implementing the present invention, the shape is not limited to this, and the lid can also be formed, for example, into a dome shape, a cylinder shape, a square tube shape, a rectangular prism shape, etc.

[0103] In the blocking section 50 relating to variant example 2, the exhaust port 17 in which the wire mesh 18 is installed is covered with a metal box-shaped lid 51, thereby forming a closed space 55 within the box-shaped lid 51, and a plurality of ball-shaped collision bodies 53 are housed in the closed space 55. In addition, in the second modified example, the upper part of the box-shaped lid 51 can be freely opened by the open-close lid 51a which can be freely sealed, so that the upper part of the box-shaped lid 51 can be opened by the open-close lid 51a, and it is also possible to clean the inside or replace the impact body 53.

[0104] Thus, in the blocking section 50 according to the second modification, the exhaust port 17 is covered with the airtight box-shaped lid 51, so that the exhaust air rising from the exhaust port 17 provided at the top of the fermenter 10 enters the closed space 55 inside the box-shaped lid 51. The box-shaped lid 51 has an exhaust port 57 provided on its side, and a pipe 81 leading to the deodorizing device 70 is connected to the exhaust port 57. Therefore, the exhaust air that has flowed into the closed space 55 inside the box-shaped lid 51 is discharged from the exhaust port 57 of the box-shaped lid 51 and introduced into the deodorizing device 70 via the pipe 81.

[0105] In this case, in the blocking section 50 according to the second modification, a plurality of ball-shaped impacting bodies 53 are accommodated in the closed space 55 inside the box-shaped lid 51 covering each exhaust port 17, so that the exhaust flow from the exhaust port 17 formed at the top of the fermenter 10 causes the plurality of ball-shaped impacting bodies 53 to rise and fall, moving and dispersing randomly in the closed space 55 inside the box-shaped lid 51. As a result, dust suspended in the exhaust air flowing into the inside of the box-shaped lid 51 from the exhaust port 17 of the fermenter 10 collides with the impacting bodies 53 and falls. In addition, the impacting bodies 53 collide with and come into contact with the dust adhering thereto, causing the dust to fall. Furthermore, the vibrations generated when the impacting bodies 53 collide with the inner side of the box-shaped lid 51 also cause the dust adhering thereto to fall. In the second variant, too, a box-shaped lid 51 is placed to cover the upper side of the exhaust port 17 provided at the top of the fermenter 10, and the lower side facing the exhaust port 17 is open. Therefore, when the collision body 53 collides with and comes into contact with the dust inside the box-shaped lid 51, and when the collision body 53 collides with the box-shaped lid 51, the dust falls, and the dust falls under its own weight from the exhaust port 17 back into the fermenter 10.

[0106] Furthermore, in variant example 2, a box-shaped lid 51 is placed to cover the upper side of each exhaust port 17 provided at the top of the fermenter 10, and the exhaust flow from the exhaust port 17 is blown onto the box-shaped lid 51, causing dust to collide with the inner surface of the box-shaped lid 51 and fall, or the pressure of the exhaust flow can cause dust adhering to the inner surface of the box-shaped lid 51 to fall. In addition, the box-shaped lid 51 that forms the closed space 55 is installed so as to cover the upper side of the exhaust port 17 provided at the top of the fermenter 10. As the box-shaped lid 51 has an inner surface that faces downward, dust that collides with the inner surface of the box-shaped lid 51 falls by gravity and easily returns to the inside of the fermenter 10 through the exhaust port 17.

[0107] In this way, in the second modification, the blocking section 50 is composed of the metallic box-shaped lid 51 covering the exhaust port 17 and the collision body 53 housed inside the box-shaped lid 51, and the collision body 53 housed inside the box-shaped lid 51 moves around inside the box-shaped lid 51 with the exhaust airflow from the fermenter 10, so that the collision body 53 moving in the sealed space 55 inside the box-shaped lid 51 with the exhaust airflow from the fermenter 10 collides with dust suspended in the exhaust air from the fermenter 10, causing the dust to fall, and also causes the dust to fall even if it is attached to the inner surface of the box-shaped lid 51, by colliding with the inner surface of the box-shaped lid 51. The dust that has fallen inside the box-shaped lid 51 is returned to the fermenter 10 via the exhaust port 17 below.

[0108] That is, the waste treatment device 1 of the modified example 2 comprises a fermentation tank 10 as a treatment tank for decomposing waste using microorganisms, an exhaust section 71 for releasing exhaust gas from the fermentation tank 10 into the atmosphere, and a blocking section 50 which is provided in an exhaust passage through which the exhaust gas from the fermentation tank 10 communicates with the exhaust section 71 and which forms a closed space 55 with a box-shaped lid 51 for accommodating an impactor 53 moved by the exhaust flow from the fermentation tank 10, and which causes dust contained in the exhaust gas from the fermentation tank 10 to fall using the impactor 53 which moves within the closed space 55 of the box-shaped lid 51 due to the exhaust flow, thereby preventing the passage of the dust.

[0109] According to the waste treatment device 1 of the second modification, the impactor 53, which is housed in the closed space 55 inside the box-shaped lid 51 of the blocking section 50 and moves in the closed space 55 inside the box-shaped lid 51 by the exhaust air flow from the fermenter 10, collides with dust suspended in the exhaust air from the fermenter 10, causing the dust to fall, and also collides with the inner surface of the box-shaped lid 51 housing the impactor 53, causing the dust adhering thereto to fall. Furthermore, dust contained in the exhaust air from the exhaust port 17 also falls when it collides with the box-shaped lid 51. Also in the second modification, the box-shaped lid 51 covers the upper part of the exhaust port 17 of the fermenter 10, so that dust that falls inside the box-shaped lid 51 falls back into the fermenter 10 through the exhaust port 17. Therefore, since dust is not collected in the filter, the maintenance burden can be reduced.

[0110] In the second modification, the blocking section 50 also covers the exhaust port 17 provided at the top of the fermenter 10, causing dust contained in the exhaust air to fall and be returned from the exhaust port 17 to the fermenter 10. That is, the box-shaped lid 51 covers the upper part of the exhaust port 17 provided at the top of the fermenter 10, and returns the dust that has fallen inside the fermenter 10 to the fermenter 10 from the exhaust port 17. This eliminates the need for a separate configuration or recovery operation for collecting the fallen dust at the point where it falls, making maintenance and management easier. In addition, by covering the exhaust port 17 from above with the box-shaped lid 51, dust that rises from the exhaust port 17 and collides with the inner surface of the box-shaped lid 51 easily falls by its own weight, and the fallen dust can be returned to the fermenter 10 from the exhaust port 17 with a simple configuration. That is, by providing the box-shaped lid 51 to cover the exhaust port 17 provided at the top of the fermenter 10 from above, the box-shaped lid 51 has a downward inner surface, and dust that collides therewith falls by gravity and is returned to the fermenter 10 from the exhaust port 17. Thus, the passage of dust can be effectively prevented. In addition, since the blocking portion 50 is provided on the upper surface portion, which is above the fermenter 10, it does not take up a lateral installation space.

[0111] Furthermore, in the waste treatment device 1 of the above-mentioned embodiment 1 and modifications 1 and 2, the blocking section 50 is provided on the upper surface of the fermentation tank 10, and the bottom side (closed end side) of the opposite opening side of the bag-shaped filter cloth 52, the inner side (lower side) of the flat filter filter 52A, and the upper surface side of the box-shaped lid 51 are located above the exhaust port 17 provided on the upper surface of the fermentation tank 10. This allows the exhaust air from the fermentation tank 10 to rise from the exhaust port 17, and the dust that reaches these drops by gravity and enters the fermentation tank 10 through the exhaust port 17. However, when implementing the present invention, an exhaust port 17 may be formed at the upper part of the side surface of the fermenter 10, a blocking section 50 may be provided at the upper part of the side surface of the fermenter 10, a box-shaped lid 51 or a bag-shaped filter cloth 52 may open at a direction approximately perpendicular to the vertical direction to cover the exhaust port 17, and dust may be dropped by an impact body 53 contained in a closed space 55 formed by the box-shaped lid 51 or the bag-shaped filter cloth 52 to fall downward in a direction approximately perpendicular to the up-down direction and returned to the fermenter 10 via the exhaust port 17.

[0112] That is, as a third variant of the first embodiment, as shown in FIG. 8, an exhaust port 17 is provided on the upper side of the side wall of the fermentation tank 10, and a box-shaped lid 51 for covering the exhaust port 17 is provided on the upper side of the side surface of the fermentation tank 10. Inside the box-shaped lid 51, a bag-shaped filter cloth 52 is attached to the exhaust port 17 of the fermentation tank 10 in a freely detachable manner, and further, an impact body 53 is housed within the bag-shaped filter cloth 52.

[0113] In this modification 3, an exhaust port 17 is formed above one side of the fermenter 10, a box-shaped lid 51 covering the exhaust port 17 is provided above one side of the fermenter 10, and an exhaust port 57 is formed at the top of the box-shaped lid 51. Thus, the exhaust air in the fermenter 10 is discharged from the side of the fermenter 10 through the exhaust port 17, flows into the blocking section 50 provided on the side of the fermenter 10, passes from the inner side to the outer side of the bag-shaped filter cloth 52 of the blocking section 50, and rises toward the exhaust port 57 at the top of the blocking section 50. At this time, the exhaust air from the exhaust port 17 moves the collision body 53 around within the bag of the bag-shaped filter cloth 52, and the collision of the collision body 53 with the dust or the collision vibration with the bag-shaped filter cloth 52 causes the dust floating within the bag of the bag-shaped filter cloth 52 and the dust attached to the inner surface of the bag-shaped filter cloth 52 to fall. In addition, when the exhaust air flow from the exhaust port 17 is blown against the inner surface of the bag-shaped filter cloth 52, the pressure of the exhaust air flow causes dust to collide with the inner surface of the bag-shaped filter cloth 52 and drop. Furthermore, because of the flexibility of the bag-shaped filter cloth 52, the dust adhering to the inner surface of the filter cloth 52 also drops when the bag-shaped filter cloth 52 expands due to the exhaust air flow from the fermenter 10 and contracts when the exhaust air stops. Furthermore, even if dust adheres to the downward-facing inner surface of the bag-shaped filter cloth 52, it tends to drop downward due to its own weight.

[0114] 8, the bag-shaped filter cloth 52 has a curved or arcuate shape, but has a shape that is inclined downward even in a contracted state when ventilation is stopped and no exhaust is being performed from the exhaust port 17, that is, has an inclined portion 58 that is inclined downward toward the exhaust port 17 at the lower portion. Therefore, dust that has fallen inside the bag-shaped filter cloth 52 falls along the inclined surface of the lower inclined portion 58 toward the exhaust port 17 of the fermenter 10, and can be returned to the fermenter 10 from the exhaust port 17.

[0115] Therefore, in the waste treatment device 1 according to the third modification, dust is also less likely to accumulate on the bag-shaped filter cloth 52, and the maintenance load can be reduced. In the waste treatment device 1 according to the third modification, the blocking section 50 also covers the exhaust port 17 provided on the upper side of the fermenter 10, and causes dust contained in the exhaust air to fall and be returned from the exhaust port 17 to the fermenter 10. That is, the bag-shaped filter cloth 52 containing the impactor 53 is placed over the exhaust port 17 provided on the upper side of the side of the fermenter 10 with its bag opening side facing sideways to cover the exhaust port 17, and a sloping section 58 is formed on the lower side of the bag-shaped filter cloth 52 such that the dust that has fallen inside the bag of the bag-shaped filter cloth 52 falls toward the exhaust port 17 by the sloping section 58 and is returned from the exhaust port 17 to the fermenter 10. This eliminates the need for a separate configuration or operation for collecting the fallen dust at the point where it falls, and facilitates maintenance and management. Furthermore, the bag-shaped filter cloth 52 containing the collision body 53 is placed over the exhaust port 17 provided on the upper side of the side of the fermenter 10 with its bag opening facing sideways to cover the exhaust port 17, and the bag-shaped filter cloth 52 has an inner surface facing vertically downward, so that dust that rises inside the bag of the bag-shaped filter cloth 52 and is prevented from passing by the inner surface facing vertically downward of the bag-shaped filter cloth 52 easily falls by its own weight. The dust that falls inside the bag of the bag-shaped filter cloth 52 falls toward the exhaust port 17 at the inclined portion 58 and is returned to the fermenter 10 from the exhaust port 17. Therefore, dust is less likely to accumulate in the bag-shaped filter cloth 52. In addition, in the third modification, since the blocking section 50 is provided on the lateral side of the fermenter 10, it does not take up any vertical installation space.

[0116] Also in the third modification, if the filter cloth 52 is bag-shaped, even if dust accumulates inside the bag of the filter cloth 52, the dust inside the filter cloth 52 can be easily discharged from the opening (bag mouth) side of the filter cloth 52 by vibrating the filter cloth 52. Therefore, even if dust accumulates inside the filter cloth 52, it can be easily removed, and therefore maintenance of the filter cloth 52 can be facilitated. In the box-shaped lid 51 according to the third modification, the side surface opposite to the exhaust port 17 side of the fermenter 10 can be freely opened by a sealable openable lid 51a, and the side surface of the box-shaped lid 51 can be opened by the openable lid 51a, and the dust adhering to the inside of the bag-shaped filter cloth 52 can be shaken off by inserting a hand into the box-shaped lid 51 and striking, pressing, shaking, or pulling the bag-shaped filter cloth 52 provided inside the box-shaped lid 51 from the outside to apply vibration, and the dust shaken off within the bag of the bag-shaped filter cloth 52 can be discharged from the opening (bag mouth) side of the filter cloth 52 and dropped back into the fermenter 10 from the exhaust port 17. Therefore, even without removing the filter cloth 52 from the exhaust port 17, the dust accumulated on the filter cloth 52 can be shaken off and returned to the fermenter 10, and the workload of maintaining the filter cloth 52 can be eased.

[0117] In addition, in the third modification, the exhaust port 57 is provided on the upper surface of the bag-shaped lid 51, but in carrying out the present invention, the exhaust port 17 of the bag-shaped lid 51 may be provided on the side surface or the lower surface. Even when the blocking section 50 is provided on the upper portion of the side surface of the fermenter 10 as in the third modification, a filter 52A may be attached to the exhaust port 57 side of the blocking section 50 as in the first modification, instead of the bag-shaped filter cloth 52 attached to the exhaust port 17.

[0118] Furthermore, in the third variant, a bag-shaped filter cloth 52 is detachably attached to the exhaust port 17 of the fermenter 10 to increase the dust removal rate and reduce the load on the deodorizing device 70, but if there is little dust rising from the fermenter 10, the filter cloth 52 can be omitted. That is, as a fourth modification of the first embodiment, the blocking section 50 may be constituted by a metal box-shaped lid 51 covering the exhaust port 17 and a collision body 53 housed in the box-shaped lid 51, and the collision body 53 housed inside the box-shaped lid 51 may be moved up and down within the closed space 55 of the box-shaped lid 51 by the exhaust flow from the fermenter 10. As the fourth modification, as shown in Fig. 9, the exhaust port 17 is provided above one side of the fermenter 10, and the box-shaped lid 51 covering this exhaust port 17 is provided above one side surface of the fermenter 10, and the collision body 53 is housed inside the box-shaped lid 51.

[0119] In the fourth modification, a lid body with a side opening is placed on the side of the fermenter 10 so as to surround and cover each exhaust port 17 formed on the upper part of the side of the fermenter 10, thereby forming a box-shaped lid 51 on the side of the fermenter 10, defining a predetermined closed space 55, the side of which can be opened by opening and closing the openable lid 51a which can be sealed. Also, on the upper surface side, there is an exhaust port 57 connected to a pipe 81 which is connected to the deodorizing device 70. In the blocking section 50 relating to variant example 4, the exhaust port 17 in which the wire mesh 18 is installed is covered with a metal box-shaped lid 51, thereby forming a closed space 55 within the box-shaped lid 51, and a plurality of ball-shaped collision bodies 53 are housed in the closed space 55.

[0120] Therefore, the exhaust air from the exhaust port 17 of the fermenter 10 is discharged from the side of the fermenter 10, flows into the blocking section 50 provided on the side of the fermenter 10, and rises toward the exhaust port 57 provided on the upper surface of the blocking section 50. At this time, the exhaust air flow from the exhaust port 17 moves the collision body 53 around in the closed space 55 of the box-shaped lid 51, and the collision of the collision body 53 with the dust and the collision vibration with the inner surface of the box-shaped lid 51 cause the dust floating inside the box-shaped lid 51 and the dust attached to the inner surface of the box-shaped lid 51 to fall. In addition, the exhaust air flow from the exhaust port 17 is blown against the inner surface of the box-shaped lid 51, and the pressure of the exhaust air flow also causes the dust to collide with the inner surface of the box-shaped lid 51 and fall. Furthermore, even if dust adheres to the downward-facing inner surface of the box-shaped lid 51, it is likely to fall downward due to its own weight.

[0121] Here, the box-shaped lid 51 according to the fourth modification can be formed in a dome-like, cylindrical, rectangular parallelepiped or other shape, but preferably has a curved shape at the top and an inclined portion 58 inclined downward toward the exhaust port 17 at the bottom inside, as shown in Fig. 9. As a result, dust that has fallen inside the box-shaped lid 51 falls along the inclined surface of the lower inclined portion 58 toward the exhaust port 17 of the fermenter 10, and is returned to the fermenter 10 from the exhaust port 17. In addition, since the upper part of the box-shaped lid 51 has a curved surface, a wide contact surface with the impactor 53 can be secured, and accumulation of dust can be prevented. Therefore, since dust is not collected in the filter, the maintenance burden can be reduced.

[0122] In the waste treatment device 1 according to the fourth modification, the blocking section 50 is also constituted by a metal box-shaped lid 51 covering the exhaust port 17 and a collision body 53 housed in the box-shaped lid 51, and the collision body 53 housed in the box-shaped lid 51 moves around in the closed space 55 formed by the box-shaped lid 51 due to the exhaust air flow from the fermenter 10, so that the collision body 53 moving in the closed space 55 inside the box-shaped lid 51 due to the exhaust air flow from the fermenter 10 collides with dust floating in the exhaust air from the fermenter 10 and the inner wall surface of the box-shaped lid 51, causing the dust floating in the exhaust air from the fermenter 10 to fall, and also causing the dust to fall even if it is attached to the inner surface of the box-shaped lid 51. The dust that has fallen inside the box-shaped lid 51 falls along the inclined surface of the lower inclined portion 58 toward the exhaust port 17, and is returned to the fermenter 10 via the exhaust port 17.

[0123] In the waste treatment device 1 according to the fourth modification, the blocking unit 50 covers the exhaust port 17 provided at the upper part of the side part of the fermenter 10, and drops the dust contained in the exhaust air and returns it to the fermenter 10 through the exhaust port 17. That is, the opening side of the box-shaped lid 51 containing the impactor 53 is turned sideways to cover the exhaust port 17 provided at the upper part of the side part of the fermenter 10, and a sloping part 58 that slopes downward toward the exhaust port 17 is formed below the box-shaped lid 51, so that the dust that has fallen inside the box-shaped lid 51 falls toward the exhaust port 17 through the sloping part 58 and returns it to the fermenter 10 through the exhaust port 17. This eliminates the need for a separate configuration or recovery work for collecting the fallen dust at the point where it falls, and facilitates maintenance and management. In particular, since the blocking unit 50 is provided on the side part of the fermenter 10, it does not take up a vertical installation space.

[0124] In the waste treatment device 1 of the above-mentioned embodiment 1 and variants 1 to 4, the collision body 53 is contained in the closed space 55 of a predetermined volume of the blocking section 50 and moves within the closed space 55 by the exhaust flow from the fermenter 10, and collides with dust floating in the exhaust from the fermenter 10, causing the dust to fall, and also collides with the inner surface that forms the closed space 55 of a predetermined volume that contains the collision body 53, causing the dust adhering thereto to fall, and the fallen dust is returned to the fermenter 10 from the exhaust port 17, which is a simple configuration. However, when implementing the present invention, the dust may be collected at the point where it falls. That is, in the above-mentioned embodiment 1 and variants 1 to 4, the box-shaped lid 51 or bag-shaped filter cloth 52 of the blocking section 50 is configured to cover the exhaust port 17, causing dust to fall into the closed space 55 formed by the box-shaped lid 51 or the closed space 55 formed by the bag-shaped filter cloth 52, and the dust returns to the fermenter 10 through the exhaust port 17. However, when implementing the present invention, for example, a blocking section 50 may be provided at the end of a pipe attached to the exhaust port 17, and the dust that falls there may be discharged from an outlet separate from the exhaust port 17.

[0125] [Embodiment 2] Next, a waste treatment device 1 according to a second embodiment of the present invention will be described with reference to Figures 10 and 11. As with the first embodiment, the second embodiment of the present invention also illustrates the case where the waste treatment device of the present invention is applied to a bio-composter. The waste treatment device 1 of this embodiment 2 comprises a fermentation tank 10 as a treatment tank for decomposing waste using microorganisms, an exhaust section 71 for releasing exhaust gas from the fermentation tank 10 into the atmosphere, and a blocking section 50 which is provided in an exhaust passage connecting the exhaust gas from the fermentation tank 10 to the exhaust section 71 and which is attached to the exhaust port 17 of the fermentation tank 10 and which prevents the passage of dust contained in the exhaust gas from the fermentation tank 10 by using a bag-shaped filter cloth 52 which allows the exhaust gas from the fermentation tank 10 to pass from the inner side to the outer side.

[0126] In the above-mentioned embodiment 1 and variants 1 to 4, a collision body 53 is housed in a closed space 55 formed by the box-shaped lid 51 and bag-shaped filter cloth 52 of the blocking section 50, and the exhaust flow from the exhaust port 17 causes the collision body 53 to move within the closed space 55, causing dust to fall and preventing the dust from passing through. This reduces the maintenance burden by preventing dust from accumulating on the inner surface of the box-shaped lid 51 and the inner surface of the bag-shaped filter cloth 52 that constitute the blocking section 50. In contrast to this, in the present embodiment 2, the passage of dust in the exhaust gas from the fermenter 10 is prevented by only a bag-shaped filter cloth 52 that passes the exhaust gas from the fermenter 10 from the inner side to the outer side. Since the configuration is the same as that of the above-mentioned embodiment 1 except that the impact body 53 is not housed inside the bag of the bag-shaped filter cloth 52, a duplicated description will be omitted here and only the different parts will be described.

[0127] As shown in Figure 10, in this embodiment 2, a blocking section 50 is formed by a metal box-shaped lid 51 covering the exhaust port 17 of the fermenter 10 and a bag-shaped filter cloth 52 housed inside the box-shaped lid 51 and attached removably to the exhaust port 17. The blocking section 50 allows the exhaust gas from the exhaust port 17 of the fermenter 10 to pass from inside the bag of the bag-shaped filter cloth 52 to outside, but prevents dust contained in the exhaust gas from passing from its inner side to its outer side.

[0128] In this embodiment 2, a bag-shaped filter cloth 52 is placed to cover the upper side of the exhaust port 17 provided on the upper surface of the fermenter 10, and the bag-shaped filter cloth 52 opens toward the exhaust port 17 on the vertically downward side, so that dust in the exhaust air that flows into the bag of the bag-shaped filter cloth 52 is prevented from passing from the inner side to the outer side of the filter cloth 52. In particular, since the bag-shaped filter cloth 52 has an inner surface facing vertically downward, dust that has been pressed against the vertically downward inner side of the bag-shaped filter cloth 52 by the exhaust air flow tends to fall under its own weight when the exhaust gas is stopped, and the dust that has flowed into the bag of the bag-shaped filter cloth 52 can be returned to the fermenter 10 from the exhaust port 17.

[0129] That is, the bag-shaped filter cloth 52 is attached to cover the exhaust port 17 provided on the upper surface of the fermenter 10 from above so that its opening faces vertically downward, so that even if dust adheres to the downward-facing inner surface of the filter cloth 52, it easily falls by gravity. Also, the exhaust air from the exhaust port 17 of the fermenter 10 flows in through the downward-facing opening of the bag-shaped filter cloth 52, rises, and passes from the inner side to the outer side of the bag-shaped filter cloth 52, so that the exhaust air flow from the exhaust port 17 is blown onto the inner surface of the bag-shaped filter cloth 52, and the pressure of the exhaust air flow causes the dust contained in the exhaust air to collide with the inner surface of the bag-shaped filter cloth 52 and easily fall. In addition, the bag-shaped filter cloth 52 is flexible, so that the dust adhered to the inner surface of the bag-shaped filter cloth 52 easily falls due to the movement of expanding with the exhaust air flow from the fermenter 10 and contracting when the exhaust air stops. The filter cloth 52 is attached to the exhaust port 17 with the bag opening side facing downwards, so that dust that falls inside the filter cloth 52 falls back into the fermentation tank 10 through the exhaust port 17. This prevents dust from accumulating on the filter cloth 52, thereby reducing the workload for maintaining the filter cloth 52.

[0130] That is, in the waste treatment device 1 of the second embodiment, the bag-shaped filter cloth 52 is attached to cover the exhaust port 17 provided on the upper surface of the fermenter 10 from above so that the opening faces vertically downward, and the bottom side of the bag-shaped filter cloth 52 is located at the top and has an inner surface facing vertically downward, so that dust that is prevented from passing through by the inner surface of the filter cloth 52 easily falls by its own weight. Also, since the exhaust gas from the exhaust port 17 of the fermenter 10 passes from the inner side to the outer side of the bag-shaped filter cloth 52, the exhaust gas flow from the exhaust port 17 is blown onto the inner side of the bag-shaped filter cloth 52, and the pressure of the exhaust gas flow causes the dust to collide with the inner surface of the bag-shaped filter cloth 52 and to fall. Also, if the filter cloth 52 is bag-shaped, the dust easily falls due to its flexibility, as it expands with the exhaust gas flow from the fermenter 10 and contracts when the exhaust gas stops. In addition, because the opening side of the bag-shaped filter cloth 52 communicates with the exhaust port 17, dust that has fallen inside the bag of the filter cloth 52 can be returned to the fermenter 10 from the exhaust port 17. This makes it difficult for dust to accumulate on the filter cloth 52, and dust that has flowed into the bag-shaped filter cloth 52 is discharged from the opening (bag mouth) side of the bag-shaped filter cloth, further reducing the burden of maintenance.

[0131] Furthermore, if the filter cloth 52 is bag-shaped, even if dust accumulates inside the bag of the filter cloth 52, the dust inside the filter cloth 52 can be easily discharged from the opening (bag mouth) side of the filter cloth 52 by vibrating the filter cloth 52. Therefore, even if dust accumulates inside the filter cloth 52, it can be easily removed, and therefore maintenance of the filter cloth 52 can be facilitated. 11, dust adhering to the inside of the bag-shaped filter cloth 52 can be shaken off by vibrating the bag-shaped filter cloth 52 by hitting, pressing, shaking, pulling, etc. from the outside, and the dust shaken off inside the bag of the bag-shaped filter cloth 52 can be discharged from the opening (bag mouth) side of the filter cloth 52 and dropped back into the fermenter 10 from the exhaust port 17. Therefore, it is possible to shake off the dust accumulated on the filter cloth 52 and return it to the fermenter 10 without removing the filter cloth 52 from the exhaust port 17, and the workload for maintaining the filter cloth 52 can be reduced.

[0132] As shown in FIG. 11, in the second embodiment, the upper part of the box-shaped lid 51 is freely openable by the openable lid 51a which can be freely closed. Therefore, the openable lid 51a is opened to open the upper part of the box-shaped lid 51, and the dust accumulated inside the bag-shaped filter cloth 52 can be easily shaken off by inserting a hand into the inside of the box-shaped lid 51 and applying vibrations by hitting, pressing, shaking or pulling the bag-shaped filter cloth 52. That is, in a state where the bag-shaped filter cloth 52 is attached to the exhaust port 17, the dust accumulated inside the bag-shaped filter cloth 52 can be shaken off and the clogging of the filter cloth 52 can be easily eliminated. And, since the bag-shaped filter cloth 52 is placed over each exhaust port 17 of the fermenter 10 with its opening facing downward, the dust shaken off into the bag of the bag-shaped filter cloth 52 is returned to the fermenter 10 from the exhaust port 17 by its own weight. Therefore, maintenance to remove the dust adhering to the filter cloth 52 can be facilitated.

[0133] As described above, the maintenance of the bag-shaped filter cloth 52 may be performed, for example, by measuring and detecting the pressure inside the airtight box-shaped lid 51 and the pressure of the exhaust gas after passing through the box-shaped lid 51, and when the pressure exceeds a predetermined threshold value, the bag-shaped filter cloth 52 may be manually vibrated as described above, so that the dust adhering to the inside of the bag-shaped filter cloth 52 falls downward and is returned to the fermentation tank 10. Alternatively, a vibration means that is operated by a drive to vibrate the bag-shaped filter cloth 52 may be provided, and the vibration means may be used to vibrate the bag-shaped filter cloth 52, so that the dust adhering to the inside of the bag-shaped filter cloth 52 is shaken off and returned to the fermentation tank 10.

[0134] Furthermore, even if fine dust accumulates on the filter cloth 52 after long-term use, causing a large pressure loss, the bag-shaped filter cloth 52 is removably attached to the exhaust port 17 of the fermenter 10 by means of mounting fixture 54, so that the bag-shaped filter cloth 52 can be removed from the exhaust port 17 of the fermenter 10 and cleaned or replaced.

[0135] Thus, according to the waste treatment device 1 of the above-mentioned embodiment 2, a blocking section 50 for blocking the passage of dust in the exhaust gas from the fermentation tank 10 is provided in an exhaust passage connecting the fermentation tank 10 as a treatment tank for decomposing waste using microorganisms with an exhaust section 71 for releasing exhaust gas from the fermentation tank 10 into the atmosphere, and the blocking section 50 has a bag-shaped filter cloth 52 as a filtration filter, and allows air to pass from the inner side to the outer side of the bag-shaped filter cloth 52, with the bag-shaped filter cloth 52 having an inner surface facing vertically downward to block the passage of dust. Therefore, dust contained in the exhaust gas that has flowed into the bag from the opening side of the bag-shaped filter cloth 52 is prevented from passing from the inner side to the outer side of the bag-shaped filter cloth 52, and in particular, the vertically downward inner surface of the bag-shaped filter cloth 52 prevents the passage of rising dust in the exhaust gas, allowing the dust to fall by its own weight. Therefore, dust is less likely to accumulate on the bag-shaped filter cloth 52, reducing the burden of maintenance.

[0136] According to the waste treatment device 1 of the above-mentioned embodiment 2, the blocking section 50 is a bag-shaped filter cloth 52 serving as a filtration filter that is placed over the exhaust port 17 provided on the upper side of the fermentation tank 10 serving as a treatment tank, and causes dust contained in the exhaust air to fall and be returned to the fermentation tank 10 through the exhaust port 17. That is, a bag-shaped filter cloth 52 is placed over the upper side of the exhaust port 17 provided on the upper surface of the fermenter 10, and the filter cloth 52 is open facing downward, so that dust particles prevented from passing by the downward inner surface of the filter cloth 52 fall by gravity and easily return from the exhaust port 17 to the inside of the fermenter 10. Thus, although the exhaust air from the exhaust port 17 of the fermenter 10 flows into the bag of the bag-shaped filter cloth 52 covering the exhaust port 17 of the fermenter 10, the downward inner surface of the filter cloth 52 prevents the dust particles contained in the exhaust air from passing from the inner side to the outer side of the bag-shaped filter cloth 52, and the dust particles fall within the bag by their own weight and are returned to the fermenter 10 from the exhaust port 17. In addition, the bag-shaped filter cloth 52 is made of a flexible material, so that it expands with the exhaust air flow from the fermenter 10 and contracts when the exhaust air stops, thereby making it possible to shake off the dust particles and return them to the fermenter 10. Therefore, dust is less likely to accumulate on the filter cloth 52, which reduces the maintenance burden.

[0137] Also in the waste treatment device 1 of the second embodiment, the bag-shaped filter cloth 52 opening vertically downward covers from above the exhaust port 17 provided above the fermenter 10, and dust that falls inside the bag-shaped filter cloth 52 by its own weight falls into the exhaust port 17 and is returned to the fermenter 10, eliminating the need for a separate configuration or recovery operation for recovering the fallen dust at the point where it falls, and facilitating maintenance and management. Furthermore, since the blocking section 50 is provided on the top surface above the fermenter 10, it does not take up any lateral installation space.

[0138] According to the waste treatment device 1 of the second embodiment, the blocking section 50 has a bag-shaped filter cloth 52 that is attached to the exhaust port 17 of the fermenter 10 and filters dust, and the exhaust air from the fermenter 10 passes from the inner side to the outer side of the bag-shaped filter cloth 52, filtering the dust during the process. If the filter cloth 52 is bag-shaped, even if dust accumulates on the inside of the filter cloth 52, the dust inside the bag-shaped filter cloth 52 can be easily shaken off and discharged from the bag opening side by vibrating the filter cloth 52. Therefore, even if dust accumulates on the filter cloth 52, it can be easily removed, and maintenance of the filter cloth 52 can be facilitated. That is, by vibrating the bag-shaped filter cloth 52 by hitting, pressing, shaking, pulling, or the like from the outside, the dust accumulated inside the bag-shaped filter cloth 52 can be shaken off, and the dust shaken off inside the bag of the bag-shaped filter cloth 52 can be dropped and returned to the fermenter 10 from the exhaust port 17. Therefore, even without removing the filter cloth 52 from the exhaust port 17, the dust accumulated on the filter cloth 52 can be shaken off and returned to the fermenter 10, and the workload for maintaining the filter cloth 52 can be simplified.

[0139] Incidentally, in the waste treatment device 1 of the above-mentioned embodiment 2, as in the above-mentioned embodiment 1, a blocking section 50 is provided on the upper surface of the fermentation tank 10 to cover the exhaust port 17 formed on the upper surface of the fermentation tank 10 from above. However, when implementing the present invention, as in the above-mentioned modification example 3, a blocking section 50 may be provided on the side surface of the fermentation tank 10 to cover the exhaust port 17 formed on the side surface of the fermentation tank 10, and in this case, the lower surface side of the bag-shaped filter cloth 52 will have an inclined section 58. Furthermore, as in the above-mentioned variant example 1, instead of the bag-shaped filter cloth 52 attached to the exhaust port 17, a flat filter filter 52A may be provided inside the box-shaped lid 51 above the exhaust port 17, so that the vertically downward inner surface of the filter filter 52A prevents dust in the exhaust from rising and allows the dust to fall by its own weight.

[0140] Furthermore, the waste treatment device 1 of the above-mentioned second embodiment has a simple configuration in which dust that has fallen due to its own weight inside the bag-shaped filter cloth 52 is dropped and returned from the exhaust port 17 to the fermenter 10, but when the present invention is implemented, a configuration in which the dust is collected at the point where it has fallen may be used. That is, in the above-mentioned second embodiment, the bag-shaped filter cloth 52 of the blocking section 50 is configured to cover the exhaust port 17, so that dust that has fallen inside the bag of the bag-shaped filter cloth 52 falls and returns to the fermenter 10 through the exhaust port 17, but when the present invention is implemented, for example, a configuration in which the blocking section 50 is provided at the end of a pipe attached to the exhaust port 17, and the dust that has fallen there is discharged from an outlet separate from the exhaust port 17 may be used.

[0141] In carrying out the present invention, the configuration, material, ingredients, size, connection relationship, and the like of other parts of the waste treatment device 1 are not limited to the above-mentioned embodiment and modified examples. For example, in the above embodiment, the deodorizing device 70 is exemplified as a deodorizing method using a porous material such as activated carbon (adsorption method) and a catalyst (catalytic oxidation method), but when implementing the present invention, it is also possible to use a biological deodorizing method, a water washing scrubber type, etc. In addition, in the above embodiment, the air is pressurized and sent to the fermentation tank 10 by the blower 30. However, when implementing the present invention, if the configuration allows air to be taken into the fermentation tank 10, air may be taken into the fermentation tank 10 by sucking in air from the exhaust side.

[0142] Furthermore, in the waste treatment device 1 of the above-mentioned first and second embodiments and the first to fourth modifications, the box-shaped lid 51 and the bag-shaped filter cloth 52 are installed to cover the exhaust port 17 provided at the upper position of the fermenter 10. However, when the present invention is implemented, if dust contained in the exhaust air from the fermenter 10 can be dropped between the fermenter 10 and the deodorizing device 70, the blocking unit 50 does not need to be adjacent to the exhaust port 17. For example, the bag-mouth side of the bag-shaped filter cloth 52 may be turned upward, and the exhaust air may be lowered into the bag-shaped filter cloth 52 and passed from its inner side to its outer side. Even if dust flows into the bag from the opening side of the bag-shaped filter cloth 52, the passage from the inner side to the outer side is prevented, and the dust accumulates in the bag-shaped filter cloth 52. However, the dust accumulated in the bag-shaped filter cloth 52 can be discharged from the opening side of the bag-shaped filter cloth 52, thereby reducing the burden of maintenance.

[0143] In the above embodiment, the rotating shaft 21 of the agitator 20 is arranged to extend in the left-right direction within the fermentation tank 10, but when implementing the present invention, the rotating shaft 21 may be arranged to extend in the up-down direction, making the fermentation tank 10 a vertical type that allows for space-saving installation. In addition, when implementing the present invention, it is possible to provide the insertion opening 41 on the side portion, and it is also possible for the insertion opening 41 and the removal opening 43 to be combined into one. In the above description of the first and second embodiments and the first to fourth modifications, a plurality of exhaust ports 17 (two in the drawings) are provided on the upper wall of the fermenter 10, but the number of exhaust ports 17 may be one or three or more. In addition, the box-shaped lid 51 covering the exhaust ports 17 is not limited to a form that collectively covers the plurality of exhaust ports 17, and may be a form in which a box-shaped lid 51 is provided for each exhaust port 17. Furthermore, the exhaust ports 17 may be attached in a form in which a bag-shaped filter cloth 52 collectively covers the plurality of exhaust ports 17. Furthermore, the waste treatment device 1 in the above embodiment has been described as being for commercial use with a large amount of waste treatment, but it can also be applied to a home use device.

[0144] In the above-mentioned first and second embodiments and first to fourth variations, the waste treatment device is described as an example of a fermentation decomposition treatment device using microorganisms, but the present invention can also be applied to a dry-type composter that reduces the volume of waste by drying at high temperatures. Since the device that reduces the volume of waste by drying at high temperatures also dries the waste by blowing hot air, the treatment tank is ventilated, and dust is contained in the exhaust from the treatment tank that dries the waste, so that, as in the above-mentioned first embodiment and first to fourth variations, a collision body that moves with the exhaust flow from the treatment tank that reduces the volume of waste by drying is accommodated in a closed space of a predetermined volume, and the dust contained in the exhaust from the treatment tank is dropped by the collision body that moves in the closed space with the exhaust flow from the treatment tank, and a blocking section that blocks the passage of the dust can be provided in the exhaust passage through which the exhaust from the treatment tank communicates with the exhaust section, thereby removing dust from the exhaust. Such a dry type composter as a waste treatment device comprises a treatment tank which reduces the volume of waste by drying it, an exhaust section which releases exhaust gas from the treatment tank into the atmosphere, and a blocking section which is provided in an exhaust passage which connects the exhaust gas from the treatment tank to the exhaust section and which uses an impactor which moves within the closed space due to the exhaust flow to cause dust contained in the exhaust gas from the treatment tank to fall and prevent the dust from passing through.

[0145] Also, as in the case of the above-mentioned embodiment 2, by providing a blocking section in an exhaust passage through which the exhaust from the treatment tank communicates with the exhaust section, the blocking section is attached to the exhaust port of the treatment tank which reduces the volume of the waste by drying, and the exhaust from the treatment tank passes through the bag-shaped filter cloth from the inside to the outside, thereby preventing the passage of dust contained in the exhaust from the treatment tank. Such a dry-type composter as a waste treatment device comprises a treatment tank which reduces the volume of the waste by drying, an exhaust section which releases the exhaust from the treatment tank to the atmosphere, and a blocking section which is provided in the exhaust passage through which the exhaust from the treatment tank communicates with the exhaust section, and prevents the passage of dust contained in the exhaust from the treatment tank by the bag-shaped filter cloth which prevents the passage of the exhaust from the treatment tank. [Explanation of symbols]

[0146] 1 Waste treatment equipment 10 Fermentation tank (treatment tank) 50 Blocking part 55 Confined Space 52 Filter cloth (filter) 52A Filtration Filter 53 Collider 71 Exhaust section

Claims

1. A treatment tank for decomposing waste with microorganisms or reducing the volume of the waste by drying; an exhaust unit that releases exhaust gas from the treatment tank into the atmosphere; a blocking section that is provided in an exhaust passage through which the exhaust from the treatment tank is communicated with the exhaust section, and that causes dust contained in the exhaust from the treatment tank to fall using an impactor that moves within a closed space due to the exhaust flow, thereby blocking the passage of the dust; A waste treatment device comprising:

2. The waste treatment device according to claim 1, characterized in that the blocking portion covers an exhaust port provided above the treatment tank, causing dust contained in the exhaust gas to fall and return to the treatment tank through the exhaust port.

3. 2. The waste treatment device according to claim 1, wherein the blocking section has a filter for filtering the dust.

4. The waste treatment device according to claim 1, characterized in that the blocking section houses the impact body within a bag-shaped filter cloth that filters the dust, and passes exhaust air from the treatment tank from the inner side to the outer side of the bag-shaped filter cloth.

5. 2. The waste treatment device according to claim 1, wherein the collision body is spherical.

6. 2. The waste treatment device of claim 1, wherein the impactor has a gap space.

7. A treatment tank for decomposing waste with microorganisms or reducing the volume of the waste by drying; an exhaust unit that releases exhaust gas from the treatment tank into the atmosphere; a blocking section provided in an exhaust passage through which exhaust from the treatment tank is communicated with the exhaust section, the blocking section having a vertically downward inner surface that blocks the passage of dust contained in the exhaust from the treatment tank by a filter that passes the exhaust from the treatment tank from its inner surface side to its outer surface side, the filter having a vertically downward inner surface that blocks the passage of the dust; A waste treatment device comprising:

8. The waste treatment device described in claim 7, characterized in that the blocking section is a bag-shaped filter cloth serving as a filtration filter that covers an exhaust port provided above the treatment tank, and causes dust contained in the exhaust to fall and return to the treatment tank from the exhaust port.

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