Methane fermentation treatment method and methane fermentation treatment system

Abstract

To provide a methane fermentation treatment method which can favorably select materials adequate for fermentation such as light weight paper refuse from garbage that is an object to be processed and perform methane fermentation.SOLUTION: A methane fermentation treatment method of an object to be processed that is garbage containing materials adequate for fermentation such as paper refuse comprises: a first crushing and screening step which crushes the object to be processed and selects materials adequate for fermentation from the crushed object to be processed; a humidification step which humidifies residuals containing the material adequate for fermentation selected at the first crushing and screening step to humidify paper refuse included in the residuals; a screening step which selects materials adequate for fermentation including paper refuse from the humidified residuals at the humidification step; and a methane fermentation treatment step which performs methane fermentation treatment of the material adequate for fermentation selected at the screening step in a methane fermentation treatment apparatus.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention selects materials suitable for fermentation from materials to be processed. and methane fermentation treatment system for methane fermentation using a methane fermentation treatment method Regarding. [Background technology]

[0002] As described in Patent Document 1, in order to realize a resource-circulating society, efforts are being made to put into practical use methane fermentation processing, which uses anaerobic microorganisms to convert organic solid waste such as food waste and paper waste into biogas (containing approximately 60% methane gas, approximately 40% carbon dioxide gas, and small amounts of hydrogen sulfide) that can be used as an energy source.

[0003] Various crushing and sorting equipment is used to separate organic solid waste, such as food waste and paper waste, suitable for fermentation from general waste discarded by ordinary households and commercial waste discarded by restaurants and other businesses (hereinafter referred to as "waste"), and to supply it to methane fermentation equipment.

[0004] Patent Document 2 discloses a food waste sorting machine that includes a cylindrical crushing chamber into which materials to be crushed are fed as a crushing impeller rotates and crushed while being sent out in the axial direction of the crushing impeller, a sieve surface that defines the lower inner circumferential surface of the crushing chamber to shake off the crushed materials inside the crushing chamber, and a residue discharge port formed in the upper inner circumferential surface at the end of the crushing chamber to discharge to the outside any residue that has not been sieved off the sieve surface and has reached the end of the crushing chamber in the direction in which the materials to be crushed are sent out. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-86157 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-101202 Summary of the Invention [Problem to be solved by the invention]

[0006] When a uniaxial crusher is used as a crushing and sorting device, hard resins and other materials that are unsuitable for fermentation are crushed at the same time, and when the crushed material is sorted by air, the crushed hard resin pieces get mixed in with the heavy kitchen waste, while paper waste, which is suitable for fermentation, gets mixed in with the lighter materials such as pieces of polyvinyl chloride resin used for packaging, which are unsuitable for fermentation, making it difficult to sort them properly.

[0007] Furthermore, in a crushing and sorting machine such as that disclosed in Patent Document 2, the crushing impeller is unable to crush the paper waste effectively, and the waste is not sieved off the sieve surface as material suitable for fermentation but is mixed in with material unsuitable for fermentation, so separation is also not possible.

[0008] In view of the above-mentioned prior art, an object of the present invention is to provide a method for effectively selecting materials suitable for fermentation, such as lightweight paper waste, from waste materials to be treated. and methane fermentation treatment system capable of methane fermentation using a biomass-derived methane fermentation process. The purpose is to provide [Means for solving the problem]

[0009] In order to achieve the above object, the present invention Methane fermentation treatment method The first characteristic configuration of A method for methane fermentation treatment of a material to be treated, wherein the material to be treated is waste containing a material suitable for fermentation, including paper; a first crushing and sorting step of crushing the material to be treated and selecting materials suitable for fermentation from the crushed material; and a second crushing and sorting step of humidifying the residue from which materials suitable for fermentation have been selected. and moisten the paper contained in the residue. a humidifying step, and a step of humidifying the residue including paper A selection process for selecting materials suitable for fermentation; and a methane fermentation treatment step of subjecting the fermentation-suitable material selected in the selection step to methane fermentation treatment in a methane fermentation treatment device. It's at the point.

[0010] In the crushing and sorting process, waste is crushed, and materials suitable for fermentation are sorted from the crushed materials. For example, paper, which is relatively light compared to kitchen waste, which is suitable for fermentation, is not crushed sufficiently, so it is not sorted as suitable for fermentation in the crushing and sorting process and is included in the residue, which is unsuitable for fermentation. However, in the humidifying process, the paper contained in the residue absorbs moisture and increases in weight, allowing it to be properly sorted as suitable for fermentation, improving the recovery rate of materials suitable for fermentation. In the humidifying process, the degree of moisture absorption of the paper can be adjusted to a level that allows for proper sorting, so the moisture content of the materials suitable for fermentation sorted in the sorting process can be kept low, and the subsequent methane fermentation process Process This prevents excessive increase in the amount of liquid, allowing for efficient fermentation.

[0011] The second characteristic feature of the present invention is that, in addition to the first characteristic feature described above, the sorting step is a second crushing and sorting step that is carried out together with crushing.

[0012] The paper contained in the residue moistened in the moistening process absorbs moisture and increases in weight, making it more susceptible to impact from the blades, allowing it to be properly sorted as material suitable for fermentation, improving the recovery rate of material suitable for fermentation. In the moistening process, the degree of moisture absorption of the paper can be adjusted to a level that allows it to be easily crushed, so the moisture content of the material suitable for fermentation selected in the sorting process can be kept low, preventing an excessive increase in the liquid volume in the subsequent methane fermentation process and allowing for efficient fermentation.

[0013] The third characteristic configuration is that, in addition to the second characteristic configuration described above, the second crushing and sorting process is carried out in the first crushing and sorting process by circulating and transporting the residue moistened in the moistening process to the first crushing and sorting process.

[0014] The residue discharged in the first crushing and sorting process can be crushed and sorted by being recycled and transported back to the first crushing and sorting process, which reduces the equipment costs required to perform each crushing and sorting process. In addition, the more times the waste is recycled, the higher the accuracy of sorting suitable for fermentation, and the target recovery rate can be achieved by adjusting the number of times.

[0015] The fourth characteristic configuration of the present invention is, in addition to any one of the first to third characteristic configurations described above, The moistening device is equipped with a spray nozzle that sprays water onto the residue. It's at the point.

[0016] By spraying water onto the residue through a spray nozzle, The target recovery rate can be adjusted.

[0017] The fifth characteristic configuration of the present invention is, in addition to any one of the first to fourth characteristic configurations described above, The method further includes an image capturing step of capturing an image of the residue after the fermentation-suitable material is selected in the first crushing and selection step. It's at the point.

[0018] The state of the residue can be properly confirmed based on the image of the residue after the material suitable for fermentation has been selected in the first crushing and selection step.

[0019] According to the present invention Methane fermentation treatment system The first characteristic configuration of A methane fermentation treatment system for a material to be treated, wherein the material to be treated is waste containing a material suitable for fermentation, including paper; A first crushing and sorting device including a crushing section for crushing the material to be processed and a sorting section for sorting the material suitable for fermentation from the crushed material to be processed; Moisturize the residue to moisten the paper contained in the residue A humidifying device and a residue humidified by the humidifying device including paper A sorting device having a sorting unit that sorts out materials suitable for fermentation; and a methane fermentation treatment device for subjecting the fermentation-suitable materials selected by the selection device to methane fermentation treatment. It's at the point.

[0020] The second characteristic configuration is that, in addition to the first characteristic configuration described above, the sorting device is a second crushing and sorting device that includes a crushing unit that crushes the residue humidified by the humidifying device, and sorts the residue crushed by the crushing unit in the sorting unit.

[0021] The third characteristic configuration is that, in addition to the second characteristic configuration described above, the first crushing and sorting device and the second crushing and sorting device are combined and equipped with a conveying mechanism that circulates and conveys the residue humidified by the humidifying device to the first crushing and sorting device.

[0022] The fourth characteristic configuration of the present invention is, in addition to any one of the first to third characteristic configurations described above, The moistening device is equipped with a spray nozzle that sprays water onto the residue. It's at the point.

[0023] The fifth characteristic configuration of the present invention is, in addition to any one of the first to fourth characteristic configurations described above, The apparatus further includes a photographing device for photographing an image of the residue after the first crushing and sorting device has selected the material suitable for fermentation. It's at the point. [Effects of the Invention]

[0024] As described above, according to the present invention, it is possible to effectively separate light-weight waste paper and other materials suitable for fermentation from waste materials to be treated. and methane fermentation treatment system capable of methane fermentation using a biomass-derived methane fermentation process. We are now able to provide the following. [Brief explanation of the drawings]

[0025] [Figure 1] 1(a) is a cross-sectional view of the main part of a crushing and sorting device suitable for the methane fermentation treatment method according to the present invention, and FIG. 1(b) is a side view of a crushing impeller. [Figure 2] Illustrative diagram of the methane fermentation treatment method according to the present invention [Figure 3] FIG. 1 is an explanatory diagram showing another embodiment of the methane fermentation treatment method according to the present invention. [Figure 4] FIG. 1 is an explanatory diagram showing another embodiment of the methane fermentation treatment method according to the present invention. [Figure 5] FIG. 1 is an explanatory diagram showing another embodiment of the methane fermentation treatment method according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention will now be described with reference to the drawings. Methane fermentation treatment method and methane fermentation treatment system Explain. [Explanation of the crushing and sorting equipment] In Figure 1(a), Methane fermentation treatment method The crushing and sorting device 1 shown in the figure is a crushing and sorting device 1 used in a crushing and sorting machine. The crushing and sorting device 1 is equipped with a cylindrical drum 2 arranged on a stand so that its axis P is horizontal, a crushing impeller 4 housed inside the drum 2 and having a plurality of crushing blades 5 attached in a comb-like manner to a rotating shaft 3 arranged along the axis P of the drum 2, an input hopper 6 opening above one end of the drum 2, and a discharge outlet 7 opening on the other end of the drum 2. A motor for rotating the crushing impeller 4 is arranged on the side of the drum 2.

[0027] A pair of screw conveyors 8 are arranged in parallel along the bottom of the feeding hopper 6. For example, waste transported by a belt-type conveyor mechanism is dropped into the feeding hopper 6 from above, and then fed by the screw conveyors 8 into the crushing and sorting space inside the drum 2. A motor that rotates and drives the screw conveyors 8 is arranged on the side wall of the feeding hopper 6.

[0028] The shaft of the outer periphery of the drum 2 heart In the area below P, a sieve mechanism 2A is configured, which is made of punched metal and has a plurality of openings with diameters of, for example, about 30, 50, or 75 mm.

[0029] As shown in Figure 1(b), the crushing impeller 4 has the crushing blades 5 attached to the rotating shaft 3 via attachments 3A and 3B so that the crushing blades 5 are positioned in a cross shape when viewed from the axial direction, and the crushing blades 5 are swingably attached via swing shafts 5A. This is to prevent damage by swinging the crushing blades 5 when the material to be processed contains hard materials such as metal. However, swinging of the crushing blades 5 is not essential.

[0030] The waste supplied to the crushing and sorting space contains organic waste such as kitchen waste and paper, which are suitable for fermentation, as well as miscellaneous waste such as glass, resin, ceramic fragments, and metal fragments, which are not suitable for fermentation.

[0031] As such waste collides with multiple crushing blades 5 and is shear-crushed or impact-crushed while being transported along the axis toward the discharge outlet 7, materials suitable for fermentation fall through the openings in the sieve mechanism 2A, are collected by a conveyor mechanism installed below the sieve mechanism 2A, and are supplied to the methane fermentation device.

[0032] On the other hand, the torn bags of sheet-like resin, metal, and other materials unsuitable for fermentation are not easily torn even when they collide with the crushing blade 5, but are transported downstream, where they are scraped up by the discharge blade 9 located at the most downstream side of the rotating shaft 3 and discharged from the discharge outlet 7.

[0033] Paper, which is suitable for fermentation, is very light, just like sheet-like resin, and is able to withstand the impact force from the blade, so it is not easily broken even when it collides with the crushing blade 5, and there is a tendency for a high proportion of it to be discharged from the discharge outlet 7 along with materials unsuitable for fermentation.

[0034] Even if sorting using a wind-powered sorting mechanism is adopted instead of sorting using the sieve mechanism 2A, paper, like sheet-like resin, is lighter than materials suitable for fermentation such as kitchen waste, and so tends to be sorted into materials unsuitable for fermentation.

[0035] Therefore, it has been very difficult to sort and recover paper products mixed in with waste as materials suitable for fermentation. The method and system for sorting materials suitable for fermentation of the present invention make it possible to efficiently sort and recover such paper products as materials suitable for fermentation.

[0036] [ Methane fermentation treatment method [Explanation] As shown in Figure 2, Methane fermentation treatment method teeth, A method for methane fermentation treatment of a material to be treated, wherein the material to be treated is waste containing a material suitable for fermentation, including paper; A first crushing and sorting process in which the material to be processed is crushed and the crushed material is sorted into materials suitable for fermentation, and a second crushing and sorting process in which the residue from which the material suitable for fermentation has been sorted out is humidified. and moisten the paper contained in the residue. From the humidification process and the residue humidified in the humidification process including paper A selection process for selecting materials suitable for fermentation; and a methane fermentation treatment step of subjecting the fermentation-suitable material selected in the selection step to methane fermentation treatment in a methane fermentation treatment device. .

[0037] In the first crushing and sorting process, waste is crushed by shear or impact, and materials suitable for fermentation are sorted from the crushed materials. Paper, which is relatively light compared to kitchen waste, is not crushed sufficiently, so it is not sorted as materials suitable for fermentation in the first crushing and sorting process and is included in the residue, which is materials unsuitable for fermentation.

[0038] However, the paper contained in the residue that is moistened in the moistening process absorbs moisture, increases in weight, and becomes more susceptible to impact, so it can be easily crushed in the second crushing and sorting process and properly sorted as material suitable for fermentation.

[0039] In the humidification process, the degree of moisture absorption of the paper can be adjusted to a level that allows it to be easily crushed, so the moisture content of the fermentation-suitable material selected in the second crushing and sorting process can be kept low.This prevents excessive increase in liquid volume in the subsequent methane fermentation process, allowing for efficient fermentation processing.

[0040] It is preferable to have an inspection step for inspecting whether or not the residue discharged in the first crushing and sorting step contains a material suitable for fermentation. If the residue contains only a small amount of material suitable for fermentation, it is transported directly to an unsuitable material processing device. The inspection step can be performed by an operator visually inspecting the residue directly or based on images captured by an imaging device. The captured images may also be processed to automatically determine the level of material suitable for fermentation. In particular, it is preferable to automatically determine the amount of paper contained as material suitable for fermentation.

[0041] The humidifying step is a step of spraying water onto the residue through a spray nozzle, and preferably includes a spray amount adjustment process for adjusting the amount of spray based on the amount of fermentation-suitable substances contained in the residue after the fermentation-suitable substances have been selected in the first crushing and sorting step. The amount of spray from the spray nozzle is appropriately adjusted in the humidifying step based on the paper content.

[0042] For example, it is preferable to provide a machine learning device that separates an image of miscellaneous residue into regions based on color and shape, and determines the amount of paper based on the shape and color of each separated region, and if the machine learning device determines that the paper content is above a predetermined threshold, proceed to a humidification process, and if it determines that the paper content is below the predetermined threshold, transport the image to an unsuitable material treatment device.

[0043] Such a machine learning device can be used to configure a spray amount adjustment mechanism. For example, the spray amount adjustment mechanism can be configured with a machine learning device that includes an input unit that inputs a photographed image of the residue, a calculation unit that calculates the amount of water to be sprayed based on the photographed image input to the input unit, and an output unit that outputs the amount of water to be sprayed calculated by the calculation unit.

[0044] Specifically, the machine learning device can be configured with a neural network, etc., and the pre-processing unit can separate images of miscellaneous residues into regions based on color and shape, determine and output the amount of paper contained in each region based on the shape and color of each region, and determine and output the amount of spray.

[0045] Figure 3 shows: Methane fermentation treatment method Another embodiment of the present invention is shown. The second crushing and sorting process is configured to circulate and transport the residue humidified in the humidifying process to the first crushing and sorting process, which is then carried out in the first crushing and sorting process. In other words, this is an embodiment in which waste is circulated and supplied to the first crushing and sorting process. In this embodiment, the crushing and sorting process is not carried out continuously, but a certain amount of waste is batch-treated in the first crushing and sorting process, and then the residue is circulated again to the first crushing and sorting process for batch treatment. One circulation is sufficient, but it is also possible to circulate multiple times based on the results of the inspection process.

[0046] The second crushing process can be carried out by circulating and transporting the residue discharged from the first crushing and sorting process to the first crushing and sorting process, which reduces the equipment costs required to carry out each crushing and sorting process. In addition, the more times the process is circulated and transported, the higher the accuracy of selecting materials suitable for fermentation.

[0047] Figure 4 shows the Methane fermentation treatment method The crushing and sorting device 1 is shown as being suitable for carrying out the above. The cylindrical drum of the crushing and sorting device 1 extends long in the axial direction, and a first crushing and sorting area where the first crushing and sorting process is carried out is provided upstream near the input hopper, and a second crushing and sorting area where the second crushing and sorting process is carried out is provided downstream near the discharge section. A spraying mechanism is provided between the first crushing and sorting area and the second crushing and sorting area.

[0048] Figure 5 shows: Methane fermentation treatment method Another aspect of the invention is shown. The relevant Methane fermentation treatment methodThe method comprises a humidifying step of humidifying the material to be treated, and a crushing and sorting step of crushing the material humidified in the humidifying step and selecting materials suitable for fermentation from the crushed material, wherein the humidifying step is a step of spraying water onto the material to be treated and includes a spray amount adjustment step of adjusting the amount of spray based on the amount of materials suitable for fermentation mixed in the material to be treated. It is preferable to circulate the residue remaining after the materials suitable for fermentation have been selected in the crushing and sorting step to the humidifying step, which improves the recovery rate of the materials suitable for fermentation.

[0049] By humidifying the materials to be treated before the crushing and sorting process, paper can be properly sorted into materials suitable for fermentation during the crushing and sorting process. The amount of fermentation-suitable materials mixed in can be measured at the beginning of the materials to be treated or in the residue after sorting, and the amount of humidification can be adjusted based on the results.

[0050] In the above example, the first and second crushing and sorting processes use a crushing and sorting device 1 that employs a sieving sorting method, but the sorting process for fermentation-suitable materials carried out in the first crushing and sorting process and / or the second crushing and sorting process may employ either a sieving sorting method or an air sorting method.

[0051] Even if the paper is not sufficiently crushed in the first crushing and sorting process and is not sorted into the fermentation-suitable material by the sieve sorting method or the wind sorting method, its weight increases by going through the humidifying process, and the weight difference is utilized in the sorting process to separate heavy materials such as humidified paper into fermentation-suitable materials, and lighter materials such as resin fragments into materials unsuitable for fermentation, so that they are sorted and recovered into the fermentation-suitable material. Furthermore, since no crushing is performed in the sorting process, a crushing mechanism is not required, and the device configuration is simplified. In addition to wind sorting, weight sorting that utilizes weight differences, such as vibration sorting, may also be used to separate heavy materials such as humidified paper by weight difference.

[0052] [ Methane fermentation treatment System Description] As explained in Figs. 1 and 2, A methane fermentation treatment system for a material to be treated, wherein the material to be treated is waste containing a material suitable for fermentation, including paper; a first crushing and sorting device provided with a crushing section for crushing the material to be processed and a sorting section for sorting the material suitable for fermentation from the crushed material to be processed; and a sorting device for sorting the material suitable for fermentation from the material to be processed; Moisturize the residue to moisten the paper contained in the residue From the humidifier and the residue humidified by the humidifier including paper A sorting device having a sorting unit that sorts out materials suitable for fermentation; a methane fermentation treatment device that performs methane fermentation treatment on the fermentation-suitable materials selected by the selection device; The device is configured with the following:

[0053] As explained in Figure 3, it is preferable that the first crushing and sorting device and the second crushing and sorting device are combined and equipped with a transport mechanism that circulates and transports the residue humidified by the humidifier to the first crushing and sorting device. When food waste is included in the materials to be processed, the moisture in the food waste contributes to the weight of the residue, so the recovery rate of material suitable for fermentation is improved even if the amount of spray is reduced.

[0054] As explained in FIG. 4, it is preferable that the first crushing and sorting device and the second crushing and sorting device are integrally arranged in tandem with the humidifying device in between.

[0055] It is preferable that the humidifying device is configured to include a spray nozzle that sprays water onto the residue, and a spray amount adjustment mechanism that adjusts the amount of spray based on the state of the fermentation-suitable materials contained in the residue from which the fermentation-suitable materials have been selected by the first crushing and sorting device.

[0056] It is preferable that the spray amount adjustment mechanism be composed of a machine learning device that includes an input unit that inputs a photographed image of the residue, a calculation unit that calculates the amount of water sprayed based on the photographed image input to the input unit, and an output unit that outputs the amount of water sprayed calculated by the calculation unit.

[0057] In the above-described embodiment, an example in which the residue is crushed and sorted in the second crushing and sorting step has been described, but the crushing step is not essential, and only the sorting step may be performed. Methane fermentation treatment method The waste material to be treated is sorted into suitable materials for fermentation, including paper. and ferment it into methane The method according to the present invention is a method for producing a food product, and the method may include a crushing and sorting step of crushing the material to be processed and selecting materials suitable for fermentation from the crushed material, a humidifying step of humidifying the residue from which materials suitable for fermentation have been selected in the crushing and sorting step, and a sorting step of crushing the residue moistened in the humidifying step and selecting materials suitable for fermentation from the crushed residue, and the sorting step may or may not include the crushing step. Methane fermentation treatmentIn the system, it is also possible to use a sorting device that does not have a crushing section but only has a sorting section instead of the second crushing and sorting device.

[0058] The above-described embodiment is one aspect of the present invention, and the present invention is not limited to this description. It goes without saying that the specific configuration of each part can be appropriately modified and designed within the scope of the effects of the present invention. [Explanation of symbols]

[0059] 1: Crushing and sorting equipment 2: Drums 2A: Sieve mechanism 3: Rotation axis 4: Crushing impeller 5: Crushing blade 6: Feeding hopper 7: Outlet 8:Screw conveyor P: shaft center

Claims

1. A method for methane fermentation treatment of a material to be treated, comprising the steps of: The material to be treated is waste containing fermentable materials including paper, A first crushing and sorting step of crushing the material to be treated and selecting materials suitable for fermentation from the crushed material; a moistening step of moistening the residue from which the fermentation-suitable materials have been selected in the first crushing and sorting step to moisten the paper contained in the residue, thereby increasing the weight of the paper; A sorting process in which the fermented matter containing paper is sorted as a heavy matter by using wind or vibration from the residue moistened in the moistening process; A methane fermentation treatment method comprising: the first crushing and sorting step; and a methane fermentation treatment step of subjecting the material suitable for fermentation sorted in the sorting step to methane fermentation treatment in a methane fermentation treatment device.

2. A method for methane fermentation treatment of a material to be treated, comprising the steps of: The material to be treated is waste containing fermentable materials including paper, A first crushing and sorting step of crushing the material to be treated and selecting materials suitable for fermentation from the crushed material; a moistening step of moistening the residue from which the fermentation-suitable materials have been selected in the first crushing and sorting step to moisten the paper contained in the residue, thereby increasing the weight of the paper; A second crushing and sorting process in which the residue moistened in the moistening process is crushed and a fermentation-suitable material including paper is selected from the crushed residue; a methane fermentation treatment step of subjecting the fermentation-suitable materials selected in the first crushing and sorting step and the second crushing and sorting step to methane fermentation treatment in a methane fermentation treatment device.

3. 3. The methane fermentation treatment method according to claim 2, wherein the second crushing and sorting step is performed in the first crushing and sorting step by circulating and transporting the residue moistened in the moistening step to the first crushing and sorting step.

4. 4. The methane fermentation treatment method according to claim 1, wherein the humidifying step comprises spraying water onto the residue.

5. 5. The methane fermentation treatment method according to claim 1, further comprising an image taking step of taking an image of the residue remaining after the material suitable for fermentation has been selected in the first crushing and selection step.

6. A methane fermentation treatment system for a material to be treated, comprising: The material to be treated is waste containing fermentable materials including paper, A first crushing and sorting device including a crushing unit for crushing the object to be processed and a sorting unit for sorting the crushed object to be processed into a fermentation-suitable object; a humidifying device for humidifying the residue from which the fermentable materials are selected by the first crushing and sorting device to humidify the paper contained in the residue, thereby increasing the weight of the paper; A sorting device having a sorting unit that sorts and processes the fermented material including paper from the residue moistened by the moistening device as a heavy material using wind force or vibration; A methane fermentation treatment system comprising the first crushing and sorting device and a methane fermentation treatment device which subjects the fermentation suitable material sorted by the sorting device to methane fermentation treatment.

7. A methane fermentation treatment system for a material to be treated, comprising: The material to be treated is waste containing fermentable materials including paper, A first crushing and sorting device including a crushing unit for crushing the object to be processed and a sorting unit for sorting the crushed object to be processed into a fermentation-suitable object; a humidifying device for humidifying the residue from which the fermentable materials are selected by the first crushing and sorting device to humidify the paper contained in the residue, thereby increasing the weight of the paper; A second crushing and sorting device including a crushing unit that crushes the residue humidified by the humidifying device and a sorting unit that sorts and processes fermentation-suitable materials including paper from the crushed residue; a methane fermentation treatment apparatus for subjecting the fermentation suitable materials selected by the first crushing and sorting apparatus and the second crushing and sorting apparatus to methane fermentation treatment.

8. 8. The methane fermentation treatment system according to claim 7, wherein the first crushing and sorting device and the second crushing and sorting device are combined into one device, and the methane fermentation treatment system further comprises a transport mechanism for circulating and transporting the residue humidified by the humidifying device to the first crushing and sorting device.

9. 9. The methane fermentation treatment system according to claim 6, wherein the humidifier includes a spray nozzle for spraying water onto the residue.

10. 10. The methane fermentation treatment system according to claim 6, further comprising a photographing device for photographing an image of the residue remaining after the material suitable for fermentation has been selected by the first crushing and sorting device.

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