Fermentation apparatus and fermentation method for organic matter

Abstract

The application discloses a fermentation equipment and method of organic matters. The equipment comprises a first fermentation tank, a conveying system and a semi-permeable area connected in sequence; the conveying system is used for conveying the materials in the first fermentation tank to the semi-permeable area; the semi-permeable area is provided with a material with pores with a pore size of 200 microns to 5 mm, and is used for separating the materials in the first fermentation tank; the semi-permeable area is further provided with a loop connected with the first fermentation tank, and the loop is used for conveying the separated materials with high solid content to the first fermentation tank. The fermentation equipment can effectively control the solid content in the fermentation equipment of the organic matters, thereby creating the best conditions for the propagation of anaerobic bacteria, shortening the fermentation time of the organic matters, increasing the biogas yield, and facilitating the operation of the instrument and the process stability.

Description

TECHNICAL FIELD

[0001] The present invention relates to a fermentation device and a fermentation method for organic matter. BACKGROUND

[0002] Anaerobic fermentation of organic matter is an important solution for the treatment of solid or liquid organic waste, and enables the conversion of organic matter into renewable energy gases and organic fertilizers. Anaerobic fermentation of organic matter is generally classified into three categories: anaerobic fermentation of wastewater when the solid content of the material to be treated is less than 5%; wet anaerobic fermentation when the solid content is between 5% and 20%; and dry anaerobic fermentation when the solid content of the organic matter is greater than 20%.

[0003] The main process for wet anaerobic fermentation is the complete mixing process: for example, using a completely stirred tank reactor (CSTR). In this type of reactor, the mixing of the medium is ensured by a mechanical stirrer immersed in the reactor, which is used to stir the entire reactor. Alternatively, mixing can be achieved by injecting biogas into the reactor, which is injected from the center of the reactor and causes strong mixing in the reactor. There is also mixing of the reactor by external circulation (recirculation of the material from one end of the fermentation tank to the other end by a pump).

[0004] In continuous dry anaerobic fermentation, the organic matter is introduced at one end of the fermentation tank and then advances in the form of a plug flow to the other end of the tank. These fermentation tanks can be horizontal or vertical. The mixing in these tanks is either by a slow stirrer that gradually pushes the material towards the outlet of the tank, or by a pump that recirculates the material from one end of the tank to the other end or by injecting biogas into the tank.

[0005] These techniques do not allow precise control of the solid content of the material in the tank. Thus, these techniques do not create optimal conditions for the multiplication of anaerobic bacteria. For the complete mixing technique, the residence time of the organic matter is at least 30 days, and for the continuous dry fermentation technique, it is at least 20 days. These techniques are also very sensitive to fluctuations in the organic load introduced into the tank (the amount of organic matter digested per day), and therefore, the organic load introduced into the tank must be precisely controlled to ensure proper operation of the equipment, which requires a great deal of expertise on the part of the operator and makes the operation very inflexible. In addition, without control of the solid content, these techniques encounter many problems of formation of a suspended layer and a settled layer, which are detrimental to the operation of the tank. At the same time, the maintenance of the mechanical stirring components in the tank is complex and expensive.

[0006] In batch dry fermentation technology, the solid organic matter is kept static in the fermentation tank. After the organic matter is fed into the reaction device, it is irrigated by liquid, and the liquid is recycled after sinking. In this kind of technology, the organic solid is not stirred, so the fermentation of the organic solid is very slow and difficult to control, and the residence time of each batch is about 60 days. In addition, this kind of technology is operated in batches. The discontinuous nature of this fermentation makes the operation of this technology particularly complex.

[0007] In order to be more widely used, anaerobic fermentation technology must reduce investment and operating costs, reduce the volume of the reactor in order to use in places with space limitations. Anaerobic fermentation technology must also improve fermentation efficiency to increase energy output, reduce pollution, and improve process stability to ensure production stability. SUMMARY

[0008] The present application provides an organic matter fermentation equipment and a fermentation method to solve the problems of difficult control of solid content in the organic matter fermentation equipment, long fermentation time, low efficiency, complex equipment, large volume and high operating cost in the prior art. The fermentation equipment of the present application can effectively control the solid content in the organic matter fermentation equipment, thereby creating optimal conditions for the reproduction of anaerobic bacteria, shortening the organic matter fermentation time, increasing the biogas yield, simplifying the instrument operation, and stabilizing the process.

[0009] The present application solves the above technical problems through the following technical solutions.

[0010] The present application provides an organic matter fermentation equipment, which comprises a first fermentation tank, a conveying system and a semi-permeable zone connected in sequence; the conveying system is used to convey the material in the first fermentation tank to the semi-permeable zone; the semi-permeable zone is provided with a material having pores with a size of 200 μm to 5 mm for separating the material in the first fermentation tank; the semi-permeable zone is also provided with a loop connected with the first fermentation tank, and the loop is used to convey the separated material with high solid content to the first fermentation tank.

[0011] In the present application, the first fermentation tank can be a conventional fermentation tank in the art.

[0012] Preferably, the first fermentor comprises a first inlet, a fifth inlet, a first outlet, a second outlet, a ninth outlet and a first fermentor material output pipeline; the first inlet is a feeding channel for the separated high solid content material; the fifth inlet is a feeding channel of the first fermentor, used for conveying fresh organic matter to be fermented into the first fermentor; one end of the first fermentor material output pipeline is connected with the first outlet, used for conveying the material in the first fermentor to the semi-permeable area through the conveying system; the second outlet is a gas collection channel of the first fermentor; the ninth outlet is a fermentation product discharge channel of the first fermentor, used for discharging fermentation products out of the first fermentor. In the present application, the fresh organic matter to be fermented refers to raw materials that have not been treated in the fermentation equipment.

[0013] Preferably, the first inlet is located at the upper part of the first fermentor.

[0014] Preferably, the fifth inlet is located at the upper part of the first fermentor.

[0015] In a preferred embodiment, the first inlet and the fifth inlet of the first fermentor can be the same inlet, that is, the first inlet can be both a feeding channel of the first fermentor and a feeding channel for the high solid content material.

[0016] Preferably, the first outlet is located at the lower part of the first fermentor.

[0017] Preferably, the second outlet is located at the upper part of the first fermentor.

[0018] Preferably, the ninth outlet is located at the lower part of the first fermentor.

[0019] Preferably, the first fermentor is not provided with a stirring component inside.

[0020] In the present application, the conveying system can be a conventional conveying system in the art, and the conveying system can adjust the conveying speed of the material.

[0021] In the present application, when the fermentation equipment is used, the high solid content material separated by the semi-permeable area is conveyed back to the first fermentor, and preferably, the semi-permeable area is also provided with a pipeline for discharging the separated low solid content material out of the semi-permeable area. The low solid content refers to a solid content less than that of the material in the first fermentor, and the high solid content refers to a solid content greater than that of the material in the first fermentor.

[0022] Preferably, the semi-permeable zone comprises a second inlet, a third outlet, a fourth outlet and a high solid content material output pipe. The second inlet is connected to the other end of the first fermenter material output pipe, forming the feeding channel of the semi-permeable zone. The third outlet is the discharging channel of low solid content material. The fourth outlet is the discharging channel of high solid content material. One end of the high solid content material output pipe is connected to the fourth outlet, and the other end is connected to the first fermenter, for conveying the separated high solid content material to the first fermenter.

[0023] Preferably, the semi-permeable zone is a slant, serpentine, vertical or horizontal device.

[0024] More preferably, when the semi-permeable zone is a horizontal device, the horizontal device is a serpentine pipe. More preferably, when the semi-permeable zone is a vertical device, the second inlet is located at the lower part of the semi-permeable zone. The third outlet is located at the lower part of the semi-permeable zone, and is higher than the second inlet. More preferably, the height of the third outlet from the bottom of the semi-permeable zone is within 15% of the height of the semi-permeable zone. The fourth outlet is located at the upper part of the semi-permeable zone.

[0025] Preferably, the semi-permeable material in the semi-permeable zone is cloth, stainless steel, plastic or ceramic, etc.

[0026] Preferably, the semi-permeable zone comprises a back flushing system, which can be conventional in the art, for cleaning the pores in the semi-permeable zone. More preferably, when the semi-permeable zone is a vertical device, the back flushing system is located at the upper part of the semi-permeable zone.

[0027] Preferably, the fermenting device comprises a flow rate adjusting device between the fourth outlet and the first inlet. The flow rate adjusting device can be conventional in the art, and can adjust the flow rate of the high solid content material in the semi-permeable zone.

[0028] Preferably, the fermenting device comprises a fifth outlet between the fourth outlet and the first inlet, which is the discharging channel of the downstream fermentation product of the semi-permeable zone.

[0029] Preferably, the fermenting device comprises a heating system between the fourth outlet and the first inlet.

[0030] In a preferred embodiment, the fourth outlet connects the semi-permeable zone to the flow rate adjusting device, the fifth outlet and the heating system in sequence.

[0031] In the present application, preferably, the fermentation device comprises a material introduction system connected with the first inlet or the fifth inlet, for introducing fresh organic matter to be fermented into the fermentation device.

[0032] In the present application, preferably, the fermentation device comprises a second fermentation tank; the second fermentation tank comprises a third inlet, a sixth outlet, a seventh outlet, an eighth outlet, a low-solid-content material input pipeline and a second fermentation tank material output pipeline; one end of the low-solid-content material input pipeline is connected with the semi-permeable zone (which can be the third outlet of the semi-permeable zone), and the other end is connected with the third inlet, for conveying the low-solid-content material into the second fermentation tank; the first fermentation tank comprises a fourth inlet; one end of the second fermentation tank material output pipeline is connected with the sixth outlet, and the other end is connected with the fourth inlet, for conveying part of the material in the second fermentation tank back to the first fermentation tank; the seventh outlet is used for discharging the remaining material in the second fermentation tank; and the eighth outlet is a gas collection channel of the second fermentation tank.

[0033] Preferably, the third inlet is located at the lower part of the second fermentation tank.

[0034] Preferably, the fourth inlet is located at the upper part of the first fermentation tank.

[0035] Preferably, the sixth outlet is located at the upper part of the second fermentation tank.

[0036] Preferably, the seventh outlet is located at the upper part of the second fermentation tank.

[0037] Preferably, the eighth outlet is located at the upper part of the second fermentation tank.

[0038] The present application also provides an organic matter fermentation method, which is performed by using the fermentation device as described above, and the steps of the method comprise: fermenting the organic matter in the first fermentation tank; conveying the material in the first fermentation tank to the semi-permeable zone for solid-liquid separation; discharging the low-solid-content material separated by the semi-permeable zone from the semi-permeable zone; and conveying the high-solid-content material separated by the semi-permeable zone back to the first fermentation tank.

[0039] Preferably, the low-solid-content refers to a solid content less than that of the material in the first fermentation tank; and the high-solid-content refers to a solid content greater than that of the material in the first fermentation tank.

[0040] The present invention allows for efficient mixing of the organic matter while ensuring control of the solids content in the first fermenter. The solids content in the first fermenter is controlled by the recirculation system which extracts the contents of the first fermenter (partially fermented solids and liquid), separates the solids from the liquid through the semi-permeable zone, discharges a portion of the contents (low solids content) and recirculates the separated contents (high solids content) back into the first fermenter. The recirculation rate and the amount of recirculated contents can be adjusted to control the solids content in the fermenter. Thus, the present invention allows for precise control of the solids content in the fermenter while efficiently mixing the entire contents of the fermenter. The simultaneous mixing and control of the solids content using a single system allows for fine control of both parameters, which is not possible with prior art systems.

[0041] The present invention can be used in the field of organic matter fermentation and is particularly suitable for the anaerobic fermentation of organic matter having a relatively high solids content (typically greater than 5%, preferably greater than 10%, more preferably greater than 15% and less than 35%). The organic matter is preferably one or more of solid organic waste or energy crops such as agricultural waste, industrial waste, waste generated in the food processing industry, food waste and municipal organic waste. For example, the industrial and municipal waste water treatment sludge.

[0042] The agricultural waste can include various types of crop straw and livestock manure generated from livestock and poultry farming. The waste generated in the food processing industry or food waste can include a mixture of various substances such as oil, water, fruit peels, vegetables, rice, fish, meat, and bones. The municipal organic waste can include household waste.

[0043] In the present invention, the solids content in the first fermenter is preferably between 10% and 40%, more preferably between 15% and 25%.

[0044] The inventors have noted that controlling the solids content and the agitation intensity in the fermenter are key parameters for the cultivation of the fermentation bacteria to ferment the organic matter. By controlling these parameters, the present invention creates optimal conditions for the cultivation of the fermentation bacteria. In addition, it ensures an efficient system for the discharge of soluble fermentation products. Therefore, the present invention allows for a significant reduction in the residence time of the organic matter compared to other anaerobic fermentation techniques. Thus, the volume of the fermenter using the present invention is smaller (the volume of the first fermenter or the second fermenter is only 30% of the volume of a dry fermentation device or only 15% of the volume of a wet fermentation device compared to prior art techniques; the volume of the device is calculated as the volume of the daily throughput multiplied by the residence time) compared to prior art techniques, thereby reducing the investment costs and the footprint. This also allows for a more complete fermentation of the organic matter in the present invention, thereby ensuring a greater degree of degradation of the organic matter and a 25% higher production of biogas than with traditional techniques.

[0045] In the present application, preferably, the average residence time of the organic matter in the first fermenter is 1-15 days.

[0046] In the present application, preferably, the reaction in the first fermenter is anaerobic fermentation.

[0047] In the present application, preferably, after stable operation, the amount of material delivered by the delivery system per day is 0.3-3 times the volume of the first fermenter.

[0048] In the present application, preferably, when the fermenting equipment comprises a second fermenter, after stable operation, the amount of material circulated from the second fermenter to the first fermenter per day is 0.2-3 times the volume of the first fermenter.

[0049] In the present application, preferably, the reaction in the second fermenter is anaerobic fermentation / aerobic fermentation, more preferably anaerobic fermentation.

[0050] In the present application, preferably, the temperature of the first fermenter is 20-60°C.

[0051] In the present application, preferably, the organic matter is fed into the first fermenter at least once a day.

[0052] On the basis of common knowledge in the art, the above-mentioned preferred conditions can be combined in any way to obtain preferred examples of the present application.

[0053] The reagents and raw materials used in the present application are commercially available.

[0054] The positive progress effect of the present application is that:

[0055] The fermenting equipment of the present application can effectively control the solid content in the organic matter fermentation equipment, thereby creating optimal conditions for the propagation of anaerobic bacteria, shortening the fermentation time of the organic matter, increasing the yield of biogas, and reducing the volume of the fermenter, thereby reducing the investment cost and land occupation.

[0056] The present application can prevent the formation of a suspended layer or a sediment layer, which is a common operating problem in the prior art anaerobic fermentation technology. The process is also particularly stable for fluctuations in the organic load of the organic matter fed into the fermenter, thus making the equipment easier to operate.

[0057] The present application does not require the installation of moving parts inside the main fermenter, thereby reducing and simplifying the maintenance operation. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 Schematic diagram of the device in Example 1.

[0059] Figure 2Figure 1 shows a schematic view of the apparatus used in Example 2.

[0060] Reference signs

[0061] First fermenter 1

[0062] Delivery system 2

[0063] Semi-permeable zone 3

[0064] First outlet 4

[0065] Third outlet 5

[0066] First inlet 6

[0067] Flow rate regulating device 7

[0068] Fifth outlet 8

[0069] Heating system 9

[0070] Material introduction system 10

[0071] Second fermenter 11

[0072] Fourth inlet 12

[0073] Backflush system 13

[0074] Second outlet 14

[0075] Eighth outlet 15

[0076] Ninth outlet 16

[0077] Fifth inlet 17

[0078] Second inlet 18

[0079] Fourth outlet 19

[0080] Sixth outlet 20

[0081] Seventh outlet 21

[0082] Third inlet 22 DETAILED DESCRIPTION

[0083] The application will be further described by way of example, but without limiting the application to the examples. In the following examples, the experimental methods are not specified if they are carried out according to conventional methods and conditions, or according to the instructions of the commercial products.

[0084] Example 1

[0085] As Figure 1As shown, the fermentation equipment for organic matter in the embodiment comprises a first fermentation tank 1, a conveying system 2 and a semi-permeable zone 3 connected in sequence; the conveying system 2 is used for conveying the material in the first fermentation tank 1 to the semi-permeable zone 3; the semi-permeable zone 3 is provided with a material having pores, the pore size of the material is 200 μm-5 mm, and the material is used for separating the material in the first fermentation tank 1; the semi-permeable zone 3 is further provided with a loop connected with the first fermentation tank 1, and the loop is used for conveying the high solid content material after separation to the first fermentation tank 1.

[0086] The first fermentation tank 1 comprises a first inlet 6, a fifth inlet 17, a first outlet 4, a second outlet 14, a ninth outlet 16 and a first fermentation tank material output pipeline; the first inlet 6 is a feeding channel for the high solid content material after separation; the fifth inlet 17 is a feeding channel of the first fermentation tank 1, which is used for conveying fresh organic matter to be fermented into the first fermentation tank 1; one end of the first fermentation tank material output pipeline is connected with the first outlet 4, which is used for conveying the material in the first fermentation tank 1 to the semi-permeable zone 3 through the conveying system 2; the second outlet 14 is a gas collection channel of the first fermentation tank 1; the ninth outlet 16 is a fermentation product discharge channel of the first fermentation tank 1, which is used for discharging the fermentation product out of the first fermentation tank 1. Wherein, the fresh organic matter to be fermented refers to the raw material which has never been treated in the fermentation equipment.

[0087] The first inlet 6 is located at the upper part of the first fermentation tank 1.

[0088] The fifth inlet 17 is located at the upper part of the first fermentation tank 1.

[0089] The first outlet 4 is located at the lower part of the first fermentation tank 1.

[0090] The second outlet 14 is located at the upper part of the first fermentation tank 1.

[0091] The ninth outlet 16 is located at the lower part of the first fermentation tank 1.

[0092] The first fermentation tank 1 is not provided with a stirring component inside.

[0093] The conveying system 2 can adjust the conveying speed of the material. When the fermentation equipment is used, the high solid content material separated by the semi-permeable zone 3 is conveyed back to the first fermentation tank 1. The semi-permeable zone 3 is further provided with a pipeline for discharging the low solid content material after separation out of the semi-permeable zone 3. Wherein, the low solid content refers to the solid content less than that of the material in the first fermentation tank 1, and the high solid content refers to the solid content greater than that of the material in the first fermentation tank 1.

[0094] The semi-permeable zone 3 includes a second inlet 18, a third outlet 5, a fourth outlet 19, and a high solids content material output pipe. The second inlet 18 is connected to the other end of the material output pipe of the first fermenter, forming the feed channel of the semi-permeable zone 3. The third outlet 5 is the discharge channel for low solids content materials. The fourth outlet 19 is the discharge channel for high solids content materials. One end of the high solids content material output pipe is connected to the fourth outlet 19, and the other end is connected to the first fermenter 1, for conveying the separated high solids content materials to the first fermenter 1.

[0095] The semi-permeable zone 3 is a vertical device. The second inlet 18 is located at the lower part of the semi-permeable zone 3. The third outlet 5 is located at the lower part of the semi-permeable zone 3 and is higher than the second inlet 18. The height of the third outlet 5 from the bottom of the semi-permeable zone 3 accounts for 15% of the height of the semi-permeable zone 3. The fourth outlet 19 is located at the upper part of the semi-permeable zone 3.

[0096] The semi-permeable material in semi-permeable zone 3 is fabric.

[0097] Example 2

[0098] like Figure 2 As shown, an organic fermentation device in this embodiment includes a first fermentation tank 1, a conveying system 2, and a semi-permeable zone 3 connected in sequence. The conveying system 2 is used to convey the material in the first fermentation tank 1 to the semi-permeable zone 3. The semi-permeable zone 3 is provided with a porous material with a pore size of 200μm to 5mm, which is used to separate the material in the first fermentation tank 1. The semi-permeable zone 3 is also provided with a circuit connected to the first fermentation tank 1, which is used to convey the separated material with a high solids content to the first fermentation tank 1.

[0099] The first fermenter 1 includes a first inlet 6, a first outlet 4, a second outlet 14, a ninth outlet 16, and a first fermenter material output pipe. The first inlet 6 is the feeding channel for the separated high-solids-content material. One end of the first fermenter material output pipe is connected to the first outlet 4, which is used to transport the material of the first fermenter 1 to the semi-permeable zone 3 via the conveying system 2. The second outlet 14 is the gas collection channel of the first fermenter 1. The ninth outlet 16 is the fermentation product discharge channel of the first fermenter 1, which is used to discharge the fermentation product from the first fermenter 1. Here, fresh organic matter to be fermented refers to raw materials that have never been processed by this fermentation equipment.

[0100] The first inlet 6 is located at the top of the first fermentation tank 1.

[0101] The first outlet 4 is located at the bottom of the first fermentation tank 1.

[0102] The second outlet 14 is located at the top of the first fermentation tank 1.

[0103] The ninth outlet 16 is located at the lower part of the first fermentation tank 1.

[0104] The first fermentation tank 1 is not provided with a stirring component.

[0105] The conveying system 2 can adjust the conveying speed of the material. In use of the fermentation equipment, the high solid content material separated by the semi-permeable zone 3 is conveyed back to the first fermentation tank 1. The semi-permeable zone 3 is also provided with a pipeline for discharging the low solid content material separated from the semi-permeable zone 3. The low solid content refers to the solid content less than that of the material in the first fermentation tank 1, and the high solid content refers to the solid content greater than that of the material in the first fermentation tank 1.

[0106] The semi-permeable zone 3 comprises a second inlet 18, a third outlet 5, a fourth outlet 19 and a high solid content material output pipeline. The second inlet 18 is connected with the other end of the first fermentation tank material output pipeline, forming a feeding channel of the semi-permeable zone 3. The third outlet 5 is a discharging channel for the low solid content material. The fourth outlet 19 is a discharging channel for the high solid content material. One end of the high solid content material output pipeline is connected with the fourth outlet 19. The fermentation equipment further comprises a flow rate adjusting device 7 located between the fourth outlet 19 and the first inlet 6, which can adjust the flow rate of the high solid content material in the semi-permeable zone 3. The other end of the high solid content material output pipeline is connected with the flow rate adjusting device 7, conveying the separated high solid content material to the first fermentation tank 1.

[0107] The semi-permeable zone 3 is a vertical equipment, and the second inlet 18 is located at the lower part of the semi-permeable zone 3. The third outlet 5 is located at the lower part of the semi-permeable zone 3 and is higher than the second inlet 18. The height of the third outlet 5 from the bottom of the semi-permeable zone 3 accounts for 10% of the height of the semi-permeable zone 3. The fourth outlet 19 is located at the upper part of the semi-permeable zone 3.

[0108] The semi-permeable material in the semi-permeable zone 3 is stainless steel.

[0109] The semi-permeable zone 3 comprises a back flushing system 13 located at the upper part of the semi-permeable zone 3.

[0110] The fermentation equipment comprises a fifth outlet 8 located between the fourth outlet 19 and the first inlet 6, which is a discharging channel for the downstream fermentation product of the semi-permeable zone 3.

[0111] The fermentation equipment comprises a heating system 9 located between the fourth outlet 19 and the first inlet 6.

[0112] The fourth outlet 19 connects the semi-permeable zone 3 with the flow rate adjusting device 7, the fifth outlet 8 and the heating system 9 in sequence.

[0113] The fermentation apparatus comprises a material introduction system 10 connected to the first inlet 6 for introducing fresh organic material to be fermented into the fermentation apparatus.

[0114] The fermentation apparatus comprises a second fermentation tank 11; the second fermentation tank 11 comprises a third inlet 22, a sixth outlet 20, a seventh outlet 21, an eighth outlet 15, a low solid content material input pipe and a second fermentation tank material output pipe; one end of the low solid content material input pipe is connected to the third outlet 5 of the semi-permeable zone 3, and the other end is connected to the third inlet 22, for conveying low solid content material into the second fermentation tank 11; the first fermentation tank 1 comprises a fourth inlet 12; one end of the second fermentation tank material output pipe is connected to the sixth outlet 20, and the other end is connected to the fourth inlet 12, for conveying part of the material in the second fermentation tank 11 back to the first fermentation tank 1; the seventh outlet 21 is used to discharge the remaining material in the second fermentation tank 11; and the eighth outlet 15 is a gas collection channel of the second fermentation tank 11.

[0115] The third inlet 22 is located at the lower part of the second fermentation tank 11.

[0116] The fourth inlet 12 is located at the upper part of the first fermentation tank 1.

[0117] The sixth outlet 20 is located at the upper part of the second fermentation tank 11.

[0118] The seventh outlet 21 is located at the upper part of the second fermentation tank 11.

[0119] The eighth outlet 15 is located at the upper part of the second fermentation tank 11.

[0120] Application Example 1

[0121] The volume of the first fermentation tank 1 is 60 m 3 .

[0122] 10 tons of cow dung can be treated per day. 900 m 3 of biogas can be produced per day, of which 55% is methane. 5.8 tons of liquid organic fertilizer can be discharged from the semi-permeable zone 3 per day. 3 tons of solid organic fertilizer can be discharged from the first fermentation tank 1 per day.

[0123] The solid content in the first fermentation tank 1 is maintained at 22%. The amount of material circulated by the conveying system 2 per day is 90 m 3 .

[0124] Application Example 2

[0125] The volume of the first fermentation tank 1 is 20 m 3 . The volume of the second fermentation tank 11 (UASB type fermentation tank) is 10 m3 .

[0126] 5 tons of sorted municipal organic waste (including kitchen waste) are treated.

[0127] 930 m 3 of biogas are produced per day, of which 58% is methane.

[0128] 0.22 tons of solid organic fertilizer are discharged from the first fermenter 1 per day; the flow of liquid organic fertilizer discharged from the second fermenter 11 is 3.6 tons per day.

[0129] The solids content in the first fermenter 1 is kept at 18%. The amount of material circulated per day by the transport system 2 is 40 m 3 . The flow rate from the second fermenter 11 back to the first fermenter 1 is 10 m 3 per day.

Claims

1. A method of fermentation of an organic material, characterized in that, The fermentation method of the organic matter is carried out by using an organic matter fermentation device, the organic matter fermentation device comprises a first fermentation tank, a conveying system and a semi-permeable zone connected in sequence; the conveying system is used for conveying the material in the first fermentation tank to the semi-permeable zone; the semi-permeable zone is provided with a material with pores, the pore size is 200 μm to 5 mm, and the material is used for separating the material in the first fermentation tank; the semi-permeable zone is also provided with a loop connected with the first fermentation tank, and the loop is used for conveying the high solid content material separated to the first fermentation tank; The first fermentation tank comprises a first inlet, a fifth inlet, a first outlet and a first fermentation tank material output pipeline; the first inlet is a feeding channel of the high solid content material separated; the fifth inlet is a feeding channel of the first fermentation tank, and is used for conveying fresh organic matter to be fermented into the first fermentation tank; One end of the first fermentation tank material output pipeline is connected with the first outlet, and is used for conveying the material in the first fermentation tank to the semi-permeable zone through the conveying system; The semi-permeable zone comprises a second inlet, a third outlet, a fourth outlet and a high solid content material output pipeline; the other end of the first fermentation tank material output pipeline is connected with the second inlet, forming a feeding channel of the semi-permeable zone; the third outlet is a discharging channel of the low solid content material; the fourth outlet is a discharging channel of the high solid content material; one end of the high solid content material output pipeline is connected with the fourth outlet, and the other end is connected with the first fermentation tank, and is used for conveying the high solid content material separated to the first fermentation tank; The fermentation device comprises a flow rate adjusting device, and the flow rate adjusting device is located between the fourth outlet and the first inlet; The fermentation method of the organic matter comprises the following steps: fermenting the organic matter in the first fermentation tank; conveying the material in the first fermentation tank to the semi-permeable zone for solid-liquid separation; discharging the low solid content material separated from the semi-permeable zone; and conveying the high solid content material separated from the semi-permeable zone back to the first fermentation tank; The low solid content refers to a solid content less than that of the material in the first fermentation tank; and the high solid content refers to a solid content greater than that of the material in the first fermentation tank; The average residence time of the organic matter in the first fermentation tank is 1 to 15 days; The reaction in the first fermentation tank is anaerobic fermentation; After stable operation, the amount of material conveyed through the conveying system is 0.3 to 3 times the volume of the first fermentation tank per day; When the fermentation device comprises a second fermentation tank, after stable operation, the amount of material circulated from the second fermentation tank to the first fermentation tank is 0.2 to 3 times the volume of the first fermentation tank per day; The reaction in the second fermentation tank is anaerobic fermentation; The temperature of the first fermentation tank is 20 to 60 ℃; The organic matter is fed into the first fermentation tank at least once a day. The solid content of the first fermenter is 15% to 25%.

2. The method of fermenting organic matter according to claim 1, wherein The first fermenter is not provided with a stirring component inside; And / or, the semi-permeable zone is further provided with a pipeline for discharging the low solid content material after separation from the semi-permeable zone; And / or, the semi-permeable material in the semi-permeable zone is cloth, stainless steel, plastic or ceramic.

3. The method of fermenting organic matter according to claim 1, wherein The first fermenter comprises a second outlet and a ninth outlet; the second outlet is a gas collection channel of the first fermenter; the ninth outlet is a fermentation product discharge channel of the first fermenter, used for discharging fermentation products from the first fermenter; And / or, the semi-permeable zone is a horizontal device; And / or, the semi-permeable zone comprises a back flushing system; the back flushing system is located at the upper part of the semi-permeable zone.

4. The fermentation method of organic matter according to claim 3, wherein, The second inlet is located at the lower part of the semi-permeable zone; the third outlet is located at the lower part of the semi-permeable zone and is higher than the second inlet; the fourth outlet is located at the upper part of the semi-permeable zone; the height of the third outlet from the bottom of the semi-permeable zone accounts for 15% or less of the height of the semi-permeable zone.

5. The fermentation method of organic matter according to claim 3 or 4, characterized in that, The first inlet and the fifth inlet of the first fermenter are the same inlet; And / or, the first inlet is located at the upper part of the first fermenter; And / or, the fifth inlet is located at the upper part of the first fermenter; And / or, the first outlet is located at the lower part of the first fermenter; And / or, the second outlet is located at the upper part of the first fermenter; And / or, the ninth outlet is located at the lower part of the first fermenter.

6. The fermentation method of organic matter according to claim 3 or 4, characterized in that, The fermentation device comprises a fifth outlet, which is located between the fourth outlet and the first inlet and is a discharge channel for downstream fermentation products of the semi-permeable zone; And / or, the fermentation device comprises a heating system, which is located between the fourth outlet and the first inlet.

7. The method of fermenting organic matter according to claim 6, wherein The fourth outlet connects the semi-permeable zone to the flow rate adjusting device, the fifth outlet and the heating system in sequence; And / or, the fermentation device comprises a material introduction system, which is connected to the first inlet or the fifth inlet and is used for introducing fresh organic matter to be fermented into the fermentation device.

8. The method of fermenting organic matter according to claim 1, wherein The fermentation device comprises a second fermenter; the second fermenter comprises a third inlet, a sixth outlet, a seventh outlet, an eighth outlet, a low solid content material input pipeline and a second fermenter material output pipeline; one end of the low solid content material input pipeline is connected to the semi-permeable zone and the other end is connected to the third inlet, which is used for transporting the low solid content material to the second fermenter; the first fermenter comprises a fourth inlet; one end of the second fermenter material output pipeline is connected to the sixth outlet and the other end is connected to the fourth inlet, which is used for transporting part of the material in the second fermenter back to the first fermenter; the seventh outlet is used for discharging the remaining material in the second fermenter from the second fermenter; The eighth outlet is a gas collection channel of the second fermenter.

9. The method of fermenting organic matter according to claim 8, wherein, The third inlet is located at the lower part of the second fermentation tank; the fourth inlet is located at the upper part of the first fermentation tank; the sixth outlet is located at the upper part of the second fermentation tank; the seventh outlet is located at the upper part of the second fermentation tank; and the eighth outlet is located at the upper part of the second fermentation tank.

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