Anaerobic fermentation reactor and fermentation system

Abstract

The utility model relates to the technical field of fermentation, in particular to an anaerobic fermentation reactor and a fermentation system, a tank body of the anaerobic fermentation reactor is provided with a vertical shaft type stirrer and an inclined shaft type stirrer, the vertical shaft type stirrer is vertically fixed on the top of the tank body in a penetrating manner, and the inclined shaft type stirrer is fixed on the side wall of the tank body in a penetrating manner; and an inclined angle is kept between the side wall of the tank body. The vertical shaft type stirrer and the inclined shaft type stirrer respectively generate stirring forces in different areas, so that the stirring efficiency of materials in the tank body can be improved, the stirring range is enlarged, dead angles are not easy to form, and the materials cannot be accumulated at the bottom of the tank body. The improved stirring efficiency of materials in the tank body can be suitable for fermentation raw materials with higher concentration, the treatment efficiency can be suitable for feeding concentration as high as 16%, the concentration range of semi-dry fermentation is reached, under the same volume, excessive water does not need to be blended, the generated fermentation biogas slurry is less, and compared with a traditional CSTR reactor, the construction cost is reduced, the sewage treatment load is reduced, and the production cost is reduced. And the volume gas production rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of fermentation, in particular to an anaerobic fermentation reactor and a fermentation system. Background Art

[0002] Anaerobic fermentation has a long history, and a wide variety of anaerobic reactors have been developed over the years. The most popular processes include dry and wet fermentation. For anaerobic reactors treating high-concentration organic matter, dry fermentation technology is not yet mature, and wet fermentation is currently the primary method. The fully mixed anaerobic wet reactor (CSTR) is the primary equipment for anaerobic fermentation of high-concentration organic matter. Equipped with a mechanical agitator, the CSTR offers high throughput, ease of management, and simple startup. It is suitable for the anaerobic treatment of agricultural organic waste and enjoys a wide range of applications.

[0003] Conventional CSTR mechanical stirring equipment mostly uses vertical mixers for stirring. The stirring range of the mixer is insufficient, and it is easy to form stirring dead corners in the reactor, which easily causes material accumulation at the bottom of the reactor. Therefore, the total solid concentration (TS) of the feed treated by the conventional CSTR fermentation system is less than 10%. Since the TS concentration of the raw materials treated by the CSTR fermentation system is low, a large amount of water is required to adjust the TS concentration, and a large amount of fermentation slurry is produced, resulting in a larger volume required for the CSTR reactor, increased construction costs, and increased sewage treatment load. At the same time, the volumetric gas production rate of the fermentation system is also relatively low. Utility Model Content

[0004] The utility model provides an anaerobic fermentation reactor and a fermentation system, which are used to solve the defects of a conventional CSTR fermentation system, such as large reactor volume, high construction cost and large sewage treatment load, caused by low feed TS concentration.

[0005] The utility model provides an anaerobic fermentation reactor, comprising a tank body, wherein the tank body is provided with a combined stirring mechanism, wherein the combined stirring mechanism comprises a vertical shaft mixer and an oblique shaft mixer, wherein the vertical shaft mixer is vertically penetrated and fixed on the top of the tank body, and the oblique shaft mixer is penetrated and fixed on the side wall of the tank body and maintains an inclined angle with the side wall of the tank body.

[0006] According to an anaerobic fermentation reactor provided by the utility model, a fixed pile is provided at the bottom of the tank body, the inclined axis mixer is obliquely inserted through the side wall of the tank body, and the end of the inclined axis mixer located in the tank body is rotatably connected to the fixed pile.

[0007] According to an anaerobic fermentation reactor provided by the utility model, a plurality of the inclined-axis mixers are provided, and the plurality of the inclined-axis mixers are evenly distributed along the circumference of the side wall of the tank body, and each of the inclined-axis mixers is connected to a corresponding fixed pile.

[0008] According to an anaerobic fermentation reactor provided by the utility model, a scraper is mounted on the vertical shaft of the vertical shaft mixer, and the scraper is suitable for rotating along with the vertical shaft of the vertical shaft mixer.

[0009] According to an anaerobic fermentation reactor provided by the utility model, the scraper is movably sleeved on the vertical shaft of the vertical shaft mixer, and an axial guide and a circumferential limiter are provided between the scraper and the vertical shaft of the vertical shaft mixer. The axial guide is used to enable the scraper to move along the axial direction of the vertical shaft on the vertical shaft of the vertical shaft mixer, and the circumferential limiter is used to circumferentially limit the scraper relative to the vertical shaft of the vertical shaft mixer.

[0010] According to an anaerobic fermentation reactor provided by the utility model, a heating coil is fixed on the inner wall of the tank body, and the heating coil is arranged in a coiled manner along the inner wall of the tank body.

[0011] The utility model also provides a fermentation system, comprising a mixing tank, a discharge tank and the anaerobic fermentation reactor described in any one of the above items, wherein the anaerobic fermentation reactor is provided with a feed port, a discharge port and a biogas outlet, the mixing tank is connected to the feed port of the anaerobic fermentation reactor through a pipeline, the discharge port of the anaerobic fermentation reactor is connected to the discharge tank through a pipeline, a feed screw pump is provided in the pipeline connecting the mixing tank and the anaerobic fermentation reactor, and a discharge screw pump is provided in the pipeline connecting the anaerobic fermentation reactor and the discharge tank.

[0012] According to a fermentation system provided by the present invention, there are at least two anaerobic fermentation reactors, and all of the anaerobic fermentation reactors are respectively connected to the mixing tank and the discharge tank.

[0013] According to a fermentation system provided by the present invention, the discharge tank is further connected to the mixing tank through a branch line; the feed port and the discharge port of the anaerobic fermentation reactor are both provided with valves.

[0014] According to a fermentation system provided by the present invention, the feed screw pump between the mixing tank and the anaerobic fermentation reactor and the discharge screw pump between the anaerobic fermentation reactor and the discharge tank are both provided with a backup pump in parallel.

[0015] The utility model provides an anaerobic fermentation reactor and fermentation system. The anaerobic fermentation reactor stirs the material in the tank through a combined stirring mechanism, so that the material can be fully mixed and fermented. The vertical shaft mixer and the inclined shaft mixer respectively generate stirring forces in different areas, which can improve the stirring efficiency of the material in the tank. Not only does the stirring range increase, but also the corners in the tank can be stirred, which is not easy to form dead corners and will not cause the accumulation of materials at the bottom of the tank. The improved stirring efficiency of the material in the tank can be applied to fermentation raw materials with higher concentrations. Its processing efficiency can be applied to feed concentrations as high as 16%, reaching the concentration range of semi-dry fermentation. It is applicable to a wider range of fermentation raw materials and can process various types of fibrous materials, as well as livestock manure, kitchen wastewater, food waste, etc. Under the same volume, there is no need to allocate too much water, and the fermentation liquid produced is less. Compared with the traditional CSTR reactor, the construction cost is reduced, the sewage treatment load is reduced, and the volumetric gas production rate is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the anaerobic fermentation reactor provided by the utility model.

[0018] Figure 2 It is a schematic flow chart of the fermentation system provided by the present invention.

[0019] Figure numerals: 1. tank body; 2. vertical-shaft mixer; 3. inclined-shaft mixer; 4. fixed pile; 5. scraper; 6. heating coil; 7. mixing tank; 8. discharge tank; 9. anaerobic fermentation reactor; 10. feed screw pump; 11. discharge screw pump. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0023] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0025] The following combination Figure 1 and Figure 2 The specific structure and working principle of the anaerobic fermentation reactor and fermentation system of the present invention are described.

[0026] One embodiment of the present invention provides an anaerobic fermentation reactor. Figure 1 As shown, it includes a tank body 1, and the tank body 1 is provided with a combined stirring mechanism, which includes a vertical shaft mixer 2 and an oblique shaft mixer 3. The vertical shaft mixer 2 is vertically penetrated and fixed on the top of the tank body 1, and the oblique shaft mixer 3 is penetrated and fixed on the side wall of the tank body 1, and maintains an inclined angle with the side wall of the tank body 1.

[0027] It is understandable that the anaerobic fermentation reactor in this embodiment stirs the material in the tank body 1 through a combined stirring mechanism, so that the material can be fully mixed and fermented. The vertical shaft mixer 2 and the inclined shaft mixer 3 respectively generate stirring forces in different areas, which can improve the stirring efficiency of the material in the tank body 1. Not only does the stirring range increase, but also the corners in the tank body 1 can be stirred, and dead corners are not easily formed, and the material will not accumulate at the bottom of the tank body 1. The improved stirring efficiency of the material in the tank body 1 can be applied to fermentation raw materials with higher concentrations. Its processing efficiency can be applied to feed concentrations as high as 16%, reaching the concentration range of semi-dry fermentation. The applicable fermentation raw materials are wider, and various types of fibrous materials can be processed, as well as livestock manure, kitchen wastewater, food waste, etc. Under the same volume, there is no need to allocate too much water, and the fermentation liquid produced is less. Compared with the traditional CSTR reactor, the construction cost is reduced, the sewage treatment load is reduced, and the volumetric gas production rate is higher.

[0028] In some embodiments of the anaerobic fermentation reactor of the present invention, the tank body 1 is a circular tank body with an arc-shaped top cover. The tank body 1 has a size of φ29.0×8.4mm and is made of carbon steel welded structure. A fixed pile 4 is set at the bottom of the tank body 1. The inclined axis mixer 3 is inserted obliquely through the side wall of the tank body 1, and the end of the inclined axis mixer 3 located inside the tank body 1 is rotatably connected to the fixed pile 4. Figure 1 As shown, the side wall of the tank body 1 is reserved for installing a sleeve and a flange for installing the inclined-axis mixer 3. The inner end of the inclined-axis mixer 3 is rotatably connected to the fixed pile 4. The fixed pile 4 and the side wall of the tank body 1 support the inclined-axis mixer 3 to ensure normal rotation and stirring of the inclined-axis mixer 3.

[0029] In other embodiments of the anaerobic fermentation reactor of the present invention, a plurality of inclined-axis mixers 3 are provided, and the plurality of inclined-axis mixers 3 are evenly distributed along the circumference of the side wall of the tank body 1, and each inclined-axis mixer 3 is connected to a corresponding fixed pile 4. It is understandable that in this embodiment, a vertical-axis mixer 2 is provided at the top center of the tank body 1, and a plurality of inclined-axis mixers 3 are evenly distributed on the side wall of the tank body 1 with the vertical-axis mixer 2 as the center. The vertical-axis mixer 2 and the plurality of inclined-axis mixers 3 can operate independently, and the vertical-axis mixer 2 and the inclined-axis mixer 3 form a joint stirring, and the stirring power is higher than that of a conventional dilute material fermentation system, and is used to fully mix the high-concentration materials and microorganisms in the reactor, ensure uniform stirring without dead angles in the tank, and effectively promote the exchange of substances and energy. If used for the fermentation of dilute materials, the stirring system can reduce the number or operation time of the inclined-axis mixers 3 as appropriate.

[0030] Furthermore, a scraper 5 is mounted on the vertical shaft of the vertical mixer 2 and is adapted to rotate with the vertical shaft of the vertical mixer 2. As the scraper 5 rotates with the vertical mixer 2, it removes scum and prevents the formation of a crust on the top of the straw in the tank. In some specific examples, the scraper 5 is movably mounted on the vertical shaft of the vertical mixer 2, with an axial guide and a circumferential stopper disposed between the scraper 5 and the vertical shaft of the vertical mixer 2. The axial guide is used to enable the scraper 5 to move axially along the vertical shaft of the vertical mixer 2, and the circumferential stopper is used to circumferentially limit the scraper 5 relative to the vertical shaft of the vertical mixer 2.

[0031] It is understood that the circumferential limiter can be a flat key disposed in a keyway on the vertical shaft of the vertical shaft mixer 2. This keyed connection allows the scraper 5 to rotate circumferentially along the vertical shaft of the vertical shaft mixer 2. The axial guide can be a slider. A slide groove is disposed axially on the vertical shaft of the vertical shaft mixer 2. The slider and the slide groove cooperate to enable the scraper 5 to move axially along the vertical shaft, enabling the scraper 5 to be adjusted in height and direction, allowing it to be used at different fermentation liquid levels, thereby better preventing crusting on the top of the straw in the tank.

[0032] In some embodiments of the anaerobic fermentation reactor of the present invention, a heating coil 6 is fixed to the inner wall of the tank body 1 and is arranged along the inner wall of the tank body 1. The heating coil 6 can be a carbon steel coil with a diameter of 80 mm. The heating coil 6 heats the material inside the tank body 1 through an external heat exchange unit. The heating target temperature can generally be set to 42°C.

[0033] The present invention also provides a fermentation system. In some embodiments, see Figure 2As shown, the fermentation system of the present invention includes a mixing tank 7, a discharge tank 8 and an anaerobic fermentation reactor 9 of any one of the above items. The anaerobic fermentation reactor 9 is provided with a feed port, a discharge port and a biogas outlet. The mixing tank 7 is connected to the feed port of the anaerobic fermentation reactor 9 through a pipeline, and the discharge port of the anaerobic fermentation reactor 9 is connected to the discharge tank 8 through a pipeline. A feed screw pump 10 is provided in the pipeline connecting the mixing tank 7 and the anaerobic fermentation reactor 9, and a discharge screw pump 11 is provided in the pipeline connecting the anaerobic fermentation reactor 9 and the discharge tank 8.

[0034] It is understood that the fermentation system of this embodiment includes the anaerobic fermentation reactor 9 of the above-mentioned embodiment, and thus the fermentation system of this embodiment also possesses the corresponding functions of the anaerobic fermentation reactor 9. After the materials are mixed in the mixing tank 7, they are fed to the anaerobic fermentation reactor 9 via a feed screw pump 10. The anaerobic fermentation reactor 9 is fed at the bottom and discharged from the middle and lower parts. At the discharge port, the fermented liquid is transported to the discharge tank 8 via a discharge screw pump 11, and then enters the back-end processing system. A vertical shaft mixer 2 with a scraper 5 is installed in the center of the anaerobic fermentation reactor 9, and four inclined shaft mixers 3 are installed on the side walls of the tank body 1. The combined stirring mode of these two types of mixers provides a higher stirring power than conventional dilute material fermentation systems, which is used to thoroughly mix the high-concentration materials and microorganisms in the reactor, ensuring uniform stirring without dead corners in the tank, effectively promoting the exchange of substances and energy. At the same time, the scraper 5 prevents the formation of crust on the top of the straw in the tank, ensuring the long-term stable operation of the anaerobic fermentation tank. The fermentation system of this embodiment can be equipped with a stirring system mainly for high-concentration materials. If it is used for the fermentation of dilute materials, the stirring system can be operated for a reduced number of units or time depending on the situation. A heating coil 6 is provided in the tank body 1 to heat the material to the temperature of medium-temperature fermentation. The fermented liquid is connected to the discharge screw pump 11 through the discharge port reserved in the tank wall and transported to the back-end processing system.

[0035] In some embodiments of the fermentation system of the present invention, there are at least two anaerobic fermentation reactors 9, and all anaerobic fermentation reactors 9 are respectively connected to the mixing tank 7 and the discharge tank 8. The discharge tank 8 is also connected to the mixing tank 7 through a branch line; the feed port and the discharge port of the anaerobic fermentation reactor 9 are both provided with valves.

[0036] It is understood that, taking the example of setting up two anaerobic fermentation reactors 9, the two anaerobic fermentation reactors 9 in this embodiment are respectively provided with feed ports and discharge ports and connected with pipelines, so that the two anaerobic fermentation reactors 9 can be fed and discharged independently, and the two anaerobic fermentation reactors 9 can be operated in parallel in a single stage. On this basis, a branch pipeline is set between the discharge tank 8 and the mixing tank 7, and each device is provided with an inlet and outlet valve. By adding a set of pipeline valve electrical controllers to control the opening and closing of each valve and the flow direction of the fermentation liquid in the pipeline, the two anaerobic fermentation reactors 9 can be fed into each other.

[0037] Specifically, during the operation of the fermentation system of this embodiment, the two anaerobic fermentation reactors 9 are arranged in parallel, and anaerobic fermentation can be carried out independently and simultaneously. When the two anaerobic fermentation reactors 9 need to be overhauled, the two anaerobic fermentation reactors 9 can be overhauled separately, and at this time, the material needs to be poured between the two anaerobic fermentation reactors 9. When the first anaerobic fermentation reactor 9 is overhauled, the discharge port of the first anaerobic fermentation reactor 9 is opened, and the feed port is closed. The material enters the discharge tank 8 from the discharge port of the first anaerobic fermentation reactor 9 through the discharge screw pump 11, and then flows back into the mixing tank 7 through the branch line between the discharge tank 8 and the mixing tank 7. At this time, the feed port of the second anaerobic fermentation reactor 9 is opened, and the discharge port is closed. The fermentation liquid refluxed in the mixing tank 7 enters the second anaerobic fermentation reactor 9 through the feed screw pump 10, completing the pouring of the material in the first anaerobic fermentation reactor 9 into the second anaerobic fermentation reactor 9. Similarly, referring to the above process, the material in the second anaerobic fermentation reactor 9 can also be poured into the first anaerobic fermentation reactor 9 to perform maintenance on the second anaerobic fermentation reactor 9. When the two anaerobic fermentation reactors 9 are to be maintained, the material can be poured between the two anaerobic fermentation reactors 9. While one anaerobic fermentation reactor 9 is being maintained, the other anaerobic fermentation reactor 9 can operate normally, thus achieving maintenance without stopping the machine.

[0038] It should be understood that the above embodiment introduces the mutual feeding of materials between two anaerobic fermentation reactors 9. The number of anaerobic fermentation reactors 9 of the present invention can be set to more than two, and can be increased or decreased according to actual needs.

[0039] The fermentation tank outlet is connected to two sets of screw pumps, one of which is a spare pump. The discharge pipes of each fermentation tank converge at the feed port of the discharge screw pump. The discharge screw pump is then connected to a branch pipe to the mixing tank. The feed pump of the mixing tank then transports the material discharged from the fermentation tank to another fermentation tank, completing the material transfer between the two fermentation tanks.

[0040] In other embodiments of the fermentation system of the present invention, the feed screw pump 10 between the mixing tank 7 and the anaerobic fermentation reactor 9 and the discharge screw pump 11 between the anaerobic fermentation reactor 9 and the discharge tank 8 are both set in parallel as two sets, one of which works normally and the other is used as a backup pump.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An anaerobic fermentation reactor, comprising a tank body (1), characterized in that: The tank body (1) is provided with a combined stirring mechanism, which comprises a vertical shaft mixer (2) and an oblique shaft mixer (3); the vertical shaft mixer (2) is vertically penetrated and fixed on the top of the tank body (1); the oblique shaft mixer (3) is penetrated and fixed on the side wall of the tank body (1) and maintains an inclined angle with the side wall of the tank body (1).

2. The anaerobic fermentation reactor according to claim 1, characterized in that A fixing pile (4) is provided at the bottom of the tank body (1), the inclined-axis mixer (3) is obliquely inserted through the side wall of the tank body (1), and the end of the inclined-axis mixer (3) located inside the tank body (1) is rotatably connected to the fixing pile (4).

3. The anaerobic fermentation reactor according to claim 2, characterized in that A plurality of the inclined-axis mixers (3) are provided, and the plurality of the inclined-axis mixers (3) are evenly distributed along the circumference of the side wall of the tank body (1), and each of the inclined-axis mixers (3) is connected to a corresponding fixed pile (4).

4. The anaerobic fermentation reactor according to any one of claims 1 to 3, characterized in that: A scraper (5) is mounted on the vertical shaft of the vertical shaft mixer (2), and the scraper (5) is suitable for rotating along with the vertical shaft of the vertical shaft mixer (2).

5. The anaerobic fermentation reactor according to claim 4, characterized in that: The scraper (5) is movably sleeved on the vertical shaft of the vertical shaft mixer (2); an axial guide and a circumferential limiter are provided between the scraper (5) and the vertical shaft of the vertical shaft mixer (2); the axial guide is used to enable the scraper (5) to move along the axial direction of the vertical shaft on the vertical shaft of the vertical shaft mixer (2); and the circumferential limiter is used to limit the scraper (5) circumferentially relative to the vertical shaft of the vertical shaft mixer (2).

6. The anaerobic fermentation reactor according to any one of claims 1 to 3, characterized in that: A heating coil (6) is fixed on the inner wall of the tank body (1), and the heating coil (6) is arranged in a coiled manner along the inner wall of the tank body (1).

7. A fermentation system, characterized in that: The invention comprises a mixing tank (7), a discharge tank (8) and an anaerobic fermentation reactor (9) according to any one of claims 1 to 6, wherein the anaerobic fermentation reactor (9) is provided with a feed port, a discharge port and a biogas outlet, the mixing tank (7) is connected to the feed port of the anaerobic fermentation reactor (9) through a pipeline, the discharge port of the anaerobic fermentation reactor (9) is connected to the discharge tank (8) through a pipeline, a feed screw pump (10) is provided in the pipeline connecting the mixing tank (7) and the anaerobic fermentation reactor (9), and a discharge screw pump (11) is provided in the pipeline connecting the anaerobic fermentation reactor (9) and the discharge tank (8).

8. The fermentation system according to claim 7, characterized in that There are at least two anaerobic fermentation reactors (9), and all of the anaerobic fermentation reactors (9) are respectively connected to the mixing tank (7) and the discharge tank (8).

9. The fermentation system according to claim 8, characterized in that The discharge tank (8) is also connected to the mixing tank (7) via a branch line; the feed port and the discharge port of the anaerobic fermentation reactor (9) are both provided with valves.

10. The fermentation system according to claim 7, characterized in that The feed screw pump (10) between the mixing tank (7) and the anaerobic fermentation reactor (9) and the discharge screw pump (11) between the anaerobic fermentation reactor (9) and the discharge tank (8) are both provided with standby pumps in parallel.

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