Anaerobic digestion reactor and method of use

Abstract

This invention provides an anaerobic digestion reactor and its usage method. The reactor consists of a lid, a tank body, and a bottom. The lid has an exhaust port connected to an exhaust pipe, and an exhaust valve is installed on the exhaust port. The exhaust pipe is connected to an external gas collection system. An inlet is installed on the lid, and an inlet valve is installed on the inlet, which is connected to an external feeding device. A geared motor is installed in the center of the lid, located outside the lid, and is connected to a drive shaft via a coupling. This anaerobic digestion reactor is suitable for the anaerobic digestion treatment of organic waste with different dry matter contents, achieving a maximum anaerobic digestion concentration of 30%. It ensures rapid degradation of organic waste and stable reactor operation at different anaerobic digestion concentrations. This invention not only achieves innovation in the process route but also significantly improves treatment efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of fermentation equipment, and in particular relates to an anaerobic digestion reactor and a use method thereof. Background Art

[0002] Anaerobic digestion is the most environmentally friendly treatment technology for solid wastes such as crop straw, livestock manure, urban sludge, restaurant kitchen waste, and organic household waste. Through anaerobic digestion, solid organic waste can be "reduced, harmless, and resourced."

[0003] Although dry anaerobic digestion has the advantages of low construction and operation costs, simple pre- and post-treatment processes, and high efficiency, wet anaerobic digestion is still the main process currently used, mainly because the wet anaerobic digestion process is mature and has supporting equipment; and due to equipment constraints, dry anaerobic digestion projects mainly use sequencing batch processes, and there are few continuous dry anaerobic digestion projects that operate continuously. Foreign continuous dry anaerobic digestion reactors generally use horizontal tank processes, and the stirring shaft that runs across the reactor is the core component of the process. It has not yet been domestically produced in China, and the introduction price is high, so reactors of this process type are rarely used in China.

[0004] 201610881366.3 discloses a vertical continuous anaerobic dry fermentation method, which adopts a vertical reaction process, eliminates the stirring device, and realizes the discharge of raw materials by gravity, and adopts pre-inoculation and spraying technology to improve the efficiency of anaerobic digestion; 201811411691.9 discloses a paddle vertical semi-continuous anaerobic digestion reactor, which also adopts a vertical reaction process and is equipped with a vertical stirring shaft to stir the raw materials. However, the above reactor only realizes the continuous operation of dry anaerobic digestion, and fails to achieve the treatment of organic waste. Summary of the invention

[0005] The purpose of the present invention is to solve the defects of the above-mentioned prior art and provide an anaerobic digestion reactor and a method of use, which can achieve the harmlessness and energy recovery of solid organic waste at low cost and quickly.

[0006] The present invention adopts the following technical solution:

[0007] A method for using an anaerobic digestion reactor comprises the following steps:

[0008] (1) The fermentation raw materials are pretreated, and the particle size of the raw materials after pretreatment should be less than 5 mm.

[0009] The pretreatment methods mainly include crushing, breaking, shearing and the like.

[0010] (2) pre-inoculating the fermentation raw material obtained in (1);

[0011] (3) adding the fermentation raw material obtained in (2) into an anaerobic digestion reactor and sealing the anaerobic digestion reactor;

[0012] (4) Turn on the automatic controller to increase / maintain temperature to ensure that the fermentation temperature in the anaerobic digestion reactor reaches the set value;

[0013] (5) setting the operating value of the raw material reduction motor according to the expansion law of the fermentation raw material and starting the automatic controller to control the movement of the reduction motor;

[0014] (6) Set the feed and discharge rates according to the gas production rules of the fermentation raw materials, and feed and discharge the materials regularly according to the set values.

[0015] As a preferred technical solution of the present invention, in (2), the number of methanogenic bacteria cells in the inoculum selected for pre-inoculation is not less than 1×10 8 / g, the total number of microbial cells is not less than 1×10 9 The solid content of the inoculum is not less than 18%, the inoculum amount (the mass ratio of the inoculum to the raw material) is not less than 10%, and the solid content of the fermentation raw material after inoculation is not higher than 30%.

[0016] As a preferred technical solution of the present invention, the maximum feed amount in (3) does not exceed 75% of the volume of the anaerobic digestion reactor.

[0017] As a preferred technical solution of the present invention, in (5), the frequency, cycle and interval time of the reduction motor are set according to the fermentation raw materials, and the interval time is generally set to ≤12 times / day, the cycle ≤5 minutes / time, and the frequency ≤30 rpm; the maximum speed of the transmission shaft is less than or equal to 30 rpm; the number of tightening rods on the transmission shaft is ≤5 groups, the width / thickness of the tightening rods is ≤1cm, and the ratio of the length to the diameter of the tank body is 0.85-0.95:1.

[0018] As a preferred technical solution of the present invention, in (6), the discharging cycle and the feed rate / discharging rate are set according to different fermentation raw materials, but the residence time of the material in the tank is ≥ 20 days.

[0019] An anaerobic digestion reactor consists of a tank cover, a tank body and a tank bottom.

[0020] The tank cover is provided with an exhaust port, which is connected to an exhaust pipe, an exhaust valve is installed on the exhaust port, and the exhaust pipe is connected to an external gas collection system. A feed port is installed on the tank cover, and a feed valve is installed on the feed port, and the feed port is connected to an external feed device. A reduction motor is installed in the middle of the tank cover, and the reduction motor is located outside the tank cover. The reduction motor is connected to the transmission shaft through a coupling, and a sealing component is installed at the connection between the reduction motor transmission shaft and the tank cover to ensure the airtightness of the reactor. The upper part of the tank body is connected to the tank cover, and the lower part is connected to the tank bottom. The tank body is wrapped with an insulation layer. Tightening rods are installed on the transmission shaft in the tank body and the tank bottom, and are installed at equal intervals from top to bottom. A connecting rod and a discharging scraper are installed at the end of the transmission shaft.

[0021] The reduction motor is automatically controlled by an automatic controller. A discharge port is installed at the center of the bottom of the tank, a discharge valve is installed on the discharge port, and the discharge port is connected to an external discharge device.

[0022] As a preferred technical solution of the present invention, a bracket is also installed at the bottom of the tank bottom for supporting and fixing the anaerobic digestion reactor.

[0023] As a preferred technical solution of the present invention, the tank body is cylindrical with a height-to-diameter ratio of ≥2.5:1, and the heating facility adopts an in-pipe heating method or a tank wall heating method. When the tank wall heating method is selected, a jacket is installed on the outside of the tank body, and hot water is passed through the jacket. In this way, the tank body is heated by circulating hot water, and the temperature adjustment is achieved by an automatic controller.

[0024] As a preferred technical solution of the present invention, the tank bottom is in the shape of a truncated cone with a taper of ≤1, the tank bottom is connected to the tank body with equal diameter, and the lower bottom of the tank bottom is connected to the discharge port.

[0025] As a preferred technical solution of the present invention, a tightening rod is installed on the transmission shaft in the tank body, the number of tightening rods in the tank body does not exceed 5 groups, the width / thickness of the tightening rod is ≤1cm, and the tightening rod is installed on the transmission shaft in an umbrella shape with the transmission shaft as the center.

[0026] As a preferred technical solution of the present invention, a discharging scraper is installed in the bottom of the tank, the number of the discharging scraper is 2-3 pieces, the discharging scraper is installed on a connecting rod, the connecting rod is installed at the end of the transmission shaft, the angle between the discharging scraper and the vertical direction is 60-85°, and the transmission shaft is evenly spaced upward with tightening rods arranged in an umbrella shape along the transmission shaft as the axis.

[0027] Beneficial effects of the present invention:

[0028] The present invention designs a reactor according to the law of dry anaerobic digestion of solid organic waste. The reactor body is cylindrical, has a solid structure, a long service life, no fermentation dead zone, and high utilization rate.

[0029] The reactor adopts a vertical structure, with fermentation raw materials entering from the top and exiting from the bottom. The raw materials are pushed forward by gravity, reducing power consumption. The stirring facilities are eliminated, and the raw materials automatically form functional partitions of "hydrolysis, acidification, and methanogenesis" in the tank, thereby improving the efficiency of anaerobic digestion.

[0030] The additional compacting rod and the timed compacting operation of raw materials can ensure the full contact between the fermentation raw materials and the functional microorganisms without destroying the functional zoning, further improving the efficiency of anaerobic digestion.

[0031] The tank bottom is designed to be a truncated cone, and the tank bottom is connected to the tank body at a certain angle, which ensures the natural flow of fermentation raw materials and saves building space and costs. The tank bottom is equipped with a discharge scraper, and the discharge scraper is inclined at a certain angle to the discharge port, pushing the raw materials to flow to the discharge port, avoiding the "arching" phenomenon and blockage of the raw materials, and solving the problem of high-concentration anaerobic digestion discharge.

[0032] The degradation efficiency of solid organic waste can be improved by pretreatment such as crushing, breaking or shearing; one or more pretreated solid organic waste raw materials are selected according to the growth law and nutritional requirements of functional microorganisms to be adjusted to a certain fermentation concentration, and then inoculated with inoculants containing high activity and quantity of functional microorganisms, which can greatly improve the success rate of anaerobic digestion startup and shorten the startup cycle; keeping anaerobic digestion under constant temperature conditions can meet the growth requirements of functional microorganisms to ensure that anaerobic digestion operates in a stable state; sufficient fermentation raw material residence period can ensure the degradation efficiency and removal rate of the raw materials, so as to achieve the purpose of maximizing harmlessness and resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of the anaerobic digestion reactor used in the present invention (the heat preservation method adopts the jacket hot water heat preservation mode);

[0034] In the figure: 1-tank cover, 2-tank body, 3-tank bottom, 4-exhaust pipe, 5-exhaust valve, 6-feeding port, 7-feeding valve, 8-reduction motor, 9-drive shaft, 10-sealing assembly, 11-compacting rod, 12-discharging scraper, 13-automatic controller, 14-jacket, 15-insulation layer, 16-discharging port, 17-discharging valve, 18-bracket, 19-connecting rod. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the following is a clear and complete description in combination with the technical solution in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1 As shown, the anaerobic digestion reactor of the present invention is composed of a tank cover 1, a tank body 2 and a tank bottom 3.

[0037] The tank cover 1 is provided with an exhaust port, the exhaust port is connected to an exhaust pipe, an exhaust valve 5 is installed on the exhaust port, and the exhaust pipe 4 is connected to an external gas collection system;

[0038] The tank cover 1 is provided with a feed port 6, a feed valve 7 is provided on the feed port, and the feed port 6 is connected to an external feed device;

[0039] A reduction motor 8 is installed in the middle of the tank cover 1, and the reduction motor 8 is located outside the tank cover 1. The reduction motor 8 is connected to the transmission shaft 9 through a coupling. A sealing component 10 (mechanical sealing component ( Figure 1 The mechanical seal assembly shown in the figure) or the water seal assembly) is used to ensure the airtightness of the reactor.

[0040] The upper part of the tank body 2 is connected to the tank cover 1, and the lower part is connected to the tank bottom 3. The tank body 1 is wrapped with an insulation layer 15. Tightening rods 11 are installed on the transmission shaft 9 in the tank body 2 and the tank bottom 3 at equal intervals from top to bottom. The end of the transmission shaft is installed with a connecting rod 19 and a discharge scraper 12.

[0041] The reduction motor 8 is automatically controlled by an automatic controller 13 . A discharge port 16 is installed at the center of the bottom of the tank bottom 3 . A discharge valve 17 is installed on the discharge port 16 . The discharge port 16 is connected to an external discharge device.

[0042] As a preferred technical solution of the present invention, a bracket 18 is also installed at the bottom of the tank bottom 3 for supporting and fixing the anaerobic digestion reactor.

[0043] As a preferred technical solution of the present invention, the tank body 2 is cylindrical with a height-to-diameter ratio of ≥2.5:1. The heating facility adopts an in-pipe heating method or a tank wall heating method. When the tank wall heating is selected, a jacket 14 is installed on the outside of the tank body 2, and hot water is passed through the jacket 14. There is a hot water outlet at the top of the jacket 14 and a hot water inlet at the bottom of the jacket 14. In this way, the tank body 2 is heated by hot water circulation. The temperature control is that the automatic controller 13 controls the hot water circulation, thereby realizing automatic control of the constant temperature of the tank body 2.

[0044] As a preferred technical solution of the present invention, the tank bottom 3 is in the shape of a truncated cone with a taper of ≤1, the upper bottom of the tank bottom 3 is connected to the tank body 2 with equal diameter, and the lower bottom of the tank bottom 3 is connected to the discharge port 16.

[0045] As a preferred technical solution of the present invention, a tightening rod 11 is installed on the transmission shaft 9 inside the tank body 2, the number of tightening rods 11 inside the tank body 2 does not exceed 5 groups, the width / thickness of the tightening rod ≤1cm, and the tightening rod 11 is installed on the transmission shaft 9 in an umbrella shape with the transmission shaft 9 as the center.

[0046] As a preferred technical solution of the present invention, a discharging scraper 12 is installed in the bottom of the tank. The number of the discharging scrapers is 2-3. The discharging scraper is installed on a connecting rod 19. The connecting rod 19 is installed at the end of the transmission shaft. The angle between the discharging scraper and the vertical direction is 60-85°. The transmission shaft is evenly spaced upward with tightening rods 11 arranged in an umbrella shape along the transmission shaft as the axis.

[0047] At the same time, a method for using an anaerobic digestion reactor is provided, comprising the following steps:

[0048] (1) The fermentation raw materials are pretreated, and the particle size of the raw materials after pretreatment should be less than 5 mm.

[0049] The pretreatment methods mainly include crushing, breaking, shearing and the like.

[0050] (2) pre-inoculating the fermentation raw material obtained in (1);

[0051] (3) adding the fermentation raw material obtained in (2) into an anaerobic digestion reactor and sealing the anaerobic digestion reactor;

[0052] (4) Turn on the automatic controller to increase / maintain temperature to ensure that the fermentation temperature in the anaerobic digestion reactor reaches the set value;

[0053] (5) setting the operating value of the raw material reduction motor according to the expansion law of the fermentation raw material and starting the automatic controller to control the movement of the reduction motor;

[0054] (6) Set the feed and discharge rates according to the gas production rules of the fermentation raw materials, and feed and discharge the materials regularly according to the set values.

[0055] As a preferred technical solution of the present invention, in (2), the number of methanogenic bacteria cells in the inoculum selected for pre-inoculation is not less than 1×10 8 / g, the total number of microbial cells is not less than 1×10 9 The solid content of the inoculum is not less than 18%, the inoculum amount (the mass ratio of the inoculum to the raw material) is not less than 10%, and the solid content of the fermentation raw material after inoculation is not higher than 30%.

[0056] As a preferred technical solution of the present invention, the maximum feed amount in (3) does not exceed 75% of the volume of the anaerobic digestion reactor.

[0057] As a preferred technical solution of the present invention, in (5), the frequency, cycle and interval time of the reduction motor are set according to the fermentation raw materials, and the interval time is generally set to ≤12 times / day, the cycle ≤5 minutes / time, and the frequency ≤30 rpm; the maximum speed of the transmission shaft is less than or equal to 30 rpm; the tightening rods are distributed on the transmission shaft in an umbrella shape with the transmission shaft as the center, from top to bottom, the number of tightening rods on the transmission shaft is ≤5 groups, the width / thickness of the tightening rods is ≤1cm, and the ratio of length to tank diameter is 0.85-0.95:1.

[0058] As a preferred technical solution of the present invention, in (6), the discharging cycle and the feed rate / discharging rate are set according to different fermentation raw materials, but the residence time of the material in the tank is ≥ 20 days.

[0059] Example 1

[0060] Continuous anaerobic digestion is carried out using dry and clean pig manure from pig farms as raw material.

[0061] Add inoculum at a mass ratio of 10:1 and mix thoroughly; the solid content of the inoculum is 20%, of which the number of methanogen cells is 1.9×10 8 / g, the total number of microbial cells is not less than 1.2×10 9 The solid content of the raw material after inoculation is about 25.5%.

[0062] The diameter of the anaerobic digestion reactor tank is 48cm and the height is 120cm, of which the bottom of the tank is 10cm high and the diameter of the discharge port is 10cm. The total volume of the reactor is 216L. On the first day of anaerobic digestion startup, 81kg of raw materials were added, the temperature of the heating and insulation system was set to 35°C, and the raw material stirring operation parameters were set to 1 time / day, 5 minutes / time, and 30 rpm; from the 11th day, 8.1kg of raw materials were added every day but no material was discharged; but from the 21st day, normal material input and output began, with an input and output volume of about 8.1kg. The gas production was recorded every day during the operation, and samples were taken every 3 days to test the biogas gas composition and discharge VS. The anaerobic digestion reactor was operated for a total of 120 days, and the data after stable operation were taken for statistical analysis. The results are shown in the following table:

[0063] Statistics of anaerobic digestion results during stable operation

[0064]

[0065] According to the statistical results, we can see that:

[0066] 1. Stable operation of anaerobic digestion reactor: During the 100-day stable operation period, the organic load reached 7.2kgVS / (m 3·d), the anaerobic digestion reactor has been in a high-load operation state. The daily added raw materials stay in the tank for 20 days, ensuring the full degradation of the raw materials. Under this operating condition, the methane concentration in the biogas reaches 65.3%, the pH value is about 7.9, and all test indicators have only slight fluctuations. The anaerobic digestion reactor has been in a stable operation state.

[0067] 2. Operation of anaerobic digestion reactor: During the fermentation cycle, the raw gas production rate of this batch of pig manure is about 63.7m 3 / t, TS gas production rate is about 0.25m 3 / kg TS, accounting for 62.5% of the theoretical gas production value of fresh pig manure in 60 days; the average daily gas production reached 469L, and the volumetric gas production rate of the anaerobic digestion reactor was about 2.17m 3 / (m 3 ·d), which is higher than the data reported in most biogas projects and similar patents currently.

[0068] Example 2

[0069] Continuous anaerobic digestion was carried out using a mixture of dry chicken manure from a chicken farm and air-dried rice straw as raw material.

[0070] First, the air-dried rice straw is pre-treated by crushing, and the particle size is about 3 mm. Chicken manure, pre-treated straw and water are fully mixed in a mass ratio of 4:1:1 to obtain a mixed raw material.

[0071] Then add the inoculum at a mass ratio of 5:1 and mix thoroughly; the solid content of the inoculum is 18.5%, of which the number of methanogen cells is 1.3×10 8 / g, the total number of microbial cells is 1.1×10 9 The solid content of the raw material after inoculation was about 22.3%.

[0072] The diameter of the anaerobic digestion reactor tank is 48cm and the height is 120cm, of which the bottom of the tank is 10cm high and the diameter of the discharge port is 10cm. The total volume of the reactor is 216L. On the first day of anaerobic digestion startup, 81kg of raw materials were added, the temperature of the heating and insulation system was set to 37°C, and the raw material stirring operation parameters were set to 6 times / day, 5 minutes / time, and 25 rpm; from the 13th day, 6kg of raw materials were added every day but no material was discharged; from the 25th day, normal material input and output began, with an input and output volume of about 6kg. The gas production was recorded every day during the operation, and samples were taken every 3 days to test the biogas gas composition and discharge VS. The anaerobic digestion reactor was operated for a total of 150 days, and the data after stable operation were taken for statistical analysis. The results are shown in the following table:

[0073] Statistics of anaerobic digestion results during stable operation

[0074]

[0075] According to the statistical results, we can see that:

[0076] 1. Stable operation of anaerobic digestion reactor: During the 125-day stable operation period, the organic load reached 7kg VS / (m 3 ·d), the anaerobic digestion reactor has been in a high-load operation state. The daily added raw materials stay in the tank for 25 days, ensuring the full degradation of the raw materials. Under this operating condition, the methane concentration in the biogas reaches 61.6%, the pH value is about 8.1, and the anaerobic digestion reactor has been in a stable operation state.

[0077] 2. Operation of anaerobic digestion reactor: During the fermentation period, the gas production rate of the mixed raw material is about 57.8m 3 / t, the average daily gas production reached 347L, and the volumetric gas production rate of the anaerobic digestion reactor was about 1.6m 3 / (m 3 ·d), which is higher than the data reported in most biogas projects and similar patents currently.

[0078] 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 embodiments of the present invention.

Claims

1. A method for using an anaerobic digestion reactor, characterized in that , The anaerobic digestion reactor is composed of a tank cover, a tank body and a tank bottom. The tank cover is provided with an exhaust port, which is connected to an exhaust pipe. An exhaust valve is installed on the exhaust port. The exhaust pipe is connected to an external gas collection system. A feed port is installed on the tank cover, and a feed valve is installed on the feed port. The feed port is connected to an external feed device. A reduction motor is installed in the middle of the tank cover, and the reduction motor is located outside the tank cover. The reduction motor is connected to a transmission shaft through a coupling. A sealing assembly is installed at the connection between the reduction motor transmission shaft and the tank cover. The upper part of the tank body is connected to the tank cover, and the lower part is connected to the tank bottom. An insulation layer is wrapped outside the tank body. A tightening rod and a discharging scraper are installed on the transmission shaft in the tank body and the tank bottom from top to bottom in sequence. The reduction motor is automatically controlled by an automatic controller. A discharging port is installed in the center of the bottom of the tank bottom. The discharging valve is installed on the discharging port, and the discharging port is connected to an external discharging device. The method of use includes the following steps: Step 1. Pre-treat the fermentation raw materials. The particle size of the pre-treated raw materials should be less than 5mm. The pretreatment method is crushing, breaking and shearing; Step 2. Pre-inoculating the fermentation raw material obtained in step 1; Step 3. Put the fermentation raw material obtained in step 2 into the anaerobic digestion reactor, and seal the anaerobic digestion reactor; Step 4. Turn on the automatic controller to increase / maintain temperature, ensuring that the fermentation temperature in the anaerobic digestion reactor reaches the set value; Step 5. Set the operating value of the raw material reduction motor according to the expansion law of the fermentation raw material and start the automatic controller to control the movement of the reduction motor; Step 6. Set the feed and discharge rates according to the gas production rules of the fermentation raw materials, and feed and discharge the materials regularly according to the set values.

2. The method for using the anaerobic digestion reactor according to claim 1, characterized in that: In step 2, the number of methanogen cells in the inoculum selected for pre-inoculation is not less than 1×10 8 / g, the total number of microbial cells is not less than 1×10 9 The solid content of the inoculum is not less than 18%, the mass ratio of the inoculum is not less than 10%, and the solid content of the fermentation raw material after inoculation is not higher than 30%.

3. The method for using the anaerobic digestion reactor according to claim 1, characterized in that: The maximum feed amount in step 3 does not exceed 75% of the volume of the anaerobic digestion reactor.

4. The method for using the anaerobic digestion reactor according to claim 1, characterized in that: In step 5, the frequency, cycle and interval time of the reduction motor are set according to the fermentation raw materials, and the interval time is set to ≤12 times / day, the cycle is ≤5 minutes / time, and the frequency is ≤30 revolutions / minute.

5. The method for using the anaerobic digestion reactor according to claim 1, characterized in that: In step 6, the discharging cycle and the feed amount / discharging amount are set according to different fermentation raw materials, but the residence time of the material in the tank is ≥ 20 days.

6. The method for using the anaerobic digestion reactor according to claim 1, characterized in that: A bracket is also installed at the bottom of the tank to support and fix the anaerobic digestion reactor.

7. The method for using the anaerobic digestion reactor according to claim 1, characterized in that: The tank body is cylindrical with a height-to-diameter ratio of ≥2.5:

1. The heating facility adopts the method of heating inside the tank or heating the tank wall. When heating the tank wall, a jacket is installed on the outside of the tank body. Hot water is passed through the jacket. The tank body is heated by hot water circulation. The temperature inside the tank is automatically adjusted by an automatic controller. The number of tightening rods on the drive shaft is ≤5 groups, the width / thickness of the tightening rods is ≤1cm, and the ratio of length to tank diameter is 0.85-0.95:

1.

8. The method for using the anaerobic digestion reactor according to claim 1 or 6, characterized in that: The tank bottom is in the shape of a truncated cone with a taper of ≤4:

1. The tank bottom is connected to the tank body with equal diameter, and the lower bottom of the tank bottom is connected to the discharge port.

9. The method for using the anaerobic digestion reactor according to claim 1 or 6, characterized in that: A discharge scraper is installed in the bottom of the tank. There are 2-3 discharge scrapers. The discharge scraper is installed on a connecting rod. The connecting rod is installed at the end of the transmission shaft. The angle between the discharge scraper and the vertical direction is 60-85°. The transmission shaft is evenly spaced upward with tightening rods arranged in an umbrella shape along the transmission shaft as the axis.

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