A device and method for efficiently treating liquid livestock and poultry manure based on a CSTR integrated reactor

Abstract

The present invention discloses a device and a method for efficiently treating liquid manure of livestock and poultry based on a CSTR integrated reactor. The device provided by the present invention includes a reactor, a feeding system and a discharging system; the reactor includes a stirring device, the stirring device includes a vertical stirring shaft and a horizontal stirring rod, the two form an angle and are a hollow structure; a spiral belt stirring paddle is provided at the end of the horizontal stirring rod; the feeding system is provided with a feeding pipeline and a flushing pipeline; the discharging system is provided with a sand flushing pipeline and a water outlet pipeline. The present invention uses a stirring device to flush the material into the middle of the tank under stirring, which helps to mix it fully. At the same time, the flushing pipeline and the sand flushing pipeline are used to solve the defects of upper layer compaction and bottom layer sand deposition in the tank, thereby improving the efficiency of anaerobic digestion and methane production of liquid manure of livestock and poultry.

Description

Technical Field

[0001] The present invention belongs to the technical field of anaerobic digestion of sewage treatment, and specifically relates to a device and a method for efficiently treating liquid excrement of livestock and poultry based on a CSTR integrated reactor. Background Art

[0002] Liquid manure produced in large-scale livestock and poultry farming is rich in organic matter and nutrients, and is a kind of biomass energy that cannot be ignored. However, due to the non-systematic treatment, the nutrients in the liquid manure of livestock and poultry are discharged into the environment, causing environmental pollution. Therefore, there is an urgent need for a technology to efficiently treat liquid manure of livestock and poultry.

[0003] Anaerobic digestion technology has attracted a lot of attention due to its advantages in treating pollution and generating renewable energy.

[0004] The continuous stirred tank reactor (CSTR) is an anaerobic digestion technology that uses a stirring device to keep the fermentation raw materials and microorganisms in a completely mixed state. The CSTR reactor consists of a reactor body, a stirring device, a feed port, a discharge port, and a supporting control system. It has the characteristics of strong resistance to shock loads, easy operation control, and high scale production efficiency. It has unique advantages in treating liquid livestock and poultry manure with mixed organic matter content and high water content. However, due to the influence of the viscosity of the fluid formed by livestock and poultry manure and the operating defects of the CSTR reactor itself, the reaction process is often prone to uneven material distribution, crusting on the upper layer, sand settling on the bottom, and local "dead water areas", resulting in unstable anaerobic digestion gas production and poor continuous operation capacity.

[0005] Therefore, designing a device based on a CSTR integrated reactor to efficiently treat livestock and poultry liquid manure is of great significance for improving the stable, continuous and efficient operation of fully mixed anaerobic fermentation. Summary of the invention

[0006] The purpose of the present invention is to provide a device and a treatment method for efficiently treating liquid manure of livestock and poultry based on a CSTR integrated reactor, which can effectively solve the defects of upper layer compaction of internal materials, bottom layer sand settling, and local dead water in the system during the use of the existing CSTR integrated reactor, and realize the improvement of the methane production efficiency of anaerobic digestion.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides a device for treating liquid excrement of livestock and poultry, comprising a reactor, a feeding system and a discharging system;

[0009] The reactor is an integrated reaction tank based on CSTR; the upper part of the reaction tank body is a cylinder, and the lower part is a cone; a vertical stirring shaft is provided at the central axis of the top of the tank body; a rotating joint is provided at the top of the vertical stirring shaft, and the vertical stirring shaft is connected to the rotor of the rotating joint; the lower end of the vertical stirring shaft extends to the interior of the tank body, and a plurality of pairs of transverse stirring rods are provided along the shaft; the angle formed by the transverse stirring rod and the vertical stirring shaft is greater than 90°, preferably, an angle of 120° is formed; the vertical stirring shaft and the transverse stirring rod are hollow structures, forming a hollow material transfer pipe; a spiral ribbon stirring paddle is provided at the end of the transverse stirring rod, and the two ends of the spiral ribbon stirring paddle are connected to the transverse stirring rods at different heights; the side of the rotating joint is connected to a drive motor;

[0010] The feeding system comprises a water inlet pump, a water inlet pipe of the water inlet pump and a water outlet pipe of the water inlet pump; the water inlet pipe of the water inlet pump is connected to a livestock and poultry liquid manure storage tank; the water outlet pipe of the water inlet pump is divided into two branches: a feeding pipeline and a flushing pipeline; the feeding pipeline is connected to the stator part of the rotary joint; the flushing pipeline is connected to the side wall of the tank body, and the pipe opening of the flushing pipeline is located at the upper limit line of the liquid level of the tank body;

[0011] The discharge system includes a water outlet pump, a water outlet pump feed pipe and a water outlet pump discharge pipe; the outlet pipe of the water outlet pump feed pipe is located at the upper limit line of the liquid level of the tank body; the water outlet pump discharge pipe is divided into two branches: a sand flushing pipeline and a water outlet pipeline; the outlet pipe of the sand flushing pipeline is located at the lowest point of the bottom of the tank body; the water outlet pipeline is connected to a wastewater discharge device, and the outlet pipe of the water outlet pipeline is located at the lower limit line of the liquid level of the tank body.

[0012] The present invention delivers liquid livestock and poultry manure directly to the interior of the CSTR reactor through a hollow feed pipe, thereby improving the material transportation efficiency, reducing the need for additional pipelines, and saving space and costs; the vertical stirring shaft and the horizontal stirring rod are designed to be at an angle of 120°, and the strong shear force and flow generated during operation can make the feed evenly distributed inside the reactor, thereby improving the mixing effect; the above two means help to ensure the uniform distribution and sufficient reaction of the reactants in the reactor. In addition, the present invention also uses a branch design to use the flushing pipeline of the feed system to stir the upper layer of the reactor to prevent the upper layer of the feed from forming a hardened state, and at the same time uses the sand flushing pipeline of the discharge system to flush the sediment at the bottom of the reactor upward for mixing, thereby ensuring that the feed can fully undergo anaerobic digestion reaction.

[0013] In the present invention, a plurality of vertical baffles are arranged around the inner wall of the tank; the surface of the baffles is loaded with carbon cloth; and the number of the baffles is 8-10. The arrangement of the baffles enhances the mixing uniformity of the CSTR reactor and provides a medium for electron transfer, thereby enhancing the electron transfer between methanogens. By improving the efficiency of electron transfer, the degradation process of organic matter can be accelerated, and ultimately the methane production and overall conversion efficiency can be increased.

[0014] In the present invention, 2-4 pairs of transverse stirring rods are arranged along the vertical stirring shaft; the ratio of the length of the transverse stirring rod to the distance between two adjacent transverse stirring rods is (0.8-1.2):1.

[0015] In the present invention, an exhaust hole is provided on the top of the tank body, and a mud discharge pipe is provided on the bottom of the tank body.

[0016] In the present invention, a biogas collection system, a temperature control system and a pressure detection system are also provided on the top of the tank body; the biogas collection system is composed of a gas delivery pipe, a flow control valve and a gas storage tank; the temperature control system is composed of a temperature control probe, a heating belt and a temperature controller, wherein the heating belt is wound around the tank body; the pressure monitoring system is composed of a pressure sensor, a display and an alarm system;

[0017] In the present invention, the tank adopts a medium-temperature anaerobic system with a designed operating temperature of 30°C and a maximum daily processing capacity of 20m 3 .

[0018] In the present invention, the water inlet pump is a screw pump with a maximum flow rate of 5m 3 / h; the outlet pump is an axial flow pump, and the maximum flow rate is 10m 3 / h;

[0019] In a second aspect, the present invention provides a method for treating liquid livestock and poultry manure using the above device, comprising the following steps:

[0020] S1. Open the valve of the feed pipeline, and the liquid manure of livestock and poultry is pumped into the horizontal stirring rod through the vertical stirring shaft;

[0021] S2, turning on the driving motor, under the action of the spiral ribbon stirring paddle, the livestock and poultry liquid manure in the horizontal stirring rod is flushed into the tank of the reactor, mixed with the anaerobic activated sludge, and anaerobic digestion reaction is carried out;

[0022] S3. During the reaction, the feed pipeline is closed, and the flushing pipeline and the sand flushing pipeline are opened; the temperature inside the tank is monitored by the temperature control system, the pressure inside the tank is monitored by the pressure monitoring system, and the generated biogas is collected by the biogas collection system;

[0023] S4. After the reaction is completed, turn off the drive motor, flushing pipeline and sand flushing pipeline, let it stand, open the water outlet pipeline and drain the water.

[0024] The rotation speed of the screw-ribbon stirring blade is 10-750 r / min.

[0025] The working principle of the device of the present invention is as follows:

[0026] When the device of the present invention is used, the liquid excrement of livestock and poultry enters the vertical stirring shaft through the feed pipe via the water pump, and while the spiral-belt stirring paddle rotates, the liquid excrement of livestock and poultry rushes into the middle of the reactor tank. Since the spiral-belt stirring paddle rotates, the liquid excrement of livestock and poultry also carries dynamic potential energy before entering the CSTR reactor tank, thereby enhancing the uniformity of material mixing and eliminating the situation of local dead water area of ​​the CSTR reactor material.

[0027] By opening the flushing pipeline and the sand flushing pipeline in stages, the problems of material compaction on the upper layer and sand deposition on the bottom layer of the CSTR reactor can be solved.

[0028] Since the baffle in the CSTR reactor tank is loaded with a certain amount of carbon cloth, on the basis of improving the uniformity of material mixing in the CSTR reactor, it promotes the electron transfer between methanogens in anaerobic digestion, enhances the electrochemical activity of microorganisms, and thus improves the organic matter conversion efficiency and methane production.

[0029] Compared with the prior art, the present invention has the following beneficial technical effects:

[0030] (1) Enhanced stirring efficiency inside the CSTR reactor. The CSTR reactor uses a hollow stirring shaft as a feed channel to directly transport livestock and poultry liquid manure into the reactor. This not only improves the material transportation efficiency, but also reduces the need for additional pipelines, saving space and costs. Since the vertical stirring shaft and the horizontal stirring rod form a 120° angle, the strong shear force and flow generated during operation enable the feed to be evenly distributed inside the reactor, improving the mixing effect. This helps to ensure uniform distribution and sufficient reaction of the reactants in the reactor.

[0031] (2) Eliminate the phenomenon of hardening in the upper layer of the CSTR reactor. Using a flushing pipe for flushing in the CSTR reactor can prevent suspended matter from gathering and forming hardening in the upper layer of the reactor. By continuous flushing, the suspended matter is brought back into the stirring system of the CSTR reactor, thereby promoting full mixing and reaction of the materials. This not only helps to maintain a uniform distribution of materials in the reactor, but also improves reaction efficiency and reduces the complexity of reactor maintenance.

[0032] (3) Improved the sand settling phenomenon at the bottom of the CSTR reactor. A flushing pipe is used in the CSTR reactor to redirect the precipitated and deposited materials back to the stirring system inside the reactor, avoiding the materials from staying in the reactor for a long time, improving the mixing of materials in the reactor, ensuring that all materials can fully participate in the reaction, and improving the mixing uniformity and reaction efficiency. Regular use of a sand flushing pipe to flush the precipitated materials can reduce the fouling problem inside the reactor, thereby reducing the maintenance cost and cleaning difficulty of the equipment. At the same time, the hollow stirring shaft design also helps to reduce the problem of sedimentation or blockage of materials during feeding and stirring. The liquid can flow inside the stirring shaft and enter the reactor, reducing the chance of sedimentation and precipitation.

[0033] (4) Improved the efficiency of methane production inside the CSTR reactor. The use of a carbon cloth-loaded baffle design in the CSTR reactor enhances the mixing uniformity of the CSTR reactor and provides a medium for electron transfer, thereby enhancing electron transfer between methanogens. By improving the efficiency of electron transfer, the degradation process of organic matter can be accelerated, ultimately increasing the methane production and overall conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the device for efficiently treating liquid manure of livestock and poultry based on the CSTR integrated reactor of the present invention.

[0035] Figure 1 The marks are as follows:

[0036] 1-liquid manure collection tank for livestock and poultry, 2-water inlet pump inlet pipe, 3-water inlet pump, 4-water inlet pump outlet pipe, 5-flushing pipeline, 6-feeding pipeline control valve, 7-feeding pipeline, 8-spare end, 9-swivel joint, 10-drive motor, 11-vertical stirring shaft, 12-hollow feed pipe, 13-horizontal stirring rod, 14-spraying port, 15-carbon cloth load baffle, 16-flushing pipeline control valve, 17-flushing pipeline inlet hole, 18-flushing pipeline nozzle, 19-temperature controller, 20-temperature probe inlet hole, 21 -temperature probe, 22-inlet hole of stirring shaft, 23-air pressure probe hole, 24-pressure controller, 25-gas flow controller, 26-exhaust hole, 27-inlet hole of discharge pipeline, 28-feeding pipe of water outlet pump, 29-water outlet pump, 30-control valve of sand flushing pipeline, 31-inlet hole of sand flushing pipeline, 32-nozzle of sand flushing pipeline, 33-sand flushing pipeline, 34-control valve of water outlet pipeline, 35-water outlet pipeline, 36-inlet hole of mud discharge pipe, 37-mud discharge pipe, 38-control valve of mud discharge pipe, 39-reactor, 40-ribbon agitator.

[0037] Figure 2 This is a schematic structural diagram of the spiral ribbon stirring paddle provided by the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to the following embodiments.

[0039] The structural parameters of the CSTR reactor used in the following examples are as follows: single-seat size Φ2.4m×5.5m, the tank body is made of 8mm carbon steel, the inner wall is anti-corrosive with 2 layers of epoxy or five oils and three cloths, the exterior is painted with 2 coats of anti-rust paint, the insulation is heated by heating tape, and the insulation layer is wrapped with colored steel tiles. The reaction tank adopts a medium-temperature anaerobic system, the design operating temperature is 30°C, and the maximum daily processing capacity of the CSTR reactor is 20m 3 .

[0040] The CSTR reactor used in the following examples is equipped with the following facilities: 1 feed storage tank with a capacity of 5m 3 ; The water inlet pump is a screw pump with a maximum flow rate of 5m 3 / h; the outlet pump is an axial flow pump, and the maximum flow rate is 10m 3 / h; the material pipeline is made of PE with a diameter of DN50, the mud discharge pipeline is made of PE with a diameter of DN100; the biogas pipeline is made of PE material special for gas with a diameter of DN50; the pipeline bracket, equipment support, etc. are made of galvanized steel; the material pipeline valve is a gate valve with a carbon steel valve body and a stainless steel valve plate; the pressure level of all pipeline systems is PN1.0.

[0041] Example

[0042] like Figure 1 As shown, the reaction device for efficiently treating liquid excrement of livestock and poultry provided by the present invention comprises: a reactor 39, a feeding system, and a discharging system;

[0043] Reactor

[0044] The reactor 39 is an integrated reactor based on CSTR, which includes a stirring device; the stirring device includes a vertical stirring shaft 11, a horizontal stirring rod 13, a screw-belt stirring paddle 40, a driving motor 10 and a rotary joint 9; the upper end of the vertical stirring shaft 11 is connected to the rotor part of the rotary joint 9, and the side of the rotary joint 9 is connected to the driving motor 10;

[0045] The middle and lower part of the vertical stirring shaft 11 is provided with a plurality of groups of transverse stirring rods 13 of different heights along the shaft, and each group of transverse stirring rods has two transverse stirring rods; the vertical stirring shaft 11 and the transverse stirring rods 13 are both hollow structures, forming a hollow material transfer pipe 12; the vertical stirring shaft and the transverse stirring rod form an angle of 120°; the length of a single-side transverse stirring rod is 1m, and the distance between two adjacent transverse stirring rods in the axial direction is 1.2m;

[0046] The end of the transverse stirring rod 13 is a spray port 14; the spray port 14 is connected to a spiral ribbon stirring paddle 40, such as Figure 2 As shown, the two ends of the ribbon stirring paddle are respectively connected to different groups of transverse stirring rods;

[0047] In the tank body, a plurality of vertical carbon cloth-loaded baffles 15 are evenly arranged around the inner wall; the number of the carbon cloth-loaded baffles 15 is 8; through the arrangement, the baffles promote the electron transfer between methanogens in anaerobic digestion on the basis of promoting uniform mixing of materials, thereby improving the organic matter conversion efficiency and methane production.

[0048] A mud discharge pipe 37 is also provided at the bottom of the tank body, and a mud discharge pipe control valve 38 is provided on the mud discharge pipe 37; an exhaust hole 26 is also provided on the top of the tank body; and a temperature controller 19, a temperature probe inlet hole 20, a temperature probe 21, an agitator shaft inlet hole 22, an air pressure probe hole 23, a pressure controller 24, and a gas flow controller 25 are also provided on the tank body of the reactor.

[0049] Feeding system

[0050] The feeding system includes an inlet pump 3, an inlet pipe 2 and an outlet pipe 4; the inlet pipe 2 is connected to a livestock and poultry liquid manure storage tank 1; the outlet pipe 4 is divided into two branches: a feed pipeline 7 and a flushing pipeline 5; a feed pipeline control valve 6 is provided on the feed pipeline 7, and a spare end 8 is provided at the end of the feed pipeline 7, and the spare end 8 is connected to the stator part of the rotary joint 9; a flushing pipeline control valve 16 is provided on the flushing pipeline 5, and the nozzle 18 of the flushing pipeline 5 is located at the upper limit of the liquid level of the reactor 39.

[0051] The water inlet pump is a screw pump; the water inlet pipe of the water inlet pump and the water outlet pipe of the water inlet pump are made of PE or metal.

[0052] Discharging system

[0053] The discharge system includes a water outlet pump 29, a water outlet pump feed pipe 28 and a water outlet pump discharge pipe; the outlet of the water outlet pump feed pipe 28 is located at the upper limit of the liquid level of the reactor 39; the water outlet pump discharge pipe is divided into two branches: a water outlet pipeline 35 and a sand flushing pipeline 33; the sand flushing pipeline 33 is connected to the bottom of the reactor 39, and a nozzle 32 is installed at the end of the sand flushing pipeline 33. A control valve 30 is provided on the sand flushing pipeline 33. Through the reflux mode of the sand flushing pipeline, the precipitated and deposited materials are prompted to return to the stirring system of the CSTR reactor, so that the materials react more fully; the outlet of the water outlet pipeline 35 is located at the lower limit of the liquid level of the reactor 39, and a control valve 34 is provided on the water outlet pipeline 35.

[0054] The tank body is correspondingly provided with a discharge pipe inlet hole 27, a sand flushing pipe inlet hole 31, a mud discharge pipe inlet hole 36, and a flushing pipe inlet hole 17.

[0055] When using the device of the present invention to efficiently treat liquid livestock and poultry manure, the following steps can be followed:

[0056] S1. First operation: open the feed pipeline control valve 6, close the flushing pipeline control valve 16, and the livestock and poultry liquid manure stored in the feed temporary storage tank 1 is pumped by the water inlet pump 3 and transferred to the empty end 8 through the feed pipeline 7.

[0057] S2, turn on the drive motor 10, the rotary joint 9 drives the vertical stirring shaft 11 to rotate, and at the same time, kinetic energy is given to the material. Since the free end 8 is connected to the vertical stirring shaft 11, the material liquid passes through the hollow material transfer pipe 12 and finally enters the CSTR reaction tank 39 from the injection port 14. Under the full stirring of the spiral stirring belt 40, the materials in the reaction system are fully mixed. The speed of the spiral stirring blade is between 10 and 750 r / min.

[0058] S3, the water inlet pump 3 feeds the CSTR reactor 39 intermittently, pumping once every 2 hours, each time for 1 hour. After pumping 3 times, close the feed pipeline control valve 6, open the flushing pipeline control valve 16, and the material enters the CSTR reactor 39 through the flushing pipeline 5 and the flushing pipeline nozzle 18 to flush the floating suspended matter to prevent long-term aggregation and form agglomeration, so that the material enters the CSTR reactor stirring system to make anaerobic digestion more complete.

[0059] S4, feed 20m per day 3 After that, at an interval of 2 hours, the sand flushing pipeline control valve 30 is opened, and the outlet pipeline control valve 34 is closed. The material in the reflux reaction tank is pumped through the outlet pump 29, through the sand flushing pipeline 33, and the sand flushing pipeline nozzle 32 is used to increase the hydraulic flow rate, thereby flushing the bottom sediment material and allowing the material to enter the CSTR reactor stirring system, so that the anaerobic digestion is more complete and the methane production efficiency is improved.

[0060] S5. During operation, the temperature inside the CSTR reactor tank 39 is controlled by the temperature controller 19, the pressure inside the CSTR reactor tank 39 is monitored by the pressure monitor 24, and the flow rate of biogas entering the gas storage tank is adjusted by the gas flow controller 25.

[0061] S6. After running for 22 hours, turn off the drive motor 10, stop stirring, turn off the outlet pump 29, and let the CSTR reactor settle. After settling for 1 hour, open the outlet pipe control valve 34, close the sand flushing pipe control valve 30, and discharge the treated livestock and poultry liquid manure wastewater through the outlet pump 29.

[0062] Application Examples

[0063] According to the above steps, the experiment of treating livestock and poultry liquid manure in the CSTR integrated reactor device was carried out to detect the COD concentration of the reactor wastewater and monitor the daily biogas production. The results showed that the feed COD concentration of livestock and poultry liquid manure of 50,000~70,000 mg / L can be treated to a COD concentration of 2000~5000 mg / L, with significant effect. Compared with the conventional CSTR reactor, the biogas volumetric yield is 0.8~1.2m 3 STP / (m 3 ·d) The volumetric gas production rate of the anaerobic fermentation in the above embodiment is increased by 30-40% compared with the existing level.

[0064] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A device for treating liquid excrement of livestock and poultry, characterized in that: It includes a reactor, a feeding system and a discharging system; The reactor is based on a CSTR integrated reaction tank; the upper part of the reaction tank body is a cylinder, and the lower part is a cone; a vertical stirring shaft is provided at the top center axis of the tank body; a rotary joint is provided at the top of the vertical stirring shaft, and the vertical stirring shaft is connected to the rotor of the rotary joint; the side of the rotary joint is connected to a driving motor; The lower end of the vertical stirring shaft extends to the interior of the tank body, and a plurality of pairs of transverse stirring rods are provided along the shaft; The vertical stirring shaft and the horizontal stirring rod are hollow structures, forming a hollow material transfer pipe; The vertical stirring shaft is provided with 2-4 pairs of transverse stirring rods along the shaft; the ratio of the length of the transverse stirring rod to the distance between two adjacent transverse stirring rods is (0.8-1.2): 1; A plurality of vertical baffles are arranged around the inner wall of the tank; the surface of the baffles is loaded with carbon cloth; the number of the baffles is 8-10; The transverse stirring rod is inclined downward relative to the vertical stirring shaft, and the angle formed with the vertical stirring shaft along the vertical direction is 120°; a screw-belt stirring paddle is provided at the end of the transverse stirring rod, and the two ends of the screw-belt stirring paddle are connected to the transverse stirring rod at different heights; The feeding system comprises a water inlet pump, a water inlet pipe of the water inlet pump and a water outlet pipe of the water inlet pump; the water inlet pipe of the water inlet pump is connected to a livestock and poultry liquid manure storage tank; the water outlet pipe of the water inlet pump is divided into two branches: a feeding pipeline and a flushing pipeline; the feeding pipeline is connected to the stator part of the rotary joint; the flushing pipeline is connected to the side wall of the tank body, and the pipe opening of the flushing pipeline is located at the upper limit line of the liquid level of the tank body; The discharge system includes a water outlet pump, a water outlet pump feed pipe and a water outlet pump discharge pipe; the outlet pipe of the water outlet pump feed pipe is located at the upper limit line of the liquid level of the tank body; the water outlet pump discharge pipe is divided into two branches: a sand flushing pipeline and a water outlet pipeline; the outlet pipe of the sand flushing pipeline is located at the lowest point of the bottom of the tank body; the water outlet pipeline is connected to a wastewater discharge device, and the outlet pipe of the water outlet pipeline is located at the lower limit line of the liquid level of the tank body.

2. The device according to claim 1, characterized in that The top of the tank body is provided with an exhaust hole, and the bottom of the tank body is provided with a mud discharge pipe; The top of the tank body is also provided with a biogas collection system, a temperature control system and a pressure monitoring system; the biogas collection system is composed of a gas delivery pipe, a flow control valve, and a gas storage tank; the temperature control system is composed of a temperature control probe, a heating belt, and a temperature controller; the pressure monitoring system is composed of a pressure sensor, a display, and an alarm system.

3. The device according to claim 2, characterized in that The tank adopts a medium-temperature anaerobic system with a designed operating temperature of 30°C and a maximum daily processing capacity of 20m 3 .

4. The device according to claim 3, characterized in that The water inlet pump is a screw pump with a maximum flow rate of 5m 3 / h; The outlet pump is an axial flow pump with a maximum flow rate of 10m 3 / h.

5. A method for treating liquid manure of livestock and poultry using the device according to any one of claims 1 to 4, characterized in that: The steps include: S1. Open the valve of the feed pipeline, and the liquid manure of livestock and poultry is pumped into the horizontal stirring rod through the vertical stirring shaft; S2, turning on the driving motor, under the action of the spiral ribbon stirring paddle, the livestock and poultry liquid manure in the horizontal stirring rod is flushed into the tank of the reactor, mixed with the anaerobic activated sludge, and anaerobic digestion reaction is carried out; S3, during the reaction, close the feed pipeline, and open the flushing pipeline and the sand flushing pipeline; The temperature inside the tank is monitored by the temperature control system, the pressure inside the tank is monitored by the pressure monitoring system, and the generated biogas is collected by the biogas collection system; S4. After the reaction is completed, turn off the drive motor, flushing pipeline and sand flushing pipeline, let it stand, open the water outlet pipeline and drain the water.

6. The method according to claim 5, characterized in that The rotation speed of the screw-ribbon stirring blade is 10-750 r / min.

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