A two-phase integrated anaerobic digestion and exogenous particulate recycling device

Abstract

The present application belongs to the field of biomass anaerobic digestion, and provides a two-phase integrated anaerobic digestion and exogenous particle recycling device.The device comprises a main reactor, an online liquid level control system, a gas collection system and a gas backflow stirring system, and the main reactor contains a hydrolysis acidification zone, an acid production buffer zone and a methane production zone.The hydrolysis acidification zone is provided with a hydrolysis acidification chamber, a stirring device, a hydrolysis acidification chamber sample discharge port and a sample inlet.The acid production buffer zone comprises an acid production buffer chamber and an improved three-way valve.The methane production zone comprises a methane production chamber sample discharge port, a gas distribution device, a methane production chamber, a PVC connecting pipe, a particle settling zone, an overflow sample discharge port, a partition, a particle settling zone sample discharge port, a baffle and a sludge discharge port.The two-phase integrated anaerobic digester in the present application separates the hydrolysis acidification zone and the methane production zone through an upper and lower layered anaerobic digestion tank, which is conducive to improving the organic load and volumetric gas production rate of the system, and the reactor structure is compact, reducing the floor area.

Description

Technical Field

[0001] This invention belongs to the field of biomass anaerobic digestion and relates to an anaerobic digestion device, especially a two-phase integrated anaerobic digestion and exogenous particulate matter recycling device. Background Technology

[0002] Anaerobic digestion, as a mature biomass conversion technology, can recover energy from organic waste, thereby achieving the goals of volume reduction, stabilization, and resource recovery. This process involves a series of microbial activities, including those of hydrolytic acidifying bacteria and methanogenic bacteria. However, during anaerobic digestion, various microorganisms exhibit significant differences in environmental adaptability, nutritional requirements, and growth kinetics. Therefore, using a two-phase anaerobic reactor allows hydrolytic acidifying bacteria and methanogenic bacteria to grow under their respective optimal environmental conditions, enhancing microbial activity, fully utilizing their respective functions, and ultimately improving volumetric loading rate and treatment efficiency.

[0003] Compared to single-phase anaerobic digestion, two-phase anaerobic digestion enhances the metabolic capacity of microorganisms, enabling them to withstand higher load shocks and improve the conversion efficiency of organic waste. However, traditional two-phase anaerobic digestion devices also have certain bottlenecks: 1) the anaerobic reactor occupies a large area and the system operation is cumbersome; 2) considering the difference in water quality between the hydrolysis-acidification stage and the methanogenesis stage, the properties of the fermentation broth generated during the hydrolysis-acidification stage flowing into the methanogenesis chamber do not meet the growth environment requirements of methanogens.

[0004] In recent years, researchers have discovered that environmentally friendly carbon-based and iron-based particulate materials, such as activated carbon, biochar, graphene, and magnetite, can help improve the anaerobic conversion efficiency of organic waste. The inherent properties of particulate materials can improve the anaerobic digestion environment, enrich functional microorganisms, and enhance microbial activity. Therefore, they have received increasing attention for improving the efficiency of anaerobic digestion of organic waste. However, exogenous particulate matter is discharged with the digestate or sludge after the reaction, making recycling difficult. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a two-phase integrated anaerobic digestion and exogenous particulate matter recycling device, which can realize the phase separation of hydrolysis acidification and methanogenesis in the same reactor, and regulate the water quality of the fermentation broth produced in the hydrolysis acidification stage to meet the growth requirements of methanogenic bacteria. At the same time, the added exogenous particulate matter is recycled, which helps to maintain the stability of the anaerobic digestion system, improve the treatment efficiency of organic waste, and save operating costs.

[0006] This invention addresses the shortcomings of existing technologies by placing the acidification and methanogenesis processes in the upper and lower parts of a cylindrical reactor, respectively, and utilizing physical separation to recycle the added exogenous particulate matter, thus coupling them into an integrated two-phase anaerobic reactor. The reactor has a compact structure, simultaneously meeting the growth requirements of hydrolytic acidifying bacteria and methanogenic bacteria, improving organic volumetric loading efficiency; and by retaining and recovering exogenous particulate matter, recycling is achieved, saving costs.

[0007] The present invention adopts the following technical solution:

[0008] This invention provides a two-phase integrated anaerobic digestion and exogenous particulate matter recycling device. The device includes a main reactor (containing a hydrolysis acidification zone, an acid production buffer zone, and a methanogenesis zone), an online liquid level control system, a gas collection system, and a gas reflux stirring system.

[0009] The main reactor is cylindrical and has an upper and lower layered structure. The upper part is the hydrolysis acidification zone and the lower part is the methanogenic zone. The hydrolysis acidification chamber 20 is cylindrical and located above the acidification buffer zone. The bottom is sealed and the supernatant overflows from the top. The hydrolysis acidification chamber inlet 10 is located in the hydrolysis acidification chamber and extends to the bottom of the hydrolysis acidification chamber.

[0010] The acid-producing buffer chamber 19 includes a region separating the hydrolysis acidification chamber 20 from the main reactor and a triangular cone-shaped region at the bottom of the hydrolysis acidification chamber 20; the acid-producing buffer chamber 19 receives the overflow liquid from the hydrolysis acidification chamber 20, and the volume of the acid-producing buffer chamber 19 is 2-3 times greater than the maximum feed rate of the hydrolysis acidification chamber 20, and its bottom is connected to an improved three-way valve 7.

[0011] Compared to traditional three-way valves, the improved three-way valve 7 contains a gasket, preferably a copper gasket. The gasket is wider at the top and narrower at the bottom, forming a seal with the bottom thread of the improved three-way valve 7. The upper part of the gasket is connected to the built-in lifting line 12 to prevent water from seeping downwards. The top of the improved three-way valve 7 is connected to the hydrolysis acidification chamber 20, the bottom is connected to the PVC connecting pipe 4, and the middle is connected to the inlet and outlet ports 6 of the acid production buffer zone.

[0012] The top of the PVC connecting pipe 4 is connected to the improved three-way valve 7, and the other end extends below the liquid level in the methanogenic chamber 3, forming a liquid seal. A liquid seal refers to a seal formed by a liquid. Generally, liquid seals are suitable for situations where the internal and external pressure difference is not large, the sealing requirements are high, or valve installation is not feasible. The medium used in a liquid seal is generally required not to react with the gas being sealed.

[0013] The inlet and outlet ports 6 of the acid-producing buffer zone are connected to an improved three-way valve 7. Before reactor operation, the inoculum and exogenous particulate matter in the methanogenic chamber 3 are replenished through the inlet portion of the inlet and outlet ports 6. During reactor operation, fermentation broth can be taken from the outlet portion of the outlet port 6 to monitor the water quality conditions in the acid-producing buffer chamber. The pH can be adjusted by adding alkaline solutions such as NaHCO3 through the inlet.

[0014] The online liquid level control system includes a PLC controller 11, a liquid level gauge 5, and a built-in lifting cable 12. The PLC controller 11 is connected to both the liquid level gauge 5 and the built-in lifting cable 12. The built-in lifting cable 12 is placed inside a hollow tube 9, with one end connected to a gasket inside a modified three-way valve 7 and the other end connected to the PLC controller 11.

[0015] According to the indication of the level gauge 5, the PLC controller 11 controls the built-in lifting line 12 to lift the gasket in the improved three-way valve 7, and controls the fermentation liquid in the acid production buffer chamber 19 to flow down to the methanogenic chamber 3.

[0016] The hydrolysis acidification chamber discharge port 8 is used to discharge sludge from the hydrolysis acidification chamber 20; the methanogenesis chamber discharge port 1 is used to collect the mixed liquid from the methanogenesis chamber 3 for index determination. The sludge discharge port 26 is used to discharge sludge from the methanogenesis chamber 3.

[0017] The first gas collecting pipeline 23 and the second gas collecting pipeline 18 are respectively arranged at the top of the hydrolysis acidification chamber 20 and the methanogenic chamber 3, and are connected to the gas flow meter 24.

[0018] The gas recirculation stirring system includes a gas recirculation pipeline 21, an air pump 22, and a gas distribution device 2. The gas recirculation pipeline 21 is connected to the outlet end of a gas flow meter 24. The air pump 22 controls the speed and time of gas recirculation, and finally, the gas distribution device 2 recirculates biogas to stir the methanogenic chamber 3.

[0019] The particulate matter sedimentation zone is located in the methanogenic zone, and is separated from the methanogenic chamber 3 by a baffle 14. The baffle 17 is located on the main reactor wall, above the particulate matter sedimentation zone, and forms a flow channel with the baffle 14 to reduce the passage of particulate matter and prevent backflow. The overflow discharge port 16 is used to discharge the supernatant from the methanogenic chamber 3; the particulate matter sedimentation zone discharge port 13 can recover the precipitated particulate matter.

[0020] The exogenous particulate matter refers to all added particulate matter that can promote anaerobic digestion and methanogenesis, such as activated carbon, biochar, magnetite, and zero-valent iron.

[0021] It is worth noting that the PLC controller in this invention can be a commercially available product. Its control principle of controlling the operation of its connected components through programming logic is already very mature and can be achieved using existing technology, so it will not be elaborated here.

[0022] The present invention provides a two-phase integrated anaerobic digestion and exogenous particulate matter recycling device, which can realize the phase separation of hydrolysis acidification and methanogenesis in the same reactor, regulate the water quality of the fermentation broth produced in the hydrolysis acidification stage, meet the growth requirements of methanogenic bacteria, maintain the stability of the anaerobic digestion system, and improve the treatment efficiency of organic waste.

[0023] Meanwhile, the two-phase integrated anaerobic digestion and exogenous particulate matter recycling device is used to intercept and recover exogenous particulate matter, so as to achieve recycling and save costs.

[0024] When using the device of this invention, the stirring device should be turned off before sample injection, and the digestion liquid should be allowed to settle. The improved three-way valve 7 contains a copper gasket, which is wider at the top and narrower at the bottom. The gasket forms a seal with the thread at the bottom of the three-way valve, which can prevent the water from flowing down from the top.

[0025] In this invention, the reactor, also known as the main reactor, contains a hydrolysis-acidification zone, an acid-producing buffer zone, and a methanogenic zone. Upon startup, the fermentation broth level in the hydrolysis-acidification chamber 20 is controlled to reach overflow height, and the acid-producing buffer chamber 19 receives the overflow liquid from the hydrolysis-acidification chamber 20. Inoculum and exogenous particulate matter in the methanogenic chamber 3 are replenished through the inlet portion of the inlet / outlet 6 of the acid-producing buffer zone, ensuring that the digestion broth level in the methanogenic chamber 3 is higher than the overflow outlet height.

[0026] During reactor operation, the digestate in the hydrolysis-acidification chamber 20 and the methanogenesis chamber 3 is thoroughly mixed using intermittent stirring via the stirring device 25 and the gas reflux stirring system. Samples are taken from the discharge ports 8 and 1 of the hydrolysis-acidification chamber and the methanogenesis chamber to monitor various water quality indicators. The sludge concentration is adjusted via the sludge discharge port 26. Water quality conditions in the acidification buffer chamber 19 are monitored by taking samples from the discharge ports 6 of the acidification buffer zone. Simultaneously, the pH and other conditions of the water are adjusted via the inlet to meet the growth environment requirements of methanogenic bacteria.

[0027] The beneficial effects of this invention are as follows:

[0028] This invention is applicable to the anaerobic digestion of organic waste such as kitchen waste, agricultural and livestock waste, and urban sludge. Compared with traditional two-phase anaerobic reactors, this device has the following advantages:

[0029] The device of this invention adopts an integrated upper and lower layered structure, with the upper part being a hydrolysis acidification chamber and the lower part being a methanogenic chamber. Phase separation is achieved within the same reactor, resulting in a simple structure, strong applicability, and small footprint.

[0030] In this invention, the acid-producing buffer chamber is located between the hydrolysis acidification chamber and the methanogenesis chamber. Through the inlet and outlet, the water quality indicators such as pH of the fermentation broth produced in the hydrolysis acidification chamber are monitored. When the fermentation broth is acidified, alkaline solutions such as NaHCO3 are added to adjust the pH level, thereby controlling the water quality of the fermentation broth entering the methanogenesis chamber to meet the growth environment requirements of methanogenic bacteria.

[0031] The online liquid level control system of this invention inputs instructions from the liquid level gauge to the PLC controller, and uses an improved three-way valve and built-in lifting line to intercept and release the fermentation broth in the hydrolysis acidification chamber, so as to ensure the difference in water retention time between the hydrolysis acidification chamber and the methanogenic chamber.

[0032] The particulate matter settling zone in this invention can intercept and recycle exogenous particulate matter to achieve recycling and save costs. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, each drawing described below is for a part of the embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the two-phase integrated anaerobic digestion and exogenous particulate matter recycling device of the present invention.

[0035] Figure 2 This is a schematic diagram of the improved three-way valve part of the present invention.

[0036] The accompanying diagrams are labeled as follows:

[0037] 1. Methanogenic chamber discharge port; 2. Gas distribution device; 3. Methanogenic chamber; 4. PVC connecting pipe; 5. Level gauge; 6. Acid-producing buffer zone inlet and outlet; 7. Improved three-way valve; 8. Hydrolysis acidification chamber discharge port; 9. Hollow tube; 10. Hydrolysis acidification chamber inlet; 11. PLC controller; 12. Built-in lifting line; 13. Particulate matter settling zone discharge port; 14. Baffle; 15. Particulate matter settling zone; 16. Overflow discharge port; 17. Baffle; 18. Second gas collection pipeline; 19. Acid-producing buffer chamber; 20. Hydrolysis acidification chamber; 21. Gas return pipeline; 22. Gas pump; 23. First gas collection pipeline; 24. Gas flow meter; 25. Stirring device; 26. Sludge discharge port. Detailed Implementation

[0038] This invention relates to a two-phase integrated anaerobic digestion and exogenous particulate matter recycling device, belonging to the field of biomass anaerobic digestion. The device includes a main reactor (containing a hydrolysis acidification zone, an acid production buffer zone, and a methanogenic zone), an online liquid level control system, a gas collection system, and a gas reflux stirring system.

[0039] The technical solution will be clearly and completely described below through embodiments of this application. Obviously, the described embodiments are only some preferred embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0040] Example 1

[0041] A two-phase integrated anaerobic digestion and exogenous particulate matter recycling device includes a main reactor (containing a hydrolysis acidification zone, an acid production buffer zone, and a methanogenic zone), an online liquid level control system, a gas collection system, and a gas reflux stirring system.

[0042] The hydrolysis acidification zone includes a hydrolysis acidification chamber 20, a sample inlet pipeline, and a stirring device.

[0043] The acid-producing buffer zone is isolated from the hydrolysis-acidification zone and the methanogenesis zone. It includes an acid-producing buffer chamber 19 and an improved three-way valve 7. The acid-producing buffer zone can monitor and regulate the parameters of the digestate in the hydrolysis-acidification chamber to meet the growth environment requirements of methanogens.

[0044] The online liquid level control system includes a PLC controller 11, a liquid level gauge 5, and a built-in lifting cable 12. The PLC controller 11 is connected to the liquid level gauge 5 and the built-in lifting cable 12 respectively.

[0045] The methanogenic zone includes a methanogenic chamber 3, a stirring device, a particulate matter settling zone, a baffle 17, and an overflow discharge pipe. In the methanogenic zone, the discharge of exogenous particulate matter is reduced through supernatant overflow and settling.

[0046] The gas collection system includes a first gas collection pipeline 23, a second gas collection pipeline 18, and a gas flow meter 24. The gas recirculation and stirring system includes a gas recirculation pipeline 21, a gas pump 22, and a gas distribution device.

[0047] The two-phase integrated anaerobic digester of this invention separates the hydrolysis acidification zone and the methanogenic zone through the upper and lower layered anaerobic digester, which is beneficial to improving the organic load and volumetric gas production rate of the system. The reactor has a compact structure and reduces the floor space required.

[0048] Example 2

[0049] When the reactor in the device of the present invention is started, the fermentation liquid level in the hydrolysis acidification chamber 20 reaches the overflow height. The inoculum liquid and exogenous particulate matter in the methanogenic chamber 3 are replenished through the inlet of the inlet and outlet of the acid production buffer zone 6. The digestion liquid level in the methanogenic chamber 3 is higher than the overflow outlet height.

[0050] During reactor operation, the digestate in the hydrolysis acidification chamber and the methanogenesis chamber is fully mixed by intermittent stirring using the stirring device 25 and the gas reflux stirring system. Samples are taken through the discharge port 8 of the hydrolysis acidification chamber and the discharge port 1 of the methanogenesis chamber to monitor various water quality indicators in the hydrolysis acidification chamber and the methanogenesis chamber. The sludge concentration is adjusted through the sludge discharge port 26.

[0051] Before sampling, the stirring device is turned off, and the digestion liquid is allowed to settle. The sampling inlet 10 of the hydrolysis-acidification chamber is located inside the hydrolysis-acidification chamber and extends to the bottom of the chamber. The acid-producing buffer chamber 19 includes the area separating the hydrolysis-acidification chamber from the main reactor and a triangular pyramidal area at the bottom of the hydrolysis-acidification chamber. It receives the overflow liquid from the hydrolysis-acidification chamber 20. The volume of the acid-producing buffer chamber is 2-3 times larger than the maximum feed capacity of the hydrolysis-acidification chamber. Its bottom is connected to an improved three-way valve 7. The improved three-way valve 7 contains a copper gasket, which is wider at the top and narrower at the bottom. The gasket and the bottom thread of the three-way valve form a seal to prevent the upper water from flowing down. Its top is connected to the hydrolysis-acidification chamber, its bottom is connected to a PVC connecting pipe 4, and its middle is connected to the inlet and outlet ports 6 of the acid-producing buffer zone. Samples are taken from the outlet portion of the inlet and outlet ports 6 of the acid-producing buffer zone to monitor the water quality conditions of the acid-producing buffer chamber 19. At the same time, the pH and other conditions of the water are adjusted through the sampling inlet to meet the growth environment requirements of methanogens.

[0052] The online liquid level control system includes a PLC controller 11, a liquid level gauge 5, and a built-in lifting cable 12. The PLC controller 11 is connected to both the liquid level gauge 5 and the built-in lifting cable 12. The built-in lifting cable 12 is placed inside a hollow tube 9, with one end connected to a gasket inside a modified three-way valve 7 and the other end connected to the PLC controller. Based on the indication from the liquid level gauge 5, the PLC controller 11 controls the built-in lifting cable 12 to lift the gasket inside the modified three-way valve 7, thereby controlling the downward flow of the digester liquid in the acid production buffer chamber to the methanogenic chamber 3, thus satisfying the difference in hydraulic residence time between hydrolysis acidification and methanogenic processes.

[0053] The first gas collection pipeline 23 and the second gas collection pipeline 18 are respectively arranged at the top of the hydrolysis acidification chamber and the methanogenic chamber 3, and are connected to the gas flow meter 24 to collect the gas from the two chambers. The gas return pipeline 21 is connected to the outlet end of the gas flow meter 24, and the gas return speed and time are controlled by the gas pump 22. Finally, the gas distribution device 2 returns the biogas to stir the gas in the methanogenic chamber 3.

[0054] The particulate matter sedimentation zone is located in the methanogenic zone. A baffle 14 separates the particulate matter sedimentation zone from the methanogenic chamber 3. A baffle 17 is installed on the main reactor wall, above the particulate matter sedimentation zone, forming a flow channel with the baffle to prevent the passage of particulate matter. When sample is introduced into the methanogenic chamber 3, its supernatant is discharged through the overflow outlet 16. The particulate matter sedimentation zone outlet 13 can recover the precipitated particulate matter.

[0055] The specific operating steps using the above-mentioned device are as follows:

[0056] (1) Complete the connection of this device according to the requirements of the installation key points, check the airtightness of the device, and seal the pipe connection with airtight glue.

[0057] (2) Select anaerobic sludge from a well-functioning biogas digester as inoculum. Prepare a nutrient solution to meet the needs of various functional microorganisms. The nutrient solution includes: NH4Cl, NaCl, MgCl2·6H2O, CaCl2·2H2O, FeCl3·6H2O, CoCl2·6H2O, NiCl2·6H2O, K2HPO4, and KH2PO4.

[0058] (3) When the reactor is started, the inoculum and nutrient solution of the hydrolysis acidification chamber 20 are replenished through the inlet 10 of the hydrolysis acidification chamber, and the digest liquid level of the hydrolysis acidification chamber 20 reaches the overflow height, and the pH range is adjusted to 5.5-6.5; the inoculum, nutrient solution and exogenous particulate matter of a predetermined concentration in the methanogenesis chamber 3 are replenished through the inlet of the inlet and outlet 6 of the acid production buffer zone, so that the digest liquid level of the methanogenesis chamber 3 is higher than the height of the overflow outlet 16, and the pH range is controlled to 6.8-7.2.

[0059] (4) During reactor operation, the digestion liquid in the hydrolysis acidification chamber and the methanogenic chamber is fully mixed by using the stirring device 25 and the gas reflux stirring system in an intermittent stirring manner.

[0060] (5) Dispose of the hydrolysis liquid sample through the discharge port 8 of the hydrolysis acidification chamber and the discharge port 1 of the methanogenic chamber, and monitor the various water quality indicators of the hydrolysis acidification chamber and the methanogenic chamber.

[0061] (6) Before injection, turn off the stirring device 25 and inject the sample through the hydrolysis acidification chamber inlet 10. The digestion liquid in the hydrolysis acidification chamber 20 overflows into the acid production buffer chamber 19.

[0062] (7) The water quality conditions of the acid-producing buffer chamber 19 are monitored by removing the liquid sample from the inlet and outlet of the acid-producing buffer zone 6. At the same time, the pH and other conditions of the water quality are adjusted through the inlet of the inlet and outlet of the acid-producing buffer zone 6 to meet the growth environment requirements of methanogens.

[0063] (8) Before injecting the sample into the methanogenic chamber 3, turn off the gas reflux stirring system and let the digestion liquid settle. Open the overflow discharge port 16 valve to allow the supernatant of the digestion liquid to overflow and be discharged. Then close the overflow discharge port 16 valve. The particulate matter is precipitated in the particulate matter settling zone 15 and the particulate matter is recovered through the particulate matter settling zone discharge port 13.

[0064] (9) After the liquid level in the methanogenic chamber 3 drops, the PLC controller 11 controls the built-in lifting line 12 according to the indication of the liquid level gauge 5 to lift the gasket in the improved three-way valve 7, and controls the digestion liquid in the acid production buffer chamber 19 to flow down into the methanogenic chamber 3, thereby satisfying the difference in hydrolysis acidification and methanogenic hydraulic residence time.

[0065] (10) The first gas collecting pipeline 23 and the second gas collecting pipeline 18 are respectively connected to the gas flow meter 24 to collect the gas from the hydrolysis acidification chamber 20 and the methanogenic chamber 3.

[0066] (11) Specifically, when the total solids (TS) concentration in the hydrolysis acidification chamber 20 and the methanogenic chamber 3 is too high, the digestate is discharged through the discharge port 8 of the hydrolysis acidification chamber and the discharge port 1 of the methanogenic chamber in a timely manner, and the nutrient solution is used to replenish the corresponding liquid level.

[0067] (12) In particular, when solids are discharged from the methanogenic chamber 3, the corresponding amount of external particulate matter should be added to maintain the uniform particulate matter concentration in the methanogenic chamber.

[0068] The embodiments described above are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this application without creative effort should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims in this application.

Claims

1. A two-phase integrated anaerobic digestion and exogenous particulate matter recycling device, characterized in that, The device includes a main reactor, an online liquid level control system, a gas collection system, and a gas reflux stirring system; The main reactor contains a hydrolysis acidification zone, an acid production buffer zone, and a methanogenic zone; The hydrolysis acidification zone is equipped with a hydrolysis acidification chamber (20), a stirring device (25), a hydrolysis acidification chamber discharge port (8), and a hydrolysis acidification chamber inlet (10); the acid production buffer zone includes an acid production buffer chamber (19), an improved three-way valve (7), and acid production buffer zone inlet and outlet ports (6); the methanogenic zone includes a methanogenic chamber discharge port (1), a gas distribution device (2), a methanogenic chamber (3), a PVC connecting pipe (4), a particulate matter settling zone (15), an overflow discharge port (16), a partition (14), a particulate matter settling zone discharge port (13), a baffle (17), and a sludge discharge port (26); the online liquid level control system includes a liquid level gauge (5), a built-in lifting line (12), and a hollow tube (9); The hydrolysis acidification chamber (20) is cylindrical, located at the top of the acid production buffer zone, and sealed at the bottom, with the supernatant overflowing from the top; the acid production buffer chamber (19) includes the spacer area between the hydrolysis acidification chamber (20) and the main reactor and the triangular pyramidal area at the bottom of the hydrolysis acidification chamber (20); the improved three-way valve (7) is connected to the hydrolysis acidification chamber (20) at the top, to a straight pipe at the bottom, and to a sample discharge pipe in the middle; the improved three-way valve (7) contains a gasket; The gasket is wider at the top and narrower at the bottom, forming a seal with the bottom thread of the improved three-way valve (7) to prevent water from seeping down from the top. The online liquid level control system includes a PLC controller (11), which is connected to the liquid level gauge (5) and the built-in lifting line (12) respectively. The built-in lifting line (12) is placed inside the hollow tube (9), with one end connected to the gasket inside the improved three-way valve (7) and the other end connected to the PLC controller (11). The PLC controller (11) controls the built-in lifting line (12) according to the indication of the level gauge (5) to lift the gasket in the improved three-way valve (7) and control the digestion liquid in the acid production buffer chamber (19) to seep down into the methanogenic chamber (3). The gas collection system is provided with a first gas collection pipeline (23), a second gas collection pipeline (18), and a gas flow meter (24). The gas flow meter (24) is connected to the first gas collection pipeline (23) and the second gas collection pipeline (18) respectively. The first gas collection pipeline (23) and the second gas collection pipeline (18) are respectively arranged at the top of the hydrolysis acidification chamber (20) and the methanogenic chamber (3), and are connected to the gas flow meter (24). The gas reflux stirring system includes a gas reflux pipeline (21), a gas pump (22), and a gas distribution device (2); the gas reflux pipeline (21) is connected to the outlet end of a gas flow meter (24), and the other end is connected to the gas distribution device in the methanogenic chamber (3); The particulate matter settling zone (15) is located in the methanogenic zone, and the particulate matter settling zone (15) and the methanogenic chamber (3) are separated by a baffle (14); the baffle (17) is located on the main reactor wall, above the particulate matter settling zone (15), and forms a flow channel with the baffle (14) to reduce the passage of particulate matter and prevent the particulate matter from flowing back.

2. The two-phase integrated anaerobic digestion and exogenous particulate matter recycling device according to claim 1, characterized in that, The acid-producing buffer chamber (19) receives the overflow liquid from the hydrolysis acidification chamber (20). The volume of the acid-producing buffer chamber (19) is 2-3 times larger than the maximum feed volume of the hydrolysis acidification chamber (20). An improved three-way valve (7) is connected to its bottom.

3. The two-phase integrated anaerobic digestion and exogenous particulate matter recycling device according to claim 1, characterized in that, The inlet and outlet ports (6) of the acid-producing buffer zone are connected to the improved three-way valve (7). The water quality conditions of the acid-producing buffer chamber (19) are monitored by taking samples from the outlet portion of the inlet and outlet ports (6) of the acid-producing buffer zone. NaHCO3 is added to the water inlet (10) of the hydrolysis acidification chamber to adjust the pH.

4. The two-phase integrated anaerobic digestion and exogenous particulate matter recycling device according to claim 1, characterized in that, The level gauge (5) is at a height higher than the overflow outlet (16) of the methanogenic chamber.

5. The application of the two-phase integrated anaerobic digestion and exogenous particulate matter recycling device as described in claim 1, characterized in that, The two-phase integrated anaerobic digestion and exogenous particulate matter recycling device described above achieves phase separation of hydrolysis acidification and methanogenesis in the same reactor, and regulates the water quality of the fermentation broth produced in the hydrolysis acidification stage to meet the growth requirements of methanogenic bacteria, maintain the stability of the anaerobic digestion system, and improve the treatment efficiency of organic waste.

6. The application according to claim 5, characterized in that, The two-phase integrated anaerobic digestion and exogenous particulate matter recycling device described above is used to intercept and recover exogenous particulate matter, including the following steps: When the reactor is started, the inoculum and nutrient solution of the hydrolysis acidification chamber (20) are replenished through the inlet (10) of the hydrolysis acidification chamber, and the digest liquid level of the hydrolysis acidification chamber (20) reaches the overflow height, and the pH range is adjusted to 5.5-6.5; the inlet of the inlet and outlet (6) of the acid production buffer zone is replenished with the inoculum and exogenous particulate matter of the nutrient solution in the methanogenesis chamber (3), so that the digest liquid level of the methanogenesis chamber (3) is higher than the height of the overflow outlet (16), and the pH range is controlled to 6.8-7.

2. During reactor operation, the digestate in the hydrolysis acidification chamber and the methanogenic chamber is fully mixed by using the stirring device (25) and the gas reflux stirring system in an intermittent stirring manner; The hydrolysis acidification chamber discharge port (8) and the methanogenic chamber discharge port (1) were used to discharge the hydrolysis liquid samples respectively, and the water quality indicators of the hydrolysis acidification chamber and the methanogenic chamber were monitored. Before injection, turn off the stirring device (25) and inject the sample through the injection port (10) of the hydrolysis acidification chamber. The digestion liquid in the hydrolysis acidification chamber (20) overflows into the acid production buffer chamber (19). The water quality conditions of the acid-producing buffer chamber (19) are monitored by removing the liquid sample from the outlet part of the inlet and outlet of the acid-producing buffer zone (6). At the same time, the pH conditions of the water quality are adjusted by the inlet part of the inlet and outlet of the acid-producing buffer zone (6) to meet the growth environment requirements of methanogens. Before the sample is injected into the methanogenic chamber (3), the gas reflux stirring system is turned off and the digestion liquid is allowed to settle. The overflow discharge port (16) valve is opened and the supernatant of the digestion liquid overflows and is discharged. The overflow discharge port (16) valve is then closed. The particulate matter is settled in the particulate matter settling zone (15) and the particulate matter is recovered through the particulate matter settling zone discharge port (13). After the liquid level in the methanogenic chamber (3) drops, the PLC controller (11) controls the built-in lifting line (12) according to the indication of the liquid level gauge (5) to lift the gasket in the improved three-way valve (7) and control the digestion liquid in the acid production buffer chamber (19) to flow down into the methanogenic chamber (3), thereby satisfying the difference in hydrolysis acidification and methanogenic hydraulic residence time; The first gas collection line (23) and the second gas collection line (18) are connected to the gas flow meter (24) respectively, and are used to collect the gas from the hydrolysis acidification chamber (20) and the methanogenic chamber (3).

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