High efficiency rotary mixed flow anaerobic bioreactor

Abstract

The utility model relates to anaerobic bioreactor technical field, concretely for efficient rotation mixes flow anaerobic bioreactor, including the casing, the inside of casing is formed with rotation mixes flow area, first anaerobic area, first layer sludge water gas three -phase separation area, second anaerobic area, second layer sludge water gas three -phase separation area and clarification zone from bottom to top, the top of casing is provided with steam -water separator, and is provided with marsh gas inner circulation structure between steam -water separator and rotation mixes flow area, and is provided with gas collection structure between steam -water separator and first layer sludge water gas three -phase separation area and second layer sludge water gas three -phase separation area, and the side wall bottom of casing is provided with water inlet main pipe, and water inlet main pipe extends to the inside of casing and is provided with water inlet water distribution structure, and is provided with outer circulation backflow structure between first anaerobic area, second anaerobic area and water inlet main pipe, the beneficial effects of the utility model are that through a large amount of circulating water dilution harmful substance, reduce toxic influence, enhance anaerobic digestion shock resistance, improve the rising velocity, speed up the processing effect.

Description

Technical Field

[0001] This utility model relates to the field of anaerobic bioreactor technology, specifically a high-efficiency swirling flow anaerobic bioreactor. Background Technology

[0002] The advantages of anaerobic treatment for high-concentration, recalcitrant organic wastewater have gradually gained recognition and attention. In recent years, anaerobic technology has developed rapidly, with main types including upflow anaerobic bacterial bed reactors (UASB) and anaerobic baffled reactors (ABR).

[0003] UASB Introduction: The UASB reactor features a gas-solid-liquid three-phase separator at the top, and a colony suspension zone and colony bed zone at the bottom. Wastewater is uniformly pumped into the colony bed zone from the bottom of the reactor, where it fully contacts and reacts with the anaerobic colonies. Organic matter is decomposed into biogas by the anaerobic microorganisms. The liquid, gas, and solid mixture rises to the three-phase separator, where they are effectively separated, allowing some of the organic matter to be converted into biogas, thus completing the wastewater treatment process.

[0004] An anaerobic baffled reactor (ABR) is a novel type of anaerobic reactor developed based on the UASB (Ultra-Anaerobic Blender). The ABR uses a series of vertically installed baffles to cause the wastewater to flow vertically along these baffles within the reactor. The biogas produced during treatment causes anaerobic bacteria to expand and settle within the compartments formed by the baffles, while the overall water flow within the reactor is relatively slow and horizontal. The wastewater's path within the reactor increases due to the baffles, and combined with the baffles' obstruction and bacterial settling, anaerobic bacteria are trapped within the reactor, thus removing organic pollutants.

[0005] Existing wastewater treatment systems have the following drawbacks:

[0006] 1. Uneven mixing of mud and water at the bottom of the reactor makes it easy for bacterial colonies to settle at the bottom, causing bacterial crust formation inside the reactor.

[0007] 2. It is sensitive to sudden changes in water quality and load, has low resistance to shock loads, and its colonies are prone to acidification, resulting in decreased treatment efficiency. If anaerobic treatment is not performed properly, the organic load will be very high, which will seriously affect the normal operation of the next stage.

[0008] 3. Microorganisms grow slowly and have a long start-up period.

[0009] 4. Short-circuiting occurs within the UASB colony bed, affecting processing capacity.

[0010] 5. The microbial mass transfer efficiency is low, the volumetric loading rate is low, and the treatment efficiency needs to be improved. Utility Model Content

[0011] The purpose of this invention is to provide a high-efficiency swirling anaerobic bioreactor to solve the problems mentioned in the background art.

[0012] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency swirling mixed-flow anaerobic bioreactor, comprising a shell, wherein the shell contains, from bottom to top, a swirling mixed-flow zone, a first anaerobic zone, a first layer of mud-water-gas three-phase separation zone, a second anaerobic zone, a second layer of mud-water-gas three-phase separation zone, and a clarification zone; a gas-water separator is provided at the top of the shell; a biogas internal circulation structure is provided between the gas-water separator and the swirling mixed-flow zone; a gas collection structure is provided between the gas-water separator and the first and second layers of mud-water-gas three-phase separation zones; a water inlet main pipe is provided at the bottom of the side wall of the shell; the water inlet main pipe extends into the shell and is provided with a water inlet distribution structure; and an external circulation reflux structure is provided between the first and second anaerobic zones and the water inlet main pipe.

[0013] The present invention is further configured such that the external circulation return structure includes a circulation riser, the top end of the circulation riser is provided with an external circulation water absorption structure, and the bottom end is connected to the main water inlet pipe.

[0014] The present invention is further configured such that the external circulation water suction structure includes a first water suction pipe and a second water suction pipe, both of which are connected and disposed on the circulation riser. The first water suction pipe extends into the interior of the shell and is located below the first layer of mud-water-gas three-phase separation zone, and the second water suction pipe extends into the interior of the shell and is located below the second layer of mud-water-gas three-phase separation zone.

[0015] The present invention is further configured such that the water inlet and water distribution structure includes a conical water distributor, the conical water distributor is evenly distributed inside the shell and located at the upper end of the swirling flow zone, the main water inlet extends into the shell and is equipped with a water distribution riser in conjunction with each conical water distributor.

[0016] The present invention is further configured such that a first three-phase separator is provided in the first layer mud-water-gas three-phase separation zone, and a second three-phase separator is provided in the second layer mud-water-gas three-phase separation zone.

[0017] The present invention is further configured such that the biogas internal circulation structure includes a descending main pipe, the descending main pipe is located at the bottom end of the gas-water separator, a water distributor is located at the bottom end of the descending main pipe, and a descending branch pipe is provided between the water distributor and each conical water distributor.

[0018] The present invention is further configured such that the gas collection structure includes a first riser pipe and a second riser pipe, the first riser pipe being located above the first three-phase separator and connected to the bottom of the steam-water separator, and the second riser pipe being located above the second three-phase separator and connected to both sides of the steam-water separator.

[0019] The present invention is further configured such that a water outlet weir is provided on the side of the clarification zone, an exhaust pipe is provided at the top of the steam-water separator, and a sewage pipe is provided at the bottom of the shell.

[0020] The present invention is further configured such that the conical water distributor includes a conical cover, an annular water distribution pipe is provided inside the conical cover, the descending branch pipe and the water distribution riser are both connected to the annular water distribution pipe, and multiple water distribution nozzles are provided on the annular water distribution pipe at a horizontal and downward inclination. The conical cover is provided with a stirring structure in conjunction with the water distribution nozzles.

[0021] The present invention is further configured such that the stirring structure includes a fixed frame, the fixed frame is installed at the bottom of the conical cover, a fixed seat is provided in the middle of the fixed frame, a rotating shaft is installed on the fixed seat through a sealed bearing, the top end of the rotating shaft extends into the annular water distribution pipe and is provided with a lower guide impeller, and the bottom end is provided with an upper guide impeller.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. Strong resistance to load shock: This utility model uses its own generated sewage to be pumped to the inlet main pipe. The large amount of circulating water and inlet water are fully mixed, which makes the harmful substances in the sewage fully diluted, greatly reducing the impact of toxins on the anaerobic digestion process and ensuring that the reactor can withstand high load shocks.

[0024] 2. Uniform mixing of mud and water, resulting in higher treatment efficiency: The mixing of influent and circulating water in the reactor increases the potential energy generated by the influent, directly causing a swirling flow at the bottom of the shell, which fully mixes the wastewater with the microbial carrier, further improving the reactor's treatment efficiency.

[0025] 3. High volumetric loading: The reactor has a high colony concentration and a large amount of microorganisms. It also has internal circulation, resulting in good mass transfer. The organic load of the influent can exceed four times that of ordinary anaerobic reactors.

[0026] 4. Reduced investment and floor space: The high-efficiency swirling mixed-flow anaerobic bioreactor has a volumetric loading rate approximately four times higher than that of a conventional UASB reactor, and its surface area is equivalent to about 1 / 4 to 1 / 3 of that of a conventional reactor, significantly reducing the infrastructure investment required for the reactor. Furthermore, its high height-to-diameter ratio (typically 4-8) results in a particularly small footprint, making it ideal for wastewater treatment in areas with limited land.

[0027] 5. Strong resistance to low temperatures: The effect of temperature on anaerobic digestion is mainly its effect on the digestion rate. Because anaerobic bioreactors contain a large number of microorganisms, the effect of temperature on anaerobic digestion becomes less significant and severe. Anaerobic digestion can usually be carried out at ambient temperature (20–25℃), thus reducing the difficulty of maintaining the digestion temperature and saving energy.

[0028] 6. It has the ability to buffer pH: The internal circulation flow rate is equivalent to the effluent recirculation of the first anaerobic zone. The decomposition of COD by anaerobic microorganisms can be converted into alkalinity, which plays a buffering role in pH, keeping the pH in the reactor at the optimal state, and at the same time reducing the amount of alkali added to the influent.

[0029] 7. Internal automatic circulation, no external power required: The anaerobic reactor uses the gas it generates as the power source to achieve internal circulation of the mixed liquid, eliminating the need for a pump to force circulation and saving power consumption.

[0030] 8. Short start-up period: The high bacterial activity and rapid biological proliferation within the anaerobic reactor provide favorable conditions for rapid reactor start-up. The start-up period for an anaerobic reactor is generally 1 to 3 months.

[0031] 9. Good water output stability and simple operation.

[0032] 10. High biogas utilization value: The biogas produced by the reactor has high purity; on the one hand, biogas can be used to sweep away dead corners of the colony, avoid the deposition of colonies, and improve the treatment efficiency of the reactor; on the other hand, it can be recycled as fuel. Attached Figure Description

[0033] Figure 1 This is a two-dimensional planar schematic diagram of the overall structure of the high-efficiency swirling anaerobic bioreactor of this utility model;

[0034] Figure 2 This is a three-dimensional view of the overall structure of this utility model;

[0035] Figure 3 This is a cross-sectional view of the overall three-dimensional structure of this utility model;

[0036] Figure 4 This is a schematic diagram of the cooperative structure between the conical water distributor, the steam-water separator, the first three-phase separator, the second three-phase separator, the first suction pipe, the second suction pipe, the circulating riser, and the main inlet pipe in this utility model.

[0037] Figure 5 This is a schematic diagram of the overall structure of the conical water distributor in this utility model;

[0038] Figure 6 This is a cross-sectional view of the overall structure of the conical water distributor in this utility model.

[0039] The components represented by each number in the attached diagram are listed below: 1. Shell; 2. Swirling flow zone; 3. First anaerobic zone; 4. First sludge-water-gas three-phase separation zone; 5. Second anaerobic zone; 6. Second sludge-water-gas three-phase separation zone; 7. Clarification zone; 8. Gas-water separator; 9. Main inlet pipe; 10. Circulation riser; 11. First suction pipe; 12. Second suction pipe; 13. Conical water distributor; 14. Water distribution riser; 15. First... 16. Three-phase separator; 17. Second three-phase separator; 18. Downward main pipe; 19. Water distributor; 20. Downward branch pipe; 21. First riser pipe; 22. Second riser pipe; 23. Outlet weir; 24. Exhaust pipe; 25. Sewage pipe; 26. Conical cover; 27. Annular water distribution pipe; 28. Water distribution nozzle; 29. ​​Fixing frame; 30. Fixing base; 31. Rotating shaft; 32. Lower guide impeller; 33. Upper guide impeller. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] This utility model provides a technical solution: Please refer to Figures 1-6 A high-efficiency swirling mixed-flow anaerobic bioreactor includes a shell 1. Inside the shell 1, from bottom to top, there are a swirling mixed-flow zone 2, a first anaerobic zone 3, a first layer of mud-water-gas three-phase separation zone 4, a second anaerobic zone 5, a second layer of mud-water-gas three-phase separation zone 6, and a clarification zone 7. A gas-water separator 8 is installed at the top of the shell 1. A biogas internal circulation structure is set between the gas-water separator 8 and the swirling mixed-flow zone 2. A gas collection structure is set between the gas-water separator 8 and the first layer of mud-water-gas three-phase separation zone 4 and the second layer of mud-water-gas three-phase separation zone 6. A water inlet main pipe 9 is set at the bottom of the side wall of the shell 1. The water inlet main pipe 9 extends into the shell 1 and is equipped with a water inlet distribution structure. An external circulation return structure is set between the first anaerobic zone 3, the second anaerobic zone 5, and the water inlet main pipe 9.

[0042] The external circulation return structure includes a circulation riser 10, with an external circulation water suction structure at the top and the bottom end connected to the main water inlet 9.

[0043] Furthermore, the external circulation water intake structure includes a first water intake pipe 11 and a second water intake pipe 12. Both the first water intake pipe 11 and the second water intake pipe 12 are connected and installed on the circulation riser 10. The first water intake pipe 11 extends into the interior of the shell 1 and is located below the first layer of mud-water-gas three-phase separation zone 4. The second water intake pipe 12 extends into the interior of the shell 1 and is located below the second layer of mud-water-gas three-phase separation zone 6. Through the first water intake pipe 11 and the second water intake pipe 12, the water flow in the first anaerobic zone 3 and the second anaerobic zone 5 can be absorbed and transported to the circulation riser 10, and then transported to the inlet main pipe 9 through the circulation riser 10, so as to achieve the mixing of a large amount of circulating water and inlet water.

[0044] Please see Figures 1-6 As one implementation of the water inlet and water distribution structure: the water inlet and water distribution structure includes a conical water distributor 13, which is evenly distributed inside the housing 1 and located at the upper end of the swirling mixing zone 2. The main water inlet pipe 9 extends into the housing 1 and is equipped with a water distribution riser 14 in conjunction with each conical water distributor 13.

[0045] This utility model has a first three-phase separator 15 installed in the first layer mud-water-gas three-phase separation zone 4, and a second three-phase separator 16 installed in the second layer mud-water-gas three-phase separation zone 6.

[0046] Please see Figures 1-6 As one implementation of the biogas internal circulation structure: the biogas internal circulation structure includes a downpipe 17, which is located at the bottom of the gas-water separator 8. A water distributor 18 is located at the bottom of the downpipe 17, and a downpipe branch pipe 19 is provided between the water distributor 18 and each conical water distributor 13.

[0047] Please see Figures 1-6 As one implementation of the gas collection structure: the gas collection structure includes a first riser pipe 20 and a second riser pipe 21. The first riser pipe 20 is located above the first three-phase separator 15 and is connected to the bottom of the steam-water separator 8. The second riser pipe 21 is located above the second three-phase separator 16 and is connected to both sides of the steam-water separator 8.

[0048] In this invention, a water outlet weir 22 is provided on the side of the clarification zone 7, an exhaust pipe 23 is provided at the top of the steam-water separator 8, and a sewage pipe 24 is provided at the bottom of the shell 1.

[0049] The conical water distributor 13 of this utility model includes a conical cover 25, inside which is an annular water distribution pipe 26. A descending branch pipe 19 and a water distribution riser pipe 14 are both connected to the annular water distribution pipe 26. Multiple water distribution nozzles 27 are arranged horizontally and downwardly on the annular water distribution pipe 26. A stirring structure is provided inside the conical cover 25 in conjunction with the water distribution nozzles 27. The stirring structure includes a fixing frame 28, which is installed at the bottom of the conical cover. A fixing seat 29 is provided in the middle of the fixing frame 28. A rotating shaft 30 is installed on the fixing seat 29 through a sealed bearing. The top end of the rotating shaft 30 extends into the annular water distribution pipe 26 and is provided with a lower guide impeller 31, and the bottom end is provided with an upper guide impeller 32. Through the above structure, the water flow and anaerobic colonies can be fully stirred and mixed, thereby improving the decomposition efficiency of anaerobic bacteria on organic matter in sewage.

[0050] In summary, the working principle and specific workflow of this utility model are as follows:

[0051] In use, the wastewater is transported to the inside of the housing 1 through the water inlet pipe 9 and then to the conical water distributor 13 through the water distribution riser 14 to achieve uniform spraying.

[0052] The bottom of the swirling mixing zone 2 is the colony bed zone. After the sewage is evenly sprayed out through the cone-shaped water distributor 13, it will impact the colony bed zone and fully contact and react with the anaerobic colonies. The organic matter is decomposed by the anaerobic microorganisms, continuously producing a large amount of biogas. The liquid, gas and solid form a mixed liquid flow that rises sequentially to the first three-phase separator 15 and the second three-phase separator 16.

[0053] The baffles in the first three-phase separator 15 cause the wastewater to flow up and down along the baffles in the reactor. With the help of the biogas generated in the reactor during the treatment process, the anaerobic bacteria expand and settle in the compartments formed by the baffles. Meanwhile, the water flow in the entire reactor flows horizontally at a slower speed. Under the action of the baffles, the water flow around the baffles, which increases the total length of the water flow path in the reactor. In addition, the baffles block the flow and the sedimentation of the bacteria, so the anaerobic bacteria are trapped in the reactor, thus completing the removal of organic pollutants and forming a bacterial suspension layer below the shell 1.

[0054] The second three-phase separator 16 operates on the same principle as the first three-phase separator 15, thereby enhancing the above process and improving the wastewater treatment effect.

[0055] During the above process, the biogas produced by the reaction will be collected by gravity and flow to the first riser pipe 20 and the second riser pipe 21 under the action of the gas collection chamber in the first three-phase separator 15 and the second three-phase separator 16, and the biogas will be discharged through the exhaust pipe 23 in the gas-water separator 8. The biogas water will be redirected to the conical water distributor 13 through the biogas internal circulation structure.

[0056] During this process, biogas water flows through the downpipe 17 to the distributor 18, and is then transported to the cone-shaped water distributor 13 through the cooperation of the distributor 18 and the downpipe 19.

[0057] In the above process, the gas produced by the reaction can increase the gas pressure inside the shell 1, so that the water flow in the upper layer of the first anaerobic zone 3 and the second anaerobic zone 5 can be pumped down to the circulation riser 10 through the first water suction pipe 11 and the second water suction pipe 12 respectively, and then pumped to the main water inlet pipe 9 through the circulation riser 10. The main water inlet pipe 9 further pumps the water to the distribution riser 14. The cooperation between the distribution riser 14 and the conical water distributor 13 makes the circulating water and the inlet water fully mixed.

[0058] Thus, the water inlet pipe 9 and the biogas water in the circulating riser 10, as well as the biogas water in the internal circulation return, are simultaneously delivered to the conical water distributor 13, so as to achieve uniform swirling and mixing of biogas water and water inlet.

[0059] In this process, the wastewater generated by this invention is pumped to the inlet main pipe 9, and a large amount of circulating water and inlet water are fully mixed, so that the harmful substances in the wastewater are fully diluted, greatly reducing the impact of toxins on the anaerobic digestion process and ensuring that the reactor can withstand high load impacts.

[0060] During this process, the water flow delivered to the conical water distributor 13 through the downcomer 19 and the water distribution riser 14 will enter the annular water distribution pipe 26 and be sprayed out at an angle through the water distribution nozzle 27 on the annular water distribution pipe 26. Under the impact of the water flow, the lower guide impeller 31 will rotate automatically. At the same time, through the cooperation of the lower guide impeller 31, the rotating shaft 30 and the upper guide impeller 32, the upper guide impeller 32 can be automatically flipped, so as to fully agitate the anaerobic colonies below. This can prevent the anaerobic bacteria from settling in the swirling flow zone 2.

[0061] Meanwhile, the upper guide impeller 32 allows anaerobic bacteria to be stirred upwards, making full contact with the downward-flowing sewage, thus improving the adequacy of the degradation of organic matter in the sewage by anaerobic bacteria.

[0062] After the reaction, the supernatant can be discharged through the effluent weir 22, and the finally separated sludge can be slowly discharged along the sewage pipe 24 under the action of gravity.

[0063] In this invention, all pipe structures can be opened and closed by valves.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0065] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency swirling mixed-flow anaerobic bioreactor, comprising a shell (1), wherein the shell (1) contains, from bottom to top, a swirling mixed-flow zone (2), a first anaerobic zone (3), a first layer of mud-water-gas three-phase separation zone (4), a second anaerobic zone (5), a second layer of mud-water-gas three-phase separation zone (6), and a clarification zone (7), wherein a gas-water separator (8) is provided at the top of the shell (1), characterized in that: A biogas internal circulation structure is provided between the gas-water separator (8) and the swirling mixing zone (2). A gas collection structure is provided between the gas-water separator (8) and the first layer of mud-water-gas three-phase separation zone (4) and the second layer of mud-water-gas three-phase separation zone (6). A water inlet pipe (9) is provided at the bottom of the side wall of the shell (1). The water inlet pipe (9) extends into the shell (1) and is provided with a water inlet distribution structure. An external circulation return structure is provided between the first anaerobic zone (3), the second anaerobic zone (5) and the water inlet pipe (9).

2. The high-efficiency swirling-flow anaerobic bioreactor according to claim 1, characterized in that: The external circulation return structure includes a circulation riser (10), the top of which is provided with an external circulation water absorption structure, and the bottom end is connected to the main water inlet pipe (9).

3. The high-efficiency swirling flow anaerobic bioreactor according to claim 2, characterized in that: The external circulation water absorption structure includes a first water suction pipe (11) and a second water suction pipe (12). The first water suction pipe (11) and the second water suction pipe (12) are both connected and installed on the circulation riser (10). The first water suction pipe (11) extends into the shell (1) and is located below the first layer of mud-water-gas three-phase separation zone (4). The second water suction pipe (12) extends into the shell (1) and is located below the second layer of mud-water-gas three-phase separation zone (6).

4. The high-efficiency swirling-flow anaerobic bioreactor according to claim 1, characterized in that: The water inlet and distribution structure includes a conical water distributor (13), which is evenly distributed inside the shell (1) and located at the upper end of the swirling flow zone (2). The main water inlet pipe (9) extends into the shell (1) and is equipped with a water distribution riser (14) in conjunction with each conical water distributor (13).

5. The high-efficiency swirling-flow anaerobic bioreactor according to claim 1, characterized in that: A first three-phase separator (15) is provided in the first layer mud-water-gas three-phase separation zone (4), and a second three-phase separator (16) is provided in the second layer mud-water-gas three-phase separation zone (6).

6. The high-efficiency swirling-flow anaerobic bioreactor according to claim 4, characterized in that: The biogas internal circulation structure includes a downpipe (17), which is located at the bottom of the gas-water separator (8). A water distributor (18) is located at the bottom of the downpipe (17), and a downpipe branch (19) is provided between the water distributor (18) and each conical water distributor (13).

7. The high-efficiency swirling flow anaerobic bioreactor according to claim 5, characterized in that: The gas collection structure includes a first riser pipe (20) and a second riser pipe (21). The first riser pipe (20) is located above the first three-phase separator (15) and is connected to the bottom of the steam-water separator (8). The second riser pipe (21) is located above the second three-phase separator (16) and is connected to both sides of the steam-water separator (8).

8. The high-efficiency swirling flow anaerobic bioreactor according to claim 1, characterized in that: The clarification zone (7) is provided with a water outlet weir (22) on its side, the top of the steam-water separator (8) is provided with an exhaust pipe (23), and the bottom of the shell (1) is provided with a sewage pipe (24).

9. The high-efficiency swirling flow anaerobic bioreactor according to claim 6, characterized in that: The conical water distributor (13) includes a conical cover (25), and an annular water distribution pipe (26) is provided inside the conical cover (25). The descending branch pipe (19) and the water distribution riser pipe (14) are both connected to the annular water distribution pipe (26). Multiple water distribution nozzles (27) are provided on the annular water distribution pipe (26) at a horizontal and downward inclination. The conical cover (25) is provided with a stirring structure in cooperation with the water distribution nozzles (27).

10. The high-efficiency swirling-flow anaerobic bioreactor according to claim 9, characterized in that: The stirring structure includes a fixed frame (28), which is installed at the bottom of the conical cover (25). A fixed seat (29) is provided in the middle of the fixed frame (28). A rotating shaft (30) is installed on the fixed seat (29) through a sealed bearing. The top end of the rotating shaft (30) extends into the annular water distribution pipe (26) and is provided with a lower guide impeller (31), and the bottom end is provided with an upper guide impeller (32).

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