Anaerobic reactor and anaerobic reaction system

Abstract

The utility model discloses an anaerobic reactor and anaerobic reaction system, including anaerobic reaction bucket body, the bucket cover of being located at the upper end bucket mouth department of anaerobic reaction bucket body, be equipped with rotating shaft's agitator, screen and water baffle, anaerobic reaction bucket body is equipped with the water inlet and water outlet of valve, the water inlet is close to the bottom of anaerobic reaction bucket body, the water outlet is close to the top of anaerobic reaction bucket body, screen and water baffle all are located in the inside of anaerobic reaction bucket body, and screen is located below water baffle, and the anaerobic reaction space between water inlet and water outlet is formed by cooperation, the agitator is connected with the bucket cover, passes through water baffle and extends into anaerobic reaction space. The utility model has the advantages of high mass transfer efficiency, can avoid the expansion of packing and block the water outlet.

Description

Technical Field

[0001] This utility model relates to the technical field of anaerobic reaction equipment, and in particular to an anaerobic reactor and an anaerobic reaction system. Background Technology

[0002] The high COD (Chemical Oxygen Demand) and high toxicity of petroleum hydrocarbon wastewater (such as cutting fluid wastewater) necessitate anaerobic biological treatment. However, existing anaerobic reactors have long suffered from the following drawbacks in actual operation, severely limiting the system's treatment efficiency, stability, and maintainability: 1. Low mass transfer efficiency Traditional anaerobic reactors generally operate statically or rely solely on the natural upward flow of water, without any controllable and stable mechanical stirring devices. This makes it difficult for the microbial biofilm and petroleum hydrocarbons to mix thoroughly, easily creating "dead zones" at the bottom or in corners, leading to decreased treatment efficiency and sludge deposition.

[0003] 2. Packing material expansion blocks the outlet. To increase the retention of microorganisms, it is common practice in engineering to fill reactors with packing materials such as sponges, suspended balls, or soft fibers as immobilization carriers for anaerobic petroleum hydrocarbon-degrading bacteria. During long-term operation, these packing materials expand in volume by 20%–60% due to oil and water absorption and biofilm thickening, eventually squeezing and clogging the outlet, causing the liquid level to rise and the anaerobic reactor to overflow.

[0004] 3. Fixed screen makes cleaning difficult. In existing designs, the screens used to support the packing material and filter are typically welded and fixed to the inner wall of the reactor. After the anaerobic reactor is shut down, workers cannot directly access the space below the screens, making cleaning difficult.

[0005] Therefore, there is an urgent need for a new type of anaerobic reactor that combines high-efficiency mass transfer, anti-clogging, and easy cleaning to meet the long-term, continuous, and stable treatment requirements of high-concentration petroleum hydrocarbon wastewater. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an anaerobic reactor with high mass transfer efficiency that can avoid packing expansion and blockage of the outlet.

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows: An anaerobic reactor includes an anaerobic reaction tank, a lid located at the top opening of the anaerobic reaction tank, a stirrer with a rotating shaft, a screen, and a water-passing baffle. The anaerobic reaction tank is equipped with an inlet and an outlet with valves; The water inlet is located near the bottom of the anaerobic reaction tank. The water outlet is located near the top of the anaerobic reaction tank. The screen and the water-passing baffle are both located inside the anaerobic reaction tank. The screen is located below the water-passing baffle, and the two together form an anaerobic reaction space between the inlet and the outlet. The stirrer is connected to the bucket lid, passes through the water-passing baffle, and extends into the anaerobic reaction space.

[0008] In this technical solution, a stirrer is used to mix the microbial film and petroleum hydrocarbons in the anaerobic reaction space, so as to avoid the formation of "dead zones" at the bottom or in the corners, thereby improving the treatment efficiency and avoiding sludge deposition.

[0009] In addition, by setting up a water-passing baffle, even if the packing expands, it can be blocked in the anaerobic reaction space, thus avoiding the blockage of the outlet due to the expansion of the packing.

[0010] Furthermore, the water-passing baffle is detachably connected to the anaerobic reaction tank body, and the water-passing baffle can be removed when it is necessary to clean the inside of the anaerobic reaction tank.

[0011] Furthermore, the inner side wall of the anaerobic reaction tank is provided with a support part for supporting the water-passing baffle and a limiting part for restricting the longitudinal displacement of the water-passing baffle; The limiting part is located above the supporting part and is evenly distributed along the inner side wall of the anaerobic reaction tank. An installation space for the water-passing baffle is formed between the limiting part and the supporting part. The water-passing baffle is provided with grooves that are evenly distributed along its edge and adapted to the limiting part. The water-passing baffle aligns with the corresponding limiting part through its groove and enters the installation space. The water-passing baffle in the installation space is longitudinally limited by rotating its angle.

[0012] In this technical solution, when it is necessary to remove the water-passing baffle from the anaerobic reaction tank, it is only necessary to rotate the water-passing baffle so that the groove of the water-passing baffle is aligned with the corresponding limiting part, and then the water-passing baffle can be removed from the anaerobic reaction tank by providing an upward lifting force.

[0013] Furthermore, the water-passing baffle is provided with through holes to facilitate the passage of the agitator; A first bearing is installed at the through hole; The rotating shaft of the stirrer is connected to the inner ring of the first bearing.

[0014] In this technical solution, the water-passing baffle not only prevents the outlet from being blocked due to the expansion of the packing, but also works with the first bearing to improve the stability of the agitator during rotation.

[0015] Furthermore, the anaerobic reaction tank is also equipped with a drain outlet; The sewage outlet is located at the bottom of the anaerobic reaction tank. The screen includes a screen frame, a fixed part, and a rotating part; The sieve frame is fixed to the inner side wall of the anaerobic reaction tank, and the inner side wall of the sieve frame is provided with a support groove. The fixing part is fixedly connected to the inner side wall of the sieve frame; The rotating part is inserted into the support groove and rotatably connected to the fixed part. The opening and closing states of the screen can be switched by adjusting the rotation angle of the rotating part.

[0016] In this technical solution, during the anaerobic reaction in the anaerobic reactor, the screen is switched to a closed state by adjusting the rotation angle of the rotating part. When it is necessary to clean the space below the screen inside the anaerobic reactor, the screen is switched to an open state by adjusting the rotation angle of the rotating part. The wastewater generated after cleaning is discharged through the drain outlet.

[0017] Furthermore, the screen also includes a locking member for locking the rotating part, which is detachably connected to the fixed part and the rotating part.

[0018] In this technical solution, when the screen is switched to the closed state, the locking member connects with the fixed part and the rotating part, locking the relative positions of the fixed part and the rotating part to prevent the rotating part from rotating. When the screen is switched to the open state, the locking member separates from the fixed part and the rotating part, allowing the rotating part to rotate.

[0019] Furthermore, the fixing part includes a first sector-shaped part, a second sector-shaped part, and a first connecting part connecting the first sector-shaped part and the second sector-shaped part; The rotating part includes a third sector-shaped part, a fourth sector-shaped part, and a second connecting part connecting the third sector-shaped part and the fourth sector-shaped part; The locking component includes a locking part, a third connecting part, and a locking pin; The third connecting part connects between the two locking parts; The locking part is engaged between the first sector part and the second sector part; One end of the locking pin is connected to the corresponding locking part, and the other end is inserted into the screen hole of the corresponding third sector or fourth sector.

[0020] Furthermore, the locking component is provided with a second bearing; The outer ring of the second bearing is connected to the locking element; The rotating shaft of the stirrer is connected to the inner ring of the second bearing.

[0021] In this technical solution, the locking component is not only used to lock the rotating part, but also cooperates with the second bearing to further improve the stability of the stirrer during rotation.

[0022] Furthermore, the agitator also includes an agitator blade connected to the rotating shaft, a motor, and a mounting base; The barrel lid has an opening in the middle, and a third bearing is installed at the opening; The rotating shaft passes through the opening and is connected to the inner ring of the third bearing; The stirring paddle is placed inside the anaerobic reaction space; The motor is mounted on the bucket lid via a mounting bracket, and its output end is connected to the rotating shaft via a gear assembly, driving the stirring paddle to rotate.

[0023] Furthermore, the bucket lid includes a first sub-lid and a second sub-lid; The motor is mounted on the first sub-cover via a mounting bracket; The second sub-cover is hinged to the first sub-cover, and by cooperating with the first sub-cover, it can close or open the upper opening of the anaerobic reaction tank.

[0024] In this technical solution, when it is necessary to add the activated anaerobic petroleum hydrocarbon degradation bacteria liquid into the anaerobic reaction tank, it is only necessary to open the second sub-cap, without moving the stirrer, making the operation simple.

[0025] Furthermore, this utility model also provides an anaerobic reaction system, including a waste liquid storage tank for storing cutting fluid waste liquid, a clean water storage tank for storing clean water, a peristaltic pump, and the aforementioned anaerobic reactor. The waste liquid storage tank and the clean water storage tank are connected to the inlet of the anaerobic reactor via pipes; The pipeline includes branch pipes that are respectively connected to the waste liquid storage tank and the clean water storage tank, and a manifold connecting the branch pipes and the water inlet; The peristaltic pumps are respectively installed on the branch pipe connected to the waste liquid storage tank and the branch pipe connected to the clean water storage tank.

[0026] Compared with existing technologies, the principles and advantages of this technical solution are as follows: 1. By installing a stirrer, the microbial film and petroleum hydrocarbons can be fully mixed in the anaerobic reaction space, avoiding the formation of "dead zones" at the bottom or in corners. This improves treatment efficiency while preventing sludge deposition. Additionally, by installing a baffle plate, even if the packing material expands, it can be contained within the anaerobic reaction space, preventing blockage of the outlet due to packing expansion.

[0027] 2. The water-passing baffle is detachably connected to the anaerobic reactor body. When cleaning the anaerobic reactor body is required, the water-passing baffle can be removed. Additionally, the water-passing baffle has a through hole for the agitator to pass through. A first bearing is installed at the through hole, and the agitator's rotating shaft is connected to the inner ring of the first bearing. This allows the water-passing baffle to not only prevent blockage of the outlet due to packing expansion but also, in conjunction with the first bearing, improve the stability of the agitator during rotation.

[0028] 3. The screen, by switching between open and closed states, can both cooperate with the anaerobic reactor for anaerobic reactions (primarily serving to support the packing material and facilitate water passage) and facilitate cleaning of the space below the screen inside the anaerobic reactor. Additionally, the screen includes a locking mechanism, which not only locks the rotating parts but also works with the second bearing to further improve the stability of the agitator during rotation. (The locking mechanism can be removed simultaneously with disassembling the agitator). Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the services required in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is one of the structural schematic diagrams of an anaerobic reactor according to an embodiment of the present invention; Figure 2 This is a second schematic diagram of the structure of an anaerobic reactor according to an embodiment of the present invention (part of the anaerobic reaction tank wall is omitted and the groove of the water-passing baffle is offset from the limiting part). Figure 3 This is a third schematic diagram of the structure of an anaerobic reactor according to an embodiment of the present invention (part of the anaerobic reaction tank wall is omitted and the groove of the water-passing baffle is aligned with the corresponding limiting part). Figure 4 This is a schematic diagram of the structure of a water-passing baffle in an anaerobic reactor according to an embodiment of the present invention (with a first bearing). Figure 5 This is one of the schematic diagrams showing the relative positions of the locking and fixing parts and the rotating parts of the locking component in an anaerobic reactor according to an embodiment of this utility model (the screen is switched to the closed state). Figure 6 This is a second schematic diagram showing the relative positions of the locking and fixing parts and the rotating parts of the locking component in an anaerobic reactor according to an embodiment of this utility model (the screen is switched to the closed state). Figure 7 This is a schematic diagram of an anaerobic reactor with the screen switched to the open state according to an embodiment of the present invention; Figure 8 This is a schematic diagram of an anaerobic reaction system according to an embodiment of the present invention.

[0031] Figure label: 1-Anaerobic reaction tank body; 2-Tank lid; 3-Agitator; 4-Screen; 5-Water baffle; 6-Inlet; 7-Outlet; 8-Drainage outlet; 9-Support part; 10-Limiting part; 11-Groove; 12-First bearing; 13-Screen frame; 14-Fixing part; 15-Rotating part; 16-Support groove; 17-Locking part; 18-First sector part; 19-Second sector part; 20-First connecting part; 21-Third sector part; 22-Fourth sector part; 23-Second connecting part; 24-Positioning part; 25-Third connecting part; 26-Locking column; 27-Second bearing; 28-Agitator; 29-Motor; 30-Mounting base; 31-First sub-cover; 32-Second sub-cover; 33-Waste liquid storage tank; 34-Clean water storage tank; 35-Peristaltic pump. Detailed Implementation

[0032] The present invention will be further described below with reference to specific embodiments: like Figures 1 to 7 As shown, the anaerobic reactor described in this embodiment includes an anaerobic reaction tank 1, a tank cover 2 located at the upper end of the anaerobic reaction tank 1, a stirrer 3 with a rotating shaft, a screen 4, and a water-passing baffle 5. The anaerobic reactor 1 is equipped with an inlet 6 with a valve, an outlet 7, and a drain 8. The inlet 6 is located near the bottom of the anaerobic reactor 1; the outlet 7 is located near the top of the anaerobic reactor 1; the drain 8 is located at the bottom of the anaerobic reactor 1; the screen 4 and the water-passing baffle 5 are both located inside the anaerobic reactor 1, with the screen 4 located below the water-passing baffle 5. Together, they form an anaerobic reaction space between the inlet 6 and the outlet 7; the stirrer 3 is connected to the lid 2, passes through the water-passing baffle 5, and extends into the anaerobic reaction space.

[0033] Specifically, in this embodiment, the water-passing baffle 5 is detachably connected to the anaerobic reaction tank 1, and the detachable connection structure is as follows: The inner wall of the anaerobic reactor tank 1 is provided with a support part 9 for supporting the water-passing baffle 5 and a limiting part 10 for limiting the longitudinal displacement of the water-passing baffle 5. The limiting part 10 is located above the support part 9 and is evenly distributed along the inner wall of the anaerobic reactor tank 1. An installation space for the water-passing baffle 5 is formed between the limiting part 10 and the support part 9. The water-passing baffle 5 is provided with grooves 11 evenly distributed along its edge and adapted to the limiting part 10. The water-passing baffle 5 enters the installation space by aligning its grooves 11 with the corresponding limiting part 10. The water-passing baffle 5 enters the installation space by rotating its angle to achieve longitudinal limitation.

[0034] Specifically, in this embodiment, the water-passing baffle 5 is provided with a through hole for the stirrer 3 to pass through, and a first bearing 12 is installed at the through hole; the rotating shaft of the stirrer 3 is connected to the inner ring of the first bearing 12.

[0035] Specifically, in this embodiment, the screen 4 includes a screen frame 13, a fixing part 14, a rotating part 15, and a locking member 17 for locking the rotating part 15; the screen frame 13 is fixed to the inner wall of the anaerobic reaction tank 1, and the inner wall of the screen frame 13 is provided with a support groove 16; the fixing part 14 is fixedly connected to the inner wall of the screen frame 13; the rotating part 15 is inserted into the support groove 16 and rotatably connected to the fixing part 14, and the screen 4 can be switched between open and closed states by adjusting the rotation angle of the rotating part 15.

[0036] Specifically, in this embodiment, the fixing part 14 includes a first sector-shaped part 18, a second sector-shaped part 19, and a first connecting part 20 connected between the first sector-shaped part 18 and the second sector-shaped part 19; the rotating part 15 includes a third sector-shaped part 21, a fourth sector-shaped part 22, and a second connecting part 23 connected between the third sector-shaped part 21 and the fourth sector-shaped part 22; the locking member 17 includes a locking part 24, a third connecting part 25, and a locking post 26; the third connecting part 25 is connected between the two locking parts 24; the locking part 24 is locked between the first sector-shaped part 18 and the second sector-shaped part 19; one end of the locking post 26 is connected to the corresponding locking part 24, and (when the screen 4 is switched to the closed state) the other end is inserted into the screen 4 hole of the corresponding third sector-shaped part 21 or the fourth sector-shaped part 22.

[0037] Specifically, in this embodiment, the locking member 17 is provided with a second bearing 27; the outer ring of the second bearing 27 is connected to the locking member 17; and the rotating shaft of the stirrer 3 is connected to the inner ring of the second bearing 27.

[0038] Specifically, in this embodiment, the stirrer 3 further includes a stirring paddle 28 connected to the rotating shaft, a motor 29, and a mounting base 30; the barrel cover 2 has an opening in the middle, and a third bearing is provided at the opening; the rotating shaft passes through the opening and is connected to the inner ring of the third bearing; the stirring paddle 28 is placed in the anaerobic reaction space; the motor 29 is mounted on the barrel cover 2 through the mounting base 30, and its output end is connected to the rotating shaft through a gear assembly to drive the stirring paddle 28 to rotate.

[0039] Specifically, in this embodiment, the barrel cover 2 includes a first sub-cover 31 and a second sub-cover 32; the motor 29 is mounted on the first sub-cover 31 via a mounting base 30; the second sub-cover 32 is hinged to the first sub-cover 31, and by cooperating with the first sub-cover 31, it closes or opens the upper barrel opening of the anaerobic reaction barrel 1.

[0040] like Figure 8As shown, this embodiment also includes an anaerobic reaction system, which includes a waste liquid storage tank 33 storing cutting fluid waste liquid, a clean water storage tank 34 storing clean water, two peristaltic pumps 35, and the aforementioned anaerobic reactor. Waste liquid storage tank 33 and clean water storage tank 34 are connected to the inlet 6 of the anaerobic reactor via pipes; the pipes include branch pipes connected to the waste liquid storage tank 33 and the clean water storage tank 34 respectively, and a manifold connecting the branch pipes and the inlet 6; two peristaltic pumps 35 are respectively installed on the branch pipe connected to the waste liquid storage tank 33 and the branch pipe connected to the clean water storage tank 34.

[0041] In this embodiment, the working principle of the anaerobic reaction system is as follows: 1) After adjusting the screen 4 to the closed state, add sponge packing into the anaerobic reaction tank 1, and then install the tank cover 2, stirrer 3, and water-passing baffle 5 on the anaerobic reaction tank 1. 2) Two peristaltic pumps 35 work together to transport the cutting fluid waste in the waste liquid storage tank 33 and the clean water in the clean water tank through their respective branch pipes, the confluence pipe and the inlet 6 of the anaerobic reaction tank 1 into the anaerobic reaction tank 1, so that the initial COD concentration of the cutting fluid waste is stabilized at about 10000 mg / L and the two peristaltic pumps 35 stop working when the liquid level of the cutting fluid waste is about to reach the lower end of the outlet 7. 3) Open the second sub-cover 32, add approximately 1% of the activated bacterial solution to the anaerobic reaction tank 1, then close the two peristaltic pumps 35, the valve of the inlet 6, the valve of the outlet 7, and the second sub-cover 32. Turn on the stirrer 3 (motor 29 drives the stirring paddle 28 to rotate via a gear assembly), and incubate for 10-15 days. After microscopic examination shows successful microbial biofilm formation in the anaerobic reaction space, proceed to the next step. 4) After successful microbial biofilm formation, open the valves of two peristaltic pumps 35, inlet 6, and outlet 7 to intermittently introduce waste cutting fluid and clean water. After 2 hours of water introduction (waste cutting fluid and clean water), close the valves of inlet 6 and outlet 7, and turn on the agitator 3 to run in a closed system for 6 hours. After the operation is completed, open the valves of inlet 6 and outlet 7 again and repeat the previous water introduction and closed operation until the COD concentration at outlet 7 does not change significantly.

[0042] During the above work process, The motor 29 drives the agitator 28 to rotate through the gear assembly, so that the microbial film and petroleum hydrocarbons can be fully mixed in the anaerobic reaction space during the anaerobic reaction process, avoiding the formation of "dead zones" at the bottom or in the corners, thereby improving the treatment efficiency while avoiding sludge deposition.

[0043] By setting up the water-passing baffle 5, even if the packing expands, it can be contained within the anaerobic reaction space, preventing blockage of the outlet 7 due to packing expansion. The water-passing baffle 5 can also cooperate with the first bearing 12 to improve the stability of the agitator 3 during rotation.

[0044] With the screen 4 in the closed state, the locking member 17 locks the relative positions of the fixed part 14 and the rotating part 15, preventing the rotating part 15 from rotating. In addition, the locking member 17 can also cooperate with the second bearing 27 to further improve the stability of the stirrer 3 when it rotates.

[0045] When the anaerobic reaction system is not in operation and the interior of the anaerobic reaction tank 1 needs to be cleaned, open the second sub-cover 32 and rotate the water-passing baffle 5 so that the groove 11 of the water-passing baffle 5 aligns with the corresponding limiting part 10. The water-passing baffle 5 can then be removed from the anaerobic reaction tank 1 together with the tank cover 2, the agitator 3, and the locking part 17. Next, remove the sponge packing material and drain the liquid from the anaerobic reaction tank 1. Then, adjust the rotation angle of the rotating part 15 to switch the screen 4 to the open state, so that the interior of the anaerobic reaction tank 1 (including the anaerobic reaction space and the space below the screen 4) can be cleaned. The wastewater generated after cleaning is discharged through the drain port 8.

[0046] The above-described embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all changes made in accordance with the shape and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. An anaerobic reactor, characterized in that, It includes an anaerobic reactor body, a lid located at the top of the anaerobic reactor body, a stirrer with a rotating shaft, a screen, and a water-passing baffle. The anaerobic reaction tank is equipped with an inlet and an outlet with valves; The water inlet is located near the bottom of the anaerobic reaction tank. The water outlet is located near the top of the anaerobic reaction tank. The screen and the water-passing baffle are both located inside the anaerobic reaction tank. The screen is located below the water-passing baffle, and the two together form an anaerobic reaction space between the inlet and the outlet. The stirrer is connected to the bucket lid, passes through the water-passing baffle, and extends into the anaerobic reaction space.

2. The anaerobic reactor according to claim 1, characterized in that, The water-passing baffle is detachably connected to the anaerobic reaction tank.

3. An anaerobic reactor according to claim 2, characterized in that, The inner side wall of the anaerobic reaction tank is provided with a support part for supporting the water-passing baffle and a limiting part for restricting the longitudinal displacement of the water-passing baffle. The limiting part is located above the supporting part and is evenly distributed along the inner side wall of the anaerobic reaction tank. An installation space for the water-passing baffle is formed between the limiting part and the supporting part. The water-passing baffle is provided with grooves that are evenly distributed along its edge and adapted to the limiting part. The water-passing baffle aligns with the corresponding limiting part through its groove and enters the installation space. The water-passing baffle in the installation space is longitudinally limited by rotating its angle.

4. An anaerobic reactor according to claim 1, characterized in that, The water-passing baffle is provided with through holes to facilitate the passage of the agitator; A first bearing is installed at the through hole; The rotating shaft of the stirrer is connected to the inner ring of the first bearing.

5. An anaerobic reactor according to claim 1, characterized in that, The anaerobic reaction tank is also equipped with a drain outlet; The sewage outlet is located at the bottom of the anaerobic reaction tank. The screen includes a screen frame, a fixed part, and a rotating part; The sieve frame is fixed to the inner side wall of the anaerobic reaction tank, and the inner side wall of the sieve frame is provided with a support groove. The fixing part is fixedly connected to the inner side wall of the sieve frame; The rotating part is inserted into the support groove and rotatably connected to the fixed part. The opening and closing states of the screen can be switched by adjusting the rotation angle of the rotating part.

6. An anaerobic reactor according to claim 5, characterized in that, The screen also includes a locking element for locking the rotating part; The fixing part includes a first sector-shaped part, a second sector-shaped part, and a first connecting part connecting the first sector-shaped part and the second sector-shaped part; The rotating part includes a third sector-shaped part, a fourth sector-shaped part, and a second connecting part connecting the third sector-shaped part and the fourth sector-shaped part; The locking component includes a locking part, a third connecting part, and a locking pin; The third connecting part connects between the two locking parts; The locking part is engaged between the first sector part and the second sector part; One end of the locking pin is connected to the corresponding locking part, and the other end is inserted into the screen hole of the corresponding third sector or fourth sector.

7. An anaerobic reactor according to claim 6, characterized in that, The locking component is provided with a second bearing; The outer ring of the second bearing is connected to the locking element; The rotating shaft of the stirrer is connected to the inner ring of the second bearing.

8. An anaerobic reactor according to claim 1, characterized in that, The agitator also includes an agitator blade connected to the rotating shaft, a motor, and a mounting base; The barrel lid has an opening in the middle, and a third bearing is installed at the opening; The rotating shaft passes through the opening and is connected to the inner ring of the third bearing; The stirring paddle is placed inside the anaerobic reaction space; The motor is mounted on the bucket lid via a mounting bracket, and its output end is connected to the rotating shaft via a gear assembly, driving the stirring paddle to rotate.

9. An anaerobic reactor according to claim 8, characterized in that, The bucket lid includes a first sub-lid and a second sub-lid; The motor is mounted on the first sub-cover via a mounting bracket; The second sub-cover is hinged to the first sub-cover, and by cooperating with the first sub-cover, it can close or open the upper opening of the anaerobic reaction tank.

10. An anaerobic reaction system, characterized in that, It includes a waste liquid storage tank for storing waste cutting fluid, a clean water storage tank for storing clean water, a peristaltic pump, and an anaerobic reactor as described in any one of claims 1-9; The waste liquid storage tank and the clean water storage tank are connected to the inlet of the anaerobic reactor via pipes; The pipeline includes branch pipes that are respectively connected to the waste liquid storage tank and the clean water storage tank, and a manifold connecting the branch pipes and the water inlet; The peristaltic pumps are respectively installed on the branch pipe connected to the waste liquid storage tank and the branch pipe connected to the clean water storage tank.

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