An anaerobic three-phase separation system and its usage method

Abstract

The present application discloses an anaerobic three-phase separation system and a method for using the same. The anaerobic three-phase separation system includes a reaction tank and a gas collection tank. The gas collection tank is located on the outer side of the reaction tank, and the side wall of the reaction tank separates the gas collection tank from the reaction tank. A reflector array is provided inside the reaction tank. The reflector array includes a plurality of reflectors. The reflectors are long and narrow folded plate structures. The reflectors have two side wings, and an angle facing downward is formed between the two side wings. An air vent for inserting the end of the reflector is provided on the side wall of the reaction tank, and the air vent communicates the gas collection tank with the reaction tank. A side opening is provided on the side of the gas collection tank away from the reaction tank, and a sealing plate for closing the side opening is provided on the gas collection tank. A gas-liquid separation chamber is provided at the top of the reaction tank, and a lifting gas pipe is connected between the bottom wall of the gas-liquid separation chamber and the top wall of the gas collection tank. In the present application, the sealing plate of the gas collection tank can be removed to expose the side opening and the air vent, so that the staff can flush the reflectors through the air vent.

Description

Technical Field

[0001] This application relates to the field of sewage treatment technology, and in particular to an anaerobic three-phase separation system and a method for using the same. Background Art

[0002] The internal circulation anaerobic reactor consists of two reaction chambers, an upper one and a lower one. Wastewater flows upward in the reactor, and pollutants are adsorbed and degraded by bacteria. The purified water flows out from the upper part of the reactor.

[0003] A three-phase separation structure is provided inside the internal circulation anaerobic reactor, and the three-phase separation structure can separate biogas, water, and sludge precipitates. The main component of the three-phase separation is a reflector plate distributed in an array. After long-term use, sludge will adhere to the reflector plate. The adhesion of sludge to the reflector plate will affect the efficiency of the reflector plate in separating biogas and is likely to block the biogas delivery pipe connecting the reflector plates. Also, because the reflector plates are installed in a closed space, it is difficult to clean the reflector plates. Summary of the Invention

[0004] In order to solve the problem that the reflector plates of the internal circulation anaerobic reactor are difficult to clean, this application provides an anaerobic three-phase separation system and a method for using the same.

[0005] The anaerobic three-phase separation system and the method for using the same provided by this application adopt the following technical solutions:

[0006] An anaerobic three-phase separation system includes a reaction tank and a gas collection tank. The gas collection tank is located on the outer side of the reaction tank, and the side wall of the reaction tank separates the gas collection tank from the reaction tank. An array of reflector plates is provided inside the reaction tank. The array of reflector plates includes a plurality of reflector plates. The reflector plates are long and narrow folded plate structures. The reflector plates have two wings, and an angle facing downward is formed between the two wings. An air vent for inserting the end of the reflector plate is provided on the side wall of the reaction tank, and the air vent communicates the gas collection tank with the reaction tank. A side opening is provided on the side of the gas collection tank away from the reaction tank, and a sealing plate is provided on the gas collection tank for closing the side opening. A gas-liquid separation chamber is provided at the top of the reaction tank, and a lifting gas pipe is connected between the bottom wall of the gas-liquid separation chamber and the top wall of the gas collection tank.

[0007] By adopting the above technical solution, when the anaerobic three-phase separation system is used for sewage treatment, the sewage in the reaction tank flows from bottom to top. The organic matter in the sewage forms biogas through anaerobic fermentation. When the biogas floats to the reflector array, under the guiding action of the reflector, it enters the gas collection tank through the ventilation port, and then flows through the lifting gas pipe to the gas-liquid separation chamber for gas-liquid separation. After the anaerobic three-phase separation system has been used for a long time, a large amount of sludge will adhere to the surface of the reflector. In this case, the reaction tank can be emptied, and then the sealing plate can be removed to expose the side opening and the ventilation port, so that the staff can flush the reflector through the ventilation port to make the surface of the reflector smooth again, which is beneficial to ensuring the separation effect of the three-phase separation system. On the other hand, by collecting the biogas collected under each reflector into the gas collection tank first and then discharging it from the gas collection tank into the gas-water separation chamber, it helps to reduce the blockage of the biogas transmission pipeline.

[0008] Optionally, the reflector is detachably connected to the reaction tank, and a supporting structure for supporting the reflector is provided on one side of the reaction tank away from the gas collection tank.

[0009] By adopting the above technical solution, the reflector is detachably connected to the reaction tank, so that the reflector can be taken out of the reaction tank for more comprehensive cleaning. When the reflector is installed in the reaction tank, one end of the reflector is positioned by the ventilation port, and the other end is supported by the supporting structure, so that the installation state of the reflector remains stable.

[0010] Optionally, a wedge-shaped piece is provided at one end of the reflector close to the gas collection tank. The wedge-shaped piece abuts against the edge of the ventilation port, and the thick end of the wedge-shaped piece is located in the gas collection tank.

[0011] By adopting the above technical solution, when the reflector is installed in the reaction tank, the wedge-shaped piece can tightly abut against the edge of the ventilation port, making the installation state of the reflector more stable.

[0012] Optionally, both the side opening and the sealing plate are rectangular. The sealing plate is located inside the gas collection tank, and the sealing plate is connected to the gas collection tank through threaded fasteners; the width of the sealing plate is greater than the width of the side opening and less than the length of the side opening, and the length of the sealing plate is greater than the length of the side opening; when the sealing plate is in the gas collection tank, the sealing plate can rotate around its geometric center within its geometric plane.

[0013] By adopting the above technical solution, when installing the sealing plate, first rotate the sealing plate to a state where the width direction is parallel to the length direction of the side opening, so that the sealing plate can tilt into the gas collecting box through the side opening. After the sealing plate enters the inner side of the gas collecting box, rotate the sealing plate 90° around its own geometric center in a plane, so that the length direction of the sealing plate is parallel to the length direction of the side opening, and the width direction of the sealing plate is parallel to the width direction of the side opening, so that the sealing plate can cover the side opening from the inside to the outside, and then use threaded fasteners to install and fix the sealing plate. Since the sealing plate is installed on the inner side of the gas collecting box, when the water pressure inside the gas collecting box acts on the sealing plate, the sealing effect between the sealing plate and the edge of the side opening can be enhanced, thereby reducing leakage at the connection between the sealing plate and the edge of the side opening.

[0014] Optionally, the threaded fastener is a bolt, which is connected to the side wall of the gas collecting box and the sealing plate. A square pressure plate is fixedly provided on one side of the sealing plate close to the reaction tank. The thickness of the pressure plate is greater than that of the sealing plate. The pressure plate is provided with a threaded hole adapted to the bolt.

[0015] By adopting the above technical solution, when installing and fixing the sealing plate, the bolts pass through the side wall of the gas collecting box and the sealing plate in turn and then lock with the threaded holes on the pressing plate to fix the sealing plate. The thickness of the pressing plate is large, so that the effective thread engagement size between the threaded hole and the bolt is large. At the same time, the pressing plate is set as a square frame structure, so that the pressing plate can provide a large threaded hole depth while minimizing the overall weight of the sealing plate and the pressing plate.

[0016] Optionally, one end of the reflective plate close to the gas collecting box extends into the inner side of the gas collecting box.

[0017] By adopting the above technical solution, since one end of the reflective plate extends into the inner side of the gas collecting box, when the biogas flowing along the surface of the reflective plate leaves the reflective plate, the biogas has already entered the inner side of the gas collecting box, which is conducive to allowing as much biogas as possible to enter the inner side of the gas collecting box.

[0018] Optionally, the reflective plate is provided with a bottom plate and an end plate at one end close to the air collecting box, the bottom plate passes through the vent, the two sides of the bottom plate are respectively closed and connected to the two side wings of the reflective plate, the end plate is connected to the bottom plate and the reflective plate at the same time, the reflective plate, the bottom plate and the end plate together form a cylindrical space with one end closed; the reflective plate is provided with an exhaust hole, which can be connected to the inner space of the air collecting box, and the upper surface of the reflective plate is provided with a movable cover for shielding the exhaust hole.

[0019] By adopting the above technical solution, the reflector plate, the bottom plate and the end plate can jointly function to separate the reaction tank from the gas collection tank. As biogas accumulates in the lower surface area of the reflector plate, when the lifting force of the biogas is greater than the gravity of the movable cover, the biogas can push open the movable cover and enter the inner side of the gas collection tank. When the lifting force of the biogas decreases, the movable cover falls back to cover the exhaust hole again to reduce the entry of sewage and sludge in the reaction tank into the gas collection tank.

[0020] Optionally, the reflector plate is provided with an exhaust pipe which is arranged vertically. The movable cover includes a top cover plate and a peripheral wall. The peripheral wall of the movable cover is sleeved on the exhaust pipe, and the exhaust hole is opened on the peripheral wall. The edge of the exhaust hole is tangent to the top cover plate.

[0021] By adopting the above technical solution, the exhaust pipe communicates the spaces on the upper and lower surfaces of the reflector plate. The biogas collected below the reflector plate is discharged into the gas collection tank through the exhaust pipe. When the biogas enters the gas collection tank from the exhaust pipe, only a relatively small height needs to be lifted upward for the movable cover to make the exhaust hole communicate with the inner cavity of the exhaust pipe. During the up and down movement of the movable cover, the exhaust pipe plays a guiding role for the movable cover.

[0022] Optionally, the gas collection tank is provided with a water supply pipe.

[0023] By adopting the above technical solution, after the sewage in the reaction tank is drained, the gas collection tank can be flushed by using the water supply pipe, which can keep the inside of the gas collection tank clean and is beneficial to improving the working environment.

[0024] A method for using an anaerobic three-phase separation system includes the following steps: during the process of injecting sewage into the reaction tank through the water inlet pipe, at the same time, clean water is injected into the gas collection tank by using the water supply pipe to make the clean water occupy the space in the gas collection tank.

[0025] By adopting the above technical solution, using the clean water to occupy the space in the gas collection tank can reduce the entry of solid substances in the sewage into the gas collection tank and is beneficial to keeping the inside of the gas collection tank clean.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] After the anaerobic three-phase separation system has been used for a long time, more sludge will adhere to the surface of the reflector plate. In this case, the reaction tank can be emptied, and then the sealing plate can be removed to expose the side opening and the ventilation port, so that the staff can flush the reflector plate through the ventilation port to make the surface of the reflector plate smooth again, which is beneficial to ensuring the separation effect of the three-phase separation system.

[0028] Since the sealing plate is installed inside the gas collection tank, when the water pressure inside the gas collection tank acts on the sealing plate, the sealing effect between the sealing plate and the edge of the side opening can be enhanced, thereby reducing the leakage at the connection between the sealing plate and the edge of the side opening. Brief Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the anaerobic three-phase separation system of Embodiment 1.

[0030] Figure 2 It is a schematic diagram of the semi-section state of the anaerobic three-phase separation system in Embodiment 1.

[0031] Figure 3 It is a schematic structural diagram of the baffle plate of Embodiment 1.

[0032] Figure 4 It is a schematic diagram of Embodiment 1 for showing the positional relationship between the side opening and the sealing plate.

[0033] Figure 5 It is a schematic diagram of Embodiment 1 for showing the connection relationship between the gas collection tank and the sealing plate.

[0034] Figure 6 It is a schematic structural diagram of the baffle plate of Embodiment 2.

[0035] Description of Reference Numerals:

[0036] 1. Reaction tank; 11. Water inlet pipe; 12. Sludge discharge pipe; 13. Water outlet pipe; 14. Ventilation port; 2. Gas-liquid separation tank; 20. Gas-liquid separation chamber; 21. Drainage pipeline; 22. Exhaust pipeline; 3. Gas collection tank; 31. Lift gas pipe; 32. Side opening; 33. Sealing plate; 331. Sealing gasket; 34. Threaded fastener; 35. Pressing plate; 36. Threaded hole; 4. Rotating water distributor; 5. Baffle plate array; 51. Baffle plate; 511. Flank; 512. Supporting structure; 513. Wedge-shaped piece; 514. Bottom plate; 515. End plate; 516. Exhaust pipe; 5161. Conical surface; 517. Movable cover; 5171. Top cover plate; 5172. Peripheral wall; 5173. Exhaust hole; 518. Limiting member; 6. Water supply pipe. Detailed Description of the Invention

[0037] The following further elaborates on this application Figure 1-6 in conjunction with the attached drawings. Embodiment 1

[0038] This application embodiment discloses an anaerobic three-phase separation system. Refer to Figure 1 and Figure 2, The anaerobic three-phase separation system includes a reaction tank 1, a gas-liquid separation tank 2 and two gas collection tanks 3. The bottom of the reaction tank 1 is provided with a water inlet pipe 11 and a sludge discharge pipe 12, and the top of the reaction tank 1 is provided with a water outlet pipe 13; the gas collection tank 3 is located on the outer side of the reaction tank 1, and the side wall of the reaction tank 1 separates the gas collection tank 3 from the reaction tank 1; a rotary water distributor 4 and two groups of baffle arrays 5 are arranged inside the reaction tank 1. The rotary water distributor 4 is located at the bottom of the reaction tank 1 and is used to evenly distribute the sewage entering the reaction tank 1.

[0039] The two groups of baffle arrays 5 are located above the rotary water distributor 4 and are arranged at intervals in the vertical direction. The baffle array 5 includes a plurality of baffles 51. The side wall of the reaction tank 1 is provided with ventilation openings 14 for inserting the ends of the baffles 51. The ventilation openings 14 correspond to the baffles 51 one by one. The ventilation openings 14 communicate the gas collection tank 3 with the reaction tank 1, and the baffles 51 are used to introduce the biogas generated in the sewage into the gas collection tank 3.

[0040] The gas-liquid separation tank 2 is located on the top of the reaction tank 1, and the inner space of the gas-liquid separation tank 2 serves as a gas-liquid separation chamber 20; in other embodiments, the gas-liquid separation chamber 20 can be formed by partitioning on the top of the reaction tank 1 using a partition plate. A lifting gas pipe 31 is respectively connected between the bottom wall of the gas-liquid separation chamber 20 and the top wall of each gas collection tank 3. The gas-liquid separation chamber 20 is provided with a drainage pipeline 21 and an exhaust pipeline 22. The drainage pipeline 21 discharges or returns the water in the gas-liquid separation chamber 20 to the reaction tank 1, and the exhaust pipeline 22 centrally discharges the biogas in the gas-liquid separation chamber 20 to a specific space.

[0041] When the anaerobic three-phase separation system works, sewage enters the inner side of the reaction tank 1 from the water inlet pipe 11 to produce biogas. During the process of the biogas and sewage rising and moving, they successively pass through the two groups of baffle arrays 5. The baffle arrays 5 introduce the biogas into the gas collection tank 3, and then enter the gas-liquid separation chamber 20 through the lifting gas pipe 31 for gas-liquid separation; during the process of the sewage in the reaction tank 1 flowing towards the water outlet pipe 13, the solid substances are blocked by the baffle arrays 5 and settle to the bottom of the reaction tank 1, realizing the solid-liquid separation of the sewage.

[0042] Refer to Figure 2 and Figure 3 , The baffle 51 is a long and narrow folded plate structure. The baffle 51 has two side wings 511, and an angle facing downwards is formed between the two side wings 511. One end of the baffle 51 is inserted into the corresponding ventilation opening 14 and extends into the inner side of the gas collection tank 3. On the side of the reaction tank 1 away from the gas collection tank 3, there is a supporting structure 512 for supporting the baffle 51. The supporting structure is a plate fixed on the inner wall of the reaction tank 1.

[0043] In order to keep the installation state of the reflector 51 stable, a wedge-shaped piece 513 is fixedly provided on the outer surface of the reflector 51 at one end close to the air collecting box 3. The wedge-shaped piece 513 abuts against the edge of the air vent 14, and the thick end of the wedge-shaped piece 513 is located in the air collecting box 3. The wedge-shaped piece 513 can make the insertion state between the reflector 51 and the air vent 14 more stable.

[0044] Reference Figure 1 , Figure 4 and Figure 5 A side opening 32 is provided on the side of the gas collecting box 3 away from the reaction tank 1. The gas collecting box 3 is detachably provided with a sealing plate 33 for closing the side opening 32. A sealing gasket 331 is provided on the side of the sealing plate 33 away from the reaction tank 1. The side opening 32 and the sealing plate 33 are both rectangular. The sealing plate 33 is located on the inner side of the gas collecting box 3. The sealing plate 33 and the gas collecting box 3 are connected by threaded fasteners 34. The threaded fasteners 34 are bolts. The bolts are connected to the side wall of the gas collecting box 3 and the sealing plate 33. A square-shaped pressing plate 35 is fixedly provided on the side of the sealing plate 33 close to the reaction tank 1. The thickness of the pressing plate 35 is greater than the thickness of the sealing plate 33. The pressing plate 35 is provided with threaded holes 36 adapted to the bolts.

[0045] The width of the sealing plate 33 is greater than the width of the side opening 32 and smaller than the length of the side opening 32, and the length of the sealing plate 33 is greater than the length of the side opening 32; when the sealing plate 33 is in the air collecting box 3, the sealing plate 33 can rotate around its own geometric center in its own geometric plane.

[0046] When the sealing plate 33 is installed from the outside to the inside of the gas collecting box 3, the sealing plate 33 is first rotated to a state where the width direction is parallel to the length direction of the side opening 32, so that the sealing plate 33 can be tilted into the gas collecting box 3 through the side opening 32. After the sealing plate 33 enters the inside of the gas collecting box 3, the sealing plate 33 is rotated 90° around its own geometric center so that the sealing plate 33 can cover the side opening 32 from the inside to the outside, and then the sealing plate 33 is installed and fixed with bolts. Since the sealing plate 33 is installed on the inside of the gas collecting box 3, when the water pressure inside the gas collecting box 3 acts on the sealing plate 33, the sealing effect between the sealing plate 33 and the edge of the side opening 32 can be enhanced, thereby reducing the leakage at the connection between the sealing plate 33 and the edge of the side opening 32.

[0047] After the anaerobic three-phase separation system according to the embodiment of the present application has been used for a long time, a large amount of sludge will adhere to the surface of the baffle plate 51. In this case, the reaction tank 1 can be emptied, and then the sealing plate 33 is removed to expose the side opening 32 and the ventilation port 14, so that the staff can flush the baffle plate 51 through the ventilation port 14 to make the surface of the baffle plate 51 smooth again, which is beneficial to ensuring the separation effect of the three-phase separation system. On the other hand, by collecting the biogas gathered under each baffle plate 51 into the gas collection tank 3 first and then discharging it from the gas collection tank 3 into the gas-water separation chamber, the resistance in the process of collecting and discharging biogas can be reduced.

[0048] Refer to Figure 1 , a water supply pipe 6 is provided on the side wall of the gas collection tank 3, and one end of the water supply pipe 6 far away from the gas collection tank 3 is connected to the municipal water supply pipe network 6. Before removing the sealing plate 33, flushing the internal space of the gas collection tank 3 by using the water supply pipe 6 can improve the working environment.

[0049] The present embodiment also discloses a method for using the above-mentioned anaerobic three-phase separation system, including the following steps: during the process of injecting sewage into the reaction tank 1 through the water inlet pipe 11, at the same time, injecting clear water into the gas collection tank 3 by using the water supply pipe 6 to make the clear water occupy the space in the gas collection tank 3 to reduce the sewage from entering the gas collection tank 3. Embodiment 2

[0050] Refer to Figure 6 , the difference between the present embodiment and Embodiment 1 is that in the present embodiment, a bottom plate 514 and an end plate 515 are provided at one end of the baffle plate 51 close to the gas collection tank 3. The bottom plate 514 passes through the ventilation port 14, and both sides of the bottom plate 514 are hermetically connected to the two wings 511 of the baffle plate 51 respectively. The end plate 515 is connected to both the bottom plate 514 and the baffle plate 51 at the same time. The baffle plate 51, the bottom plate 514 and the end plate 515 enclose a closed cylindrical space at one end.

[0051] The baffle plate 51 is provided with an exhaust pipe 516, the exhaust pipe 516 is arranged vertically, and the upper end of the exhaust pipe 516 has a conical surface 5161; a movable cover 517 is provided at the upper end of the exhaust pipe 516. The movable cover 517 includes a top cover plate 5171 and a peripheral wall 5172. The peripheral wall 5172 of the movable cover 517 is sleeved on the exhaust pipe 516, and the peripheral wall 5172 of the movable cover 517 has a taper adapted to the conical surface 5161 of the exhaust pipe 516. An exhaust hole 5173 is opened on the peripheral wall 5172 of the movable cover 517. The exhaust hole 5173 is a long hole, and the length direction of the exhaust hole 5173 is the same as the length direction of the exhaust pipe 516. The edge of the exhaust hole 5173 is tangent to the top cover plate 5171. The exhaust hole 5173 can communicate with the inner space of the gas collection tank 3, and a movable cover 517 for shielding the exhaust hole 5173 is provided on the upper surface of the baffle plate 51.

[0052] The pipe wall of the exhaust pipe 516 is provided with a limiting member 518 for restricting the lifting and moving distance of the movable cover 517. In this embodiment, the limiting member 518 is a screw threadedly connected to the pipe wall of the exhaust pipe 516.

[0053] The reflector 51, the bottom plate 514 and the end plate 515 can jointly play the role of separating the reaction tank 1 and the gas collecting box 3. When the water supply pipe 6 is used to inject water to occupy the inner space of the gas collecting box 3, the situation of mutual circulation between the sewage in the reaction tank 1 and the clear water in the gas collecting box 3 can be reduced. As the biogas gathers in the lower surface area of the reflector 51, when the lifting force of the biogas is greater than the gravity of the movable cover 517, the biogas can push open the movable cover 517 and enter the inside of the gas collecting box 3. When the lifting force of the biogas drops, the movable cover 517 falls back again to cover the exhaust hole 5173, so as to reduce the sewage and sludge in the reaction tank 1 from entering the gas collecting box 3.

[0054] In addition, in the case where the gas collecting box 3 and the reaction tank 1 are separated from each other, a sewage discharge pipe with a switching valve can be provided on the bottom wall of the gas collecting box 3 as needed, and the sewage discharge pipe can be connected to the reaction tank 1 or discharged externally.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An anaerobic three-phase separation system, characterized in that: The invention comprises a reaction tank (1) and a gas collecting box (3), wherein the gas collecting box (3) is located on the outer side of the reaction tank (1), and the side wall of the reaction tank (1) separates the gas collecting box (3) and the reaction tank (1); a reflection plate array (5) is provided on the inner side of the reaction tank (1), wherein the reflection plate array (5) comprises a plurality of reflection plates (51), wherein the reflection plates (51) are narrow and long folded plate structures, wherein the reflection plates (51) have two side wings (511), wherein the two side wings (511) form a downward angle, and wherein the side wall of the reaction tank (1) is provided with a reflection plate array (5) for reflecting the reflection plates. A vent (14) is plugged into the end of the ejection plate (51), the vent (14) communicating with the gas collecting box (3) and the reaction tank (1); a side of the gas collecting box (3) away from the reaction tank (1) is provided with a side opening (32), the gas collecting box (3) is provided with a sealing plate (33) for sealing the side opening (32); a gas-liquid separation chamber (20) is provided on the top of the reaction tank (1), a lifting gas pipe (31) is connected between the bottom wall of the gas-liquid separation chamber (20) and the top wall of the gas collecting box (3); the gas collecting box (3) is provided with a water supply pipe (6); The reflecting plate (51) is provided with a bottom plate (514) and an end plate (515) at one end close to the air collecting box (3); the bottom plate (514) passes through the vent (14); the two sides of the bottom plate (514) are respectively and closedly connected to the two side wings (511) of the reflecting plate (51); the end plate (515) is connected to the bottom plate (514) and the reflecting plate (51) at the same time; the reflecting plate (51), the bottom plate (514) and the end plate (515) together form a cylindrical space with one end closed; the reflecting plate (51) is provided with an exhaust hole (5173) which can be connected to the inner space of the air collecting box (3); the upper surface of the reflecting plate (51) is provided with a movable cover (517) for shielding the exhaust hole (5173).

2. The anaerobic three-phase separation system according to claim 1, characterized in that: The reflecting plate (51) is detachably connected to the reaction tank (1); a supporting structure (512) for supporting the reflecting plate (51) is provided on a side of the reaction tank (1) away from the gas collecting box (3).

3. The anaerobic three-phase separation system according to claim 2, characterized in that: A wedge-shaped piece (513) is provided at one end of the reflection plate (51) close to the air collecting box (3); the wedge-shaped piece (513) abuts against the edge of the vent (14); and the thick end of the wedge-shaped piece (513) is located inside the air collecting box (3).

4. The anaerobic three-phase separation system according to claim 1, characterized in that: The side opening (32) and the sealing plate (33) are both rectangular; the sealing plate (33) is located on the inner side of the air collecting box (3); the sealing plate (33) and the air collecting box (3) are connected via a threaded fastener (34); the width of the sealing plate (33) is greater than the width of the side opening (32) and less than the length of the side opening (32); the length of the sealing plate (33) is greater than the length of the side opening (32); when the sealing plate (33) is in the air collecting box (3), the sealing plate (33) can rotate around its own geometric center within its own geometric plane.

5. The anaerobic three-phase separation system according to claim 4, characterized in that: The threaded fastener (34) is a bolt, and the bolt is connected to the side wall of the gas collecting box (3) and the sealing plate (33). A square frame-shaped pressing plate (35) is fixedly provided on one side of the sealing plate (33) close to the reaction tank (1). The thickness of the pressing plate (35) is greater than the thickness of the sealing plate (33), and the pressing plate (35) is provided with a threaded hole (36) adapted to the bolt.

6. The anaerobic three-phase separation system according to claim 1, characterized in that: One end of the reflection plate (51) close to the gas collecting box (3) extends into the inner side of the gas collecting box (3).

7. The anaerobic three-phase separation system according to claim 6, characterized in that: The reflector plate (51) is provided with an exhaust pipe (516), the exhaust pipe (516) being arranged vertically, the movable cover (517) comprising a top cover plate (5171) and a peripheral wall (5172), the peripheral wall (5172) of the movable cover (517) being sleeved on the exhaust pipe (516), the exhaust hole (5173) being opened in the peripheral wall (5172), and the edge of the exhaust hole (5173) being tangent to the top cover plate (5171).

8. The method for using the anaerobic three-phase separation system according to claim 1, characterized in that: The steps include: During the process of injecting sewage into the reaction tank (1) through the water inlet pipe (11), clean water is simultaneously injected into the air collecting box (3) through the water supply pipe (6), so that the clean water occupies the space in the air collecting box (3).

Images