Anaerobic three-phase separation system and use method thereof

Abstract

The invention discloses an anaerobic three-phase separation system and a use method thereof.The anaerobic three-phase separation system comprises a reaction tank and a gas collection tank, the gas collection tank is located on the outer side face of the reaction tank, and the gas collection tank and the reaction tank are separated by the side wall of the reaction tank; a reflecting plate array is arranged on the inner side of the reaction tank, the reflecting plate array comprises a plurality of reflecting plates, each reflecting plate is of a long and narrow folded plate structure, each reflecting plate is provided with two side wings, a downward included angle is formed between the two side wings, the side wall of the reaction tank is provided with an air vent allowing the end of each reflecting plate to be connected in an inserted mode, and the air vents communicate with the gas collection box and the reaction tank; a side opening is formed in one side, far away from the reaction tank, of the gas collection tank, and the gas collection tank is provided with a sealing plate for sealing the side opening; a gas-liquid separation chamber is arranged 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. According to the gas collection tank, the sealing plate can be detached, so that the side opening and the ventilation opening are exposed, and a worker can wash the reflecting plate through the ventilation opening.

Description

Technical Field

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

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

[0003] The internal circulation anaerobic reactor is equipped with a three-phase separation structure, which can separate biogas, water and sludge sediment. The main component of the three-phase separation is the reflective plates distributed in an array. After long-term use, sludge will adhere to the reflective plates. The sludge adheres to the reflective plates, which will affect the efficiency of the reflective plates in separating biogas and easily block the biogas delivery pipes connected to the reflective plates. In addition, because the reflective plates are installed in a closed space, it is difficult to clean the reflective plates. Summary of the invention

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

[0005] The present application provides an anaerobic three-phase separation system and a method for using the same, which adopts the following technical solutions: An anaerobic three-phase separation system comprises a reaction tank and an air collecting box, wherein the air collecting box is located on the outer side of the reaction tank, and the side wall of the reaction tank separates the air collecting box from the reaction tank; a reflector array is provided on the inner side of the reaction tank, and the reflector array comprises a plurality of reflectors, wherein the reflector is a narrow and long folding plate structure, and the reflector has two side wings, and a downward angle is formed between the two side wings; a vent is provided on the side wall of the reaction tank for plugging the end of the reflector, and the vent connects the air collecting box and the reaction tank; a side opening is provided on the side of the air collecting box away from the reaction tank, and the air collecting box is provided with a sealing plate for closing the side opening; a gas-liquid separation chamber is provided on the top of the reaction tank, and a lifting air pipe is connected between the bottom wall of the gas-liquid separation chamber and the top wall of the air collecting box.

[0006] 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, and the organic matter in the sewage forms biogas through anaerobic fermentation. When the biogas floats to the reflector array, it enters the gas collecting box through the vent under the guidance of the reflector, and then flows to the gas-liquid separation chamber through the lifting air pipe for gas-liquid separation. After the anaerobic three-phase separation system has been used for a long time, a lot of sludge will be attached 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 vent, so that the staff can rinse the reflector through the vent to restore the surface of the reflector to a smooth state, which is conducive 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 collecting box first, and then discharging it from the gas collecting box into the gas-water separation chamber, it helps to reduce the blockage of the biogas transmission pipeline.

[0007] Optionally, the reflective plate is detachably connected to the reaction tank, and a supporting structure for supporting the reflective plate is provided on a side of the reaction tank away from the gas collecting box.

[0008] By adopting the above technical solution, the reflector plate and the reaction tank are detachably connected, so that the reflector plate can be taken out of the reaction tank for more comprehensive cleaning. When the reflector plate is installed in the reaction tank, one end of the reflector plate is positioned by the vent, and the other end is supported by the supporting structure, so that the installation state of the reflector plate remains stable.

[0009] Optionally, a wedge-shaped piece is provided at one end of the reflector plate close to the air collecting box, the wedge-shaped piece abuts against the edge of the vent, and the thick end of the wedge-shaped piece is located in the air collecting box.

[0010] By adopting the above technical solution, when the reflector is installed on the reaction tank, the wedge-shaped piece can press against the edge of the vent, so that the installation state of the reflector is more stable.

[0011] Optionally, the side opening and the sealing plate are both rectangular, the sealing plate is located on the inner side of the air collecting box, and the sealing plate and the air collecting box are connected by 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 air collecting box, the sealing plate can rotate around its own geometric center in its own geometric plane.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] Optionally, one end of the reflective plate close to the gas collecting box extends into the inner side of the gas collecting box.

[0016] 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.

[0017] 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.

[0018] By adopting the above technical solution, the reflector, bottom plate and end plate can work together to separate the reaction tank from the gas collecting box. As the biogas gathers in the lower surface area of ​​the reflector, when the lifting force of the biogas is greater than the gravity of the movable cover, the biogas can push the movable cover open and enter the inner side of the gas collecting box. When the lifting force of the biogas decreases, the movable cover falls back to cover the exhaust hole, so as to reduce the sewage and sludge in the reaction tank from entering the gas collecting box.

[0019] Optionally, the reflective plate is provided with an exhaust pipe, the exhaust pipe is vertically arranged, 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, the exhaust hole is opened in the peripheral wall, and the edge of the exhaust hole is tangent to the top cover plate.

[0020] By adopting the above technical solution, the exhaust pipe is connected to the space on the upper and lower surfaces of the reflector, and the biogas collected below the reflector is discharged into the gas collecting box through the exhaust pipe. When the biogas enters the gas collecting box from the exhaust pipe, it is only necessary to lift the movable cover upward by a small height to connect the exhaust hole with the inner cavity of the exhaust pipe. When the movable cover moves up and down, the exhaust pipe guides the movable cover.

[0021] Optionally, the air collecting box is provided with a water supply pipe.

[0022] By adopting the above technical solution, after the sewage in the reaction tank is drained, the gas collecting box is flushed using the water supply pipe, so that the gas collecting box can be kept clean, which is beneficial to improving the working environment.

[0023] A method for using an anaerobic three-phase separation system comprises the following steps: while a water inlet pipe is injecting sewage into a reaction tank, a water supply pipe is used to inject clean water into an air collecting box, so that the clean water occupies the space in the air collecting box.

[0024] By adopting the above technical solution, clean water is used to occupy the space in the air collecting box, which can reduce the solid matter in the sewage from entering the air collecting box, which is beneficial to keeping the air collecting box clean.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: After the anaerobic three-phase separation system has been used for a long time, a lot 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 vent, so that the staff can flush the reflector through the vent to restore the surface of the reflector to a smooth state, which is beneficial to ensure the separation effect of the three-phase separation system.

[0026] Since the sealing plate is installed on the inner side of the air collecting box, when the water pressure inside the air collecting box acts on the sealing plate, the sealing effect between the sealing plate and the side opening edge can be enhanced, thereby reducing leakage at the connection between the sealing plate and the side opening edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of the anaerobic three-phase separation system of Example 1.

[0028] Figure 2 It is a schematic diagram of a half-section state of the anaerobic three-phase separation system in Example 1.

[0029] Figure 3 It is a schematic diagram of the structure of the reflection plate of Example 1.

[0030] Figure 4 It is a schematic diagram of Example 1 for illustrating the positional relationship between the side opening and the sealing plate.

[0031] Figure 5 It is a schematic diagram of Example 1 for illustrating the connection relationship between the gas collecting box and the sealing plate.

[0032] Figure 6 It is a schematic diagram of the structure of the reflection plate of Example 2.

[0033] Description of reference numerals: 1. Reaction tank; 11. Water inlet pipe; 12. Sludge discharge pipe; 13. Water outlet pipe; 14. Air vent; 2. Gas-liquid separation tank; 20. Gas-liquid separation chamber; 21. Drainage pipeline; 22. Exhaust pipeline; 3. Gas collecting box; 31. Lifting air pipe; 32. Side opening; 33. Sealing plate; 331. Sealing gasket; 34. Threaded fastener; 35. Pressing plate; 36. Threaded hole; 4. Rotating water distributor; 5. Reflector array; 51. Reflector; 511. Side wing; 512. Support structure; 513. Wedge; 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

[0034] The following is combined with Figure 1-6 This application is described in further detail. Example 1

[0035] The present application embodiment discloses an anaerobic three-phase separation system. 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 collecting boxes 3. A water inlet pipe 11 and a sludge discharge pipe 12 are provided at the bottom of the reaction tank 1, and a water outlet pipe 13 is provided at the top of the reaction tank 1; 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 from the reaction tank 1; a rotary water distributor 4 and two sets of reflector arrays 5 are provided on the inner side of the reaction tank 1, and the rotary water distributor 4 is located at the bottom of the reaction tank 1, and the rotary water distributor 4 is used to evenly distribute the sewage entering the reaction tank 1.

[0036] Two groups of reflective plate arrays 5 are located above the rotary water distributor 4 and are arranged at vertical intervals. The reflective plate arrays 5 include multiple reflective plates 51. The side wall of the reaction tank 1 is provided with a vent 14 for plugging the end of the reflective plate 51. The vent 14 corresponds one-to-one with the reflective plate 51. The vent 14 connects the gas collecting box 3 and the reaction tank 1. The reflective plate 51 is used to introduce the biogas generated by the reaction in the sewage into the gas collecting box 3.

[0037] The gas-liquid separation tank 2 is located at 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 separated and formed at the top of the reaction tank 1 by a partition. A lifting gas pipe 31 is connected between the bottom wall of the gas-liquid separation chamber 20 and the top wall of each gas collecting box 3, respectively. The gas-liquid separation chamber 20 is provided with a drainage pipeline 21 and an exhaust pipeline 22. The drainage pipeline 21 discharges the water in the gas-liquid separation chamber 20 or returns it to the reaction tank 1, and the exhaust pipeline 22 discharges the biogas in the gas-liquid separation chamber 20 to a specific space.

[0038] When the anaerobic three-phase separation system is working, sewage enters the inner side of the reaction tank 1 from the water inlet pipe 11 to react and produce biogas. During the upward movement of the biogas and sewage, they successively pass through two groups of reflector arrays 5. The reflector array 5 guides the biogas into the gas collecting box 3, and then enters the gas-liquid separation chamber 20 through the lifting gas pipe 31 for gas-liquid separation. During the flow of sewage in the reaction tank 1 to the outlet pipe 13, the solid matter is blocked by the reflector array 5 and settles to the bottom of the reaction tank 1, so that the sewage is separated into solid and liquid.

[0039] Reference Figure 2 and Figure 3 The reflector 51 is a narrow and long folded plate structure, and has two side wings 511, and a downward angle is formed between the two side wings 511. One end of the reflector 51 is plugged into the corresponding vent 14 and extends into the inner side of the gas collecting box 3. A supporting structure 512 for supporting the reflector 51 is provided on the side of the reaction tank 1 away from the gas collecting box 3. The supporting structure is a plate fixed to the inner wall of the reaction tank 1.

[0040] 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.

[0041] Reference Figure 1 , Figure 4 and Figure 5A 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.

[0042] 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.

[0043] 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.

[0044] After a long period of use, a large amount of sludge will adhere to the surface of the reflector 51 of the anaerobic three-phase separation system of the embodiment of the present application. In this case, the reaction tank 1 can be emptied, and then the sealing plate 33 can be removed to expose the side opening 32 and the vent 14, so that the staff can flush the reflector 51 through the vent 14 to restore the surface of the reflector 51 to be smooth, which is conducive to ensuring the separation effect of the three-phase separation system. On the other hand, by first collecting the biogas collected under each reflector 51 into the gas collecting box 3 and then discharging it from the gas collecting box 3 into the gas-water separation chamber, the resistance of the biogas collection and discharge process can be reduced.

[0045] Reference Figure 1 The side wall of the gas collecting box 3 is provided with a water supply pipe 6, and one end of the water supply pipe 6 away from the gas collecting box 3 is connected to the municipal water supply pipe 6 network. Before removing the sealing plate 33, the internal space of the gas collecting box 3 can be flushed with the water supply pipe 6 to improve the working environment.

[0046] The present embodiment also discloses a method for using the above-mentioned anaerobic three-phase separation system, comprising the following steps: while the water inlet pipe 11 is injecting sewage into the reaction tank 1, clean water is simultaneously injected into the air collecting box 3 using the water supply pipe 6, so that the clean water occupies the space in the air collecting box 3 to reduce the amount of sewage entering the air collecting box 3. Example 2

[0047] Reference Figure 6 The difference between this embodiment and embodiment 1 is that in this embodiment, a bottom plate 514 and an end plate 515 are provided at one end of the reflector 51 close to the air collecting box 3, the bottom plate 514 passes through the vent 14, and the two sides of the bottom plate 514 are respectively and closedly connected to the two side wings 511 of the reflector 51, and the end plate 515 is connected to the bottom plate 514 and the reflector 51 at the same time, and the reflector 51, the bottom plate 514 and the end plate 515 together form a cylindrical space with one end closed.

[0048] The reflector 51 is provided with an exhaust pipe 516, which is vertically arranged. The upper end of the exhaust pipe 516 has a conical surface 5161. The upper end of the exhaust pipe 516 is provided with a movable cover 517, which 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. The peripheral wall 5172 of the movable cover 517 is provided with an exhaust hole 5173, which is a long hole. The length direction of the exhaust hole 5173 is consistent with the length direction of the exhaust pipe 516, and the edge of the exhaust hole 5173 is tangent to the top cover plate 5171. The exhaust hole 5173 can be communicated with the inner space of the gas collecting box 3, and the upper surface of the reflector 51 is provided with a movable cover 517 for shielding the exhaust hole 5173.

[0049] The pipe wall of the exhaust pipe 516 is provided with a limiter 518 for limiting the lifting and lowering distance of the movable cover 517 . The limiter 518 in this embodiment is a screw threadedly connected to the pipe wall of the exhaust pipe 516 .

[0050] The reflective plate 51, the bottom plate 514 and the end plate 515 can work together to separate the reaction tank 1 from 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 mutual circulation between the sewage in the reaction tank 1 and the clean water in the gas collecting box 3 can be reduced. As the biogas gathers in the lower surface area of ​​the reflective plate 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 inner side of the gas collecting box 3. When the lifting force of the biogas decreases, the movable cover 517 falls back 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.

[0051] In addition, when the gas collecting box 3 and the reaction tank 1 are separated from each other, a sewage pipe with a switch valve can be provided on the bottom wall of the gas collecting box 3 as needed, and the sewage pipe can be connected to the reaction tank 1 or discharged externally.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in 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), and wherein a downward angle is formed between the two side wings (511); and wherein the reaction tank (1) The side wall of the reaction tank (1) is provided with a vent (14) for plugging the end of the reflection plate (51), and the vent (14) connects the gas collecting box (3) and the reaction tank (1); the gas collecting box (3) is provided with a side opening (32) on a side away from the reaction tank (1), and the gas collecting box (3) is provided with a sealing plate (33) for closing the side opening (32); the top of the reaction tank (1) is provided with a gas-liquid separation chamber (20), and 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).

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 1, characterized in that: 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).

8. The anaerobic three-phase separation system according to claim 7, 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).

9. The anaerobic three-phase separation system according to claim 1, characterized in that: The air collecting box (3) is provided with a water supply pipe (6).

10. The method for using the anaerobic three-phase separation system according to claim 9, 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).

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