Lifting type circulating flow facultative bioreactor

Abstract

The utility model discloses a lifting type circulating flow facultative anaerobic bioreactor which comprises a reactor body, a central cylinder is arranged in the center of the reactor body, a central cylinder cover is arranged at the top of the central cylinder, a space for water to pass through is formed by the central cylinder cover and the top of the central cylinder, and a water inlet pipe is arranged on the side portion of the reactor body and extends into the central cylinder. A group of return pipes are arranged on the outer surface of the central cylinder along the circumferential direction of the central cylinder, the return pipes are communicated with the central cylinder, a gas stripping pipe is arranged at the top of the reactor body, the gas stripping pipe penetrates through a central cylinder cover and extends into the central cylinder, and the gas stripping pipe is arranged at the top of the reactor body, penetrates through the central cylinder cover and extends into the central cylinder. Sewage forms an up-and-down circulating flow state in the reactor under the action of gas stripping, and sludge is in a suspended state under the disturbance of the sewage in the circulating flow state, so that full contact between hydrolytic acidification zoogloea and water is ensured, and local short flow and sludge aggregation are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and in particular to a lifting type circulating flow aeration bioreactor. Background Art

[0002] Anaerobic processes are widely used in the pretreatment of high-concentration organic wastewater due to their high efficiency, low investment, and low operating costs. Anaerobic processes can be divided into two distinct stages based on differences in biological metabolic activity: hydrolysis and acidification, which hydrolyzes large, insoluble organic matter into smaller, soluble organic matter, which is then further decomposed into acetic acid and volatile fatty acids. The second stage, anaerobic methanogenesis, involves methanogens converting acetic acid and volatile fatty acids into CO2 and CH4. Compared to the hydrolysis and acidification stage, the anaerobic process produces CH4, a flammable gas that poses a safety hazard in wastewater treatment plants. Furthermore, anaerobic methanogens have more stringent environmental requirements, often causing the anaerobic system to fail due to shock. The hydrolysis and acidification stage is relatively stable and better able to withstand water quality shocks. Furthermore, in actual projects, some enterprises' high-concentration wastewater contains significant amounts of SO4. 2- , under anaerobic conditions SO4 2- It will be reduced to produce a large amount of H2S gas, which will inhibit the activity of microorganisms and reduce the efficiency of wastewater treatment. At the same time, there are safety hazards, which will make the operating environment around the sewage station poor.

[0003] Due to the frequent occurrence of safety accidents at sewage treatment plants, plant safety is receiving increasing attention from governments and businesses. Controlling the anaerobic process within the hydrolysis and acidification stage improves system stability and reduces layout restrictions. This process is expected to be more widely used in the future. Currently, most hydrolysis and acidification processes use rising and push-and-turn flow, which have high concentration gradients, a significant impact on microbial loads, poor bacterial activity, and low treatment efficiency. There is an urgent need for a shock-resistant, high-mass transfer, and efficient facultative anaerobic biochemical reaction system.

[0004] The utility model aims at the application of biological treatment process of high-concentration organic wastewater, and the research and development of a high-efficiency aerobic bioreactor will have practical significance. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a lifting circulating flow and oxidation bioreactor, which uses the air lift effect to form an up and down circulating flow state of sewage in the reactor, avoiding the problem of sludge deposition caused by mechanical stirring.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A lifting circulating flow aerobic bioreactor comprises a reactor body, wherein a central tube is provided in the center of the reactor body, a central tube cover is provided on the top of the central tube, the central tube cover and the top of the central tube form a space for water to pass through, a water inlet pipe is provided on the side of the reactor body, the water inlet pipe extends into the central tube, a group of return pipes are provided on the outer surface of the central tube along its circumferential direction, the return pipes are connected with the central tube, and an air stripping pipe is provided on the top of the reactor body, the air stripping pipe passes through the central tube cover and extends into the central tube.

[0008] Furthermore, the water outlet of the water inlet pipe is vertically downward, and the vertical center line of the water outlet coincides with the central axis of the central tube.

[0009] Furthermore, the return pipe connected to the central tube is installed horizontally, and the water flow direction of the water inlet pipe is perpendicular to the water flow direction of the return pipe.

[0010] Furthermore, the diameter of the center tube cover is 1.2 to 1.3 times the diameter of the center tube.

[0011] Furthermore, an air inlet flow meter is provided on the air inlet of the lift pipe, and its air outlet is vertically upward. The vertical center line of the air lift pipe exhaust port coincides with the central axis of the central tube, and the air lift pipe outlet is located in the upper middle part of the central tube.

[0012] Furthermore, an overflow trough is installed around the inner wall of the reactor body, and the overflow trough is sealed to the inner wall of the reactor body through a gasket and fixing screws. A solid-liquid separation baffle is provided outside the overflow trough, and the solid-liquid separation baffle is fixed to the overflow trough and the inner wall of the reactor body through a fixing rod.

[0013] Furthermore, the overflow trough has a vertical height of 0.25~0.3m, the top needs to be kept horizontal, and the horizontal width is 0.25~0.3m; the solid-liquid separation baffle is inclined upward, the top of the solid-liquid separation baffle is higher than the liquid level, the bottom is below the overflow trough, and maintains a water-passing distance from the inner wall of the reactor body.

[0014] Furthermore, a filler is installed in the reactor body, and the filler is fixed by a steel structure, and the filling amount is determined by calculation based on the biodegradation amount.

[0015] Furthermore, a pH meter installation port and a DO installation port are provided on the top of the reactor body.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1) The technical solution of the utility model is to provide an air stripping pipe on the top of the reactor body. The air stripping pipe passes through the central tube cover and extends into the central tube. The air stripping effect is used to form an up-and-down circulation flow of sewage in the reactor. The sludge is suspended under the disturbance of the circulating sewage, ensuring that the hydrolyzed acidified bacterial micelles are in full contact with water and preventing local short-circuiting and sludge accumulation.

[0018] 2) By adjusting the airflow intensity during the gas stripping process, the sewage treatment system in the reactor can be kept in a slightly oxygenated state. Dissolved oxygen will inhibit the growth of methanogens, thereby controlling the microbial metabolic reaction stage;

[0019] 3) Compared with the traditional sewage treatment method through stirring, the utility model combines aeration and oxygenation with air stripping, achieving water air stripping at the same time as oxygenation, so that the sewage forms an up-and-down circulation flow in the reactor, avoiding the problem of sludge precipitation;

[0020] 4) The outlet of the water inlet pipe of this utility model is vertically downward in the central tube, perpendicular to the flow direction of the return mud-water mixture. The kinetic energy of the sewage flowing out of the water inlet pipe outlet is used to quickly collide with the return sewage. The direction of the water flow changes after the collision, forming turbulence in the mixing area, ensuring uniform mixing, while avoiding local short-flow and sludge deposition in the central tube.

[0021] 5) The utility model separates mud and water through the solid-liquid separation baffle and the overflow trough, and does not need to set up a sedimentation tank. It is simple to operate, has high space utilization, small footprint, and low construction investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the reactor of the utility model;

[0023] Figure 2 for Figure 1 Floor plan;

[0024] Figure 3 This is a schematic diagram of the clarified water outlet area of ​​the utility model.

[0025] In the figure: 1. Water inlet pipe; 2. Water inlet flowmeter; 3. Air stripping pipe; 4. Air inlet flowmeter; 5. Reflux pipe; 6. Center tube; 7. Center tube cover; 8. Packing; 9. Solid-liquid separation baffle; 10. Overflow tank; 11. pH meter installation port; 12. DO installation port; 13. Water outlet pipe; 14. Reactor body; 15. Fixing rod; 16. Gasket; 17. Fixing screw. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings, but the scope of protection of the present invention is not limited to the described scope.

[0027] Please refer to Figure 1-2 The lifting circulating flow aerobic bioreactor includes a reactor body 14, which is circular or square with a diameter or side length of 5 to 9 meters. A central tube 6 is provided in the center of the reactor body 14. The central tube 6 coincides with the central axis of the reactor body 14. The bottom of the central tube 6 is fixed to the bottom of the reactor body 14. The diameter is 0.6 to 3.0 meters, and the top is 0.2 to 0.5 meters above the liquid level. The top of the central tube 6 is provided with a central tube cover 7. The diameter of the central tube cover 7 is 1.2 to 1.3 times the diameter of the central tube 6. The central tube cover 7 and the top of the central tube 6 form a 0.2-0.5 meter space for water to pass through.

[0028] A water inlet pipe 1 is installed on the side of the reactor body 14. The water inlet pipe 1 extends into the central tube 6. The water outlet of the water inlet pipe 1 is vertically downward, with the vertical centerline of the water inlet pipe 1 coinciding with the centerline of the central tube 6. The water outlet is 0.3-0.8m from the bottom of the central tube 6. The water inlet pipe 1 is installed with an inlet flowmeter 2. The sewage flow rate in the water inlet pipe 1 is not less than 1.5m / s.

[0029] A group of return pipes 5 are provided on the outer surface of the central tube 6 along its circumferential direction. The return pipes 5 are connected to the central tube 6 and are installed horizontally. The water flow direction of the outlet water of the inlet pipe 1 is perpendicular to the water flow direction of the return pipe 5. The center line of the return pipe 5 is 0.2~0.5m away from the bottom of the reactor 14. The number of the return pipes 5 is 6~12. The sewage flow rate is 0.2~0.6m / S. The pipe diameter is determined based on 20~40 times the water inlet volume.

[0030] The lower part of the central tube 6 of the reactor of the present invention is the water inlet mixing zone, and the outlet of the water inlet pipe 1 is vertically downward in the central tube 6, perpendicular to the flow direction of the returned mud-water mixture. The kinetic energy of the sewage flowing out of the outlet of the water inlet pipe 1 is used to quickly collide with the returned sewage. After the collision, the direction of the water flow is changed, and turbulence is formed in the mixing zone to ensure uniform mixing, while avoiding the occurrence of local short-flow and sludge deposition in the central tube.

[0031] A stripping tube 3 is provided at the top of the reactor body 14. Compressed air enters the central tube 6 through the stripping tube 3. The stripping tube 3 extends through the central tube cover 7 and into the central tube 6. An air inlet flowmeter 4 is located at the air inlet of the stripping tube 3. The air outlet of the stripping tube 3 is vertically upward. The vertical centerline of the air outlet of the stripping tube 3 coincides with the central axis of the central tube 6. The air outlet of the stripping tube 3 is located in the upper middle portion of the central tube 6.

[0032] The present invention incorporates an air lift pipe 3 at the top of the reactor body 14, which extends through the central tube cover 7 and into the central tube 6. This air lift effect creates an upward and downward circulating flow of sewage within the reactor. The sludge is suspended by the disturbance of the circulating sewage, ensuring full contact between the hydrolytic and acidifying bacterial flocs and the water, while preventing local short-circuiting and sludge accumulation. Furthermore, during the air lift cycle, aeration maintains a slightly oxygenated state within the sewage treatment system. Dissolved oxygen inhibits the growth of methanogens, thereby controlling the microbial metabolic reaction phase.

[0033] The reactor's gas lift reflux zone is located in the upper middle portion of central tube 6. The upper portion of central tube 6 is above the water level and is fitted with a central tube cover 7. This cover is larger in diameter than central tube 6 and maintains a distance from the top of central tube 6, creating a passage for the reflux liquid. The lower edge of central tube cover 7 is below the liquid level. A gas lift pipe passes through the central tube cover and into the central tube, with its outlet located below the liquid level and pointing vertically upward.

[0034] The reactor area outside the central tube 6 is the biodegradation zone of the reactor of the present invention. This area has a pH meter mounting port and a DO meter mounting port at the top for monitoring dissolved oxygen and pH conditions. A biological filler is installed in the middle to increase the biomass of the reactor. Specifically, a pH meter mounting port 11 and a DO mounting port 12 are provided at the top of the reactor body 14. Filler 8 is installed within the reactor body 14 and secured by a steel structure. The filling amount is calculated based on the amount of biodegradation. The top of the filler 8 is maintained at a distance of at least 1 meter from the liquid level line, and the bottom of the filler 8 is maintained at a distance of at least 1.5 meters from the bottom of the reactor body 14.

[0035] Please refer to Figure 3 The liquid level line area around the reactor's inner wall represents the clarified water outlet zone of the present invention. This area consists of solid-liquid separation baffles 9 and overflow troughs 10 installed along the reactor's inner wall. The solid-liquid separation baffles 9 are angled horizontally, with their upper edge above the liquid level and their lower edge positioned below the overflow trough 10, maintaining a distance from the reactor's inner wall. This serves as a water and sludge discharge channel. The clarified liquid overflows into the overflow trough 10, which is connected to an outlet pipe 13.

[0036] Specifically, the overflow trough 10 is installed along the inner side of the reactor body 14 and is sealed to the inner wall of the reactor body 14 through gaskets 16 and fixing screws 17. The vertical height of the overflow trough 10 is 0.25~0.3m, the top needs to be kept horizontal, and the horizontal width is 0.25~0.3m.

[0037] A solid-liquid separation baffle 9 is located outside the overflow trough 10. This baffle 9 is tilted upward, with its top above the liquid level and its bottom below the overflow trough 10. It maintains a sufficient water-passing distance from the inner wall of the reactor body 14. The baffle 9 is secured to the overflow trough 10 and the inner wall of the reactor body 14 via fixing rods 15.

[0038] The utility model separates mud and water through the solid-liquid separation baffle 9 and the overflow trough 10, and does not need to set up a sedimentation tank. It is simple to operate, has high space utilization, small floor space and low construction investment.

Claims

1. A lifting circulating flow aerobic bioreactor, comprising a reactor body (14), characterized in that A central tube (6) is provided at the center of the reactor body (14), a central tube cover (7) is provided at the top of the central tube (6), and a space for water to pass through is formed by the central tube cover (7) and the top of the central tube (6). A water inlet pipe (1) is provided on the side of the reactor body (14), and the water inlet pipe (1) extends into the central tube (6). A group of reflux pipes (5) are provided on the outer surface of the central tube (6) along its circumferential direction, and the reflux pipes (5) are connected with the central tube (6). A gas lift pipe (3) is provided at the top of the reactor body (14), and the gas lift pipe (3) passes through the central tube cover (7) and extends into the central tube (6).

2. The lifting type circulating flow aerobic bioreactor according to claim 1, characterized in that The water outlet of the water inlet pipe (1) is vertically downward, and the vertical center line of the water outlet coincides with the central axis of the central tube (6).

3. The lifting type circulating flow aerobic bioreactor according to claim 2, characterized in that The return pipe (5) connected to the central tube (6) is installed horizontally, and the water flow direction of the water inlet pipe (1) is perpendicular to the water flow direction of the return pipe (5).

4. The lifting type circulating flow aerobic bioreactor according to claim 1, characterized in that The diameter of the central tube cover (7) is 1.2 to 1.3 times the diameter of the central tube (6).

5. The lifting type circulating flow aerobic bioreactor according to claim 1, characterized in that An air inlet flow meter (4) is provided on the air inlet of the air lift pipe (3), and its air outlet is vertically upward. The vertical center line of the air lift pipe (3) exhaust port coincides with the central axis of the central tube (6), and the air outlet of the air lift pipe (3) is located in the upper middle part of the central tube (6).

6. The lifting type circulating flow aerobic bioreactor according to claim 1, characterized in that An overflow trough (10) is installed around the inner wall of the reactor body (14). The overflow trough (10) is sealed with the inner wall of the reactor body (14) through a gasket (16) and a fixing screw (17). A solid-liquid separation baffle (9) is provided outside the overflow trough (10). The solid-liquid separation baffle (9) is fixed to the overflow trough (10) and the inner wall of the reactor body (14) through a fixing rod (15).

7. The lifting type circulating flow aerobic bioreactor according to claim 6, characterized in that The overflow trough (10) has a vertical height of 0.25 to 0.3 m, the top of which needs to be kept horizontal, and a horizontal width of 0.25 to 0.3 m; the solid-liquid separation baffle (9) is inclined upward, the top of which is higher than the liquid level, the bottom of which is below the overflow trough (10), and maintains a water-passing distance from the inner wall of the reactor body (14).

8. The lifting circulating flow aerobic bioreactor according to claim 1, characterized in that A filler (8) is installed in the reactor body (14), and the filler (8) is fixed by a steel structure, and the filling amount is determined by calculation based on the biodegradation amount.

9. The lifting type circulating flow aerobic bioreactor according to claim 1, characterized in that The top of the reactor body (14) is provided with a pH meter installation port (11) and a DO installation port (12).

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