Biological fluidized bed tower type water treatment system

Abstract

The utility model relates to a biological fluidized bed tower-type water treatment system, which belongs to the technical field of sewage treatment, and comprises a tower body, the interior of the tower body is divided into an aerobic zone, an anoxic zone and a settling zone through an inner cylinder wall, a flow guide wall and a mud bucket wall, and a gas lifting device is arranged to communicate the interior of the aerobic zone with the interior of the anoxic zone. According to the present invention, the anoxic tank, the aerobic tank and the secondary sedimentation tank are organically combined to form the highly integrated tower reactor, and the occupied area is small compared with the traditional biochemical process; the biological fluidization system is higher in sludge concentration, can tolerate higher salinity, higher COD (Chemical Oxygen Demand) and higher nitrogen-containing wastewater, and is higher in load impact resistance; the oxygen utilization rate of the biological fluidized bed system is improved by 50% compared with that of traditional aeration, the sludge backflow and nitrification liquid circulation of the biological fluidized bed system synchronously adopt the gas stripping technology, a sludge backflow pump and a nitrification liquid backflow pump are reduced, and the operation energy consumption of the system is greatly reduced.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a biological fluidized bed tower water treatment system. Background Art

[0002] With the advancement of industrialization, China's industrial wastewater discharge has shown an increasing trend year by year. The increase in industrial wastewater discharge has not only aggravated the shortage of water resources, but may also lead to environmental problems such as water pollution and soil pollution, thereby posing a potential threat to human survival and development.

[0003] The existing Chinese patent with reference number CN115893665B discloses an electro-flocculation coupled anaerobic aeration biological fluidized bed biochemical low-temperature sewage treatment device, which includes an electro-flocculation unit and a biological treatment unit. The biological treatment unit includes an anaerobic tank, an anoxic tank and an aerobic tank connected in sequence. The aerobic tank includes several unit tanks, and the anoxic tank is connected to each unit tank, which improves the sewage treatment device's ability to resist low temperatures and improves water purification capacity.

[0004] The aerobic tank is composed of multiple unit tanks, and the biological treatment unit includes an oil separation and adjustment tank. The required connection and arrangement between the various treatment units result in a large footprint of the overall equipment, poor treatment effect for high-salt, high-COD, and high-nitrogen wastewater, and great limitations in use. Utility Model Content

[0005] In order to reduce the overall footprint of the water treatment system, improve treatment efficiency, and especially enhance the treatment efficiency of high-salt, high-COD, and high-nitrogen wastewater, the present application provides a biological fluidized bed tower water treatment system.

[0006] The present application provides a biological fluidized bed tower water treatment system that adopts the following technical solutions:

[0007] A biological fluidized bed tower water treatment system includes a tower body, wherein an inner cylinder wall, a guide wall, and a mud hopper wall are fixedly mounted within the tower body; the bottom of the inner cylinder wall is fixed to the inner wall of the tower body bottom, the top of the inner cylinder wall is fixedly connected to the bottom of the guide wall, and a distance exists between the top of the guide wall and the inner wall of the tower body top; the mud hopper wall is located within the guide wall, a distance exists between the outer wall of the mud hopper wall and the inner wall of the guide wall, the bottom of the mud hopper wall is open and communicates with the interior of the inner cylinder wall, and a distance exists between the top of the mud hopper wall and the inner wall of the tower body top; and a distance exists between the inner cylinder wall and the guide wall and the vertical inner wall of the tower body; The internal area of ​​the inner tube wall is the anoxic zone, the area between the outer wall of the inner tube wall and the inner wall of the tower body is the aerobic zone, and the internal area of ​​the mud hopper wall is the sedimentation zone; an aeration pipe is provided in the tower body, and the aeration pipe is located near the bottom of the tower body and in the aerobic zone; a water outlet weir, a mud discharge pipe, a water inlet pipe and a gas lift pipe are provided on the tower body, the water outlet weir is located at the top of the tower body and connected to the sedimentation zone, the water inlet pipe is connected to the anoxic zone, the mud discharge pipe is located at the bottom of the tower body and connected to the bottom of the anoxic zone, one end of the gas lift pipe is connected to the interior of the anoxic zone, and the other end is connected to the interior of the aerobic zone and is located above the aeration pipe.

[0008] By adopting the above technical solution, the wastewater to be treated enters the anoxic zone through the water inlet pipe. There, it undergoes organic matter decomposition reactions and organic nitrogen conversion reactions, producing small-molecule organic matter and ammonia nitrogen. The water produced in the anoxic zone is called anoxic zone produced water. This water passes through a gas lift device and enters the aerobic zone. Aeration pipes provide oxygen and power, and organic pollutants are decomposed into water and carbon dioxide, and ammonia nitrogen is decomposed into nitrate nitrogen. Part of the aerobic zone produced water flows back to the anoxic zone for denitrification, while the remaining part enters the sedimentation zone. After sedimentation, the sludge falls back to the anoxic zone and is discharged through the sludge discharge pipe. The supernatant in the sedimentation zone is discharged through the effluent weir. The entire biological fluidized bed tower water treatment system is highly integrated and space-saving: it integrates aerobic decarbonization, anoxic denitrification, and sludge sedimentation in a compact structure with a small footprint, improving treatment efficiency and expanding its scope of application.

[0009] Optionally, a guide plate is fixed in the tower body, the guide plate is located in the aerobic zone and above the aeration pipe, and the aeration pipe is located between the guide plate and the inner tube wall.

[0010] By adopting the above technical solution and utilizing the guide plate, the circulation flow of the liquid in the aerobic zone is realized, thereby further improving the oxygen utilization rate and the system's ability to resist load impact.

[0011] Optionally, the guide wall and the mud hopper wall are both funnel-shaped.

[0012] By adopting the above technical solution, the funnel-shaped guide wall and mud hopper wall facilitate the return of part of the water produced in the aerobic zone to the anoxic zone, and the entry of part of the water produced in the aerobic zone into the sedimentation zone. In the sedimentation zone, the sludge is easily precipitated and falls back into the anoxic zone along the inclined mud hopper wall.

[0013] Optionally, the top of the mud hopper wall is higher than the top of the guide wall.

[0014] By adopting the above technical solution, the sludge in the mud hopper wall will form a supernatant in the sedimentation area after sedimentation. The setting method of the top of the mud hopper wall being higher than the top of the guide wall avoids the backflow of the supernatant and enables the supernatant to be discharged stably through the outlet weir.

[0015] Optionally, the bottom inner wall of the inner cylinder wall is centrally concave, and the exhaust pipe is connected to the anoxic zone and is located at the center of the concave bottom wall of the inner cylinder wall.

[0016] By adopting the above technical solution, the sludge settled in the sedimentation zone falls back into the anoxic zone, and is concentrated at the bottom center of the inner cylinder wall in accordance with the inclined shape of the bottom of the anoxic zone, which facilitates smooth discharge from the sludge discharge pipe.

[0017] Optionally, the height of the end of the gas lift pipe in the aerobic zone is higher than the height of the end of the gas lift pipe in the anoxic zone, and the height of the end of the gas lift pipe in the aerobic zone is lower than the position of the top of the guide plate.

[0018] By adopting the above technical solution, the presence of the aeration pipe begins to transport air into the aerobic zone between the guide plate and the inner cylinder wall. The gas-liquid mixture formed by the mixing of gas and liquid has a lower density than the previous pure liquid. In the system where the riser is located, due to aeration, the density of the mixture on one side decreases, creating a density difference in the liquid in the anoxic zone. According to the principles of physics, a fluid with low density is subject to upward buoyancy in a gravitational field, while a fluid with high density exerts downward pressure on the fluid with low density. This creates a pressure difference at both ends of the gas lift pipe, achieving the effect of the gas lift pipe pumping liquid from the anoxic zone to the aerobic zone, where the liquid impacts the guide plate and fully contacts the oxygen.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. Using air lift to replace nitrification liquid return and sludge return not only reduces the number of equipment, but also significantly reduces operating energy consumption, which is more than 30% lower than traditional processes;

[0021] 2. The guide plate is cleverly used to achieve circulation in the aerobic zone, further improving the oxygen utilization rate and the system's ability to resist load shock;

[0022] 3. Through ingenious structural design, the sedimentation area and the biochemical system are organically combined to form a three-phase separator structure, realizing the separation of gas, liquid and solid phases. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of an embodiment of the present application.

[0024] In the figure, 1. tower body; 11. anoxic zone; 12. aerobic zone; 13. sedimentation zone; 2. inner tube wall; 3. guide wall; 4. mud hopper wall; 41. outlet weir; 42. mud discharge pipe; 5. guide plate; 6. water inlet pipe; 7. gas lift pipe; 8. aeration pipe. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 This application is described in further detail.

[0026] The embodiments of the present application disclose a biological fluidized bed tower water treatment system.

[0027] refer to Figure 1 A biological fluidized bed tower water treatment system includes a tower body 1, in which an inner cylinder wall 2, a guide wall 3 and a mud hopper wall 4 are arranged. The top of the tower body 1 is connected to a water outlet weir 41, the middle of the tower body 1 is connected to a water inlet pipe 6, and the bottom of the tower body 1 is connected to a mud discharge pipe 42.

[0028] refer to Figure 1 The bottom of inner tube wall 2 is fixed to the bottom inner wall of tower body 1. The bottom inner wall of inner tube wall 2 is concave at the center. The top of inner tube wall 2 is fixedly connected to the bottom of guide wall 3. There is a distance between the top of guide wall 3 and the top inner wall of tower body 1. The bottom of guide wall 3 is connected to the interior of inner tube wall 2. The area inside inner tube wall 2 is anoxic zone 11, and there is a distance between the outer wall of inner tube wall 2 and the inner wall of tower body 1, and this area is aerobic zone 12.

[0029] refer to Figure 1 The hopper wall 4 is located inside the diversion wall 3. Both diversion wall 3 and hopper wall 4 are funnel-shaped with an open bottom, and the top of hopper wall 4 is higher than the top of diversion wall 3. There is a distance between the outer wall of hopper wall 4 and the inner wall of diversion wall 3. The bottom of hopper wall 4 is connected to the interior of inner cylinder wall 2. There is a distance between the top of hopper wall 4 and the top inner wall of tower body 1, and there is a distance between diversion wall 3 and the vertical inner wall of tower body 1. The area inside hopper wall 4 is the sedimentation zone 13.

[0030] refer to Figure 1 A guide plate 5, an aeration pipe 8 and a gas lift pipe 7 are provided in the tower body 1. The guide plate 5 is fixed vertically inside the tower body 1. The guide plate 5 is located in the aerobic zone 12. There is a distance between the guide plate 5 and the inner cylinder wall 2 and the inner wall of the tower body 1. There is also a distance between the bottom of the guide plate 5 and the inner wall of the bottom of the tower body 1. The aeration pipe 8 is located near the bottom of the tower body 1 and in the aerobic zone 12. The aeration pipe 8 is located between the guide plate 5 and the inner cylinder wall 2 and is located below the guide plate 5. The arrangement of the aeration pipe 8 and the guide plate 5 allows the liquid to form an aerobic circulating fluidized bed in the aerobic zone 12.

[0031] refer to Figure 1, the outlet weir 41 is located at the top of the tower body 1 and is connected to the sedimentation zone 13. The water inlet pipe 6 is connected to the anoxic zone 11. The mud discharge pipe 42 is located at the bottom of the tower body 1 and is connected to the bottom of the anoxic zone 11. The exhaust pipe is connected to the anoxic zone 11 and is located at the center of the depression at the bottom of the inner cylinder wall 2. A gas lift pipe 7 is provided in the tower body 1. One end of the gas lift pipe 7 is connected to the interior of the anoxic zone 11, and the other end is connected to the interior of the aerobic zone 12 and is located above the aeration pipe 8. The height of the end of the gas lift pipe 7 in the aerobic zone 12 is higher than the height of the end of the gas lift pipe 7 in the anoxic zone 11, and the position of the gas lift pipe 7 at the end of the aerobic zone 12 is lower than the position of the top of the guide plate 5.

[0032] The inner tube wall 2, the guide wall 3, the mud bucket wall 4 and the guide plate 5 can be fixed in the tower body 1 by connecting rods. The method is not unique, and the connecting rods are no longer shown in the figure. It is an existing fixing technology.

[0033] The implementation principle of a biological fluidized bed tower water treatment system in the embodiment of the present application is as follows: the wastewater to be treated enters the anoxic zone 11 through the water inlet pipe 6, and the wastewater to be treated undergoes organic matter decomposition reaction and organic nitrogen conversion reaction in the anoxic zone 11 to produce small molecular organic matter and ammonia nitrogen; the water produced in the anoxic zone 11 is called the anoxic zone 11 produced water, and the anoxic zone 11 produced water passes through the gas lift device and enters the aerobic zone 12. The aeration pipe 8 provides oxygen and power, and organic pollutants are decomposed into water and carbon dioxide, and ammonia nitrogen is decomposed into nitrate nitrogen. The aerobic zone 12 produced water moves upward with the oxygen in the water. Part of the aerobic zone 12 produced water flows over the guide wall 3 and returns to the anoxic zone 11 for denitrification, and the other part flows over the mud hopper wall 4 and enters the sedimentation zone 13. After sedimentation, the sludge falls back to the anoxic zone 11 and is discharged through the mud discharge pipe 42. The supernatant in the sedimentation zone 13 is discharged through the outlet weir 41. The entire biological fluidized bed tower water treatment system is highly integrated and space-saving: it integrates aerobic decarbonization, anoxic denitrification, and sludge sedimentation in a compact structure with a small footprint, improving treatment efficiency and expanding its scope of application. Clever use of guide plates 5 enables circulation in the aerobic zone 12, further improving oxygen utilization and the system's ability to withstand load shocks. Through ingenious structural design, the sedimentation zone 13 is organically integrated with the biochemical system, forming a three-phase separator-like structure that achieves gas, liquid, and solid phase separation.

[0034] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A biological fluidized bed tower water treatment system, characterized by: The tower body (1) comprises an inner cylinder wall (2), a flow guide wall (3) and a mud bucket wall (4) fixed inside the tower body (1); the bottom of the inner cylinder wall (2) is fixed to the inner wall of the bottom of the tower body (1), the top of the inner cylinder wall (2) is fixedly connected to the bottom of the flow guide wall (3), and there is a distance between the top of the flow guide wall (3) and the inner wall of the top of the tower body (1); the mud bucket wall (4) is located inside the flow guide wall (3), and there is a distance between the outer wall of the mud bucket wall (4) and the inner wall of the flow guide wall (3); the bottom of the mud bucket wall (4) is open and communicates with the inside of the inner cylinder wall (2), and there is a distance between the top of the mud bucket wall (4) and the inner wall of the top of the tower body (1); there is a distance between the inner cylinder wall (2) and the flow guide wall (3) and the vertical inner wall of the tower body (1); The inner area of ​​the inner cylinder wall (2) is an anoxic zone (11), the area between the outer wall of the inner cylinder wall (2) and the inner wall of the tower body (1) is an aerobic zone (12), and the inner area of ​​the mud bucket wall (4) is a sedimentation zone (13); an aeration pipe (8) is provided in the tower body (1), and the aeration pipe (8) is located near the bottom of the tower body (1) and in the aerobic zone (12); The tower body (1) is provided with a water outlet weir (41), a mud discharge pipe (42), a water inlet pipe (6) and a gas lift pipe (7). The water outlet weir (41) is located at the top of the tower body (1) and is connected to the sedimentation zone (13). The water inlet pipe (6) is connected to the anoxic zone (11). The mud discharge pipe (42) is located at the bottom of the tower body (1) and is connected to the bottom of the anoxic zone (11). One end of the gas lift pipe (7) is connected to the interior of the anoxic zone (11), and the other end is connected to the interior of the aerobic zone (12) and is located above the aeration pipe (8).

2. A biological fluidized bed tower water treatment system according to claim 1, characterized in that: A guide plate (5) is fixed in the tower body (1), the guide plate (5) is located in the aerobic zone (12) and above the aeration pipe (8), and the aeration pipe (8) is located between the guide plate (5) and the inner cylinder wall (2).

3. The biological fluidized bed tower water treatment system according to claim 1, characterized in that: The guide wall (3) and the mud hopper wall (4) are both funnel-shaped.

4. A biological fluidized bed tower water treatment system according to claim 3, characterized in that: The top of the mud hopper wall (4) is higher than the top of the guide wall (3).

5. The biological fluidized bed tower water treatment system according to claim 1, characterized in that: The inner wall at the bottom of the inner cylinder wall (2) is centrally concave, and the exhaust pipe is connected to the anoxic zone (11) and is located at the center of the concave bottom of the inner cylinder wall (2).

6. A biological fluidized bed tower water treatment system according to claim 2, characterized in that: The height of the end of the gas lift pipe (7) located in the aerobic zone (12) is higher than the height of the end of the gas lift pipe (7) located in the anoxic zone (11), and the height of the end of the gas lift pipe (7) located in the aerobic zone (12) is lower than the position of the top of the guide plate (5).

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