Optimized internal sewage short flow biological fluidized bed tower reactor

Abstract

The application relates to the technical field of sewage treatment, in particular to an optimized internal sewage short-flow biological fluidized bed tower reactor, which comprises a tower body, an inner cylinder coaxially arranged in the tower body, a flow guide plate coaxially arranged between the tower body and the inner cylinder, and a water inlet pipe penetrating the tower body and the inner cylinder, the lower end of the inner cylinder is fixedly connected with the inner wall of the lower end of the tower body, the flow guide plate is a cylinder, the flow guide plate is spaced apart from the inner wall of the tower body and the inner wall of the inner cylinder, a gas lifting pipe is coaxially arranged in the inner cylinder, a communicating pipe is connected to the upper end of the gas lifting pipe, the communicating pipe communicates the inside and outside of the inner cylinder, the end of the communicating pipe away from the gas lifting pipe penetrates the flow guide plate and is located on the side of the flow guide plate away from the inner cylinder, a flow divider is coaxially arranged on the upper end of the outer peripheral wall of the flow guide plate, the lower end of the inner wall of the flow divider is fixedly connected with the outer peripheral wall of the flow guide plate, the upper end of the flow divider is flush with the upper end of the flow guide plate, and the end of the communicating pipe away from the gas lifting pipe is located between the flow divider and the flow guide plate, so that the short-flow risk is reduced.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a biological fluidized bed tower reactor for optimizing internal wastewater short-circuiting. Background Technology

[0002] In recent years, with the increasing frequency of extreme environmental events, environmental protection has become an issue we must confront. Wastewater discharge from my country's petrochemical industry accounts for more than 20% of the country's total industrial wastewater. This wastewater is characterized by its large volume, high concentration, and complex composition of pollutants, making it extremely difficult to treat.

[0003] Existing wastewater treatment typically involves biological fluidized bed technology, which is a highly efficient biological treatment technology. The core of this technology is to allow microorganisms to be in a "fluidized state" under the action of wastewater flow or airflow, thereby enhancing the contact between microorganisms and pollutants and oxygen, and thus efficiently degrading organic matter in the water.

[0004] The existing technical solutions mentioned above have the following drawbacks: when stripped wastewater from the anoxic zone enters the aerobic upflow zone, a portion of the wastewater in the upflow zone will flow directly upwards into the sedimentation tank and be discharged directly, which may result in the risk of substandard effluent. Utility Model Content

[0005] In order to reduce the risk of short-circuiting, this application provides a biological fluidized bed tower reactor that optimizes internal sewage short-circuiting.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: A biological fluidized bed tower reactor for optimizing internal sewage short-flow includes a tower body, an inner cylinder coaxially disposed within the tower body, a guide plate coaxially disposed between the tower body and the inner cylinder, and an inlet pipe passing through the tower body and the inner cylinder. The lower end of the inner cylinder is fixedly connected to the inner wall of the lower end of the tower body. The guide plate is cylindrical and is spaced apart from both the inner cylinder and the inner wall of the tower body. A gas riser is coaxially disposed within the inner cylinder, and a connecting pipe is connected to the upper end of the gas riser. The connecting pipe connects the inside and outside of the inner cylinder. The end of the connecting pipe away from the gas riser passes through the guide plate and is located on the side of the guide plate away from the inner cylinder. A distributor is coaxially disposed on the upper end of the outer peripheral wall of the guide plate. The lower end of the inner wall of the distributor is fixedly connected to the outer peripheral wall of the guide plate, and the upper end of the distributor is flush with the upper end of the guide plate. The end of the connecting pipe away from the gas riser is located between the distributor and the guide plate.

[0007] By adopting the above technical solution, and by setting up a tower body, inner cylinder, baffle plate, inlet pipe, gas riser pipe, connecting pipe, and distributor, the inside of the inner cylinder is an anoxic zone, and the area between the inner cylinder and the tower body is an aerobic zone. The inlet pipe sends sewage into the anoxic zone for preliminary treatment, and the gas riser pipe, in conjunction with the connecting pipe, sends sewage from the anoxic zone into the aerobic zone. The baffle plate guides the water flow circulation in the aerobic zone, and the distributor can guide the sewage discharged from the connecting pipe to circulate preferentially in the aerobic zone, reducing the short-circuiting situation where sewage directly enters the sedimentation zone, while enhancing the contact between sewage, microorganisms, and oxygen, thereby improving sewage treatment efficiency.

[0008] Optionally, a guide tube and a mud hopper are coaxially arranged at the upper end of the inner cylinder. The lower end of the guide tube is contracted, and the inner diameter of the lower end of the guide tube is smaller than the inner diameter of the inner cylinder. The lower end of the outer peripheral wall of the guide tube is fixed to the upper end of the inner cylinder. The inner diameter of the upper end of the guide tube is larger than the inner diameter of the inner cylinder. The upper end of the guide tube is spaced apart from the inner wall of the upper end of the tower body. The mud hopper is coaxially arranged with the guide tube. The lower end of the mud hopper is contracted, and the contraction amplitude is the same as that of the guide tube. The mud hopper and the guide tube are spaced apart, and the upper end of the mud hopper is closer to the upper end of the tower body than the upper end of the guide tube.

[0009] By adopting the above technical solution, and by setting up a guide tube and a sludge hopper, the guide tube can guide the partially treated wastewater in the aerobic zone to flow back to the anoxic zone for denitrification. The inside of the sludge hopper is a sedimentation zone, and its lower constriction structure facilitates the sludge to fall back to the anoxic zone after settling. The higher setting at the top can prevent the supernatant in the sedimentation zone from flowing back, ensuring that the supernatant flows stably to the effluent weir, and realizing the orderly connection between anoxic, aerobic and sedimentation.

[0010] Optionally, the upper end of the splitter is flush with the upper end of the guide plate.

[0011] By adopting the above technical solution, and by setting the upper end of the diverter to be flush with the upper end of the guide plate, the diverter and the guide plate can form a continuous flow guiding structure. This allows the sewage discharged from the connecting pipe to enter the lower part of the aerobic zone more smoothly under the guidance of the diverter and participate in the circulation. This avoids water flow turbulence caused by the inconsistent height of the diverter and the guide plate, further enhances the water flow circulation effect in the aerobic zone, and increases the retention time of sewage in the aerobic zone.

[0012] Optionally, the height of the end of the connecting pipe located between the distributor and the guide plate is higher than the height of the end of the connecting pipe located inside the inner cylinder.

[0013] By adopting the above technical solution, and by setting the end of the connecting pipe located between the distributor and the guide plate to be higher than the end located inside the inner cylinder, the height difference combined with the gas boost can be used to allow the sewage in the anoxic zone to flow more smoothly into the aerobic zone. At the same time, it ensures that the sewage can flow downwards to participate in the circulation after entering the aerobic zone, rather than directly upwards, thus extending the treatment path of the sewage in the aerobic zone and enhancing the contact degradation effect of organic pollutants with microorganisms and oxygen.

[0014] Optionally, a first aeration pipe in an annular shape is coaxially arranged between the inner cylinder and the tower body. The first aeration pipe is located below the guide plate and is spaced apart from the guide plate, the outer peripheral wall of the inner cylinder, and the inner wall of the tower body.

[0015] By adopting the above technical solution and setting up the first aeration pipe, oxygen can be provided to the aerobic zone to meet the needs of microbial degradation. At the same time, the airflow promotes the sewage in the aerobic zone to form a circulating flow around the guide plate. The intermittent setting avoids obstructing the water flow, improves the oxygen utilization rate and the mixing efficiency of sewage and microorganisms, and enhances the pollutant degradation capacity of the aerobic zone.

[0016] Optionally, the mud hopper is provided with an inclined tube, which is a disc-shaped structure composed of multiple plastic inclined tubes with honeycomb hexagonal cross-sections.

[0017] By adopting the above technical solution and setting up inclined tubes, the settling area of ​​the sedimentation zone can be increased, the settling distance of suspended particles can be shortened, and the water flow can be in a laminar state in the inclined tubes, making it easier for suspended particles to settle onto the tube wall, thereby improving the sludge separation effect in the sedimentation zone, reducing the suspended particles carried by the effluent, and improving the effluent clarity.

[0018] Optionally, a second aeration pipe is provided below the inclined tube, the second aeration pipe being spaced apart from the inclined tube, and the air outlet of the second aeration pipe facing the inclined tube.

[0019] By adopting the above technical solution and setting up a second aeration pipe, the sedimentation particles attached to the inner wall of the inclined tube can be cleaned periodically by airflow, preventing the inclined tube from being blocked by particle accumulation, maintaining the efficient sedimentation function of the inclined tube, avoiding blockage that affects the treatment efficiency of the sedimentation zone, and ensuring the long-term stable operation of the sedimentation zone.

[0020] Optionally, the lower end of the inner cylinder is provided with a conical contraction opening, the lower end of which is fixedly connected to the inner wall of the lower end of the tower body. The lower end of the tower body is provided with a mud discharge pipe, which connects the inside and outside of the tower body with the inner cylinder.

[0021] By adopting the above technical solution, and by setting up a contraction port and a sludge discharge pipe, the sludge that falls from the sedimentation zone to the anoxic zone can be guided by the conical contraction port to concentrate at the center of the bottom of the inner cylinder, and then smoothly discharged through the sludge discharge pipe, avoiding the accumulation of sludge at the bottom of the inner cylinder, ensuring the stability of the internal environment of the anoxic zone, and not affecting the preliminary treatment effect of sewage.

[0022] Optionally, the upper inner wall of the tower body is provided with a water outlet weir that communicates with the outside, and the water outlet weir is coaxially arranged with the tower body.

[0023] By adopting the above technical solution and setting up an outlet weir, the supernatant after clarification in the sedimentation zone can be discharged from the tower body evenly and stably, thereby improving the effluent compliance rate.

[0024] In summary, this application has the following technical effects: 1. By setting up a tower body, inner cylinder, baffle plate, inlet pipe, gas riser pipe, connecting pipe and distributor, the inner cylinder is an anoxic zone and the area between the inner cylinder and the tower body is an aerobic zone. The inlet pipe sends the sewage into the anoxic zone for preliminary treatment. The gas riser pipe, together with the connecting pipe, sends the sewage from the anoxic zone into the aerobic zone. The baffle plate guides the water flow circulation in the aerobic zone. The distributor can guide the sewage discharged from the connecting pipe to circulate preferentially in the aerobic zone, reducing the short-circuiting situation where sewage directly enters the sedimentation zone. At the same time, it enhances the contact between sewage, microorganisms and oxygen, and improves sewage treatment efficiency. 2. By setting up inclined tubes, the settling area of ​​the sedimentation zone can be increased, the settling distance of suspended particles can be shortened, and the water flow in the inclined tubes can be in a laminar state, making it easier for suspended particles to settle onto the tube wall, improving the sludge separation effect in the sedimentation zone, reducing the suspended particles carried by the effluent, and improving the clarity of the effluent. 3. By installing a second aeration pipe, the settled particles attached to the inner wall of the inclined tube can be cleaned periodically by airflow, preventing the inclined tube from being blocked by particle accumulation, maintaining the efficient sedimentation function of the inclined tube, avoiding blockage that affects the treatment efficiency of the sedimentation zone, and ensuring the long-term stable operation of the sedimentation zone. Attached Figure Description

[0025] Figure 1 This is a structural diagram of this application.

[0026] Explanation of reference numerals in the attached diagram: 1. Tower body; 11. Inlet pipe; 12. Aerobic zone; 13. Sludge outlet pipe; 2. Inner cylinder; 21. Anoxic zone; 22. Gas riser pipe; 23. Connecting pipe; 3. Flow guide cylinder; 4. Sludge hopper; 41. Sedimentation zone; 42. Outlet weir; 5. Flow guide plate; 6. First aeration pipe; 7. Diverter; 8. Inclined pipe; 9. Second aeration pipe. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] This application discloses a biological fluidized bed tower reactor for optimizing internal wastewater short-flow, with reference to... Figure 1 The system includes a vertically arranged tower body 1, an inner cylinder 2 located inside the tower body 1, a guide cylinder 3 located at the top of the inner cylinder 2, and a mud hopper 4 located inside the guide cylinder 3. The tower body 1 is a cylindrical structure closed at both ends and is placed vertically. The inner cylinder 2 is a cylindrical structure coaxial with the tower body 1. The lower end of the inner cylinder 2 is fixedly connected to the lower inner wall of the tower body 1. The lower end of the inner cylinder 2 has a conical contraction opening, the lower end of which is fixedly connected to the lower inner wall of the tower body 1. The upper end of the inner cylinder 2 is spaced apart from the upper inner wall of the tower body 1.

[0029] Reference Figure 1The guide tube 3 is a cylinder, coaxially arranged with the tower body 1. The lower end of the guide tube 3 is tapered, and the inner diameter of the lower end of the guide tube 3 is smaller than the inner diameter of the inner cylinder 2. The lower end of the outer peripheral wall of the guide tube 3 is fixed to the upper end of the inner cylinder 2, and the inner diameter of the upper end of the guide tube 3 is larger than the inner diameter of the inner cylinder 2. The upper end of the guide tube 3 is spaced apart from the inner wall of the upper end of the tower body 1. The mud hopper 4 is coaxially arranged with the guide tube 3. The lower end of the mud hopper 4 is tapered, and the tapering amplitude is the same as that of the guide tube 3. The mud hopper 4 is spaced apart from the guide tube 3. The upper end of the mud hopper 4 is closer to the upper end of the tower body 1 than the upper end of the guide tube 3. The upper end of the outer peripheral wall of the mud hopper 4 is connected to the inner wall of the tower body 1 through a horizontal connecting rod (not shown in the figure).

[0030] Reference Figure 1 A guide plate 5 is coaxially arranged between the inner cylinder 2 and the tower body 1. The guide plate 5 is cylindrical, and its outer peripheral wall is fixed to the inner wall of the tower body 1 by a connecting rod. The length of the guide plate 5 is less than the length of the inner cylinder 2, and the lower end of the guide plate 5 is spaced apart from the lower inner wall of the tower body 1. The area inside the inner cylinder 2 is the anoxic zone 21, the area between the inner cylinder 2 and the tower body 1 is the aerobic zone 12, and the area inside the sludge hopper 4 is the sedimentation zone 41. A water inlet pipe 11 is provided through the walls of the tower body 1 and the inner cylinder 2. The length direction of the water inlet pipe 11 is perpendicular to the axis of the tower body 1. The water inlet pipe 11 connects to the outside and the anoxic zone 21, and sends the treated wastewater into the inner cylinder 2 for the first step of treatment. The water inlet pipe 11 is located above the guide plate 5 and spaced apart from it.

[0031] Reference Figure 1 A gas riser pipe 22 is coaxially arranged inside the inner cylinder 2. The gas riser pipe 22 is connected to the aerobic zone 12 through a connecting pipe. One end of the connecting pipe is connected to the upper end of the gas riser pipe 22, and the other end passes through the guide plate 5 and is located on the side of the guide plate 5 away from the inner cylinder 2. The height of the end of the connecting pipe 23 in the aerobic zone 12 is higher than the height of the end of the gas riser pipe 22 in the anoxic zone 21, and the height of the end of the gas riser pipe 22 in the aerobic zone 12 is lower than the height of the top of the guide plate 5.

[0032] Reference Figure 1 A first aeration pipe 6 is coaxially arranged between the inner cylinder 2 and the tower body 1 in an annular shape. The first aeration pipe 6 is located below the guide plate 5 and is spaced apart from the guide plate 5, the outer peripheral wall of the inner cylinder 2, and the inner wall of the tower body 1. The air outlet of the first aeration pipe 6 is upward. After the sewage undergoes the first treatment in the inner cylinder 2, it is lifted into the aerobic zone 12 by the gas lift pipe 22. It then circulates around the guide plate 5 through the action of the first aeration pipe 6, thereby undergoing the second treatment.

[0033] Reference Figure 1A diverter 7 is coaxially mounted on the outer wall of the guide plate 5. The diverter 7 is annular in shape, with its flared opening facing away from the aeration pipe. The lower end of the inner wall of the diverter 7 is fixed to the outer peripheral wall of the guide plate 5, and the upper end of the diverter 7 is flush with the upper end of the guide plate 5. The end of the connecting pipe 23 away from the gas riser pipe 22 is located between the diverter 7 and the guide plate 5 to reduce short-circuiting. A water outlet weir 42 communicating with the outside is provided on the inner wall of the upper end of the tower body 1. The water outlet weir 42 is coaxially mounted with the tower body 1. The mud hopper 4 is equipped with an inclined tube 8. The inclined tube 8 is a disc-shaped structure composed of multiple plastic inclined tubes 8 with honeycomb hexagonal cross sections. The inclined tube 8 is horizontal and coaxial with the mud hopper 4. The inclined tube 8 can increase the settling area and shorten the settling distance. The water to be treated enters from the upper part of the inclined tube 8. Inside the inclined tube 8, the water flow becomes laminar. Under the action of gravity, the suspended particles in the water settle downwards to the lower tube wall at a speed much greater than the upward velocity of the water flow.

[0034] Reference Figure 1 A second aeration pipe 9 is installed in the settling zone below the inclined tube 8. The second aeration pipe 9 is connected to the inner wall of the mud hopper 4 via a connecting rod. The second aeration pipe 9 is spaced apart from the inclined tube 8, and its outlet faces the inclined tube 8. During long-term settling, particles will adhere to the inner wall of the inclined tube 8, and the second aeration pipe 9 will be cleaned periodically. A mud discharge pipe 13 is installed at the lower end of the tower body 1, which connects the anoxic zone 21 to the outside.

[0035] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A biological fluidized bed tower reactor for optimizing internal wastewater short-circuiting, characterized in that: The system includes a tower body (1), an inner cylinder (2) coaxially arranged inside the tower body (1), a guide plate (5) coaxially arranged between the tower body (1) and the inner cylinder (2), and a water inlet pipe (11) passing through the tower body (1) and the inner cylinder (2). The lower end of the inner cylinder (2) is fixedly connected to the lower end inner wall of the tower body (1). The guide plate (5) is a cylinder, and the guide plate (5) is spaced apart from the inner cylinder (2) and the inner wall of the tower body (1). A gas lift pipe (22) is coaxially arranged inside the inner cylinder (2), and the upper end of the gas lift pipe (22) is connected to a connecting pipe. The connecting pipe (23) connects the inside and outside of the inner cylinder (2). The end of the connecting pipe (23) away from the gas riser pipe (22) passes through the guide plate (5) and is located on the side of the guide plate (5) away from the inner cylinder (2). A diverter (7) is coaxially provided on the upper end of the outer peripheral wall of the guide plate (5). The lower end of the inner wall of the diverter (7) is fixed to the outer peripheral wall of the guide plate (5). The upper end of the diverter (7) is flush with the upper end of the guide plate (5). The end of the connecting pipe (23) away from the gas riser pipe (22) is located between the diverter (7) and the guide plate (5).

2. The biological fluidized bed tower reactor for optimizing internal wastewater short-circuiting according to claim 1, characterized in that: The upper end of the inner cylinder (2) is coaxially provided with a guide cylinder (3) and a mud hopper (4). The lower end of the guide cylinder (3) is contracted. The inner diameter of the lower end of the guide cylinder (3) is smaller than the inner diameter of the inner cylinder (2). The lower end of the outer peripheral wall of the guide cylinder (3) is fixed to the upper end of the inner cylinder (2). The inner diameter of the upper end of the guide cylinder (3) is larger than the inner diameter of the inner cylinder (2). The upper end of the guide cylinder (3) is spaced apart from the inner wall of the upper end of the tower body (1). The mud hopper (4) is coaxially provided with the guide cylinder (3). The lower end of the mud hopper (4) is contracted, and the contraction amplitude is the same as that of the guide cylinder (3). The mud hopper (4) is spaced apart from the guide cylinder (3). The upper end of the mud hopper (4) is closer to the upper end of the tower body (1) than the upper end of the guide cylinder (3).

3. A biological fluidized bed tower reactor for optimizing internal wastewater short-circuiting according to claim 1, characterized in that: The upper end of the splitter (7) is flush with the upper end of the guide plate (5).

4. A biological fluidized bed tower reactor for optimizing internal wastewater short-circuiting according to claim 3, characterized in that: The height of the end of the connecting pipe (23) located between the distributor (7) and the guide plate (5) is higher than the height of the end of the connecting pipe (23) located inside the inner cylinder (2).

5. A biological fluidized bed tower reactor for optimizing internal wastewater short-circuiting according to claim 4, characterized in that: A first aeration pipe (6) in an annular shape is coaxially arranged between the inner cylinder (2) and the tower body (1). The first aeration pipe (6) is located below the guide plate (5) and is spaced apart from the guide plate (5), the outer peripheral wall of the inner cylinder (2) and the inner wall of the tower body (1).

6. A biological fluidized bed tower reactor for optimizing internal wastewater short-circuiting according to claim 2, characterized in that: The mud hopper (4) is provided with an inclined tube (8), which is a disc-shaped structure composed of multiple plastic inclined tubes (8) with honeycomb hexagonal cross sections.

7. A biological fluidized bed tower reactor for optimizing internal wastewater short-flow according to claim 6, characterized in that: A second aeration pipe (9) is provided below the inclined pipe (8). The second aeration pipe (9) is spaced apart from the inclined pipe (8), and the air outlet of the second aeration pipe (9) faces the inclined pipe (8).

8. A biological fluidized bed tower reactor for optimizing internal wastewater short-circuiting according to claim 1, characterized in that: The lower end of the inner cylinder (2) is provided with a conical contraction opening. The lower end of the contraction opening is fixed to the inner wall of the lower end of the tower body (1). The lower end of the tower body (1) is provided with a mud discharge pipe (13), which connects the inside and outside of the tower body (1) with the inside of the inner cylinder (2).

9. A biological fluidized bed tower reactor for optimizing internal wastewater short-circuiting according to claim 7, characterized in that: The upper inner wall of the tower body (1) is provided with a water outlet weir (42) that communicates with the outside. The water outlet weir (42) is coaxially arranged with the tower body (1).

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