Gas stripping reflux device and continuous flow aerobic granular sludge treatment tank

Abstract

The utility model relates to a gas stripping backflow device and a continuous flow aerobic granular sludge treatment pond, the gas stripping backflow device comprises a gas conveying pipe, a liquid rising pipe, a liquid outlet pipe, a limiting cylinder, a conical funnel limiting ring and a cover plate, the limiting cylinder is vertically arranged, the large opening end of the conical funnel limiting ring is fixedly connected with the upper end of the limiting cylinder, and the large opening end of the conical funnel limiting ring is fixedly connected with the lower end of the limiting cylinder; the small opening end of the conical funnel limiting ring serves as an observation hole and is located in the limiting cylinder, and the cover plate is hinged to the surface of the upward side of the conical funnel limiting ring. One end of the gas conveying pipe is communicated with the side wall of the riser tube; one end of the liquid rising pipe communicates with one end of the liquid outlet pipe, and the other end of the liquid outlet pipe penetrates through the side wall of the limiting cylinder and is located below the observation hole. The gas stripping reflux device disclosed by the utility model can be used for lifting and refluxing aerobic granular sludge in the low-liquid-level biochemical pool into the high-liquid-level receiving pool, namely lifting sewage containing the aerobic granular sludge from a low position to a high position and refluxing the sewage to a specified area; the device has the characteristics of simple structure, convenience in operation and the like, and is beneficial to keeping complete form and activity of granular sludge.

Description

Technical Field

[0001] The utility model relates to the technical field related to sewage treatment, and in particular to an air stripping reflux device and a continuous flow aerobic granular sludge treatment pool. Background Art

[0002] Continuous-flow aerobic granular sludge technology is a highly effective wastewater treatment method, attracting widespread attention for its advantages such as efficient nitrogen and phosphorus removal, low sludge production, and small footprint. In a continuous-flow aerobic granular sludge system, sludge return is a key step in achieving stable system operation.

[0003] The primary method for sludge return in the biological tanks of existing activated sludge systems is mechanical return. Sludge pumps are typically used to collect and pump the return sludge from the secondary sedimentation tank to the biological tanks, ensuring continuous sludge return and stable system operation. While this traditional mechanical return method can achieve sludge return, it suffers from issues such as high energy consumption, clogging, and excessively high impeller speeds within the pump, which can break up aerobic granular sludge. These issues affect the overall efficiency of the continuous-flow aerobic granular sludge system.

[0004] Therefore, developing a new type of gas stripping reflux device has become an effective way to solve these problems. Utility Model Content

[0005] In order to solve one or more technical problems in the prior art, the utility model provides an air stripping reflux device and a continuous flow aerobic granular sludge treatment tank.

[0006] The technical solution of the utility model for solving the above-mentioned technical problems is as follows: a gas lift reflux device, comprising a delivery pipe, a liquid riser, a liquid outlet pipe, a limiting cylinder, a conical funnel limiting ring and a cover plate, the limiting cylinder is arranged vertically, the large mouth end of the conical funnel limiting ring is fixedly connected to the upper end of the limiting cylinder, the small mouth end of the conical funnel limiting ring is located in the limiting cylinder as an observation hole, and the cover plate is hinged on the upward surface of the conical funnel limiting ring; one end of the delivery pipe is connected to the side wall of the liquid riser; one end of the liquid riser is connected to one end of the liquid outlet pipe, and the other end of the liquid outlet pipe passes through the side wall of the limiting cylinder and is located below the observation hole.

[0007] The beneficial effects of the present invention are as follows: the air lift reflux device of the present invention can be used to lift the aerobic granular sludge in the low-liquid-level biochemical tank and return it to the high-liquid-level receiving tank, that is, to lift the sewage containing the aerobic granular sludge from a low level to a high level and return it to the designated area. It has the characteristics of simple structure, convenient operation, and is conducive to maintaining the complete form and activity of the granular sludge. The structural design of the air lift reflux device is relatively simple, and there are no underwater rotating parts, thereby reducing the complexity and cost of maintenance. At the same time, since there is no complex mechanical structure, the failure rate of the device is also relatively low, which greatly improves the stability and reliability of use; the air lift reflux device can provide appropriate hydraulic shear force when lifting aerobic granular sludge, and will not break the particles, which is conducive to maintaining the morphological structure of the aerobic granular sludge and maintaining good sludge activity; the air lift reflux device has a limiting component that can limit the splashing range of the reflux liquid and improve the reflux efficiency.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, it also includes an air supply device, and the other end of the air supply pipe is connected to the air supply device.

[0010] Furthermore, the air supply device is a blower.

[0011] Furthermore, a valve is provided on the air pipe, and a handle is provided on the outer side of the cover plate.

[0012] The beneficial effect of adopting the above further solution is: by setting a valve, usually a manual valve, with a threaded connection or a flange connection, the air supply can be controlled by controlling the blower frequency and the valve opening, thereby controlling the flow of the aerobic granular sludge return liquid.

[0013] Furthermore, the riser and the liquid outlet pipe are arranged vertically; one end of the riser is connected to one end of the liquid outlet pipe through an elbow joint, and the other end of the liquid outlet pipe is provided with a liquid outlet elbow with an outlet inclined downward.

[0014] The beneficial effect of adopting the above further solution is that by providing a liquid outlet elbow, the reflux liquid can be easily sprayed into the receiving tank, and the outlet end is higher than the receiving tank, which can prevent backflow.

[0015] Furthermore, one end of the delivery pipe located in the riser pipe is bent upward into an arc-shaped structure.

[0016] Furthermore, the limiting cylinder is a rectangular cylinder, the conical funnel limiting ring includes four trapezoidal plates connected in sequence, the cover plate is a rectangular plate, and the peripheral side walls of the cover plate can be adapted to abut against the corresponding trapezoidal plates.

[0017] The beneficial effect of adopting the above further solution is that by providing a rectangular plate, a conical funnel limiting ring with a larger upper portion and a smaller lower portion can be easily formed.

[0018] A continuous flow aerobic granular sludge treatment tank comprises a treatment tank body and an air lift reflux device. The treatment tank body is separated by an isolation wall to form a low liquid level biochemical tank and a high liquid level receiving tank that are not connected to each other. The rising pipe is vertically arranged in the low liquid level biochemical tank, the limiting cylinder is located at the upper end of the high liquid level receiving tank, the liquid outlet pipe passes through the upper part of the isolation wall horizontally, and the air transport pipe passes through the side wall of the low liquid level biochemical tank.

[0019] The beneficial effects of the present invention are as follows: the continuous flow aerobic granular sludge treatment tank of the present invention adopts an air lift reflux device, which uses the lifting force of the gas to push the liquid, and the mass transfer efficiency is also improved, making the entire air lift reflux process more efficient, and greatly reducing energy consumption compared to traditional mechanical pumping methods.

[0020] Furthermore, the riser pipe is fixedly connected to the isolation wall via a first bracket.

[0021] Furthermore, the limiting cylinder is fixedly connected to the isolation wall via a second bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the continuous flow aerobic granular sludge treatment tank of the utility model;

[0023] Figure 2 This is a schematic cross-sectional view of the assembly of the limiting cylinder, the conical funnel limiting ring and the cover plate of the utility model;

[0024] Figure 3 It is a schematic diagram of the top view of the structure of the combination of the limiting cylinder, the conical funnel limiting ring and the cover plate of the utility model.

[0025] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0026] 1. Transport pipe; 2. Lifting pipe; 3. Discharge pipe; 4. Restriction cylinder; 5. Trapezoidal plate; 6. Cover plate; 7. Observation hole; 8. Blower; 9. Valve; 10. First bracket; 11. Second bracket; 12. Handle; 13. Elbow joint; 14. Discharge elbow; 15. Low-level biochemical tank; 16. High-level receiving tank; 17. Isolation wall; 18. Aerobic granular sludge; 19. Hinge; 20. Arc structure. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] like Figures 1 to 3 As shown, a gas lift reflux device of this embodiment includes a delivery pipe 1, a liquid riser 2, a liquid outlet pipe 3, a limiting cylinder 4, a conical funnel limiting ring and a cover plate 6. The limiting cylinder 4 is arranged vertically, and the large end of the conical funnel limiting ring is fixedly connected to the upper end of the limiting cylinder 4. The small end of the conical funnel limiting ring is located in the limiting cylinder 4 as an observation hole 7, and the cover plate 6 is hinged on the upward surface of the conical funnel limiting ring; one end of the delivery pipe 1 is connected to the side wall of the liquid riser 2; one end of the liquid riser 2 is connected to one end of the liquid outlet pipe 3, and the other end of the liquid outlet pipe 3 passes through the side wall of the limiting cylinder 4 and is located below the observation hole 7.

[0029] like Figure 1 As shown, the gas lift reflux device of this embodiment further includes an air supply device, and the other end of the air supply pipe is connected to the air supply device.

[0030] Preferably, the air supply device is a blower 8.

[0031] like Figures 1 to 3 As shown, in this embodiment, the transport pipe 1 is provided with a valve 9, and the outer surface of the cover plate 6 is provided with a handle 12. By providing a valve, typically a manual valve, with a threaded or flanged connection, the air supply can be controlled by controlling the blower frequency and the valve opening, thereby controlling the flow rate of the aerobic granular sludge return liquid.

[0032] like Figure 1 As shown, in this embodiment, the riser pipe 2 and the outlet pipe 3 are arranged vertically. One end of the riser pipe 2 is connected to one end of the outlet pipe 3 via an elbow joint 13. The other end of the outlet pipe 3 is provided with an outlet elbow 14 with an outlet angled downward. The outlet elbow facilitates the discharge of reflux liquid into the receiving tank, and the outlet end is higher than the liquid level in the receiving tank to prevent backflow.

[0033] like Figure 1 As shown, in this embodiment, one end of the delivery pipe 1 located inside the riser pipe 2 is bent upward to form an arc-shaped structure 20 .

[0034] like Figures 1 to 3As shown, the limiting cylinder 4 of this embodiment is a rectangular cylinder, the conical funnel limiting ring includes four trapezoidal plates 5 connected in sequence, the cover plate 6 is a rectangular plate, and the peripheral side walls of the cover plate 6 can be adapted to abut against the corresponding trapezoidal plates 5. By setting the rectangular plate, it is convenient to form a conical funnel limiting ring that is larger at the top and smaller at the bottom. Specifically, the limiting cylinder 4 can be a square cylinder, the cover plate 6 is a square plate, and the cover plate 6 is hinged to the upper surface of one of the trapezoidal plates 5 by a hinge 19. The limiting components cooperate with each other to limit the splashing range of the reflux liquid, and allow the reflux liquid splashed on the plate wall to slide into the receiving device along the plate wall. A square observation hole is left in the middle of the top, and an observation hole cover is installed above the observation hole. It is connected to the trapezoidal plate by a hinge to facilitate opening and closing for observation.

[0035] The air lift reflux device of this embodiment can be used to lift the aerobic granular sludge 18 of the low-liquid-level biochemical tank 15 and return it to the high-liquid-level receiving tank 16, that is, to lift the sewage containing the aerobic granular sludge 18 from a low level to a high level and return it to a designated area. It has the characteristics of simple structure, convenient operation, and is conducive to maintaining the complete form and activity of the granular sludge. The structural design of the air lift reflux device is relatively simple, without underwater rotating parts, thereby reducing the complexity and cost of maintenance. At the same time, due to the lack of a complex mechanical structure, the failure rate of the device is also relatively low, greatly improving the stability and reliability of use; the air lift reflux device can provide appropriate hydraulic shear force when lifting aerobic granular sludge without breaking the particles, which is conducive to maintaining the morphological structure of the aerobic granular sludge and maintaining good sludge activity; the air lift reflux device has a limiting component that can limit the splashing range of the reflux liquid and improve the reflux efficiency.

[0036] like Figure 1 As shown, a continuous flow aerobic granular sludge treatment tank of this embodiment includes a treatment tank body and the above-mentioned gas lift reflux device. The treatment tank body is separated by a partition wall to form a low liquid level biochemical tank 15 and a high liquid level receiving tank 16 that are not connected to each other. The rising pipe 2 is vertically arranged in the low liquid level biochemical tank 15, the limiting cylinder 4 is located at the upper end of the high liquid level receiving tank 16, the liquid outlet pipe 3 passes through the upper part of the partition wall 17 horizontally, and the air transport pipe 1 passes through the side wall of the low liquid level biochemical tank 15.

[0037] like Figure 1 As shown, the riser pipe 2 of this embodiment is fixedly connected to the isolation wall 17 via a first bracket 10. Two first brackets 10 can be used to make the fixation of the riser pipe 2 more stable.

[0038] like Figure 1 As shown, the limiting cylinder 4 of this embodiment is fixedly connected to the isolation wall 17 via the second bracket 11 .

[0039] The first bracket 10 can be a connector with a clamp, one end of which clamps the riser tube 2 and the other end can be fixed to the isolation wall by bolts. The second bracket 11 can be an angle steel with connecting pieces, etc., and the connecting pieces at both ends of the angle steel can be fixed to the confinement cylinder 4 and the isolation wall 17 by bolts.

[0040] The riser pipe and the upper end limiting assembly are fixed to the isolation wall with a bracket to prevent shaking or displacement due to the impact of air flow or liquid flow during the gas lift process.

[0041] In a continuous-flow aerobic granular sludge system, sludge return is a critical step in achieving stable system operation. If a conventional sludge pump is used for aerobic granular sludge return, the high-speed rotation of the mechanical impeller within the pump will cause the aerobic granular sludge in the system to be cut and broken, hindering the aerobic granular sludge from maintaining a good shape and treatment effect. Airlift return utilizes a gas pipe to supply air to the riser, taking advantage of the interaction and density difference between the gas and liquid to return the sludge, thus resolving the problem of the high-speed rotation of the mechanical impeller of the conventional sludge return pump breaking up the aerobic granular sludge. At the same time, a restriction assembly and observation port are provided at the airlift return outlet to prevent splashing of the return liquid. Conventional sludge return methods often rely on complex mechanical transmission components, which are not only costly to maintain but also prone to failure. The airlift device, on the other hand, has a relatively simple structure and lacks complex mechanical components, resulting in lower maintenance costs and a corresponding reduction in failure rates.

[0042] The principle of the air lift reflux device used in the continuous flow aerobic granular sludge treatment tank of this embodiment is based on the interaction and density difference between gas and liquid. By inputting pressurized air into the bottom of the riser, the air forms a gas-liquid mixture inside the riser. Since the density of gas is much smaller than that of liquid, the overall density of the gas-liquid mixture will be smaller than the mixed liquid outside the tube. According to Archimedes' principle (buoyancy principle), this density difference will cause the gas-liquid mixture to rise in the riser. The blower supplies air, which is introduced into the riser through the air pipe, generating bubbles and fully mixing with the aerobic granular sludge mixed liquid. When the bubbles rise in the liquid, due to the buoyancy effect, they will drive the reflux liquid to rise together. By controlling the flow rate of the gas, the flow rate of the gas in the pipeline can be changed, generating forces of different sizes, thereby controlling the flow rate of the reflux liquid. The riser can be set in one or more groups according to the flow rate and reflux amount of the reflux sludge to ensure that the aerobic granular sludge can be stably and efficiently refluxed to the front end of the reaction tank. The outlet of the liquid pipe is equipped with a liquid elbow to guide the aerobic granular sludge return liquid downward to prevent splashing. A restriction assembly is installed at the upper end of the liquid pipe outlet to limit the splash range of the return liquid, ensuring that the return liquid can flow out of the liquid pipe stably and orderly, avoiding splashing, thereby maintaining the stability and efficiency of the entire gas lift reflux process.

[0043] The continuous flow aerobic granular sludge treatment tank of this embodiment adopts an air lift reflux device. By utilizing the lifting force of the gas to push the liquid, the mass transfer efficiency is also improved, making the entire air lift reflux process more efficient. Compared with the traditional mechanical pumping method, energy consumption is greatly reduced.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A gas stripping reflux device, characterized in that: It includes a delivery pipe, a liquid rising pipe, a liquid outlet pipe, a limiting cylinder, a conical funnel limiting ring and a cover plate, the limiting cylinder is arranged vertically, the large mouth end of the conical funnel limiting ring is fixedly connected to the upper end of the limiting cylinder, the small mouth end of the conical funnel limiting ring is located in the limiting cylinder as an observation hole, and the cover plate is hinged on the upward surface of the conical funnel limiting ring; one end of the delivery pipe is connected to the side wall of the liquid rising pipe; one end of the liquid rising pipe is connected to one end of the liquid outlet pipe, and the other end of the liquid outlet pipe passes through the side wall of the limiting cylinder and is located below the observation hole.

2. A gas stripping reflux device according to claim 1, characterized in that: It also includes an air supply device, and the other end of the air supply tube is connected to the air supply device.

3. A gas stripping reflux device according to claim 2, characterized in that: The air supply device is a blower.

4. A gas stripping reflux device according to claim 1, characterized in that: The air pipe is provided with a valve, and the outer side surface of the cover plate is provided with a handle.

5. A gas stripping reflux device according to claim 1, characterized in that: The liquid riser and the liquid outlet pipe are arranged vertically; one end of the liquid riser is connected with one end of the liquid outlet pipe through a bend joint, and the other end of the liquid outlet pipe is provided with a liquid outlet bend with an outlet inclined downward.

6. A gas stripping reflux device according to claim 1, characterized in that: One end of the transport pipe located in the riser pipe is bent upward into an arc structure.

7. A gas stripping reflux device according to claim 1, characterized in that: The limiting cylinder is a rectangular cylinder, the conical funnel limiting ring includes four trapezoidal plates connected in sequence, the cover plate is a rectangular plate, and the peripheral side wall of the cover plate can be adapted to abut against the corresponding trapezoidal plate.

8. A continuous flow aerobic granular sludge treatment tank, characterized in that: It comprises a treatment tank body and a gas lift reflux device as claimed in any one of claims 1 to 7, wherein the treatment tank body is separated by a partition wall to form a low liquid level biochemical tank and a high liquid level receiving tank which are not connected to each other, the riser is vertically arranged in the low liquid level biochemical tank, the limiting cylinder is located at the upper end of the high liquid level receiving tank, the outlet pipe penetrates the upper part of the partition wall horizontally, and the air transport pipe penetrates the side wall of the low liquid level biochemical tank.

9. A continuous flow aerobic granular sludge treatment tank according to claim 8, characterized in that: The liquid riser is fixedly connected to the isolation wall via a first bracket.

10. The continuous flow aerobic granular sludge treatment tank according to claim 8, characterized in that: The limiting cylinder is fixedly connected to the isolation wall via a second bracket.

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