A horizontal flow secondary sedimentation tank bottom sludge flushing device

Abstract

This utility model discloses a flushing device for bottom sludge in a horizontal flow secondary sedimentation tank, solving the problems of low efficiency, high losses, and safety hazards caused by the need for emptying and cleaning after sludge discharge pipe blockage. The device includes a sludge blowing pipe inside the sludge discharge pipe, and a backflush pipe on the pump suction pipe connected to the sludge blowing pipe via a connecting pipe. Backflush channels are provided at the top and sides of the sludge blowing pipe, connected to an external high-pressure fluid delivery device. The top blowing pipe is arranged directly below the sludge discharge hole and equidistant axially, with a smaller diameter at the top and a larger diameter at the bottom. The side blowing ports are inclined. The sludge blowing pipe is fixed to the bottom of the sludge discharge pipe by a pad. This device uses high-pressure air, supernatant, or clean water for backflush, removing more than 90% of the sludge in 10 minutes, eliminating the need for emptying and saving water, eliminating safety hazards, and increasing the unblocking efficiency by 3 times. It is suitable for the maintenance of sludge discharge pipes in secondary sedimentation tanks of sewage treatment plants.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a device for flushing sludge at the bottom of a horizontal flow secondary sedimentation tank. Background Technology

[0002] In the field of wastewater treatment, horizontal flow secondary sedimentation tanks are typically characterized by their small footprint and compact structure. Their main function is sludge-water separation; the supernatant proceeds to the next stage for further treatment or is discharged directly after meeting standards, while the bottom sludge enters the sludge pumping station through a sludge discharge pipe. Horizontal flow secondary sedimentation tanks are widely used in various wastewater treatment plants. However, due to their inherent structural limitations, sludge and other debris can easily accumulate and clog the sludge discharge pipe, causing persistent sludge discharge problems and affecting the normal operation of the secondary sedimentation tank. Periodically, the secondary sedimentation tank needs to be emptied and cleaned, and the sludge discharge pipe needs to be dredged, which is extremely time-consuming, labor-intensive, poses safety hazards, and results in significant water waste. Summary of the Invention

[0003] The technical problem to be solved by this utility model is that the mud discharge pipe needs to be emptied and cleaned after it becomes blocked. The maintenance process results in significant losses, low efficiency, and safety hazards.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a horizontal flow secondary sedimentation tank bottom sludge flushing device, including a sludge blowing pipe arranged in parallel inside the sludge discharge pipe, a backflush pipe connected to the pump suction pipe connected to the output end of the sludge discharge pipe, the backflush pipe being connected to the sludge blowing pipe through a connecting pipe inside the pump suction pipe, backflush channels being provided at the top and sides of the sludge blowing pipe respectively, and an external high-pressure fluid conveying device being connected to the input end of the backflush pipe.

[0005] Preferably, the top of the mud blowing pipe is connected to a top blowing pipe, which is arranged directly below the mud discharge hole at the top of the mud discharge pipe, and side blowing ports are arranged on both sides of the top of the mud blowing pipe.

[0006] Preferably, the top blowing pipes are arranged at equal intervals along the axial direction of the sludge discharge pipe.

[0007] Preferably, the diameter of the internal channel of the top blowing pipe decreases from bottom to top.

[0008] Preferably, the side blowing port is inclined, and the orifice located inside the mud blowing pipe is higher than the orifice on the outside.

[0009] Preferably, the mud blowing pipe is located at the inner bottom of the mud discharge pipe, and a pad is fixedly connected to the inner bottom of the mud discharge pipe. The top of the pad is provided with an arc-shaped groove for accommodating the mud blowing pipe.

[0010] Preferably, the top two sides of the pad are provided with arc-shaped flow guiding structures, the flow guiding structures are connected to the inner wall of the sludge discharge pipe, and the side blowing port is arranged facing the flow guiding structure.

[0011] Preferably, the bottom of the mud blowing pipe is fixedly connected with a bolt, which passes through the pad and the mud discharge pipe, and a locking nut is threaded onto the bolt section outside the mud discharge pipe.

[0012] Preferably, the sludge discharge pipe is arranged in the sludge discharge trough at the bottom of the secondary sedimentation tank, and a sludge scraping device is rotatably arranged above the sludge discharge trough.

[0013] Preferably, the external high-pressure fluid conveying device conveys high-pressure gas, upper clear liquid, or clean water.

[0014] This utility model provides a horizontal flow secondary sedimentation tank bottom sludge flushing device, which has the following beneficial effects.

[0015] 1. Utilizing external high-pressure fluid (air pressure ≥ 0.6 MPa or water pressure ≥ 0.8 MPa) through the backflush pipe and connecting pipe to the sludge discharge pipe, the top blow pipe sprays directly at the sludge discharge hole (flow velocity ≥ 30 m / s), while the side blow nozzles spray at an angle, forming a three-dimensional scouring flow field. This can remove over 90% of the sludge accumulated in the sludge discharge pipe within 10 minutes. Compared to traditional emptying and cleaning methods, an average of 6 maintenance sessions per tank per year can save approximately 12,000 tons of water and avoid a 15% loss of daily treatment capacity at the wastewater treatment plant.

[0016] 2. The backflushing process does not require personnel to enter the secondary sedimentation tank, eliminating the risks of oxygen deficiency and hydrogen sulfide poisoning in confined space operations. The number of maintenance personnel is reduced from the traditional 4 to 2, reducing labor intensity by 50%, while avoiding safety hazards such as tank wall collapse during venting.

[0017] 3. The diameter of the top blowing pipe is smaller at the top and larger at the bottom (e.g., inlet φ20mm → outlet φ15mm) to create a Venturi effect and enhance the jet impact force; the inner hole of the side blowing port is higher than the outer hole (height difference 5-10mm), so that the backflushing fluid has both horizontal shearing and upward lifting force. Combined with the flow guiding structure on both sides of the pad (curvature radius 50-80mm), the sludge particles are guided to the center of the sludge discharge pipe to prevent secondary siltation. The cleaning efficiency is 3 times higher than that of traditional single-point flushing. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a top view of the secondary sedimentation tank in an embodiment of this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of the secondary sedimentation tank in an embodiment of this utility model.

[0021] Figure 3 This is a schematic diagram of the sludge discharge pipe in an embodiment of this utility model.

[0022] Figure 4 This is a schematic diagram of the end face structure of the sludge discharge pipe in an embodiment of this utility model.

[0023] In the diagram: 1. Secondary sedimentation tank; 2. Sludge discharge trough; 3. Sludge discharge pipe; 4. Sludge discharge hole; 5. Sludge outlet trough; 6. Water outlet trough; 7. Pump suction pipe; 8. Sludge discharge pump; 9. Backflush pipe; 10. Sludge blowing pipe; 11. Connecting pipe; 12. Gasket; 13. Bolt; 14. Nut; 15. Top blowing pipe; 16. Side blowing port. Detailed Implementation

[0024] like Figure 1-4 As shown, this utility model provides a horizontal flow secondary sedimentation tank bottom sludge flushing device, including a sludge blowing pipe 10 arranged in parallel inside the sludge discharge pipe 3, a backflush pipe 9 connected to the pump suction pipe 7 connected to the output end of the sludge discharge pipe 3, the backflush pipe 9 being connected to the sludge blowing pipe 10 through the connecting pipe inside the pump suction pipe 7, backflush channels being provided on the top and both sides of the sludge blowing pipe 10, and the input end of the backflush pipe 9 being connected to an external high-pressure fluid conveying device.

[0025] Sludge discharge troughs 5 and water discharge troughs 6 are arranged on both sides of the secondary sedimentation tank 1. A pump suction pipe 7 is installed in the sludge discharge trough 5, and a sludge discharge pump 8 is connected to the pump suction pipe 7. The pump suction pipe 7 is connected to the sludge discharge pipe 3 at the bottom of the secondary sedimentation tank 1. The sludge from the sludge discharge pipe 3 and the bottom of the secondary sedimentation tank 1 is pumped into the pump suction pipe 7 by the sludge discharge pump 8 and discharged into the sludge discharge trough 5. When low sludge discharge efficiency or blockage of the sludge discharge pipe 3 is found, high-pressure fluid is supplied through a high-pressure fluid conveying device. The high-pressure fluid is input through the backflush pipe 9 and enters the connecting pipe 11. The backflush pipe 9 backflushes the inside of the sludge discharge pipe 10, cleaning the sludge inside the sludge discharge pipe 3 and the sludge discharge hole 4 at the top of the sludge discharge pipe 3, eliminating the need for manual cleaning.

[0026] like Figure 4 As shown. The top of the sludge blowing pipe 10 is connected to a top blowing pipe 15, which is located directly below the sludge discharge hole 4 at the top of the sludge discharge pipe 3. Side blowing ports 16 are arranged on both sides of the top of the sludge blowing pipe 10. The top blowing pipe 15 at the top of the sludge blowing pipe 10 is used to backflush the sludge discharge hole 4 at the top of the sludge discharge pipe 3, and the side blowing ports 16 on both sides of the sludge blowing pipe 10 are used to flush the sludge inside the sludge discharge pipe 3, so as to avoid blockage inside the sludge discharge pipe 3.

[0027] like Figure 3 As shown. The top blowing pipes 15 are arranged at equal intervals along the axial direction of the mud discharge pipe 3. Mud discharge holes 4 are set at equal intervals at the top of the mud discharge pipe 3 to ensure the efficiency of mud discharge. The top blowing pipes 15 are arranged one-to-one with the mud discharge holes 4, and the mud discharge holes 4 are cleaned accurately by the top blowing pipes 15.

[0028] like Figure 4 As shown, to ensure that the top-blowing pipe 15 can flush away the sludge or debris blocking the sludge discharge hole 4, the diameter of the internal channel of the top-blowing pipe 15 decreases from bottom to top. By adjusting the diameter of the top-blowing pipe 15, the flushing capacity is enhanced.

[0029] like Figure 4 As shown. The side air inlet 16 is inclined, and the orifice located inside the mud-blowing pipe 10 is higher than the orifice on the outside. The inclined side air inlet 16 can flush the inner bottom of the mud discharge pipe 3 and the gap between the mud discharge pipe 3 and the mud-blowing pipe 10, so as to prevent sludge or debris from accumulating in the inner bottom or gap of the mud discharge pipe 3 for a long time.

[0030] like Figure 4 As shown. The mud blowing pipe 10 is located at the inner bottom of the mud discharge pipe 3. A pad 12 is fixedly connected to the inner bottom of the mud discharge pipe 3. The top of the pad 12 is provided with an arc-shaped groove for accommodating the mud blowing pipe 10. By setting the pad 12, the bottom of the pad 12 fits against the inner wall of the mud discharge pipe 3. The pad 12 is used to install the mud blowing pipe 10, ensuring the stability of the installation of the mud blowing pipe 10. Moreover, the mud blowing pipe 10 will generate a reaction force during the backflushing process. The pad 12 increases the contact area between the mud blowing pipe 10 and the mud discharge pipe 3, preventing the mud discharge pipe 3 from deforming.

[0031] like Figure 4 As shown, the top two sides of the pad 12 are provided with arc-shaped flow guiding structures, which are connected to the inner wall of the mud discharge pipe 3. The side blowing port 16 is arranged facing the flow guiding structure. By raising the gap between the mud discharge pipe 3 and the mud blowing pipe 10 through the two sides of the pad 12, the side blowing port 16 can directly act on the bottom of the pad 12, accurately acting on the bottom of the mud discharge pipe 3. Moreover, the flow guiding structure makes the backflushing more comprehensive.

[0032] like Figure 4 As shown, to facilitate the assembly and disassembly of the mud-blowing pipe 10, a bolt 13 is fixedly connected to the bottom of the mud-blowing pipe 10. The bolt 13 passes through the pad 12 and the mud discharge pipe 3, and a locking nut 14 is threaded onto the bolt section outside the mud discharge pipe 3. The mud-blowing pipe 10 can be detached and installed using the bolt 13 and the nut 14, making it relatively convenient to replace and maintain the mud-blowing pipe 10.

[0033] like Figure 2 As shown. The sludge discharge pipe 3 is arranged in the sludge discharge trough 2 at the bottom of the secondary sedimentation tank 1, and a sludge scraping device is rotatably arranged above the sludge discharge trough 2. The sludge scraping device can scrape the sludge into the sludge discharge trough 2, and the sludge accurately enters the sludge discharge hole 4 through the sludge discharge trough 2, and is discharged externally through the sludge discharge pipe 3.

[0034] As a preferred embodiment of this utility model, the external high-pressure fluid conveying device conveys high-pressure gas, supernatant liquid, or clean water. The supernatant liquid can be directly utilized from the supernatant liquid in the effluent tank 5 of the secondary sedimentation tank 1.

Claims

1. A device for flushing accumulated sludge at the bottom of a horizontal flow secondary sedimentation tank, characterized in that: It includes a mud blowing pipe (10) arranged in parallel inside the mud discharge pipe (3), and a backflush pipe (9) connected to the pump suction pipe (7) connected to the output end of the mud discharge pipe (3). The backflush pipe (9) is connected to the mud blowing pipe (10) through the connecting pipe inside the pump suction pipe (7). Backflush channels are provided on the top and sides of the mud blowing pipe (10). The input end of the backflush pipe (9) is connected to an external high-pressure fluid conveying device.

2. The horizontal flow secondary sedimentation tank bottom sludge flushing device as described in claim 1, characterized in that: The top of the mud blowing pipe (10) is connected to a top blowing pipe (15), which is located directly below the mud discharge hole (4) at the top of the mud discharge pipe (3). Side blowing ports (16) are arranged on both sides of the top of the mud blowing pipe (10).

3. The horizontal flow secondary sedimentation tank bottom sludge flushing device as described in claim 2, characterized in that: The top blowing pipe (15) is arranged at equal intervals along the axial direction of the mud discharge pipe (3).

4. The horizontal flow secondary sedimentation tank bottom sludge flushing device as described in claim 2, characterized in that: The diameter of the internal channel of the top blowing pipe (15) decreases from bottom to top.

5. The horizontal flow secondary sedimentation tank bottom sludge flushing device as described in claim 2, characterized in that: The side blowhole (16) is inclined, and the orifice located inside the mud blowing pipe (10) is higher than the orifice on the outside.

6. The device for flushing sludge at the bottom of a horizontal flow secondary sedimentation tank as described in claim 5, characterized in that: The mud blowing pipe (10) is located at the inner bottom of the mud discharge pipe (3). A pad (12) is fixedly connected to the inner bottom of the mud discharge pipe (3). An arc-shaped groove for accommodating the mud blowing pipe (10) is provided on the top of the pad (12).

7. The horizontal flow secondary sedimentation tank bottom sludge flushing device as described in claim 6, characterized in that: Both sides of the top of the pad (12) are provided with arc-shaped flow guiding structures, which are connected to the inner wall of the mud discharge pipe (3). The side blowing port (16) is set towards the flow guiding structure.

8. The horizontal flow secondary sedimentation tank bottom sludge flushing device as described in claim 6, characterized in that: The bottom of the mud blowing pipe (10) is fixedly connected with a bolt (13), which passes through the pad (12) and the mud discharge pipe (3). A locking nut (14) is threaded on the bolt section outside the mud discharge pipe (3).

9. The device for flushing sludge at the bottom of a horizontal flow secondary sedimentation tank as described in claim 1, characterized in that: The sludge discharge pipe (3) is arranged in the sludge discharge trough (2) at the bottom of the secondary sedimentation tank (1), and a sludge scraping device is arranged rotatably above the sludge discharge trough (2).

10. The device for flushing sludge at the bottom of a horizontal flow secondary sedimentation tank as described in claim 1, characterized in that: The external high-pressure fluid transport device transports high-pressure gas, upper clear liquid, or clean water.

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