Aeration bracket for relieving floating of sludge in vertical-flow sedimentation tank

Abstract

The utility model provides an aeration bracket for reducing upward floating of sludge in a vertical-flow sedimentation tank. The aeration bracket comprises a tank body, a water inlet pipe, a central cylinder, a reflecting plate, an air inlet pipe, an aeration pipe and aeration holes, the upper end of the central cylinder is fixed on the inner side of the top wall of the tank body, the lower end extends from the middle position of the inner cavity of the tank body to the bottom of the tank body, and the bottom of the lower end is connected with a reflecting plate; the water outlet end of the water inlet pipe is communicated with the central cylinder; one end of the air inlet pipe extends out of the tank body, and the other end is communicated with the aerator pipe; the bottom of the aeration pipe is placed on the inner side wall of the sludge hopper at the bottom of the tank body; and a plurality of aeration holes are formed in the aeration pipe at intervals. According to the bracket, on one hand, the influence that sludge floats upwards, the effluent quality of the sedimentation tank exceeds the standard and the like due to sludge accumulation at dead corners of the sludge settling bucket of the vertical-flow sedimentation tank is avoided; on the other hand, the workload of manually salvaging float sludge can be reduced, the manual operation risk is reduced, and manpower and material resources are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment equipment, and particularly relates to an aeration support for reducing sludge floating in a vertical sedimentation tank. Background Art

[0002] A vertical sedimentation tank, also known as a vertical sedimentation basin, is a sedimentation tank in which wastewater flows vertically. Its planar shape is usually circular or square. Water enters the tank from top to bottom through an inlet pipe located at the center of the tank. An umbrella-shaped baffle is provided under the inlet pipe. Suspended solids will settle into the conical sludge hopper at the bottom of the tank, and the clarified water will flow out from the peripheral overflow weir along the periphery of the tank.

[0003] The advantages of a vertical sedimentation tank are small floor area, easy sludge discharge, and high sedimentation efficiency. However, its disadvantages are large depth, difficult construction, and high cost. Therefore, this type of sedimentation tank is commonly used in pilot test equipment or enterprise sewage treatment stations with small water treatment volumes.

[0004] However, it is found in use that a vertical sedimentation tank, especially a square sedimentation tank, cannot be equipped with a sludge scraping device. Large pieces of sludge often adhere to the edges of the conical sludge hopper at its bottom. If not discharged for a long time, denitrification will occur inside the sludge, gradually floating to the surface of the sedimentation tank, affecting the clarity of the sedimentation tank surface and the appearance. Moreover, the floating sludge flowing out with the water into the drainage tank will cause the drainage water quality to deteriorate, and there is even a risk of exceeding the emission standard.

[0005] Therefore, it is necessary to design a device that can reduce sludge floating in a vertical sedimentation tank, avoid the influence caused by sludge floating in the sedimentation tank, and ensure that the effluent water quality of the sedimentation tank meets the standard. Summary of the Invention

[0006] Technical Solution: To solve the technical problem that sludge floating easily occurs during the use of the above-mentioned vertical sedimentation tank and affects the effluent water quality, the utility model provides an aeration support for reducing sludge floating in a vertical sedimentation tank, specifically including a tank body, an inlet pipe, a central cylinder, a baffle, an inlet air pipe, an aeration pipe, and aeration holes; the upper end of the central cylinder is fixedly connected to the inner side of the top wall of the tank body, the lower end extends from the middle position of the inner cavity of the tank body towards the bottom of the tank body, and a baffle is connected and installed at the bottom of the lower end; the water outlet end of the inlet pipe is communicated with the central cylinder; one end of the inlet air pipe extends out of the tank body, and the other end is communicated with the aeration pipe; the bottom of the aeration pipe is placed at the inner side wall position of the sludge hopper at the bottom of the tank body; the aeration holes are arranged on the aeration pipe and are distributed at intervals.

[0007] As an improvement, it further includes a sludge discharge pipe and a sludge pump. The sludge discharge pipe is installed inside the tank body and is located on the other side of the inlet air pipe. One end of the sludge discharge pipe extends out of the tank body and is installed with a sludge pump; the other end extends into the bottom of the tank body.

[0008] As an improvement, it further includes a water outlet and an overflow weir; the overflow weir is installed on the inner side walls at the upper end of the pool body with the central cylinder as the center; the water outlet is arranged on one side of the overflow weir inside the pool body.

[0009] As an improvement, the bottom of the pool body is a conical sludge hopper structure.

[0010] As an improvement, it further includes a water inlet valve and an aeration valve; the water inlet valve is arranged at the inlet end of the water inlet pipe, and the aeration valve is arranged at the air inlet end of the air inlet pipe.

[0011] As an improvement, the aeration pipe is a hexahedron support structure, and all the side surfaces are installed parallel to the side surfaces of the sludge hopper of the pool body.

[0012] As an improvement, when arranging the aeration holes, the number gradually increases from near to far from the air inlet pipe; among them, at the position closest to the air inlet pipe and the farthest position, the ratio of the spacing between the aeration holes is (5 - 2):1.

[0013] Beneficial effects: The support proposed by the present utility model, on the one hand, avoids the accumulation of sludge in the dead corners of the sludge hopper of the vertical flow sedimentation tank, which may cause problems such as sludge floating and exceeding the standard of the effluent quality of the sedimentation tank; on the other hand, it can reduce the workload of manually salvaging floating sludge, reduce the risk of manual operation, and reduce human and material resources. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present utility model.

[0015] Figure 2 It is a schematic structural diagram of the device of the present utility model.

[0016] In the figure: pool body 1, water inlet pipe 2, water inlet valve 3, central cylinder 4, reflector 5, water outlet 7, overflow weir 6, sludge discharge pipe 8, sludge pump 9, aeration valve 10, air inlet pipe 11, aeration pipe 12, aeration hole 13. Detailed Embodiments

[0017] The following combines examples to further describe in detail the specific embodiments of the present utility model. The following examples are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0018] See Figure 1As shown in the figure, the aeration support for reducing the sludge floating in the vertical flow sedimentation tank includes a tank body 1, a water inlet pipe 2, a central cylinder 4, a reflection plate 5, an air inlet pipe 11, an air distribution pipe 12, and air holes 13. The upper end of the central cylinder 4 is fixed to the inner side of the top wall of the tank body 1, and the lower end extends from the middle position of the inner cavity of the tank body 1 towards the bottom of the tank body 1, and a reflection plate 5 is connected and installed at the bottom of the lower end. The water outlet end of the water inlet pipe 2 is communicated with the central cylinder 4. One end of the air inlet pipe 11 extends outside the tank body 1, and the other end is communicated with the air distribution pipe 12. The bottom of the air distribution pipe 12 is placed at the inner side wall position of the sludge hopper at the bottom of the tank body 1. The air holes 13 are arranged on the air distribution pipe 12, and a plurality of them are distributed at intervals.

[0019] In the present utility model, it further includes a sludge discharge pipe 8 and a sludge pump 9. The sludge discharge pipe 8 is installed inside the tank body 1 and on the other side of the air inlet pipe 11. One end of the sludge discharge pipe 8 extends outside the tank body 1 and a sludge pump 9 is installed; the other end extends into the bottom of the tank body 1.

[0020] Furthermore, it further includes a water outlet 7 and an overflow weir 6. The overflow weir 6 is installed on the two inner side walls at the upper end of the tank body 1 with the central cylinder 4 as the center; the water outlet 7 is arranged on one side of the overflow weir 6 inside the tank body 1.

[0021] As a specific implementation manner of the present utility model, the bottom of the tank body 1 is a conical sludge hopper structure.

[0022] In the present utility model, it further includes a water inlet valve 3 and an aeration valve 10. The water inlet valve 3 is arranged at the inlet end of the water inlet pipe 2, and the aeration valve 10 is arranged at the air inlet end of the air inlet pipe 11.

[0023] See Figure 2 As shown in the figure, the air distribution pipe 12 is a hexahedron support structure, and all the side surfaces are installed parallel to the side surfaces of the sludge hopper of the tank body 1. When the air holes 13 are arranged, the number gradually increases from the position close to the air inlet pipe 11 to the far position; among them, at the position closest to the air inlet pipe and the farthest position, the ratio of the air hole spacing is (5 - 2):1.

[0024] In the present utility model, water enters the central cylinder arranged in the center of the tank through the water inlet pipe, and enters the tank from top to bottom. An umbrella-shaped reflection plate is arranged below the central cylinder, and the suspended matter will settle into the conical sludge hopper at the bottom of the tank, and the clarified water will flow out from the peripheral overflow weir along the periphery of the tank. The air distribution pipes are connected to each other by bent pipes and placed in the conical sludge hopper at the bottom of the vertical flow sedimentation tank, and the air distribution pipes are attached to and fixed to each edge of the conical sludge hopper.

[0025] A number of air holes are arranged on the air distribution pipe, and the air holes are arranged towards the edge being attached, so as to cause as little disturbance to the tank body as possible during aeration. The air holes become denser from the air inlet pipe to the far end, and the ratio of the air hole spacing at the position closest to the air inlet pipe and the farthest position is (5 - 2):1. Making the openings denser can prevent insufficient air volume at the far end.

[0026] As a specific embodiment of the present utility model, the water inlet valve 3 and the aeration valve 10 are both electric valves, and all electric valves and the sludge pump 9 are controlled by a PLC program. The automatic control steps are as follows: First, close the water inlet valve 3 of the water inlet pipe 2 to stop water inlet; at the same time, turn on the sludge pump 9 on the sludge discharge pipe 8 to discharge sludge for 2 - 10 minutes to discharge the remaining sludge from the system, and by the way, lower the water level in the vertical flow sedimentation tank below the overflow weir 6 to prevent muddy water from entering the water outlet 7 during aeration and affecting the water quality of the outlet water; next, open the aeration valve for 1 - 3 minutes to disperse the sludge in the dead corner of the sludge hopper; after aeration is completed, close the aeration valve 10 and let it stand for 3 - 10 minutes to allow the sludge to settle to the bottom of the vertical flow sedimentation tank; finally, open the water inlet valve 3 to operate with normal water inlet.

[0027] Example 1:

[0028] The aeration holes gradually become denser from the inlet pipe to the far end. The distance ratio of the aeration holes at the position closest to the inlet pipe to the middle position is 2:1, and the distance ratio of the aeration holes at the position closest to the inlet pipe to the farthest position is 4:1. The gas volume will gradually become smaller towards the far end. Making the openings denser can prevent insufficient gas volume.

[0029] Example 2:

[0030] The sewage station detects SV30 twice a day, determines the starting time of the sludge pump for this sludge discharge according to the detection results, and sets it on the automatic control program. The sedimentation tank aeration system is started. The steps are as follows: First, close the water inlet valve of the water inlet pipe to stop water inlet; at the same time, turn on the sludge pump on the sludge discharge pipe and discharge sludge for several minutes according to the set value to discharge the remaining sludge from the system, and by the way, lower the water level in the vertical flow sedimentation tank below the overflow weir to prevent muddy water from entering the water outlet during aeration and affecting the water quality of the outlet water; next, open the aeration valve for 2 minutes to disperse the sludge in the dead corner of the sludge hopper; after aeration is completed, close the aeration valve and let it stand for 5 minutes to allow the sludge to settle to the bottom of the vertical flow sedimentation tank; finally, open the water inlet valve to operate with normal water inlet.

[0031] This bracket aerates the dead corner of the sludge hopper of the vertical flow sedimentation tank to prevent sludge accumulation and sludge floating. Before aeration, the remaining sludge is discharged first to lower the liquid level of the sedimentation tank to prevent the muddy water mixture from flowing out with water body disturbance during cleaning. At the same time, the cleaning process is fully automated, which is convenient and fast, and reduces manpower and material resources.

[0032] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. An aeration support for reducing sludge floating in a vertical flow sedimentation tank, characterized in that: It includes a pool body (1), a water inlet pipe (2), a central cylinder (4), a reflector (5), an air inlet pipe (11), an air diffuser pipe (12), and air diffuser holes (13); the upper end of the central cylinder (4) is fixedly installed on the inner side of the top wall of the pool body (1), the lower end extends from the middle position of the inner cavity of the pool body (1) towards the bottom of the pool body (1), and a reflector (5) is connected and installed at the bottom of the lower end; the water outlet end of the water inlet pipe (2) is communicated with the central cylinder (4); one end of the air inlet pipe (11) extends outside the pool body (1), and the other end is communicated with the air diffuser pipe (12); the bottom of the air diffuser pipe (12) is placed at the position of the inner side wall of the sludge hopper at the bottom of the pool body (1). The air diffuser holes (13) are arranged on the air diffuser pipe (12) and are distributed at intervals in multiple numbers.

2. The aeration support for reducing sludge floating in a vertical flow sedimentation tank according to claim 1, characterized in that: It further includes a sludge discharge pipe (8) and a sludge pump (9). The sludge discharge pipe (8) is installed inside the pool body (1) and is located on the other side of the air inlet pipe (11). One end of the sludge discharge pipe (8) extends outside the pool body (1) and is installed with a sludge pump (9); the other end extends into the bottom of the pool body (1).

3. The aeration support for reducing sludge floating in a vertical flow sedimentation tank according to claim 1, wherein: It further includes a water outlet (7) and an overflow weir (6); the overflow weir (6) is installed on the two inner side walls at the upper end of the pool body (1) with the central cylinder (4) as the center; the water outlet (7) is arranged on one side of the overflow weir (6) inside the pool body (1).

4. The aeration support for reducing sludge floating in a vertical flow sedimentation tank according to claim 1, characterized in that: The bottom of the pool body (1) is a conical sedimentation hopper structure.

5. The aeration support for reducing sludge floating in the vertical flow sedimentation tank according to claim 1, characterized in that: It further includes a water inlet valve (3) and an aeration valve (10); the water inlet valve (3) is arranged at the inlet end of the water inlet pipe (2), and the aeration valve (10) is arranged at the air inlet end of the air inlet pipe (11).

6. The aeration support for reducing sludge floating in a vertical flow sedimentation tank according to claim 1, characterized in that: The air diffuser pipe (12) is a hexahedron support structure, and all the side surfaces are installed parallel to the side surfaces of the sedimentation hopper of the pool body (1).

7. The aeration support for reducing sludge floating in the vertical flow sedimentation tank according to claim 1, wherein: When the air diffuser holes (13) are arranged, the number gradually increases from the position close to the air inlet pipe (11) to the position far from the air inlet pipe (11). Among them, at the position closest to the air inlet pipe and the position farthest from the air inlet pipe, the ratio of the spacing of the air diffuser holes is (5 - 2):1.

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