Intermediate tank for activated sludge wastewater treatment

Abstract

This invention relates to the field of wastewater treatment technology, specifically an intermediate tank for activated sludge wastewater treatment. The intermediate tank comprises a tank body, an aeration assembly, and a sludge removal assembly. The aeration assembly is located at the bottom of the tank, while the sludge removal assembly is located inside the tank bottom, above the aeration assembly. The tank body automatically removes scum as the internal liquid level rises and falls, ensuring precise removal and allowing for convenient, periodic, and centralized scum removal. As aeration occurs, scum is generated on the surface of the tank body. Each time water is discharged through the drain pipe, the water flows towards the drain pipe, and the liquid level moves accordingly. When the water passes through the filter, the scum is caught and collected by the sludge net. The system features synchronized sludge removal with the liquid level, resulting in precise and effective removal.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an intermediate tank for activated sludge wastewater treatment that provides precise scum removal, good scum removal effect, rapid scum discharge, and facilitates scum discharge. Background Technology

[0002] The activated sludge process is an aerobic biological treatment method for wastewater. The activated sludge process and its derivative improved processes are the most widely used methods for treating municipal wastewater. It can remove dissolved and colloidal biodegradable organic matter, as well as suspended solids and other substances that can be adsorbed by activated sludge from wastewater. It can also remove some phosphorus and nitrogen. It is a general term for various methods of biological wastewater treatment using suspended microorganisms in water.

[0003] Scum formation in biological systems often occurs on the walls and corners of aeration tanks, and around the inner ring baffle of the effluent weir in secondary sedimentation tanks (intermediate tanks). The scum generated in aeration tanks mainly originates from abnormal metabolism within the activated sludge system itself, and also includes some inorganic particles that flow into the biological system and float to the surface after aeration. Foam formation can be attributed to increased water viscosity, primarily due to excessively high organic matter content in the water, aging of the mixed liquor sludge in the aeration tank, filamentous bacterial bulking, and the presence of surfactants in the influent.

[0004] In existing technologies, when treating scum in the intermediate tank, because this part is dead sludge and has a density lower than water due to its high air bubble content, it is difficult to settle. Generally, it is introduced into the sludge collection tank by overflow. This method will cause a large amount of sewage to flow into the sludge collection tank at the same time, reducing the sewage treatment effect. Alternatively, the oxygenation at the end of the aeration tank can be increased. This method is slow and the problem of scum accumulation will still occur after a long time, failing to meet the required scum discharge standard. Summary of the Invention

[0005] The present invention aims to solve the problem of scum treatment in intermediate tanks by providing an activated sludge wastewater treatment intermediate tank that offers precise scum removal, good scum removal effect, rapid scum discharge, and facilitates scum discharge.

[0006] The activated sludge wastewater treatment intermediate tank of the present invention is characterized in that the intermediate tank includes a tank body, an aeration assembly, and a sludge removal assembly, wherein the aeration assembly is disposed at the bottom of the tank, and the sludge removal assembly is disposed inside the tank bottom, above the aeration assembly; wherein:

[0007] The two side walls of the pool are provided with symmetrical guide grooves, which are parallelogram-shaped.

[0008] The slag removal assembly includes a cylindrical frame, a diversion mechanism, and a drive mechanism. The cylindrical frame is suspended above the liquid surface inside the tank. Guide columns are fixedly connected to both sides of the cylindrical frame, and the guide columns slide along the inner side of the guide channel. A scooping net is fixedly installed on the inner wall of the cylindrical frame. Two symmetrical spiral blades are rotatably installed on the inner side of the cylindrical frame. An outlet pipe is fixedly embedded on the inner wall of the tank near the guide channel. A baffle is movably installed on the side wall of the tank to block the outlet pipe. A diversion mechanism is provided on the inner side of the outlet pipe and at the end of the spiral blades near the outlet pipe. When the liquid level in the tank rises and then falls, the cylindrical frame pushes open the baffle. The side cross-section of the cylindrical frame is three-quarters circular. Two side plates are fixedly installed at the upper end of the cylindrical frame, and a float is fixedly installed between the two side plates. The guide columns are fixedly connected to the side surface of the side plates. End frames are fixedly installed on the inner side of the cylindrical frame near both ends and the middle. A rotating shaft is rotatably connected between the two end frames on both sides. The rotating shaft passes through the spiral blades and is fixedly connected to the spiral blades.

[0009] The drainage mechanism includes a driven blade fixedly connected to one end of the rotating shaft near the delivery pipe, and an active blade that is rotated and installed inside the delivery pipe by a drive mechanism. When the cylinder frame is aligned with the delivery pipe, the active blade draws liquid, causing the driven blade to be driven by the liquid. An oblique opening is fixedly connected to the end of the delivery pipe.

[0010] The drive mechanism includes a mounting bracket fixedly installed on the side surface of the pool body, a first motor fixedly installed on the side of the mounting bracket, a drive shaft fixedly connected to the output shaft of the first motor, and an active paddle fixedly connected to the end of the drive shaft.

[0011] The aeration assembly includes a main pipe fixedly installed on the bottom surface of the tank body, several branch pipes fixedly installed on one side of the outer surface of the main pipe, several aeration heads fixedly installed on the upper surface of the branch pipes, an inlet pipe fixedly connected to the other side of the main pipe, and a drain pipe installed on the side surface of the tank body near the inlet pipe.

[0012] The slag removal assembly also includes an overflow plate fixedly installed on the inner wall of the tank. A top frame is fixedly installed on the upper end of the tank near the overflow plate. A second motor is fixedly installed on the upper surface of the top frame. An agitator shaft is fixedly connected to the output shaft of the second motor. An agitator blade is fixedly installed on the outer surface of the agitator shaft near the lower end.

[0013] A connecting rod is fixedly connected to the outer surface of the baffle. The end of the connecting rod is rotatably connected to the inner wall of the pool via a connecting shaft. An arc-shaped rod is fixedly connected to the lower surface of the connecting rod. The lower end of the arc-shaped rod is slidably inserted into the inner side of the arc-shaped cylinder, and the arc-shaped rod and the arc-shaped cylinder are elastically connected. The arc-shaped cylinder is fixedly installed on the inner wall of the pool. A compression spring is provided on the inner side of the arc-shaped cylinder. A slider is fixedly connected to one end of the arc-shaped rod that is inserted into the inner side of the arc-shaped cylinder. The slider slides in cooperation with the inner wall of the arc-shaped cylinder.

[0014] The tank of this invention can automatically remove scum as the inner liquid level rises and falls, with precise removal and convenient control for periodic centralized removal of scum, making operation convenient. As aeration proceeds, scum will be generated on the liquid surface inside the tank. Each time the drain pipe discharges water, the water flow will move towards the drain pipe, and the liquid surface will move accordingly. When the water on the liquid surface passes through the cylinder frame, the scum will be blocked by the scooping net and collected. It has the function of synchronously rising and falling with the liquid level for scooping, with precise removal and good effect. When it is necessary to collect and discharge scum, as the sewage discharge proceeds and the cylinder frame moves downward, the guide column slides to the sinking point, and then sewage is added. The water level rises, the float rises, and the cylinder frame rises. As the liquid level changes, after the cylinder frame reaches the suspension point, when the liquid level drops again, the cylinder frame will move downward and open the baffle. At this time, the first motor works, causing the active paddle to rotate and suck up the water near the liquid surface in the pool to remove the scum. At the same time, due to the water flow, the driven paddle also rotates, driving the rotating shaft to rotate, causing the spiral blades to stir and push the scum accumulated in the scoop net to the discharge pipe. Therefore, it has the function of rapid scum discharge and can effectively reduce the flow of sewage during scum discharge. When the cylinder frame moves down and abuts the baffle, the arc-shaped rod will slide along the inner side of the arc-shaped cylinder, compressing the spring. When the cylinder frame moves down and moves away, the spring force of the compression spring can push the arc-shaped rod, thereby causing the baffle to reset and block the outlet pipe again, ensuring that sewage will not leak out when the liquid level inside the tank rises. It has an automatic opening and closing function, which is conducive to the discharge of scum. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle.

[0017] Figure 3 This is a cross-sectional view of the present invention.

[0018] Figure 4 This is a schematic diagram of the tube frame of the present invention.

[0019] Figure 5 For the present invention Figure 4 Enlarged view of section B in the middle.

[0020] Figure 6 This is a partial view of the tube frame of the present invention.

[0021] Figure 7 This is a schematic diagram of the tube frame from another perspective of the present invention.

[0022] Figure 8 This is a schematic diagram of the inner wall of one side of the pool body according to the present invention.

[0023] Figure 9This is a schematic diagram of the baffle of the present invention.

[0024] Figure 10 This is a diagram showing the state of the tank body during slag discharge according to the present invention.

[0025] Figure 11 This is a schematic diagram of the discharge cylinder during slag discharge according to the present invention.

[0026] Figure 12 This is a schematic diagram of the guide groove and guide post of the present invention.

[0027] The components are as follows: 1. Pool body; 2. Guide channel; 3. Cylinder frame; 4. Net; 5. Side plate; 6. Float; 7. Guide column; 8. Rotating shaft; 9. Spiral blade; 10. End frame; 11. Driven blade; 12. Discharge pipe; 13. Active blade; 14. Drive shaft; 15. Mounting frame; 16. First motor; 17. Inclined opening; 18. Baffle; 19. Connecting rod; 20. Connecting shaft; 21. Arc rod; 22. Slider; 23. Arc cylinder; 24. Compression spring; 25. Overflow plate; 26. Top frame; 27. Second motor; 28. Agitator shaft; 29. ​​Agitator blade; 30. Thickened section; 31. Inlet pipe; 32. Main pipe; 33. Branch pipe; 34. Aeration head; 35. Drain pipe; 36. Sinking point; 37. Suspension point. Detailed Implementation

[0028] Example 1: A kind of Figures 1-12 The diagram shows an intermediate tank for activated sludge wastewater treatment, comprising a tank body 1. Symmetrical guide channels 2 are formed on both side walls of the tank body 1. The guide channels 2 are parallelogram-shaped. Thickened portions 30 are provided on the side surfaces of the tank body 1 corresponding to the guide channels 2 to ensure the structural strength of the tank body 1. A cylindrical frame 3 is suspended above the liquid surface on the inner side of the tank body 1. Guide columns 7 are fixedly connected to both sides of the cylindrical frame 3, and the guide columns 7 slide along the inner side of the guide channels 2. A net 4 is fixedly installed on the inner wall of the cylindrical frame 3. Figures 3-6 as well as Figure 10 , Figure 11 In order to ensure the clarity of the structure, the net 4 is not shown. Two symmetrical spiral blades 9 are rotatably installed on the inner side of the cylinder frame 3. The inner wall of the pool body 1 is fixedly embedded on the side near the guide groove 2. The side wall of the pool body 1 is movably installed with a baffle 18 to block the delivery pipe 12. The inner side of the delivery pipe 12 and the spiral blades 9 are provided with a diversion mechanism at the end of the delivery pipe 12.

[0029] When the liquid level in pool 1 rises and then falls, the cylinder frame 3 opens the baffle 18.

[0030] This tank 1 can automatically remove scum as the inner liquid level rises and falls. The scum removal is precise and can be easily controlled for regular centralized removal, making it convenient to operate.

[0031] like Figure 3 , Figure 4 , Figure 5 As shown, the side cross-section of the cylindrical frame 3 is three-quarters circular. Two side plates 5 are fixedly installed at the upper end of the cylindrical frame 3, and a float 6 is fixedly installed between the two side plates 5. The guide post 7 is fixedly connected to the side surface of the side plate 5. The side plate 5 slides against the side wall of the pool body 1, which can ensure the stability of the cylindrical frame 3 and prevent it from tilting and getting stuck.

[0032] End frames 10 are fixedly installed on the inner side of the tube frame 3 near both ends and the middle. A rotating shaft 8 is rotatably connected between the two end frames 10 on both sides. The rotating shaft 8 passes through the spiral blade 9 and is fixedly connected to the spiral blade 9 to ensure the rotational installation of the rotating shaft 8.

[0033] like Figure 11 As shown, the diversion mechanism includes a driven blade 11 fixedly connected to one end of the rotating shaft 8 near the outlet pipe 12, and an active blade 13 rotatably installed inside the outlet pipe 12 via a drive mechanism. When the cylinder frame 3 is aligned with the outlet pipe 12, the active blade 13 draws liquid, causing the driven blade 11 to be driven by the liquid. An oblique opening 17 is fixedly connected to the end of the outlet pipe 12 to facilitate the discharge of scum and sewage.

[0034] like Figure 2 As shown, the drive mechanism includes a mounting bracket 15 fixedly installed on the side surface of the pool body 1. A first motor 16 is fixedly installed on the side of the mounting bracket 15. The output shaft of the first motor 16 is fixedly connected to a drive shaft 14. The end of the drive shaft 14 is fixedly connected to an active paddle 13.

[0035] like Figure 8 , Figure 9 As shown, a connecting rod 19 is fixedly connected to the outer surface of the baffle 18. The end of the connecting rod 19 is rotatably connected to the inner wall of the pool body 1 through a connecting shaft 20. An arc-shaped rod 21 is fixedly connected to the lower surface of the connecting rod 19. The lower end of the arc-shaped rod 21 is slidably inserted into the inner side of the arc-shaped cylinder 23, and the arc-shaped rod 21 is elastically connected to the arc-shaped cylinder 23. The arc-shaped cylinder 23 is fixedly installed on the inner wall of the pool body 1.

[0036] A compression spring 24 is provided on the inner side of the arc-shaped cylinder 23, and a slider 22 is fixedly connected to one end of the arc-shaped rod 21 that is inserted into the inner side of the arc-shaped cylinder 23. The slider 22 slides in cooperation with the inner wall of the arc-shaped cylinder 23.

[0037] like Figure 3As shown, it also includes an overflow plate 25 fixedly installed on the inner wall of the tank body 1. A top frame 26 is fixedly installed on the upper end of the tank body 1 near the overflow plate 25. A second motor 27 is fixedly installed on the upper surface of the top frame 26. The output shaft of the second motor 27 is fixedly connected to an agitator shaft 28. An agitator blade 29 is fixedly installed on the outer surface of the agitator shaft 28 near the lower end. The second motor 27 drives the agitator shaft 28 to rotate, which in turn causes the agitator blade 29 to rotate, agitating the returned sludge and allowing it to flow through the top of the overflow plate 25 to the inner side of the tank body 1.

[0038] It also includes a main pipe 32 fixedly installed on the bottom surface of the tank body 1. Several branch pipes 33 are fixedly installed on one side of the outer surface of the main pipe 32. Several aeration heads 34 are fixedly installed on the upper surface of the branch pipes 33. An inlet pipe 31 is fixedly connected to the other side of the outer surface of the main pipe 32 to allow air to pass through. After passing through the main pipe 32 and the branch pipes 33, the air is sprayed out from the aeration heads 34 for aeration. A drain pipe 35 is installed on the side surface of the tank body 1 near the inlet pipe 31 to discharge sewage.

[0039] As aeration proceeds, scum will form on the surface of the liquid inside tank 1. Each time water is discharged through drain pipe 35, the water flows towards drain pipe 35, and the liquid surface moves accordingly. When the water on the surface passes through the cylinder frame 3, the scum will be blocked and collected by the scoop net 4. This net has a function of rising and falling synchronously with the liquid level for precise scooping. When scum needs to be discharged in a concentrated manner, as wastewater is discharged and the cylinder frame 3 moves downward, the guide column 7 slides to the sinking point 36, and then wastewater is added. The water level rises, the float 6 rises, and the cylinder frame 3 rises. As the liquid level changes, the cylinder frame 3 reaches the suspension point 37. When the liquid level drops again, the cylinder frame 3 will move downward, opening the baffle 18, and the cylinder frame 3 will reach the... Figure 10 At the indicated position, the first motor 16 operates, causing the active paddle 13 to rotate and draw water from the pool 1 near the liquid surface to remove scum. Simultaneously, the water flow causes the driven paddle 11 to rotate, driving the shaft 8 to rotate and causing the spiral blades 9 to agitate, pushing the scum accumulated in the net 4 to the discharge pipe 12. Therefore, it has a rapid scum discharge function and effectively reduces wastewater runoff during scum discharge. Figure 12 As shown in the diagram, the arrows indicate the direction of movement of the guide column 7 during this process. The design of the guide channel 2 ensures that the movement trajectory is as shown by the arrows when the suspension point 37 moves down and the sinking point 36 moves up. When the cylinder frame 3 moves down and abuts against the baffle 18, the arc-shaped rod 21 will slide along the inner side of the arc-shaped cylinder 23, squeezing the compression spring 24. When the cylinder frame 3 moves down and moves away, under the elastic force of the compression spring 24, it can push the arc-shaped rod 21, thereby causing the baffle 18 to reset and block the outlet pipe 12 again, ensuring that the sewage will not leak out when the liquid level inside the tank 1 rises. It has an automatic opening and closing function, which is conducive to the discharge of scum.

Claims

1. An activated sludge sewage treatment intermediate tank, characterized in that The treatment intermediate tank comprises a tank body, an aeration assembly and a slag removal assembly. The aeration assembly is arranged at the bottom of the tank body, and the slag removal assembly is arranged inside the tank body and above the aeration assembly. The two side walls of the tank body are provided with symmetrical guide grooves in the shape of parallelogram. The slag removal assembly comprises a cylinder frame, a flow guide mechanism and a driving mechanism. The cylinder frame is arranged inside the tank body and suspended on the liquid surface. Two guide columns are fixedly connected to the two sides of the cylinder frame. The guide columns slide along the inner side of the guide groove. A fishing net is fixedly installed on the inner wall of the cylinder frame. Two symmetrical spiral blades are rotatably installed on the inner side of the cylinder frame. A delivery pipe is fixedly embedded on the side of the tank body close to the guide groove. A baffle is movably installed on the side wall of the tank body to shield the delivery pipe. The inner side of the delivery pipe is provided with the flow guide mechanism close to one end of the spiral blade. When the liquid surface in the tank body rises and then falls, the cylinder frame pushes open the baffle. The side cross section of the cylinder frame is three-fourths of a circle. Two side plates are fixedly installed on the upper end of the cylinder frame. A floating block is fixedly installed between the two side plates. The guide columns are fixedly connected to the side surface of the side plates. End frames are fixedly arranged on the inner side of the cylinder frame close to the two ends and the middle. A rotating shaft is rotatably connected between the two end frames on the two sides. The rotating shaft penetrates the spiral blades and is fixedly connected with the spiral blades. The flow guide mechanism comprises a driven paddle fixedly connected to the rotating shaft close to the delivery pipe and a driving paddle rotatably installed on the inner side of the delivery pipe by the driving mechanism. When the cylinder frame is aligned with the delivery pipe, the driving paddle sucks liquid to drive the driven paddle by the liquid. The end of the delivery pipe is fixedly connected with a bevel. The driving mechanism comprises a mounting frame fixedly installed on the side surface of the tank body. A first motor is fixedly installed on the side surface of the mounting frame. The output shaft of the first motor is fixedly connected with a driving shaft. The end of the driving shaft is fixedly connected with the driving paddle. The aeration assembly comprises a main pipe fixedly installed on the inner bottom surface of the tank body. A plurality of branch pipes are fixedly installed on one side of the outer surface of the main pipe. A plurality of aeration heads are fixedly arranged on the upper surface of the branch pipes. Another side of the outer surface of the main pipe is fixedly connected with an inlet pipe. The side surface of the tank body close to the inlet pipe is provided with a drain pipe. The slag removal assembly further comprises an overflow plate fixedly arranged on the inner wall of the tank body. A top frame is fixedly installed on the side of the upper end of the tank body close to the overflow plate. A second motor is fixedly installed on the upper surface of the top frame. The output shaft of the second motor is fixedly connected with an agitating shaft. Agitating blades are fixedly installed on the outer surface of the agitating shaft close to the lower end. The outer surface of the baffle is fixedly connected with a connecting rod. The end of the connecting rod is rotatably connected with the inner wall of the tank body through a connecting shaft. The lower surface of the connecting rod is fixedly connected with an arc-shaped rod. The lower end of the arc-shaped rod is slidably inserted into the inner side of an arc-shaped cylinder. The arc-shaped rod is elastically connected with the arc-shaped cylinder. The arc-shaped cylinder is fixedly installed on the inner wall of the tank body. The inner side of the arc-shaped cylinder is provided with a compression spring. The end of the arc-shaped rod inserted into the inner side of the arc-shaped cylinder is fixedly connected with a sliding block. The sliding block is slidably matched with the inner wall of the arc-shaped cylinder.

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