Multi-stage tandem type filtering device for perfluorinated compound adsorption treatment

Abstract

The invention discloses a multi-stage tandem type filtering device for perfluorinated compound adsorption treatment, and relates to the field of wastewater treatment.The multi-stage tandem type filtering device comprises a tank body and a plurality of adsorption columns arranged in the tank body, and the tank body is in an incomplete ring shape; a piston is mounted at the water inlet end of the adsorption column and is hermetically attached to the inner wall of the tank body; a water permeable hole is formed in the middle of the piston; two connecting rods are fixedly connected between every two adjacent pistons; rotating assemblies are symmetrically arranged on the front side and the rear side of the tank body and used for driving the pistons to synchronously rotate along the axis of the tank body; a switching assembly is arranged above the tank body and used for replacing the adsorption column located on the piston on the outer side of the tank body. A sealing assembly is arranged at one end, close to the water inlet pipe, of the tank body and is used for ensuring that the side part of the tank body is sealed while the rotating assembly drives the piston to move; according to the invention, on the premise of uninterrupted water feeding and treatment, continuous and automatic operation of the system is guaranteed by replacing the adsorption column through rotation.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multi-stage series filtration device for the adsorption treatment of perfluorinated compounds. Background Technology

[0002] Perfluorinated compounds (PFCs) are a class of highly stable and persistent organic pollutants widely used in industries such as textiles, electroplating, fire protection, and semiconductor manufacturing. Their strong carbon-fluorine bonds make them difficult to degrade by the natural environment, easily accumulating in water and soil, and bioaccumulating through the food chain, posing a potential threat to the ecological environment and human health. Therefore, the efficient removal of PFCs from industrial wastewater and polluted water bodies has become an important issue in the field of environmental protection.

[0003] Currently, adsorption is one of the effective methods for treating low concentrations of perfluorinated compounds in water. Commonly used adsorbents include activated carbon, resin, and modified mineral materials. Existing adsorption treatment devices mostly adopt fixed-bed or single-stage filtration methods, which have the following shortcomings: 1. When the adsorbent becomes saturated, operation needs to be stopped to replace or regenerate the adsorbent, leading to interruptions in the treatment process and affecting the efficiency of continuous production or wastewater treatment; 2. Single-stage adsorption treatment often suffers from limited adsorption capacity, rapid breakthrough time, and incomplete treatment for low-concentration, high-flow-rate, or complex matrix wastewater, making it difficult to consistently meet the requirements for deep purification and discharge; 3. Some devices have complex designs, cumbersome replacement operations of adsorption units, low automation levels, and increased operating and maintenance costs and manual labor intensity. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage series filtration device for the adsorption treatment of perfluorinated compounds, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage series filtration device for the adsorption treatment of perfluorinated compounds, comprising a tank and multiple adsorption columns disposed within the tank, wherein the tank is in a partially annular shape; a piston is installed at the water inlet end of each adsorption column, the piston being sealed against the inner wall of the tank and having a water permeable hole in the middle of the piston; two connecting rods are fixedly connected between two adjacent pistons; a water inlet pipe and a water quality detector are installed on the tank; The tank body is symmetrically provided with rotating components on the front and rear sides. The rotating components are used to drive multiple pistons to rotate synchronously along the tank body axis. A switching assembly is provided above the tank body, and the switching assembly is used to replace the adsorption column located on the piston on the outside of the tank body. The tank body is equipped with a sealing component at one end near the water inlet pipe. The sealing component is used to ensure that the tank body on that side remains sealed while the rotating component drives the piston to move.

[0006] Preferably, the rotating assembly includes a frame, on which a rotating bracket is fixedly connected to the output shaft near the tank. Multiple push rods are slidably connected to the rotating bracket, the number of push rods being equal to the number of pistons, and the multiple push rods and pistons being arranged in a circumferential array. A driving assembly is provided on the rotating bracket, which is used to drive the push rods to engage with the pistons located on the outside of the tank.

[0007] Preferably, the drive assembly includes a spring sleeved on the push rod, one end of the spring being fixedly connected to the push rod and the other end being fixedly connected to the rotating frame; a push block is fixedly connected to the end of the push rod away from the tank; a guide ring is fixedly connected to the frame, and the push block is in contact with the guide ring.

[0008] Preferably, the distance between the portion of the guide ring projected in the front-rear direction of the tank and the tank body is greater than the distance between the remaining portion of the guide ring and the tank body.

[0009] Preferably, the sealing assembly includes a sealing tube fixedly connected to the tank body, the sealing tube being in communication with the tank body and having two sealing plates slidably connected to both ends of the sealing tube, the two sealing plates being symmetrically distributed and both sealing plates being sealed and fitted with the connecting rod; a bracket is fixedly connected to the sealing tube near the sealing plate, and two cylinders are fixedly connected to the bracket, the telescopic ends of the cylinders being fixedly connected to the sealing plates.

[0010] Preferably, the sealing pipe is located on the extension line of the tank body and is coaxial with the tank body, and the inner diameter of the sealing pipe is larger than the inner diameter of the tank body; a water pump is provided on the sealing pipe, and a water injection pipe and a water extraction pipe are installed on the water pump, and both the water injection pipe and the water extraction pipe are connected to the sealing pipe.

[0011] Preferably, the switching component includes a frame two, a slide rail fixedly connected to the frame two, a cylinder two fixedly connected inside the slide rail and a slider fixedly connected to the telescopic end of the cylinder two, a cylinder three fixedly connected to the slider, a motor fixedly connected to the bottom end of the cylinder three, and an electric clamp fixedly connected to the output shaft of the motor.

[0012] Preferably, the water inlet pipe is located on the tank body near the sealing pipe; the water inlet pipe is connected to the tank body.

[0013] Preferably, the water quality detector is positioned on the tank body after the first adsorption column along the direction of water flow inside the tank.

[0014] Preferably, the piston is fixedly connected to a plurality of snap-fit ​​chambers, and the adsorption column is fixedly connected to a plurality of snap-fit ​​blocks at the part that fits with the piston, and the snap-fit ​​blocks engage with the snap-fit ​​chambers.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a partially annular tank and multiple adsorption column units connected in series by linkages and capable of synchronous rotation. Combined with the dynamic sealing effect of a sealing assembly, when the first adsorption column becomes saturated, it can be moved out of the treatment station and replaced without stopping the system or interrupting water supply. Simultaneously, a new adsorption column is immediately connected to the system. This achieves continuous automated operation of the adsorption treatment process, significantly improving the treatment efficiency and stability of the device, and is particularly suitable for industrial scenarios requiring continuous discharge treatment.

[0016] This invention employs a multi-stage adsorption column series design, where water flows sequentially through multiple adsorption columns, forming a progressive deep adsorption purification path. This structure fully utilizes the adsorbent's capacity, effectively extending the overall breakthrough time, resulting in higher removal rates and more stable effluent quality for low-concentration perfluorinated compounds, ensuring wastewater treatment meets stringent discharge standards. Furthermore, the modular adsorption column units facilitate individual replacement and maintenance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention (where x, y, and z represent the front, right, and top directions, respectively). Figure 2 This is a schematic diagram of the rear view structure of the present invention; Figure 3 This is a schematic diagram of the disassembled structure of the present invention; Figure 4 This is a schematic diagram of the tank structure in this invention; Figure 5 This is a schematic cross-sectional view of the tank body in this invention; Figure 6 This is a schematic diagram of the piston structure in this invention; Figure 7 This is a schematic diagram of the adsorption column replacement process in this invention; Figure 8 This is a schematic diagram of the rotating assembly in this invention; Figure 9 This is a schematic diagram of the disassembled structure of the rotating component in this invention; Figure 10 This is a schematic diagram of the switching component in this invention.

[0018] The attached diagram lists the components represented by each number as follows: 1. Tank; 2. Adsorption column; 3. Piston; 4. Connecting rod; 5. Inlet pipe; 6. Water quality detector; 7. Frame 1; 8. Rotating frame 1; 9. Push rod; 10. Spring; 11. Push block; 12. Guide ring; 13. Sealing pipe; 14. Sealing plate; 15. Support; 16. Cylinder 1; 17. Water pump; 18. Water injection pipe; 19. Water extraction pipe; 20. Frame 2; 21. Slide rail; 22. Cylinder 2; 23. Slider; 24. Cylinder 3; 25. Motor; 26. Electric clamp; 27. Clip-on chamber; 28. Clip-on block. Detailed Implementation

[0019] Please see Figure 1-10 The present invention provides a technical solution: a multi-stage series filtration device for the adsorption treatment of perfluorinated compounds, comprising a tank 1 and multiple adsorption columns 2 disposed within the tank 1, the tank 1 being in a partially annular shape; a piston 3 is installed at the water inlet end of the adsorption column 2, the piston 3 being sealed and fitted to the inner wall of the tank 1, and a water permeable hole is provided in the middle of the piston 3; two connecting rods 4 are fixedly connected between two adjacent pistons 3; a water inlet pipe 5 and a water quality detector 6 are installed on the tank 1; Rotating components are symmetrically arranged on the front and rear sides of the tank body 1. The rotating components are used to drive multiple pistons 3 to rotate synchronously along the axis of the tank body 1. A switching assembly is provided above the tank body 1. The switching assembly is used to replace the adsorption column 2 located on the piston 3 on the outside of the tank body 1. A sealing assembly is provided at one end of the tank body 1 near the water inlet pipe 5. The sealing assembly is used to ensure that the part of the tank body 1 on that side remains sealed while the rotating assembly drives the piston 3 to move. During operation, wastewater containing perfluorinated compounds is injected into tank 1 through inlet pipe 5. The wastewater in tank 1 enters adsorption column 2 after passing through the water permeable hole in the middle of piston 3. As the wastewater passes through adsorption column 2, the adsorption column 2 absorbs most of the harmful perfluorinated compounds contained in it. After the wastewater passes through one piston 3 and one adsorption column 2, most of the harmful substances are removed. As the wastewater passes through multiple adsorption columns 2, it is discharged from tank 1. In this process, the series treatment of multi-stage adsorption columns 2 can ensure that the perfluorinated compounds in the wastewater are deeply removed and meet the discharge standards required for treatment. When the first adsorption column 2 in contact with the wastewater reaches saturation due to prolonged adsorption of harmful substances, it can no longer treat the wastewater. The wastewater passing through this adsorption column 2 contains a large amount of perfluorinated compounds. When this situation is detected by the water quality detector 6, the rotating assembly is activated, driving all pistons 3 to rotate clockwise simultaneously. The saturated adsorption column 2 then rotates clockwise and gradually exits the tank 1. During this process, the sealing assembly ensures that the water inlet of the tank 1 remains sealed, thereby maintaining a certain water pressure at the water inlet of the tank 1. This pressure is sufficient to force the water in the tank 1 to pass through multiple adsorption columns 2 and exit from the other end of the tank 1. As the rotating assembly drives the saturated adsorption column 2 to rotate out of the tank 1, the water inlet of the tank 1 remains sealed, allowing wastewater to be continuously injected into the tank 1. The other adsorption columns 2 can then continuously treat the wastewater. Once the adsorption column 2 is saturated and detaches from the tank 1, the adsorption column 2 can be replaced by switching components.

[0020] See Figure 2-3 , Figure 8-9 As a further embodiment of the present invention, the rotating assembly includes a frame 7, a rotating frame 8 is fixedly connected to the output shaft of the frame 7 near the tank 1, and a plurality of push rods 9 are slidably connected to the rotating frame 8. The number of push rods 9 is equal to the number of pistons 3, and the plurality of push rods 9 and pistons 3 are arranged in a circumferential array. The rotating frame 8 is provided with a driving assembly, which is used to drive the push rods 9 to engage with the pistons 3 located on the outside of the tank 1. The drive assembly includes a spring 10 sleeved on the push rod 9, one end of the spring 10 being fixedly connected to the push rod 9 and the other end being fixedly connected to the rotating frame 8; a push block 11 is fixedly connected to the end of the push rod 9 away from the tank 1; a guide ring 12 is fixedly connected to the frame 7, and the push block 11 is in contact with the guide ring 12. The distance between the portion of the guide ring 12 projected in the front-rear direction and the tank 1 is greater than the distance between the remaining portion of the guide ring 12 and the tank 1; During operation, when the adsorption column 2 needs to be replaced, the motors built into the front and rear frame 7 can be started to drive the rotating frame 8 to rotate. When the rotating frame 8 rotates, it drives the multiple push rods 9 connected to it to rotate. Among them, the push rod 9 that is in contact with the piston 3 on the outside of the tank 1 drives the piston 3 of that part to rotate along the axis of the tank 1 when it rotates. The piston 3 of that part can drive all the pistons 3 and the connecting rod 4 to rotate synchronously through the connecting rod 4, thereby driving the adsorption column 2 that needs to be replaced to rotate from inside the tank 1 to the outside of the tank 1. When the piston 3 just leaves the tank 1, the push block 11 on the corresponding push rod 9 just separates from the part of the guide ring 12 away from the tank 1. Under the action of the spring 10, the push rod 9 moves directly towards the piston 3 and fits against the piston 3. As the rotating frame 8 continues to rotate, it can drive the piston 3 to rotate along the axis of the tank 1. Meanwhile, the newly installed adsorption column 2 is pushed into the water outlet pipe inside the tank 1 by the push rod 9. When the piston 3 is about to be pushed into the tank 1 by the push rod 9, the push block 11 on the push rod 9 gradually drives the push rod 9 to separate from the piston 3 under the action of the guide ring 12, and the push block 11 gradually moves to the part of the guide ring 12 away from the tank 1.

[0021] See Figure 4-5 , Figure 7 As a further embodiment of the present invention, the sealing assembly includes a sealing tube 13 fixedly connected to the tank body 1. The sealing tube 13 is connected to the tank body 1 and two sealing plates 14 are slidably connected to both ends of the sealing tube 13. The two sealing plates 14 are symmetrically distributed and both sealing plates 14 are sealed and fitted to the connecting rod 4. A bracket 15 is fixedly connected to the sealing tube 13 near the sealing plate 14. Two cylinders 16 are fixedly connected to the bracket 15. The telescopic ends of the cylinders 16 are fixedly connected to the sealing plates 14. The sealing pipe 13 is located on the extension line of the tank body 1 and is coaxial with the tank body 1. The inner diameter of the sealing pipe 13 is larger than the inner diameter of the tank body 1. A water pump 17 is provided on the sealing pipe 13. A water injection pipe 18 and a water extraction pipe 19 are installed on the water pump 17. Both the water inlet pipe 5 and the water extraction pipe 19 are connected to the sealing pipe 13. During operation, when the adsorption column 2 needs to be replaced, first start the water pump 17 to fill the sealing pipe 13 with wastewater. After the sealing pipe 13 is filled with wastewater, start the cylinder 16 on the side of the sealing pipe 13 closest to the tank body 1 to open the sealing plate 14 on that side. At this time, the sealing pipe 13 is connected to the tank body 1. Since the sealing pipe 13 is also filled with wastewater, it can ensure that the water inlet end of the tank body 1 maintains a high water pressure. At this time, drive all the pistons 3 to rotate along the axis of the tank body 1. When the adsorption column 2 to be replaced and the piston 3 connected to it move into the sealing pipe 13, start the upper... The cylinder 16 closes the sealing plate 14 to isolate the sealing tube 13 from the tank 1. After the sealing tube 13 is isolated from the tank 1, the water pump 17 is started to pump away the wastewater in the sealing tube 13 to prevent wastewater leakage after the sealing plate 14 on the other side of the sealing tube 13 is opened. After the wastewater in the sealing tube 13 is pumped away, the cylinder 16 on the side of the sealing tube 13 away from the tank 1 is started to open the sealing plate 14 on that side. Then all the pistons 3 are driven to rotate along the axis of the tank 1 again. At this time, the piston 3 can drive the adsorption column 2, which is saturated with adsorption, to move out of the sealing tube 13.

[0022] See Figure 2-3 , Figure 10As a further embodiment of the present invention, the switching component includes a frame 20, a slide rail 21 fixedly connected to the frame 20, a cylinder 22 fixedly connected inside the slide rail 21, and a slider 23 fixedly connected to the telescopic end of the cylinder 22, a cylinder 3 24 fixedly connected to the slider 23, a motor 25 fixedly connected to the bottom end of the cylinder 3 24, and an electric clamp 26 fixedly connected to the output shaft of the motor 25. Multiple snap-fit ​​chambers 27 are fixedly connected to the piston 3, and multiple snap-fit ​​blocks 28 are fixedly connected to the adsorption column 2 at the part that is in contact with the piston 3. The snap-fit ​​blocks 28 are snap-fitted into the snap-fit ​​chambers 27. During operation, when the saturated adsorption column 2 moves to the outside of the tank 1, cylinder 24 is activated to drive motor 25 and electric clamp 26 to move downwards. When electric clamp 26 moves to the position where it docks with the saturated adsorption column 2, it clamps the column and motor 25 is activated to rotate the electric clamp 26. The electric clamp 26 then drives the adsorption column 2 to rotate. When the adsorption column 2 rotates, it causes multiple locking blocks 28 to disengage from multiple locking chambers 27 on piston 3. At this time, cylinder 22 is activated to drive slider 23 to slide. Slider 23, through cylinder 24, drives electric clamp 26 and adsorption column 2 to move and disengage from piston 3. Then, a new adsorption column 2 can be installed.

[0023] See Figure 1 , Figure 7 As a further embodiment of the present invention, the water inlet pipe 5 is disposed on the tank body 1 near the sealing pipe 13; the water inlet pipe 5 is connected to the tank body 1; The water quality detector 6 is positioned on the tank 1 after the first adsorption column 2 along the direction of water flow inside the tank 1; During operation, wastewater is injected into tank 1 through inlet pipe 5. Under water pressure, the wastewater passes through first piston 3 and adsorption column 2. After adsorption by first adsorption column 2, most of the perfluorinated compounds in the wastewater are removed. At this time, the adsorption effect of first adsorption column 2 can be detected by water quality detector 6. When the water quality detector 6 detects that the wastewater after passing through the first adsorption column 2 contains a large amount of perfluorinated compounds, it indicates that the first adsorption column 2 is saturated.

Claims

1. A multi-stage series filtration device for the adsorption treatment of perfluorinated compounds, comprising a tank (1) and a plurality of adsorption columns (2) disposed within the tank (1), characterized in that: The tank (1) is incompletely annular in shape; a piston (3) is installed at the water inlet end of the adsorption column (2), the piston (3) is sealed and fitted to the inner wall of the tank (1), and a water permeable hole is opened in the middle of the piston (3); two connecting rods (4) are fixedly connected between two adjacent pistons (3); a water inlet pipe (5) and a water quality detector (6) are installed on the tank (1). The tank (1) is symmetrically provided with rotating components on the front and rear sides. The rotating components are used to drive multiple pistons (3) to rotate synchronously along the axis of the tank (1). A switching assembly is provided above the tank (1), and the switching assembly is used to replace the adsorption column (2) located on the piston (3) on the outside of the tank (1). The tank (1) is provided with a sealing assembly at one end near the water inlet pipe (5). The sealing assembly is used to ensure that the part of the tank (1) remains sealed while the rotating assembly drives the piston (3) to move.

2. The multi-stage series filtration device for adsorption treatment of perfluorinated compounds according to claim 1, characterized in that: The rotating assembly includes a frame (7), on which a rotating frame (8) is fixedly connected to the output shaft near the tank (1). Multiple push rods (9) are slidably connected to the rotating frame (8). The number of push rods (9) is equal to the number of pistons (3), and the multiple push rods (9) and pistons (3) are arranged in a circular array. A driving assembly is provided on the rotating frame (8), which is used to drive the push rods (9) to fit against the pistons (3) located outside the tank (1).

3. The multi-stage series filtration device for adsorption treatment of perfluorinated compounds according to claim 2, characterized in that: The drive assembly includes a spring (10) sleeved on the push rod (9), one end of the spring (10) being fixedly connected to the push rod (9) and the other end being fixedly connected to the rotating frame (8); a push block (11) is fixedly connected to the end of the push rod (9) away from the tank (1); a guide ring (12) is fixedly connected to the frame (7), and the push block (11) is in contact with the guide ring (12).

4. The multi-stage series filtration device for adsorption treatment of perfluorinated compounds according to claim 3, characterized in that: The distance between the portion of the guide ring (12) projected in the front-rear direction of the tank (1) and the tank (1) is greater than the distance between the remaining portion of the guide ring (12) and the tank (1).

5. The multi-stage series filtration device for adsorption treatment of perfluorinated compounds according to claim 1, characterized in that: The sealing assembly includes a sealing tube (13) fixedly connected to the tank body (1). The sealing tube (13) is connected to the tank body (1) and two sealing plates (14) are slidably connected to both ends of the sealing tube (13). The two sealing plates (14) are symmetrically distributed and both sealing plates (14) are sealed and fitted to the connecting rod (4). A bracket (15) is fixedly connected to the sealing tube (13) near the sealing plate (14). Two cylinders (16) are fixedly connected to the bracket (15). The telescopic end of the cylinder (16) is fixedly connected to the sealing plate (14).

6. The multi-stage series filtration device for adsorption treatment of perfluorinated compounds according to claim 5, characterized in that: The sealing pipe (13) is located on the extension line of the tank body (1) and is coaxial with the tank body (1). The inner diameter of the sealing pipe (13) is larger than the inner diameter of the tank body (1). A water pump (17) is provided on the sealing pipe (13). A water injection pipe (18) and a water extraction pipe (19) are installed on the water pump (17). The water inlet pipe (5) and the water extraction pipe (19) are both connected to the sealing pipe (13).

7. The multi-stage series filtration device for adsorption treatment of perfluorinated compounds according to claim 1, characterized in that: The switching assembly includes a frame two (20), on which a slide rail (21) is fixedly connected. A cylinder two (22) is fixedly connected inside the slide rail (21), and a slider (23) is fixedly connected to the telescopic end of the cylinder two (22). A cylinder three (24) is fixedly connected to the slider (23), and a motor (25) is fixedly connected to the bottom end of the cylinder three (24). An electric clamp (26) is fixedly connected to the output shaft of the motor (25).

8. The multi-stage series filtration device for adsorption treatment of perfluorinated compounds according to claim 5, characterized in that: The water inlet pipe (5) is located on the tank body (1) near the sealing pipe (13); the water inlet pipe (5) is connected to the tank body (1).

9. The multi-stage series filtration device for adsorption treatment of perfluorinated compounds according to claim 1, characterized in that: The water quality detector (6) is positioned on the tank (1) after the first adsorption column (2) along the direction of water flow inside the tank (1).

10. The multi-stage series filtration device for adsorption treatment of perfluorinated compounds according to claim 1, characterized in that: Multiple snap-fit ​​chambers (27) are fixedly connected to the piston (3), and multiple snap-fit ​​blocks (28) are fixedly connected to the adsorption column (2) at the part that fits with the piston (3). The snap-fit ​​blocks (28) engage with the snap-fit ​​chambers (27).

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