A high efficiency sedimentation tank

Abstract

The utility model discloses a kind of efficient sedimentation tanks, including at least one sedimentation tank main body, coagulation section, I section reaction pool, II section reaction pool, III section reaction pool, steady flow section, sedimentation section are sequentially arranged in the sedimentation tank main body, the water inlet portion that coagulation section is communicated is provided in the sedimentation tank main body, water collecting and draining portion is connected in the rear end of the sedimentation section;Coagulation device is provided in the coagulation section, grid flocculator is built-in at least one in I section reaction pool, II section reaction pool, III section reaction pool, variable-angle sedimentation device is provided in the sedimentation section, the coagulation device of the application adopts square frame body, covers entire water flow section, fully increase the contact of reagent and water, mixed more evenly, beneficial to form flocculation body;Grid flocculator adopts bucket-shaped grid plate, and further improve the sedimentation effect.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a high-efficiency sedimentation tank. Background Technology

[0002] Coagulation and sedimentation processes are commonly used in wastewater treatment, both as pretreatment and as advanced treatment stages after secondary treatment. Their purpose is to remove suspended solids from water and enhance the removal of total phosphorus and other pollutants. Specifically, it includes two stages: coagulation and sedimentation. Coagulation involves adding a coagulant, utilizing its electrolyte properties to form flocs in the wastewater. These flocs neutralize the charge of colloidal substances, leading to the settling of granules. This process causes colloids and fine suspended solids in the wastewater to aggregate into flocs. Sedimentation, on the other hand, involves separating these aggregated particles from the water by gravity. This is typically done using equipment such as sedimentation tanks, allowing suspended and dissolved substances to settle to the bottom, forming a sediment layer. Therefore, both coagulation and sedimentation are crucial processes in the coagulation and sedimentation process.

[0003] Currently, domestic wastewater treatment plants have high discharge standards, generally requiring Class A or near-Class IV standards. Therefore, in order to ensure that the total phosphorus and suspended solids in the effluent meet the standards, high-efficiency sedimentation tank technology is generally used in the deep treatment process. However, the existing sedimentation tanks have poor sedimentation effects and cannot meet the treatment standards. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency sedimentation tank to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A high-efficiency sedimentation tank includes at least one sedimentation tank body, wherein a coagulation section, a first-stage reaction tank, a second-stage reaction tank, a third-stage reaction tank, a flow stabilization section, and a sedimentation section are sequentially arranged inside the sedimentation tank body. An inlet section communicating with the coagulation section is provided outside the sedimentation tank body, and a water collection and drainage section is connected to the rear end of the sedimentation section. The coagulation section is equipped with a coagulation device, and at least one of the reaction tanks I, II, and III is equipped with a grid flocculation device. The sedimentation section is equipped with a variable angle sedimentation device.

[0006] As a further embodiment of this utility model: the water inlet section includes a main water inlet pipe and at least one water inlet pipe connected to the main water inlet pipe, the water inlet pipe is provided with a pipe mixer, and the water inlet pipe is connected to the condensation section.

[0007] As a further embodiment of this utility model: the coagulation device is a square frame structure, the coagulation device covers the entire flow cross section, and the coagulation device is equipped with flocculation packing.

[0008] As a further embodiment of this utility model: both the first-stage reaction tank and the second-stage reaction tank are equipped with a grid flocculation device, wherein the grid flocculation device is a bucket-shaped grid plate structure, and the bucket-shaped grid plate is provided with multiple holes.

[0009] As a further embodiment of this utility model: flow passages are provided at the connection points between the first-stage reaction tank and the second-stage reaction tank, and between the second-stage reaction tank and the third-stage reaction tank, with the flow passages alternating between the upper and lower sections.

[0010] As a further embodiment of this utility model: a flow stabilizing device is provided in the flow stabilizing section, and the flow stabilizing device is an inclined baffle installed in the flow stabilizing section.

[0011] As a further embodiment of this utility model: a water distribution section is provided between the flow stabilization section and the sedimentation section, the water distribution section includes a water distribution device, the flow stabilization section and the water distribution device are connected through a flow passage, the water distribution device is an elongated baffle with evenly spaced holes.

[0012] As a further embodiment of this utility model: the variable angle sedimentation device includes multiple corner sections, the multiple corner sections are arranged in parallel, a sludge discharge channel is provided on both sides of the corner section, a horizontal pipe is provided between the two sludge discharge channels, and the horizontal pipe between the two sludge discharge channels is inclined downward at its middle end to form a horizontal pipe variable angle slide.

[0013] As a further embodiment of this utility model: a backwashing section is provided in the sedimentation section, the backwashing section includes a mobile gantry arranged on both sides of the variable angle sedimentation device, a backwash water tank is provided at the upper end of the mobile gantry, the backwash water tank is connected to a backwash water pump, flushing nozzles are provided on both sides of the variable angle sedimentation device, the flushing nozzles are connected to the outlet of the backwash water pump, the backwash water pump is movably connected to the mobile gantry through a self-coupling lifting system, the self-coupling lifting system includes a counterweight block located on the mobile gantry, the counterweight block is connected to the backwash water pump through a fixed pulley group.

[0014] As a further embodiment of this utility model: the water collection and drainage section includes a water collection device and a drainage device. The water collection device adopts a porous water collection plate, and the drainage device includes a drainage inlet pipe and a water outlet weir. The water outlet weir is located at the upper part of the drainage inlet pipe, and a water inlet hole is provided at the lower part of the drainage inlet pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. The coagulation device of this application adopts a square frame that covers the entire flow section. The interior is filled with Pall ring packing or other packing to fully increase the contact between the reagent and the water, making the mixing more uniform and conducive to the formation of flocs. The grid flocculation device of this application adopts a bucket-shaped grid plate. By changing the holes and number of the grid plate, the average velocity gradient G and GT values ​​of the flocculation tank are ensured to meet the requirements of relevant specifications, thus achieving the flocculation effect and improving the sedimentation effect.

[0016] 2. This application adopts a variable angle sedimentation device. The horizontal pipe between the two rows of sludge channels is inclined downward at the middle end, making the slide steeper. By changing the end angle, the sludge enters the slide faster, thereby ensuring the rapid settling of the sludge, improving the sedimentation efficiency of the horizontal pipe sedimentation tank, reducing the SS and turbidity of the effluent, and reducing the backwashing frequency of the horizontal pipe sedimentation tank.

[0017] 3. The water collection device of this application uses a perforated plate for water collection, which results in more uniform water collection, stable flow rate, and ensures that the suspended solids (SS) of the collected water remains unchanged. The drainage device uses a perforated pipe for collection and an outlet weir for water discharge, ensuring that the discharged water does not carry away floating debris from the water surface and ensuring the quality of the discharged water.

[0018] 4. This application adopts an automatic backwashing system. A backwashing water pump is placed on one side and equipped with a self-coupling lifting system to ensure convenient maintenance if the backwashing water pump malfunctions. A backwashing counterweight system is adopted on the other side to ensure that the weight on both sides of the gantry crane is consistent. This can ensure the stable operation of the gantry crane and more uniform backwashing horizontal pipe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure in this embodiment; Figure 2 This is a schematic diagram showing the unfolded structure of this embodiment; Figure 3 This is a schematic diagram of the grid flocculation device in this embodiment; Figure 4 This is a schematic diagram of the water distribution device in this embodiment; Figure 5 This is a schematic diagram of the backwashing system in this embodiment; Figure 6 , Figure 7 This is a schematic diagram of the variable angle sedimentation device in this embodiment; Figure 8 This is a schematic diagram of the drainage device in this embodiment; In the diagram: 1-coagulation section, 2-Section I reaction tank, 3-Section II reaction tank, 4-Section III reaction tank, 5-stabilizing flow section, 6-sedimentation section, 7-water collection and drainage section, 8-inlet pipe, 9-main inlet pipe, 10-pipe mixer, 11-flow hole, 12-coagulation device, 13-grid flocculation device, 14-stabilizing flow device, 15-water distribution device, 16-variable angle sedimentation device, 17-water collection device, 18-drainage device, 19-backwash water tank, 20-counterweight, 21-rinsing nozzle, 22-mobile gantry, 23-backwash water pump, 24-sludge discharge channel, 25-horizontal pipe variable angle slide, 26-drainage device inlet pipe, 27-outlet weir. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-8 In this embodiment of the present invention, a high-efficiency sedimentation tank includes at least one sedimentation tank body. Within the sedimentation tank body, a coagulation section 1, a first-stage reaction tank 2, a second-stage reaction tank 3, a third-stage reaction tank 4, a flow stabilization section 5, and a sedimentation section 6 are sequentially arranged. An inlet connected to the coagulation section 1 is provided outside the sedimentation tank body, and a water collection and drainage section is connected to the rear end of the sedimentation section 6. A coagulation device 12 is provided within the coagulation section 1. At least one of the first-stage reaction tanks 2, second-stage reaction tank 3, and third-stage reaction tank 4 has a built-in grid flocculation device 13, and a variable-angle sedimentation device 16 is provided within the sedimentation section 6.

[0022] The water inlet section includes a main water inlet pipe 9 and at least one water inlet pipe 8 connected to the main water inlet pipe. A pipe mixer 10 is installed on the water inlet pipe 8. The pipe mixer is used to add flocculant. The water inlet pipe 8 is connected to the coagulation section 1.

[0023] The coagulation device 12 has a square frame structure and covers the entire flow cross section. The coagulation device 12 is equipped with flocculation packing. In this embodiment, the interior is filled with Pall ring packing or other packing to fully increase the contact between the agent and the water, making the mixing more uniform and conducive to the formation of flocs.

[0024] Flow holes 11 are provided at the connection points between stage I reaction tank 2 and stage II reaction tank 3, and between stage II reaction tank 3 and stage III reaction tank 4. These flow holes 11 are alternately arranged vertically. Both stage I reaction tank 2 and stage II reaction tank 3 are equipped with a grid flocculation device 13, which is a funnel-shaped grid plate structure with multiple holes. In this embodiment, the grid flocculation device 13 uses a funnel-shaped grid plate. By changing the number and size of the holes in the grid plate, the average velocity gradient G and GT values ​​of the flocculation tank are ensured to meet the requirements of relevant specifications, thus achieving the desired flocculation effect. Stage II reaction tank 3 is equipped with the same grid flocculation device 13 as stage I reaction tank 2. The grid flocculation device 13 also uses a funnel-shaped grid plate. By changing the number and size of the holes in the grid plate, the average velocity gradient G and GT values ​​of the flocculation tank are ensured to meet the requirements of relevant specifications. Whether stage III reaction tank 4 is equipped with a grid flocculation device 13 needs to be determined based on the calculated average velocity gradient G and GT values ​​to ensure the desired flocculation effect.

[0025] A flow stabilizing device 14 is installed in the flow stabilizing section 5. The flow stabilizing device 14 is an inclined baffle installed in the flow stabilizing section 5. The inclined baffle is used to slow down the water flow speed and control the direction of the water flow. A water distribution device 15 is installed in the water distribution section. The elongated baffle has evenly spaced holes. A water baffle plate with a certain distance and slightly wider than the holes is set at the front end of the elongated baffle. This can further reduce the speed of the water flow and ensure that the water can flow into the sedimentation zone evenly and at a constant speed.

[0026] As a further embodiment of this utility model: a water distribution section is provided between the flow stabilizing section 5 and the sedimentation section 6. The water distribution section includes a water distribution device 15. The flow stabilizing section 5 and the water distribution device are connected through a flow passage 11. The water distribution device 15 is an elongated baffle with evenly spaced holes.

[0027] The variable-angle sedimentation device includes multiple corner sections arranged in parallel. Sludge discharge channels 4 are located on both sides of each corner section, and a horizontal pipe is installed between the two sludge discharge channels 4. The horizontal pipe between the two sludge discharge channels slopes downwards at its middle end, forming a variable-angle slide 25. Water flows into a single variable-angle sedimentation device section, utilizing the shallow pool theory to allow the sludge to settle rapidly. The variable-angle sedimentation device consists of variable-angle sections and sludge discharge channels. Each set of sections is arranged in parallel, and the horizontal pipe between two sludge discharge channels slopes downwards at its middle end, making the slide steeper and accelerating the sludge entry into the slide, thus ensuring rapid sludge settling. Based on practical experience, a 60° inclination angle for the sludge discharge slide yields the best sludge discharge effect.

[0028] A backwashing section is provided within the sedimentation section 6. The backwashing section includes mobile gantry cranes 7 arranged on both sides of the variable-angle sedimentation device 16. A backwash water tank 19 is mounted on the upper end of the mobile gantry crane 7, and the backwash water tank 19 is connected to a backwash water pump 23. Flushing nozzles 21 are provided on both sides of the variable-angle sedimentation device 16, and the flushing nozzles 21 are connected to the outlet of the backwash water pump 23. The backwash water pump 23 is movably connected to the mobile gantry crane 7 via a self-coupling lifting system. The self-coupling lifting system includes a counterweight 20 located on the mobile gantry crane 7, and the counterweight 20 is connected to the backwash water pump 23 via a fixed pulley system. In this embodiment, the automatic backwashing system uses a gantry crane-type backwashing system. A backwash water pump and a self-coupling lifting system are provided on one side, and a backwash water tank is provided on the upper part. A counterweight is provided on the other side, and the counterweight is placed in the middle of the frame to ensure stable operation and prevent shaking. The backwashing system uses a pulse flushing method.

[0029] The water collection and drainage section includes a water collection device 17 and a drainage device 18. The water collection device 17 uses a perforated water collection plate. The perforated plate has evenly spaced holes, resulting in more uniform water collection, stable flow rate, and ensuring that the suspended solids (SS) of the collected water remain unchanged. The drainage device 18 includes a drainage inlet pipe 26 and an outlet weir 27. The outlet weir 27 is located above the drainage inlet pipe 26. The drainage inlet pipe 26 has inlet holes at its lower part. The evenly spaced holes along the inlet pipe ensure that the outgoing water does not carry away floating debris from the water surface, thus ensuring the quality of the outgoing water.

[0030] The main body of the sedimentation tank also includes a sludge discharge system, which includes trapezoidal sludge hoppers. Sludge discharge pipes are placed in the trapezoidal sludge hoppers. The sludge discharge hoppers are set on both sides of the main body of the sedimentation tank to discharge sludge at multiple points. Sludge is discharged intermittently during operation.

[0031] In this embodiment, wastewater enters the inlet pipe 8 through the main inlet pipe 9. A pipe mixer 10 installed on the inlet pipe 8 is used to add flocculant. The wastewater then enters the main body of the sedimentation tank through the inlet pipe 8, and then enters the coagulation device 12 inside the coagulation section 1. The coagulation device 12 covers the entire flow cross-section and is filled with Pall ring packing or other packing to fully increase the contact between the agent and the water, resulting in more uniform mixing and facilitating floc formation. The water flows through the flow holes 11 into the first-stage reaction tank 2, the second-stage reaction tank 3, and the third-stage reaction tank 4. The first-stage reaction tank 2 and the second-stage reaction tank 3... The system is equipped with a grid flocculation device 13, which uses a bucket-shaped grid plate. By changing the number and size of the grid holes, the average velocity gradient G and GT values ​​of the flocculation tank are ensured to meet the requirements of relevant specifications, thus achieving the desired flocculation effect. Water flows through the flow passage 11 into the flow stabilization section 5, where the flow velocity is slowed down and the direction of flow is controlled by the flow stabilization device 14. The water then flows evenly and at a constant speed into the sedimentation section 6 through the uniform openings on the water distribution device 15, and stops at the variable angle sedimentation device 16. Sludge settles rapidly through the horizontal pipe variable angle slide 25 and flows into the sludge discharge channel 24. When the variable angle sedimentation device 16 needs cleaning, backwashing is activated. The supernatant after sedimentation is evenly collected by the water collection device, with a stable flow rate to ensure that the suspended solids (SS) of the collected water does not change. After passing through the water collection device, the water enters the inlet pipe of the drainage device. The inlet pipe has downward openings, and the water flows through the pipe into the outlet weir, and finally is discharged from the main body of the sedimentation tank. Meanwhile, the sludge enters the sludge discharge hopper of the sludge discharge system and is discharged externally through the sludge discharge pipe. The sludge discharge hopper is set on both sides of the main body of the sedimentation tank to discharge sludge at multiple points. During operation, sludge is discharged intermittently.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-efficiency sedimentation tank, characterized in that, It includes at least one sedimentation tank body, and the sedimentation tank body is provided with a coagulation section (1), a first-stage reaction tank (2), a second-stage reaction tank (3), a third-stage reaction tank (4), a flow stabilization section (5), and a sedimentation section (6) in sequence. The sedimentation tank body is provided with an inlet section that communicates with the coagulation section (1) and the sedimentation section (6) is connected to a water collection and drainage section at its rear end. The coagulation section (1) is equipped with a coagulation device (12), and at least one of the first-stage reaction tank (2), second-stage reaction tank (3), and third-stage reaction tank (4) is equipped with a grid flocculation device (13). The sedimentation section (6) is equipped with a variable angle sedimentation device (16).

2. The high-efficiency sedimentation tank according to claim 1, characterized in that, The water inlet section includes a main water inlet pipe (9) and at least one water inlet pipe (8) connected to the main water inlet pipe. A pipe mixer (10) is provided on the water inlet pipe (8), and the water inlet pipe (8) is connected to the condensation section (1).

3. The high-efficiency sedimentation tank according to claim 1, characterized in that, The coagulation device (12) is a square frame structure, covering the entire flow section, and is equipped with flocculation packing inside.

4. The high-efficiency sedimentation tank according to claim 1, characterized in that, Both the first-stage reaction tank (2) and the second-stage reaction tank (3) are equipped with a grid flocculation device (13). The grid flocculation device (13) is a bucket-shaped grid plate structure with multiple holes on the bucket-shaped grid plate.

5. The high-efficiency sedimentation tank according to claim 1, characterized in that, The connection between the first stage reaction tank (2) and the second stage reaction tank (3), and between the second stage reaction tank (3) and the third stage reaction tank (4) are all provided with flow holes (11), and the flow holes (11) are arranged alternately up and down.

6. The high-efficiency sedimentation tank according to claim 1, characterized in that, A flow stabilizing device (14) is provided in the flow stabilizing section (5), and the flow stabilizing device (14) is an inclined baffle provided in the flow stabilizing section (5).

7. The high-efficiency sedimentation tank according to claim 1, characterized in that, A water distribution section is provided between the flow stabilization section (5) and the sedimentation section (6). The water distribution section includes a water distribution device (15). The flow stabilization section (5) and the water distribution device are connected through a flow passage (11). The water distribution device (15) is an elongated baffle with uniformly spaced holes.

8. The high-efficiency sedimentation tank according to claim 1, characterized in that, The variable angle sedimentation device includes multiple corner sections, which are arranged in parallel. A sludge discharge channel (4) is provided on both sides of the corner section. A horizontal pipe is provided between the two sludge discharge channels (4). The horizontal pipe between the two sludge discharge channels is inclined downward at its middle end to form a horizontal pipe variable angle slide (25).

9. A high-efficiency sedimentation tank according to claim 1, characterized in that, The sedimentation section (6) is equipped with a backwashing unit, which includes a mobile gantry (7) arranged on both sides of the variable angle sedimentation device (16). The upper end of the mobile gantry (7) is equipped with a backwash water tank (19), which is connected to a backwash water pump (23). Both sides of the variable angle sedimentation device (16) are equipped with flushing nozzles (21), which are connected to the outlet of the backwash water pump (23). The backwash water pump (23) is movably connected to the mobile gantry (7) through a self-coupling lifting system. The self-coupling lifting system includes a counterweight (20) located on the mobile gantry (7), which is connected to the backwash water pump (23) through a fixed pulley system.

10. A high-efficiency sedimentation tank according to claim 1, characterized in that, The water collection and drainage section includes a water collection device (17) and a drainage device (18). The water collection device (17) adopts a porous water collection plate. The drainage device (18) includes a drainage inlet pipe (26) and an outlet weir (27). The outlet weir (27) is located at the upper part of the drainage inlet pipe (26). The lower part of the drainage inlet pipe (26) is provided with an inlet hole.

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