A structure for a chemical wastewater flocculation sedimentation separation tank

Abstract

This utility model discloses a flocculation sedimentation separation tank structure for chemical wastewater, belonging to the field of industrial wastewater treatment technology. The structure includes an interconnected flocculation tank and a sedimentation tank. The flocculation tank has an inlet, and the sedimentation tank has an outlet. Several sludge hoppers are sequentially arranged at the bottom of the sedimentation tank along the water flow direction. Each sludge hopper contains a moving component for transferring sludge to the next sludge hopper. The moving component includes a rotatable cylinder and a driving component that drives its rotation. A scraper is detachably connected circumferentially to the cylinder. This structure improves sedimentation efficiency through inclined plates and transfers sludge step-by-step through the moving component, preventing sludge accumulation and blockage, improving the continuity of wastewater discharge and the utilization rate of the tank. It is suitable for stable and efficient chemical wastewater treatment scenarios.

Description

Technical Field

[0001] This utility model relates to the field of industrial wastewater treatment technology, specifically to a structure for a chemical wastewater flocculation sedimentation separation tank. Background Technology

[0002] Chemical wastewater often contains a large number of suspended particles, organic colloids, and fine impurities. These tiny particles are difficult to settle quickly during conventional gravity sedimentation, directly affecting the clarity of the effluent and treatment efficiency. To improve treatment speed and effectiveness, the industry commonly adopts a process combining flocculation and sedimentation: First, flocculants are added to the flocculation tank, causing the fine particles in the wastewater to rapidly aggregate into settleable flocs through chemical action; then, the wastewater enters the sedimentation tank, where hydraulic conditions and gravity cause the flocs to settle and separate, with the clear water discharged from the top and the sludge collected at the bottom and periodically discharged.

[0003] According to shallow sedimentation theory, under the same treatment capacity, the efficiency of a sedimentation tank is closely related to the effective sedimentation area and water depth: the shallower the tank and the larger the area, the shorter the particle settling distance and the faster the sedimentation speed. Inclined plate sedimentation tanks, by installing inclined plates or tubes at a certain angle within the tank, further shorten the settling distance and increase the actual sedimentation area, thereby improving treatment efficiency and effluent quality. To achieve higher sedimentation efficiency, some designs install multiple sludge hoppers at the bottom of horizontal flow sedimentation tanks or inclined plate tanks, dividing the sedimentation tank into multiple small units along the flow direction for convenient localized centralized sludge discharge. However, when the flow rate of chemical wastewater is low or the sludge content is high, the upstream sludge hoppers will accumulate most of the sludge first, resulting in excessively thick sludge buildup, which can easily clog the discharge outlet and increase maintenance costs. Meanwhile, the sludge in the sludge hoppers further away has less sludge, leading to underutilization of resources and a decrease in the overall sludge-water separation efficiency and tank utilization rate of the system.

[0004] Therefore, there is an urgent need to design a flocculation sedimentation separation tank structure for chemical wastewater that can meet the current continuous treatment needs of chemical wastewater. Utility Model Content

[0005] The purpose of this utility model is to provide a structure for a flocculation sedimentation separation tank for chemical wastewater. This structure can effectively improve the settling efficiency of suspended particles in wastewater, avoid sludge accumulation and blockage at the front end of the sedimentation tank, and improve the continuity and uniformity of sludge transportation and discharge, thereby achieving efficient and stable chemical wastewater treatment.

[0006] The technical solution adopted by this utility model to solve the above problems is: a chemical wastewater flocculation sedimentation separation tank structure, including a flocculation tank and a sedimentation tank that are interconnected. The flocculation tank is provided with an inlet, and the sedimentation tank is provided with an outlet. Several sludge hoppers are arranged sequentially along the water flow direction at the bottom of the sedimentation tank. A moving component is provided in the sludge hopper for moving the sludge to the next sludge hopper.

[0007] Preferably, the actuating assembly includes a rotatable cylinder mounted in the sedimentation tank and a driving component that drives the cylinder to rotate. The cylinder is detachably connected to a scraper in the circumferential direction.

[0008] Preferably, the paddle cylinder is provided with a mounting part in the circumferential direction, and the mounting part is connected and fixed to the scraper by threaded fasteners.

[0009] Preferably, the mounting part includes two sets of clamping plates, and the scraper includes a fixing part and a curved part, wherein the fixing part is adapted to the clamping groove formed between the two sets of clamping plates.

[0010] Preferably, the threaded fastener comprises several sets of bolts and nuts, the clamping plate has elongated holes, the fixing part has round holes, and the fixing part is inserted between two sets of clamping plates.

[0011] Preferably, the driving component is a hydraulic motor.

[0012] Preferably, the sludge hopper is provided with a sewage outlet at the bottom, and the sedimentation tank is provided with a sewage pipe below it, with all sewage outlets connected to the sewage pipe.

[0013] Preferably, the sludge hopper is provided with a flushing port on its side.

[0014] Preferably, the flocculation tank is equipped with a baffle plate, which divides the flocculation tank into an inlet zone and an outlet zone. The inlet is located on one side of the inlet zone, and a notch is provided at the bottom of the baffle plate. The outlet zone is connected to the bottom of the sedimentation tank via a pipe on the side wall near the top.

[0015] Compared with the prior art, this utility model has the following advantages and effects:

[0016] This invention increases the effective sedimentation area and shortens the settling path of suspended particles by installing inclined plates inside the sedimentation tank, thereby improving the sedimentation rate and effluent clarity. A multi-stage sludge hopper is configured at the bottom of the sedimentation tank, and sludge is transferred stage by stage via a toggle mechanism. This effectively prevents premature clogging of the front sludge hopper due to concentrated sludge, while ensuring full utilization of the rear sludge hopper, thus improving overall sludge discharge efficiency and tank utilization. Attached Figure Description

[0017] Figure 1 and Figure 2 This is a perspective view of the structure of a chemical wastewater flocculation sedimentation separation tank according to an embodiment of this utility model.

[0018] Figure 3 This is a cross-sectional view of the structure of a chemical wastewater flocculation sedimentation separation tank according to an embodiment of this utility model.

[0019] Figure 4 yes Figure 3 The cross-sectional view marked AA.

[0020] Figure 5 yes Figure 3 The cross-sectional view marked BB.

[0021] Figure 6 This is a schematic diagram of the structure of the toggle assembly according to an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the connection structure between the scraper and the mounting part in an embodiment of this utility model.

[0023] Figure numbers: Flocculation tank 11, sedimentation tank 12, inlet 13, outlet 14, sludge hopper 15, actuating assembly 16, overflow weir 21, inclined plate 22, actuating cylinder 23, driving component 24, scraper 25, mounting part 31, threaded fastener 32, clamping plate 33, fixing part 34, curved part 35, clamping groove 36, elongated hole 37, round hole 38, sewage outlet 41, sewage pipe 42, short pipe section 43, check valve 44, flushing port 45, nozzle 46, baffle 51, inlet area 52, outlet area 53, notch 54, pipeline 55. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0025] Example:

[0026] See Figures 1-7 In this embodiment, a chemical wastewater flocculation sedimentation separation tank structure is disclosed, which is specifically used for the pretreatment of chemical wastewater containing high concentrations of suspended particles and organic colloids. Specifically, it includes a flocculation tank 11 and a sedimentation tank 12 that are interconnected. The flocculation tank 11 is provided with an inlet 13, and the sedimentation tank 12 is provided with an outlet 14. Several sludge hoppers 15 are arranged sequentially at the bottom of the sedimentation tank 12 along the water flow direction. Each sludge hopper 15 is provided with a moving component 16 for moving sludge to the next sludge hopper 15.

[0027] Specifically, in this embodiment, wastewater enters the flocculation tank 11 through the inlet 13. Flocculant is injected into the flocculation tank 11 and mixed with the wastewater before flowing into the sedimentation tank 12. The sedimentation tank 12 in this embodiment is equipped with an inclined plate 22 (or an inclined tube, etc.). The inclined plate 22 is typically installed at a certain angle (generally 45°-60°) to the horizontal plane to increase the sedimentation area and thus improve sedimentation efficiency. The inclined plate 22 can be made of materials such as polypropylene or fiberglass, and its shape can be flat or honeycomb structure. The water after sedimentation treatment is discharged from the outlet 14 of the sedimentation tank 12. The sedimentation tank 12 uses an overflow weir 21 for water discharge (an overflow weir 21 is provided on the side of the sedimentation tank 12 near the outlet 14) to ensure uniform and stable effluent. In this embodiment, a multi-stage sludge hopper 15 is used in conjunction with a toggle assembly 16 for sewage discharge. The toggle assembly 16 transfers the sludge in the upstream sludge hopper 15 to the downstream sludge hopper 15 in sequence, so that the sludge is evenly distributed. The upstream sludge hopper 15 will not be over-accumulated and cause blockage, and the downstream sludge hopper 15 can also be fully utilized to improve the overall sewage discharge efficiency.

[0028] See Figure 6 The actuating assembly 16 includes an actuating cylinder 23 rotatably mounted on the sedimentation tank 12 and a driving component 24 for driving its rotation. Scrapers 25 are detachably connected to the actuating cylinder 23 circumferentially. The actuating cylinder 23 is a hollow cylinder, with both ends fixed to the side wall of the sedimentation tank 12 via bearings. The mounting plate is made of corrosion-resistant stainless steel. In this embodiment, four scrapers 25 are equidistantly arranged circumferentially around the outer periphery of the actuating cylinder 23. A gap (greater than 2 cm) is maintained between the path of the scrapers 25 during rotation and the bottom of the inclined plate 22 above the actuating cylinder 23 and the inner wall of the sludge hopper 15, ensuring that the scrapers 25 do not damage the inclined plate 22 or the inner wall of the sludge hopper 15 when scraping sludge. Meanwhile, the scraper 25 can be designed to be inclined towards the vertical plane of the center of the cylinder 23. When the cylinder 23 rotates, one end of the inclined scraper 25 first cuts into the deposited sludge, and then pushes the sludge towards the middle of the cylinder 23 along a direction perpendicular to the axis of the cylinder 23. This allows the sludge originally dispersed at both ends of the cylinder 23 to be collected in the center and then pushed to the next stage sludge hopper 15. This not only avoids the formation of "dead zones" at both ends of the cylinder 23 that would cause sludge residue, but also ensures that the sludge moves evenly forward along the center of the flow channel between the bottom of the inclined plate 22 and the sludge hopper 15 each time it is scraped, ensuring a balanced load between the front and rear sludge hoppers 15 and improving the efficiency of multi-stage transfer.

[0029] See Figure 7The pry cylinder 23 is circumferentially staggered with several sets of mounting parts 31, which are connected and fixed to the scraper 25 by threaded fasteners 32. Specifically, the mounting part 31 includes two sets of clamping plates 33, and the scraper 25 includes a fixing part 34 and a curved part 35. The fixing part 34 is inserted into the groove 36 formed between the two sets of clamping plates 33. The threaded fasteners 32 are several sets of bolts and nuts. The clamping plates 33 have elongated holes 37, and the fixing part 34 has round holes 38. The fixing part 34 is inserted between the two sets of clamping plates 33 and then fixed by screwing on the bolts and nuts.

[0030] The drive component 24 is a hydraulic motor, which is connected to the end of the pry cylinder 23 via a coupling. The hydraulic motor can be an existing high-torque hydraulic motor. Compared with the electric motor, the hydraulic motor has a large torque at low speed (1–5 rpm), which meets the actual sludge agitation requirements.

[0031] The sludge hopper 15 is equipped with a discharge port 41 at its bottom, and a discharge pipe 42 is installed below the sedimentation tank 12. All discharge ports 41 are connected to the discharge pipe 42. Each discharge port 41 flows into the discharge pipe 42 through a short pipe section 43 and is discharged centrally. A check valve 44 is installed at the confluence node to prevent backflow of the discharged sludge and water.

[0032] The sludge hopper 15 is provided with a flushing port 45 on its side. A nozzle 46 is provided at the flushing port 45. High-pressure water is injected into the nozzle 46 so that the water can flush the bottom of the hopper and the dead corners of the side wall, so that the residual sludge can be completely removed and flow into the sewage pipe 42 with the flushing water. This avoids the accumulation of sludge or blockage in dead corners after long-term operation, and improves the reliability and maintenance convenience of the system.

[0033] The flocculation tank 11 is equipped with a baffle 51, which divides the flocculation tank 11 into an inlet zone 52 and an outlet zone 53. The inlet 13 is located on one side of the inlet zone 52. A notch 54 is provided at the bottom of the baffle 51. The outlet zone 53 is connected to the bottom of the sedimentation tank 12 via a pipe 55 on its upper side wall. The notch 54 allows wastewater to flow from the top of the inlet zone 52 downwards, then upwards, and finally into the bottom of the sedimentation tank 12 through the pipe 55 in the outlet zone 53. This ensures sufficient flocculation retention time, allowing the wastewater to mix thoroughly with the flocculant between the upper and lower sections of the baffle 51, promoting floc growth.

[0034] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. A structure for a chemical wastewater flocculation sedimentation separation tank, comprising a flocculation tank and a sedimentation tank connected to each other, wherein the flocculation tank is provided with an inlet and the sedimentation tank is provided with an outlet, characterized in that, The sedimentation tank has several sludge hoppers arranged sequentially along the water flow direction at the bottom, and each sludge hopper is equipped with a moving component for moving sludge to the next sludge hopper.

2. The structure of a chemical wastewater flocculation sedimentation separation tank according to claim 1, characterized in that: The actuating assembly includes a rotatable cylinder mounted in the sedimentation tank and a driving component that drives the cylinder to rotate. The cylinder is detachably connected to a scraper in the circumferential direction.

3. The structure of a chemical wastewater flocculation sedimentation separation tank according to claim 2, characterized in that: The paddle cylinder is provided with a mounting part in the circumferential direction, and the mounting part is connected and fixed to the scraper by threaded fasteners.

4. The structure of a chemical wastewater flocculation sedimentation separation tank according to claim 3, characterized in that: The mounting part includes two sets of clamping plates, and the scraper includes a fixing part and a curved part. The fixing part is adapted to the clamping groove formed between the two sets of clamping plates.

5. The structure of a chemical wastewater flocculation sedimentation separation tank according to claim 4, characterized in that: The threaded fasteners consist of several sets of bolts and nuts. The clamping plates have elongated holes, and the fixing parts have round holes. The fixing parts are inserted between two sets of clamping plates.

6. The structure of a chemical wastewater flocculation sedimentation separation tank according to claim 2, characterized in that: The driving component is a hydraulic motor.

7. The structure of a chemical wastewater flocculation sedimentation separation tank according to claim 1, characterized in that: The sludge hopper is equipped with a sewage outlet at the bottom, and the sedimentation tank is equipped with a sewage pipe below it. All sewage outlets are connected to the sewage pipe.

8. The structure of a chemical wastewater flocculation sedimentation separation tank according to claim 1, characterized in that: The sludge hopper is provided with a flushing port on its side.

9. The structure of a chemical wastewater flocculation sedimentation separation tank according to claim 1, characterized in that: The flocculation tank is equipped with a baffle plate, which divides the flocculation tank into an inlet zone and an outlet zone. The inlet is located on one side of the inlet zone, and a notch is provided at the bottom of the baffle plate. The outlet zone is connected to the bottom of the sedimentation tank via a pipe on the side wall near the top.

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