An improved high-density clarifier for semiconductor fluorine-containing wastewater treatment

Abstract

The utility model provides an improved high density clarifying basin for semiconductor fluorine-containing wastewater treatment relates to wastewater treatment field, including the pool body from the intermediate water distribution ditch water inlet, the inclined pipe in the pool body is installed in the both sides of water inlet area, the water inlet area's just below fixed mounting has the flow guide wall of the top section of triangle, the both sides of flow guide wall top fixed mounting has the flow guide board of inclined setting, the flow guide board sets down the water inlet side of inclined pipe, the height of flow guide board bottom end distance sludge hopper upper edge is greater than the height of flow guide board top end distance inclined pipe bottom, through the water inlet from the intermediate water distribution ditch of pool body, can the inclined pipe of wastewater can move to both sides in the pool body center, reduce the flow distance of wastewater, the flow guide board below inclined pipe can guide the shunt wastewater to the area below the inclined pipe far from the water inlet side, and then reduce the sludge height close to the water inlet side inclined pipe, avoid the phenomenon of turning mud caused by local sludge accumulation.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an improved high-density clarification tank for treating semiconductor fluoride-containing wastewater. Background Technology

[0002] In existing clarifiers, the inlet area is located on one side of the tank. During wastewater clarification, the sludge concentration on the inlet side is relatively high, resulting in a large sludge load and a large settling zone (the area between the inclined tube and the sludge hopper). This contributes to higher equipment manufacturing costs. Furthermore, the inclined tube on the inlet side (or the inclined tube in the area with a high sludge load) is prone to sludge overturning, leading to higher suspended solids in the effluent. Because more sludge settles in the inclined tube on the inlet side, the sludge accumulation below the inclined tube is greater than that further away, causing uneven sludge concentration in different sludge hoppers. Automatic valves need to be installed on the sludge discharge pipes of different sludge hoppers to adjust the sludge discharge time in order to achieve a more balanced sludge concentration during discharge, further increasing production equipment costs. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides an improved high-density clarifier for treating semiconductor fluoride-containing wastewater. By introducing water into the central distribution channel of the tank, the wastewater can move from the center of the tank towards the inclined tubes on both sides, reducing the flow distance of the wastewater. This mitigates the problem of wastewater not fully covering the area below the inclined tubes due to the original one-sided water intake. Simultaneously, the guide plates below the inclined tubes guide the diverted wastewater to the area below the inclined tubes away from the inlet side, reducing the wastewater load near the inlet side of the inclined tubes. This allows the wastewater to flow more evenly to the area below the inclined tubes, thereby reducing the sludge height near the inlet side of the inclined tubes and preventing sludge accumulation and sludge overturning. This solves the problems mentioned in the background art.

[0004] Technical solution

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an improved high-density clarifier for semiconductor fluoride wastewater treatment, comprising a tank body that receives water from a central distribution channel, inclined tubes installed on both sides of the water inlet zone in the tank body, a guide wall with a triangular top cross-section fixedly installed directly below the water inlet zone, inclined guide plates fixedly installed on the upper sides of both sides of the guide wall, the guide plates being positioned below the water inlet side of the inclined tubes, and the height of the bottom end of the guide plate from the upper edge of the sludge hopper being greater than the height of the top end of the guide plate from the bottom end of the inclined tube.

[0006] Furthermore, the flow direction of the guide wall faces the inclined tubes on both sides of the tank. When the wastewater flows to both sides through the top of the guide wall, the flow range of the wastewater covers the area between the bottom of the inclined tube and the top of the sludge hopper.

[0007] Furthermore, the sludge hoppers are respectively located at the bottom of the pool body below the inclined pipes on both sides of the inlet area, and the sludge hoppers are conical in shape.

[0008] Furthermore, scrapers are installed above both sludge hoppers. The bottom of the scrapers contacts the inclined surface of the sludge hopper. When viewed from above, the scrapers are inclined in the X-axis or Y-axis direction. When the scrapers rotate, they can gather the sludge on the inclined surface of the sludge hopper towards the sedimentation tank in the center of the sludge hopper.

[0009] Furthermore, the upper surface of the scraper plate is fixedly connected to the mixing frame, and the center of the mixing frame is fixedly connected to the output end of the mixer via a drive shaft.

[0010] Furthermore, a sludge suction pipe is laid at the bottom of the sedimentation tank to guide the sludge out.

[0011] The beneficial effects of this utility model are as follows:

[0012] By introducing water from the central distribution channel of the tank, wastewater can move from the center of the tank towards the area below the inclined tubes on both sides, reducing the flow distance of the wastewater. This avoids the problem of wastewater traveling a long distance and failing to fully cover the area below the inclined tubes, which was previously caused by water entering from one side of the tank. At the same time, the guide plate below the water inlet side of the inclined tubes can guide the diverted wastewater to the area below the inclined tubes away from the water inlet side, balancing the sludge concentration of the wastewater below the inclined tubes. This allows the wastewater to flow more evenly to the area below the inclined tubes, thereby reducing the sludge height near the water inlet side of the inclined tubes. As a result, the sludge sedimentation thickness on the sludge hopper is more uniform, avoiding sludge overturning caused by local sludge accumulation. Furthermore, by using a sludge scraper, the sludge above the sludge hopper is scraped into the sedimentation tank in the center of the sludge hopper. When suctioning sludge, only one suction pipe is needed to clean the sludge from the sedimentation tank, reducing the cost of production equipment. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the pool body of this utility model;

[0014] Figure 2 This is a cross-sectional view of the pool body in the prior art;

[0015] Figure 3 This is a top view of the pool body of this utility model;

[0016] Figure 4 This is a schematic diagram of the connection structure between the mixing rack and the scraper of this utility model.

[0017] The components are as follows: 1. Tank body; 2. Inclined pipe; 3. Inlet area; 4. Guide wall; 5. Guide plate; 6. Sludge hopper; 7. Sludge scraper; 8. Sedimentation tank; 9. Agitator; 10. Sludge suction pipe; 11. Water collection pipe; 12. Water collection trough; 13. Sludge collection hopper; 14. Sludge discharge pipe. Detailed Implementation

[0018] 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.

[0019] See Figures 1-4 An improved high-density clarifier for treating fluoride-containing wastewater from semiconductors includes a tank body 1 that receives water from an intermediate distribution channel. Inclined tubes 2 are installed on both sides of an inlet zone 3 in the tank body 1. A guide wall 4 with a triangular top cross-section is fixedly installed directly below the inlet zone 3. Inclined guide plates 5 are fixedly installed on the upper sides of both sides of the guide wall 4. The guide plates 5 are located below the inlet side of the inclined tubes 2. The height of the bottom end of the guide plate 5 from the upper edge of the sludge hopper 6 is greater than the height of the top end of the guide plate 5 from the bottom end of the inclined tube 2.

[0020] In this plan: (e.g.) Figure 2 As shown, the original clarifier received water from one side of tank 1. The sludge concentration on the inlet side was relatively high, resulting in a large sludge load and a large settling zone (the area between the inclined tube 2 and the sludge collection hopper 13). This contributed to the higher equipment manufacturing cost, and the inclined tube 2 on the inlet side (or the inclined tube 2 in the area with a high sludge load) was prone to sludge backflow. Figure 1 As shown, by introducing water from the middle section of tank 1, the wastewater can move from the center of tank 1 towards the inclined pipes 2 on both sides, reducing the flow distance of the wastewater. This mitigates the problem of wastewater not fully covering the inclined pipes 2 due to the original method of introducing water from one side of tank 1. Simultaneously, the guide plate 5 below the inclined pipe 2 guides the diverted wastewater to the area below the inclined pipe 2 away from the inlet side. When the wastewater passes through the guide plate 5, a small portion flows to the area below the inlet side of the inclined pipe 2, while most of the wastewater flows from the bottom of the guide plate 5 and away from the sludge. The area between hopper 6 and the sludge hopper 6 is traversed, allowing the wastewater to be more evenly distributed throughout the area below the inclined tube 2. This achieves a more balanced distribution of sludge concentration in the wastewater within the inclined tube 2, reducing the sludge height near the inlet side of the inclined tube 2. Consequently, the sludge sedimentation thickness on the sludge hopper 6 is more uniform, preventing sludge overturning caused by excessive local sludge accumulation. It should be noted that the inclined tube 2 is installed in the upper settling zone of the tank 1, and a 300mm-500mm clear water zone is provided at the top of the settling zone. Figure 1As shown, the height ratio a / b of the vertical distance 'a' from the bottom of the inclined tube 2 to the bottom of the guide plate and the vertical distance 'b' from the bottom of the guide plate to the upper edge of the sludge hopper is 0.46~0.52. This allows for balanced water distribution, enabling the wastewater (containing some sludge particles) to rise slowly and evenly in the settling zone below the inclined tube, while most of the sludge slowly descends. This also avoids the wastewater impacting the lower part (the concentrated sludge above the sludge hopper) after water distribution, preventing changes in the concentration of the already concentrated sludge. The angle α of the guide plate 5 is best between 77° and 83°. The normal installation angle of the inclined tube 2 is generally 60°, with a length of 1.0m. At this angle, the sludge settling effect in the inclined tube 2 is optimal. The guide plate 5, with an angle of 77°-83°, is slightly larger than the inclination angle of the inclined tube 2. This allows the water flow to first make a "large-angle turn" through the guide plate 5, and then quickly converge towards the inclined tube 2. Furthermore, the flow is already stable before entering the inclined tube 2, avoiding turbulence that could disrupt sedimentation and affect the sedimentation effect. The steeper surface of the guide plate 5 at a large angle also allows any sediment to slide off quickly due to gravity, reducing the risk of accumulation. When the angle is 77°-83°, the uniformity of the flow velocity distribution after the turn is optimal. If the angle is <75°, the flow guidance is insufficient, and the central flow deviation is still severe. If the angle is >85°, the water flow impacts the sediment on the conical surface of the sludge hopper 6, causing sludge rebound, forming eddies, disrupting uniformity, and reducing the sludge sedimentation effect.

[0021] The flow direction of the guide wall 4 faces the inclined tubes 2 on both sides inside the pool 1. When the wastewater flows to both sides through the top of the guide wall 4, the flow range of the wastewater covers the area between the bottom of the inclined tubes 2 and the top of the sludge hopper 6.

[0022] In this embodiment: when the wastewater passes through the guide wall 4, the top cross-section of the guide wall 4 is triangular, which allows the wastewater to be diverted to both sides of the guide wall 4, achieving a balanced water distribution on both sides, thus ensuring that the hydraulic load on both sides is consistent. Furthermore, the inclined top of the guide wall 4 can better guide and transfer most of the wastewater to the bottom of the guide plate 5, preventing newly entering wastewater from accumulating below the inlet inclined pipe 2, reducing the sedimentation load near the inlet inclined pipe 2, and facilitating the uniform flow and diffusion of wastewater to the bottom of the inclined pipe 2 at various locations.

[0023] The sludge hoppers 6 are respectively set at the bottom of the pool body 1 below the inclined pipes 2 on both sides of the water inlet zone 3, and the sludge hoppers 6 are conical.

[0024] In this embodiment, the sludge hopper 6 is conical. The sediment settling in the inclined tube 2 can slide down to the lower part of the sludge hopper 6 after settling above it. At the same time, the scraper 7 accelerates the sludge to gather and accumulate in the center of the sludge hopper 6, which is convenient for subsequent centralized sludge collection. It should be noted that the length-to-width ratio of the two sedimentation zones of the tank 1 is between 1.0 and 1.2, so that the tank shape is as close to a square as possible. On the one hand, controlling the length-to-width ratio of the sedimentation zone between 1.0 and 1.2 is to achieve a balanced sludge load in the inclined tube 2 area of ​​the tank 1 in combination with the water inlet method, thereby ensuring the balanced load of the tank 1 and maximizing the sedimentation effect of each sedimentation zone. On the other hand, controlling the length-to-width ratio of the sedimentation zone is conducive to ensuring that the sludge hopper 6 at the bottom of the tank 1 is conical, ensuring that the settled sludge is effectively scraped to the sludge concentration zone of the sludge hopper 6 by the scraper 7.

[0025] Sludge scrapers 7 are installed above both sludge hoppers 6. The bottom of the scraper 7 is in contact with the inclined surface of the sludge hopper 6. In a top view, the scraper 7 is inclined in the X-axis or Y-axis direction. When the scraper 7 rotates, it can gather the sludge on the inclined surface of the sludge hopper 6 towards the sedimentation tank 8 in the center of the sludge hopper 6.

[0026] In this embodiment: as follows Figure 1 As shown, the bottom of the scraper 7 is attached to the inclined surface of the sludge hopper 6. When the scraper 7 rotates, the center of convergence of the inclined scraper 7 is the sedimentation tank 8. Therefore, during the rotation of the scraper 7, the sludge settled on the inclined surface of the sludge hopper 6 can be concentrated and pushed into the sedimentation tank 8. In addition, during the process of cleaning the sludge on the inclined surface of the sludge hopper 6, the scraper 7 can also reduce the accumulation height of sludge on the sedimentation tank 8, and avoid the phenomenon of sludge overturning caused by high sludge accumulation due to untimely sludge cleaning.

[0027] The upper surface of the scraper 7 is fixedly connected to the mixing frame 9, and the center of the mixing frame 9 is fixedly connected to the output end of the mixer via a drive shaft.

[0028] In this embodiment: as follows Figure 1 , Figure 4 As shown, the mixing frame 9 is used to support the scraper 7. The mixer can drive the mixing frame 9 and the scraper 7 to rotate through the drive shaft. It should be noted that the drive shaft of the mixer passes through the inside of the inclined tube 2 (i.e., the inclined tube 2 has a reserved mounting hole to accommodate the drive shaft). The scraper 7 is inclined and fits against the inclined surface of the sludge hopper 6. The scraper 7 as a whole, as well as the inclined surfaces of the mixing frame 9 and the sludge hopper 6, are parallel. The scraper 7 is usually made of semi-soft rubber material.

[0029] The bottom of the sedimentation tank 8 is equipped with a sludge suction pipe 10 that can guide the sludge out.

[0030] In this embodiment: as follows Figure 2As shown in the diagram, when the original pool 1 was filled with water, water entered from one side of the pool 1. As the wastewater rose, particles in the wastewater were filtered through inclined tubes 2. After colliding with each other in the inclined tubes 2, the particles settled and precipitated. The settled water flowed to the top of the inclined tubes 2 (i.e., the supernatant). The clear water was then introduced into the collection tank 12 through the collection pipe 11. The settled sludge fell into each sludge collection hopper 13 and was discharged through each sludge discharge pipe 14 in each sludge collection hopper 13. During sludge discharge, when the sludge accumulation in the inclined tubes 2 on the water inlet side was high, the sludge accumulation height away from the inclined tubes 2 on the water inlet side might be much lower. The sludge height in the sludge collection hoppers 13 was uneven, requiring the installation of an automatic valve to adjust the sludge discharge time, which increased equipment costs. Figure 1 , Figure 3 As shown, after the improvement, since the sludge in the sludge hopper 6 will be concentrated and scraped into the sedimentation tank 8 in the center of the sludge hopper 6, at this time, only one suction pipe 10 needs to be laid in the sedimentation tank 8 to suck up the sludge, which effectively reduces the number of suction pipes 10 used and saves production costs. It should be noted that in order to prevent the suction pipe 10 from being blocked, a cleaning pipe can be set in the outlet pipe of the suction pipe 10. When the equipment is stopped and the inclined pipe 2 in the cleaning tank 1 is cleaned, tap water or supernatant can be used to backwash the suction pipe 10 regularly to keep the internal channel of the suction pipe 10 smooth.

[0031] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An improved high-density clarifier for treating fluoride-containing wastewater from semiconductor manufacturing, characterized in that: The pool (1) is fed into the middle distribution channel. Inclined pipes (2) in the pool (1) are installed on both sides of the water inlet area (3). A guide wall (4) with a triangular top section is fixedly installed directly below the water inlet area (3). Inclined guide plates (5) are fixedly installed on the upper sides of both sides of the guide wall (4). The guide plates (5) are located below the water inlet side of the inclined pipe (2). The height of the bottom of the guide plate (5) from the upper edge of the sludge hopper (6) is greater than the height of the top of the guide plate (5) from the bottom of the inclined pipe (2).

2. The improved high-density clarifier for treating fluoride-containing wastewater from semiconductors according to claim 1, characterized in that: The flow direction of the guide wall (4) faces the inclined tubes (2) on both sides inside the pool (1). When the wastewater flows to both sides through the top of the guide wall (4), the flow range of the wastewater covers the area between the bottom of the inclined tube (2) and the top of the sludge hopper (6).

3. An improved high-density clarifier for treating fluoride-containing wastewater from semiconductors according to claim 1 or 2, characterized in that: The sludge hoppers (6) are respectively set at the bottom of the pool body (1) below the inclined pipes (2) on both sides of the water inlet area (3), and the sludge hoppers (6) are conical.

4. An improved high-density clarifier for treating fluoride-containing wastewater from semiconductors according to claim 3, characterized in that: Scraper blades (7) are provided above both sludge hoppers (6). The bottom of the scraper blades (7) is in contact with the inclined surface of the sludge hoppers (6). In the top view, the scraper blades (7) are inclined in the X-axis or Y-axis direction. When the scraper blades (7) rotate, they can gather the sludge on the inclined surface of the sludge hoppers (6) towards the sedimentation tank (8) in the center of the sludge hoppers (6).

5. An improved high-density clarifier for treating fluoride-containing wastewater from semiconductors according to claim 4, characterized in that: The upper surface of the scraper (7) is fixedly connected to the mixing frame (9), and the center of the mixing frame (9) is fixedly connected to the output end of the mixer through the drive shaft.

6. An improved high-density clarifier for treating fluoride-containing wastewater from semiconductors according to claim 4 or 5, characterized in that: The bottom of the sedimentation tank (8) is equipped with a sludge suction pipe (10) that can guide the sludge out.

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