A dosing device and a sludge sedimentation tank comprising the same

Abstract

The application relates to the field of environmental protection, in particular to a dosing device and a sludge sedimentation tank containing the same, which comprises a vertical pipe, a water inlet pipe and a dosing pipe, the water inlet pipe is connected to the side wall of the vertical pipe, and the outlet end of the water inlet pipe and the inner wall of the vertical pipe are opposite to each other; the outlet end of the dosing pipe is located in the interior of the vertical pipe, the outlet end of the dosing pipe faces downward, and the outlet end of the dosing pipe is located above the outlet end of the water inlet pipe. Through the scheme, the dosing and mixing of wastewater can be realized in a lower-cost mode, the mechanical structure is reduced in the aspect of dosing, and the dosing and mixing effect can be ensured.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, specifically to a dosing device and a sludge sedimentation tank containing the dosing device. Background Technology

[0002] Sedimentation tanks are crucial equipment in wastewater treatment processes. Their primary function is to separate sediments from water using gravity settling, thereby improving water quality. Sedimentation tanks are suitable for large-scale wastewater treatment scenarios (such as city-wide wastewater treatment systems). In these cases, the tank is connected to both inlet and outlet pipes. Water enters the tank through the inlet pipe, where impurities settle. Simultaneously, water flows out of the tank through the outlet pipe, ensuring continuous water flow and preventing high upstream water pressure caused by cessation of inflow and outflow. This design is ideal for large-scale wastewater treatment. Sedimentation tanks can also be used for smaller-scale wastewater treatment scenarios (where the wastewater source is relatively small, and the volume is limited, such as wastewater from a factory, a household or residential area, farmland, or a commercial or office building). In these cases, due to the smaller volume, the wastewater can be discharged into the sedimentation tank for a period of settling before being discharged to the next treatment stage.

[0003] Whether used for large-scale or small-scale wastewater treatment, sedimentation tanks typically involve adding phosphorus removal agents to the wastewater during the sedimentation process. These agents primarily remove phosphorus from the water to reduce environmental pollution and protect water quality. Excessive phosphorus levels can lead to eutrophication, promoting algal growth and disrupting the aquatic ecosystem.

[0004] Currently, chemical dosing is achieved by installing a pipeline mixer on the sedimentation tank. The chemical and wastewater are mixed in the pipeline mixer. After being mixed evenly, the phosphorus removal agent combines with the phosphorus in the water to form an insoluble precipitate, which then settles in the sedimentation tank.

[0005] However, for most vertical flow sedimentation tanks, it is difficult to install the dosing pipeline in the form of a pipe mixer when designing the dosing system. Firstly, pipe mixers are expensive, requiring consideration of high costs; secondly, the structure of vertical flow sedimentation tanks is relatively compact, making it difficult to fit a large-footprint pipe mixer in the already limited space; and thirdly, for scenarios with smaller wastewater treatment volumes, the pipes in the pipe mixer are too small, and the inside of the small-diameter pipe mixer is prone to sludge caking, causing blockages. Summary of the Invention

[0006] The present invention aims to provide a dosing device and a sludge sedimentation tank containing the dosing device, so as to achieve the dosing and mixing of chemicals in wastewater in a lower cost manner, reduce the addition of mechanical structures in the dosing process, eliminate the need to install pipeline mixers, and at the same time ensure the dosing and mixing effect.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a dosing device, comprising a vertical pipe, a water inlet pipe, and a dosing pipe, wherein the water inlet pipe is connected to the side wall of the vertical pipe, and the outlet end of the water inlet pipe is directly opposite the inner wall of the vertical pipe; the outlet end of the dosing pipe is located inside the vertical pipe, the outlet end of the dosing pipe faces downward, and the outlet end of the dosing pipe is located above the outlet end of the water inlet pipe.

[0008] To achieve the above objectives, the present invention also adopts the following technical solution: a sludge sedimentation tank, including a tank body and a dosing device, with a vertical pipe inserted vertically into the tank body.

[0009] The principle and advantages of the scheme in this application are as follows: The inlet pipe allows wastewater to enter the vertical pipe, which then flows into the tank. After the water flows out from the outlet of the inlet pipe, because the outlet is directly opposite the inner wall of the vertical pipe, the water collides with the inner wall, changing the flow from a horizontal state to a turbulent state. Turbulent flow refers to the disordered and diffusing nature of the fluid under the impact of the vertical pipe's inner wall, with vortices present. Then, the chemical is added to the vertical pipe through the dosing pipe. The chemical flows downwards from the outlet of the dosing pipe. Under the action of the water vortex, the water and chemical mix and agitate, resulting in a more uniform mixture of chemical and wastewater. This eliminates the need for pipe mixers or mechanical stirring structures for chemical dosing, reducing the need for mechanical structures. A simpler pipe system can ensure effective mixing. This also allows for precise chemical dosing, reducing waste, saving on usage, and improving the effectiveness of the chemical.

[0010] In this application, the reason why the outlet end of the dosing pipe is set inside the vertical pipe instead of being directly connected to the inlet pipe is because the water entering the inlet pipe is either pipe flow or open channel flow, which is a laminar flow state. At this time, adding the agent directly into the inlet pipe through the dosing pipe will not achieve a good mixing effect.

[0011] When the dosing device of this application is applied to a sludge sedimentation tank, the vertical pipe and the inlet pipe can be the existing structure of the sludge sedimentation tank. The existing structure of the vertical pipe and the inlet pipe of the sludge sedimentation tank can be directly applied without additional settings. At this time, it is only necessary to add a dosing pipe to the existing structure of the sludge sedimentation tank and set the outlet end of the dosing pipe inside the vertical pipe. The structure is simpler and more convenient, reducing the addition of mechanical structures. The dosing and mixing effect can be guaranteed by using a relatively simple pipeline.

[0012] Preferably, as an improvement, the centerline of the outlet end of the dosing pipe coincides with the centerline of the vertical pipe, and the diameter of the outlet end of the dosing pipe is smaller than the diameter of the vertical pipe.

[0013] Therefore, the agent flowing out of the dosing pipe outlet will not stick tightly to the inner wall of the vertical pipe. After the agent comes into contact with the water, it can move and mix in all directions, thereby improving the mixing effect of the agent and water.

[0014] Preferably, as an improvement, the outlet end of the water inlet pipe is located at the pipe wall of the riser.

[0015] Therefore, the wall of the water inlet pipe will not be located directly below the outlet end of the dosing pipe, and the wall of the water inlet pipe will not be directly opposite the outlet end of the dosing pipe. This avoids the water inlet pipe wall from obstructing the mixing of the agent and water, thus ensuring the mixing effect of water and agent.

[0016] Preferably, as an improvement, the vertical pipe has a hole in its wall, the dosing pipe passes through the hole, and one end of the dosing pipe inside the vertical pipe is connected to an elbow, with the outlet of the elbow facing downwards as the outlet end of the dosing pipe.

[0017] Therefore, by connecting an elbow to one end of the dosing pipe located inside the vertical pipe, the dosing pipe is made to have a downward-facing outlet end.

[0018] Preferably, as an improvement, the vertical distance between the outlet end of the dosing pipe and the outlet end of the inlet pipe is 5-20cm.

[0019] Preferably, as an improvement, a sealing material is provided between the dosing tube and the inner wall of the orifice. The sealing material is used to seal the gap between the dosing tube and the orifice.

[0020] In addition, existing sludge sedimentation tanks typically come in two types: one used as a primary sedimentation tank and the other as a secondary sedimentation tank. During wastewater treatment, wastewater is first introduced into the primary sedimentation tank to allow large particles to settle, purifying the wastewater once. Then, the wastewater from the primary sedimentation tank is introduced into the secondary sedimentation tank, where phosphorus removal agents are added to remove phosphorus. The phosphorus removal agents react with impurities in the wastewater to form precipitates, which then settle in the secondary sedimentation tank. The reason for using two separate sedimentation tanks is partly because the primary sedimentation tank contains phosphorus, which can be used as fertilizer raw material. The phosphorus removal agent added to the secondary sedimentation tank does not affect the phosphorus in the primary sedimentation tank precipitate. Therefore, in existing technology, if large particles and phosphorus removal are precipitated in a single sedimentation tank, the subsequent addition of phosphorus removal agent may react with the primary sediment at the bottom of the tank, significantly reducing the phosphorus content and affecting its suitability as fertilizer. This also wastes the phosphorus removal agent. Therefore, separate sedimentation in two tanks is necessary. This works fine for large wastewater volumes. However, for smaller wastewater volumes with limited space, using two separate sedimentation tanks occupies significantly more space than a single tank, obviously increasing installation and maintenance costs.

[0021] To address this, this application also provides a sludge settling tank that enables both primary and secondary sedimentation of wastewater, eliminating the need for separate sedimentation in two separate tanks. This solves the problem of large space requirements associated with two separate sedimentation tanks and is suitable for scenarios with smaller wastewater treatment volumes. Furthermore, during secondary sedimentation with the addition of a phosphorus removal agent, it inhibits the reaction between the agent and the primary sediment, reducing the phosphorus removal effect on the primary sediment caused by the addition of the phosphorus removal agent.

[0022] To solve the above problems, this application adopts the following solution: a sludge sedimentation tank, including a tank body, in which a barrier unit is provided, dividing the tank body into an upper part and a lower part, and an inlet pipe located at the upper part is connected to the tank body; the barrier unit includes multiple barrier components, which are arranged horizontally; each barrier component includes a rotating plate and a sliding plate, the ends of the rotating plate are rotatably connected to the tank body, the sliding plate is located on the upper side of the rotating plate, the sliding plate is perpendicular to the rotating plate, and the bottom of the sliding plate is slidably connected to the upper side of the rotating plate;

[0023] The barrier unit has a first static state, at which time the rotating plates of multiple barrier components are all tilted and tilted in the same direction; the right end of the rotating plate is the low end and the left end of the rotating plate is the high end; in two adjacent barrier components, the sliding plate of the left barrier component abuts against the left end of the rotating plate of the right barrier component.

[0024] The barrier unit has a second static state, in which the rotating plates of multiple barrier components are all tilted and tilted in the same direction; the left end of the rotating plate is the low end and the right end of the rotating plate is the high end; in two adjacent barrier components, the sliding plate of the right barrier component abuts against the right end of the rotating plate of the left barrier component.

[0025] The blocking unit switches between a first static state and a second static state by rotating the rotating plate.

[0026] Thus, initially, wastewater is added to the sludge sedimentation tank through the inlet pipe, and then allowed to settle for initial sedimentation. At this time, the barrier unit is in either the first static state or the second static state (in which state the barrier unit is in a closed state). The barrier unit is located between the upper and lower parts, and the barrier unit blocks the upper and lower parts. The wastewater in the tank undergoes initial sedimentation, and the initially settled substances fall onto the barrier unit.

[0027] After initial sedimentation, the barrier unit rotates, changing from one of its first or second static states to the other. During this process, the rotating plate rotates and tilts to the other side. The sliding plate slides on the rotating plate under the influence of gravity, pushing the initially settled sediment downwards. At this time, there are gaps between adjacent barrier components, allowing the initially settled sediment to pass through these gaps and enter the lower part for collection. When the barrier unit rotates to another state, the adjacent barrier components are in a blocking state, and the barrier unit closes again, effectively blocking both the upper and lower parts.

[0028] Then, a phosphorus removal agent is added to the upper part (the method of adding the phosphorus removal agent does not necessarily have to use the dosing device of this application). The phosphorus removal agent reacts with the wastewater, thereby removing phosphorus-containing substances from the wastewater. The phosphorus removal agent reacts with the phosphorus-containing substances to generate secondary precipitates, which settle downwards onto the barrier unit. Because the barrier unit isolates the upper and lower parts at this time, the phosphorus removal agent in the upper part will not enter the lower part in large quantities and react with the primary precipitate in the lower part, thus preventing the removal of phosphorus from the primary precipitate.

[0029] After the secondary phosphorus removal sedimentation, the barrier unit rotates and returns to its initial state. During this process, the rotating plate rotates and tilts to the other side. The sliding plate slides on the rotating plate under the action of gravity, thereby pushing the secondary sediment on the rotating plate downward. At this time, there are gaps between adjacent barrier components, and the sediment enters the lower part through the gaps and is collected.

[0030] Finally, the primary and secondary sediments in the lower part are discharged together, and the liquid in the upper part is discharged into the equipment of the next wastewater treatment stage.

[0031] Therefore, the proposed solution has the following advantages: 1. Both the primary and secondary sedimentation operations in the wastewater are carried out in a sludge sedimentation tank. Compared with the existing technology, there is no longer a distinction between the primary and secondary sedimentation tanks. When applied to scenarios with small wastewater treatment volumes, it reduces the use of one sedimentation tank, thereby reducing equipment costs and space occupancy.

[0032] 2. In this application, the primary sedimentation and secondary sedimentation for phosphorus removal are carried out in the same sludge sedimentation tank. During the secondary sedimentation for phosphorus removal, the primary sediment is located at the bottom. The barrier unit provides a certain degree of barrier between the liquid in the upper part and the primary sediment in the lower part. Thus, when phosphorus removal agent is added to the upper part, the barrier unit provides a certain degree of barrier to the phosphorus removal agent entering the lower part, thereby reducing the reaction between the phosphorus removal agent and the primary sediment in the lower part, reducing the waste of phosphorus removal agent, ensuring that phosphorus is still present in the primary sediment, and the primary sediment can still be used as a raw material for phosphorus-containing fertilizer.

[0033] 3. After secondary sedimentation is complete, the settled material is also discharged into the lower section, where it piles together with the primary sediment. At this point, the secondary sediment and primary sediment are discharged together, a simple and convenient operation. Furthermore, since the phosphorus removal agent has already reacted with the phosphorus-containing substances in the wastewater and is consumed, there is no need to worry about the phosphorus removal agent in the wastewater flowing downwards and reacting with the primary sediment during the discharge of the secondary sediment.

[0034] 4. The barrier unit in this application has an ingenious structure. When the barrier unit is in the first or second static state, the adjacent barrier components abut against each other, and the barrier unit is in a closed state, thus achieving the function of blocking the upper and lower parts. By rotating the barrier components, the adjacent barrier components no longer abut against each other during the switching rotation of the barrier unit from the two states, thereby opening the barrier unit and allowing the precipitate to be discharged downwards into the lower part. At the same time, the sliding plate slides downwards along the rotating plate, thereby pushing the precipitate, which is more conducive to the precipitate being discharged downwards into the lower part, and preventing the precipitate from accumulating on the barrier unit.

[0035] Preferably, as an improvement, it also includes a sealing component, of which there are two and located on the left and right sides of the pool body respectively; each sealing component includes an elastic band, a movable plate and a drive rod for driving the movable plate to move laterally, the elastic band is located above the movable plate, the top end of the elastic band is fixedly connected to the inner wall of the pool body, and the bottom end of the elastic band is fixedly connected to the movable plate; the movable plates on both sides of the pool body are respectively used to abut against the two ends of the barrier unit.

[0036] Therefore, when the barrier unit is in the first static state or the second static state, the moving plates on the two sealing components abut against the two ends of the barrier unit respectively, and the elastic band is in an extended state. The sealing components play a role in sealing the gap between the end of the barrier unit and the side wall of the pool, preventing the phosphorus removal agent in the upper part from entering the lower part in large quantities through the gap between the end of the barrier unit and the side wall of the pool.

[0037] When the barrier unit needs to rotate, the drive rod drives the moving plate to move away from the end of the barrier unit. During this rotation, the sealing component does not obstruct the barrier unit. Simultaneously, there is a certain gap between the side wall of the pool and the end of the barrier unit, so the side wall of the pool also does not obstruct the rotation of the barrier unit, ensuring that the rotating plates at both ends of the barrier unit can rotate normally.

[0038] Preferably, as an improvement, the front and rear ends of the multiple rotating plates are rotatably connected to the pool body via rotating shafts, and sprockets are coaxially fixedly connected to the rotating shafts, with chains connecting the multiple sprockets.

[0039] Thus, the chain enables the linkage of multiple sprockets. When one rotating plate rotates, the other rotating plates rotate simultaneously through the transmission of sprockets and chains.

[0040] Preferably, as an improvement, sealing plates are fixedly connected to the outer sides of both the rotating plate and the sliding plate. By providing sealing plates, the sealing performance between the rotating plate and the sliding plate when they abut against each other can be improved. At the same time, the gap between the front and rear end faces of the barrier unit and the inner wall of the pool can also be sealed, thereby improving the sealing performance between the front and rear end faces of the barrier unit and the inner wall of the pool. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the sludge sedimentation tank in Example 1.

[0042] Figure 2 This is a schematic diagram of the sludge sedimentation tank in Examples 2-3, where the barrier unit is in the first static state.

[0043] Figure 3 This is a schematic diagram of the sludge sedimentation tank in Examples 2-3, where the barrier unit is in the second static state.

[0044] Figure 4 This is a top view of the sludge sedimentation tank in Examples 2-3.

[0045] Figure 5 for Figure 2 A schematic diagram of the barrier component structure in the tilt direction of the rotating plate.

[0046] Figure 6 for Figure 2 Enlarged view of the middle barrier component.

[0047] Figure 7 for Figure 3 Enlarged view of the middle barrier component. Detailed Implementation

[0048] The following detailed description illustrates the specific implementation method:

[0049] The reference numerals in the accompanying drawings include: 1. Tank body; 2. Lower part; 3. Slag discharge pipe; 4. Water inlet pipe; 5. Chemical dosing pipe; 6. Vertical pipe; 7. Elbow; 8. Reflector plate; 9. Drive rod; 10. Blocking block; 11. Elastic band; 12. Moving plate; 13. Sliding plate; 14. Rotating plate; 15. Rotating shaft; 16. Barrier assembly; 17. Sprocket; 18. Slider; 19. Circulation pipe; 20. Pump.

[0050] Example 1

[0051] The basics are as follows: Figure 1 As shown: This embodiment discloses a sludge sedimentation tank, including a tank body 1 (which can be a cement structure or a metal tank) and a dosing device. The bottom of the tank body 1 has a lower section 2, which is used to contain and collect sediment. The upper part of the tank body 1 is located above the lower section 2. A sludge discharge pipe 3 is connected to the bottom of the lower section 2, through which sediment can be discharged. A valve (not shown in the figure) is connected to the sludge discharge pipe 3. A drain pipe (not shown in the figure) is connected to the tank body 1. The drain pipe is located at the top of the tank body 1, through which the supernatant of the wastewater in the tank body 1 can be discharged. A valve is also connected to the drain pipe.

[0052] The dosing device disclosed in this embodiment (the dosing device is the innovation of this embodiment) includes a vertical pipe 6, an inlet pipe 4, and a dosing pipe 5. The vertical pipe 6 is located in the middle of the tank body 1 and is vertically inserted into the tank body 1. The inlet pipe 4 passes through the side wall of the tank body 1 and is connected (e.g., by welding or fixing with flange bolts) to the side wall of the vertical pipe 6. The connection point between the vertical pipe 6 and the side wall of the tank body 1 is the outlet end. The outlet end of the inlet pipe 4 is directly opposite the left inner wall of the vertical pipe 6.

[0053] The dosing pipe 5 is located above the inlet pipe 4. The dosing pipe 5 passes through the side wall of the tank 1. A pipe hole begins on the right side wall of the vertical pipe 6. The dosing pipe 5 passes horizontally through the pipe hole and is inserted into the vertical pipe 6. The left end of the dosing pipe 5 is threaded to a downward-facing elbow 7. The bottom of the elbow 7 serves as the outlet end of the dosing pipe 5, thus ensuring that the outlet end of the dosing pipe 5 faces downwards and is located above the outlet end of the inlet pipe 4. Alternatively, in other embodiments, the dosing pipe 5 can be vertically installed and inserted vertically into the vertical pipe 6 from the top. In this case, the bottom of the dosing pipe 5 is the outlet end, and the elbow 7 is not required.

[0054] In this embodiment, the vertical centerline of the outlet end of the dosing tube 5 coincides with the centerline of the vertical tube 6.

[0055] In this embodiment, the vertical distance between the outlet end of the dosing pipe 5 (bottom of the elbow 7) and the outlet end of the water inlet pipe 4 (upper side wall of the water inlet pipe 4) is 5-20cm.

[0056] In addition, a sealing material is provided between the dosing pipe 5 and the inner wall of the pipe hole. At the same time, corresponding sealing materials are also provided at the part where the water inlet pipe 4 passes through the pool body 1 (between the water inlet pipe 4 and the hole in the pool body 1 through which the water inlet pipe 4 passes) and at the part where the dosing pipe 5 passes through the pool body 1 (between the dosing pipe 5 and the hole in the pool body 1 through which the dosing pipe 5 passes) to seal the corresponding gaps. The sealing material can be a rubber block or cement, etc.

[0057] The interior of the pool 1 is equipped with a reflector plate 8, which reflects the downward flowing liquid upward, allowing the liquid to splash upward and reducing the impact on the bottom of the pool 1.

[0058] The specific implementation process is as follows: In this embodiment, the sludge sedimentation tank is used as a secondary sedimentation tank in scenarios with large wastewater treatment volumes. After primary sedimentation, the wastewater flows continuously to the left through the inlet pipe 4. The inlet pipe 4 is used to allow the wastewater to enter the vertical pipe 6 and flow downwards along the vertical pipe 6 into the tank body 1. After the water flows out from the outlet end of the inlet pipe 4, since the outlet end of the inlet pipe 4 is directly opposite the left inner wall of the vertical pipe 6, the water collides with the left inner wall of the vertical pipe 6, thus changing the water flow from a horizontal state entering the vertical pipe 6 to a turbulent state. That is, the fluid exhibits disorder and diffusion under the impact, and vortices are present in the fluid. Then, the chemical is added to the vertical pipe 6 through the dosing pipe 5. The chemical flows downwards through the elbow 7. Under the action of the water vortex, the water and the chemical mix and agitate with each other, thus making the chemical and wastewater mix more evenly.

[0059] When the drug and wastewater are mixed, the drug and substances in the wastewater react. For example, the phosphorus removal agent reacts with substances in the wastewater to form flocculent precipitates. The precipitates settle downwards into the lower part 2 and are collected, thereby achieving the sedimentation of impurities in the wastewater.

[0060] After settling is complete, open the sludge discharge pipe 3, and then discharge the sediment from the lower part 2 through the sludge discharge pipe 3. Throughout the wastewater treatment process, the supernatant in the top of the tank 1 is continuously discharged through the drain pipe.

[0061] Example 2

[0062] This embodiment discloses another type of sludge sedimentation tank with a different structure, which is applied to scenarios with small wastewater treatment volumes, combined with Figures 2-7 As shown, the system includes a pool body 1 (which can be a cement structure or a metal tank). A baffle unit is installed within the pool body 1, with gaps between the two ends of the baffle unit and the left and right side walls of the pool body 1. The baffle unit divides the pool body 1 into an upper section (the inner wall of the upper section is a square structure when viewed from above) and a lower section 2. A water inlet pipe 4 is connected to the upper section of the pool body 1, and a vertical pipe 6 is connected to the water inlet pipe 4, located inside the pool body 1. A drain pipe (not shown in the figure) is located above the baffle unit in the upper section of the pool body 1, and a valve is connected to the drain pipe. The drain pipe is located in the lower-middle part of the upper section of the pool body 1. A slag discharge pipe 3 is connected to the lower section 2.

[0063] The barrier unit in this embodiment includes multiple barrier components 16. The figure illustrates four barrier components 16, but other numbers are possible in other embodiments. The number of barrier components 16 depends on the width of the pool body 1 and the size of the barrier components 16. In this embodiment, the four barrier components 16 are arranged horizontally. Each barrier component 16 includes a rotating plate 14 and a sliding plate 13. The ends of the rotating plates 14 are rotatably connected to the pool body 1. The specific rotation method is as follows: [The text abruptly ends here, so the translation stops.] Figures 4-6 As shown, rotating plates 14 have rotating shafts 15 fixed (e.g., integrally fixed, welded fixed) at both ends. The front and rear side walls of the tank body 1 are provided with shaft holes. The rotating shafts 15 pass through these shaft holes, and rotation of the rotating plates 14 is achieved by rotating the rotating shafts 15 within these holes. To prevent wastewater leakage due to gaps between the rotating shafts 15 and the shaft holes, combined with… Figure 4 As shown, an annular sealing block 10 is fixed to the outer side of the shaft hole by screws. The sealing block 10 seals the gap between the rotating shaft 15 and the shaft hole. The sealing block 10 can be made of rubber.

[0064] In this embodiment, the sliding plate 13 is located on the upper side of the rotating plate 14. The sliding plate 13 is perpendicular to the rotating plate 14, and the bottom of the sliding plate 13 is slidably connected to the upper side of the rotating plate 14. The specific sliding method is as follows: combined with Figure 5 As shown, the upper side of the rotating plate 14 is provided with a T-shaped groove, and the bottom of the sliding plate 13 is integrally provided with a T-shaped slider 18, which is located in the groove. To prevent the slider 18 from sliding out of the end of the groove, the left and right ends of the rotating plate 14 in this embodiment ( Figure 2The sliding plate 13 is fixed with a sealing plate by screws in both directions, thereby sealing the end of the slide groove and preventing the slider 18 from sliding out of the end of the slide groove. The sliding plate 13 is located on the rotating plate 14 and will not detach.

[0065] In this embodiment, the lengths of the sliding plate 13 in the left-right direction, the rotating plate 14 in the left-right direction, the sliding plate 13 in the front-back direction, and the rotating plate 14 in the front-back direction are determined according to the actual size of the pool 1, and are not specifically limited in this embodiment.

[0066] Combination Figure 2 As shown, the barrier unit has a first static state. At this time, the rotating plates 14 of the four barrier components 16 are all tilted and tilted in the same direction. The right end of the rotating plate 14 is the low end and the left end of the rotating plate 14 is the high end. In the two adjacent barrier components 16, the sliding plate 13 of the left barrier component 16 abuts against the left end of the rotating plate 14 of the right barrier component 16.

[0067] Combination Figure 3 As shown, the barrier unit has a second static state. At this time, the rotating plates 14 of the multiple barrier components 16 are all tilted and tilted in the same direction. The left end of the rotating plate 14 is the low end and the right end of the rotating plate 14 is the high end. In two adjacent barrier components 16, the sliding plate 13 of the right barrier component 16 abuts against the right end of the rotating plate 14 of the left barrier component 16.

[0068] The blocking unit switches between a first static state and a second static state by rotating the rotating plate 14. In this embodiment, the rotating plate 14 is driven by: combining... Figure 4 As shown, each of the rotating shafts 15 located on the outer side of the pool body 1 is connected to a sprocket 17 via a spline. A chain connects the sprockets 17 in the rear row of the pool body 1, and a chain also connects the sprockets 17 in the front row of the pool body 1. A motor (not shown in the figure) for driving the rotating shafts 15 is also provided on the outer side of the pool body 1. The motor and one of the rotating shafts 15 are connected via a coupling. Thus, the motor drives the rotating shafts 15 to rotate, and multiple rotating shafts 15 rotate together through the transmission of the sprockets 17 and chains, thereby realizing the simultaneous rotation of multiple rotating plates 14 and enabling the switching between a first static state and a second static state of the blocking unit.

[0069] This embodiment also includes two sealing components, located on the left and right sides of the pool body 1 respectively. Each sealing component includes a rubber elastic band 11, a movable plate 12, and a drive rod 9 for driving the movable plate 12 to move laterally. The elastic band 11 is located above the movable plate 12, and the top end of the elastic band 11 is fixedly connected to the inner wall of the pool body 1 by screws, and the bottom end of the elastic band 11 is fixedly connected to the top end of the movable plate 12 by screws. The movable plates 12 on both sides of the pool body 1 are used to abut against the two ends of the barrier unit. Lateral rod holes are provided on both the left and right sides of the pool body 1, through which the drive rod 9 passes, and the drive rod 9 and the movable plate 12 are fixed by bolts. Simultaneously, combined with... Figure 3 , Figure 4 As shown, sealing blocks 10, which seal the gap between the rod hole and the drive rod 9, are also fixed to the outer sides of the left and right sides of the pool body 1 by screws. The sealing blocks 10 are annular and made of rubber. A cylinder (not shown in the figure) is provided on the outer side of the pool body 1 to drive the drive rod 9 to move left and right. Of course, the driving method for the lateral movement of the drive rod 9 is not limited to a cylinder; conventional mechanical driving methods such as hydraulic cylinders, electric cylinders, and rack and pinion drives can also be used.

[0070] In this embodiment, the front and rear ends of the sliding plate 13 and the front and rear ends of the rotating plate 14 are in contact with the front and rear inner walls of the pool body 1. The front and rear ends of the elastic band 11 are in contact with the front and rear inner walls of the pool body 1. The front and rear ends of the moving plate 12 are in contact with the front and rear inner walls of the pool body 1.

[0071] In some other embodiments, rubber sealing sheets are fixed to the outer surfaces of the sliding plate 13 and the rotating plate 14 by screws. This improves the sealing performance of the sliding plate 13 and the rotating plate 14 when they abut against each other. Simultaneously, it also improves the sealing performance between the front and rear ends of the sliding plate 13 and the inner wall of the pool body 1, and improves the sealing performance between the front and rear ends of the rotating plate 14 and the front and rear inner walls of the pool body 1.

[0072] In this embodiment, a circulation pipe 19 is installed on the upper side wall of the pool body 1. The circulation pipe 19 is connected to the water inlet pipe 4, and a pump 20 and a valve (not shown in the figure) are connected to the circulation pipe 19. The circulation pipe 19 is higher than the barrier unit, so when the circulation pipe 19 draws water from the pool body 1, it can reduce the agitation of the sediment on the barrier unit, and the sediment is more stable on the barrier unit.

[0073] The specific implementation process of this embodiment is as follows: The sludge settling tank in this embodiment has both primary and secondary sedimentation functions, and is applied in scenarios with a small wastewater treatment volume.

[0074] The specific process is as follows: Initially, combining... Figure 2As shown, assuming the blocking unit is in its first stationary state, the left movable plate 12 abuts against the left end of the leftmost rotating plate 14 of the blocking unit. The right movable plate 12 abuts against the right end of the rightmost sliding plate 13 of the blocking unit. Adjacent blocking components 16 abut against each other, thus the elastic band 11, movable plates 12, and blocking unit provide a blocking effect on the upper and lower parts 2. At the same time, the two movable plates 12 abut against both ends of the blocking unit, so the rotating plate 14 of the leftmost blocking component 16 cannot rotate to the left because it is abutted by the left movable plate 12, and the sliding plate 13 of the rightmost blocking component 16 cannot rotate to the right because it is abutted by the right movable plate 12. The entire blocking unit is in a stable stationary state.

[0075] An inlet valve is installed on the inlet pipe 4. Opening the inlet valve (while the valve on the circulation pipe 19 is closed) allows wastewater to be added to the sludge sedimentation tank 1 through the inlet pipe 4 and the vertical pipe 6. After the wastewater is added to the tank 1, the inlet valve is closed, preventing further wastewater from entering the tank 1. Initial sedimentation (setting) then occurs. At this time, the barrier unit is in its first static state, and the initially settled material falls onto the barrier unit at the bottom of the upper part. Since both ends of the barrier unit are abutting against the moving plate 12, and the sliding plate 13 and rotating plate 14 of the adjacent barrier assembly 16 are also abutting against each other, the barrier unit is in a stable, closed state and will not rotate automatically.

[0076] After initial settling, the left movable plate 12 moves to the left and the right movable plate 12 moves to the right, so that the movable plates 12 are no longer in contact with the end of the blocking unit. Then, the motor drives the rotating shaft to rotate, causing the blocking unit to rotate, that is, to... Figure 2 The blocking component 16 rotates counterclockwise around the rotating shaft 15. At this time, the blocking unit... Figure 2 The first state of rest becomes Figure 3 The second static state. During this state change, the rotating plate 14 rotates, the left end of the rotating plate 14 becomes lower and the right end becomes higher, the rotating plate 14 tilts to the other side, the adjacent barrier components 16 no longer abut against each other and have a gap, after the right end of the rotating plate 14 becomes higher, the sliding plate 13 slides downward on the rotating plate 14 under the action of gravity, thereby pushing the initial sediment on the rotating plate 14 downward, and the initial sediment enters the lower part 2 through the gap between the adjacent barrier components 16 and is collected.

[0077] When the blocking unit rotates to Figure 3After reaching a stationary state, the sliding plate 13 slides to the left end of the rotating plate 14, and the adjacent blocking components 16 are again in abutting position, making the blocking unit closed again. The blocking unit blocks the upper and lower parts 2. At the same time, the left movable plate 12 moves to the right, and the right movable plate 12 moves to the left, with the two movable plates 12 abutting against the two ends of the blocking unit, thereby closing the two ends of the blocking unit. The movable plates 12 abutting against the two ends of the blocking unit makes the blocking unit a stable stationary state.

[0078] Then, pump 20 is started. Pump 20 draws the liquid from the upper part of tank 1, after primary sedimentation, into circulation pipe 19. The liquid enters inlet pipe 4 and flows to the left, entering vertical pipe 6 and returning to tank 1. Simultaneously, phosphorus removal agent is added to vertical pipe 6 through dosing pipe 5, allowing the agent and wastewater to mix effectively. The phosphorus removal agent removes phosphorus-containing substances from the wastewater, reacting with them and settling downwards onto the barrier unit. Because the barrier unit separates the upper and lower parts 2, the phosphorus removal agent in the upper part does not enter the lower part 2 in large quantities and react with the primary sediment, thus preventing phosphorus removal from the primary sediment.

[0079] Furthermore, during the water intake process, because the circulation pipe 19 is higher than the barrier unit, it does not agitate the sediment on the barrier unit, allowing the sediment to remain stably on the barrier unit. Additionally, by controlling the power of the pump 20, the water intake of the circulation pipe 19 can be made more gentle, reducing the impact on the sediment on the barrier unit, allowing the sediment to remain stably settled on the barrier unit.

[0080] After the secondary phosphorus removal and sedimentation, the two moving plates 12 are moved to the sides again, and then the barrier unit is rotated. Figure 3 The rotating plate 14 rotates clockwise, and the blocking unit then rotates to... Figure 2 In the initial state. During this change process, the rotating plate 14 rotates, the right end of the rotating plate 14 swings downward and the left end swings upward, the rotating plate 14 tilts to the other side, and the adjacent blocking units 16 no longer abut against each other but have gaps. At the same time, the sliding plate 13 slides downward from left to right on the rotating plate 14 under the action of gravity, thereby pushing the secondary sediment on the rotating plate 14 downward. The sediment enters the lower part 2 through the gap between the adjacent blocking components 16 and is collected.

[0081] Then move the two movable plates 12 back to the two ends of the blocking unit and abut against the two ends of the blocking unit respectively.

[0082] In this way, after primary and secondary sedimentation, the wastewater in tank 1 is discharged through the sludge discharge pipe 3, where the primary and secondary sediments in the lower part 2 are discharged together. At the same time, the valve on the drain pipe is opened to discharge the liquid in the upper part into the equipment of the next wastewater treatment stage.

[0083] When the wastewater generated needs to be treated again using this sedimentation tank, it can be treated in the manner described in this embodiment.

[0084] Example 3

[0085] In this embodiment, the lower part 2 has a frustum-shaped sidewall, and the slag discharge pipe 3 is tangent to the sidewall of the lower part 2, so that the sediment in the lower part can more easily enter the slag discharge pipe and be discharged.

[0086] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A sludge sedimentation tank, characterized in that: Includes the pool body and the dosing device; The dosing device includes a vertical pipe, an inlet pipe, and a dosing pipe. The inlet pipe is connected to the side wall of the vertical pipe, and the outlet end of the inlet pipe is directly opposite the inner wall of the vertical pipe. The outlet end of the dosing pipe is located inside the vertical pipe, with the outlet end facing downwards, and is located above the outlet end of the inlet pipe. The vertical pipe is vertically inserted into the pool. The pool is equipped with a barrier unit that divides the pool into an upper part and a lower part, with the dosing device located in the upper part. The barrier unit includes multiple barrier components arranged horizontally. Each barrier component includes a rotating plate and a sliding plate. The ends of the rotating plate are rotatably connected to the pool, and the sliding plate is located on the upper side of the rotating plate. The sliding plate is perpendicular to the rotating plate, and its bottom is slidably connected to the upper side of the rotating plate. The barrier unit has a first static state, at which time the rotating plates of the multiple barrier components are all tilted and in the same direction; the right end of the rotating plate is the low end and the left end of the rotating plate is the high end; in two adjacent barrier components, the sliding plate of the left barrier component abuts against the left end of the rotating plate of the right barrier component. The barrier unit has a second static state, in which the rotating plates of the multiple barrier components are all tilted and tilted in the same direction; the left end of the rotating plate is the low end and the right end of the rotating plate is the high end; in two adjacent barrier components, the sliding plate of the right barrier component abuts against the right end of the rotating plate of the left barrier component. The blocking unit switches between a first static state and a second static state by rotating the rotating plate. It also includes two sealing components, which are located on the left and right sides of the pool body respectively. Each sealing component includes an elastic band, a movable plate, and a drive rod for driving the movable plate to move laterally. The elastic band is located above the movable plate, with its top end fixedly connected to the inner wall of the pool body and its bottom end fixedly connected to the movable plate. The movable plates on both sides of the pool body are used to abut against the two ends of the barrier unit.

2. The sludge sedimentation tank according to claim 1, characterized in that: The centerline of the outlet end of the dosing pipe coincides with the centerline of the vertical pipe, and the diameter of the outlet end of the dosing pipe is smaller than the diameter of the vertical pipe.

3. The sludge sedimentation tank according to claim 2, characterized in that: The outlet end of the water inlet pipe is located on the wall of the vertical pipe.

4. The sludge sedimentation tank according to claim 1, characterized in that: The vertical pipe has a hole in its wall, through which the dosing pipe passes. One end of the dosing pipe inside the vertical pipe is connected to an elbow, with the elbow's outlet facing downwards as the outlet end of the dosing pipe.

5. The sludge sedimentation tank according to claim 1, characterized in that: The vertical distance between the outlet end of the dosing pipe and the outlet end of the water inlet pipe is 5-20cm.

6. The sludge sedimentation tank according to claim 4, characterized in that: A sealing material is provided between the dosing tube and the inner wall of the tube hole.

7. The sludge sedimentation tank according to claim 1, characterized in that: The front and rear ends of multiple rotating plates are rotatably connected to the pool body via rotating shafts, and each rotating shaft is coaxially fixedly connected to a sprocket, with chains connecting the multiple sprockets.

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