A water treatment system for a high-density settling tank

Abstract

The utility model provides a kind of water treatment system of high-density sedimentation tank, the water treatment system includes sedimentation tank, inlet pipe, dosing unit;Sedimentation tank is provided with water inlet, is also equipped with effluent weir and sludge outlet;Multiple mutually spaced baffle plates are equipped in sedimentation tank, and multiple baffle plates divide the area between water inlet and effluent weir in the pool body inner cavity of sedimentation tank into water inlet area, mixing zone, flocculation zone, transition zone and sedimentation zone, and mixing zone and flocculation zone are communicated by pipeline;Water inlet is located in water inlet area, and effluent weir is located in sedimentation zone;Wherein, sedimentation zone includes mud scraper and inclined plate assembly arranged at bottom, and the bottom of inclined plate assembly is provided with flow guide wall adjacent to one side of transition zone, and inclined plate assembly includes upper and lower distribution inclined plate;Dosing unit includes first dosing assembly and second dosing assembly, which extends into water inlet area and flocculation zone respectively.The water treatment system of high-density sedimentation tank provided by the utility model improves the sedimentation efficiency and enhances the processing stability of the system.

Description

Technical Field

[0001] This utility model relates to the technical field of water treatment, specifically to a water treatment system for a high-density sedimentation tank. Background Technology

[0002] As the core component of high-density sedimentation tanks for solid-liquid separation, the flow pattern distribution within the sedimentation zone plays a decisive role in sedimentation efficiency. However, traditional sedimentation zone technology faces numerous challenges, specifically: turbulent flow patterns, such as short-circuiting and density currents, can cause flocs to be discharged with the water flow, significantly reducing sedimentation efficiency; sludge discharge is fraught with difficulties, with sludge outlets prone to clogging and low automation, heavily reliant on manual operation; furthermore, maintenance is quite complex, with inclined tubes or plates easily accumulating sludge, requiring frequent cleaning and increasing operation and maintenance costs.

[0003] The existing technical solutions and their drawbacks are as follows: Inclined tube sedimentation zone (e.g., the technology used in some utility model patents): Its structure typically uses hexagonal inclined tubes with a 60° inclination angle, equipped with a sludge scraping mechanism. However, the disadvantage is that the fixed inclination angle cannot adapt to changes in different water qualities, and sludge easily accumulates in the gaps between the inclined tubes. Central sedimentation tank: Performance is improved by optimizing the water flow direction and setting up a sludge return system. However, its baffle design is relatively simple, easily causing density currents; at the same time, the sludge thickening effect is not satisfactory. Mainstream industry solutions (such as Actiflo technology): Utilize micro-sand circulation to promote flocculation and set up an inclined tube sedimentation zone. However, the drawback is that the flow pattern in the sedimentation zone is not optimized, and sludge discharge still relies on traditional sludge scrapers, which are prone to clogging.

[0004] As mentioned above, the design of fixed-angle inclined tubes and simple baffles easily leads to turbulent flow, resulting in short-circuiting and density flow phenomena. This causes flocs to be directly discharged with the water flow, thereby reducing sedimentation efficiency and increasing SS in the effluent. This necessitates the addition of a filtration unit, increasing treatment costs. At the same time, traditional sludge scrapers need to be started and stopped at regular intervals, and the sludge hopper is prone to clogging, making continuous sludge discharge impossible. This causes sludge layer fluctuations, affecting the sedimentation effect, and manual operation increases labor intensity. In addition, the gaps between the inclined tubes and the fixed-angle design easily accumulate sludge, requiring regular backwashing or manual cleaning. Frequent maintenance and long downtime severely affect the continuity of treatment. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model aims to provide a water treatment system with a high-density sedimentation tank, which improves sedimentation efficiency while enhancing the system's treatment stability.

[0006] In order to achieve the purpose of this utility model, the following technical solution is adopted:

[0007] This utility model provides a water treatment system for a high-density sedimentation tank. The water treatment system includes a sedimentation tank, an inlet pipe for conveying wastewater to be sedimented into the sedimentation tank, and a dosing unit. The sedimentation tank is provided with an inlet connected to the inlet pipe, and is also provided with an outlet weir for discharging the clear liquid on the upper layer of the sedimentation tank and an outlet for discharging the sludge at the bottom of the sedimentation tank.

[0008] The sedimentation tank has multiple baffles arranged at intervals inside its internal cavity. These baffles sequentially divide the internal cavity of the sedimentation tank between the inlet and the outlet weir into an inlet zone, a mixing zone, a flocculation zone, a transition zone, and a sedimentation zone. The baffles between the inlet zone and the mixing zone, the flocculation zone and the transition zone, and the transition zone and the sedimentation zone each have connecting openings. The bottoms of the mixing zone and the flocculation zone are connected by a pipe. The inlet is located in the inlet zone, and the outlet weir is located at the top of the sedimentation zone. The sedimentation zone includes a sludge scraper at the bottom and an inclined plate assembly above the sludge scraper. A guide wall is provided on the bottom side of the inclined plate assembly adjacent to the transition zone. The inclined plate assembly includes an upper inclined plate and a lower inclined plate distributed vertically.

[0009] The dosing unit includes a first dosing component and a second dosing component, the first dosing component extending into the inlet water zone and the second dosing component extending into the flocculation zone.

[0010] In the water treatment system of the high-density sedimentation tank provided by this utility model, in the inclined plate assembly, the inclination angle of the upper inclined plate is 55° to 60°, and the inclination angle of the lower inclined plate is 50° to 55°.

[0011] The spacing between the upper inclined plates is 2% to 5% greater than that between the lower inclined plates;

[0012] A self-cleaning unit is also provided above the inclined plate assembly for spraying cleaning water onto the inclined plate assembly.

[0013] In the water treatment system of the high-density sedimentation tank provided by this utility model, the effluent weir is arranged above the inclined plate assembly;

[0014] The outlet weir is an outlet with a sawtooth structure, the height of the sawtooth is 50-100mm, and the spacing of the sawtooth is 200-300mm.

[0015] An emergency overflow weir is also provided on the side wall of the sedimentation zone and above the outlet weir.

[0016] In the water treatment system of the high-density sedimentation tank provided by this utility model, the top of the baffle located between the inlet zone and the mixing zone is provided with the communication port for connecting the inlet zone and the mixing zone;

[0017] The bottom of the baffle located between the flocculation zone and the transition zone is provided with the communication port for connecting the flocculation zone and the transition zone;

[0018] The baffle located between the transition zone and the sedimentation zone has a communication port at its top, which is used to connect the transition zone and the sedimentation zone.

[0019] In the water treatment system of the high-density sedimentation tank provided by this utility model, the height of the baffle between the transition zone and the sedimentation zone reaches 1 / 2 to 3 / 4 of the height of the inclined plate assembly in the vertical direction.

[0020] The downward extension distance of the guide wall is 2 / 3 to 1 / 2 of the vertical height of the inclined plate assembly.

[0021] In the water treatment system of the high-density sedimentation tank provided by this utility model, a guide hole is provided on the baffle between the transition zone and the sedimentation zone, and the diameter of the guide hole is 5-20mm.

[0022] The porosity of the guide holes on the baffle plate increases from 15%–20% to 30%–40% from bottom to top.

[0023] In the water treatment system of the high-density sedimentation tank provided by this utility model, a steep slope is provided at the bottom of the transition zone, the upper end of the steep slope abuts against the baffle between the transition zone and the sedimentation zone, and the lower end of the steep slope is fixed to the bottom of the transition zone.

[0024] The steep slope forms a 60° to 70° angle with the bottom of the sedimentation zone.

[0025] In the water treatment system of the high-density sedimentation tank provided by this utility model, the bottom of the sedimentation zone is provided with an aeration perforated pipe for aeration into the sedimentation tank to enhance the fluidity of the sludge.

[0026] The flocculation zone is equipped with a guide tube that is open at both the top and bottom, and a lifting agitator is installed inside the guide tube.

[0027] In the water treatment system of the high-density sedimentation tank provided by this utility model, a sludge tank is provided at the bottom of the sedimentation zone, and the sludge outlet is opened at the bottom of the sludge tank.

[0028] The ratio of the width of the sludge tank to the bottom width of the sedimentation zone is 1:4 to 1:3, and the slope of the sludge tank is 10° to 15°.

[0029] In the water treatment system of the high-density sedimentation tank provided by this utility model, the water treatment system further includes a sludge treatment unit, which includes a sludge density detector, a sludge interface meter, a sludge return pump, and a sludge discharge pump.

[0030] The sludge density detector is installed at the bottom of the sedimentation zone to measure the sludge density at different depths in the sedimentation zone.

[0031] The sludge interface meter is installed inside the sedimentation zone to measure the sludge height within the sedimentation zone.

[0032] The sludge outlet at the bottom of the sedimentation zone is connected to a return pipe and a sludge discharge pipe. The other end of the return pipe is connected to the flocculation zone so that the sludge at the bottom of the sedimentation zone can be reused in the flocculation zone. The other end of the sludge discharge pipe is connected to the outside of the boundary.

[0033] The sludge return pump is installed on the return pipe, and the sludge discharge pump is installed on the discharge pipe.

[0034] The technical solution provided by this utility model has the following beneficial effects:

[0035] This utility model provides a water treatment system that adopts a double-layer staggered baffle design between the transition zone and the sedimentation tank, which can force the water flow to flow along a predetermined path and effectively eliminate short-flow and multiple-flow phenomena.

[0036] In the water treatment system provided by this utility model, the inclined plate assembly above the sedimentation zone is divided into upper and lower layers. The variable angle inclined plate design significantly enhances the sedimentation effect. At the same time, the self-cleaning unit above the inclined plate assembly can periodically generate reverse water flow to flush the inclined plate assembly, which can effectively prevent the accumulation of mud between the inclined plates. Attached Figure Description

[0037] Figure 1 This utility model provides a specific embodiment of a water treatment system for a high-density sedimentation tank.

[0038] Figure 2 : Figure 1 A partial structural diagram of the inclined plate assembly shown;

[0039] The components include: 1. Inlet, 2. Inclined plate assembly, 3. Emergency overflow weir, 4. Aeration perforated pipe, 5. Self-cleaning unit, 6. Outlet weir, 7. Sludge tank, 8. Sludge scraper, 9. Sludge return pump, 10. Sludge density meter, 11. Sludge interface meter, 12. First dosing assembly, 13. Second dosing assembly, 14. Sludge outlet, 15. Guide wall, 16. Guide hole, 17. Steep slope, and 18. Sludge discharge pump. Detailed Implementation

[0040] The specific embodiments of this utility model are described in detail below. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0042] This invention provides a water treatment system for a high-density sedimentation tank, such as... Figure 1 As shown, the system includes a sedimentation tank, an inlet pipe for conveying wastewater to be settled into the sedimentation tank, and a dosing unit. The sedimentation tank is equipped with an inlet 1 connected to the inlet pipe, an outlet weir 6 for discharging the clear liquid from the upper layer of the sedimentation tank, and a sludge outlet 14 for discharging the sludge from the bottom of the sedimentation tank. The sedimentation tank's internal cavity is equipped with multiple baffles arranged at intervals, which sequentially divide the area between the inlet 1 and the outlet weir 6 into an inlet zone, a mixing zone, a flocculation zone, a transition zone, and a sedimentation zone. The baffles between the inlet zone and the mixing zone, the flocculation zone and the transition zone, and the transition zone and the sedimentation zone are each provided with connecting openings. The bottom of the mixing zone and the flocculation zone are connected by a pipe. The inlet 1 is located in the inlet zone, and the outlet weir 6 is located at the top of the sedimentation zone for discharging treated wastewater to the outside.

[0043] In some embodiments, the top of the baffle located between the water inlet zone and the mixing zone is provided with a communication port for connecting the water inlet zone and the mixing zone; the bottom of the baffle located between the flocculation zone and the transition zone is provided with a communication port for connecting the flocculation zone and the transition zone; and the top of the baffle located between the transition zone and the sedimentation zone is provided with a communication port for connecting the transition zone and the sedimentation zone.

[0044] In the water treatment system provided by this utility model, the sedimentation zone includes a sludge scraper 8 at the bottom and an inclined plate assembly 2 above the sludge scraper 8. A guide wall 15 is provided on the side of the bottom of the inclined plate assembly 2 adjacent to the transition zone. The inclined plate assembly 2 includes an upper inclined plate and a lower inclined plate distributed vertically. In some embodiments, the inclination angle of the upper inclined plate is 55° to 60°, and the inclination angle of the lower inclined plate is 50° to 55°. Specifically, the plate spacing of the upper inclined plate is increased by 2% to 5% compared to the lower inclined plate. The sedimentation effect of the inclined plate assembly 2 is enhanced by the differential setting of the plate spacing.

[0045] In some preferred embodiments, a self-cleaning unit 5 is provided above the inclined plate assembly 2 for spraying cleaning water into the inclined plate assembly 2 and rinsing the surface of each inclined plate in the assembly by periodically reverse water flow. The rinsing cycle can be adjusted to a range of 12-24 hours.

[0046] In some embodiments, the outlet weir 6 is positioned above the inclined plate assembly 2; specifically, the outlet weir 6 is an outlet with a sawtooth structure, the height of the sawtooth is 50-100mm, and the spacing of the sawtooth is 200-300mm. In some more specific embodiments, an emergency overflow weir 3 is also provided on the side wall of the sedimentation zone and above the outlet weir 6. This overflow weir can be opened when the water level of the system exceeds the normal water level by 100mm to ensure the safe operation of the system.

[0047] In some embodiments, the height of the baffle between the transition zone and the sedimentation zone reaches 1 / 2 to 3 / 4 of the vertical height of the inclined plate assembly 2; the downward extension distance of the guide wall 15 is 2 / 3 to 1 / 2 of the vertical height of the inclined plate assembly 2. The staggered distribution of the baffle and guide wall 15 between the transition zone and the sedimentation zone can reduce the degree of effluent turbulence, prevent floc breakage during the process, and ensure that large floc particles settle to the bottom of the tank, thereby ensuring effective separation of mud and water.

[0048] In some embodiments, a guide hole 16 is provided on the baffle between the transition zone and the sedimentation zone. When the water in the transition zone flows to the baffle, some of the water can enter the sedimentation zone through the guide hole 16 on the baffle. Specifically, the diameter of the guide hole 16 is 5 to 20 mm. More specifically, the porosity of the guide hole 16 on the baffle increases from 15% to 20% to 30% to 40% from bottom to top.

[0049] In some embodiments, a steep slope 17 is provided at the bottom of the transition zone in front of the baffle between the transition zone and the sedimentation zone. The upper end of the steep slope 17 is fixedly attached to the baffle between the transition zone and the sedimentation zone, and the lower end of the steep slope 17 is fixed to the bottom of the transition zone. Preferably, the steep slope 17 is at an angle of 60° to 70° with the bottom of the sedimentation zone to prevent flocs from colliding with the pool wall and settling at the bottom of the transition zone, thus forming a dead corner.

[0050] In some implementations, an aeration perforated pipe 4 is provided at the bottom of the sedimentation zone to enhance the fluidity of sludge in the sedimentation tank through aeration, thereby preventing excessive deposition and blockage of sludge at the bottom or in the sludge tank 7.

[0051] In some embodiments, a sludge trough 7 is provided at the bottom of the sedimentation zone, and a sludge outlet 14 is opened at the bottom of the sludge trough 7; in some specific embodiments, the ratio of the width of the sludge trough 7 to the bottom width of the sedimentation zone is 1:4 to 1:3, and the slope of the sludge trough 7 is 10° to 15°.

[0052] In some implementations, a guide tube is used for flocculation within the flocculation zone. This guide tube is open at both the top and bottom, and a liftable agitator is installed inside. The effective synergy between the agitator and the guide tube allows for rapid flocculation of the water within the guide tube, while the water flow velocity decreases outside the guide tube, ensuring a high density of flocs in the flocculation zone. Specifically, during the treatment process, the agitation by the agitator within the guide tube in the flocculation zone causes movement and mixing of the surrounding fluids, resulting in a uniform flow velocity distribution within the guide tube and enhancing the coagulation effect.

[0053] In the water treatment system provided by this utility model, the main function of the transition zone is to allow the flocculation zone and the sedimentation zone to combine naturally and smoothly, so that the flocculated water can be evenly and stably immersed into the sedimentation zone.

[0054] The water treatment system provided by this utility model includes a first dosing component 12 and a second dosing component 13. The first dosing component 12 extends into the inlet water zone and is used to add flocculant and pH adjuster into the inlet water zone. The second dosing component 13 extends into the flocculation zone to add coagulant aid into the flocculation zone.

[0055] In some embodiments, the water treatment system further includes a sludge treatment unit, which includes a sludge density meter 10, a sludge interface meter 11, a sludge return pump 9, and a sludge discharge pump 18.

[0056] The sludge density detector 10 is installed at the bottom of the sedimentation zone to measure the sludge density at different depths in the sedimentation zone.

[0057] The sludge interface meter 11 is installed inside the sedimentation zone to measure the sludge height within the sedimentation zone;

[0058] The sludge outlet 14 at the bottom of the sedimentation zone is connected to a return pipe and a sludge discharge pipe. The other end of the return pipe is connected to the flocculation zone so as to reuse the sludge at the bottom of the sedimentation zone to the flocculation zone. The other end of the sludge discharge pipe is connected to the outside of the boundary.

[0059] Preferably, the sludge return pump 9 is installed on the return pipe, and the sludge discharge pump 18 is installed on the discharge pipe.

[0060] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. The structures, proportions, sizes, etc., illustrated in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0061] Meanwhile, the terms “front,” “rear,” “left,” “right,” “up,” and “down” used in this specification refer to the directions in the accompanying drawings, and the terms “inner” and “outer” refer to the directions toward or away from the geometric center of a specific component, respectively. The above terms are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0062] Example

[0063] The water treatment system provided by this utility model includes:

[0064] The sedimentation tank includes an inlet pipe for conveying wastewater to be settled into the sedimentation tank and a dosing unit. The sedimentation tank is equipped with an inlet 1 connected to the inlet pipe, and also has an outlet weir for discharging the clear liquid at the top of the sedimentation tank and an outlet 14 for discharging the sludge at the bottom of the sedimentation tank.

[0065] like Figure 1 As shown, the sedimentation tank has multiple baffles arranged at intervals inside its internal cavity. These baffles sequentially divide the area between the inlet 1 and the outlet weir into (i.e., along the water flow direction) an inlet zone, a mixing zone, a flocculation zone, a transition zone, and a sedimentation zone. The inlet 1 is located on the side wall of the inlet zone to supply the system with water to be treated; the outlet weir 6 is located at the top of the sedimentation zone to allow the treated water to flow out of the system.

[0066] Specifically, the baffles between the inlet zone and the mixing zone, the baffles between the flocculation zone and the transition zone, and the baffles between the transition zone and the sedimentation zone are all equipped with connecting ports. The connecting port on the baffle between the flocculation zone and the transition zone is located at the bottom, while the other connecting ports are located at the top. The mixing zone and the flocculation zone are connected by a pipe at the bottom.

[0067] Specifically, a guide tube with openings at both the top and bottom is installed within the flocculation zone, and a lifting agitator is installed inside the guide tube. The effective synergy between the agitator and the guide tube allows for rapid flocculation of the water within the guide tube, while the water flow velocity decreases outside the guide tube, ensuring a high density of flocs in the flocculation zone. During the treatment process, the agitation by the agitator within the guide tube in the flocculation zone causes movement and mixing of the surrounding fluids, resulting in a uniform flow velocity distribution within the guide tube and enhancing the coagulation effect.

[0068] The sedimentation zone includes a sludge scraper 8 located at the bottom of the sedimentation zone and an inclined plate assembly 2 located above the sludge scraper 8. The bottom of the sedimentation zone is equipped with an aeration perforated pipe 4 and a sludge trough 7. The aeration perforated pipe 4 is used to aerate the sedimentation tank to enhance the fluidity of the sludge. The bottom of the sludge trough 7 has a sludge outlet 14 for discharging sludge. Specifically, the ratio of the width of the sludge trough 7 to the bottom width of the sedimentation zone is 1:4 to 1:3, and the slope of the sludge trough 7 is 10° to 15°.

[0069] like Figure 2 As shown, in the sedimentation zone, a guide wall 15 is provided at the bottom of the inclined plate assembly 2 adjacent to the transition zone. The inclined plate assembly 2 includes an upper inclined plate and a lower inclined plate distributed vertically. Specifically, the inclination angle of the upper inclined plate is any angle between 55° and 60°, and the inclination angle of the lower inclined plate is any angle between 50° and 55°. The spacing between the upper and lower inclined plates is increased by 2% to 5%, and this variable-angle double-layer inclined plate design significantly enhances the sedimentation effect. More specifically, a self-cleaning unit 5 is also provided above the inclined plate assembly 2 to spray cleaning water in the reverse direction onto the inclined plates inside the inclined plate assembly 2, which can effectively prevent the accumulation of mud between the inclined plates.

[0070] In this water treatment system, the effluent weir 6 is located at the top of the sedimentation zone and above the inclined plate assembly 2. Specifically, the effluent weir 6 is an outlet with a sawtooth structure, the height of the sawtooth is any value between 50 and 100 mm, and the spacing of the sawtooth is any spacing between 200 and 300 mm. More specifically, an emergency overflow weir 3 is also provided on the side wall of the sedimentation zone and above the effluent weir 6. When the water level of the system exceeds the normal water level by 100 mm, the overflow weir can be opened to ensure the safe operation of the system.

[0071] Specifically, the height of the baffle between the transition zone and the sedimentation zone is 1 / 2 to 3 / 4 of the vertical height of the inclined plate assembly 2; the downward extension distance of the guide wall 15 is 2 / 3 to 1 / 2 of the vertical height of the inclined plate assembly 2, so that a double-layer staggered baffle design is formed between the transition zone and the sedimentation tank, which can force the water flow to flow along a predetermined path, effectively eliminating the phenomenon of short flow and density flow that causes the water to fall vertically and impact the sludge layer at the bottom of the tank, and carrying out the settled flocs, thus improving the sedimentation effect.

[0072] A guide hole 16 with a diameter of 5 to 20 mm is provided on the baffle between the transition zone and the sedimentation zone. Preferably, the porosity of the guide hole 16 increases from 15% to 20% to 30% to 40% along the water flow direction, thereby reducing the outflow velocity.

[0073] Specifically, such as Figure 1As shown, a steep slope 17 is provided at the bottom of the transition zone in front of the baffle between the transition zone and the sedimentation zone. The upper end of the steep slope 17 is fixedly attached to the baffle between the transition zone and the sedimentation zone, and the lower end of the steep slope 17 is fixed to the bottom of the transition zone. Preferably, the steep slope 17 is at a 60° to 70° angle to the bottom of the sedimentation zone to prevent flocs from colliding with the pool wall and settling at the bottom of the transition zone, thus forming a dead corner.

[0074] The dosing unit includes a first dosing component 12 and a second dosing component 13. The first dosing component 12 extends into the inlet water zone to add flocculant to the inlet water zone; the second dosing component 13 extends into the flocculation zone to add coagulant aid to the flocculation zone.

[0075] The water treatment system also includes a sludge treatment unit, which includes a sludge density meter 10, a sludge interface meter 11, a sludge return pump 9, and a sludge discharge pump 18. The sludge density meter 10 is located at the bottom of the sedimentation zone to measure the sludge density at different depths within the sedimentation zone. The sludge interface meter 11 is located inside the sedimentation zone to measure the sludge height within the sedimentation zone. The sludge outlet 14 at the bottom of the sedimentation zone connects to a return pipe and a sludge discharge pipe. The other end of the return pipe connects to the flocculation zone to reuse the sludge at the bottom of the sedimentation zone. The other end of the sludge discharge pipe connects to the outside. Preferably, the return pipe is equipped with the sludge return pump 9, and the sludge discharge pipe is equipped with the sludge discharge pump 18 to achieve continuous and efficient sludge circulation and discharge.

Claims

1. A water treatment system with a high-density sedimentation tank, characterized in that, The water treatment system includes a sedimentation tank, an inlet pipe for conveying wastewater to be sedimented into the sedimentation tank, and a dosing unit; the sedimentation tank is provided with an inlet connected to the inlet pipe, and is also provided with an outlet weir for discharging the clear liquid on the upper layer of the sedimentation tank and an outlet for discharging the sludge at the bottom of the sedimentation tank. The sedimentation tank has multiple baffles arranged at intervals inside its internal cavity. These baffles sequentially divide the internal cavity of the sedimentation tank between the inlet and the outlet weir into an inlet zone, a mixing zone, a flocculation zone, a transition zone, and a sedimentation zone. The baffles between the inlet zone and the mixing zone, the flocculation zone and the transition zone, and the transition zone and the sedimentation zone each have connecting openings. The bottoms of the mixing zone and the flocculation zone are connected by a pipe. The inlet is located in the inlet zone, and the outlet weir is located at the top of the sedimentation zone. The sedimentation zone includes a sludge scraper at the bottom and an inclined plate assembly above the sludge scraper. A guide wall is provided on the bottom side of the inclined plate assembly adjacent to the transition zone. The inclined plate assembly includes an upper inclined plate and a lower inclined plate distributed vertically. The dosing unit includes a first dosing component and a second dosing component, the first dosing component extending into the inlet water zone and the second dosing component extending into the flocculation zone.

2. The water treatment system for a high-density sedimentation tank according to claim 1, characterized in that, In the inclined plate assembly, the inclination angle of the upper inclined plate is 55° to 60°, and the inclination angle of the lower inclined plate is 50° to 55°. The spacing between the upper inclined plates is 2% to 5% greater than that between the lower inclined plates; A self-cleaning unit is also provided above the inclined plate assembly for spraying cleaning water onto the inclined plate assembly.

3. The water treatment system for the high-density sedimentation tank according to claim 2, characterized in that, The outlet weir is positioned above the inclined plate assembly; The outlet weir is an outlet with a sawtooth structure, the height of the sawtooth is 50-100mm, and the spacing of the sawtooth is 200-300mm. An emergency overflow weir is also provided on the side wall of the sedimentation zone and above the outlet weir.

4. The water treatment system for a high-density sedimentation tank according to claim 3, characterized in that, The top of the baffle located between the water inlet zone and the mixing zone is provided with the communication port for connecting the water inlet zone and the mixing zone; The bottom of the baffle located between the flocculation zone and the transition zone is provided with the communication port for connecting the flocculation zone and the transition zone; The baffle located between the transition zone and the sedimentation zone has a communication port at its top, which is used to connect the transition zone and the sedimentation zone.

5. The water treatment system for a high-density sedimentation tank according to claim 4, characterized in that, The height of the baffle between the transition zone and the sedimentation zone reaches 1 / 2 to 3 / 4 of the height of the inclined plate assembly in the vertical direction; The downward extension distance of the guide wall is 2 / 3 to 1 / 2 of the vertical height of the inclined plate assembly.

6. The water treatment system for a high-density sedimentation tank according to claim 5, characterized in that, A flow guide hole is provided on the baffle between the transition zone and the sedimentation zone, and the diameter of the flow guide hole is 5-20 mm. The porosity of the guide holes on the baffle plate increases from 15%–20% to 30%–40% from bottom to top.

7. The water treatment system for a high-density sedimentation tank according to claim 6, characterized in that, The bottom of the transition zone is provided with a steep slope, the upper end of which abuts against a baffle between the transition zone and the sedimentation zone, and the lower end of which is fixed to the bottom of the transition zone. The steep slope forms a 60° to 70° angle with the bottom of the sedimentation zone.

8. The water treatment system for a high-density sedimentation tank according to claim 7, characterized in that, The bottom of the sedimentation zone is equipped with an aeration perforated pipe for aeration into the sedimentation tank to enhance the fluidity of the sludge. The flocculation zone is equipped with a guide tube that is open at both the top and bottom, and a lifting agitator is installed inside the guide tube.

9. The water treatment system for a high-density sedimentation tank according to claim 8, characterized in that, The bottom of the sedimentation zone is provided with a sludge tank, and the bottom of the sludge tank is provided with the sludge outlet. The ratio of the width of the sludge tank to the bottom width of the sedimentation zone is 1:4 to 1:3, and the slope of the sludge tank is 10° to 15°.

10. The water treatment system for a high-density sedimentation tank according to any one of claims 1 to 9, characterized in that, The water treatment system also includes a sludge treatment unit, which includes a sludge density meter, a sludge interface meter, a sludge return pump, and a sludge discharge pump. The sludge density detector is installed at the bottom of the sedimentation zone to measure the sludge density at different depths in the sedimentation zone. The sludge interface meter is installed inside the sedimentation zone to measure the sludge height within the sedimentation zone. The sludge outlet at the bottom of the sedimentation zone is connected to a return pipe and a sludge discharge pipe. The other end of the return pipe is connected to the flocculation zone so that the sludge at the bottom of the sedimentation zone can be reused in the flocculation zone. The other end of the sludge discharge pipe is connected to the outside of the boundary. The sludge return pump is installed on the return pipe, and the sludge discharge pump is installed on the discharge pipe.

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