High-density sedimentation tank

Abstract

The utility model provides a high-density sedimentation tank, which comprises: a first tank for receiving a fluid to be treated and performing coagulation and / or flocculation treatment on the fluid to be treated; the second tank is in fluid communication with the first tank so as to receive the treatment fluid from the first tank and perform concentration treatment on the treatment fluid; the third tank is in fluid communication with the second tank so as to receive the treatment fluid from the second tank and perform precipitation treatment on the treatment fluid; and a transition zone in fluid communication with the first and second pools, respectively, for conveying a treatment fluid, where the second and third pools are arranged side by side in a first direction, and the transition zone extends in a second direction perpendicular to the first direction, the first and second pools are disposed between the first and second pools in a first direction.

Description

Technical Field

[0001] The present disclosure relates to a high-density sedimentation tank. Background Art

[0002] High-density sedimentation tanks are advanced water treatment devices that offer the advantages of free settling, inclined tube sedimentation, sludge return contact flocculation, and sludge concentration. They can be integrated with coagulation and flocculation tank systems. For example, high-density sedimentation tanks can be constructed of concrete or metal.

[0003] A high-density sedimentation tank primarily consists of an average inlet system, a coagulation tank system, a flocculation tank system, a sedimentation tank system, and a sludge system. The main body of a conventional high-density sedimentation tank is actually composed of two stacked sections: an upper inclined tube sedimentation zone and a lower sludge concentration zone. These two sections correspond to the sedimentation tank system and sludge system, respectively.

[0004] The sludge thickening zone uses gravity thickening, so sufficient thickening time is required to achieve the desired thickening effect. Typically, the residence time of the wastewater in the sludge thickening zone or thickening tank is around 12 hours. In other words, the sludge thickening zone or thickening tank must be sufficiently large. Given a given cross-sectional area, a sufficiently large thickening volume naturally requires a relatively high height. Because the sedimentation and thickening zones are stacked one above the other, a buffer layer at least 0.5 meters high is typically required between the two zones to prevent water flow from affecting the thickening effect. Consequently, the typical height of the sludge thickening zone or thickening tank is over 2-3 meters. Similarly, the inclined tube sedimentation zone also requires sufficient height. For example, the inlet area of ​​the inclined tube sedimentation zone requires a height of approximately 1 meter, the distribution area at the bottom of the inclined tube sedimentation zone requires a height of approximately 0.5 meters, and the inclined tube area of ​​the inclined tube sedimentation zone is approximately 1.5 meters high. Therefore, the total height of the inclined tube sedimentation zone reaches 2-3 meters. Taken together, the height of a traditional high-density sedimentation tank is at least 5-6 meters.

[0005] Such high heights hinder the application of high-density sedimentation tanks. For example, when using steel high-density sedimentation tanks, a height of 5-6 meters exceeds the transportation height limit of most roads. Therefore, either on-site processing is required or transportation costs are high. For example, when high-density sedimentation tanks are used in indoor or underground scenarios, the clear height of the factory building is usually 5-6 meters, and the door height is about 4 meters. Therefore, high-density sedimentation tanks with a height of more than 5-6 meters cannot be deployed indoors or underground.

[0006] Therefore, there is a need in the art for a high-density sedimentation tank that can solve the above problems. Utility Model Content

[0007] Therefore, the purpose of the present disclosure is to provide a high-density sedimentation tank, which uses a concentrating tank and a sedimentation tank arranged side by side, reduces the height of the equipment, has a simple and compact structure, and is easy to process and transport.

[0008] The above objectives are achieved by the high-density sedimentation tank described below.

[0009] The present disclosure provides a high-density sedimentation tank, which includes: a first tank, receiving a fluid to be treated and performing coagulation and / or flocculation treatment on the fluid to be treated; a second tank, fluidically connected to the first tank to receive a treated fluid from the first tank and perform concentration treatment on the treated fluid; a third tank, fluidically connected to the second tank to receive a treated fluid from the second tank and perform sedimentation treatment on the treated fluid; and a transition zone, fluidically connected to the first tank and the second tank respectively and used to transport the treated fluid, wherein the second tank and the third tank are arranged side by side in a first direction, and the transition zone extends along a second direction perpendicular to the first direction, and is located between the first tank and the second tank in the first direction.

[0010] In one embodiment, the transition zone includes an inlet end and an outlet end opposite to each other in the second direction, and a first baffle is provided at the inlet end and / or the outlet end.

[0011] In one embodiment, the transition zone is formed by a pool wall of the first pool and a pool wall of the second pool, the inlet end is arranged at the bottom of the first pool, and the outlet end is arranged at the top of the second pool.

[0012] In one embodiment, the second tank and the third tank are separated by a common partition wall.

[0013] In one embodiment, at least a portion of the second tank and / or the third tank has a square or rectangular cross-section perpendicular to the height direction thereof.

[0014] In one embodiment, the second tank includes a concentration zone and a flat flow zone located above the concentration zone, wherein the concentration zone is provided with a sludge scraping device.

[0015] In one embodiment, a second baffle is provided in the advection region of the second pool, and the second baffle extends from the top of the second pool along the second direction.

[0016] In one embodiment, the bottom of the concentrating zone of the second tank has a circular cross-sectional shape.

[0017] In one embodiment, a corner of the concentration zone of the second tank is provided with an arc-shaped inclined portion extending from the bottom surface of the second tank toward the tank wall of the second tank.

[0018] In one embodiment, the bottom surface is located in the center of the second tank, and the sludge scraping device is provided on the bottom surface.

[0019] In one embodiment, the horizontal flow area of ​​the second tank can be provided with a lateral flow inclined plate assembly, and the lateral flow inclined plate assembly includes a plurality of lateral flow inclined plates arranged parallel to each other.

[0020] In one embodiment, the lateral flow inclined plate assembly is a straight-through lateral flow inclined plate assembly.

[0021] In one embodiment, the advection zone of the second pool can be provided with an inlet straightening device and / or an outlet straightening device.

[0022] In one embodiment, the third tank includes a sedimentation area, an inlet area located above the sedimentation area, and a water outlet area located above the water inlet area, wherein the sedimentation area is provided with a plurality of mud buckets, and the water outlet area is provided with an inclined pipe device.

[0023] In one embodiment, the high-density sedimentation tank further comprises a sludge return device, one end of the sludge return device is in fluid communication with the second tank, and the other end of the sludge return device is in fluid communication with the first tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The advantages and purposes of the present disclosure can be better understood from the following detailed description of the preferred embodiments of the present disclosure in conjunction with the accompanying drawings. In order to better illustrate the relationship between the various components in the accompanying drawings, the accompanying drawings are not drawn to scale. In the accompanying drawings:

[0025] Figure 1 A schematic diagram of a high-density sedimentation tank according to an embodiment of the present disclosure is shown, wherein the curved arrows in the tank body schematically illustrate the flow direction of the fluid;

[0026] Figure 2 A schematic diagram of a high-density sedimentation tank according to another embodiment of the present disclosure is shown, wherein the curved arrows in the tank body schematically illustrate the flow direction of the fluid;

[0027] Figure 3 A schematic diagram showing the bottom of a second tank of a high-density sedimentation tank according to one embodiment of the present disclosure is shown;

[0028] Figure 4 A schematic diagram of a high-density sedimentation tank according to another embodiment of the present disclosure is shown. Figure 1 and 2 Comparison of the schematic diagrams of the high-density sedimentation tank shown in ;

[0029] Figure 5 A partial schematic diagram of a high-density sedimentation tank according to one embodiment of the present disclosure is shown;

[0030] Figure 6 A partial schematic diagram of a lateral flow inclined plate assembly provided in a high-density sedimentation tank according to one embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present disclosure. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0032] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar terms used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not necessarily indicate a quantity limitation. Words such as "include", "comprise" or "have" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connected" or "connected" are not limited to the physical or mechanical connections or connections shown in the drawings, but may include equivalent connections or connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] See below. Figures 1 to 6 Embodiments of the present disclosure are described in detail.

[0034] The high-density sedimentation tank according to the present disclosure may include an average water inlet system, a coagulation tank system, a flocculation tank system, a sedimentation tank system, and a sludge system.

[0035] The average inlet system features an on / off function, ensuring that the high-density sedimentation tank can be isolated for maintenance and overhaul. Furthermore, the average inlet system should evenly distribute flow. When operating several high-density sedimentation tanks in parallel, the average inlet system is required to evenly distribute flow across the tanks.

[0036] The coagulation tank system includes a coagulation agitator. Under the action of the coagulation agitator, the coagulant and the influent are thoroughly mixed and reacted, transforming extremely fine, difficult-to-settle particles in the water into stable, sedimentable flocs. At the same time, other pollutants in the water are adsorbed by the flocs and can be removed in subsequent processes.

[0037] In the flocculation tank system, the return sludge and flocculant are fully mixed with the effluent from the coagulation tank under the action of the agitator in the flocculation tank, so that: the flocs in the influent come into contact and fuse with the return sludge and flocculant, increasing in volume. At the same time, since the return sludge has been concentrated and has a higher concentration, the flocs also become dense. Such large and dense flocs have better sedimentation performance. The return sludge with a higher concentration enters the flocculation tank, making the concentration of the mixed liquid in the flocculation tank much greater than the concentration of suspended solids in the influent. Therefore, even if the water quality and water volume fluctuate to a certain extent, the impact on the overall process is not significant.

[0038] The effluent from the flocculation system enters the sedimentation tank system over a large area. Its velocity slows as it passes through the unstirred settling zone. Under the influence of gravity, the vast majority of suspended solids in the water (primarily previously formed flocs) settle in the sedimentation tank system. Clear water then flows upward through the inclined tubes. Thanks to the shallow sedimentation in the inclined tubes, the small amount of suspended solids carried away by the water flow is also trapped in the inclined tubes, further ensuring that the effluent has an extremely low suspended solids content.

[0039] In the sludge system, heavier suspended solids settle to form sludge, which is concentrated by gravity at the bottom of the tank. The concentrated sludge is returned to the flocculation system through a sludge pump or discharged outside the high-density clarifier.

[0040] Figure 1 The cross section of the high-density sedimentation tank according to the present disclosure is shown, specifically the cross section of a coagulation tank system and / or a flocculation tank system and a sedimentation tank system. The high-density sedimentation tank as a whole can have a rectangular tank body, and the tank body can be made of concrete or metal, for example. Figure 1According to the present disclosure, the high-density sedimentation tank includes a first tank 1, a second tank 2, and a third tank 3, wherein the first tank 1 corresponds to the coagulation tank system and / or flocculation tank system described above, while the second tank 2 and the third tank 3 correspond to the sedimentation tank system described above. The first tank 1 receives the fluid to be treated and performs flocculation treatment on the fluid to be treated. In other examples, the first tank 1 receives the fluid to be treated and performs coagulation treatment on the fluid to be treated. In addition, both coagulation and flocculation treatments can be performed in the first tank 1. Coagulation treatment requires the addition of a coagulant into the first tank 1, and flocculation treatment requires the addition of a flocculant into the first tank 1. For example, the fluid to be treated can be sewage. The second tank 2 is fluidically connected to the first tank 1 to receive the treated fluid from the first tank 1 and perform concentration treatment on the treated fluid. The third tank 3 is fluidically connected to the second tank 2 to receive the treated fluid from the second tank 2 and perform sedimentation treatment on the treated fluid. The first tank 1, the second tank 2, and the third tank 3 can be arranged in a tank body (for example, a metal tank body) and separated from each other by partition walls.

[0041] In addition, the high-density sedimentation tank may further include a transition zone 4. The transition zone 4 is in fluid communication with the first tank 1 and the second tank 2, respectively, and is used to transport the treatment fluid.

[0042] Along Figure 1 In the first direction S1 shown in the figure, the first pool 1, the transition zone 4, the second pool 2, and the third pool 3 are arranged in sequence. The second pool 2 and the third pool 3 are arranged side by side in the first direction S1. For example, the transition zone 4 extends along a second direction S2 that is perpendicular to the first direction S1. For example, the transition zone 4 is located between the first pool 1 and the second pool 2 in the first direction S1. The first direction S1 can be the length direction of the pool body of the high-density sedimentation tank, that is, the horizontal direction. The second direction S2 can be parallel to the height direction of the pool body of the high-density sedimentation tank, that is, the vertical direction in the figure.

[0043] By converting the stacked sedimentation zone and concentration zone into independent second and third tanks connected in series horizontally, the height of the high-density sedimentation tank can be significantly reduced. The height of the high-density sedimentation tank disclosed herein is determined by the maximum height of the second tank 2 and the third tank 3. For example, the height can be changed from 5 to 6 meters or more of a traditional high-density sedimentation tank to 3 to 4 meters, thereby meeting the transportation height restrictions and can also be deployed in a room or basement, thus having high flexibility. In addition, the high-density sedimentation tank disclosed herein still has all the functional elements of a traditional high-density sedimentation tank, such as flocculation, sludge concentration, and inclined tube sedimentation.

[0044] In the sewage treatment process, for example, the influent water, after coagulation in the coagulation tank system, first enters the first tank 1. A flow guide 23 is provided within the first tank 1. Furthermore, the high-density sedimentation tank of the present disclosure may also include a reagent dosing device (not shown) that can inject flocculants into the flow guide 23 to enhance the flocculation effect. Furthermore, as described below, sludge returned from the second tank 2 may also enter the first tank 1, where it is thoroughly mixed with the influent water and reagents, thereby achieving high-density flocculants.

[0045] A stirring device is provided in the guide tube 23 of the first tank 1, which includes a first motor 18 and a stirring paddle for stirring the treated fluid. Specifically, the outer wall of the guide tube 23 can form a cavity with the wall of the first tank 1 to accommodate the fluid.

[0046] The water from the first pool 1 can flow to the second pool 2 through the transition zone 4. Specifically, it rises from the bottom to the top and then climbs over the wall of the transition zone (also called the retaining wall) to enter the second pool 2. Figure 1 , the transition zone 4 includes an inlet end and an outlet end opposite to each other in the second direction S2. A first baffle 5 can be provided at the inlet end, and a first baffle 6 can be provided at the outlet end. For example, in the width direction of the high-density sedimentation tank perpendicular to the paper surface, multiple first baffles 5 can be provided at the inlet end, and multiple first baffles 6 can be provided at the outlet end. For example, multiple first baffles 5 are evenly distributed at the inlet end, and multiple first baffles 6 are evenly distributed at the outlet end. In other examples, the first baffle 5 can also be provided only at the inlet end. For example, the transition zone 4 is formed by the pool wall of the first pool 1 and the pool wall of the second pool 2, the inlet end is provided at the bottom of the first pool 1, and the outlet end is provided at the top of the second pool 2. For example, the first baffle 5 extends obliquely from the pool wall of the first pool 1 toward the pool wall of the second pool 2.

[0047] Because the rotating agitator 18 is installed in the first tank 1, the water flow experiences lateral motion or eddies. If these eddies are not eliminated, these chaotic water flows will negatively impact subsequent sedimentation. By placing several baffles at the inlet and / or outlet of the ascending channel (i.e., transition zone 4) from the first tank 1 to the second tank 2, the water flow can be stabilized. Furthermore, the even distribution of the baffles ensures that the water flow is evenly distributed.

[0048] The effluent from the first tank 1 flows from the outlet of the transition zone 4 to the second tank 2. The second tank 2 comprises a concentration zone 11 (also known as the sludge settling and concentration zone) and a horizontal flow zone 10 (also known as the horizontal flow sedimentation zone) located above the concentration zone 11. The concentration zone 11 is equipped with a sludge scraper 7, which is driven by a second motor 19 to rotate and scrape the sludge. Furthermore, the concentration zone 11 is equipped with a sludge hopper 17, located at the center of the tank bottom. Since there is no inclined pipe module, the total height of the second tank 2, from the bottom sludge hopper to the top, can be a maximum of 3-4 meters.

[0049] The fluid in the advection zone 10 has a lateral flow velocity of less than 0.2 m / s. The height of the advection zone 10 is approximately 0.5 m (e.g., less than 0.5 m), and the ratio of its length to height is approximately 8:1. After flowing out of the first tank 1, the treated fluid flows over the retaining wall and is stabilized and distributed by the first baffle before entering the advection zone 10. As the treated fluid passes through the advection zone 10, suspended particles in the fluid settle due to gravity into the concentration zone 11.

[0050] In other examples, the advection zone 10 of the second pool 2 is provided with a second baffle 20, and the second baffle 20 extends from the top of the second pool 2 along the second direction S2, as shown in FIG. Figure 2 As shown. In other words, the second baffle 20 extends from top to bottom. Through the second baffle 20, the fluid can flow around it, increasing the fluid flow and the fluid's residence time in the second tank 2. Furthermore, the second baffle 20 guides the fluid downward, making it easier for suspended particles in the water to settle. After bypassing the second baffle 20, the fluid then flows upward out of the second tank 2.

[0051] To accommodate different fluids or water qualities, the height of the second baffle 20 (in the second direction S2) and its position in the first direction S1 can be varied. For example, the second baffle 20 can be of different heights. Furthermore, the height and position of the second baffle 20 can be adjusted on-site based on operational conditions.

[0052] For example, the ratio of the hourly volume flow rate passing through the advection zone 10 to the cross-sectional area of ​​the advection zone 10 perpendicular to the second direction S2 varies between 3 and 18, depending on the process fluid.

[0053] Suspended particles in the fluid passing through the advection zone 10 settle downward into the concentration zone 11, forming sludge. This sludge is collected and processed by the sludge scraper 7, such as by gravity compaction and concentration. The sludge scraper 7 scrapes the sludge into the sludge hopper 17. The sludge collected in the sludge hopper 17 is pumped by a sludge pump and discharged through a sludge pipeline to the sludge collection device 24.

[0054] In other examples, the high-density sedimentation tank further includes a sludge return device 15, one end of which is in fluid communication with the second tank 2, and the other end of which is in fluid communication with the first tank 1. Figure 2 For example, one end of the sludge return device is in fluid communication with the hopper 17 of the second tank 2, and the other end is in fluid communication with the guide tube 23 of the first tank 1. A portion of the sludge collected in the hopper 17 is discharged to the sludge treatment system 24 via a sludge pump, while the remaining portion is returned to the first tank 1 via the sludge return device 15, i.e., to the guide tube 23 of the first tank 1. The sludge returned to the first tank 1 can help form high-density heavy alum flocs from suspended particulate matter in the influent of the first tank 1.

[0055] The second tank 2 generally has a square cross section, while the scraper device 7 can only cover a circular area, that is, the scraper blade of the scraper rotates in a circular path. In order to prevent sludge from accumulating at the corners of the second tank 2, the bottom of the second tank is changed from square to round, such as Figure 3 As shown. The bottom of the concentration zone 11 of the second tank 2 has a circular cross-sectional shape. It can be said that the bottom surface 21 of the second tank 2 is circular. Figure 3 The corners of the concentrating zone 11 of the second tank 2 are provided with curved inclined portions 22 extending from the bottom surface 21 toward the wall of the second tank 2. Each of the four corners is provided with a curved inclined portion 22, and the surface of each curved inclined portion 22 forms a portion of a spherical surface. For example, the curved inclined portions 22 can be formed using plain concrete, specifically by filling the four corners with plain concrete. For example, the curved inclined portions 22 can be formed by rolling steel plates, or by splicing steel plates into the desired shape.

[0056] The treated fluid that flows smoothly through the horizontal flow area 10 at the top of the second pool 2 then enters the third pool 3 for fine treatment to further remove suspended particulate matter that has not settled in the second pool 2. The third pool 3 includes a sedimentation area 14, an inlet area 13 located above the sedimentation area 14, and an outlet area 12 located above the inlet area 13. These three areas are not clearly separated and only differ from each other in function. The sedimentation area 14 is provided with a plurality of mud hoppers 8, and the outlet area 12 is provided with an inclined pipe device 9. The total height of the third pool 3 from the bottom mud hopper to the top of the pool can be at most 3~4m. The area of ​​the third pool 3 is the same as that of the second pool 2, wherein the inclined pipe device 9 covers part of the area of ​​the third pool 3. For example, the ratio of the coverage area of ​​the inclined pipe device 9 to the total area of ​​the third pool 3 is 1 / 2~2 / 3. For example, the second pool 2 and the third pool 3 are separated by a common partition wall 16, such as Figure 2 As shown, this makes the high-density sedimentation tank structure more compact. In other examples, instead of the common partition wall 16, the second tank 2 and the third tank 3 can be communicated through a channel or a pipeline.

[0057] The water outlet area 12 at the upper portion is used for finely processing the fluid to further remove suspended particles in the fluid or water, thereby ensuring high quality of the output fluid or water.

[0058] The treated fluid flows over the common partition wall 16 to the water inlet area 13 in the middle. The water inlet area 13 can ensure the stability of the water flow and allow the incoming water to be evenly distributed over the entire projected area of ​​the inclined tube device 9.

[0059] The lower settling zone 14 is used to collect residual suspended particulate matter that settles from the fluid or water. This zone 14 can use a hopper 8 or a bottom scraper to collect sludge. The collected sludge is then discharged by static gravity through a sludge discharge pipe 25 at the bottom of the high-density sedimentation tank 3.

[0060] like Figure 4 The schematic diagram shows a comparison of high-density sedimentation tanks according to different embodiments of the present disclosure, wherein the alignment reference line extends along the common partition wall 16 between the second tank 2 and the third tank 3 of the two high-density sedimentation tanks. Figure 4 It can be seen that in the first direction S1, the second pool 2 and the third pool 3 of the high-density sedimentation tank shown in the upper part are longer than the second pool 2 and the third pool 3 of the high-density sedimentation tank shown in the lower part, that is, they have a longer length. It can be said that at least part of the cross-section perpendicular to the height direction of the second pool 2 and the third pool 3 of the high-density sedimentation tank shown in the upper part has a rectangular shape, that is, a rectangular pool body, while part of the cross-section perpendicular to the height direction of the second pool 2 and the third pool 3 of the high-density sedimentation tank shown in the lower part has a square shape, that is, a square pool body. The cross-section perpendicular to the height direction mentioned here refers to the projected cross-section perpendicular to the height direction of the pool body or the horizontal cross-section of the pool body. This arrangement gives the high-density sedimentation tank a larger volume and area, and the amount of water that can be processed is also increased accordingly, while still having a relatively low height. If installation and transportation conditions permit, the length of the second pool 2 and the third pool 3 can be appropriately lengthened according to the processing volume requirements. Of course, it is also possible for only the second pool 2 to have a rectangular cross-sectional shape or only the third pool 3 to have a rectangular cross-sectional shape.

[0061] Similar to Figure 3 ,exist Figure 4 In the high-density sedimentation tank shown above, the bottom surface 21 of the second tank 2 is circular, that is, the bottom of the concentration zone 11 of the second tank 2 has a circular cross-sectional shape, and the corners of the concentration zone 11 of the second tank 2 are provided with arc-shaped inclined portions 22 extending from the bottom surface 21 of the second tank 2 toward the tank wall of the second tank 2. The arc-shaped inclined portions 22 are provided at all four corners. Figure 3 As shown, the arc-shaped inclined portion 22 can be formed by plain concrete, specifically by filling the four corners with plain concrete. It can also be formed by rolling steel plates or by splicing steel plates in sections. In the case where the second tank 2 is a rectangular tank or a cube tank, the bottom surface 21 of the second tank 2 can be set in the center of the second tank 2, and the scraper device 7 is set on the bottom surface 21 of the second tank 2 and the extension axis of its pivot axis extends through the center of the bottom surface 21. By providing slopes (i.e., arc-shaped inclined portions) on all four sides of the concentration area 11, the sludge settles and slides along the slope to the coverage area of ​​the scraper device, and is then scraped off. The scraper device can be additionally provided with concentrating bars, so that the sludge is concentrated while being scraped off, thereby greatly increasing the discharge concentration and reducing the discharge volume.

[0062] like Figure 5As shown in a highly schematic manner, a lateral flow inclined plate assembly 30 can be provided at the horizontal flow area 10 of the second tank 2 of the high-density sedimentation tank, which can further improve the processing capacity of the high-density sedimentation tank, especially when the extension of the second tank is limited due to the transportation size and the angle of the inclined portion of the concentration zone. An embodiment without the lateral flow inclined plate assembly is also possible. For example, the lateral flow inclined plate assembly 30 is a straight-through type, which can adopt a variety of plate shapes such as a straight plate, a straight plate with a wing plate, a corrugated plate, etc. Figure 6 As shown, the lateral flow inclined plate assembly 30 includes a plurality of lateral flow inclined plates 31 arranged in parallel with each other. A flow channel for sewage is formed between two adjacent lateral flow inclined plates 31. The lateral flow inclined plate assembly 30 is configured so that the lateral flow inclined plates 31 extend obliquely relative to the second direction S2 toward the concentration area 11 of the second tank 2. The straight-through type mentioned above means that the lateral flow inclined plates 31 extend without bending. Sewage can flow horizontally through each lateral flow inclined plate 31, as shown in FIG. Figure 6 As shown by the small and medium arrows, particulate matter in the sewage is more likely to settle to the bottom of the tank when flowing through the side flow inclined plate. Therefore, under the condition of the same tank volume or area, the treatment capacity of the high-density sedimentation tank can be improved after the side flow inclined plate assembly is installed. In addition, the side flow inclined plate assembly makes the flow of sewage more stable, reduces short-flow, and improves treatment efficiency. In addition, due to the use of straight-through side flow inclined plate assemblies, compressed air can be used to clean (i.e., air wash) the side flow inclined plate assembly from below, and water can be used to flush (i.e., water wash) the side flow inclined plate assembly from above, making cleaning and maintenance more convenient and more efficient.

[0063] See again Figure 4 and 5 In the horizontal flow area 10 of the second pool 2, a water inlet rectifying device 32 and / or a water outlet rectifying device 33 may be provided. Figure 4 As shown, the water inlet straightening device 32 can be set near the water inlet position of the horizontal flow area 10, and the water outlet straightening device 33 can be located near the water outlet position of the horizontal flow area 10. In other words, the fluid entering the second pool 2 first passes through the water inlet straightening device 32 before entering, and the fluid flowing out of the second pool 2 passes through the water outlet straightening device 33 before flowing out. Figure 5 As shown, the inlet straightening device 32 can be installed near the water inlet end of the lateral flow inclined plate assembly 30, and the outlet straightening device 33 can be installed near the water outlet end of the lateral flow inclined plate assembly 30. The straightening devices can eliminate a certain amount of energy in the fluid, allowing the fluid to enter the subsequent parts more evenly, such as the perforated plate or grid that serves to distribute water evenly.

[0064] As mentioned above, the height of the high-density sedimentation tank disclosed in the present invention can be significantly reduced, so it can be flexibly deployed in various application environments, and transportation is also more flexible. In addition, the high-density sedimentation tank disclosed in the present invention can achieve reasonable guidance and distribution of the fluid by reasonably setting the baffles, eliminate the vortex and turbulence of the fluid after flocculation, and lay a good foundation for the subsequent efficient treatment of concentration and inclined tube sedimentation. Furthermore, the structure of the high-density sedimentation tank disclosed in the present invention is regular, simple, and easy to process and manufacture, with a compact layout and a small footprint, which is convenient for installing additional devices such as sludge return pumps, chemical dosing devices, electrical control devices, etc., and can be delivered as a whole. Furthermore, the high-density sedimentation tank disclosed in the present invention can adjust the processing volume by adjusting the length of the tank body, and can increase the processing volume by additionally setting a lateral flow inclined plate assembly, so it is highly flexible.

[0065] In addition, the technical features disclosed above are not limited to the disclosed combinations with other features. Those skilled in the art may also make other combinations between the technical features according to the purpose of disclosure to achieve the purpose of this disclosure.

Claims

1. A high-density sedimentation tank, characterized in that: The high-density sedimentation tank comprises: A first tank (1) receives the fluid to be treated and performs coagulation and / or flocculation treatment on the fluid to be treated; a second tank (2) in fluid communication with the first tank to receive the treated fluid from the first tank and perform a concentration treatment on the treated fluid; a third tank (3) in fluid communication with the second tank to receive the treatment fluid from the second tank and perform precipitation treatment on the treatment fluid; and a transition zone (4), in fluid communication with the first tank and the second tank respectively and used for conveying treatment fluid, wherein the second pool (2) and the third pool (3) are arranged side by side in a first direction (S1), and The transition zone (4) extends along a second direction (S2) perpendicular to the first direction and is located between the first pool (1) and the second pool (2) in the first direction (S1).

2. The high-density sedimentation tank according to claim 1, characterized in that The transition zone (4) comprises an inlet end and an outlet end which are opposite to each other in a second direction (S2), and a first baffle (5, 6) is provided at the inlet end and / or the outlet end.

3. The high-density sedimentation tank according to claim 2, characterized in that: The transition zone (4) is formed by the pool wall of the first pool (1) and the pool wall of the second pool (2), the inlet end is arranged at the bottom of the first pool (1), and the outlet end is arranged at the top of the second pool (2).

4. The high-density sedimentation tank according to claim 1, characterized in that The second pool (2) and the third pool (3) are separated by a common partition wall (16).

5. The high-density sedimentation tank according to claim 1, characterized in that: At least a portion of the second tank (2) and / or the third tank (3) has a square or rectangular shape in a cross section perpendicular to the height direction thereof.

6. The high-density sedimentation tank according to any one of claims 1 to 4, characterized in that: The second pool (2) comprises a concentration zone (11) and a flat flow zone (10) located above the concentration zone, wherein the concentration zone (11) is provided with a sludge scraping device (7).

7. The high-density sedimentation tank according to claim 6, characterized in that: A second baffle (20) is provided in the advection zone of the second pool (2), and the second baffle extends from the top of the second pool (2) along a second direction (S2).

8. The high-density sedimentation tank according to claim 6, characterized in that: The bottom of the concentration zone (11) of the second tank (2) has a circular cross-sectional shape.

9. The high-density sedimentation tank according to claim 8, characterized in that: An arc-shaped inclined portion (22) extending from the bottom surface (21) of the second tank (2) toward the tank wall of the second tank is provided at a corner of the concentration zone (11) of the second tank (2).

10. The high-density sedimentation tank according to claim 9, characterized in that: The bottom surface (21) is located in the center of the second pool (2), and the scraping device (7) is arranged on the bottom surface (21).

11. The high-density sedimentation tank according to claim 6, characterized in that: The horizontal flow area (10) of the second pool (2) can be provided with a lateral flow inclined plate assembly (30), wherein the lateral flow inclined plate assembly comprises a plurality of lateral flow inclined plates (31) arranged parallel to each other.

12. The high-density sedimentation tank according to claim 11, characterized in that: The lateral flow inclined plate assembly (30) is a straight-through type lateral flow inclined plate assembly.

13. The high-density sedimentation tank according to claim 6, characterized in that: The advection zone (10) of the second pool (2) can be provided with an inlet straightening device (32) and / or an outlet straightening device (33).

14. The high-density sedimentation tank according to any one of claims 1 to 4, characterized in that: The third pool (3) comprises a sedimentation area (14), a water inlet area (13) located above the sedimentation area (14), and a water outlet area (12) located above the water inlet area (13), wherein the sedimentation area (14) is provided with a plurality of mud hoppers (8), and the water outlet area (12) is provided with an inclined pipe device (9).

15. The high-density sedimentation tank according to any one of claims 1 to 4, characterized in that: The high-density sedimentation tank further comprises a sludge return device (15), one end of which is in fluid communication with the second tank (2), and the other end of which is in fluid communication with the first tank (1).

Images