A sedimentation tank equipped with a blocking device

Abstract

A novel sedimentation tank equipped with an obstruction device comprises a tank body and a settling area within the tank body. A lateral flow sedimentation and separation device is disposed within the settling area. The obstruction device is a grating plate. Vertically, the grating plate is positioned below the lateral flow sedimentation and separation device with its main plane horizontal. Horizontally, the edges of the grating plate are fixed to the upstream tank wall and two side walls, and the other edges of the grating plate extend at least to the bottom of the water inlet end of the lateral flow sedimentation and separation device. The obstruction device is designed to force sludge to pass through the grating plate from top to bottom, thereby obstructing water flow from around the bottom of the lateral flow sedimentation and separation device. This device has the advantages of preventing water cross-flow and short-circuiting, and achieving high water treatment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment sedimentation, in particular to a novel sedimentation tank equipped with an obstruction device. Background Art

[0002] In the water treatment field, existing high-efficiency sedimentation and separation tanks are integrated water treatment structures that combine mixing, flocculation, and inclined tube sedimentation, and are equipped with external sludge return and external dosing to form a complete water purification system. Existing sedimentation and separation tanks primarily utilize sludge return and PAM to enhance flocculation, while also installing inclined tubes in the sedimentation area.

[0003] A typical prior art solution is an improved high-efficiency sedimentation tank integrated with a sand filter tank, as disclosed in announcement number CN207645963. The integrated solution includes a reaction tank, a transition tank, and a sedimentation filter tank. The reaction tank is connected to the transition tank, which is in turn connected to the sedimentation filter tank. The reaction tank is used to provide a reaction space. The transition tank is used to provide sewage transition. The sedimentation filter tank is used to provide sedimentation filtration. The reaction tank uses physical stirring and air lift to process sewage of different flow rates. The transition tank uses hydraulic design and air lift to facilitate sewage transition and avoid sedimentation in the transition tank. The sedimentation filter tank uses sedimentation and filtration to ensure effluent water quality. The integrated design has the characteristics of wide applicability, high treatment efficiency, stable effluent water quality, small footprint, and low cost.

[0004] The sedimentation tank disclosed in CN207645963 uses an inclined tube sedimentation separation method, that is, a counter-flow sedimentation separation device. In a counter-flow sedimentation separation device, the water path is upward and the sludge path is downward, which has the disadvantage of mutual interference. In contrast, a lateral flow separation device can achieve horizontal water flow and vertical sludge drop, providing optimal sedimentation and separation efficiency.

[0005] However, when using the lateral flow sedimentation separation device, the experiment found that there was a phenomenon of water cross-flow and short-circuiting. Figure 1 , Figure 1 This is a schematic elevation view of a sedimentation zone with a lateral flow sedimentation separation device installed. In terms of water flow direction, the sedimentation zone consists of an upstream wall 34, a downstream wall 35, two side walls, and a bottom. The lateral flow sedimentation separation device 33 is installed in the sedimentation zone, and a scraper 6 is provided at the bottom of the sedimentation zone. The ideal water sedimentation separation process is as follows: Figure 1 As shown by the hollow arrow in the figure, water flows from the water distribution wall 23 on the upstream wall 34 into the sedimentation area and then into the inlet of the lateral flow sedimentation separation device 33. In the lateral flow sedimentation separation device 33, the sludge slides vertically downward to the bottom and is discharged by the scraper 6. The water after the sludge separation flows horizontally toward the downstream wall 35 and flows out through the outlet pipe 52 on the downstream wall 35. However, as Figure 1 As indicated by the solid arrow in the middle, a significant portion of water inevitably fails to pass through the lateral flow settling and separation device 33. This portion of water bypasses the bottom of the lateral flow settling and separation device 33 and flows toward the downstream wall 35 without undergoing settling and separation, thereby degrading the water quality flowing out of the outlet pipe 52. Furthermore, the sludge scraper 6, typically located below the lateral flow settling and separation device 33, also causes sludge to rise during operation, causing previously settled sludge to rise again and enter the water inlet of the lateral flow settling and separation device 33, thus affecting the effectiveness of the settling and separation process. Summary of the Invention

[0006] In order to solve the problems of water cross-flow and short-circuiting and the problem of sludge rising affecting sedimentation and separation in the above-mentioned prior art, the main purpose of the present invention is to provide a new sedimentation tank equipped with an obstruction device.

[0007] To achieve the above-mentioned purpose, the present invention provides a new type of sedimentation tank equipped with an obstruction device, which includes a tank body and a sedimentation area located in the tank body, the sedimentation area having an upstream tank wall and a side wall adjacent to the upstream tank wall, a lateral flow sedimentation separation device is arranged in the sedimentation area, and the lateral flow sedimentation separation device has a water inlet end; an obstruction device, the obstruction device is a grating plate, in the vertical direction, the grating plate is arranged below the lateral flow sedimentation separation device with the main plane horizontal, in the horizontal plane, the edge of the grating plate is fixed on the upstream tank wall of the sedimentation area and the two side walls adjacent to the upstream tank wall, and the other edge of the grating plate extends to at least the bottom of the water inlet end of the lateral flow sedimentation separation device; the obstruction device is used to allow sludge to pass through the grating plate from top to bottom, and become an obstacle for water flow to bypass the bottom of the lateral flow sedimentation separation device.

[0008] See the above scheme Figure 2 , Figure 2 It is a sedimentation area equipped with an obstruction device 7. Since the obstruction device is arranged in the sedimentation area, water can only enter the water inlet end of the lateral flow sedimentation separation device 33 after entering from the upstream pool wall 34, and flow to the downstream pool wall 35 after sedimentation and separation, but cannot flow through the bottom of the lateral flow sedimentation separation device without hindrance. At the same time, since the obstruction device adopts a grid plate type, on the one hand, the sludge can pass through the grid into the bottom of the pool under the action of gravity, thereby improving the efficiency of water treatment, and on the other hand, it is also convenient for processing and construction and installation.

[0009] A further solution is that the grating plate includes multiple first angled members and multiple second angled members arranged alternately up and down, the multiple first angled members and the multiple second angled members all have corners at the top and wing plates at the bottom, the outer surfaces of the wing plates constitute slippery surfaces, and slit-type slippery holes are formed between the bottom edges of the two wing plates of the first angled members and the outer surfaces of the adjacent wing plates of the second angled members.

[0010] A further solution is that the gap of the slit-type mud sliding hole gradually decreases from the upstream pool wall to the downstream pool wall. The advantage of this solution is that the size of the sludge sliding channel can be more accurately controlled, thereby improving water treatment efficiency.

[0011] Another further solution is that the grating plate includes a plurality of first angled members and a plurality of second angled members arranged in an upper and lower staggered manner, wherein the corners of the plurality of first angled members and the plurality of second angled members are at the top and the wing plates are at the bottom, and the outer surfaces of the wing plates constitute mud sliding surfaces, and the bottom edges of the two wing plates of the first angled member are provided with a plurality of spaced notches along the length direction, and after the bottom edges are fixed to the outer surfaces of the adjacent wing plates of the second angled member, the plurality of notches form spaced mud sliding holes.

[0012] A further solution is that the area of the spaced mud sliding holes gradually decreases from the upstream pool wall to the downstream pool wall. The advantage of this solution is that the size of the sludge sliding channel can be more accurately controlled, thereby improving water treatment efficiency.

[0013] A further solution is to provide a scraper at the bottom of the sedimentation zone; the other edge of the grid plate extends to the downstream pool wall of the sedimentation zone. Figure 3 Since the obstruction device 7 is provided in the entire sedimentation area, not only the water flow cross-flow and short-circuiting is better prevented, but also a barrier is provided between the scraper 6 at the bottom and the upper water flow channel. The obstruction device 7 can make the sludge sinking in the lateral flow sedimentation separation device and the entire upper water flow slide down the upper surface of the first angled member and the second angled member wing plate through the mud sliding hole to the bottom of the pool, and the floating sludge lifted by the scraper will be suppressed by the lower surface of the first angled member and the second angled member wing plate, thereby further improving the efficiency of water treatment.

[0014] A further solution is that the lateral flow sedimentation separation device includes a primary sedimentation separation device and a secondary sedimentation separation device, and the water flows sequentially through the primary sedimentation separation device and the secondary sedimentation separation device, the primary sedimentation separation device adopts an inclined plate sedimentation separation device, and the secondary sedimentation separation device adopts a horizontal tube sedimentation separation device; or the primary sedimentation separation device and the secondary sedimentation separation device both adopt horizontal tube sedimentation separation devices, but the sludge flux of the primary sedimentation separation device is greater than the sludge flux of the secondary sedimentation separation device.

[0015] A further solution is to also include a flushing device, which has a power facility, a running track, a flushing water pump and a spray pipe. The running track is erected in the water collection area. The spray pipe includes a horizontal spray pipe and a vertical spray pipe. The horizontal spray pipe is located above the lateral flow sedimentation separation device, and the vertical spray pipe is located at the water outlet. The flushing device is also provided with a disinfectant bypass pipe.

[0016] A further solution is that a second support beam and a third support beam supporting the lateral flow sedimentation separation device are provided in the sedimentation area; the grating plate is close to the lower ends of the second support beam and the third support beam, or is arranged in sections and intervals between the upstream pool wall and the second support beam, between the second support beam and the third support beam, and between the third support beam and the downstream pool wall.

[0017] Another further solution is to further include a flocculation zone located upstream of the sedimentation zone, a mixing zone located upstream of the flocculation zone, and a sludge return pipe is provided between the sedimentation zone and the flocculation zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the elevation structure of the sedimentation area of the existing lateral flow sedimentation separation device;

[0019] Figure 2 This is a schematic diagram of the elevation structure of the sedimentation area after the obstruction device 7 is installed in the present invention;

[0020] Figure 3 It is a schematic diagram of the elevation structure of the sedimentation area after the obstruction device 7 is installed in the entire sedimentation area;

[0021] Figure 4 is a structural elevation diagram of a first embodiment of the present invention;

[0022] Figure 5 yes Figure 4 Upper floor plan;

[0023] Figure 6 yes Figure 4 Schematic diagram of the middle layer plane, in which the mixing zone 1 and flocculation zone 2 are omitted;

[0024] Figure 7 yes Figure 6 A three-dimensional schematic diagram showing the arrangement of the obstruction device 7 in the sedimentation area;

[0025] Figure 8 yes Figure 4 Ground floor plan;

[0026] Figure 9 is a structural elevation diagram of a second embodiment of the present invention;

[0027] Figure 10 yes Figure 9 Upper floor plan;

[0028] Figure 11 yes Figure 9 The mid-level floor plan;

[0029] Figure 12 yes Figure 11A three-dimensional schematic diagram showing the arrangement of the obstruction device 7 in the sedimentation area;

[0030] Figure 13 is a structural diagram of an embodiment of the blocking device 7;

[0031] Figure 14 yes Figure 13 A perspective view of a first angled member 71 and a second angled member 72 in a combined state;

[0032] Figure 15 It is a structural diagram of another embodiment of the blocking device 7.

[0033] Wherein: mixing zone 1, water inlet pipe 11, mixing mixer 12; flocculation zone 2, flocculation mixer 21, water hole 22, water distribution wall 23; sedimentation zone 3, natural sedimentation zone 31, separation sedimentation zone 32, first support beam 311, water distribution device 312, second support beam 321, middle support beam 322, third support beam 323, lateral flow sedimentation separation device 33, first sedimentation separation device 331, second sedimentation separation device 332, upstream pool wall 34, downstream pool wall 35, side wall 36, side wall 37; water collection area 4, fourth support beam 41, water collection device 42; water outlet area 5, water outlet device 51, water outlet pipe 52; sludge scraper 6, sludge discharge pipe 61, sludge return pipe 62; obstruction device 7, first angle member 71, mud sliding hole 711, second angle member 72; flushing device 8, horizontal spray pipe 81, vertical spray pipe 82, vertical spray pipe 83.

[0034] The present invention is described in detail below with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0035] First embodiment

[0036] See also Figure 4 , Figure 4This is a vertical view of a new type of sedimentation tank equipped with an obstruction device according to the present invention. The tank body of the sedimentation tank is provided with an inlet pipe 11 and an outlet pipe 52, and a mixing zone 1, a flocculation zone 2, a sedimentation zone 3, a water collection zone 4 and a water outlet zone 5 are arranged between the inlet pipe 11 and the outlet pipe 52 in the order of the water flow direction. The mixing zone 1 is provided with a mixing mixer 12, the flocculation zone 2 is provided with a flocculation mixer 21, and the separation and sedimentation zone 32 is provided with a lateral flow sedimentation separation device 3 consisting of a primary sedimentation separation device 331 and a secondary sedimentation separation device 332. The water flows sequentially from the primary sedimentation separation device 331 to the secondary sedimentation separation device 332. In the direction of water flow, the sedimentation zone 3 has an upstream pool wall 34 and a downstream pool wall 35, as well as a side wall 36 and a side wall 37 adjacent to and connected to the upstream pool wall 34. The water in the flocculation zone 2 enters the sedimentation zone 3 after passing through the water hole 22 and the water distribution wall 23 provided on the upstream pool wall 34. The sedimentation zone 3 is divided into a natural sedimentation zone 31, a water distribution zone consisting of a water distribution device 312, and a separation and sedimentation zone 3 according to the direction of water flow. 2. The water collection area 4 and the water outlet area 5. The sedimentation area 3 is provided with a first support beam 311, a second support beam 321, an intermediate support beam 322, a third support beam 323 and a fourth support beam 41 fixed between the side wall 36 and the side wall 37. The first support beam 311 supports the water distribution device 312. The second support beam 321 and the intermediate support beam 322 support the first sedimentation and separation device 331. The intermediate support beam 322 and the third support beam 323 support the second sedimentation and separation device 332. The fourth support beam 41 supports the water collection device 42. The water outlet area 5 is provided with a water outlet weir and other water outlet devices 51. A scraper 6 is provided at the bottom between the upstream pool wall 34 and the downstream pool wall 35. A sludge discharge pipe 61 and a sludge return pipe 62 are also provided. A flushing device 8 is provided at the top of the water collection area 4. The flushing device 8 includes a running track spanning between the side walls 36 and 37, a power facility, a flushing water pump, and a horizontal spray pipe 81, a vertical spray pipe 82, and a vertical spray pipe 83. A disinfectant container is also provided next to the sedimentation tank and is connected to the flushing device 8 through a disinfectant bypass pipe. The above structures are the same as those in the prior art, and those skilled in the art can implement them according to the prior art. The configured obstruction device 7 is a grating plate structure, which is tightly attached to the bottom surface of each support beam and covers the entire sedimentation area 3, dividing the sedimentation area 3 into an upper and lower part, separating the scraper at the bottom from the upper part, and the four sides of the entire grating plate are fixed on the upstream pool wall 34, the side wall 36, the side wall 37, and the downstream pool wall 35, and the middle is fixed on the lower end of each support beam.Obviously, if the grating is manufactured in longitudinal segments, divided into several sections and appropriately elevated and fixed, as long as it is closely adjacent to the water inlet of the lateral flow sedimentation separation device 33, one section is fixed between the upstream pool wall 34 and the first support beam 311, one section is fixed between the first support beam 311 and the second support beam 321, one section is fixed between the second support beam 321 and the middle support beam 322, one section is fixed between the middle support beam 322 and the third support beam 323, one section is fixed between the third support beam 323 and the fourth support beam 41, and the last section is fixed between the fourth support beam 41 and the downstream pool wall 35, the same technical effect of mud-water separation can be achieved. In addition, in this example, the primary sedimentation separation device 331 adopts an inclined plate sedimentation separation device, and the secondary sedimentation separation device 332 adopts a horizontal tube sedimentation separation device. In other embodiments, both can adopt horizontal tube sedimentation separation devices, but the sludge flux of the primary sedimentation separation device 331 should be greater than that of the secondary sedimentation separation device 332, so that the sludge sedimentation and separation is more precise.

[0037] See also Figure 5 , Figure 5 This is a top plan view of a novel sedimentation tank equipped with an obstruction device. It should be noted that a very small amount of sludge will still settle in the water entering the water collection area 4 and the water outlet area 5. The sedimentation area 3 of the present invention is enclosed by the upstream tank wall 34, side walls 36, side walls 37, and downstream tank wall 35. Therefore, the water collection area 4 and the water outlet area 5 are located above the obstruction device 7 and do not extend downward to the bottom. A sludge return pipe 62 is used to return some of the sludge at the bottom of the sedimentation area 3 to the flocculation zone 2.

[0038] See also Figure 6 and Figure 7 , Figure 6 It is a mid-level plan that omits other irrelevant structures. Figure 7 yes Figure 6 The three-dimensional schematic diagram is mainly used to show the arrangement of the obstruction device 7. The grid plate type obstruction device 7 is arranged below the lateral flow sedimentation separation device 3, and its four sides are respectively fixed on the upstream pool wall 34, side wall 36, side wall 37 and downstream pool wall 35. The middle area that is in close contact with the bottom of the support beam is fixed to the bottom of each support beam.

[0039] See also Figure 8 , Figure 8 It is a bottom floor plan of this embodiment, which mainly shows the scraper 6 located between the upstream pool wall 34, side wall 36, side wall 37 and downstream pool wall 35. Since there is an obstruction device 7 above the scraper 6 to separate it from the upper space, the upward sludge generated by the scraper 6 when it is working will be blocked by the grille plate serving as the obstruction device 7, thereby improving the sedimentation efficiency.

[0040] Second embodiment

[0041] See also Figure 9 and Figure 10 The sedimentation tank in this example has a circumferential sedimentation area. The water entering from the water distribution wall 23 passes through the annular natural sedimentation area 31 and then enters the annular separation sedimentation area 32. A plurality of lateral flow sedimentation separation devices 33 are radially arranged in the separation sedimentation area 32, that is, the water inlet of each lateral flow sedimentation separation device faces the natural sedimentation area 31, and the water outlet side faces the annular water collection area 4. The annular water collection device 42 contains the water outlet area 5 and the water outlet pipe 52.

[0042] See also Figure 9 Multiple lateral flow sedimentation and separation devices 33 are located and fixed on the annular second support beam 321 and the annular third support beam 323. The flushing device 8 is rotatably fixed in the middle of the tank body and located above the lateral flow sedimentation and separation devices 33. The spray pipeline includes a horizontal spray pipe 81 and a vertical spray pipe 82.

[0043] See also Figure 11 and Figure 12 In this example, upstream pool wall 34, side walls 36, and side walls 37 form a circumferential wall. Due to its special structural form, the downstream pool wall no longer exists, but the design concept of the present invention still holds true. The obstruction device 7 is fixed to the circumferential wall, with the downstream end fixed to the center of the pool and the middle portion fixed to the lower ends of the annular second support beam 321 and third support beam 323. This can also effectively separate mud and water in the sedimentation area, prevent water from flowing through the sedimentation area, and isolate the scraper 6 from the upper layer.

[0044] Implementation of the grid plate

[0045] The first embodiment of the grid plate is shown in FIG. Figure 13 and Figure 14 A key feature of the present invention is that the grating plate, which serves as the obstruction device 7, comprises an upper row of multiple first angled members 71 and a lower row of multiple second angled members 72. The two rows are staggered, forming a "mountain" shape with each of the adjacent second angled members. Each of the first angled members 71 and the adjacent second angled members have their corners facing upward and their wings facing downward. The bottom edges of the wings of the first angled members are provided with multiple spaced notches along their lengths. These notches, when secured to the outer surfaces of the wings of the adjacent second angled members, form spaced mud-sliding holes 711. As a result, when water flows from above parallel to the plane of the grating plate, only sludge particles that sink due to gravity slide on the outer surfaces of the inclined wings and fall through the mud-sliding holes, passing through the grating plate and into the area below where the scraper is located. Consequently, the outer surfaces of the wings become mud-sliding surfaces, while the inner surfaces of the wings face downward, preventing sludge lifted up by the scraper from passing upward through the grating plate. This embodiment has the advantage of high structural strength and resistance to deformation, making it suitable for manufacture and installation.

[0046] Another embodiment of the grid plate is shown in Figure 15 The difference between this example and the previous example is that there is no longer a notch on the bottom edge of the wing plate of the first angled member 71. Instead, a rigid frame is set up around the grid plate, and the two ends of the first angled member 71 and the second angled member 72 are fixed to the frame, and a gap is left between the bottom edge of the first angled member 71 and the wing plate of the second angled member 72, thereby forming a continuous slit-type mud slide hole 711 in this example, which is different from the previous example.

[0047] Obviously, the closer the area is to the upstream pool wall 34, the larger the particle size of the sludge is. When it reaches the water collection area 4 and the water outlet area 5, there is very little sludge in the water and the particle size is also very small. Therefore, the area of the mud holes in the above embodiments can be set to the minimum, that is, from the upstream pool wall to the downstream pool wall, the number of spaced mud holes can be gradually reduced, or the size can be gradually reduced, and the slit mud holes can be set to gradually reduce the gap.

[0048] The main inventive concept of the present invention is to add an obstruction device 7, which adopts a grid plate structure and is fixed upstream of the water inlet of the lateral flow sedimentation separation device 33 or covers the entire sedimentation area in a way that the main plane is parallel to the water flow direction. First, it prevents the water flow from bypassing the bottom of the lateral flow sedimentation separation device 33; second, it allows the sludge to pass vertically; third, it prevents the rising sludge caused by the scraper 6 from returning to the upper part of the sedimentation area 3. Therefore, the grid plate based on this design purpose can also have more structural implementation methods, such as stamped corrugated board, and punching dense mud sliding holes 711 on the board surface of the corrugated board, or using multi-layer mesh boards, all of which can achieve the above design purposes.

Claims

1. A sedimentation tank equipped with an obstruction device, comprising a tank body and a sedimentation zone located within the tank body, the sedimentation zone having an upstream tank wall and a side wall adjacent to the upstream tank wall, a lateral flow sedimentation and separation device disposed within the sedimentation zone, the lateral flow sedimentation and separation device having a water inlet end; Its characteristics are: An obstruction device, wherein the obstruction device is a grating plate, which is vertically arranged below the lateral flow sedimentation separation device with its main plane horizontal, wherein an edge of the grating plate is fixed to an upstream pool wall of the sedimentation zone and two side walls adjacent to the upstream pool wall in a horizontal plane, and another edge of the grating plate extends at least to the bottom of the water inlet end of the lateral flow sedimentation separation device; The obstruction device is used to allow the sludge to pass through the grid plate from top to bottom and become an obstacle for the water flow to bypass the bottom of the lateral flow sedimentation separation device; The grid plate includes a plurality of first angled members and a plurality of second angled members arranged in an up-down staggered manner. The plurality of first angled members and the plurality of second angled members have their corners on the top and wing plates on the bottom. The outer surfaces of the wing plates constitute mud-slip surfaces.

2. A sedimentation tank equipped with an obstruction device according to claim 1, characterized in that: Slit-type mud sliding holes are formed between the bottom edges of the two wing plates of the first angled member and the outer surfaces of the adjacent wing plates of the second angled member.

3. A sedimentation tank equipped with an obstruction device according to claim 2, characterized in that: The gap of the slit-type mud sliding hole gradually decreases from the upstream pool wall toward the downstream pool wall.

4. The sedimentation tank equipped with an obstruction device according to claim 1, characterized in that: The bottom edges of the two wing plates of the first angled member are provided with a plurality of spaced notches along the length direction. After the bottom edges are fixed to the outer surfaces of the adjacent wing plates of the second angled member, the plurality of notches form spaced mud sliding holes.

5. A sedimentation tank equipped with an obstruction device according to claim 4, characterized in that: The area of the interval-type mud sliding holes gradually decreases from the upstream pool wall toward the downstream pool wall.

6. A sedimentation tank equipped with an obstruction device according to any one of claims 1 to 5, characterized in that: A mud scraper is provided at the bottom of the sedimentation zone; The other edge of the grid plate extends to the downstream pool wall of the sedimentation zone.

7. A sedimentation tank equipped with an obstruction device according to claim 6, characterized in that: The lateral flow sedimentation separation device includes a primary sedimentation separation device and a secondary sedimentation separation device, and water flows sequentially through the primary sedimentation separation device and the secondary sedimentation separation device. The primary sedimentation separation device adopts an inclined plate sedimentation separation device, and the secondary sedimentation separation device adopts a horizontal tube sedimentation separation device. Or the primary sedimentation separation device and the secondary sedimentation separation device both adopt horizontal tube sedimentation separation devices, but the sludge flux of the primary sedimentation separation device is greater than the sludge flux of the secondary sedimentation separation device.

8. The sedimentation tank equipped with an obstruction device according to claim 6, characterized in that: The sedimentation area is provided with a second support beam and a third support beam supporting the lateral flow sedimentation separation device; The grating plate is close to the lower ends of the second support beam and the third support beam, or is arranged in sections and intervals between the upstream pool wall and the second support beam, between the second support beam and the third support beam, and between the third support beam and the downstream pool wall.

9. The sedimentation tank equipped with an obstruction device according to claim 6, characterized in that: The method further comprises a flocculation zone located upstream of the sedimentation zone and a mixing zone located upstream of the flocculation zone. A sludge return pipe is provided between the sedimentation zone and the flocculation zone.

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