A vertical flow sedimentation tank and sewage treatment system

Abstract

The present invention discloses a vertical flow sedimentation tank and sewage treatment system, comprising a sludge discharge system disposed at the bottom of the sedimentation tank and a water inlet system disposed at the center of the top of the sedimentation tank. The system comprises: a sludge hopper disposed at the bottom of the sedimentation tank, the bottom end of the sludge hopper being connected to a sludge discharge pipe; a water inlet system disposed at the top of the sedimentation tank and extending into the interior of the sedimentation tank, for allowing sewage to enter the sedimentation tank and / or adding chemicals to the sewage; and a diversion device disposed directly below the outlet of the water inlet system for draining sludge. The vertical flow sedimentation tank of the present invention improves sludge discharge efficiency by disposing a diversion device at the bottom of the sludge hopper. The sludge at the bottom of the tank can be fully discharged, reducing the water carried over by mixed discharge, improving sludge discharge efficiency, and reducing the water content of the discharged sludge.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a vertical flow sedimentation tank and a sewage treatment system. Background Art

[0002] A sedimentation tank is a device that uses sedimentation to remove suspended matter from water and purify the water. The working principle is to use the natural sedimentation of water or the effect of coagulation and sedimentation to remove suspended matter in the water. The sedimentation effect is determined by the flow rate of water in the sedimentation tank and the residence time of water in the tank. Sedimentation tanks have a wide range of market demand and applications in the field of water treatment, and sedimentation tank technology is used in almost all water treatment projects. The bottom of a vertical flow sedimentation tank is a funnel-shaped cone. In existing practical applications, sludge settles, concentrates, and accumulates at the bottom of the tank. The sludge discharge method commonly used in vertical flow sedimentation tanks is to set a sludge discharge pipe at the bottom or top of the tank, and connect a sludge discharge valve to the external connection of the sludge discharge pipe to control the sludge discharge. However, in actual operation, it is often the case that when discharging sludge, the sludge in the center of the sludge sedimentation area at the bottom of the pool will quickly collapse, forming a funnel-shaped cavity. As the flow rate increases, the surrounding sludge has not yet been discharged, and the upper layer of clean water has already flowed straight into the sludge outlet with the sludge outlet as the center. As the mud and water mixed flow quickly forms, water becomes the main discharge body, while a large amount of surrounding sludge is still attached to the slope of the bottom of the pool, making it difficult to discharge. Summary of the Invention

[0003] (1) Purpose of the invention

[0004] The purpose of the present invention is to provide a vertical flow sedimentation tank and a sewage treatment system to solve the technical problem in the prior art that a large amount of sludge remains on the slope of the mud hopper.

[0005] (2) Technical solution

[0006] To solve the above problems, the first aspect of the present invention provides a vertical flow sedimentation tank, including a sludge discharge system arranged at the bottom of the sedimentation tank and a water inlet system arranged at the center of the top of the sedimentation tank, which includes: a sludge hopper, which is arranged at the bottom of the sedimentation tank, and the bottom end of the sludge hopper is connected to the sludge discharge pipe; a water inlet system, which is arranged at the top of the sedimentation tank and extends to the interior of the sedimentation tank, for allowing sewage to enter the sedimentation tank and / or adding medicine to the sewage; a diversion device, which is arranged directly below the outlet of the water inlet system, for draining sludge.

[0007] Furthermore, the flow guiding device is a double cone.

[0008] Furthermore, the bottom surface of the double cone is perpendicular to the water inlet direction.

[0009] Furthermore, the double cone matches the shape of the mud bucket.

[0010] Furthermore, the reflection cone is a right circular cone, and its vertex is arranged directly below the outlet of the water inlet system.

[0011] Furthermore, the diversion device includes: a first right circular cone; a second right circular cone, which shares a common bottom surface with the second right circular cone, and the vertex of the second right circular cone, the vertex of the first right circular cone, and the center point of the outlet of the water inlet system are on the same vertical line.

[0012] Furthermore, the flow guiding device includes:

[0013] The height of the second right circular cone is greater than the height of the first right circular cone.

[0014] Furthermore, the slope of the mud bucket is smaller than the slope of the second right circular cone slope.

[0015] Furthermore, it also includes: a reflection cone, which is arranged between the guide device and the outlet of the water inlet system.

[0016] Furthermore, it also includes: a drainage system, which is arranged on the top of the sedimentation tank and is used to discharge the clean water after sedimentation; wherein, the drainage system includes: a scum baffle, which is arranged in the tank wall and matches the shape of the tank wall, surrounding the entire sedimentation tank; a drainage channel, which is arranged on the top of the scum baffle, the scum baffle serves as one of the side plates of the drainage channel, and the other side plate of the drainage channel is at the same horizontal height as the top of the scum baffle.

[0017] Furthermore, it also includes: a water inlet system, which is arranged at the top of the sedimentation tank and extends to the inside of the sedimentation tank, for allowing sewage to enter the sedimentation tank and / or adding drugs to the sewage; wherein the water inlet system includes: a water inlet pipe, which is arranged at the top of the tank; a dosing pipe, which is arranged at the top of the tank; a first reactor, the first reactor is connected to the water inlet pipe and the dosing pipe respectively; a first concentrating pipe, the first concentrating pipe is connected to the reactor, and the axial area of the first concentrating pipe is smaller than the cross-sectional area of the first reactor; a second reactor, the second reactor is connected to the first concentrating pipe; a second concentrating pipe, the second concentrating pipe is connected to the reactor, and the axial area of the second concentrating pipe is smaller than the cross-sectional area of the second reactor; a slow-release pipe, which is connected to the second concentrating pipe.

[0018] According to another aspect of the present invention, there is provided a sewage treatment system comprising the vertical flow sedimentation tank described in any one of the above solutions.

[0019] (3) Beneficial effects

[0020] The above technical solution of the present invention has the following beneficial technical effects:

[0021] The vertical flow sedimentation tank of the present invention improves the sludge discharge efficiency by arranging a diversion device at the mud hopper at the bottom of the tank. The sludge at the bottom of the tank can be fully discharged, the water carried out by mixed discharge is reduced, the sludge discharge efficiency is improved and the water content of the discharged sludge is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of a vertical flow sedimentation tank according to one embodiment of the present invention.

[0023] Figure 2 Schematic diagram of a water inlet system and a drainage system according to one embodiment of the present invention.

[0024] Figure 3 is a schematic diagram of a drainage system according to another embodiment of the present invention.

[0025] Reference numerals:

[0026] 1: Mud discharge system; 11: Mud hopper; 12: Mud discharge pipe; 13: Diversion device; 131: First right circular cone; 132: Second right circular cone; 14: Reflection cone; 15: Mud discharge valve; 2: Drainage system; 21: Scum baffle; 22: Drainage channel; 23: Dovetail groove; 3: Water inlet system; 31: Water inlet pipe; 32: Dosing pipe; 33: First reactor; 34: First concentrator; 35: Second reactor; 36: Second concentrator; 37: Slow-release pipe. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0028] The accompanying drawings illustrate schematic diagrams of layer structures according to embodiments of the present invention. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes, relative sizes, and positional relationships of the various regions and layers shown in the figures are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions based on actual needs.

[0029] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] The present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, identical elements are represented by similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale.

[0032] Figure 1 Schematic diagram of a vertical flow sedimentation tank according to one embodiment of the present invention.

[0033] like Figure 1 As shown, in one embodiment of the present invention, a vertical flow sedimentation tank is provided, comprising a sludge discharge system 1 disposed at the bottom of the sedimentation tank and a water inlet system 3 disposed at the center of the top of the sedimentation tank. The sludge discharge system 1 comprises a sludge hopper 11 disposed at the bottom of the sedimentation tank, the bottom end of the sludge hopper 11 being connected to a sludge discharge pipe 12; and a diversion device 13 disposed directly below the outlet of the water inlet system 3 for draining sludge. The vertical flow sedimentation tank of the present invention improves sludge discharge efficiency by providing a diversion device at the bottom of the sludge hopper, allowing the sludge at the bottom of the tank to be fully discharged, reducing the water carried over by mixed discharge, improving sludge discharge efficiency, and reducing the water content of the discharged sludge.

[0034] In an optional embodiment, the vertical flow sedimentation tank may further include: a mud discharge valve 15, wherein the mud discharge valve 15 is connected to the mud discharge pipe 12 and is used to control the mud discharge pipe 12 to start / stop mud discharge.

[0035] In an optional embodiment, the flow guiding device 13 is a double cone.

[0036] In an optional embodiment, the bottom surface of the double cone is perpendicular to the water inlet direction.

[0037] In an optional embodiment, the double cone matches the shape of the mud bucket 11.

[0038] In a preferred embodiment, the vertical flow sedimentation tank is a circular tank, and the mud hopper 11 is a conical hopper.

[0039] In a preferred embodiment, the vertical flow sedimentation tank body is cylindrical and made of carbon steel or fiberglass.

[0040] In a preferred embodiment, the reflective cone 14 is a right circular cone, the apex of which is located directly below the outlet of the water inlet system 3. The reflective cone 14 is a conical umbrella-shaped device, with the tip pointing upward toward the outlet of the water inlet system 3 and the bottom parallel to the horizontal plane of the pool body.

[0041] The sewage is buffered and distributed by the umbrella-shaped reflective cone 14 from the outlet of the water inlet system 3, enters the sedimentation area and buffer zone of the sedimentation tank, and is concentrated to form solid matter, thereby achieving solid-water separation.

[0042] In a preferred embodiment, the diversion device 13 may include: a first right circular cone 131; a second right circular cone 132, which shares a common bottom surface with the second right circular cone 132, and the vertex of the second right circular cone 132, the vertex of the first right circular cone 131, and the center point of the outlet of the water inlet system 3 are on the same vertical line.

[0043] In an optional embodiment, the flow guiding device 13 may include: the height of the second right circular cone 132 is greater than the height of the first right circular cone 131 .

[0044] In an optional embodiment, the slope of the mud bucket 11 is smaller than the slope of the inclined surface of the second right circular cone 132 .

[0045] The diversion device 13 is a hollow right circular cone, which is fixed on the slope of the funnel-shaped mud hopper 11 by four symmetrical vertical connecting parts. The right circular cone diversion device 13 is vertically downward close to the mud discharge port. The right circular cone diversion device 13 and the slope of the bottom of the funnel-shaped mud hopper 11 form an angle of 25 degrees, and a diversion groove is formed between the side of the cone and the slope of the bottom of the funnel-shaped mud hopper 11.

[0046] Under the influence of its own gravity and water pressure, the sludge is forced into the sludge discharge pipe 12. Due to the presence of the diversion device 13 above the sludge outlet, the outer surface of the diversion device 13 and the slope of the pool bottom together form a diversion channel, through which the sludge is pressed into the sludge discharge outlet. The sludge in the center of the pool bottom is not hollowed out by the water, and the sludge originally deposited on the slope of the pool bottom can be completely discharged.

[0047] In an optional embodiment, the vertical flow sedimentation tank is a triangular columnar tank, and the mud hopper 11 is a triangular pyramid hopper.

[0048] In an optional embodiment, the reflective cone is a right triangular pyramid.

[0049] In an optional embodiment, the vertical flow sedimentation tank is a quadrangular prism tank, and the mud hopper 11 is a quadrangular pyramid hopper.

[0050] In an optional embodiment, the reflective cone is a right quadrangular pyramid.

[0051] In an optional embodiment, the vertical flow sedimentation tank is a multi-prism tank, and the mud hopper 11 is a multi-cone hopper.

[0052] In an optional embodiment, the reflection cone is a right polygonal pyramid.

[0053] In an optional embodiment, the vertical flow sedimentation tank may further include: a reflection cone 14 , which is arranged between the guide device 13 and the outlet of the water inlet system 3 .

[0054] Figure 2 Schematic diagram of a water inlet system and a drainage system according to one embodiment of the present invention.

[0055] like Figure 2 As shown, in an optional embodiment, the sedimentation tank may further include: a drainage system 2, which is arranged on the top of the sedimentation tank and is used to discharge the clean water after sedimentation.

[0056] In an optional embodiment, the drainage system 2 may include: a scum baffle 21, which is arranged inside the pool wall and matches the shape of the pool wall, surrounding the entire sedimentation tank. The scum baffle 21 and the pool wall form a guide channel (drainage path).

[0057] In an optional embodiment, the scum baffle 21 and the pool wall form a water outlet diversion channel (drainage path) with a width of about 30 mm and a depth of about 500 mm, replacing the traditional water outlet channel without a water channel baffle, thereby improving the water quality of the outlet water.

[0058] In an optional embodiment, the drainage system 2 may include: a drainage channel 22, which is arranged on the top of the scum baffle 21, the scum baffle 21 serving as one of the side panels of the drainage channel 22, and the other side panel of the drainage channel 22 is at the same horizontal height as the top of the scum baffle 21.

[0059] In an optional embodiment, a dovetail groove 23 is formed on the top of the scum baffle 21 .

[0060] A dovetail trough 23 is arranged at the top of the sedimentation tank, parallel to the tank wall, with a gap of approximately 30 mm between it and the tank wall. The scum baffle 21 outside the dovetail trough 23 has a dovetail trough 23 at its upper end and extends downward approximately 500 mm from its lower end. When the water level in the sedimentation tank reaches the height of the dovetail trough 23, the gap between the scum baffle 21 and the tank wall forms a water outlet diversion channel. Clean water flows through the outlet diversion channel, then over the dovetail trough 23 and into the drainage channel 22. Scum and foam that typically appear on the surface of the sedimentation tank water cannot enter the drainage channel 22, ensuring that the effluent is free of scum and improving the water quality.

[0061] Figure 3 is a schematic diagram of a drainage system according to another embodiment of the present invention.

[0062] like Figure 3 As shown, in an optional embodiment, the drainage system 2 may include: a drainage channel 22, which is arranged on the outside of the top of the pool wall, the pool wall serves as one of the side panels of the drainage channel 22, and the other side panel of the drainage channel 22 is at the same horizontal height as the top of the pool wall.

[0063] In an optional embodiment, a dovetail groove 23 is provided on the top of the pool wall.

[0064] In an optional embodiment, the drainage channel 22 is connected to a drainage pipeline.

[0065] A dovetail trough 23 is located at the top of the sedimentation tank. The lower end of the scum baffle 21 extends downward by approximately 500 mm. When the water level in the sedimentation tank reaches the height of the dovetail trough 23, the gap between the scum baffle 21 and the tank wall forms a water outlet diversion channel. Clean water flows through the outlet diversion channel, over the dovetail weir, and into the drainage channel 22. Scum and foam, which typically appear on the surface of the sedimentation tank, are prevented from entering the outlet trough, ensuring that the effluent is free of scum and improving the water quality.

[0066] In an optional embodiment, a valve is provided on the drainage pipeline, and the valve is used to control the drainage system 2 to start / stop drainage.

[0067] Existing sedimentation tanks often have light scum floating on the water surface, flowing through the dovetail groove along with the clean water into the drainage channel, affecting the effluent quality. In the sedimentation tank of the present invention, clean water rises along the path formed by the scum baffle 21 and the tank wall, crosses the dovetail groove 23, enters the drainage channel 22, and is discharged. By reducing the width of the drainage path and draining mud around the sedimentation tank wall, scum is effectively prevented from flowing out with the clean water, improving drainage quality and increasing sewage treatment efficiency.

[0068] In an optional embodiment, a flow restriction is provided between the scum baffle 21 and the pool wall, which further reduces the width of the drainage path between the scum baffle 21 and the pool wall, thereby further reducing the scum carried away by the clean water.

[0069] In an optional embodiment, the distance between the scum baffle 21 and the pool wall is 20-50 mm.

[0070] In an optional embodiment, the drainage system 2 may further include: a drainage pipe, which is connected to the drainage channel 22 and is provided with a valve.

[0071] Through the design of the scum baffle 21 on the outside of the drainage channel 22, the scum baffle 21 cooperates with the pool wall to limit the width of the water outlet path, and further limits the discharge of scum mainly concentrated in the center of the pool body. The overly narrow water outlet path is away from the main area of scum, avoiding surface scum from entering the drainage channel 22, thereby improving the water quality of the outlet water.

[0072] In an optional embodiment, the sedimentation tank may further include: a water inlet system 3, which is arranged on the top of the sedimentation tank and extends to the interior of the sedimentation tank, for allowing sewage to enter the sedimentation tank and / or adding drugs to the sewage.

[0073] In an optional embodiment, the water inlet system 3 may include: a water inlet pipe 31, which is arranged at the top of the pool; a dosing pipe 32, which is arranged at the top of the pool; a first reactor 33, which is connected to the water inlet pipe 31 and the dosing pipe 32 respectively; a first concentrating pipe 34, which is connected to the reactor and has an axial area smaller than the cross-sectional area of the first reactor 33; a second reactor 35, which is connected to the first concentrating pipe 34; a second concentrating pipe 36, which is connected to the reactor and has an axial area smaller than the cross-sectional area of the second reactor 35; and a slow-release pipe 37, which is connected to the second concentrating pipe 36. The provision of the dosing pipe 32, the first reactor 33, and the second reactor 35 simplifies the dosing process, eliminates the need for a separate reaction tank, thereby saving construction costs and improving the efficiency of the drug mixing reaction.

[0074] In an optional embodiment, the outlet of the slow-release tube 37 is located in the center of the sedimentation tank.

[0075] The water inlet pipe 31 is controlled by a water inlet valve and is arranged horizontally with the top surface of the sedimentation tank. The water inlet pipe 31 extends to the center of the sedimentation tank, bends downward 90 degrees, opens vertically downward, and is connected to the reactor.

[0076] The dosing pipe 32 and the water inlet pipe 31 are both arranged on the top of the pool (or connected), the dosing pipe 32 is connected to a timing metering valve, and the other end is connected to the medicine tank.

[0077] In an alternative embodiment, the first reactor 33 is located at the center of the sedimentation tank, connected vertically to the water inlet pipe and extending vertically downward toward the center of the tank. The reactors (first reactor 33 and second reactor 35) have two or more diameter changes: the thicker tube serves as the reactor, and the thinner tubes serve as concentrators (second concentrator 36 and first concentrator 34). The ends of the reactor tubes are connected to the slow-release tube 37.

[0078] The center of the slow-release tube 37 is vertically connected to the reaction tube and parallel to the horizontal plane of the sedimentation tank.

[0079] In another embodiment of the present invention, a sewage treatment system is provided, comprising the vertical flow sedimentation tank described in any one of the above technical solutions.

[0080] The raw water enters a reactor arranged in parallel with the sedimentation tank by means of power lifting or gravity flow, and is fully mixed and stirred with the chemical agents added at the same time to react, so that the suspended matter is quickly flocculated into alum flowers, and then enters the sedimentation area and buffer zone of the sedimentation tank to form solid matter, thereby realizing solid-water separation. The clear water flows through the inclined pipe arranged in the middle of the sedimentation tank, rises to the top of the tank, and is discharged through the horizontal weir overflow drainage channel 22. The solid matter settles to the V-shaped trough in the sludge area at the bottom of the tank and is concentrated and then discharged through the discharge device.

[0081] After a period of natural sedimentation or coagulation sedimentation, the cement in the sedimentation tank is layered, with the upper and middle layers being clear water and the lower layer being sludge.

[0082] The drainage channel 22 is set at the top of the sedimentation tank. The drainage channel 22 is flush with the upper end of the tank wall and surrounds the tank wall. The upper layer of clear water after the sedimentation reaction flows into the drainage channel 22 through the dovetail groove 23 and then into the drainage pipe to enter the next process.

[0083] It has improved work efficiency overall, reduced construction and operation and maintenance costs, and improved mud and water quality.

[0084] The sedimentation tank workflow of the present invention is as follows:

[0085] The user opens the water inlet valve, and sewage enters the first reactor 33 through the water inlet pipe 31 .

[0086] The user opens the timed metering valve, and the medicine enters the first reactor 33 through the dosing pipe 32 .

[0087] After the sewage and the medicine are preliminarily mixed and reacted in the first reactor 33, they flow into the first concentration pipe 34, undergo a first-stage concentration, and then enter the second reactor 35. The sewage after the preliminarily reaction is impacted and stirred inside the pipe wall, and is fully mixed and reacted with the added medicine.

[0088] After the mixed reaction, the sewage and the reagent flow into the slow-release tube 37, where they are buffered and distributed by the umbrella-shaped reflective cone 14. The sewage then enters the sedimentation tank's settling zone and buffer zone, where it is concentrated to form solids, achieving solid-water separation. Once in the sedimentation tank, the sewage undergoes flocculation, and the agglomerated suspended matter, under the action of gravity, coagulates and settles to the bottom of the tank, forming sludge.

[0089] Under the influence of its own gravity and water pressure, the sludge is forced into the sludge discharge pipe 12. Due to the presence of the diversion device 13 above the sludge outlet, the outer surface of the diversion device 13 and the slope of the pool bottom together form a diversion channel, through which the sludge is pressed into the sludge discharge outlet. The sludge in the center of the pool bottom is not hollowed out by the water, and the sludge originally deposited on the slope of the pool bottom can be completely discharged.

[0090] Clean water in the sedimentation tank flows through the scum baffle 21 and the tank wall, forming a diversion channel, then flows through the dovetail groove 23 and into the drain channel 22. Opening the valve on the drain pipe allows the clean water in the drain channel 22 to be discharged for reuse. Scum and foam, which typically appear on the surface of the sedimentation tank, are prevented from entering the drain channel 22, ensuring that the effluent is free of scum and improving the water quality.

[0091] The present invention is intended to protect a vertical flow sedimentation tank and sewage treatment system, comprising a sludge discharge system 1 disposed at the bottom of the sedimentation tank and a water inlet system 3 disposed at the center of the top of the sedimentation tank. The system comprises: a sludge hopper 11 disposed at the bottom of the sedimentation tank, the bottom end of the sludge hopper 11 being connected to a sludge discharge pipe 12; and a diversion device 13 disposed directly below the outlet of the water inlet system 3 for draining sludge. The vertical flow sedimentation tank of the present invention improves sludge discharge efficiency by providing a diversion device at the bottom of the sludge hopper. This allows for sufficient discharge of sludge from the bottom of the tank, reduces water carried over from mixed discharge, improves sludge discharge efficiency, and reduces the water content of the discharged sludge.

[0092] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A vertical flow sedimentation tank, comprising a mud discharge system (1) arranged at the bottom of the sedimentation tank and a water inlet system (3) arranged at the top center of the sedimentation tank, characterized in that: It includes: mud A hopper (11) is provided at the bottom of the sedimentation tank, the bottom end of the hopper (11) being connected to a sludge discharge pipe (12); a flow guide device (13) is provided just below the outlet of the water inlet system (3) for draining sludge; and a reflective cone (14) is provided between the flow guide device (13) and the outlet of the water inlet system (3); The diversion device (13) matches the shape of the mud bucket (11); The diversion device (13) comprises: a first right circular cone (131); a second right circular cone (132) which shares a bottom surface with the first right circular cone (131); the vertex of the second right circular cone (132), the vertex of the first right circular cone (131), and the center point of the outlet of the water inlet system (3) are on the same vertical line; a diversion groove is formed between the outer surface of the diversion device (13) and the bottom slope of the mud hopper (11), and the sludge is pressed into the mud outlet through the diversion groove; The height of the second right circular cone (132) is greater than the height of the first right circular cone (131); the second right circular cone (132) is located below the first right circular cone (131); The system further comprises: a water inlet system (3), which is arranged on the top of the sedimentation tank and extends to the interior of the sedimentation tank, and is used to allow sewage to enter the sedimentation tank and / or add drugs to the sewage; wherein the water inlet system (3) comprises: a water inlet pipe (31), which is arranged on the top of the tank; a drug dosing pipe (32), which is arranged on the top of the tank; a first reactor (33), the first reactor (33) being connected to the water inlet pipe (31) and the drug dosing pipe (32) respectively; a first concentrating pipe (34), the first concentrating pipe (34) being connected to the first reactor, and the first concentrating pipe (34) having a The cross-sectional area is smaller than the cross-sectional area of the first reactor (33); the second reactor (35), the second reactor (35) is connected to the first concentrating pipe (34); the second concentrating pipe (36), the second concentrating pipe (36) is connected to the second reactor, and the cross-sectional area of the second concentrating pipe (36) is smaller than the cross-sectional area of the second reactor (35); the slow-release pipe (37), which is connected to the second concentrating pipe (36); the slope of the mud hopper (11) is smaller than the slope of the inclined surface of the second right circular cone (132).

2. The vertical flow sedimentation tank according to claim 1, characterized in that The reflection cone is a right circular cone, and its apex is arranged directly below the outlet of the water inlet system (3).

3. The vertical flow sedimentation tank according to any one of claims 1 or 2, characterized in that: Also includes: A drainage system (2) is provided on the top of a sedimentation tank for discharging clean water after sedimentation; wherein the drainage system (2) comprises: a scum baffle (21) provided inside the tank wall and matching the shape of the tank wall, surrounding the entire sedimentation tank; a drainage channel (22) provided on the top of the scum baffle (21), the scum baffle (21) serving as one of the side plates of the drainage channel (22), and the other side plate of the drainage channel (22) being at the same level as the top of the scum baffle (21).

4. A sewage treatment system, characterized in that: It comprises the vertical flow sedimentation tank described in any one of claims 1 to 3.

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