Efficient sedimentation tank for sewage treatment

By designing a sewage treatment sedimentation tank that includes high -efficiency mixing, filtering and mud scraping mechanism, the problem of low efficiency of existing sedimentation tanks has been solved, the efficient precipitation and sludge of sewage are achieved, and the overall sewage treatment is improved. efficiency.

CN222389653UActive Publication Date: 2025-01-24GUANGDONG HAIYU INTELLIGENT EQUIP GRP CO LTD
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Patent Information

Application Number
CN202420980034.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-08
Publication Date
2025-01-24
Estimated Expiration
2034-05-08

AI Technical Summary

Technical Problem

The existing sewage treatment sedimentation tanks have a long time during the stirring process, resulting in low precipitation efficiency and cannot effectively solve the precipitation problem in sewage treatment.

Method used

A high -efficiency sedimentation tank includes a circular pool, high -efficiency hybrid mechanism, filtering mechanism, and mud scraping mechanism. The high -efficiency hybrid institutions combine the efficient mixes of sewage and flocculant through the efficient mixing of sewage and flocculants through the middle baffle, right baffle and left baffle to combine the efficient stirring of mixing motors, mixing rods and mixing films. The filter mechanism achieves separation of residue and filtering of water purification through the combination of waterproof motors, spiral sheets and grille plates. The mud scraping mechanism achieves the mud scraping through the cooperation of the mud motor, the mud rod and the scraper.

Benefits of technology

Through the efficient mixing of the high-efficiency mixing mechanism and the effective separation of the filtering mechanism, sewage can quickly complete sedimentation, improving the sedimentation efficiency. The use of the sludge scraping mechanism ensures timely removal of sludge, avoids clogging of the sedimentation tank, and improves the overall sewage treatment efficiency.

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Abstract

The utility model discloses a high-efficiency sedimentation tank for sewage treatment. The high-efficiency sedimentation tank comprises a circular water tank, a high-efficiency mixing mechanism, a filtering mechanism and a sludge scraping mechanism, a rectangular water tank is arranged on the left side of the circular water tank, the upper sides of the circular water tank and the rectangular water tank are fixedly connected with an upper side mounting plate, and a placement groove is formed in the right side of the upper side mounting plate; the efficient mixing mechanism comprises a middle baffle, a right baffle and a left baffle, the middle baffle is fixedly connected to the middle between the front inner wall and the rear inner wall of the rectangular water tank, the left baffle is fixedly connected to the left between the front inner wall and the rear inner wall of the rectangular water tank, and the right baffle is arranged on the right between the front inner wall and the rear inner wall of the rectangular water tank; the upper ends of the middle baffle, the right baffle and the left baffle are fixedly connected with the lower surface of the upper mounting plate; the filtering mechanism is arranged in the placing groove; according to the efficient sedimentation tank for sewage treatment, sewage can be settled in a segmented manner, and the efficiency is high.
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Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a high-efficiency sedimentation tank for sewage treatment. Background Art

[0002] A large amount of sewage is generated in human life and industrial production. Due to the shortage of water resources in my country, the treatment and reuse of sewage is of great significance. Sewage sedimentation is one of the important links in sewage treatment:

[0003] The internal operation of the sedimentation tank is as follows: add flocculants, then use a stirring mechanism to mix the sewage and flocculants so that the sewage can flocculate inside, and then flocculate;

[0004] There are some problems, so the stirring mechanism takes a long time to stir, and sedimentation cannot occur during the stirring process, so the overall sedimentation tank efficiency is low. For this reason, we propose a high-efficiency sedimentation tank for sewage treatment. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a high-efficiency sedimentation tank for sewage treatment, which has good continuity and high efficiency and can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-efficiency sedimentation tank for sewage treatment, comprising a circular water tank, a high-efficiency mixing mechanism, a filtering mechanism and a mud scraping mechanism;

[0007] Circular pool: A rectangular pool is provided on the left side thereof, and the upper sides of the circular pool and the rectangular pool are fixedly connected to an upper mounting plate, and a placement groove is provided on the right side of the upper mounting plate;

[0008] High-efficiency mixing mechanism: it includes a middle baffle, a right baffle and a left baffle, the middle baffle is fixedly connected to the middle between the front and rear inner walls of the rectangular water pool, the left baffle is fixedly connected to the left side between the front and rear inner walls of the rectangular water pool, and the right baffle is provided on the right side between the front and rear inner walls of the rectangular water pool, and the upper ends of the middle baffle, the right baffle and the left baffle are fixedly connected to the lower surface of the upper mounting plate;

[0009] Filter mechanism: It is arranged inside the placement tank;

[0010] Sludge scraping mechanism: It is arranged at the lower right end of the upper mounting plate. The sewage can be precipitated in sections with high efficiency.

[0011] Furthermore, it also includes a single-chip microcomputer, which is located outside the circular pool. The input end of the single-chip microcomputer is electrically connected to an external power supply to control the normal operation of the electrical appliance.

[0012] Furthermore, the high-efficiency mixing mechanism also includes a stirring motor, a stirring rod and a stirring blade. The stirring motor is evenly and fixedly connected to the upper surface of the upper mounting plate. The output shafts of the two stirring motors are fixedly connected to the stirring rod. The lower ends of the two stirring rods are provided with evenly distributed stirring blades. The input ends of the two stirring motors are respectively electrically connected to the output ends of the single-chip microcomputer to realize the function of high-efficiency mixing.

[0013] Furthermore, the filtering mechanism includes an installation box, a circular water inlet, a waterproof motor, a spiral sheet, a grille plate and a handle. The installation box is slidably connected to the inside of the placement groove. The left and right walls of the placement groove are both provided with evenly distributed rectangular openings. The left wall of the installation box is provided with a circular water inlet. The middle part of the inner wall of the circular water inlet is fixedly connected with a waterproof motor through a fixing frame. The output shaft of the waterproof motor is fixedly connected with a spiral sheet. Evenly distributed grille plates are fixedly connected between the front and rear inner walls of the installation box. Handles are symmetrically provided on the upper side of the installation box. A sludge outlet is provided at the bottom of the circular water pool. The input end of the waterproof motor is electrically connected to the output end of the single-chip microcomputer. The sludge outlet is connected to an external sludge pump to realize the function of scum separation.

[0014] Furthermore, the scraping mechanism includes a scraping motor, a scraping rod, a scraper and a mounting frame. The scraping motor is fixedly connected to the right side of the upper surface of the upper mounting plate. The output shaft of the scraping motor is fixedly connected to the scraping rod. The lower end of the scraping rod is fixedly connected to the scraper through the mounting frame. The input end of the scraping motor is electrically connected to the output end of the single-chip microcomputer to realize the function of scraping away mud and dirt.

[0015] Furthermore, it also includes flocculant inlet pipes, which are symmetrically connected to the rear side of the rectangular water pool. The upper side of the left side of the rectangular water pool is connected to a water inlet pipe, which is connected to an external water supply device. The two flocculant inlet pipes are respectively connected to external feeding equipment to achieve the function of adding flocculants.

[0016] Furthermore, it also includes a clean water tank, which is arranged at the upper end of the right side of the outer arc surface of the circular pool. Water outlets are respectively opened on the front and rear sides of the left side of the clean water tank, and a water outlet hole is opened on the right side of the placement tank to realize the function of clean water discharge.

[0017] Furthermore, it also includes an outer bracket, which is fixedly connected to the lower side of the circular pool and the rectangular pool respectively to achieve a supporting function.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the high-efficiency sedimentation tank for sewage treatment has the following advantages:

[0019] 1. The sewage on the upper side flows into the interior of the installation box through the rectangular opening. At this time, the external single-chip microcomputer is regulated to operate the waterproof motor. The output shaft of the waterproof motor rotates, thereby driving the spiral blade to operate. During the rotation of the spiral blade, the scum is broken up, and the scum is separated by the grille plate. The clean water flows into the clean water tank through the rectangular opening on the right. The water in the clean water tank flows out of the sedimentation tank through the outlet, which can effectively prevent the cross-flow from causing secondary pollution of the treated water by the scum. The installation box is easy to disassemble and clean.

[0020] 2. At this time, the external sewage enters the sedimentation tank through the water inlet pipe. At this time, the single-chip microcomputer is regulated, and the two stirring motors are running. The speed of the stirring motor on the left is faster than that of the stirring motor on the right, which drives the two stirring rods to rotate, and then drives the two sets of stirring blades to rotate. The speed of the stirring blade on the left is faster than that of the stirring blade on the right. At the same time, the external feeding equipment is regulated, and the flocculants at different positions enter the pipe to allow different flocculants to enter the interior of the rectangular pool. At this time, the sewage between the left inner wall of the rectangular pool and the left baffle is efficiently mixed with the flocculant and the stirring blade on the left, and then the sewage enters between the middle baffle and the left baffle through the connecting port at the bottom of the left baffle. At this time, the stirring blade on the right stirs the sewage and mixes the sewage and the flocculant for a second time. At this time, the sewage flows into the middle baffle and the right baffle through the guide of the connecting port at the bottom of the middle baffle, and then flows into the interior of the circular pool through the upper side of the right baffle. After sedimentation, the sewage can be precipitated in sections with high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic cross-sectional view of the high-efficiency mixing mechanism of the utility model;

[0023] Figure 3 It is a schematic diagram of the enlarged structure of point A of the utility model.

[0024] In the figure: 1 circular water pool, 2 rectangular water pool, 3 high-efficiency mixing mechanism, 31 stirring motor, 32 stirring rod, 33 stirring blade, 34 middle baffle, 35 right baffle, 36 left baffle, 4 upper mounting plate, 5 flocculant inlet pipe, 6 water inlet pipe, 7 placement slot, 8 filtering mechanism, 81 mounting box, 82 circular water inlet, 83 waterproof motor, 84 spiral blade, 85 grille plate, 86 handle, 9 scraping mechanism, 91 scraping motor, 92 scraping rod, 93 scraper, 94 mounting frame, 10 clean water tank, 11 water outlet, 12 outer bracket, 13 single chip computer. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-3 , this embodiment provides a technical solution: a high-efficiency sedimentation tank for sewage treatment, comprising a circular water tank 1, a high-efficiency mixing mechanism 3, a filtering mechanism 8 and a sludge scraping mechanism 9;

[0027] Circular pool 1: A rectangular pool 2 is provided on the left side thereof. The upper sides of the circular pool 1 and the rectangular pool 2 are fixedly connected to an upper mounting plate 4. A placement slot 7 is provided on the right side of the upper mounting plate 4. The circular pool 1 also includes a single-chip microcomputer 13. The single-chip microcomputer 13 is located outside the circular pool 1. The input end of the single-chip microcomputer 13 is electrically connected to an external power supply. The circular pool 1 also includes a flocculant inlet pipe 5. The flocculant inlet pipe 5 is symmetrically connected to the rear side of the rectangular pool 2. The upper side of the left side of the rectangular pool 2 is connected to a water inlet pipe 6. The water inlet pipe 6 is externally connected to an external water supply device. The two The flocculant inlet pipe 5 is respectively connected to the external feeding equipment, and also includes a clean water tank 10, which is arranged at the upper right end of the outer arc surface of the circular water pool 1, and the left side of the clean water tank 10 is respectively provided with water outlets 11 on the front and rear sides, and the right side of the placement tank 7 is provided with a water outlet hole, and also includes an outer bracket 12, which is respectively fixedly connected to the lower side of the circular water pool 1 and the rectangular water pool 2. The high-efficiency sedimentation tank is placed at the designated station through the outer bracket 12, and the external sewage enters the sedimentation tank through the water inlet pipe 6;

[0028] High-efficiency mixing mechanism 3: It includes a middle baffle 34, a right baffle 35 and a left baffle 36. The middle baffle 34 is fixedly connected to the middle part between the front and rear inner walls of the rectangular water pool 2. The left baffle 36 is fixedly connected to the left side between the front and rear inner walls of the rectangular water pool 2. A right baffle 35 is provided on the right side between the front and rear inner walls of the rectangular water pool 2. The upper ends of the middle baffle 34, the right baffle 35 and the left baffle 36 are all fixedly connected to the lower surface of the upper mounting plate 4. The high-efficiency mixing mechanism 3 also includes a stirring motor 31, a stirring rod 32 and a stirring blade 33. The stirring motor 31 is evenly fixedly connected to the upper surface of the upper mounting plate 4. The output shafts of the two stirring motors 31 are fixedly connected to the stirring rods 32. The lower ends of the two stirring rods 32 are provided with evenly distributed stirring blades 33. The input ends of the two stirring motors 31 are respectively electrically connected to the output ends of the single-chip microcomputer 13. The single-chip microcomputer 13 is regulated and the two stirring motors 31 are in operation. The speed of the stirring motor 31 is faster than that of the stirring motor 31 on the right side, thereby driving the two stirring rods 32 to rotate, and then driving the two groups of stirring blades 33 to rotate. The speed of the stirring blade 33 on the left side is faster than that of the stirring blade 33 on the right side. At the same time, the external feeding equipment is regulated, and the flocculant inlet pipes 5 at different positions allow different flocculants to enter the interior of the rectangular water pool 2. At this time, the sewage between the left inner wall of the rectangular water pool 2 and the left baffle 36 is efficiently mixed with the flocculant and the stirring blade 33 on the left side, and then the sewage enters between the middle baffle 34 and the left baffle 36 through the connecting port at the bottom of the left baffle 36. At this time, the stirring blade 33 on the right side stirs the sewage and mixes the sewage and the flocculant for a second time. At this time, the sewage flows into between the middle baffle 34 and the right baffle 35 through the guide of the connecting port at the bottom of the middle baffle 34, and then flows into the interior of the circular water pool 1 through the upper side of the right baffle 35;

[0029] Filter mechanism 8: It is arranged inside the placement slot 7. The filter mechanism 8 includes a mounting box 81, a circular water inlet 82, a waterproof motor 83, a spiral sheet 84, a grille plate 85 and a handle 86. The mounting box 81 is slidably connected to the inside of the placement slot 7. The left and right walls of the placement slot 7 are both provided with evenly distributed rectangular openings. The left wall of the mounting box 81 is provided with a circular water inlet 82. The middle part of the inner wall of the circular water inlet 82 is fixedly connected to the waterproof motor 83 through a fixing frame. The output shaft of the waterproof motor 83 is fixedly connected to the spiral sheet 84. The front and rear inner walls of the mounting box 81 are fixedly connected to evenly distributed grille plates 85. The mounting box 81 is provided with a plurality of The upper side surface is symmetrically provided with handles 86, and the bottom of the circular pool 1 is provided with a sludge outlet. The input end of the waterproof motor 83 is electrically connected to the output end of the single-chip computer 13, and the sludge outlet is connected to an external sludge pump. Then, after sedimentation, the sewage on the upper side flows into the interior of the installation box 81 through the rectangular opening. At this time, the external single-chip computer 13 is regulated, the waterproof motor 83 is operated, and the output shaft of the waterproof motor 83 is rotated, thereby driving the spiral piece 84 to operate. During the rotation of the spiral piece 84, the scum is broken up, and the scum is separated by the grid plate 85. The clean water flows into the clean water tank 10 through the rectangular opening on the right, and the water in the clean water tank 10 flows out of the sedimentation tank through the outlet 11;

[0030] Scraping mechanism 9: It is arranged at the lower right end of the upper mounting plate 4. The scraping mechanism 9 includes a scraping motor 91, a scraping rod 92, a scraper 93 and a mounting frame 94. The scraping motor 91 is fixedly connected to the right side of the upper surface of the upper mounting plate 4. The output shaft of the scraping motor 91 is fixedly connected to the scraping rod 92. The lower end of the scraping rod 92 is fixedly connected to the scraper 93 through the mounting frame 94. The input end of the scraping motor 91 is electrically connected to the output end of the single-chip microcomputer 13. When too much sludge accumulates at the bottom of the circular water pool 1, the single-chip microcomputer 13 is regulated to operate the scraping motor 91. The output shaft of the scraping motor 91 rotates slowly, thereby driving the scraping rod 92 to rotate slowly, and then driving the scraper 93 to rotate through the mounting frame 94, thereby scraping the bottom wall of the circular water pool 1, and then regulating the external sewage pump to discharge the sludge.

[0031] The working principle of a high-efficiency sedimentation tank for sewage treatment provided by the utility model is as follows: the high-efficiency sedimentation tank is placed on a designated workstation through an outer bracket 12, and the external sewage is then introduced into the sedimentation tank through a water inlet pipe 6. At this time, the single-chip microcomputer 13 is regulated, and the two stirring motors 31 are in operation, and the rotation speed of the stirring motor 31 on the left side is faster than that of the stirring motor 31 on the right side, thereby driving the two stirring rods 32 to rotate, thereby driving the two groups of stirring blades 33 to rotate, and the rotation speed of the stirring blade 33 on the left side is faster than that of the stirring blade 33 on the right side. At the same time, the external feeding equipment is regulated, and the flocculant inlet pipe 5 at different positions introduces different flocculants into the interior of the rectangular water pool 2. At this time, the sewage located between the left inner wall of the rectangular water pool 2 and the left baffle 36 is efficiently mixed by the flocculant and the stirring blade 33 on the left side, and then the sewage enters between the middle baffle 34 and the left baffle 36 through the connecting port at the bottom of the left baffle 36. At this time, the stirring blade 33 on the right side stirs the sewage to perform secondary mixing of the sewage and the flocculant. At this time, the sewage flows into the middle baffle 34 and the right baffle 35 through the guide of the connecting port at the bottom of the middle baffle 34, and then flows into the inside of the circular pool 1 through the upper side of the right baffle 35. After sedimentation, the sewage on the upper side flows into the inside of the installation box 81 through the rectangular port. At this time, the external single-chip computer 13 is regulated, the waterproof motor 83 is operated, and the output shaft of the waterproof motor 83 is rotated, thereby driving the spiral piece 84 to operate. During the rotation of the spiral piece 84, the scum is broken up, and the scum passes through the grille plate 85 partition, clean water flows into the clean water tank 10 through the rectangular opening on the right, the water in the clean water tank 10 flows out of the sedimentation tank through the outlet 11, when too much sludge accumulates at the bottom of the circular water pool 1, the single chip microcomputer 13 is regulated, the sludge scraper motor 91 is operated, the output shaft of the sludge scraper motor 91 rotates slowly, and then drives the sludge scraper rod 92 to rotate slowly, and then drives the scraper plate 93 to rotate through the mounting frame 94, and then scrapes the bottom wall of the circular water pool 1, and then regulates the external sewage pump to discharge the sludge.

[0032] It is worth noting that the single chip microcomputer 13 disclosed in the above embodiment is specifically model S7-200, and the stirring motor 31, the waterproof motor 83 and the scraper motor 91 can be freely configured according to the actual application scenario. It is recommended to use the DYT series permanent magnet direct drive motor for the stirring motor 31, the DH series DC brush motor for the waterproof motor 83, and the YSIPM-11-6 high-power synchronous motor for the scraper motor 91. The single chip microcomputer 13 controls the stirring motor 31, the waterproof motor 83 and the scraper motor 91 using methods commonly used in the prior art.

[0033] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high-efficiency sedimentation tank for sewage treatment, characterized in that: It comprises a circular water pool (1), a high-efficiency mixing mechanism (3), a filtering mechanism (8) and a mud scraping mechanism (9); The circular pool (1) has a rectangular pool (2) on its left side, the upper sides of the circular pool (1) and the rectangular pool (2) are fixedly connected to an upper mounting plate (4), and a placement groove (7) is provided on the right side of the upper mounting plate (4); The high-efficiency mixing mechanism (3) comprises a middle baffle (34), a right baffle (35) and a left baffle (36), wherein the middle baffle (34) is fixedly connected to the middle part between the front and rear inner walls of the rectangular pool (2), the left baffle (36) is fixedly connected to the left side between the front and rear inner walls of the rectangular pool (2), and the right baffle (35) is provided on the right side between the front and rear inner walls of the rectangular pool (2), and the upper ends of the middle baffle (34), the right baffle (35) and the left baffle (36) are all fixedly connected to the lower surface of the upper mounting plate (4); Filter mechanism (8): it is arranged inside the placement tank (7); Mud scraping mechanism (9): It is arranged at the lower right end of the upper mounting plate (4).

2. The high-efficiency sedimentation tank for sewage treatment according to claim 1, characterized in that: It also comprises a single chip computer (13), wherein the single chip computer (13) is located outside the circular pool (1), and an input end of the single chip computer (13) is electrically connected to an external power supply.

3. A high-efficiency sedimentation tank for sewage treatment according to claim 2, characterized in that: The high-efficiency mixing mechanism (3) further comprises a stirring motor (31), a stirring rod (32) and a stirring blade (33); the stirring motor (31) is evenly and fixedly connected to the upper surface of the upper mounting plate (4); the output shafts of the two stirring motors (31) are both fixedly connected to the stirring rods (32); the lower ends of the two stirring rods (32) are both provided with evenly distributed stirring blades (33); and the input ends of the two stirring motors (31) are respectively electrically connected to the output ends of the single-chip computer (13).

4. The high-efficiency sedimentation tank for sewage treatment according to claim 2, characterized in that: The filtering mechanism (8) comprises a mounting box (81), a circular water inlet (82), a waterproof motor (83), a spiral sheet (84), a grille plate (85) and a handle (86). The mounting box (81) is slidably connected to the interior of the placement groove (7). The left and right walls of the placement groove (7) are both provided with evenly distributed rectangular openings. The left wall of the mounting box (81) is provided with a circular water inlet (82). The middle part of the inner wall of the circular water inlet (82) is fixedly connected to the waterproof motor (83) through a fixing frame. The output shaft of the waterproof motor (83) is fixedly connected to the spiral sheet (84). The front and rear inner walls of the mounting box (81) are fixedly connected to evenly distributed grille plates (85). The upper side surface of the mounting box (81) is symmetrically provided with a handle (86) in front and back. The bottom of the circular water pool (1) is provided with a sludge outlet. The input end of the waterproof motor (83) is electrically connected to the output end of the single-chip computer (13). The sludge outlet is connected to an external sludge pump.

5. The high-efficiency sedimentation tank for sewage treatment according to claim 2, characterized in that: The scraping mechanism (9) comprises a scraping motor (91), a scraping rod (92), a scraper (93) and a mounting frame (94); the scraping motor (91) is fixedly connected to the right side of the upper surface of the upper mounting plate (4); the output shaft of the scraping motor (91) is fixedly connected to the scraping rod (92); the lower end of the scraping rod (92) is fixedly connected to the scraper (93) via the mounting frame (94); and the input end of the scraping motor (91) is electrically connected to the output end of the single-chip computer (13).

6. The high-efficiency sedimentation tank for sewage treatment according to claim 1, characterized in that: It also includes a flocculant inlet pipe (5), which is symmetrically connected to the rear side of the rectangular water pool (2) on the left and right sides. The upper side of the left side of the rectangular water pool (2) is connected to a water inlet pipe (6), and the water inlet pipe (6) is externally connected to an external water supply device. The two flocculant inlet pipes (5) are externally connected to an external feed device.

7. The high-efficiency sedimentation tank for sewage treatment according to claim 1, characterized in that: It also comprises a water purification tank (10), which is arranged at the upper right end of the outer arc surface of the circular pool (1), and the left side of the water purification tank (10) is provided with water outlets (11) at the front and rear sides respectively, and the right side of the placement tank (7) is provided with a water outlet hole.

8. The high-efficiency sedimentation tank for sewage treatment according to claim 1, characterized in that: It also comprises an outer bracket (12), wherein the outer bracket (12) is respectively fixedly connected to the lower side of the circular pool (1) and the rectangular pool (2).