A precise dosing and mixing system for sewage treatment

Abstract

The application discloses a precise dosing and mixing system for sewage treatment, and relates to the technical field of medicament mixing equipment. The bottom base device is provided with a stirring device above, the stirring device comprises a first outer shell, the bottom of the first outer shell is provided with a flow guide table, a plurality of reinforcing base tables are fixedly arranged below the lower end surface of the first outer shell, an impact column matched with the reinforcing base tables is fixedly arranged above the bottom base device, a plurality of limiting heads are uniformly arranged outside the first outer shell, and a plurality of vertical fixing blocks matched with the limiting heads are fixedly arranged above the bottom base device. The limiting heads on the first outer shell are limited to move up and down in the vertical fixing blocks, so that the reinforcing base tables and the impact column collide, the sewage in the first outer shell is subjected to the oscillation force in the vertical direction, the vortex generated by the stirrer is matched to form a certain tearing force, and the sewage and the medicine water are fully mixed.

Description

Technical Field

[0001] This invention relates to the field of pharmaceutical mixing equipment technology, specifically a precise dosing and mixing system for wastewater treatment. Background Technology

[0002] Chemical dosing and mixing is a crucial step in wastewater treatment, primarily aimed at promoting the removal or transformation of pollutants through the addition of chemical agents. Common agents include flocculants, coagulants, and oxidants, which effectively help precipitate, decompose, and remove harmful substances from water. Dosing equipment is typically equipped with precise metering systems to ensure that the dosage of the agent is matched to the water quality conditions, thereby improving treatment efficiency. The mixing process generally employs mechanical or gas agitation to evenly disperse the agent into the wastewater. The efficiency and duration of agitation directly affect the reaction effect of the agent; therefore, the agitation intensity and mixing time need to be adjusted according to the flow rate and properties of the wastewater.

[0003] The invention disclosed in authorization announcement number CN118371171B is a purification agent mixing device and method for sewage treatment. This invention utilizes the weight change of the tank to realize the flexible change of the connection relationship between the stirring shaft and the annular seat. When the agent is added inside the tank, the stirring shaft is disconnected from the annular seat, and the stirring shaft can continuously stir the agent, thereby mixing the sewage and the agent. When the tank needs to be cleaned, the stirring shaft drives the annular seat to rotate, realizing the automatic cleaning of the tank.

[0004] The above-mentioned device can stir and mix sewage and chemicals. However, the device cannot effectively mix sewage and chemicals by relying solely on the stirring shaft and the secondary stirring shaft. The mixing effect of sewage and chemicals located at the bottom and top is poor. In addition, the device cannot accurately add chemicals to sewage, which can easily lead to too much or too little chemicals, making it difficult to treat sewage with the most reasonable dosage. Therefore, a precise chemical dosing and mixing device is needed. Summary of the Invention

[0005] The purpose of this invention is to provide a precise dosing and mixing system for wastewater treatment, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A precise dosing and mixing system for wastewater treatment includes a base device, a stirring device disposed above the base device, a vertical movement control device disposed on one side of the stirring device above the base device, a dosing device cooperating with the stirring device disposed on the rear side of the base device, a wastewater inlet pipe disposed on the stirring device, a wastewater inlet valve disposed on the wastewater inlet pipe, a stirrer disposed on one side of the wastewater inlet pipe on the stirring device, and a plurality of circulation devices evenly disposed at the bottom of the stirring device.

[0008] The stirring device includes a first outer shell, a flow guide platform at the bottom of the first outer shell, a plurality of reinforcing bases fixedly disposed on the lower end face of the first outer shell below the flow guide platform, an impact column cooperating with the reinforcing bases fixedly disposed above the base device, a plurality of upper fixing tubes disposed at the bottom of the first outer shell, a first solenoid valve disposed on the upper fixing tubes, a lower fixing tube slidably disposed at the bottom of the upper fixing tubes, a plurality of limiting heads evenly disposed on the outer side of the first outer shell, and a plurality of vertical fixing blocks cooperating with the limiting heads fixedly disposed above the base device.

[0009] As a further aspect of the present invention: a liquid level sensor is fixedly disposed on the inner wall of the first outer casing.

[0010] As a further aspect of the present invention, an exhaust pressure relief valve is provided above the first outer casing.

[0011] As a further embodiment of the present invention: a collection cavity is provided on the inner side of the base device, a sewage outlet pipe is provided on one side of the base device, and a sewage outlet valve is provided on the sewage outlet pipe.

[0012] As a further embodiment of the present invention: the bottom of the collecting cavity has a slope.

[0013] As a further embodiment of the present invention: the stirrer includes a geared motor, the geared motor is fixedly disposed above the first outer shell, and the output shaft of the geared motor is provided with a multi-layered stirring rod that extends through the top plate of the first outer shell into the first outer shell.

[0014] As a further embodiment of the present invention: the dosing device includes a first medicine tank, a second medicine tank, and a third medicine tank. A second solenoid valve is provided on the output pipe of the first medicine tank, the second medicine tank, and the third medicine tank. A peristaltic pump is provided above the front side of the first medicine tank, the second medicine tank, and the third medicine tank. The output pipe of the first medicine tank, the second medicine tank, and the third medicine tank is connected to the inlet pipe of the peristaltic pump through a T-shaped manifold. An annular manifold is provided above the first outer shell. The outlet pipe of the peristaltic pump is connected to the annular manifold through a second connecting pipe. A first bracket is fixedly provided above the vertical fixing block. A roller is rotatably mounted on the first bracket through a rotating shaft, and the roller is configured to cooperate with the second connecting pipe. A plurality of spray pipes that cooperate with the first outer shell are provided on the annular manifold. A plurality of nozzles are provided on the spray pipes, and the nozzles are located between adjacent upper and lower stirring rods.

[0015] As a further embodiment of the present invention: a compressor is provided on one side of the peristaltic pump, and the air outlet of the compressor is connected to a second connecting pipe through a first connecting pipe, and a third solenoid valve is provided on the first connecting pipe.

[0016] As a further embodiment of the present invention: the vertical movement control device includes a second bracket, an electric push rod is fixedly disposed below the second bracket, a movable seat is fixedly disposed on the output shaft of the electric push rod, a first drive motor is fixedly disposed below the movable seat, an eccentric wheel is fixedly disposed on the output shaft of the first drive motor, a linear guide mechanism is disposed opposite to the second bracket, a rotating seat is disposed on the linear guide mechanism, a lever seat is rotatably disposed on the rotating seat, a sliding seat is slidably disposed at one end of the lever seat, a lifting head is fixedly disposed at the outer end of the sliding seat, a lifting block is fixedly disposed opposite to the bottom of the first outer shell, and a groove is formed on the lower end face of the lifting block to cooperate with the lifting head.

[0017] As a further embodiment of the present invention: the circulating device includes a second outer shell and a third outer shell. A second drive motor is fixedly installed at the upper end of the second outer shell, and the output shaft of the second drive motor passes through the side wall of the second outer shell. A first helical blade mechanism is fixedly installed on the output shaft of the second drive motor. The third outer shell has a hole that matches the first outer shell. A third drive motor is fixedly installed at the outer end of the third outer shell, and the output shaft of the third drive motor passes through the side wall of the third outer shell. A second helical blade mechanism is fixedly installed on the output shaft of the third drive motor.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The upper limit head of the first outer shell moves vertically within the vertical fixed block, causing the reinforcing base to collide with the impact column. This causes the sewage inside the first outer shell to experience vertical vibration (higher density sewage will settle downwards, while lower density sewage will float upwards. Under the action of the circulation device, several circulations are formed, further allowing the sewage and medicine to mix evenly). This facilitates the formation of a certain tearing force in conjunction with the vortex generated by the agitator, making it easier for the sewage and medicine to mix thoroughly and improving the mixing efficiency of the sewage and medicine.

[0020] The peristaltic pump precisely delivers the medicine into the mixing device. The nozzles at different heights pump the medicine into the first outer shell at multiple points and heights, which facilitates efficient and uniform mixing of the medicine and the sewage. The high-pressure air generated by the compressor sprays the residual medicine in the second connecting pipe, the annular collecting pipe, the spray pipe and the nozzle into the first outer shell, avoiding medicine residue, saving medicine usage and improving the utilization rate of medicine, thus improving the operating efficiency of the device.

[0021] The position of the rotating seat is adjusted by the linear guide mechanism, which in turn adjusts the position of the entire lever fulcrum, so that the lengths of the lever arms on both sides of the fulcrum are different. This allows for adjustment of the force applied at both ends of the lever and the lifting height of the lifting head, thereby controlling the vertical movement height of the stirring device. This facilitates adjustment of the vertical tearing force of the sewage inside the first outer shell. The electric push rod controls the height of the first drive motor and the eccentric wheel, which is convenient for coordinating with the adjustment work of the linear guide mechanism. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a top view of the structure of the present invention.

[0024] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0025] Figure 4 For the present invention Figure 3 A magnified three-dimensional structural diagram of a portion of point A in the middle.

[0026] Figure 5 This is a three-dimensional structural diagram of the drug dosing device in this invention.

[0027] Figure 6 This is a partial exploded view of the stirring device in this invention.

[0028] Figure 7 This is a partial three-dimensional structural diagram of the circulating device in this invention.

[0029] Figure 8 This is a schematic diagram of a local three-dimensional structure at the reinforced base in this invention.

[0030] Figure 9 This is a three-dimensional structural diagram of the vertical movement control device in this invention.

[0031] Figure reference numerals: 1. Base device; 11. Collection chamber; 12. Sewage outlet pipe; 13. Sewage outlet valve; 2. Stirring device; 21. First outer shell; 22. Guide platform; 23. Reinforcing base; 25. First solenoid valve; 26. Upper fixing pipe; 27. Lower fixing pipe; 28. Impact column; 29. ​​Limiting head; 210. Vertical fixing block; 3. Dosing device; 31. First medicine tank; 32. Second medicine tank; 33. Third medicine tank; 34. Second solenoid valve; 35. T-shaped collection pipe; 36. Peristaltic pump; 37. Compressor; 38. First connecting pipe; 39. Third solenoid valve; 310. Second connecting pipe; 311. First support; 312. Roller; 31 3. Annular collecting pipe; 314. Nozzle; 315. Nozzle head; 4. Vertical movement control device; 41. Linear guide rail mechanism; 42. Second bracket; 43. Electric push rod; 44. Moving seat; 45. First drive motor; 46. Eccentric wheel; 47. Rotating seat; 48. Lever seat; 49. Sliding seat; 410. Lifting head; 411. Lifting block; 5. Sewage inlet pipe; 6. Sewage inlet valve; 7. Agitator; 71. Gear motor; 72. Stirring rod; 8. Circulation device; 81. Second outer shell; 82. Second drive motor; 83. First helical blade mechanism; 84. Third outer shell; 85. Third drive motor; 86. Second helical blade mechanism. Detailed Implementation

[0032] The following embodiments will describe the present invention in detail with reference to the accompanying drawings. In the drawings or description, similar or identical parts are referred to by the same reference numerals, and in practical applications, the shape, thickness, or height of each component may be enlarged or reduced. The embodiments listed in this invention are merely illustrative and not intended to limit the scope of the invention. Any obvious modifications or changes made to this invention do not depart from the spirit and scope of the invention.

[0033] For examples, please refer to Figures 1-9 In this embodiment of the invention, a precise dosing and mixing system for wastewater treatment includes a base device 1, a stirring device 2 disposed above the base device 1, a vertical movement control device 4 disposed on one side of the stirring device 2 above the base device 1, a dosing device 3 disposed on the rear side of the base device 1 in cooperation with the stirring device 2, a wastewater inlet pipe 5 disposed on the stirring device 2, a wastewater inlet valve 6 disposed on the wastewater inlet pipe 5, a stirrer 7 disposed on one side of the wastewater inlet pipe 5 on the stirring device 2, and a plurality of circulating circulation devices 8 uniformly disposed at the bottom of the stirring device 2.

[0034] The base device 1 has a collection chamber 11 on its inner side. The bottom of the collection chamber 11 has a slope. A sewage outlet pipe 12 is provided on one side of the base device 1. A sewage outlet valve 13 is provided on the sewage outlet pipe 12. The mixed sewage solution is collected through the collection chamber 11 and flows into the next sewage treatment unit through the sewage outlet pipe 12.

[0035] The stirring device 2 includes a first outer shell 21. The bottom of the first outer shell 21 has a guide platform 22. Several reinforcing bases 23 are fixedly disposed below the guide platform 22 on the lower end face of the first outer shell 21. An impact column 28 cooperating with the reinforcing base 23 is fixedly disposed above the base device 1. Several upper fixing tubes 26 are disposed at the bottom of the first outer shell 21. A first solenoid valve 25 is disposed on each upper fixing tube 26. A lower fixing tube 27 is slidably disposed at the bottom of the upper fixing tubes 26 and passes through the base device 1 to communicate with the collecting cavity 11. Several limiting heads 29 are evenly disposed on the outer side of the first outer shell 21. Several vertical supports cooperating with the limiting heads 29 are fixedly disposed above the base device 1. A liquid level sensor is fixedly installed on the inner wall of the first outer shell 21 and an exhaust pressure relief valve is installed above the first outer shell 21. The upper limit head 29 of the first outer shell 21 moves vertically within the vertical fixed block 210, causing the reinforcing base 23 to collide with the impact column 28. This causes the sewage in the first outer shell 21 to generate a vertical oscillation force (the denser sewage will settle downwards and the less dense sewage will float upwards. Under the action of the circulation device 8, several circulations are formed, further allowing the sewage and medicine to mix evenly). This facilitates the formation of a certain tearing force in conjunction with the vortex generated by the stirrer 7, making it easier for the sewage and medicine to mix fully and improving the mixing efficiency of the sewage and medicine.

[0036] The stirrer 7 includes a geared motor 71, which is fixedly mounted above the first outer shell 21. The output shaft of the geared motor 71 is provided with a multi-layered stirring rod 72, which extends through the top plate of the first outer shell 21 and into the first outer shell 21.

[0037] The dosing device 3 includes a first medicine tank 31, a second medicine tank 32, and a third medicine tank 33. A second solenoid valve 34 is installed on the output pipes of the first medicine tank 31, the second medicine tank 32, and the third medicine tank 33. A peristaltic pump 36 is installed above the front side of the first medicine tank 31, the second medicine tank 32, and the third medicine tank 33. The output pipes of the first medicine tank 31, the second medicine tank 32, and the third medicine tank 33 are connected to the inlet pipe of the peristaltic pump 36 via a T-shaped manifold 35. An annular manifold 313 is installed above the first outer casing 21. The outlet pipe of the peristaltic pump 36 is connected to the annular manifold 313 via a second connecting pipe 310. A first bracket 311 is fixedly installed above the vertical fixing block 210. The second connecting pipe 310 is a metal braided pressure-resistant flexible hose. A roller 312 is rotatably mounted on the first bracket 311 via a rotating shaft, and the roller 312 is configured to cooperate with the second connecting pipe 310. The peristaltic pump 36 is located on one side... A compressor 37 is installed, and the air outlet of the compressor 37 is connected to a second connecting pipe 310 via a first connecting pipe 38. A third solenoid valve 39 is installed on the first connecting pipe 38. Several nozzles 314 that cooperate with the first outer shell 21 are installed on the annular manifold 313. Several nozzles 315 are installed on the nozzles 314 and are located between adjacent upper and lower stirring rods 72. The peristaltic pump 36 accurately pumps the medicine into the stirring device 2. The nozzles 315 at different heights pump the medicine into the first outer shell 21 at multiple points and heights, which facilitates efficient and uniform mixing of medicine and sewage. The high-pressure air generated by the compressor 37 sprays the residual medicine in the second connecting pipe 310, the annular manifold 313, the nozzles 314 and the nozzles 315 into the first outer shell 21, avoiding medicine residue, saving medicine consumption and improving the utilization rate of medicine, thus improving the operating efficiency of the device.

[0038] The vertical movement control device 4 includes a second bracket 42, an electric push rod 43 fixedly mounted below the second bracket 42, a movable seat 44 fixedly mounted on the output shaft of the electric push rod 43, a first drive motor 45 fixedly mounted below the movable seat 44, an eccentric wheel 46 fixedly mounted on the output shaft of the first drive motor 45, a linear guide mechanism 41 opposite to the second bracket 42, a rotating seat 47 mounted on the linear guide mechanism 41, a lever seat 48 rotatably mounted on the rotating seat 47, a sliding seat 49 slidably mounted at one end of the lever seat 48, and a lifting head fixedly mounted on the outer end of the sliding seat 49. 410, a lifting block 411 is fixedly provided at the bottom of the first outer shell 21. The lower end face of the lifting block 411 is provided with a groove that cooperates with the lifting head 410. The position of the rotating seat 47 is adjusted by the linear guide mechanism 41, thereby adjusting the position of the entire lever fulcrum, so that the lengths of the lever arms on both sides of the fulcrum are different. This can adjust the magnitude of the force applied at both ends of the lever and the lifting height of the lifting head 410, thereby controlling the vertical movement height of the stirring device 2. This facilitates the adjustment of the magnitude of the vertical tearing force of the sewage in the first outer shell 21. The electric push rod 43 controls the height of the first drive motor 45 and the eccentric wheel 46, which facilitates the adjustment work of the linear guide mechanism 41.

[0039] The circulating device 8 includes a second outer shell 81 and a third outer shell 84. A second drive motor 82 is fixedly installed at the upper end of the second outer shell 81, and the output shaft of the second drive motor 82 passes through the side wall of the second outer shell 81. A first spiral blade mechanism 83 is fixedly installed on the output shaft of the second drive motor 82. The third outer shell 84 has a hole that matches the first outer shell 21. A third drive motor 85 is fixedly installed at the outer end of the third outer shell 84, and the output shaft of the third drive motor 85 passes through the side wall of the third outer shell 84. A second spiral blade mechanism 86 is fixedly installed on the output shaft of the third drive motor 85. The wastewater at the bottom of the first outer shell 21 is fed from the bottom to the top of the first outer shell 21 through the first spiral blade mechanism 83 and the second spiral blade mechanism 86, thereby forming a circulation outside the first outer shell 21, which facilitates the thorough mixing of wastewater and medicine under the action of the stirrer 7.

[0040] When using the device, open the sewage inlet valve 6, and sewage is fed into the first outer casing 21 from the sewage inlet pipe 5. The liquid level sensor inside the first outer casing 21 monitors the sewage level. When the level reaches the designated position, close the sewage inlet valve 6, start the reduction motor 71, and allow the stirring rod 72 to stir the sewage, bringing it to a preliminary mixed state. Then, open the second solenoid valve 34 corresponding to the first medicine tank 31, allowing the medicine in the first medicine tank 31 to be fed into the second connecting pipe 310, the annular collecting pipe 313, the spray pipe 314, and the nozzle 315 under the action of the peristaltic pump 36. The nozzles 315 at different heights pump medicine into the first outer casing 21 at multiple points and heights. The peristaltic pump 36 is turned off, and then the compressor 37 and the third solenoid valve 39 are turned on, allowing compressed air to spray the remaining medicine in the second connecting pipe 310, annular manifold 313, nozzle 314, and nozzles 315 into the first outer casing 21. The linear guide mechanism 41 is activated, and the position of the rotating seat 47 is adjusted (adjusting the fulcrum position; at this time, the lifting head 410 is in the groove of the lifting block 411). Relative displacement occurs between the lever seat 48 and the sliding seat 49, and then... The electric actuator 43 is used to adjust the height of the first drive motor 45 and the eccentric wheel 46. Then, the first drive motor 45 is started. Under the action of the lever, the stirring device 2 moves up and down, while simultaneously increasing the collision between the base 23 and the impact column 28. This generates a downward impact force within the first outer shell 21 (there will be a reaction force at the end of the collision, which affects the upper layer of sewage, such as splashing water, etc. This phenomenon can help further improve the mixing degree). Combined with the stirring force of the stirring rod 72, the mixing degree of sewage and medicine is further improved. Then, the second drive motor 82 is started. The third drive motor 85 forms multiple circulations outside the first outer casing 21, so that the sewage and chemicals are in a circulation flow state, which improves the uniformity of sewage and chemicals mixing. When other chemicals need to be added, the above operation for the dosing device 3 is repeated to complete different dosing processes. After the sewage and chemicals are mixed, the first solenoid valve 25 is opened, allowing the sewage and chemicals in the first outer casing 21 to be collected into the collection chamber 11 through the upper fixed pipe 26 and the lower fixed pipe 27. Finally, the sewage is fed to the next sewage treatment unit from the sewage outlet pipe 12 to complete the mixing of chemicals in the sewage.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A precise dosing and mixing system for wastewater treatment, comprising a base device (1), characterized in that, A stirring device (2) is provided above the base device (1). A vertical movement control device (4) is provided on one side of the stirring device (2) above the base device (1). A dosing device (3) that cooperates with the stirring device (2) is provided on the rear side of the base device (1). A sewage inlet pipe (5) is provided on the stirring device (2). A sewage inlet valve (6) is provided on the sewage inlet pipe (5). A stirrer (7) is provided on one side of the sewage inlet pipe (5) on the stirring device (2). Several circulating circulation devices (8) are evenly provided at the bottom of the stirring device (2). The stirring device (2) includes a first outer shell (21), the bottom of the first outer shell (21) has a flow guide platform (22), the lower end face of the first outer shell (21) is fixedly provided with a plurality of reinforcing bases (23) below the flow guide platform (22), the upper part of the base device (1) is fixedly provided with an impact column (28) that cooperates with the reinforcing base (23), the bottom of the first outer shell (21) is provided with a plurality of upper fixing tubes (26), the upper fixing tubes (26) are provided with a first solenoid valve (25), the bottom of the upper fixing tubes (26) is slidably provided with a lower fixing tube (27), the outer side of the first outer shell (21) is evenly provided with a plurality of limiting heads (29), and the upper part of the base device (1) is fixedly provided with a plurality of vertical fixing blocks (210) that cooperate with the limiting heads (29); The vertical movement control device (4) includes a second bracket (42), an electric push rod (43) is fixedly installed below the second bracket (42), a moving seat (44) is fixedly installed on the output shaft of the electric push rod (43), a first drive motor (45) is fixedly installed below the moving seat (44), an eccentric wheel (46) is fixedly installed on the output shaft of the first drive motor (45), a linear guide mechanism (41) is arranged opposite to the second bracket (42), a rotating seat (47) is arranged on the linear guide mechanism (41), a lever seat (48) is rotatably arranged on the rotating seat (47), a sliding seat (49) is slidably arranged at one end of the lever seat (48), a lifting head (410) is fixedly installed at the outer end of the sliding seat (49), a lifting block (411) is fixedly arranged at the bottom of the first outer shell (21), and a groove that cooperates with the lifting head (410) is opened on the lower end face of the lifting block (411).

2. The precise dosing and mixing system for wastewater treatment according to claim 1, characterized in that, A liquid level sensor is fixedly installed on the inner wall of the first outer shell (21).

3. The precise dosing and mixing system for wastewater treatment according to claim 2, characterized in that, An exhaust pressure relief valve is provided on the top of the first outer shell (21).

4. The precise dosing and mixing system for wastewater treatment according to claim 3, characterized in that, The base device (1) has a collection cavity (11) on its inner side, and a sewage outlet pipe (12) is provided on one side of the base device (1). A sewage outlet valve (13) is provided on the sewage outlet pipe (12).

5. The precise dosing and mixing system for wastewater treatment according to claim 4, characterized in that, The bottom of the collecting cavity (11) has a slope.

6. The precise dosing and mixing system for wastewater treatment according to claim 1, characterized in that, The stirrer (7) includes a geared motor (71), which is fixedly installed above the first outer shell (21). The output shaft of the geared motor (71) is provided with multiple layers of stirring rods (72), and the stirring rods (72) extend through the top plate of the first outer shell (21) into the first outer shell (21).

7. The precise dosing and mixing system for wastewater treatment according to claim 6, characterized in that, The dosing device (3) includes a first medicine tank (31), a second medicine tank (32), and a third medicine tank (33). A second solenoid valve (34) is installed on the output pipes of the first medicine tank (31), the second medicine tank (32), and the third medicine tank (33). A peristaltic pump (36) is installed above the front side of the first medicine tank (31), the second medicine tank (32), and the third medicine tank (33). The output pipes of the first medicine tank (31), the second medicine tank (32), and the third medicine tank (33) are connected to the inlet pipe of the peristaltic pump (36) via a T-shaped manifold (35). An annular manifold (31) is installed above the first outer casing (21). 3) The outlet pipe of the peristaltic pump (36) is connected to the annular manifold (313) through the second connecting pipe (310). A first bracket (311) is fixedly installed above the vertical fixing block (210). A roller (312) is rotatably installed on the first bracket (311) through a rotating shaft, and the roller (312) is configured to cooperate with the second connecting pipe (310). A number of nozzles (314) that cooperate with the first outer shell (21) are provided on the annular manifold (313). A number of nozzles (315) are provided on the nozzles (314), and the nozzles (315) are located between adjacent upper and lower stirring rods (72).

8. The precise dosing and mixing system for wastewater treatment according to claim 7, characterized in that, A compressor (37) is provided on one side of the peristaltic pump (36). The air outlet of the compressor (37) is connected to the second connecting pipe (310) through the first connecting pipe (38). A third solenoid valve (39) is provided on the first connecting pipe (38).

9. The precise dosing and mixing system for wastewater treatment according to claim 8, characterized in that, The circulating device (8) includes a second outer shell (81) and a third outer shell (84). A second drive motor (82) is fixedly installed at the upper end of the second outer shell (81), and the output shaft of the second drive motor (82) passes through the side wall of the second outer shell (81). A first spiral blade mechanism (83) is fixedly installed on the output shaft of the second drive motor (82). The third outer shell (84) has a hole that matches the first outer shell (21). A third drive motor (85) is fixedly installed at the outer end of the third outer shell (84), and the output shaft of the third drive motor (85) passes through the side wall of the third outer shell (84). A second spiral blade mechanism (86) is fixedly installed on the output shaft of the third drive motor (85).

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