A sewage treatment dosing device for sewage treatment and its usage method

By designing a stirring device with rotation and swing functions, the problem of low mixing efficiency between flocculant and sewage in existing sewage treatment equipment is solved, efficient sewage treatment is achieved, and cost and resource waste are reduced.

CN119977119BActive Publication Date: 2025-06-13POWERCHINA ZHONGNAN ENG
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Patent Information

Application Number
CN202510479427.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-04-17
Publication Date
2025-06-13
Estimated Expiration
2045-04-17

AI Technical Summary

Technical Problem

The existing drug-added sewage treatment device is inefficient in the mixing process of flocculant and sewage, which affects the treatment effect, and replacing new equipment will increase costs and cause waste of resources.

Method used

A drug-dollar wastewater treatment device for sewage treatment is designed, including a spindle, a mixing module and a control module. Through the rotation of the spindle and the reciprocating movement of the sliding seat, the stirring rod is driven to rotate and swing, so that the flocculant and the sewage are in full contact.

Benefits of technology

The rapid and full mixing of flocculant and sewage has been achieved, the sewage treatment efficiency has been improved, production costs have been reduced, and existing equipment has been effectively utilized to support the development of the green economy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention is applicable to the technical field of sewage treatment, and provides a chemical dosing sewage treatment device for sewage treatment and its usage method. The device includes a top plate, and further includes: a main shaft, a medicine feeding hole is opened at the top of the main shaft, and a medicine discharging hole is opened on its side wall; a mixing module, the mixing module includes a fixed seat and a sliding seat, a plurality of stirring rods are arranged in a circular array around the fixed seat, the top of the stirring rod is hinged to the fixed seat through a hinge rod, and the bottom of the stirring rod is hinged to the sliding seat through a connecting rod; a control module, the control module is installed on the top plate and connected to the sliding seat, and the control module is used to drive the main shaft to rotate and drive the sliding seat to reciprocate synchronously along the axial direction of the main shaft. This device can be matched with various traditional sewage treatment equipment to realize the upgrade of the equipment. While saving costs, it effectively improves the working efficiency of the equipment.
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Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device for adding medicine to sewage and a using method thereof. Background Art

[0002] Adding medicine to sewage treatment is a common physicochemical treatment method, mainly used to remove suspended solids, colloidal substances and dissolved pollutants in sewage. This method adds specific chemical agents to the sewage, causing chemical reactions of the pollutants to form flocs that are easy to precipitate or filter, so as to achieve the purpose of purifying water quality.

[0003] In the prior art, most of the sewage treatment devices for adding medicine are composed of a stirring mechanism and a medicine adding mechanism, which are independent of each other. The specified flocculant is added into the device through the medicine adding mechanism, and then stirred and mixed by the stirring mechanism to achieve sewage treatment. However, most of such devices only use simple structures such as stirring rods for stirring, and at the same time, the medicine adding mechanism mainly inputs the flocculant into the sewage from above, which makes the flocculant unable to be quickly and fully mixed with the sewage, affecting the treatment efficiency.

[0004] Of course, with the development of technology, there are gradually emerging sewage treatment devices for adding medicine with multiple mixing modes. However, if the traditional sewage treatment device for adding medicine is directly replaced with a new device, although the treatment efficiency can be improved, it will inevitably increase the production cost. At the same time, directly eliminating the old device that still has working ability also causes certain waste of resources, which is not conducive to the development of the green economy. Therefore, there is a need for a device that can be applied to the original sewage treatment device for adding medicine to further improve its performance on the basis of the original function. Summary of the Invention

[0005] An object of an embodiment of the present invention is to provide a sewage treatment device for adding medicine to sewage and a using method thereof, aiming to solve the problems raised in the above background art.

[0006] An embodiment of the present invention is implemented as follows. A sewage treatment device for adding medicine to sewage includes a top plate, and further includes:

[0007] A main shaft, the main shaft is rotatably installed on the top plate, a medicine feeding hole for feeding sewage treatment medicine is opened at the top of the main shaft, a medicine discharging hole is opened on the side wall of the main shaft, and the medicine discharging hole is communicated with the medicine feeding hole;

[0008] Mixing module, the mixing module includes a fixed seat fixedly installed on the side wall of the main shaft, and a sliding seat slidably installed on the main shaft along the axial direction of the main shaft. The sliding seat is located below the fixed seat. A number of stirring rods are arranged in a circular array around the fixed seat, and the top of the stirring rod is hinged to the side wall of the fixed seat through a hinge rod. The bottom of each stirring rod is hinged with a connecting rod, and one end of the connecting rod away from the stirring rod is hinged to the side wall of the sliding seat; when the stirring rod is in the vertical state, the sliding seat will completely cover the medicine discharging hole;

[0009] Control module, the control module is installed on the top plate and connected to the sliding seat. The control module is used to drive the main shaft to rotate and drive the sliding seat to reciprocate synchronously along the axial direction of the main shaft.

[0010] Further technical solution, the control module includes a connecting ring, a sliding ring and a mounting disc. The connecting ring and the sliding ring are both slidably installed on the main shaft. The mounting disc is fixedly installed on the top of the main shaft, and a driving unit for driving the mounting disc to rotate is also arranged on the top plate; the sliding ring is arranged between the top plate and the mounting disc, the connecting ring is arranged between the top plate and the fixed seat, and a number of return springs are also arranged between the connecting ring and the fixed seat. When not affected by external forces, the elastic force of the return spring will make the connecting ring located at the upper limit position; a transmission rod is installed at the bottom of the connecting ring, and the end of the transmission rod away from the connecting ring passes through the fixed seat and is connected to the sliding seat; a number of pressing rods are arranged at the bottom of the sliding ring, and the bottom of the pressing rod is always in contact with the upper surface of the connecting ring; an inclined adjusting seat is also arranged below the mounting disc, and a top rod in contact with the lower surface of the adjusting seat is installed on the upper surface of the sliding ring.

[0011] Further technical solution, the adjusting seat is of a ring structure, one side of which is hinged to the lower surface of the mounting disc, and a return torsion spring is arranged at the hinge between the adjusting seat and the mounting disc to always make the adjusting seat receive an upward turning force. An adjusting unit for adjusting the inclination of the adjusting seat is also arranged on the mounting disc.

[0012] Further technical solution, the adjusting unit includes a telescopic member installed on the mounting disc, and a pressing block is installed at the telescopic end of the telescopic member, and the pressing block abuts against the upper end surface of the non-hinged side of the adjusting seat.

[0013] Further technical solution, the driving unit includes a driving motor installed on the top plate, the output end of the driving motor is connected with a driving gear, a transmission gear is installed on the mounting disc, and the driving gear meshes with the transmission gear.

[0014] Further technical solution, the dimension of the sliding seat along the axial direction of the main shaft is larger than the dimension of the medicine discharging hole along the radial direction of the main shaft.

[0015] A further technical solution, the usage method of the sewage treatment device includes the following steps:

[0016] Step 1: First, remove the top cover of the original equipment, then fixedly install the top plate onto it through fasteners, and place the mixing module entirely inside the equipment;

[0017] Step 2: Deliver the sewage treatment agent into the dosing channel and start the control module;

[0018] Step 3: Drive the main shaft to rotate through the control module and simultaneously drive the sliding seat to slide along the axial direction of the main shaft. The main shaft drives the fixed seat to rotate synchronously. The sliding seat drives the stirring rods to rotate synchronously around the axis of the main shaft through the hinge rods; at the same time, the sliding seat drives each stirring rod to rotate around the hinge point of the hinge rod through the connecting rod, so that each stirring rod swings periodically while rotating; in addition, during the up and down sliding of the sliding seat, the sewage treatment agent can be periodically put into the sewage from the middle of the equipment through the dosing holes, enabling the sewage treatment agent to quickly and fully contact the sewage in the upper, middle, and lower parts, thereby treating the sewage.

[0019] A dosing sewage treatment device and its usage method for sewage treatment provided by an embodiment of the present invention. When in use, first remove the top cover of the original equipment, then fixedly install the top plate onto it through fasteners, and place the mixing module entirely inside the equipment; deliver the sewage treatment agent (flocculant) into the dosing channel and start the control module; drive the main shaft to rotate through the control module and simultaneously drive the sliding seat to slide along the axial direction of the main shaft. The main shaft can drive the fixed seat to rotate synchronously. The sliding seat can drive the stirring rods to rotate synchronously around the axis of the main shaft through the hinge rods; at the same time, the sliding seat can drive each stirring rod to rotate around the hinge point of the hinge rod through the connecting rod, so that each stirring rod swings periodically while rotating; in addition, during the up and down sliding of the sliding seat, the sewage treatment agent can be periodically put into the sewage, enabling the sewage treatment agent to quickly and fully contact the sewage in the upper, middle, and lower parts, realizing the efficient treatment of sewage. This device can be matched with various traditional sewage treatment equipment, is convenient for disassembly and assembly, can quickly upgrade the equipment, and while saving costs, effectively improves the working efficiency of the equipment. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a dosing sewage treatment device for sewage treatment provided by an embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of a dosing sewage treatment device for sewage treatment provided by an embodiment of the present invention from the bottom perspective;

[0022] Figure 3 A structural schematic diagram of the top view of a sewage treatment dosing device provided by an embodiment of the present invention;

[0023] Figure 4 is Figure 3 an enlarged view of part A in

[0024] Figure 5 A structural schematic diagram of the main shaft of a sewage treatment dosing device provided by an embodiment of the present invention;

[0025] Figure 6 A structural schematic diagram of the cooperation between the sliding seat and the medicine discharging hole of a sewage treatment dosing device provided by an embodiment of the present invention.

[0026] In the drawings: top plate 1; main shaft 2; medicine feeding hole passage 21; medicine discharging hole 22; mixing module 3; fixed seat 31; sliding seat 32; connecting rod 33; stirring rod 34; hinged rod 341; control module 4; transmission rod 41; connecting ring 42; return spring 43; sliding ring 44; pressing rod 441; adjusting seat 45; ejector rod 46; mounting disc 47; adjusting unit 5; telescopic member 51; pressing block 52; driving unit 6; driving motor 61; driving gear 62; transmission gear 63. Detailed implementation manners

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0029] As Figures 1-5 shown, a sewage treatment dosing device provided by an embodiment of the present invention includes a top plate 1, and further includes:

[0030] A main shaft 2, the main shaft 2 is rotatably installed on the top plate 1, a medicine feeding hole passage 21 for discharging sewage treatment drugs is opened at the top of the main shaft 2, a medicine discharging hole 22 is opened on the side wall of the main shaft 2, and the medicine discharging hole 22 is communicated with the medicine feeding hole passage 21;

[0031] Mixing module 3, the mixing module 3 includes a fixed seat 31 fixedly installed on the side wall of the main shaft 2, and a sliding seat 32 slidably installed on the main shaft 2 along the axial direction of the main shaft 2. The sliding seat 32 is located below the fixed seat 31. A plurality of stirring rods 34 are arranged in a circular array around the fixed seat 31, and the top of the stirring rod 34 is hinged to the side wall of the fixed seat 31 through a hinge rod 341. The bottom of each stirring rod 34 is hinged with a connecting rod 33, and one end of the connecting rod 33 away from the stirring rod 34 is hinged to the side wall of the sliding seat 32; when the stirring rod 34 is in a vertical state, the sliding seat 32 will completely cover the medicine discharging hole 22;

[0032] Control module 4, the control module 4 is installed on the top plate 1 and connected to the sliding seat 32. The control module 4 is used to drive the main shaft 2 to rotate and drive the sliding seat 32 to reciprocate synchronously along the axial direction of the main shaft 2.

[0033] In the embodiment of the present invention, it should be supplemented and stated here that in Figure 5 the circle at the position corresponding to the medicine feeding channel 21 represents a partial section view. The usage method of the sewage treatment device includes the following steps:

[0034] Step 1: First, remove the top cover of the original equipment, and then fixedly install the top plate 1 on it through fasteners, and make the mixing module 3 as a whole placed inside the equipment;

[0035] Step 2: Transport the sewage treatment agent (flocculant) to the medicine feeding channel 21, and start the control module 4;

[0036] Step 3: Drive the main shaft 2 to rotate through the control module 4 and synchronously drive the sliding seat 32 to slide along the axial direction of the main shaft 2. The main shaft 2 can drive the fixed seat 31 to rotate synchronously. The sliding seat 32 can drive the stirring rod 34 to rotate synchronously around the axis of the main shaft 2 through the hinge rod 341; at the same time, the sliding seat 32 can drive each stirring rod 34 to rotate around the hinge point of the hinge rod 341 through the connecting rod 33, so that each stirring rod 34 swings periodically while rotating; in addition, during the up and down sliding of the sliding seat 32, the sewage treatment agent can be periodically put into the sewage through the medicine discharging hole 22 (directly feeding medicine from the middle of the equipment can make the sewage treatment agent quickly and fully contact with the sewage in the upper, middle and lower parts), and the sewage can be treated efficiently.

[0037] Such as Figures 1-4As shown, as a preferred embodiment of the present invention, the control module 4 includes a connecting ring 42, a sliding ring 44 and a mounting disc 47. The connecting ring 42 and the sliding ring 44 are both slidably mounted on the main shaft 2. The mounting disc 47 is fixedly mounted on the top of the main shaft 2, and a driving unit 6 for driving the mounting disc 47 to rotate is further provided on the top plate 1. The sliding ring 44 is arranged between the top plate 1 and the mounting disc 47, the connecting ring 42 is arranged between the top plate 1 and the fixed seat 31, and a plurality of return springs 43 are further arranged between the connecting ring 42 and the fixed seat 31. When no external force acts, the elastic force of the return spring 43 will make the connecting ring 42 located at the upper limit position. A transmission rod 41 is installed at the bottom of the connecting ring 42, and one end of the transmission rod 41 away from the connecting ring 42 penetrates through the fixed seat 31 and is connected to the sliding seat 32. A plurality of pressing rods 441 are arranged at the bottom of the sliding ring 44, and the bottom of the pressing rod 441 always abuts against the upper surface of the connecting ring 42. An inclined adjusting seat 45 is further arranged below the mounting disc 47, and a top rod 46 abutting against the lower surface of the adjusting seat 45 is installed on the upper surface of the sliding ring 44.

[0038] In the embodiment of the present invention, the transmission rod 41 is penetrated through the fixed seat 31 along the axial direction of the main shaft 2, so that the sliding seat 32 and the connecting ring 42 can both rotate synchronously with the fixed seat 31. There is no need to set a sliding key structure, which can make the structure of the main shaft 2 simpler. During use, only need to drive the mounting disc 47 to rotate through the driving unit 6. The mounting disc 47 can drive the main shaft 2 and the adjusting seat 45 to rotate synchronously. Through the cooperation of the adjusting seat 45 and the top rod 46, and the elastic force provided by the return spring 43, the sliding ring 44 will perform a reciprocating up and down movement (the sliding ring 44 does not rotate synchronously with the main shaft 2). The sliding ring 44 can drive the connecting ring 42 to move synchronously through the pressing rod 441, and the connecting ring 42 can drive the sliding seat 32 to move up and down synchronously along the axial direction of the main shaft 2 through the transmission rod 41, thereby driving each stirring rod 34 to swing synchronously.

[0039] As Figure 3 and Figure 4 shown, as a preferred embodiment of the present invention, the adjusting seat 45 is of a ring structure, one side of which is hinged to the lower surface of the mounting disc 47, and a return torsion spring is arranged at the hinge joint of the adjusting seat 45 and the mounting disc 47 for making the adjusting seat 45 always receive an upward turning force to ensure that the adjusting seat 45 will not turn downward under the action of gravity. An adjusting unit 5 for adjusting the inclination of the adjusting seat 45 is further arranged on the mounting disc 47.

[0040] In the embodiment of the present invention, the inclination of the mounting disc 47 is adjusted through the adjusting unit 5, so as to adjust the stroke of the reciprocating movement of the sliding ring 44. Finally, after being transmitted to the sliding seat 32, the swing amplitude of the stirring rod 34 can be adjusted.

[0041] As Figure 4 shown, as a preferred embodiment of the present invention, the adjusting unit 5 includes a telescopic member 51 mounted on the mounting disc 47. A pressing block 52 is mounted on the telescopic end of the telescopic member 51, and the pressing block 52 abuts against the upper end surface of the non-hinged side of the adjusting seat 45.

[0042] In the embodiment of the present invention, the telescopic member 51 can be an electric telescopic rod or a pneumatic telescopic rod, etc. During use, only need to control the telescopic member 51 to expand and contract, and the telescopic member 51 can drive the pressing block 52 to move up and down synchronously. Due to the action of the reset torsion spring, the upper end surface of the adjusting seat 45 can always abut against the pressing block 52. By adjusting the position of the pressing block 52, the inclination of the adjusting seat 45 can be adjusted.

[0043] As Figure 3 and Figure 4 shown, as a preferred embodiment of the present invention, the driving unit 6 includes a driving motor 61 mounted on the top plate 1. The output end of the driving motor 61 is connected to a driving gear 62. A transmission gear 63 is mounted on the mounting disc 47, and the driving gear 62 meshes with the transmission gear 63. During use, only need to start the driving motor 61, and the driving motor 61 can drive the driving gear 62 to rotate synchronously. Through the cooperation of the driving gear 62 and the transmission gear 63, the mounting disc 47 can be driven to rotate, and then the main shaft 2 can be driven to rotate synchronously.

[0044] As Figure 6 shown, as a preferred embodiment of the present invention, the dimension of the sliding seat 32 along the axial direction of the main shaft 2 is larger than the dimension of the medicine discharging hole 22 along the radial direction of the main shaft 2, so that the sliding seat 32 can always cover the medicine discharging hole 22 during the movement within a certain range. It can prevent sewage from backflowing into the medicine feeding hole passage 21 from the medicine discharging hole 22 when no medicine is added.

[0045] Working principle: When in use, first remove the top cover of the original equipment, and then fix and install the top plate 1 (the top plate 1 can be customized according to the specific dimensions of the equipment) onto it through fasteners, and place the entire mixing module 3 inside the equipment, thus completing the modification of the traditional equipment. Then, convey the sewage treatment agent (flocculant) into the dosing channel 21, and start the driving motor 61. The driving motor 61 can drive the driving gear 62 to rotate synchronously. Through the cooperation of the driving gear 62 and the transmission gear 63, the mounting disc 47 can be driven to rotate. The mounting disc 47 can drive the main shaft 2 and the adjusting seat 45 to rotate synchronously. The main shaft 2 can drive the fixed seat 31 to rotate synchronously. The sliding seat 32 can drive the stirring rod 34 to rotate synchronously around the axis of the main shaft 2 through the hinge rod 341. At the same time, through the cooperation of the adjusting seat 45 and the ejector rod 46, and the elastic force provided by the return spring 43, the sliding ring 44 will perform reciprocating up and down movements (the sliding ring 44 does not rotate synchronously with the main shaft 2). The sliding ring 44 can drive the connecting ring 42 to move synchronously through the pressing rod 441. The connecting ring 42 can drive the sliding seat 32 to move up and down along the axial direction of the main shaft 2 synchronously through the transmission rod 41. During the up and down sliding of the sliding seat 32, the sewage treatment agent can be periodically put into the sewage through the dosing hole 22. At the same time, the sliding seat 32 can drive each stirring rod 34 to rotate around the hinge point of the hinge rod 341 through the connecting rod 33, so that each stirring rod 34 performs periodic swinging while rotating, so that the sewage treatment agent can quickly and fully contact the sewage in the upper, middle and lower parts, realizing the efficient treatment of the sewage.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sewage treatment device for treating sewage with a chemical, comprising a top plate, characterized in that: Also includes: A main shaft, the main shaft is rotatably mounted on the top plate, a dosing channel for dosing sewage treatment drugs is provided on the top of the main shaft, a drug discharge hole is provided on the side wall of the main shaft, and the drug discharge hole is communicated with the dosing channel; A mixing module, the mixing module comprises a fixed seat fixedly mounted on the side wall of the main shaft, and a sliding seat slidably mounted on the main shaft along the axial direction of the main shaft, the sliding seat is located below the fixed seat, a plurality of stirring rods are arranged around the fixed seat, and the top of the stirring rod is hinged to the side wall of the fixed seat through a hinge rod, the bottom of each stirring rod is hinged to a connecting rod, and one end of the connecting rod away from the stirring rod is hinged to the side wall of the sliding seat; when the stirring rod is in a vertical state, the sliding seat will completely cover the drug discharge hole; A control module is installed on the top plate and connected to the sliding seat. The control module is used to drive the main shaft to rotate and drive the sliding seat to synchronously reciprocate along the axial direction of the main shaft.

2. The sewage treatment device with added chemicals for sewage treatment according to claim 1, characterized in that: The control module includes a connecting ring, a sliding ring and a mounting plate, the connecting ring and the sliding ring are both slidably mounted on the main shaft, the mounting plate is fixedly mounted on the top of the main shaft, and a driving unit for driving the mounting plate to rotate is also provided on the top plate; the sliding ring is arranged between the top plate and the mounting plate, the connecting ring is arranged between the top plate and the fixed seat, and a plurality of reset springs are also arranged between the connecting ring and the fixed seat, and when no external force is applied, the elastic force of the reset spring will cause the connecting ring to be located at the upper limit position; a transmission rod is installed at the bottom of the connecting ring, and the end of the transmission rod away from the connecting ring passes through the fixed seat and is connected to the sliding seat; a plurality of pressure rods are arranged at the bottom of the sliding ring, and the bottom of the pressure rod is always in contact with the upper surface of the connecting ring; an inclined adjustment seat is also arranged below the mounting plate, and a push rod in contact with the lower surface of the adjustment seat is installed on the upper surface of the sliding ring.

3. The sewage treatment device with added chemicals for sewage treatment according to claim 2, characterized in that: The adjustment seat is an annular structure, one side of which is hinged to the lower surface of the mounting plate, and a reset torsion spring is provided at the hinge between the adjustment seat and the mounting plate to ensure that the adjustment seat is always subjected to an upward flipping force. The mounting plate is also provided with an adjustment unit for adjusting the inclination of the adjustment seat.

4. The sewage treatment device with added chemicals for sewage treatment according to claim 3 is characterized in that: The adjustment unit comprises a telescopic member installed on the installation plate, a pressing block is installed at the telescopic end of the telescopic member, and the pressing block abuts against the upper end surface of the non-hinged side of the adjustment seat.

5. The sewage treatment device for sewage treatment with chemicals according to claim 2, characterized in that: The driving unit comprises a driving motor installed on the top plate, an output end of the driving motor is connected with a driving gear, a transmission gear is installed on the mounting plate, and the driving gear is meshed with the transmission gear.

6. The sewage treatment device with added chemicals for sewage treatment according to claim 1, characterized in that: The dimension of the sliding seat along the axial direction of the main shaft is greater than the dimension of the drug discharge hole along the radial direction of the main shaft.

7. A method for using a sewage treatment device for adding chemicals, based on the sewage treatment device for adding chemicals according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: First remove the top cover of the original device, then fix the top plate onto it with fasteners, and place the hybrid module as a whole inside the device; Step 2: transport the sewage treatment agent to the dosing channel and start the control module; Step 3: The main shaft is driven to rotate through the control module and the sliding seat is driven to slide along the axial direction of the main shaft synchronously. The main shaft drives the fixed seat to rotate synchronously. The sliding seat drives the stirring rod through the hinge rod to rotate synchronously with the axis of the main shaft as the rotation center. At the same time, the sliding seat drives each stirring rod to rotate around the hinge point of the hinge rod through the connecting rod, so that each stirring rod swings periodically while rotating. In addition, in the process of the sliding seat sliding up and down, the sewage treatment agent will be periodically injected into the sewage from the middle of the equipment through the discharge hole, so that the sewage treatment agent can quickly and fully contact the sewage in the upper, middle and lower parts, thereby treating the sewage.

Citation Information

Patent Citations

  • Wastewater dosing and stirring device

    CN210303344U

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    CN222042730U