A device for treating whitening agent wastewater by three-stage RO

Abstract

The utility model discloses a kind of tertiary RO processing whitening agent wastewater's device, belong to the technical field of whitening agent wastewater's device processing. Including support frame and stirring tank, the top of the support frame is installed with stirring tank, the top of the support frame is installed with filter on the side away from stirring tank, the top of the support frame is installed with water inlet conductivity on the side away from filter, the top of the support frame is installed with pressure switch on the side away from water inlet conductivity. The utility model not only facilitates the monitoring of the running state of the equipment, but also facilitates the separation and transportation of wastewater. It also facilitates the scraping of the inner wall, improves the uniformity of the mixture stirring in the whitening agent wastewater treatment device, and improves the efficiency of the whitening agent wastewater treatment device.

Description

Technical Field

[0001] This utility model relates to the technical field of devices for treating whitening agent wastewater, specifically a three-stage RO treatment device for whitening agent wastewater. Background Technology

[0002] In the production of whitening agents, a large number of materials are involved, and the reactants undergo substitution reactions and hydrolysis at multiple positions. The composition of by-products and impurities is very complex, mainly including DSD acid, aniline, diethanolamine, p-aminobenzenesulfonic acid and other benzene and its derivatives with amino, nitro and sulfonic acid substituent groups. These substances inhibit the activity of microorganisms and are difficult to be degraded by microorganisms, resulting in extremely poor renewability of wastewater. Traditional methods use centralized inlet water intake, which causes uneven water intake to the RO membrane, resulting in low application efficiency of the RO membrane.

[0003] The pore size of the RO membrane is about 0.1 nanometers, allowing only water molecules to pass through. Other impurities and heavy metals are discharged through the wastewater pipe. Since there are still impurities inside the water, high pressure is used to drive water molecules through. During the filtration process, a large number of impurities are easily accumulated and attached to the inlet side of the membrane, increasing the risk of membrane damage. In the three-stage RO membrane treatment, the concentrate from the first RO membrane is used for multiple filtration processes. At the same time, the flow guide channel in the equipment can effectively disperse the water flow and solve the problems of uneven water intake and low membrane utilization.

[0004] Existing devices for treating whitening agent wastewater generally do not facilitate convenient monitoring of equipment operation, easy separation and transportation of wastewater, or easy scraping of the inner walls. This affects the uniformity of mixing the mixture and the efficiency of the whitening agent wastewater treatment device. Utility Model Content

[0005] The purpose of this invention is to provide a three-stage RO treatment device for whitening agent wastewater, in order to solve the problems mentioned in the background art, such as the inconvenience of conveniently monitoring the equipment operation status, conveniently separating and transporting wastewater, and conveniently scraping the inner wall, which affect the uniformity of mixing the mixture and the treatment efficiency of the whitening agent wastewater treatment device.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A three-stage RO treatment device for whitening agent wastewater includes a support frame and a mixing tank. The mixing tank is mounted on the top of the support frame. A filter is mounted on the side of the top of the support frame away from the mixing tank. An inlet water conductivity meter is mounted on the side of the top of the support frame away from the filter. A pressure switch is mounted on the side of the top of the support frame away from the inlet water conductivity meter. A pressure gauge is mounted on the side wall of the pressure switch. A high-pressure pump is mounted on the side of the top of the support frame away from the pressure switch. An RO membrane module is mounted on the side wall of the support frame. Pipeline valve components are mounted on the side wall of the RO membrane module. A water pipe is mounted on the side wall of the mixing tank. The water pipe passes through the filter, inlet water conductivity meter, pressure gauge, pressure switch, and high-pressure pump, extending to the surface of the pipeline valve components and connecting thereto.

[0008] Optionally, an online instrumentation system is installed on the outer wall of the support frame, and a control panel is installed on the side of the outer wall of the support frame near the online instrumentation system. A first end cap is installed on the end of the RO membrane module away from the pipeline valve components, and a second end cap is provided outside the first end cap.

[0009] Optionally, a float flow meter is installed on the side wall of the second end cap. A bend is installed at the output end of the float flow meter. A freshwater and concentrated water detection device is installed at the bottom end of the bend. A flow divider is installed at the bottom end of the freshwater and concentrated water detection device. A stepper motor is installed on the surface of the flow divider. A support shaft is installed at the output end of the stepper motor. The support shaft extends through the flow divider to its outside. A flip plate is fitted on the surface of the support shaft inside the flow divider. The output end of the control panel is electrically connected to the input ends of the inlet conductivity meter, pressure gauge, pressure switch, high-pressure pump, online instrument system, float flow meter, servo motor, freshwater and concentrated water detection device, and stepper motor.

[0010] Optionally, a servo motor is installed at the top of the mixing tank, and a rotating shaft is installed at the output end of the servo motor.

[0011] Optionally, the rotating shaft extends into and is movably connected to the interior of the mixing tank, and the surface of the rotating shaft is fitted with stirring blades.

[0012] Optionally, a support frame is fitted onto the surface of the outer rotating shaft of the stirring blade, and two sets of scraper arms are provided on the outside of the support frame.

[0013] Optionally, two sets of springs are symmetrically installed on the side wall of the support frame, and the side of the springs away from the support frame is connected to the scraper arm.

[0014] Optionally, six sets of equally spaced rotating shafts are movably mounted on the surface of the first end cap, and each rotating shaft is fitted with a rotating wheel.

[0015] Optionally, threaded rods are installed on the surface of each of the rotating wheels, and an annular cover is provided on the outside of the second end cover.

[0016] Optionally, the outer side of the annular cover is provided with six sets of equidistant butterfly nuts, all of which are threadedly connected to the threaded rod, and a U-shaped block is provided on the outer wall of the annular cover on one side of the threaded rod.

[0017] Compared with the prior art, the beneficial effects of this utility model are: the device for treating whitening agent wastewater not only facilitates convenient monitoring of equipment operation status, convenient separation and transportation of wastewater, and convenient scraping of the inner wall, but also improves the uniformity of mixing of the mixture and the treatment efficiency of the whitening agent wastewater treatment device.

[0018] When using a three-stage RO system to treat whitening agent wastewater, the wastewater is introduced into a mixing tank where reactants are added for reaction. After external equipment monitoring confirms pH stability, the valve on the side wall of the mixing tank is opened, allowing the wastewater to flow through a pipe into the filter for filtration. The filtered wastewater's conductivity is then checked to ensure it meets the required standards. If the pass rate is outside the acceptable range, manual adjustment is necessary. The wastewater is then fed through a pressure gauge, which displays the pressure. Once the required pressure is reached, the pressure switch and high-pressure pump are activated, and the wastewater is pumped through pipelines and valves to the RO membrane module for further treatment. After treatment, the wastewater passes through the first end cap and the second end cap. The float flow meter monitors the liquid flow rate of wastewater in real time. The wastewater continues to flow through a bend to the surface of the desalination and concentrate detection equipment. The equipment detects the wastewater. If it is desalination, a stepper motor drives the support shaft to rotate, which in turn drives the tilting plate to rotate to one side of the diversion hood to close one channel. The desalination flows out and is collected through the open channel. If it is concentrate, the stepper motor is reversed to open, allowing the concentrate to flow out and be collected through the other channel. This facilitates convenient monitoring of the equipment's operating status, easy separation and transportation of wastewater, and improves the efficiency of the whitening agent wastewater treatment device.

[0019] When hydrochloric acid needs to be added to the wastewater for mixing, the servo motor drives the rotating shaft to rotate, which in turn drives the stirring blades and support frame to rotate. The stirring blades thoroughly mix the wastewater and hydrochloric acid inside the mixing tank, while the support frame drives the spring and scraper arm to rotate. The spring drives the scraper arm to elastically scrape the inner wall of the mixing tank, which facilitates easy scraping of the inner wall and improves the uniformity of the mixture mixing in the device for treating whitening agent wastewater.

[0020] Tighten multiple sets of wing nuts to disengage them from multiple sets of threaded rods. Rotate the threaded rods around the rotating shaft to disengage them from the U-shaped block. Remove the second end cover and the annular cover. Disassemble and replace the internal components of the RO membrane module through the first end cover. This allows for convenient opening of the RO membrane module in the device for treating whitening agent wastewater, improving the ease of opening the RO membrane module in the device. Attached Figure Description

[0021] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present invention and, together with the specification, further serve to explain the principles of the present invention and enable those skilled in the art to implement and use the present invention.

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

[0023] Figure 2 This is a front view structural diagram of the present utility model;

[0024] Figure 3 This is a three-dimensional structural diagram of the mixing tank of this utility model;

[0025] Figure 4 This is a three-dimensional structural diagram of the support frame of this utility model;

[0026] Figure 5 This is a three-dimensional structural diagram of the second end cap of this utility model;

[0027] Figure 6 This is a three-dimensional structural diagram of the support shaft of this utility model.

[0028] Figure label:

[0029] 1. Support frame; 2. Mixing tank; 3. Filter; 4. Inlet water conductivity meter; 5. Water pipe; 6. Pressure gauge; 7. Pressure switch; 8. High-pressure pump; 9. Pipeline valve components; 10. Online instrumentation system; 11. Control panel; 12. RO membrane module; 13. First end cap; 14. Second end cap; 15. Float flow meter; 16. Bend; 17. Servo motor; 18. Rotating shaft; 19. Agitator blade; 20. Support frame; 21. Spring; 22. Scraper arm; 23. Freshwater and concentrated water testing equipment; 24. Diverter hood; 25. Rotating shaft; 26. Rotating wheel; 27. Threaded rod; 28. Wing nut; 29. ​​Annular cover; 30. Stepper motor; 31. Support shaft; 32. Tilting plate; 33. U-shaped block.

[0030] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiment of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0031] The following is a detailed description of a three-stage RO treatment device for treating whitening agent wastewater provided by this utility model, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit this utility model.

[0032] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0033] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0034] It is understood that the meanings of “on”, “above”, and “above” in this utility model should be interpreted in the broadest manner, such that “on” not only means “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” not only means “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0035] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0036] like Figures 1 to 6 As shown, an embodiment of this utility model provides a three-stage RO treatment device for whitening agent wastewater, including a support frame 1 and a mixing tank 2. The mixing tank 2 is installed at the top of the support frame 1. A filter 3 is installed on the side of the top of the support frame 1 away from the mixing tank 2. An inlet water conductivity meter 4 is installed on the side of the top of the support frame 1 away from the filter 3. A pressure switch 7 is installed on the side of the top of the support frame 1 away from the inlet water conductivity meter 4. A pressure gauge 6 is installed on the side wall of the pressure switch 7. A high-pressure pump 8 is installed on one side. An RO membrane module 12 is installed on the side wall of the support frame 1. A pipeline valve assembly 9 is installed on the side wall of the RO membrane module 12. A water pipe 5 is installed on the side wall of the mixing tank 2. The water pipe 5 passes through the filter 3, the inlet water conductivity meter 4, the pressure gauge 6, the pressure switch 7, and the high-pressure pump 8, extending to the surface of the pipeline valve assembly 9 and connecting thereto. An online instrument system 10 is installed on the outer wall of the support frame 1. The inlet water conductivity meter 4 is connected to the online instrument system 10 via a wire. The outer wall of the support frame 1 is close to the... A control panel 11 is installed on one side of the online instrumentation system 10. A first end cap 13 is installed on the end of the RO membrane module 12 away from the pipeline valve component 9. A second end cap 14 is provided outside the first end cap 13. A float flow meter 15 is installed on the side wall of the second end cap 14. The float flow meter 15 is connected to the online instrumentation system 10 via a wire. A bend 16 is installed at the output end of the float flow meter 15. A freshwater and concentrate detection device 23 is installed at the bottom end of the bend 16. A separator is installed at the bottom end of the freshwater and concentrate detection device 23. The flow shield 24 has a stepper motor 30 mounted on its surface. The output end of the stepper motor 30 is equipped with a support shaft 31, which extends through the flow shield 24 to its exterior. Inside the flow shield 24, the surface of the support shaft 31 is fitted with a flip plate 32. The output end of the control panel 11 is electrically connected to the inlet water conductivity meter 4, pressure gauge 6, pressure switch 7, high-pressure pump 8, online instrument system 10, float flow meter 15, servo motor 17, freshwater and concentrated water detection equipment 23, and the input end of the stepper motor 30.

[0037] When using a three-stage RO system to treat whitening agent wastewater, the wastewater is introduced into the mixing tank 2, reactants are added, and the reaction proceeds. After the pH is stabilized by external equipment, the valve on the side wall of the mixing tank 2 is opened, and the wastewater flows through the water pipe 5 into the filter 3 for filtration. The filtered wastewater is then tested for its pass rate using the inlet conductivity 4, and the data is promptly transmitted to the online instrument system 10 for display. If the pass rate is outside the acceptable range, manual adjustment is required. The wastewater passes through the pressure gauge 6, which displays the pressure. When the required pressure is reached, the pressure switch 7 and the high-pressure pump 8 are activated, and the wastewater is transported to the RO membrane module 12 for treatment through the pipeline valve assembly 9. After treatment, the wastewater passes through the first end cap 13, the second end cap 14, and the float flow meter 15. The float flow meter 15 monitors the liquid flow rate in real time and transmits the data to the surface of the online instrument system 10. The wastewater continues to flow through the bend 16 to the surface of the freshwater and concentrated water detection device 23. The freshwater and concentrated water detection device 23 detects the wastewater. If it is freshwater, the stepper motor 30 is turned on. Under the support of the diversion hood 24, the stepper motor 30 drives the support shaft 31 to rotate. The support shaft 31 drives the flip plate 32 to rotate to one side of the diversion hood 24 to close one channel. The freshwater flows out and is collected through the open channel. If it is concentrated water, the stepper motor 30 is turned on in the opposite direction, so that the concentrated water flows out and is collected from the other side channel. This facilitates convenient monitoring of the equipment's operating status and convenient separation and transportation of wastewater, improving the treatment efficiency of the whitening agent wastewater treatment device. (The inlet conductivity 4 uses the model BEC-6300, the float flowmeter 15 uses the model YGSZ-LLB, and the freshwater and concentrated water detection device 23 uses the model E+H PromassF).

[0038] A servo motor 17 is installed at the top of the mixing tank 2. A rotating shaft 18 is installed at the output end of the servo motor 17. The rotating shaft 18 extends into the interior of the mixing tank 2 and is movably connected thereto. A stirring blade 19 is fitted on the surface of the rotating shaft 18.

[0039] A support frame 20 is fitted on the surface of the outer rotating shaft 18 of the stirring blade 19. Two sets of scraper arms 22 are provided on the outside of the support frame 20. Two sets of springs 21 are symmetrically installed on the side wall of the support frame 20. The side of the springs 21 away from the support frame 20 is connected to the scraper arms 22.

[0040] When it is necessary to add hydrochloric acid to the wastewater for mixing, the wastewater is introduced into the mixing tank 2, and hydrochloric acid is added into the mixing tank 2 at the same time. The servo motor 17 is turned on, and under the support of the mixing tank 2, the servo motor 17 drives the rotating shaft 18 to rotate. The rotating shaft 18 drives the stirring blade 19 and the support frame 20 to rotate. The stirring blade 19 fully stirs the wastewater and hydrochloric acid inside the mixing tank 2. The support frame 20 drives the spring 21 and the scraper arm 22 to rotate. Under the elastic support of the spring 21, the spring 21 drives the scraper arm 22 to elastically scrape the inner wall of the mixing tank 2, which facilitates the full mixing of the mixture and improves the uniformity of the mixing of the mixture in the device for treating whitening agent wastewater.

[0041] The surface of the first end cover 13 is movably mounted with six sets of equally spaced rotating shafts 25. The surface of each rotating shaft 25 is fitted with a rotating wheel 26, and the surface of each rotating wheel 26 is fitted with a threaded rod 27. The exterior of the second end cover 14 is provided with an annular cover 29.

[0042] The outer side of the annular cover 29 is provided with six sets of wing nuts 28 at equal intervals. All the wing nuts 28 are threadedly connected to the threaded rod 27. U-shaped blocks 33 are provided on the outer wall of the annular cover 29 on one side of the threaded rod 27.

[0043] When it is necessary to replace the internal components of the RO membrane module 12, the multiple sets of wing nuts 28 are turned. Under the threaded connection between the threaded rod 27 and the wing nuts 28, the multiple sets of wing nuts 28 are disengaged from the multiple sets of threaded rods 27. The threaded rods 27 are rotated around the rotating shaft 25 to disengage from the U-shaped block 33. The second end cover 14 and the annular cover 29 are removed. The internal components of the RO membrane module 12 are disassembled and replaced through the first end cover 13. After the replacement is completed, the second end cover 14 and the annular cover 29 are brought into contact with the first end cover 13. The multiple sets of wing nuts 28 are turned to tighten the wing nuts 28 and the threaded rods 27. This facilitates the convenient disassembly and replacement of components and enables the device for treating whitening agent wastewater to easily open the RO membrane module, improving the convenience of opening the RO membrane module of the device for treating whitening agent wastewater.

[0044] The working principle of the technical solution provided by this utility model is as follows: When using a three-stage RO device to treat whitening agent wastewater, the wastewater is introduced into the mixing tank 2, reactants are added, and the reaction is carried out. After the pH is stabilized by external equipment, the valve on the side wall of the mixing tank 2 is opened, and the wastewater flows into the filter 3 through the water pipe 5 for filtration. The filtered wastewater is tested for pass rate by the inlet conductivity 4, and the pressure gauge 6 displays the pressure. When the required pressure is reached, the pressure switch 7 and the high-pressure pump 8 are turned on, and the wastewater is transported to the RO membrane module 12 for treatment through the pipeline valve component 9. After treatment, the wastewater passes through the first end cover 13, the second end cover 14, and the float flow meter 15. The float flow meter 15 detects the liquid flow rate of the wastewater in real time. The wastewater continues to flow through the bend pipe 16 to the surface of the freshwater and concentrated water detection device 23. The freshwater and concentrated water detection device 23 detects the wastewater. If it is freshwater, the stepper motor 30 drives the support shaft 31 to rotate, and the support shaft 31 drives the tilting plate 32 to rotate. One side of the diversion hood 24 closes off one channel, allowing fresh water to flow out and be collected through the open channel. For concentrated wastewater, the stepper motor 30 is reversed, allowing the concentrated wastewater to flow out and be collected through the other channel. When hydrochloric acid needs to be added to the wastewater for mixing, the servo motor 17 drives the rotating shaft 18 to rotate. The rotating shaft 18 drives the stirring blades 19 and the support frame 20 to rotate. The stirring blades 19 thoroughly stir the wastewater and hydrochloric acid inside the mixing tank 2, while the support frame 20 drives the spring 2... 1. The scraper arm 22 rotates, and the spring 21 drives the scraper arm 22 to elastically scrape the inner wall of the mixing tank 2. Tighten the multiple sets of wing nuts 28 so that the multiple sets of wing nuts 28 disengage from the multiple sets of threaded rods 27. Rotate the threaded rods 27 around the rotating shaft 25 so that the threaded rods 27 disengage from the inside of the U-shaped block 33. Remove the second end cover 14 and the annular cover 29. Through the first end cover 13, disassemble and replace the internal parts of the RO membrane assembly 12 to complete the use of the device for treating whitening agent wastewater.

[0045] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A three-stage RO treatment device for treating whitening agent wastewater, characterized in that: The device includes a support frame and a mixing tank. The mixing tank is mounted on the top of the support frame. A filter is mounted on the side of the top of the support frame away from the mixing tank. An inlet water conductivity meter is mounted on the side of the top of the support frame away from the filter. A pressure switch is mounted on the side of the top of the support frame away from the inlet water conductivity meter. A pressure gauge is mounted on the side wall of the pressure switch. A high-pressure pump is mounted on the side of the top of the support frame away from the pressure switch. An RO membrane module is mounted on the side wall of the support frame. Piping valve components are mounted on the side wall of the RO membrane module. A water pipe is mounted on the side wall of the mixing tank. The water pipe passes through the filter, inlet water conductivity meter, pressure gauge, pressure switch, and high-pressure pump, extending to the surface of the piping valve components and connecting thereto.

2. The apparatus for treating whitening agent wastewater using a three-stage RO system according to claim 1, characterized in that: An online instrumentation system is installed on the outer wall of the support frame. A control panel is installed on the side of the outer wall of the support frame near the online instrumentation system. A first end cap is installed on the end of the RO membrane module away from the pipeline valve components. A second end cap is provided outside the first end cap.

3. The apparatus for treating whitening agent wastewater using a three-stage RO system according to claim 2, characterized in that: A float flow meter is installed on the side wall of the second end cover. A bend is installed at the output end of the float flow meter. A freshwater and concentrated water detection device is installed at the bottom end of the bend. A flow divider is installed at the bottom end of the freshwater and concentrated water detection device. A stepper motor is installed on the surface of the flow divider. A support shaft is installed at the output end of the stepper motor. The support shaft extends through the flow divider to its outside. A flip plate is fitted on the surface of the support shaft inside the flow divider. The output end of the control panel is electrically connected to the input ends of the inlet conductivity meter, pressure gauge, pressure switch, high-pressure pump, online instrument system, float flow meter, servo motor, freshwater and concentrated water detection device, and stepper motor.

4. The apparatus for treating whitening agent wastewater using a three-stage RO system according to claim 3, characterized in that: A servo motor is installed at the top of the mixing tank, and a rotating shaft is installed at the output end of the servo motor.

5. The apparatus for treating whitening agent wastewater using a three-stage RO system according to claim 4, characterized in that: The rotating shaft extends into the interior of the mixing tank and is movably connected thereto, and the surface of the rotating shaft is fitted with stirring blades.

6. The apparatus for treating whitening agent wastewater using a three-stage RO system according to claim 5, characterized in that: A support frame is fitted onto the surface of the outer rotating shaft of the stirring blade, and two sets of scraper arms are provided on the outside of the support frame.

7. The apparatus for treating whitening agent wastewater using a three-stage RO system according to claim 6, characterized in that: Two sets of springs are symmetrically installed on the side wall of the support frame, and the side of each spring away from the support frame is connected to the scraper arm.

8. The apparatus for treating whitening agent wastewater using a three-stage RO system according to claim 7, characterized in that: The surface of the first end cap is movably mounted with six sets of equally spaced rotating shafts, and each rotating shaft is fitted with a rotating wheel.

9. The apparatus for treating whitening agent wastewater using a three-stage RO system according to claim 8, characterized in that: The surfaces of the rotating wheels are all fitted with threaded rods, and the outer surface of the second end cover is provided with an annular cover.

10. The apparatus for treating whitening agent wastewater using a three-stage RO system according to claim 9, characterized in that: The outer side of the annular cover is provided with six sets of wing nuts at equal intervals. All the wing nuts are threadedly connected to the threaded rod. A U-shaped block is provided on the outer wall of the annular cover on one side of the threaded rod.

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