Textile wastewater safe discharge treatment device based on membrane separation

Abstract

The invention discloses a textile wastewater safe discharge treatment device based on membrane separation, which is applied to the field of sewage treatment, and is characterized in that a filtering process is set into three stages of pretreatment, main treatment and post-treatment, and the pretreatment is used for filtering impurities such as fiber scraps, dye particles and undissolved chemicals in wastewater; a plurality of membrane materials are adopted for main filtration and can be flexibly combined, fluctuating water quality components are detected in real time by utilizing a water quality sensor, so that a treatment path is dynamically configured and optimized, the adaptability of a membrane separation assembly is effectively improved, and compared with an existing immobilized filtration process, differentiated and precise treatment of wastewater can be realized; an online cleaning structure is arranged in the pretreatment stage, ultrasonic vibration and magnetic adsorption technologies are used for cleaning impurities, ultrasonic vibration can effectively prevent an impurity layer from being compacted on a filter screen, the filter screen is prevented from being blocked, the impurities can be rapidly discharged through magnetic adsorption, the solid-liquid separation speed is high, and the solid-liquid separation efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and in particular to a safe discharge treatment device for textile wastewater based on membrane separation. Background Technology

[0002] Membrane separation technology refers to the technology of selectively separating a mixture of molecules of different particle sizes at the molecular level when passing through a semipermeable membrane. Semipermeable membranes are also called separation membranes or filter membranes. The membrane wall is covered with small pores. According to the pore size, they can be divided into: microfiltration membranes (MF), ultrafiltration membranes (UF), nanofiltration membranes (NF), reverse osmosis membranes (RO), etc. Membrane separation uses cross-flow filtration or dead-end filtration methods.

[0003] Current membrane separation devices use multiple membrane separation modules to treat wastewater. Although this can meet the treatment requirements of large amounts of wastewater, the choice of membrane material is relatively limited. The combined membrane separation and recovery process for saline wastewater (publication number CN102774994B) and the multi-stage membrane separation device (publication number CN108939925A) both disclose schemes that use multiple membrane separation modules for combined treatment, effectively solving the drawbacks of using a single membrane material.

[0004] However, existing membrane separation devices are mostly integrated fixed processes or large-scale split equipment combinations. The large-scale split equipment occupies a lot of space and requires frequent membrane cleaning, and has a large processing capacity. On the other hand, the fixed process has poor adaptability. The composition of textile wastewater is fluctuating, and the fixed process filtration is relatively passive and cannot flexibly cope with the large fluctuations in the quality of textile wastewater, resulting in unstable treatment effect and easy damage to membrane modules. Once a section of membrane module is contaminated or damaged, it is necessary to shut down the machine and disassemble, clean or replace the entire pipeline, which takes a long time and affects production. Summary of the Invention

[0005] The core of this invention lies in solving the problem of poor adaptability of fixed processes in existing technologies by dynamically and flexibly adjusting the filtration process through real-time monitoring of textile wastewater quality. Simultaneously, online cleaning is performed during the pretreatment stage to prevent impurities such as fiber debris and dye particles in the wastewater from clogging the membrane modules.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A safe discharge treatment device for textile wastewater based on membrane separation includes a pretreatment module, a water quality sensing module, a main treatment module, and a post-treatment module. The pretreatment module includes a pretreatment membrane assembly, the water quality sensing module includes a water quality detection cylinder connected to the pretreatment membrane assembly and a water quality sensor installed inside the water quality detection cylinder, and the post-treatment module includes a catalytic oxidation membrane assembly. The main processing module includes multiple microfiltration membrane modules, nanofiltration membrane modules and reverse osmosis membrane modules placed side by side. The feed liquid inlet end of each microfiltration membrane module, nanofiltration membrane module and reverse osmosis membrane module is connected to a feed liquid branch pipe, and each feed liquid branch pipe is equipped with a solenoid valve. The multiple feed liquid branch pipes are connected to a feed liquid main pipe, and the water inlet end of the feed liquid main pipe is connected to a water quality detection cylinder. The concentrate outlets of the microfiltration membrane module, nanofiltration membrane module, and reverse osmosis membrane module are all connected to a concentrate discharge pipe. The permeate outlets of the microfiltration membrane module, nanofiltration membrane module, and reverse osmosis membrane module are all connected to permeate discharge pipes, and each permeate discharge pipe is connected to a permeate branch pipe. Multiple permeate branch pipes are connected to a permeate main pipe, and the end of the permeate main pipe is connected to the catalytic oxidation membrane module. Each permeate branch pipe is equipped with a second solenoid valve. Each permeate branch pipe is connected to its adjacent feed liquid branch pipe with a permeate connecting pipe, and both ends of the permeate connecting pipe are equipped with a third solenoid valve. The water quality sensor is connected to the first, second, and third solenoid valves via a microcontroller.

[0008] Furthermore, the pretreatment membrane assembly includes a housing and upper and lower shell heads. A filter element is fixedly connected between the upper and lower shell heads. A hollow rotating rod is placed in the middle of the filter element and is rotatably and sealed to the upper shell head. A drive motor connected to the water quality sensor signal is installed on the inner wall of the upper shell head, and a gear transmission component is connected between the output end of the drive motor and the upper side wall of the hollow rotating rod. An impurity discharge pipe communicating with the inside of the filter element is connected to the middle of the lower shell head.

[0009] Furthermore, the bottom of the lower shell head is funnel-shaped, and an electromagnetic layer is fixedly embedded on the surface of the funnel.

[0010] Furthermore, the filter element includes a solid cylinder fixedly connected to the shell head and a filter cartridge located in the middle, and the horizontal cross-section of the filter cartridge is a continuous annular curved shape.

[0011] Optionally, the filter cartridge includes a filter layer, and the inner wall of the filter layer is fixedly inlaid with multiple vertically and equally spaced elastic ribs.

[0012] Preferably, the upper end of the hollow rotating rod is rotatably sealed and connected to a feeding pipe that extends to the outside of the shell head, and the interior of the hollow rotating rod is provided with a flocculant feeding chamber and a magnetic particle feeding chamber. A bracket is fixedly connected to the side wall of the hollow rotating rod, and a cleaner that contacts the inner wall of the filter cartridge is fixedly connected to the end of the bracket away from the hollow rotating rod. The interiors of the feeding pipe, the hollow rotating rod, the bracket, and the cleaner are connected in sequence.

[0013] Preferably, the inner wall of the purifier has a mixing chamber, and a stirrer is installed inside the mixing chamber. The inner wall of the purifier has a mixing chamber that communicates with the support, and the mixing chamber stores magnetic flocculant. An ultrasonic vibrator connected to a water quality sensor signal is fixedly embedded in the side wall of the purifier facing the filter cartridge. Multiple symmetrically distributed grooves are formed on the side walls of the purifier on both sides of the ultrasonic vibrator, and a nozzle is installed inside each groove. A pressure pump connected to the nozzle is installed on the inner wall of the mixing chamber. The inner wall of the purifier also has two symmetrically distributed pre-storage chambers, which are connected to the flocculant feeding chamber and the magnetic particle feeding chamber, respectively. A solenoid valve connected to a water quality sensor signal is installed at the connection between one pre-storage chamber and the mixing chamber, and a quantitative powder dispenser connected to a water quality sensor signal is installed at the connection between the other pre-storage chamber and the mixing chamber.

[0014] Furthermore, the magnetic flocculant is composed of micron-sized magnetic particles mixed with flocculant, and the quantitative powder dispenser includes a through cylinder, a powder suction component that is sealed and slidably connected inside the through cylinder, and an electric telescopic rod that is fixedly connected to the inner wall of the pre-storage cavity and whose output end is connected to the powder suction component.

[0015] Furthermore, the powder suction component includes two sliding heads that are slidably and sealingly connected to the inner wall of the through cylinder, an elastic cylinder fixedly connected between the two sliding heads, and an electromagnetic layer fixedly connected to the inner wall of the elastic cylinder. One of the sliding heads has an air storage cavity on its inner wall, and an air pump is installed at the connection between the air storage cavity and the internal space of the elastic cylinder.

[0016] Compared with the prior art, the advantages of this invention are: (1) This solution sets the filtration process into three stages: pretreatment, main treatment and posttreatment. The pretreatment is used to filter impurities such as fiber debris, dye particles and undissolved chemicals in the wastewater. The main filtration uses a variety of membrane materials that can be flexibly combined. The water quality sensor is used to detect the fluctuating water quality components in real time, so as to dynamically configure and optimize the treatment path, effectively improving the adaptability of the membrane separation components. Compared with the existing fixed filtration process, it can achieve differentiated and precise treatment of wastewater.

[0017] (2) By setting up an online cleaning structure in the pretreatment stage, ultrasonic vibration and magnetic adsorption technology are used to clean impurities. Ultrasonic vibration can effectively prevent the impurity layer from being compacted on the filter screen and avoid filter screen blockage. Magnetic adsorption can quickly discharge impurities. The solid-liquid separation speed is fast and the efficiency is high. The formula ratio of magnetic flocculant can also be dynamically adjusted according to the water quality, thereby effectively improving the pretreatment effect. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a path diagram of the present invention when selecting a single filtering process; Figure 3 This is a path diagram of the present invention when selecting a combined filtration process; Figure 4 This is a front cross-sectional view of the pretreatment membrane assembly of the present invention; Figure 5 This is a top cross-sectional view of the pretreatment membrane assembly of the present invention; Figure 6 for Figure 5 Structural diagram at point A; Figure 7 This is a top view of the filter cartridge of the present invention; Figure 8 for Figure 7 Structural diagram at point B; Figure 9 This is a dynamic diagram of the quantitative powder feeder of the present invention during the feeding process; Figure 10 This is a front cross-sectional view of the powder suction component of the present invention.

[0019] Explanation of the labels in the diagram: 1. Microfiltration membrane module, 2. Nanofiltration membrane module, 3. Reverse osmosis membrane module, 4. Feed solution branch pipe, 5. Feed solution main pipe, 6. Solenoid valve one, 7. Water quality testing cylinder, 8. Pretreatment membrane module, 801 shell, 802 shell head, 9. Concentrate discharge pipe, 10. Permeate discharge pipe, 11. Permeate branch pipe, 12. Permeate main pipe, 13. Catalytic oxidation membrane module, 14. Solenoid valve two, 15. Permeate connection pipe, 16. Solenoid valve three, 17. Filter element, 1701 solid cylinder, 1702 filter cartridge, 17021 filter layer, 17022 elastic support, 18. Hollow rotating rod, 180 1. Flocculant feeding chamber, 1802. Magnetic particle feeding chamber, 19. Feeding pipe, 20. Drive motor, 21. Gear transmission component, 22. Impurity discharge pipe, 23. Support, 24. Cleaner, 2401. Mixing chamber, 2402. Groove, 2403. Pre-storage chamber, 25. Nozzle, 26. Pressure pump, 27. Ultrasonic vibrator, 28. Electromagnetic layer, 29. Stirrer, 30. Solenoid valve, 31. Quantitative powder feeder, 3101. Through cylinder, 3102. Powder suction component, 3103. Electric telescopic rod, 32. Sliding head, 33. Elastic cylinder, 34. Electromagnetic layer, 35. Air storage chamber, 36. Air pump. Detailed Implementation

[0020] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0021] First implementation method: Please see Figure 1A safe discharge treatment device for textile wastewater based on membrane separation includes a pretreatment module, a water quality sensing module, a main treatment module, and a post-treatment module. The pretreatment module includes a pretreatment membrane assembly 8. The water quality sensing module includes a water quality detection cylinder 7 connected to the pretreatment membrane assembly 8 and a water quality sensor (the specific model is selected according to actual needs) installed inside the water quality detection cylinder 7. The post-treatment module includes a catalytic oxidation membrane assembly 13. Please see Figure 1 The main processing module includes multiple microfiltration membrane modules 1, nanofiltration membrane modules 2 and reverse osmosis membrane modules 3 placed side by side. The feed liquid inlet end of each of the microfiltration membrane module 1, nanofiltration membrane module 2 and reverse osmosis membrane module 3 is connected to a feed liquid branch pipe 4, and each feed liquid branch pipe 4 is equipped with a solenoid valve 6 (the specific model is selected according to actual needs). The multiple feed liquid branch pipes 4 are connected to a feed liquid main pipe 5, and the water inlet end of the feed liquid main pipe 5 is connected to the water quality detection cylinder 7. Please see Figure 1 The concentrate outlets of the microfiltration membrane module 1, nanofiltration membrane module 2, and reverse osmosis membrane module 3 are all connected to a concentrate discharge pipe 9. The permeate outlets of the microfiltration membrane module 1, nanofiltration membrane module 2, and reverse osmosis membrane module 3 are all connected to permeate discharge pipes 10, and each permeate discharge pipe 10 is connected to a permeate branch pipe 11. Multiple permeate branch pipes 11 are connected to a permeate main pipe 12, and the end of the permeate main pipe 12 is connected to the catalytic oxidation membrane module 13. Each permeate branch pipe 11 is equipped with a second solenoid valve 14 (the specific model is selected according to actual needs). Each permeate branch pipe 11 is connected to its adjacent raw liquid branch pipe 4 via a permeate connecting pipe 15, and both ends of the permeate connecting pipe 15 are equipped with a third solenoid valve 16 (the specific model is selected according to actual needs). The water quality sensor is connected to the first solenoid valve 6, the second solenoid valve 14, and the third solenoid valve 16 via a microcontroller. Please see Figure 2 In treating textile wastewater, the wastewater first enters the pretreatment membrane module 8, where it traps solid impurities such as fiber scraps, dye particles, and undissolved chemicals. The pretreated wastewater then enters the water quality detection tank 7, where a water quality sensor monitors the water quality in real time. Based on the monitoring results, the system adaptively selects the optimal filtration path. For example, if the detected water contains a large number of suspended particles, such as... Figure 2 As shown in diagram a, the wastewater enters the microfiltration membrane module 1 through the raw liquid branch pipe 4 for filtration. The filtered concentrate is discharged through the concentrate discharge pipe 9. The permeate is transported to the catalytic oxidation membrane module 13 through the permeate branch pipe 11 and the permeate main pipe 12. The catalytic oxidation membrane module 13 then undergoes further filtration before being discharged. If the tested water quality is high-color, low-salinity wastewater, such as... Figure 2 As shown in b, the wastewater enters nanofiltration membrane module 2 for filtration. If the detected water quality is high-salinity wastewater, such as Figure 2 As shown in c, the wastewater enters the reverse osmosis membrane module 3 for filtration. Please see Figure 3 When the wastewater composition is detected to be complex, any combination of microfiltration membrane module 1, nanofiltration membrane module 2, and reverse osmosis membrane module 3 can be selected to filter the wastewater, such as... Figure 3 As shown by d in the diagram, this represents the filtration path of the combined microfiltration membrane module 1 and nanofiltration membrane module 2. Figure 3 As shown in 'e', ​​this represents the filtration path of the combined nanofiltration membrane module 2 and reverse osmosis membrane module 3, as follows: Figure 3 As shown in f, the path of the combined filtration of microfiltration membrane module 1, nanofiltration membrane module 2 and reverse osmosis membrane module 3 is shown. The wastewater flow path is controlled by the opening or closing of solenoid valve 1 6, solenoid valve 2 14 and solenoid valve 3 16. Additionally, it should be noted that the wastewater filtration path is determined by the detection results of the water quality sensor, and the detection threshold for determining the wastewater filtration path needs to be set according to actual production needs, and is not specifically limited here. Furthermore, the specific membrane materials for microfiltration membrane module 1, nanofiltration membrane module 2, and reverse osmosis membrane module 3 can also be freely selected according to actual needs, and are not limited to these three membrane materials. This embodiment sets the filtration process into three stages: pretreatment, main treatment, and posttreatment. The pretreatment is used to filter impurities such as fiber debris, dye particles, and undissolved chemicals from the wastewater. The main filtration uses a variety of membrane materials that can be flexibly combined. Water quality sensors are used to detect fluctuating water quality components in real time, thereby dynamically configuring and optimizing the treatment path, effectively improving the adaptability of the membrane separation components. Compared with the existing fixed filtration process, it can achieve differentiated and precise treatment of wastewater.

[0022] Second implementation method: In the first embodiment, the pretreatment membrane module 8 plays the role of pretreatment of wastewater, mainly by intercepting solid impurities such as fiber scraps, dye particles, and undissolved chemicals in the wastewater. However, after long-term operation, solid impurities will cause clogging of the filter element 17. Therefore, this embodiment adds an online cleaning device to the first embodiment to clean solid impurities, while the rest remains the same as the first embodiment. Please see Figure 4The pretreatment membrane assembly 8 includes a housing 801 and upper and lower housing heads 802. A filter element 17 is fixedly connected between the upper and lower housing heads 802. A hollow rotating rod 18 is placed in the middle of the filter element 17 and is sealed and rotatably connected to the upper housing head 802. A drive motor 20 (the specific model is selected according to actual needs) is installed on the inner wall of the upper housing head 802 and is connected to the water quality sensor signal. A gear transmission component 21 (an existing structure, not described in detail here) is connected between the output end of the drive motor 20 and the upper side wall of the hollow rotating rod 18. An impurity discharge pipe 22, which communicates with the inside of the filter element 17, is connected in the middle of the lower housing head 802. During pretreatment, textile wastewater enters the inside of the filter element 17. The filter element 17 intercepts solid impurities such as fiber scraps, dye particles, and undissolved chemicals in the wastewater. The filtered wastewater is discharged into the water quality detection cylinder 7, and the intercepted solid impurities are discharged out through the impurity discharge pipe 22. Please see Figure 4 , Figure 5 , Figure 7 and Figure 8 The filter element 17 includes a solid cylinder 1701 fixedly connected to the shell head 802 and a filter cylinder 1702 located in the middle. The horizontal cross-section of the filter cylinder 1702 is a continuous curved shape in the ring. The filter cylinder 1702 includes a filter layer 17021, and multiple vertically and equally spaced elastic ribs 17022 (preferably made of polyurethane elastic material, but other elastic materials can be selected according to actual needs) are fixedly embedded in the inner wall of the filter layer 17021. The filter cylinder 1702 plays a filtering role. In order to prevent the solid impurity layer from being compacted on the filter cylinder 1702 and to facilitate the shedding of the impurity layer, the filter cylinder 1702 is set to a continuous curved shape. The filter layer 17021 is an impurity interception screen and plays a filtering role. The elastic ribs 17022 are embedded inside the filter layer 17021 to provide it with the function of restoring elasticity and shaping. Please see Figure 4 The upper end of the hollow rotating rod 18 is sealed and rotatably connected to a feeding pipe 19 that extends through to the outside of the shell head 802. The hollow rotating rod 18 is provided with a flocculant feeding chamber 1801 and a magnetic particle feeding chamber 1802. A bracket 23 is fixedly connected to the side wall of the hollow rotating rod 18. A cleaner 24 that contacts the inner wall of the filter cartridge 1702 is fixedly connected to the end of the bracket 23 away from the hollow rotating rod 18. The feeding pipe 19, the hollow rotating rod 18, the bracket 23 and the cleaner 24 are connected in sequence. Magnetic flocculant is added to the inside of the cleaner 24 through the feeding pipe 19. Please see Figure 5 , Figure 6The inner wall of the cleaner 24 has a mixing chamber 2401, and a stirrer 29 (the specific model is selected according to actual needs) is installed inside the mixing chamber 2401. The inner wall of the cleaner 24 has a mixing chamber 2401 that communicates with the support 23, and the mixing chamber 2401 stores magnetic flocculant. An ultrasonic vibrator 27 connected to the water quality sensor signal is fixedly embedded on the side wall of the cleaner 24 facing the filter cartridge 1702. The specific model is selected according to actual needs. Multiple symmetrically distributed grooves 2402 are formed on the side walls of the cleaner 24 on both sides of the ultrasonic vibrator 27, and a nozzle 25 is installed inside each groove 2402. A pressure pump 26 connected to the nozzle 25 is installed on the inner wall of the mixing chamber 2401. The specific model is selected according to actual needs. The bottom of the shell head 802 at the lower end is funnel-shaped, and an electromagnetic layer 28 made of electromagnetic material is fixedly embedded on the surface of the funnel. Online cleaning During this process, the drive motor 20 drives the hollow rotating rod 18 to rotate slowly through the gear transmission component 21. The hollow rotating rod 18 drives the solidifier 24 to rotate. During the rotation, the solidifier 24 intermittently contacts the concave section of the filter cartridge 1702, and the ultrasonic vibrator 27 is activated to generate ultrasonic waves. The high-frequency vibration of the ultrasonic waves shakes off the impurity layer attached to the filter cartridge 1702. At the same time, the vibration can also effectively prevent the impurity layer from being compacted on the filter cartridge 1702. During the rotation of the solidifier 24, the pressure pump 26 sprays the stored magnetic flocculant into the filter cartridge 1702 through the nozzle 25. The magnetic flocculant combines with the shaken-off impurities and impurities in the wastewater to form denser, stronger, and magnetic flocs, thereby increasing the settling speed. Then, the electromagnetic layer 28 is activated to magnetically attract the magnetic flocs, which are finally discharged through the impurity discharge pipe 22. Compared with the existing scraping and cleaning method, this method can effectively improve the solid-liquid separation efficiency. In addition, the discharged magnetic flocs are separated from the magnetic material using demagnetization and sieving equipment, and then washed and reused in the front-end process to achieve recycling. Please see Figure 6The inner wall of the solidifier 24 also has two symmetrically distributed pre-storage chambers 2403, which are respectively connected to the flocculant feeding chamber 1801 and the magnetic particle feeding chamber 1802. A solenoid valve 30 (specific model selected according to actual needs) connected to a water quality sensor signal is installed at the connection between one pre-storage chamber 2403 and the mixing chamber 2401. A quantitative powder dispenser 31 connected to a water quality sensor signal is installed at the connection between the other pre-storage chamber 2403 and the mixing chamber 2401. When adding magnetic flocculant, it is added through the feeding pipe 19. The particles and flocculants enter the two pre-storage chambers 2403 through the flocculant feeding chamber 1801 and the magnetic particle feeding chamber 1802, respectively. According to the detection results of the water quality sensor, the solenoid valve 30 and the quantitative powder dispenser 31 control the dosage of magnetic particles and flocculants, respectively, so as to dynamically adjust the formula ratio of magnetic flocculants according to the water quality. Then, the magnetic particles and flocculants are mixed by the agitator 29 in 2401 before being released. In addition, it should be noted that the specific formula ratio of magnetic particles and flocculants is set according to the actual production needs and is not specifically limited here. Please see Figure 9 The magnetic flocculant is composed of micron-sized magnetic particles mixed with flocculant. The quantitative powder dispenser 31 includes a through cylinder 3101, a powder suction component 3102 sealed and slidably connected inside the through cylinder 3101, and an electric telescopic rod 3103 (specific model selected according to actual needs) fixedly connected to the inner wall of the pre-storage chamber 2403 and whose output end is connected to the powder suction component 3102. The flocculant forms larger and denser flocs through electrostatic attraction and bridging. After being mixed with magnetic particles, the formed magnetic flocs are dense and firmly bonded, which can efficiently remove impurities and reduce water volume. It has a strong ability to adapt to sudden changes in water quality. Compared with the drawback of existing sedimentation methods that rely on gravity, it can improve the sedimentation speed of flocs through magnetic attraction. In addition, the formula ratio of magnetic flocculant can be dynamically adjusted according to the detection results of water quality sensor. The solenoid valve 30 controls the amount of flocculant added by controlling the opening and closing time. The quantitative powder dispenser 31 uses the extension and retraction of electric telescopic rod 3103 to accommodate magnetic particles in conjunction with the concave deformation of powder suction part 3102. Then, the electric telescopic rod 3103 is pushed outward and the powder suction part 3102 is restored to its original deformation to add magnetic particles. Please see Figure 9 , Figure 10The powder-absorbing component 3102 includes two sliding heads 32 that are slidably and sealingly connected to the inner wall of the through cylinder 3101, an elastic cylinder 33 fixedly connected between the two sliding heads 32, and an electromagnetic layer 34 fixedly connected to the inner wall of the elastic cylinder 33. One of the sliding heads 32 has an air storage cavity 35 on its inner wall, and an air pump 36 (specific model selected according to actual needs) is installed at the connection between the air storage cavity 35 and the internal space of the elastic cylinder 33. When magnetic particles are added, the electric telescopic rod 3103 first moves the powder-absorbing component 3102 into the pre-storage cavity 2403. At this time, the air pump 36 is activated to adsorb the gas inside the elastic cylinder 33 into the air storage cavity 35. Under the action of negative pressure, the elastic cylinder 33 is concave inward. The magnetic particles are then attracted to the recessed area by energizing the electromagnetic layer 34. Next, the electric telescopic rod 3103 is activated to push the powder-absorbing component 3102 outward. When the powder-absorbing component 3102 is inside 2401, the gas is discharged into the space inside the elastic cylinder 33 by the air pump 36. Then, the electromagnetic layer 34 is de-energized. At this time, the elastic cylinder 33 returns to its original shape and releases the attracted magnetic particles into 2401 to mix with the flocculant. This completes one quantitative release. In addition, during the movement of the powder-absorbing component 3102, it is necessary to ensure that at least one sliding head 32 is inside the through cylinder 3101 to maintain a seal and ensure that the mixed magnetic flocculant does not penetrate in. This embodiment sets up an online cleaning structure in the pretreatment stage, and uses ultrasonic vibration and magnetic adsorption technology to clean impurities. Ultrasonic vibration can effectively prevent the impurity layer from being compacted on the filter screen and avoid filter screen blockage. Magnetic adsorption can quickly discharge impurities, resulting in fast solid-liquid separation speed and high efficiency.

[0023] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A membrane separation-based safe discharge treatment device for textile wastewater, comprising a pretreatment module, a water quality sensing module, a main treatment module, and a post-treatment module, characterized in that: The pretreatment module includes a pretreatment membrane assembly (8), the water quality sensing module includes a water quality detection cylinder (7) connected to the pretreatment membrane assembly (8) and a water quality sensor installed inside the water quality detection cylinder (7), and the posttreatment module includes a catalytic oxidation membrane assembly (13). The main processing module includes multiple microfiltration membrane modules (1), nanofiltration membrane modules (2) and reverse osmosis membrane modules (3) placed side by side. The feed liquid inlet of each of the microfiltration membrane modules (1), nanofiltration membrane modules (2) and reverse osmosis membrane modules (3) is connected to a feed liquid branch pipe (4), and each feed liquid branch pipe (4) is equipped with a solenoid valve (6). The multiple feed liquid branch pipes (4) are connected to a feed liquid main pipe (5), and the water inlet of the feed liquid main pipe (5) is connected to a water quality detection cylinder (7). The concentrate outlets of the microfiltration membrane module (1), nanofiltration membrane module (2), and reverse osmosis membrane module (3) are all connected to a concentrate discharge pipe (9). The permeate outlets of the microfiltration membrane module (1), nanofiltration membrane module (2), and reverse osmosis membrane module (3) are all connected to permeate discharge pipes (10), and each permeate discharge pipe (10) is connected to a permeate branch pipe (11). Multiple permeate branch pipes (11) are connected to a permeate main pipe (12), and the permeate... The end of the main pipe (12) is connected to the catalytic oxidation membrane assembly (13). Each of the permeate branch pipes (11) is equipped with a second solenoid valve (14). Each of the permeate branch pipes (11) is connected to its adjacent raw liquid branch pipe (4) by a permeate connecting pipe (15). Both ends of the permeate connecting pipe (15) are equipped with a third solenoid valve (16). The water quality sensor is connected to the first solenoid valve (6), the second solenoid valve (14), and the third solenoid valve (16) via a microcontroller.

2. The textile wastewater safe discharge treatment device based on membrane separation according to claim 1, characterized in that: The pretreatment membrane assembly (8) includes a housing (801) and upper and lower shell heads (802). A filter element (17) is fixedly connected between the upper and lower shell heads (802). A hollow rotating rod (18) is placed in the middle of the filter element (17) and is rotatably and sealed to the upper shell head (802). A drive motor (20) connected to the water quality sensor signal is installed on the inner wall of the upper shell head (802). A gear transmission component (21) is connected between the output end of the drive motor (20) and the upper side wall of the hollow rotating rod (18). An impurity discharge pipe (22) communicating with the inside of the filter element (17) is connected in the middle of the lower shell head (802).

3. The textile wastewater safe discharge treatment device based on membrane separation according to claim 2, characterized in that: The bottom of the lower shell head (802) is funnel-shaped, and an electromagnetic layer (28) is fixedly embedded on the surface of the funnel.

4. The textile wastewater safe discharge treatment device based on membrane separation according to claim 2, characterized in that: The filter element (17) includes a solid cylinder (1701) fixedly connected to the shell head (802) and a filter cylinder (1702) located in the middle, and the horizontal cross-section of the filter cylinder (1702) is a continuous curved shape of an annular shape.

5. The textile wastewater safe discharge treatment device based on membrane separation according to claim 4, characterized in that: The filter cartridge (1702) includes a filter layer (17021), and the inner wall of the filter layer (17021) is fixedly inlaid with a plurality of vertically and equally spaced elastic ribs (17022).

6. The textile wastewater safe discharge treatment device based on membrane separation according to claim 4, characterized in that: The upper end of the hollow rotating rod (18) is sealed and rotatably connected to a feeding pipe (19) that extends through to the outside of the shell head (802). The hollow rotating rod (18) is provided with a flocculant feeding chamber (1801) and a magnetic particle feeding chamber (1802). A bracket (23) is fixedly connected to the side wall of the hollow rotating rod (18). A cleaner (24) that contacts the inner wall of the filter cartridge (1702) is fixedly connected to the end of the bracket (23) away from the hollow rotating rod (18). The feeding pipe (19), the hollow rotating rod (18), the bracket (23) and the cleaner (24) are connected in sequence.

7. The textile wastewater safe discharge treatment device based on membrane separation according to claim 6, characterized in that: The inner wall of the purifier (24) is provided with a mixing chamber (2401), and a stirrer (29) is installed inside the mixing chamber (2401). An ultrasonic vibrator (27) connected to the water quality sensor signal is fixedly embedded on the side wall of the purifier (24) facing the filter cartridge (1702). Multiple symmetrically distributed grooves (2402) are provided on the side walls of the purifier (24) on both sides of the ultrasonic vibrator (27), and a nozzle (25) is installed inside each groove (2402). The inner wall of the mixing chamber (2401) is equipped with a nozzle (25). The pressure pump (26) is connected, and the inner wall of the solidifier (24) is also provided with two symmetrically distributed pre-storage chambers (2403). The two pre-storage chambers (2403) are respectively connected to the flocculant feeding chamber (1801) and the magnetic particle feeding chamber (1802). One of the pre-storage chambers (2403) is connected to the mixing chamber (2401) with a solenoid valve (30) connected to the water quality sensor signal. The other pre-storage chamber (2403) is connected to the mixing chamber (2401) with a quantitative powder dispenser (31) connected to the water quality sensor signal.

8. The textile wastewater safe discharge treatment device based on membrane separation according to claim 7, characterized in that: The magnetic flocculant is composed of micron-sized magnetic particles and flocculant. The quantitative powder dispenser (31) includes a through cylinder (3101), a powder suction component (3102) that is sealed and slidably connected inside the through cylinder (3101), and an electric telescopic rod (3103) that is fixedly connected to the inner wall of the pre-storage cavity (2403) and whose output end is connected to the powder suction component (3102).

9. The textile wastewater safe discharge treatment device based on membrane separation according to claim 8, characterized in that: The powder suction component (3102) includes two sliders (32) that are slidably and sealed to the inner wall of the through cylinder (3101), an elastic cylinder (33) fixedly connected between the two sliders (32), and an electromagnetic layer (34) fixedly connected to the inner wall of the elastic cylinder (33). One of the sliders (32) has an air storage cavity (35) on its inner wall, and an air pump (36) is installed at the connection between the air storage cavity (35) and the internal space of the elastic cylinder (33).

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