Reverse osmosis sewage multi-stage purification device based on flat micro-filtration membrane pretreatment

Abstract

The invention provides a reverse osmosis sewage multi-stage purification device based on flat micro-filtration membrane pretreatment, and relates to the technical field of sewage purification treatment. A flat micro-filtration membrane treatment assembly and a reverse osmosis purification treatment assembly are mounted on the fixed frame, the left ends of the flat micro-filtration membrane treatment assembly and the reverse osmosis purification treatment assembly are connected with a communicating pipe, a raw water supply pump is mounted on the fixed frame, and the water inlet end of the raw water supply pump is communicated with a raw water inlet pipe; a raw water inlet control valve is mounted on the raw water inlet pipe; a flat micro-filtration membrane pretreatment and reverse osmosis purification coupling process is adopted, a flat micro-filtration membrane firstly intercepts suspended solids, colloids and other impurities in raw water, the load of a subsequent reverse osmosis system is relieved, the impurities are prevented from blocking or polluting a reverse osmosis assembly, the reverse osmosis system deeply removes soluble salts, organic matters, microorganisms and other pollutants in water, and the water quality is improved. And in cooperation with secondary filtration of a subsequent security filter, high-purity water is finally produced, and the diversified standard water use requirements are met.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification and treatment technology, and in particular to a multi-stage reverse osmosis wastewater purification device based on flat sheet microfiltration membrane pretreatment. Background Technology

[0002] In the field of advanced wastewater treatment, single treatment processes often struggle to balance pollutant removal efficiency, effluent quality stability, and treatment costs. Flat-sheet microfiltration membrane technology, with its high efficiency in removing suspended solids, colloids, and other solid impurities, is widely used in wastewater pretreatment, effectively reducing the pollution load on subsequent treatment units and creating favorable conditions for advanced purification. Reverse osmosis technology, with its ability to deeply remove dissolved salts and small-molecule organic pollutants, has become one of the core technologies for advanced wastewater treatment, purifying wastewater to meet high water quality standards. To further enhance the overall efficiency of wastewater purification and achieve complementary advantages among different treatment technologies, the coupled process of combining flat-sheet microfiltration membrane pretreatment with reverse osmosis advanced treatment has gradually become a hot topic in industry research and application. This invention is a multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment.

[0003] In the current field of wastewater treatment, existing combined processes are mostly simple technology superpositions that have not formed an efficient coupling and synergistic effect. The pretreatment is not efficient enough in retaining impurities and cannot effectively reduce the load on the subsequent deep treatment system. This results in high pollution pressure on the deep treatment components, making it difficult to stably remove pollutants such as dissolved salts, organic matter, and microorganisms and produce high-purity water. Summary of the Invention

[0004] This invention relates to a multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment, in order to solve the technical problems mentioned in the background art.

[0005] In a first aspect, the present invention provides a multi-stage reverse osmosis wastewater purification device based on flat-plate microfiltration membrane pretreatment, specifically comprising: a fixed frame; a flat-plate microfiltration membrane treatment component and a reverse osmosis purification treatment component are mounted on the fixed frame, the left ends of the flat-plate microfiltration membrane treatment component and the reverse osmosis purification treatment component are connected to a connecting pipe, a raw water supply pump is mounted on the fixed frame, the inlet end of the raw water supply pump is connected to a raw water inlet pipe, a raw water inlet control valve is mounted on the raw water inlet pipe, a connecting pipe connects the flat-plate microfiltration membrane treatment component and the outlet end of the raw water supply pump, a manual valve and a raw water inlet flow sensor are mounted on the connecting pipe, a product water outlet pipe is connected to the right end of the reverse osmosis purification treatment component, a product water pump is mounted on the fixed frame, the inlet end of the product water pump is connected to the product water outlet pipe, and a product water outlet flow sensor is mounted on the outlet end of the product water pump.

[0006] Furthermore, the flat-plate microfiltration membrane treatment component is connected to the left end of the raw water supply pump with a concentrated water outlet pipe, which is connected to the concentrated water inlet pipe, and the lower end of the concentrated water treatment tank is connected to a concentrated water discharge pipe.

[0007] Furthermore, a security filter is installed on the mounting frame, and a connecting pipe connects the security filter to the outlet of the water pump.

[0008] Furthermore, a pressure pump is installed on the fixed frame, and a water supply pipe is connected between the water inlet of the pressure pump and the security filter. An anti-backflow valve, a solenoid valve, and a water outlet control valve are installed on the water supply pipe.

[0009] Furthermore, the anti-reverse valve is internally equipped with a sealing plug and a spring.

[0010] Furthermore, the outlet of the booster pump is connected to a water discharge pipe, and a water discharge valve is installed on the water discharge pipe.

[0011] Furthermore, the flat-plate microfiltration membrane processing assembly is internally provided with a detachable microfiltration membrane filter element, and the two ends of the microfiltration membrane filter element are sealed to the inner wall of the flat-plate microfiltration membrane processing assembly through sealing rings.

[0012] Furthermore, a concentrated water treatment tank is installed on the fixed frame, a top cover is installed on the upper end of the concentrated water treatment tank, a motor base is installed on the top cover, a drive motor is installed on the motor base, a rotating rod is installed on the top cover via a bearing, the upper end of the rotating rod is connected to the output shaft of the drive motor via a coupling, a spiral plate is fixed on the rotating rod, and an upper mounting seat and a lower mounting seat are installed on the rotating rod. Three rotatable rotating seats are installed on the lower mounting seat, a connecting plate is fixed on the rotating seat, a turnbuckle is universally connected between the connecting plate and the upper mounting seat, and a connecting seat is installed on the rotating seat via a pin.

[0013] Furthermore, a rotatable first connecting shaft is installed on the connecting seat, and a through hole is provided on the first connecting shaft. A rotatable second connecting shaft is installed on the rotating seat, and an adjusting rod is threaded onto the second connecting shaft. The adjusting rod is connected to the through hole on the first connecting shaft through a locking ring. A stirring plate is installed on the connecting seat by bolts, and a waist-shaped groove is provided on the stirring plate.

[0014] Furthermore, the rotating rod is provided with a fixing groove, and both the upper and lower mounting seats are provided with a locking plate that cooperates with the fixing groove. A concentrated water inlet pipe is installed on the top cover, a concentrated water inlet control valve is installed on the concentrated water inlet pipe, a float valve is installed at the lower end of the concentrated water inlet control valve, and a treatment agent addition pipe is installed on the top cover.

[0015] This invention provides a multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment, which has the following beneficial effects: In this invention, a coupled process of flat-sheet microfiltration membrane pretreatment and reverse osmosis purification is adopted. The flat-sheet microfiltration membrane first intercepts suspended solids, colloids and other impurities in the raw water, reducing the load on the subsequent reverse osmosis system and preventing impurities from clogging or contaminating the reverse osmosis components. The reverse osmosis system then deeply removes dissolved salts, organic matter, microorganisms and other pollutants from the water. With the secondary filtration of the subsequent security filter, high-purity water is finally produced to meet diverse water quality standards.

[0016] Furthermore, in this invention, the concentrated water produced by the flat-plate microfiltration membrane treatment is introduced into a dedicated concentrated water treatment tank. The concentrated water and the treatment agent are fully mixed through the stirring structure inside the tank, which effectively reduces the pollutant content in the concentrated water and avoids the direct discharge of untreated concentrated water that would pollute the environment, thus meeting environmental protection requirements. The stirring structure of the concentrated water treatment tank has dual adjustment functions: rotating the turnbuckle can drive the rotating seat to adjust the overall position of the stirring plate to adapt to concentrated water of different liquid levels and eliminate stirring blind spots; rotating the adjusting rod can precisely adjust the tilt angle of the stirring plate to optimize the water flow disturbance intensity for the concentration difference of the concentrated water. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0018] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0019] In the attached diagram: Figure 1 A schematic diagram of the overall structure of a multi-stage reverse osmosis wastewater purification device based on flat-panel microfiltration membrane pretreatment according to the present invention is shown.

[0020] Figure 2 This invention illustrates a multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment. Figure 1 A magnified structural diagram of part A in the middle.

[0021] Figure 3 The diagram shows the overall right side of a multi-stage reverse osmosis wastewater purification device based on flat-panel microfiltration membrane pretreatment according to the present invention.

[0022] Figure 4 This invention illustrates a multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment. Figure 3 A magnified structural diagram of part B.

[0023] Figure 5 The diagram shows the overall left side of a multi-stage reverse osmosis wastewater purification device based on flat-panel microfiltration membrane pretreatment according to the present invention.

[0024] Figure 6This invention illustrates a multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment. Figure 5 A magnified structural diagram of section C.

[0025] Figure 7 A schematic diagram of the anti-backflow valve of a multi-stage reverse osmosis wastewater purification device based on flat-panel microfiltration membrane pretreatment according to the present invention is shown.

[0026] Figure 8 A schematic diagram of the overall rear structure of a multi-stage reverse osmosis wastewater purification device based on flat-panel microfiltration membrane pretreatment according to the present invention is shown.

[0027] Figure 9 This invention illustrates a multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment. Figure 8 A magnified structural diagram of part D in the middle.

[0028] Figure 10 A schematic diagram of the top cover portion of a multi-stage reverse osmosis wastewater purification device based on flat-panel microfiltration membrane pretreatment according to the present invention is shown.

[0029] Figure 11 A schematic diagram of the rotating rod of a multi-stage reverse osmosis wastewater purification device based on flat microfiltration membrane pretreatment according to the present invention is shown.

[0030] Figure 12 The diagram shows the upper and lower mounting bases of a multi-stage reverse osmosis wastewater purification device based on flat microfiltration membrane pretreatment according to the present invention.

[0031] Figure 13 A schematic diagram of the rotating seat portion of a multi-stage reverse osmosis wastewater purification device based on flat-plate microfiltration membrane pretreatment according to the present invention is shown.

[0032] List of reference numerals 1. Mounting frame; 11. Flat plate microfiltration membrane treatment assembly; 111. Connecting pipe; 112. Concentrate outlet pipe; 12. Reverse osmosis purification treatment assembly; 13. Raw water supply pump; 131. Raw water inlet pipe; 1311. Raw water inlet control valve; 132. Connecting pipe; 1321. Manual valve; 1322. Raw water inlet flow sensor; 14. Product water outlet pipe; 15. Product water pump; 151. Connecting pipe; 1511. Product water outlet flow sensor; 16. Security filter; 161. Water supply pipe; 162. Anti-backflow valve; 1621. Spring; 1622. Sealing plug; 163. Solenoid valve; 164. Outlet control valve; 17. Add 1. Pump; 171. Permeate discharge pipe; 172. Permeate discharge valve; 2. Concentrate treatment tank; 21. Top cover; 211. Concentrate inlet pipe; 212. Concentrate inlet control valve; 213. Float valve; 214. Treatment agent addition pipe; 22. Motor base; 221. Drive motor; 23. Rotating rod; 231. Spiral plate; 232. Fixing groove; 24. Upper mounting base; 241. Positioning plate; 25. Lower mounting base; 26. Rotating base; 261. Connecting plate; 262. Turnbuckle; 27. Connecting base; 271. First connecting shaft; 272. Second connecting shaft; 273. Adjusting rod; 274. Stirring plate; 28. Concentrate discharge pipe. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please refer to Figures 1 to 13 Example 1: This invention proposes a multi-stage reverse osmosis wastewater purification device based on flat-plate microfiltration membrane pretreatment, comprising: a fixed frame 1; a concentrate treatment tank 2 mounted on the fixed frame 1, a top cover 21 mounted on the upper end of the concentrate treatment tank 2, a motor base 22 mounted on the top cover 21, a drive motor 221 mounted on the motor base 22, a rotating rod 23 mounted on the top cover 21 via bearings, the upper end of the rotating rod 23 being connected to the output shaft of the drive motor 221 via a coupling, a spiral plate 231 fixed on the rotating rod 23, and an upper mounting base 24 and a lower mounting base 25 mounted on the rotating rod 23, with three rotatable rotating... A connecting plate 261 is fixed on a rotating seat 26. A turnbuckle 262 is universally connected between the connecting plate 261 and the upper mounting seat 24. A connecting seat 27 is mounted on the rotating seat 26 via a pin. A rotatable first connecting shaft 271 is mounted on the connecting seat 27. The first connecting shaft 271 has a through hole. A rotatable second connecting shaft 272 is mounted on the rotating seat 26. An adjusting rod 273 is threaded onto the second connecting shaft 272. The adjusting rod 273 is connected to the through hole on the first connecting shaft 271 via a locking ring. A stirring plate 274 is mounted on the connecting seat 27 via bolts. The stirring plate 274 has a waist-shaped groove.

[0035] In this embodiment of the invention, a fixing groove 232 is provided on the rotating rod 23, and a positioning plate 241 that cooperates with the fixing groove 232 is provided on both the upper mounting base 24 and the lower mounting base 25. A concentrated water inlet pipe 211 is installed on the top cover 21, and a concentrated water inlet control valve 212 is installed on the concentrated water inlet pipe 211. A float valve 213 is installed at the lower end of the concentrated water inlet control valve 212, and a treatment agent addition pipe 214 is installed on the top cover 21. Its function is that the float valve 213 at the lower end of the concentrated water inlet control valve 212 can automatically adjust the water inlet state according to the liquid level in the concentrated water treatment tank 2 to prevent the concentrated water in the tank from overflowing. The treatment agent addition pipe 214 on the top cover 21 allows the operator to accurately add the required treatment agent into the concentrated water treatment tank 2, creating conditions for the full mixing and reaction of the concentrated water and the treatment agent, and helping to improve the efficiency and effect of concentrated water treatment.

[0036] In this embodiment of the invention, a flat-plate microfiltration membrane treatment assembly 11 and a reverse osmosis purification treatment assembly 12 are mounted on a mounting frame 1. The flat-plate microfiltration membrane treatment assembly 11 has a removable microfiltration membrane filter element inside. Both ends of the microfiltration membrane filter element are sealed to the inner wall of the flat-plate microfiltration membrane treatment assembly 11 via sealing rings. A connecting pipe 111 connects the left ends of the flat-plate microfiltration membrane treatment assembly 11 and the reverse osmosis purification treatment assembly 12. A raw water supply pump 13 is mounted on the mounting frame 1. The inlet end of the raw water supply pump 13 is connected to a raw water inlet pipe 131. A raw water inlet control valve 1311 is mounted on the raw water inlet pipe 131. A connecting pipe 132 connects the flat-plate microfiltration membrane treatment assembly 11 and the outlet end of the raw water supply pump 13. A hand valve 1321 and a raw water inlet flow sensor 1322 are mounted on the connecting pipe 132. The reverse osmosis purification treatment assembly... The right end of 12 is connected to the water outlet pipe 14. A water pump 15 is installed on the fixed frame 1. The inlet end of the water pump 15 is connected to the water outlet pipe 14. A water flow sensor 1511 is installed at the outlet end of the water pump 15. The left end of the flat plate microfiltration membrane treatment component 11 is connected to the raw water supply pump 13 and the concentrate outlet pipe 112 is connected to the concentrate inlet pipe 211. The lower end of the concentrate treatment tank 2 is connected to the concentrate discharge pipe 28. Its function is: the removable microfiltration membrane filter element inside the flat plate microfiltration membrane treatment component 11 can perform preliminary filtration of the raw water, intercepting suspended solids, colloids and other impurities in the water. The two ends of the filter element are sealed to the inner wall of the component through sealing rings, which can prevent the mixing of unfiltered raw water and filtered water, ensuring the pretreatment effect. At the same time, the removable design facilitates the replacement and cleaning of the filter element later.

[0037] In Example 2, based on Example 1, a security filter 16 is installed on the mounting frame 1. A connecting pipe 151 connects the security filter 16 to the outlet of the product water pump 15. Its function is as follows: The security filter 16 installed on the mounting frame 1 serves as an important filtration and protection component in the product water transportation process. It can further refine the product water transported by the product water pump 15, effectively intercepting any small impurities, colloidal particles, or microorganisms that may remain in the product water. This prevents these impurities from entering the subsequent treatment process and causing blockages in the equipment or affecting the final output water quality, thereby further improving the purity of the product water.

[0038] In Example 3, based on Examples 1 and 2, a booster pump 17 is installed on the mounting frame 1. A water supply pipe 161 connects the inlet of the booster pump 17 to the security filter 16. An anti-backflow valve 162, a solenoid valve 163, and an outlet control valve 164 are installed on the water supply pipe 161. The anti-backflow valve 162 contains a sealing plug 1622 and a spring 1621. The outlet of the booster pump 17 is connected to a product water discharge pipe 171. A product water discharge valve 172 is installed on the product water discharge pipe 171. Its function is to ensure that the anti-backflow valve 162 installed on the water supply pipe 161, with its internal sealing plug 1622 and spring 1621,... The springs 1621 work together to effectively prevent backflow of produced water in the water supply pipe 161, avoiding backflow of water to impact the security filter 16 or the booster pump 17, preventing component damage and ensuring the stability of the water flow direction. The solenoid valve 163 can automatically control the flow of water in the water supply pipe 161, allowing operators to remotely or automatically adjust the water supply rhythm according to the overall operating status of the device, improving operational convenience. The outlet control valve 164 can manually adjust the water flow rate in the water supply pipe 161, providing flexible operating space for precise control of inlet pressure and flow rate, ensuring stable water intake for the booster pump 17.

[0039] The working principle of this invention: The raw water to be treated enters the device through the raw water inlet pipe 131. The raw water inlet control valve 1311 controls the flow of water. The raw water supply pump 13 provides power to transport the raw water through the connecting pipe 132 to the flat plate microfiltration membrane treatment component 11. The manual valve 1321 on the connecting pipe 132 can manually adjust the water inlet flow. The raw water inlet flow sensor 1322 monitors the water inlet flow in real time. The detachable microfiltration membrane filter element inside the flat plate microfiltration membrane treatment component 11 performs preliminary filtration on the raw water, intercepting impurities such as suspended solids and colloidal particles. After pretreatment, the raw water is produced. The initially purified water is transported to the reverse osmosis purification unit 12 through the connecting pipe 111. The reverse osmosis system utilizes the characteristics of a semi-permeable membrane to deeply remove dissolved salts, organic matter, microorganisms, and other contaminants to obtain permeable water. After being discharged through the permeable water outlet pipe 14, the permeable water is pumped by the permeable water pump 15. The permeable water outlet flow sensor 1511 monitors the permeable water output flow in real time. Subsequently, the permeable water enters the security filter 16 through the connecting pipe 151 for further fine filtration, intercepting residual minute impurities to protect downstream equipment and improve the purity of the permeable water. The filtered permeable water then flows through... The water flows through the feed pipe 161 to the booster pump 17. The anti-backflow valve 162 and solenoid valve 163 on the feed pipe 161 automatically control its on / off state. The outlet control valve 164 manually adjusts the flow rate. After the booster pump 17 provides sufficient pressure for the product water, the product water is delivered to a designated discharge point or storage device through the product water discharge pipe 171. The product water discharge valve 172 controls the start / stop and discharge volume. Simultaneously, the concentrate produced by the flat-plate microfiltration membrane treatment module 11 is discharged through the concentrate outlet pipe 112 and enters the concentrate treatment tank 2 through the concentrate inlet pipe 211. The concentrate inlet pipe 211... The concentrated water inlet control valve 212 regulates the inlet water volume, and the float valve 213 automatically controls the inlet water according to the liquid level in the tank. The operator adds the treatment agent through the treatment agent addition pipe 214. The drive motor 221 drives the rotating rod 23 to rotate. The spiral plate 231 on the rotating rod 23 and the stirring plate 274, whose angle and position can be adjusted by the turnbuckle 262 and the adjusting rod 273, fully mix the concentrated water and the treatment agent to improve the treatment effect. Finally, the treated concentrated water is discharged through the concentrated water discharge pipe 28 at the bottom of the concentrated water treatment tank 2, realizing efficient purification of sewage and discharge in compliance with standards.

[0040] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0041] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0042] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment, comprising: The fixture (1) is characterized in that a flat-plate microfiltration membrane treatment component (11) and a reverse osmosis purification treatment component (12) are installed on the fixture (1), and a connecting pipe (111) is connected to the left end of the flat-plate microfiltration membrane treatment component (11) and the reverse osmosis purification treatment component (12). A raw water supply pump (13) is installed on the fixture (1), and a raw water inlet pipe (131) is connected to the inlet end of the raw water supply pump (13). A raw water inlet control valve (1311) is installed on the raw water inlet pipe (131). A connecting pipe (132) is connected between the component (11) and the outlet of the raw water supply pump (13). A hand valve (1321) and a raw water inlet flow sensor (1322) are installed on the connecting pipe (132). A product water outlet pipe (14) is connected to the right end of the reverse osmosis purification treatment component (12). A product water pump (15) is installed on the fixed frame (1). The inlet of the product water pump (15) is connected to the product water outlet pipe (14). A product water outlet flow sensor (1511) is installed at the outlet of the product water pump (15).

2. The multi-stage reverse osmosis wastewater purification device based on flat-plate microfiltration membrane pretreatment according to claim 1, characterized in that, The flat plate microfiltration membrane treatment component (11) is connected to the left end of the raw water supply pump (13) via a concentrated water outlet pipe (112), which is connected to the concentrated water inlet pipe (211). The lower end of the concentrated water treatment tank (2) is connected to a concentrated water discharge pipe (28).

3. The multi-stage reverse osmosis wastewater purification device based on flat-plate microfiltration membrane pretreatment according to claim 1, characterized in that, A security filter (16) is installed on the fixed frame (1), and a connecting pipe (151) is connected between the security filter (16) and the outlet of the water pump (15).

4. The multi-stage reverse osmosis wastewater purification device based on flat-plate microfiltration membrane pretreatment according to claim 3, characterized in that, A booster pump (17) is installed on the fixed frame (1). A water supply pipe (161) is connected between the water inlet of the booster pump (17) and the security filter (16). An anti-backflow valve (162), a solenoid valve (163) and a water outlet control valve (164) are installed on the water supply pipe (161).

5. A multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment according to claim 4, characterized in that, The anti-reverse valve (162) is internally fitted with a sealing plug (1622) and a spring (1621).

6. The multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment according to claim 4, characterized in that, The outlet of the booster pump (17) is connected to a water discharge pipe (171), and a water discharge valve (172) is installed on the water discharge pipe (171).

7. A multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment according to claim 2, characterized in that, The flat microfiltration membrane processing assembly (11) is equipped with a detachable microfiltration membrane filter element inside. The two ends of the microfiltration membrane filter element are sealed to the inner wall of the flat microfiltration membrane processing assembly (11) through sealing rings.

8. A multi-stage reverse osmosis wastewater purification device based on flat-sheet microfiltration membrane pretreatment according to claim 4, characterized in that, The fixed frame (1) is equipped with a concentrated water treatment tank (2), and a top cover (21) is installed on the upper end of the concentrated water treatment tank (2). A motor base (22) is installed on the top cover (21), and a drive motor (221) is installed on the motor base (22). A rotating rod (23) is installed on the top cover (21) through a bearing. The upper end of the rotating rod (23) is connected to the output shaft of the drive motor (221) through a coupling. A spiral plate (231) is fixed on the rotating rod (23), and an upper mounting seat (24) and a lower mounting seat (25) are installed on the rotating rod (23). Three rotatable rotating seats (26) are installed on the lower mounting seat (25). A connecting plate (261) is fixed on the rotating seat (26), and a turnbuckle (262) is universally connected between the connecting plate (261) and the upper mounting seat (24). A connecting seat (27) is installed on the rotating seat (26) through a pin.

9. A multi-stage reverse osmosis wastewater purification device based on flat-plate microfiltration membrane pretreatment according to claim 8, characterized in that, The connecting seat (27) is equipped with a rotatable first connecting shaft (271), which has a through hole. The rotating seat (26) is equipped with a rotatable second connecting shaft (272), which has an adjusting rod (273) threaded onto the second connecting shaft (272). The adjusting rod (273) is connected to the through hole on the first connecting shaft (271) by a locking ring. The connecting seat (27) is equipped with a stirring plate (274) by bolts, which has a waist-shaped groove.

10. A multi-stage reverse osmosis wastewater purification device based on flat-plate microfiltration membrane pretreatment according to claim 9, characterized in that, The rotating rod (23) is provided with a fixing groove (232). The upper mounting base (24) and the lower mounting base (25) are both provided with a positioning plate (241) that cooperates with the fixing groove (232). The top cover (21) is provided with a concentrated water inlet pipe (211). The concentrated water inlet pipe (211) is provided with a concentrated water inlet control valve (212). The lower end of the concentrated water inlet control valve (212) is provided with a float valve (213). The top cover (21) is provided with a treatment agent addition pipe (214).

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