Method, system and apparatus for controlling wastewater purification based on reverse osmosis membranes

Abstract

This invention relates to the field of water treatment technology, specifically to a wastewater purification control method, system, and equipment based on reverse osmosis membranes. The wastewater purification equipment based on reverse osmosis membranes includes a filtration assembly and a control assembly. The filtration assembly includes a pressure outer cylinder, a purification cylinder, and a filter membrane unit. The gap between the pressure outer cylinder and the purification cylinder is divided into multiple independent filter membrane regions, each containing one filter membrane unit. The control assembly enables raw water to flow between the multiple filter membrane regions in a preset sequence, thereby balancing the usage frequency of each filter membrane region, preventing accelerated clogging of a single filter membrane region due to long-term exposure to high concentrations of scale-forming ions, ensuring the long-term stable operation of the filter membrane unit, and extending its service life.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to wastewater purification control methods, systems and equipment based on reverse osmosis membranes. Background Technology

[0002] Reverse osmosis membranes are polymeric materials with selective separation capabilities, used to remove impurities from water for deep purification. They are widely used in drinking water production, industrial wastewater treatment, seawater desalination, and the production of electronic-grade ultrapure water. They can also be used in food and beverage concentration and pharmaceutical purification. In operation, raw water undergoes pretreatment to remove suspended solids, colloids, and other impurities. Then, driven by a pressure of 1-10 MPa, it flows through the reverse osmosis membrane module. Water molecules in the raw water pass through the nanoscale micropores on the dense active layer of the membrane module, while impurities such as salts, colloids, and organic matter are retained by the dense active layer. The retained impurities are discharged with the concentrate, and the permeated water is the product water. During operation, a cleaning solution must be periodically introduced for cleaning. The reverse osmosis membrane module must be replaced when it fails to maintain its separation efficiency.

[0003] However, at the end of the raw water flow path, the aqueous phase concentration reaches its highest value within the system. Scale-forming ions such as calcium, magnesium, silicon, barium, and strontium accumulate, easily exceeding their solubility thresholds. They precipitate as hard crystals like calcium carbonate, calcium sulfate, and silica scale, causing blockage at the end of the reverse osmosis membrane module. This narrows the flow channels of the reverse osmosis membrane module, increases system operating pressure, and reduces water production efficiency. Furthermore, scale buildup damages the surface active layer of the reverse osmosis membrane, shortening its lifespan and increasing replacement costs. Summary of the Invention

[0004] Therefore, it is necessary to provide wastewater purification equipment based on reverse osmosis membranes to address the problem of easy clogging at the end of the reverse osmosis membrane module during operation.

[0005] The above objectives are achieved through the following technical solutions:

[0006] Wastewater purification equipment based on reverse osmosis membranes includes:

[0007] A water filtration assembly includes a pressure outer cylinder, a water purification cylinder, a partition structure, and a filter membrane unit; the water purification cylinder is coaxially disposed inside the pressure outer cylinder; the partition structure is used to divide the gap between the water purification cylinder and the pressure outer cylinder into multiple filter membrane regions; multiple filter membrane units are provided, and each filter membrane unit is located in one of the filter membrane regions.

[0008] A control component for controlling the flow sequence of raw water among the plurality of filter membrane regions.

[0009] Furthermore, the partition structure includes multiple partition plates, which are evenly distributed along the circumference of the water purification cylinder. One side wall of each partition plate is connected to the outer wall of the water purification cylinder, and the other side wall is connected to the inner wall of the pressure outer cylinder.

[0010] Furthermore, each of the filter membrane units can form multiple independent flow channels; when cleaning fluid is introduced into each of the filter membrane regions, the control component can control the cleaning fluid to enter any one of the flow channels in any one of the filter membrane regions; the control component can also control the cleaning fluid to sequentially enter one of the flow channels in multiple filter membrane regions.

[0011] Furthermore, the plurality of flow channels in each of the filter membrane regions are distributed radially along the water purification cylinder.

[0012] Furthermore, the filter membrane unit includes a separator, a separation membrane, and an inlet grid. The separator is bent multiple times to form a tightly layered distribution along the radial direction of the water purification cylinder. The separation membrane covers the inner wall of the separator, and multiple flow channels are located in the middle of the separation membrane. Multiple inlet grids are provided, and the multiple inlet grids are spaced apart at the radial center of each layer of the separation membrane. Each inlet grid is located within one flow channel, and an isolation element is provided between two adjacent inlet grids to restrict raw water from entering the adjacent flow channels.

[0013] Furthermore, the control component includes a diversion pipe, a concentrate pipe, and a first solenoid valve. The diversion pipe and the concentrate pipe each have multiple branches, and each branch is fixedly connected to a filter membrane region, and each branch can be connected to a flow channel. The first solenoid valve is fixedly disposed on the branches of the diversion pipe and the concentrate pipe, and is used to control the raw water or cleaning solution to enter the preset flow channel.

[0014] Furthermore, the control component also includes a plurality of second solenoid valves, each of which is fixedly installed between the two ends of two corresponding flow channels in two adjacent filter membrane regions, for realizing the connection or blockage of the flow channels between adjacent filter membrane regions.

[0015] Furthermore, each of the flow channels is fixedly provided with an inlet block and an outlet block at both ends, and the inlet block and the outlet block are used to isolate the two ends of the multiple flow channels.

[0016] The present invention also provides a wastewater purification system based on reverse osmosis membrane, including the wastewater purification device based on reverse osmosis membrane as described in any one of the above, and further including pressure detectors, wherein two pressure detectors are provided, and the two pressure detectors are used to detect the pressure value of the raw water at both ends of the flow path, so as to adjust the flow sequence of the raw water among the multiple filter membrane areas according to the pressure difference.

[0017] This invention also provides a wastewater purification control method based on a reverse osmosis membrane, applicable to any of the above-described wastewater purification devices based on reverse osmosis membranes, comprising the following steps:

[0018] S100. In normal operating mode, the control component controls the raw water to enter multiple filter membrane areas and alternates the flow order of the raw water among the multiple filter membrane areas so that the multiple filter membrane areas have a uniform degree of clogging.

[0019] S200. In cleaning mode, the cleaning fluid is controlled to flow in the filter membrane area by the control component.

[0020] S300: Monitor the working status through the control component and switch between normal working mode and cleaning mode.

[0021] The beneficial effects of this invention are:

[0022] This invention provides a wastewater purification control method, system, and equipment based on reverse osmosis membranes. The wastewater purification equipment based on reverse osmosis membranes includes a filtration assembly and a control assembly. The filtration assembly includes a pressure outer cylinder, a purification cylinder, a partition structure, and filter membrane units. The purification cylinder is coaxially arranged inside the pressure outer cylinder. The partition structure divides the gap between the purification cylinder and the pressure outer cylinder into multiple independent filter membrane regions. Multiple filter membrane units are configured, each located within a filter membrane region. The filter membrane units are used to achieve impurity retention and water molecule purification of the raw water. The control assembly controls the flow sequence of raw water among the multiple filter membrane regions. The control assembly enables the raw water to switch flow among the multiple filter membrane regions in a preset order, thereby balancing the usage frequency of each filter membrane region and preventing accelerated clogging of a single filter membrane region due to long-term exposure to high concentrations of scale-forming ions. This ensures that the filter membrane units maintain efficient selective separation, achieving long-term stable operation, significantly extending the service life of the filter membrane units, and reducing equipment maintenance and replacement costs. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of a wastewater purification device based on a reverse osmosis membrane provided in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the water filtration component in a wastewater purification device based on a reverse osmosis membrane, provided in an embodiment of the present invention;

[0025] Figure 3 for Figure 2 A cross-sectional view of the structure shown;

[0026] Figure 4 for Figure 2 The front view of the structure shown;

[0027] Figure 5 for Figure 2 Exploded view of the structure shown;

[0028] Figure 6 for Figure 3 A magnified view of a section at point A in the middle;

[0029] Figure 7 for Figure 3 A magnified view of a section at point B in the middle;

[0030] Figure 8 for Figure 3 A magnified view of a section at point C;

[0031] Figure 9 for Figure 4 A cross-sectional view along the DD direction;

[0032] Figure 10 for Figure 4 Cross-sectional view along the EE direction;

[0033] Figure 11 for Figure 4 A cross-sectional view along the FF direction;

[0034] Figure 12 for Figure 5 A magnified view of a section at point G in the middle;

[0035] Figure 13 for Figure 10 A schematic diagram of the structure of the medium-filtration membrane unit.

[0036] in:

[0037] 110. Bracket; 120. Fixing cylinder;

[0038] 210. Pressure outer cylinder; 220. Water purification cylinder; 221. Water purification hole; 222. Sealing plate; 223. Water purification pipe; 234. Connecting ring; 235. Water outlet valve; 230. Separator plate; 241. Separator component; 242. Separation membrane; 243. Water inlet grid; 244. Isolation component; 251. Water inlet plug; 252. Water outlet plug; 253. Connecting block; 260. Pressure detector;

[0039] 310. Diverter pipe; 320. Concentrate pipe; 330. Inlet pipe; 331. Inlet valve; 340. Liquid inlet pipe; 341. Liquid inlet valve; 351. First solenoid valve; 352. Second solenoid valve. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0041] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] The following reference Figures 1 to 13 This invention describes a wastewater purification device based on a reverse osmosis membrane, as provided in an embodiment of the present invention.

[0044] The wastewater purification equipment based on reverse osmosis membrane provided in this embodiment of the invention includes a support 110, a fixed cylinder 120, a water filtration assembly, a control assembly, and a water supply assembly.

[0045] The bracket 110 is a rigid support structure that is fixedly placed on the ground or other fixed support surface, and is used to provide a stable installation base for other components.

[0046] The fixed cylinder 120 is a hollow cylindrical structure, which is fixedly installed on the bracket 110 in the horizontal direction to provide a working environment that isolates the water filtration assembly from the external environment.

[0047] The water filtration assembly is configured as multiple units, each water filtration assembly including a pressure outer cylinder 210, a water purification cylinder 220, a partition structure and a filter membrane unit.

[0048] The pressure outer cylinder 210 has a hollow cylindrical structure. Multiple pressure outer cylinders 210 are connected in sequence along the horizontal direction and coaxially fixed inside the fixed cylinder 120. The left end of the multiple pressure outer cylinders 210 as a whole is the inlet end of the raw water and the right end is the outlet end of the raw water.

[0049] Each water purification cylinder 220 is coaxially fixed inside the pressure outer cylinder 210. Multiple purification holes 221 are evenly distributed on the cylinder wall of each cylinder 220. These holes serve as the sole outlet channel for water molecules after permeation, guiding purified water molecules into the cylinder 220. A sealing plate 222 is coaxially fixed to the left end of each cylinder 220, providing a complete seal to prevent raw water from flowing directly into the cylinder from the left. A purification pipe 223 is fixedly connected to the right end of each cylinder 220, communicating with the external environment to drain the collected purified water. A water outlet valve 235 is fixedly installed outside the water outlet pipe 223, controlling its on / off state. A connecting ring 234 is provided between each cylinder 220, providing a coaxial, sealed connection between adjacent cylinders.

[0050] The separation structure includes multiple partition plates 230, which are evenly and equidistantly distributed along the circumference of the water purification cylinder 220. One side wall of each partition plate 230 is fixedly connected to the outer wall of the water purification cylinder 220, and the other side wall is fixedly connected to the inner wall of the pressure outer cylinder 210. The multiple partition plates 230 divide the annular gap between the water purification cylinder 220 and the pressure outer cylinder 210 into multiple independent filter membrane regions.

[0051] Multiple filter membrane units are configured, and each filter membrane unit is independently installed in a filter membrane area. Each filter membrane unit includes a separator 241, a separation membrane 242, an inlet water grid 243, and a separation element 244.

[0052] The separator 241 serves as a support layer, undergoing multiple regular bending processes to ensure a tightly distributed, layered structure along the radial direction of the water purification cylinder 220, completely filling the filter membrane area and providing stable support for the separation membrane 242. The separation membrane 242 is a reverse osmosis membrane, completely covering the inner wall surface of the separator 241 and fitting seamlessly with it. The separation membrane 242 selectively separates water molecules, allowing only water molecules to pass through while completely retaining impurities such as salts, colloids, and organic matter in the raw water, making it a core component for wastewater purification. Multiple inlet screens 243 are spaced apart at the radial center of the separation membrane 242 and arranged sequentially along the radial direction of the water purification cylinder 220. The inlet screens 243 provide flow channels for the raw water while ensuring sufficient contact between the raw water and the separation membrane 242. The isolation element 244 is located between two adjacent inlet grids 243 to achieve complete isolation between adjacent inlet grids 243 and prevent raw water in different inlet grids 243 from flowing into each other.

[0053] Along the radial direction of the water purification cylinder 220, the separator 241, separation membrane 242, inlet grid 243, and isolation element 244 together constitute multiple independent flow channels. Each flow channel is distributed sequentially along the radial direction of the water purification cylinder 220, and the structural sequence of each flow channel from the center outward is fixed as inlet grid 243, separation membrane 242, and separator 241. An inlet plug 251 is fixedly installed at the left end of each flow channel, and an outlet plug 252 is fixedly installed at the right end. One end of both the inlet plug 251 and the outlet plug 252 is fixedly engaged with the inner wall of the separation membrane 242, which further prevents raw water from flowing between two adjacent flow channels, ensuring the independence of each flow channel. A connecting block 253 is coaxially fixed between adjacent pressure outer cylinders 210. The connecting block 253 is used to seal and connect the two adjacent pressure outer cylinders 210. Multiple connecting holes are provided on the connecting block 253, and each connecting hole seals and connects two corresponding flow channels in two axially adjacent filter membrane regions.

[0054] The control components include a diversion pipe 310, a concentrate pipe 320, an inlet pipe 330, an inlet pipe 340, a first solenoid valve 351, and a second solenoid valve 352.

[0055] Both the diversion pipe 310 and the concentrate pipe 320 are multi-branched tubular structures, with the number of branches matching the number of filter membrane regions. Each branch of the diversion pipe 310 and the concentrate pipe 320 extends multiple connecting pipes along the axial direction of the water purification cylinder 220, with the number of connecting pipes equal to the number of flow channels in each filter membrane region. Each branch of the diversion pipe 310 is fixedly connected to a filter membrane region, and each connecting pipe on that branch is coaxially and fixedly sealed to the inlet plug 251 at the left end of a flow channel. Each branch of the concentrate pipe 320 is fixedly connected to a filter membrane region, and each connecting pipe on that branch is coaxially and fixedly sealed to the outlet plug 252 at the right end of a flow channel, thereby discharging the concentrate after impurities have been removed.

[0056] The water inlet pipe 330 and the liquid inlet pipe 340 are fixedly installed at the end of the branch pipe 310 away from the branch. The water inlet pipe 330 is used to supply raw water to the branch pipe 310, and an inlet valve 331 is fixedly installed on the water inlet pipe 330 to control the flow of raw water. The liquid inlet pipe 340 is used to supply cleaning fluid to the branch pipe 310. An inlet valve 341 is fixedly installed on the liquid inlet pipe 340 to control the flow of cleaning fluid.

[0057] Multiple first solenoid valves 351 are provided, the number of which is equal to the total number of connecting pipes. Each first solenoid valve 351 is installed at the connection point between a connecting pipe and an inlet plug 251 or an outlet plug 252, and is used to control the on / off state of the connecting pipe. Multiple second solenoid valves 352 are provided, and each second solenoid valve 352 is installed between the two ends of two corresponding flow channels in two adjacent filter membrane regions, and is used to connect or block the flow channels between adjacent filter membrane regions.

[0058] The water supply assembly includes a storage tank, a transfer pump, and transfer pipelines. The storage tank is a closed container, comprising a raw water storage tank and a cleaning fluid storage tank. The raw water storage tank stores the raw water to be purified, and the cleaning fluid storage tank stores the cleaning fluid required for the maintenance of the separation membrane 242. The transfer pump provides power for the flow of the medium. The transfer pump includes a raw water transfer pump and a cleaning fluid transfer pump. The input end of the raw water transfer pump is sealed to the raw water storage tank via a transfer pipeline, and the output end is sealed to the inlet pipe 330 via a transfer pipeline. The input end of the cleaning fluid transfer pump is sealed to the cleaning fluid storage tank via a transfer pipeline, and the output end is sealed to the inlet pipe 340 via a transfer pipeline.

[0059] For ease of description, in this embodiment and the following embodiments, it is taken as an example that the filter membrane region is fixedly set to three. The three filter membrane regions are the first region, the second region and the third region, which are continuously distributed along the circumference of the water purification cylinder 220.

[0060] The equipment has a normal operating mode. In the normal operating mode, the raw water has a first flow path, a second flow path, and a third flow path.

[0061] When the raw water flow path is set to the first flow path, all first solenoid valves 351 connected to the first region on the left are fully open, and all first solenoid valves 351 connected to the second and third regions are fully closed. All second solenoid valves 352 located between the second and third regions on the left are fully open, meaning the corresponding flow channels between the second and third regions are fully connected. All second solenoid valves 352 located between the first and second regions, and between the first and third regions, are fully closed, meaning the corresponding flow channels between the first and second regions, and between the first and third regions, are completely blocked. Similarly, all first solenoid valves 351 connected to the third region on the right are fully open, and all first solenoid valves 351 connected to the first and second regions are closed. All second solenoid valves 352 located between the first and second regions on the right are fully open, meaning the corresponding flow channels between the first and second regions are fully connected. All second solenoid valves 352 located between the third and first regions, and between the third and second regions, are fully closed, meaning the corresponding flow channels between the third and first regions, and between the third and second regions, are completely blocked. In this mode, the raw water flow path passes through the first, second, and third regions sequentially. The raw water first enters the various flow channels of the first zone from the left end, is filtered by the separation membrane 242 and flows out from the right end. It then enters the right end of the flow channel of the second zone through the second solenoid valve 352 opened on the right end, flows out from the left end of the flow channel of the second zone, and then enters the left end of the third zone through the second solenoid valve 352 opened on the left end. Finally, it flows out from the right end of the third zone and merges into the concentrate pipe 320 for discharge.

[0062] When a path switching is required, for example, when the first flow path of raw water is switched to a second flow path, the flow path of the raw water is changed by controlling the on / off states of each first solenoid valve 351 and second solenoid valve 352, so that the raw water passes through the second region, the third region, and the first region in sequence. All first solenoid valves 351 connected to the second region on the left are fully open, and all first solenoid valves 351 connected to the first and third regions are fully closed; all second solenoid valves 352 located between the third and first regions on the left are fully open, that is, the corresponding flow channels between the third and first regions are fully connected, and all second solenoid valves 352 located between the second and first regions and between the second and third regions are fully closed, that is, the corresponding flow channels between the second and first regions and between the second and third regions are completely blocked. All first solenoid valves 351 connected to the first region on the right are fully open, and all first solenoid valves 351 connected to the second and third regions are fully closed. All second solenoid valves 352 located between the second and third regions on the right are fully open, meaning the corresponding flow channels between the second and third regions are fully connected. All second solenoid valves 352 located between the first and second regions, and between the first and third regions, are fully closed, meaning the corresponding flow channels between the first and second regions, and between the first and third regions, are completely blocked. In this mode, the raw water flows sequentially through the second, third, and first regions. The raw water first enters the various flow channels of the second region from the left, is filtered by the separation membrane 242, and flows out from the right. It then enters the right end of the flow channel of the third region through the second solenoid valve 352 opened on the right, flows out from the left end of the flow channel of the third region, then enters the left end of the first region through the second solenoid valve 352 opened on the left, and finally flows out from the right end of the first region and merges into the concentrate pipe 320 for discharge.

[0063] Similarly, by further adjusting the on / off states of the first solenoid valve 351 and the second solenoid valve 352, a third flow path for the raw water can be achieved, namely, a flow path that sequentially passes through the third region, the first region, and the second region. The above-mentioned first, second, and third flow paths for the raw water can be switched as needed to balance the usage frequency of the first, second, and third regions.

[0064] When the equipment is operating in normal working mode, the on / off states of each of the first solenoid valves 351 and the second solenoid valve 352 are adjusted according to the required raw water flow path. Subsequently, the raw water in the raw water storage tank is pressurized by the raw water delivery pump and enters the inlet pipe 330 through the delivery pipeline. The inlet valve 331 is opened to allow the raw water to flow into the diversion pipe 310. Through the branches of the diversion pipe 310 and the opened first solenoid valve 351, the raw water enters each flow channel from the left end. Driven by a pressure of 1-10MPa, the raw water flows along the flow channel. Water molecules pass through the separation membrane 242, enter the interior of the purification cylinder 220 through the purification hole 221, and are finally discharged as product water through the purification pipe 223. Salts and other impurities are intercepted by the separation membrane 242 and flow along the concentrated water along the flow path, finally flowing from the right end through the opened first solenoid valve 351 into the concentrated water pipe 320 for discharge.

[0065] Thus, by controlling the on / off state of the first solenoid valve 351 and the second solenoid valve 352, precise switching of the raw water flow path is achieved. This allows the raw water to circulate in a preset order between the first, second, and third zones, balancing the usage frequency of each zone. This prevents a single filter membrane zone from being continuously subjected to high concentrations of scale-forming ions, which would accelerate clogging. It fundamentally delays the precipitation and crystal adhesion of scale-forming ions such as calcium, magnesium, and silicon, thereby reducing the risk of clogging and ensuring the long-term stable operation of the separation membrane 242 in the filter unit, extending its service life.

[0066] In particular, the equipment also has a cleaning mode during operation. When the equipment enters the cleaning mode, the cleaning fluid has a first cleaning path and a second cleaning path.

[0067] Specifically, first, close the water outlet valve 235 outside the water purification pipe 223 to cut off the water discharge channel and provide a closed environment for the efficient functioning of the cleaning solution in the filter membrane unit.

[0068] The first cleaning path is achieved by controlling the on / off state of the first solenoid valve 351 and the second solenoid valve 352, so that the cleaning fluid enters only one flow channel in each of the first, second and third regions, thereby realizing the expansion and efficiency enhancement of the separation membrane 242.

[0069] For the first, second, and third regions, only the first solenoid valve 351 on the connecting pipes at both ends of a single target flow channel within the corresponding region is opened, while the first solenoid valve 351 corresponding to all other flow channels within the region is closed; at the same time, all second solenoid valves 352 remain completely closed, completely blocking the connection between adjacent flow channels.

[0070] After being pressurized by the cleaning fluid delivery pump, the cleaning fluid flows into the diversion pipe 310 through the inlet pipe 340, and then enters a single target flow channel in the first, second, and third regions through the open first solenoid valve 351. Since only the target flow channels in the first, second, and third regions have cleaning fluid flowing in, and no other medium flows into the other flow channels, the pressure generated by the cleaning fluid acts entirely on the separation membrane 242 in the target flow channel, causing the separation membrane 242 to expand. This removes contaminants adhering to the surface of the separation membrane 242, enhances the contact strength between the cleaning fluid and the separation membrane 242, improves cleaning efficiency, and ensures complete removal of contaminants.

[0071] The second cleaning path is achieved by controlling the on / off state of the first solenoid valve 351 and the second solenoid valve 352, allowing the cleaning fluid to enter one of the flow channels in the first, second, and third zones in sequence at a time, flowing along the multiple flow paths of the raw water, thereby maximizing the utilization rate of the cleaning fluid.

[0072] First, the first solenoid valve 351 corresponding to the left-end connecting pipe of a single target flow channel in the first region is opened on the left, while all other first solenoid valves 351 in the first region are closed. The second solenoid valve 352 located on the left side of the flow channel between the second and third regions is opened, while all second solenoid valves 352 located on the left side between the first and second regions, and between the first and third regions, are closed. On the right side, the first solenoid valve 351 corresponding to the right-end connecting pipe of the flow channel in the second region is opened, and the first solenoid valve 351 corresponding to the right-end connecting pipe of the flow channel in the third region is opened, while all other first solenoid valves 351 in the second and third regions are closed. The second solenoid valve 352 located on the right side of the flow channel between the first and second regions is opened, while all second solenoid valves 352 located on the right side between the first and third regions, and between the second and third regions, are closed. The cleaning fluid enters the target flow channel in the first region via the inlet pipe 340, the diversion pipe 310, and the opened first solenoid valve 351. After flowing along the target flow channel to the right end, it enters the corresponding flow channel in the second region through the opened second solenoid valve 352, then enters the corresponding flow channel in the third region through the opened second solenoid valve 352 at the left end, and finally flows into the concentrate pipe 320 for discharge through the opened first solenoid valve 351 at the right end of the third region. After the target flow channel is cleaned, the target flow channel and flow path can be changed by adjusting the on / off state of the first solenoid valve 351 and the second solenoid valve 352. Thus, the cleaning fluid continuously flows along a fixed single flow path through the corresponding flow channels of the first, second, and third regions. There is no diversion or waste of the cleaning fluid throughout the process, and its effective components can fully act on the separation membranes 242 in the first, second, and third regions, improving the utilization rate of the cleaning fluid.

[0073] This invention also includes a wastewater purification system based on a reverse osmosis membrane, comprising the wastewater purification equipment based on a reverse osmosis membrane in any of the above embodiments. The system includes a pressure detector 260, which is a high-precision pressure sensing structure with real-time pressure signal acquisition and transmission capabilities. Two pressure detectors 260 are fixedly configured. One pressure detector 260 is sealed and fixedly installed on the left-end branch pipe 310, near the branch node of the branch pipe 310, to directly detect the initial pressure of the raw water before it enters the filter membrane area. The other pressure detector 260 is sealed and fixedly installed on the concentrate pipe 320, near the branch node of the concentrate pipe 320, to directly detect the terminal pressure of the raw water after filtration through the filter membrane area and discharge with the concentrate. The pressure detector 260 is used to detect the pressure difference of the raw water flow at both ends of the fixed cylinder 120 in real time, reflecting the degree of clogging of the separation membrane 242. When contaminants adhere to the surface of the separation membrane 242 of the filter membrane unit or when slight clogging occurs, the resistance to raw water flow increases, leading to an increase in the pressure difference between the two ends of the fixed cylinder 120. When the pressure difference reaches the preset pressure difference threshold, the raw water flow path is switched by adjusting the on / off state of the first solenoid valve 351 and the second solenoid valve 352. The pressure difference threshold is an adjustable parameter, and its value can be set according to the actual operating conditions.

[0074] This invention also includes a wastewater purification control method based on a reverse osmosis membrane, applied to the wastewater purification equipment based on a reverse osmosis membrane in any of the above embodiments, comprising the following steps:

[0075] S100, System Initialization and Parameter Preset.

[0076] S110, preset key operating parameters, including pressure difference threshold, selection of raw water flow path sequence, selection of cleaning cycle and cleaning mode.

[0077] S120, set the initial raw water flow path to the default path. For example, set the default path to the first flow path, so that the raw water passes through the first region, the second region, and the third region in sequence.

[0078] S130, close the inlet valve 341 and the cleaning fluid delivery pump to ensure the system is in standby mode.

[0079] S200, start normal working mode.

[0080] S210, open the inlet valve 331 and the outlet valve 235, start the raw water transfer pump, and let the raw water enter the diversion pipe 310 through the inlet pipe 330.

[0081] S220, according to the preset flow path, control the on / off state of the first solenoid valve 351 and the second solenoid valve 352.

[0082] If it is the first flow path, all first solenoid valves 351 in the first region on the left are open, while those in other regions are closed; all first solenoid valves 351 in the third region on the right are open, while those in other regions are closed. The second solenoid valve 352 between the second and third regions on the left is open, while the others are closed; the second solenoid valve 352 between the first and second regions on the right is open, while the others are closed. Raw water flows along the first flow path, sequentially passing through the first, second, and third regions, and finally, concentrated water is discharged from the concentrated water pipe 320.

[0083] S230: Real-time monitoring of the pressure difference between the two ends of the fixed cylinder 120, data is collected by pressure detectors 260 on the left diversion pipe 310 and the right concentrate pipe 320.

[0084] S240. Determine whether the pressure difference exceeds the pressure difference threshold.

[0085] If so, execute S250.

[0086] If not, continue with the current first flow path and execute S260.

[0087] S250, Switch the raw water flow path to the next sequence. For example, switch from the first flow path to the second flow path, so that the raw water passes through the second region, the third region, and the first region in sequence. The switching from the first flow path to the second flow path is achieved by adjusting the on / off state of the first solenoid valve 351 and the second solenoid valve 352.

[0088] S260, continue running and repeat S220 to S250 until the pressure difference between the two ends of the fixed cylinder 120 continuously exceeds the threshold, triggering the cleaning mode; or reaching the preset cleaning cycle.

[0089] S300, start cleaning mode.

[0090] S310, Preparing to switch to cleaning mode. Close inlet valve 331 and raw water transfer pump to stop raw water flow. Close outlet valve 235 to block the discharge of produced water.

[0091] S320. Open the inlet valve 341 and start the cleaning fluid delivery pump to allow the cleaning fluid to enter the diversion pipe 310 through the inlet pipe 340.

[0092] S330. Select the cleaning path and perform the cleaning operation.

[0093] S331, First cleaning path: Control the first solenoid valve 351 and the second solenoid valve 352 so that the cleaning solution enters only one target flow channel in each filter membrane area, while the other flow channels are closed. The pressure of the cleaning solution causes the separation membrane 242 to expand, eliminating contaminant gaps and enhancing the cleaning effect. The cleaning solution flows in from the target channel, acts directly, and then discharges. Repeat the above operation to clean each target flow channel in turn until all flow channels have completed the cleaning process.

[0094] S332, Second cleaning path: Control the first solenoid valve 351 and the second solenoid valve 352 to allow the cleaning solution to flow sequentially through a flow channel of multiple filter membrane regions. For example, the cleaning solution flows sequentially through the first region, the second region, and the third region. The cleaning solution flows along a fixed path, improving utilization. The cleaning solution is finally discharged from the concentrate pipe 320. Repeat the above operation to clean each target flow channel sequentially until all flow channels have completed the cleaning process.

[0095] S340. After cleaning is complete, close the inlet valve 341 and the cleaning fluid delivery pump to stop the supply of cleaning fluid. Open the outlet valve 235 to prepare for resuming normal operation.

[0096] S400, monitoring working status and mode switching.

[0097] S410, monitor the pressure difference, running time or cumulative water production at both ends of the fixed cylinder 120.

[0098] S420. Determine if the conditions for returning to normal working mode are met: If the pressure difference returns to normal and cleaning is completed, execute S430; if the pressure difference is still higher than the pressure difference threshold or cleaning is not completed, return to S300.

[0099] S430: Switch to normal operating mode, shut down cleaning-related components, and open inlet valve 331 and outlet valve 235. Based on historical data, restore the optimal path for raw water flow. Return to S200 to execute normal operating mode.

[0100] S440. If the pressure difference remains abnormal or there is a system error, trigger an alarm and execute S500.

[0101] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A wastewater purification device based on a reverse osmosis membrane, characterized in that, include: A water filtration assembly, comprising a pressure outer cylinder, a water purification cylinder, a partition structure, and a filter membrane unit; the water purification cylinder is coaxially disposed inside the pressure outer cylinder. The partition structure is used to divide the gap between the water purification cylinder and the pressure outer cylinder into multiple filter membrane regions; the filter membrane unit is configured as multiple, and each filter membrane unit is located in one of the filter membrane regions; A control component is provided to control the flow sequence of raw water among multiple filter membrane regions; each filter membrane unit can form multiple independent flow channels; when cleaning fluid is introduced into each filter membrane region, the control component can control the cleaning fluid to enter any one of the flow channels in any one of the filter membrane regions; the control component can also control the cleaning fluid to sequentially enter one of the flow channels in the multiple filter membrane regions. The control component includes a diversion pipe, a concentrate pipe, a first solenoid valve, and multiple second solenoid valves. Both the diversion pipe and the concentrate pipe have multiple branches, and each branch is fixedly connected to one of the filter membrane regions, and each branch can be connected to a flow channel. The first solenoid valve is fixedly disposed on the branches of the diversion pipe and the concentrate pipe, and is used to control the raw water or cleaning solution to enter the preset flow channel. Each second solenoid valve is fixedly installed between the two ends of two corresponding flow channels in two adjacent filter membrane regions, and is used to realize the connection or blockage of the flow channels between adjacent filter membrane regions.

2. The wastewater purification equipment based on a reverse osmosis membrane according to claim 1, characterized in that, The partition structure includes multiple partition plates, which are evenly distributed along the circumference of the water purification cylinder. One side wall of each partition plate is connected to the outer wall of the water purification cylinder, and the other side wall is connected to the inner wall of the pressure outer cylinder.

3. The wastewater purification equipment based on a reverse osmosis membrane according to claim 1, characterized in that, The plurality of flow channels in each of the filter membrane regions are distributed radially along the water purification cylinder.

4. The wastewater purification equipment based on a reverse osmosis membrane according to claim 3, characterized in that, The filter membrane unit includes a separator, a separation membrane, and an inlet grid. The separator is bent multiple times to form a tightly layered distribution along the radial direction of the water purification cylinder. The separation membrane covers the inner wall of the separator, and multiple flow channels are located in the middle of the separation membrane. Multiple inlet grids are provided, and the multiple inlet grids are spaced apart at the radial center of each layer of the separation membrane. Each inlet grid is located in one flow channel, and an isolation element is provided between two adjacent inlet grids to restrict raw water from entering the adjacent flow channels.

5. The wastewater purification equipment based on a reverse osmosis membrane according to claim 1, characterized in that, Each of the flow channels is fixedly provided with an inlet block and an outlet block at both ends, and the inlet block and the outlet block are used to isolate the two ends of the multiple flow channels.

6. A wastewater purification system based on a reverse osmosis membrane, comprising the wastewater purification equipment based on a reverse osmosis membrane as described in any one of claims 1-5, characterized in that, It also includes pressure detectors, of which two are provided. The two pressure detectors are used to detect the pressure value of the raw water at both ends of the flow path, so as to adjust the flow order of the raw water among the multiple filter membrane regions according to the pressure difference.

7. A wastewater purification and control method based on a reverse osmosis membrane, used to execute the wastewater purification equipment based on a reverse osmosis membrane as described in any one of claims 1-5, characterized in that, Includes the following steps: S100. In normal operating mode, the control component controls the raw water to enter multiple filter membrane areas and alternates the flow order of the raw water among the multiple filter membrane areas so that the multiple filter membrane areas have a uniform degree of clogging. S200. In cleaning mode, the control component controls the flow of cleaning fluid within the filter membrane area; S300: Monitor the working status through the control component and switch between normal working mode and cleaning mode.

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