An RO water treatment system and method

Abstract

This invention discloses an RO water treatment system and method, relating to the field of water treatment technology. The invention includes multiple reverse osmosis modules and an auxiliary cleaning module located at their wastewater discharge end. Each reverse osmosis module contains axially stacked conical filter sections, each composed of a conical RO membrane and an isolation skeleton layer. Wastewater collection gaps are formed around the filter element for centralized discharge. Periodic reverse water flow flushing is achieved through a positive pressure chamber and a thrust piston, combined with piezoelectric vibration on the RO membrane surface, reducing membrane fouling. The system can use wastewater as feed water for subsequent stages, achieving high-recovery-rate water treatment.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to an RO water treatment system and method. Background Technology

[0002] Existing RO water treatment systems typically employ spiral wound membrane modules, with the filter elements arranged in a regular cylindrical pattern. Due to structural geometric limitations, wastewater in traditional RO systems flows unidirectionally along the membrane surface and is discharged. The simple wastewater channel organization easily leads to the formation of localized high-concentration zones on the membrane surface, resulting in severe scaling, contaminant adhesion, and rapid membrane performance degradation. Furthermore, traditional RO membranes are usually completely passive filtration elements; surface fouling can only be removed by the shear force of the water flow, offering limited effectiveness against existing crystals or stubborn fouling layers, leading to an irreversible decrease in membrane flux. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: an RO water treatment system, comprising a steel frame, a main inlet pipe, a main outlet pipe for purified water, a booster pipe, and a main wastewater pipe. Multiple reverse osmosis modules and auxiliary cleaning modules are fixedly mounted on the steel frame, wherein the auxiliary cleaning module is located between the wastewater outlet end of the reverse osmosis module and the main wastewater pipe. Each reverse osmosis module consists of multiple filter housing pipes arranged vertically, with a filter element assembly inserted into each filter housing pipe. The filter element assembly is sealed inside the filter housing pipe by a filter element assembly plug. The filter element assembly plug is fitted to the inside of the filter housing pipe using threads and sealing rings, facilitating filter element assembly replacement. Multiple filter sections are stacked inside the filter element assembly. The inlet end of all filter sections is connected to the inlet distribution pipe, and the purified water end of all filter sections is connected to the purified water collection pipe. Multiple wastewater perforations are evenly distributed on the circumferential surface of the filter element assembly, and these perforations are connected to the drain ends of all filter sections.

[0004] Furthermore, multiple support and centering bars are fixed on the inner wall of the filter housing pipe to support the filter element assembly at its axial position, creating a gap between the outer wall of the filter element assembly and the inner wall of the filter housing pipe. The filter element assembly plug has multiple wastewater discharge channels converging towards its axial position inside. The plug is also equipped with wastewater drain nozzles that communicate with all the wastewater discharge channels, and all wastewater discharge channels are connected to the gap between the filter element assembly and the filter housing pipe. A positioning abutment is fixedly installed at the end of the filter housing pipe away from the filter element assembly plug, contacting one end of the filter element assembly. One of the support and centering bars has interlocking grooves at its contact point with the circumferential surface of the filter element assembly, used to position the filter element assembly within the filter housing pipe.

[0005] Furthermore, one end of the filter housing pipe is fixedly equipped with a water inlet connector and a purified water connector. The water inlet distribution pipe can be coaxially inserted into the water inlet connector, and the purified water collection pipe can be coaxially inserted into the purified water connector. A sealing ring is provided at the connection between the water inlet connector and the water inlet distribution pipe, and a sealing ring is provided at the connection between the purified water connector and the purified water collection pipe.

[0006] Furthermore, the filtration unit includes a first conical RO membrane, a conical isolation frame layer, a second conical RO membrane, and a sealant layer stacked sequentially. Piezoelectric ceramic sheets are attached to the surfaces of the first and / or second conical RO membranes. The power supply lines of the piezoelectric ceramic sheets are sealed through the sealant layer and ultimately led out through wastewater flow holes and filter housing pipes. The conical isolation frame layer is positioned between the first and second conical RO membranes to support them, creating a space between them that allows water to flow. The edges between the first and second conical RO membranes in adjacent filtration units are sealed with the sealant layer.

[0007] Furthermore, a water inlet slot is provided on the water inlet distribution pipe, and a clean water slot is provided on the clean water collection pipe. The gap between the first conical RO membrane and the second conical RO membrane is aligned with the water inlet slot, and the clean water slot is aligned with the position between the two adjacent filter sections, which is the position of the sealant layer.

[0008] Furthermore, the auxiliary cleaning module includes a positive pressure cylinder, a flow-pushing piston, a guide air pipe, and a wastewater diversion pipe. The top of the positive pressure cylinder is connected to the booster air pipe through the guide air pipe, and the bottom of the positive pressure cylinder is connected to the wastewater diversion pipe. All wastewater drain nozzles in each reverse osmosis module are connected to the wastewater diversion pipe in parallel. The wastewater diversion pipe is connected to the main wastewater pipeline through a valve. A flow-pushing piston is slidably installed on the inner wall of the positive pressure cylinder.

[0009] Furthermore, one end of the booster pipe is sealed, and the other end of the booster pipe is connected to the exhaust port of the positive pressure pump. The booster pipe provides a positive pressure environment to the inside of the positive pressure cylinder cavity through the guide pipe, which is used to push the thrust piston to move to the bottom of the positive pressure cylinder cavity.

[0010] Furthermore, all water inlets in each reverse osmosis module are connected to the water outlet manifold, and all water outlet manifolds corresponding to each reverse osmosis module are connected to the main water outlet pipe; all water inlets in each reverse osmosis module are connected to an external independent water inlet pipe, and all external independent water inlets corresponding to each reverse osmosis module are connected to the main water inlet pipe; the filtration section is penetrated by the water inlet distribution pipe and the water outlet manifold, and the conical RO membrane one and conical RO membrane two in the filtration section are sealed at the junction of the water inlet distribution pipe and the water outlet manifold. A control cabinet is also fixedly installed on the steel frame.

[0011] A method for treating water using an RO water treatment system includes the following steps: Step 1: The water to be treated is input through the main inlet pipe and distributed to the inlet distribution pipes of each reverse osmosis module through an external independent inlet pipe, allowing the water to enter the conical filtration section within the filter cartridge assembly; Step 2: The water flows radially from the axis to the outer periphery within the conical isolation frame layer. Under the pressure generated by the wastewater diversion pipe and valves, some water passes through conical RO membrane two and conical RO membrane one to form purified water, which then enters the purified water collection pipe through the purified water slot and is discharged; Step 3: Wastewater that does not pass through the conical RO membrane enters the outer wall of the filter cartridge assembly through the wastewater perforation holes and flows with the purified water. The gap between the inner walls of the filter housing and the pipe is discharged to the diversion wastewater pipe through the wastewater discharge channel and wastewater drain nozzle; Step 4: Periodically interrupt the water supply of the main water inlet pipe, and input positive pressure gas into the positive pressure cylinder cavity through the pressurization gas pipe to drive the flow piston to move, so that the water in the positive pressure cylinder cavity will flow in reverse, and backwash the conical isolation skeleton layer and the surface of the conical RO membrane; Step 5: Intermittently supply power to the piezoelectric ceramic plates set on the surface of conical RO membrane one and / or conical RO membrane two, so that the conical RO membrane will vibrate, and in conjunction with the water flow scouring, remove the impurities and crystals attached to the membrane surface.

[0012] Compared with the prior art, the present invention has the following advantages: (1) The present invention designs the filter section as a conical RO membrane structure that is continuously stacked along the axial direction, so that the ineffective space at both ends of the filter element group due to the geometric structure becomes a constant independent of the effective length of the filter element. Thus, when the length of the filter element increases, the proportion of the effective space in the middle that can be used for continuous stacking of the filter section is increased; (2) The present invention introduces an auxiliary cleaning module consisting of a positive pressure cylinder and a pusher piston at the sewage discharge end of the reverse osmosis module, and forms a controllable periodic reverse flushing mechanism by the mutual push of positive gas pressure and hydraulic pressure. There is no need to set up a complicated backwash pump or multi-stage switching valve. By simply interrupting the water intake for a short time and releasing the air pressure, the conical isolation skeleton layer and the surface of the RO membrane can generate water flow in opposite directions to flush; (3) The present invention integrates piezoelectric ceramic sheets on the surface of the conical RO membrane and leads out its power supply line through the sealing layer and wastewater channel, so that the membrane has controllable vibration capability without damaging the sealing performance. By intermittently exciting the piezoelectric ceramic, the RO membrane generates micro-amplitude high-frequency vibrations, which can effectively destroy the adhesion interface between the crystals and the membrane surface, causing impurities to detach from the membrane surface and be carried away by the water flow. This physically slows down the membrane fouling process and significantly extends the continuous working life of the membrane module. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall invention.

[0014] Figure 2 This is a schematic diagram of the positive pressure cylinder cavity of the present invention.

[0015] Figure 3 This is a schematic diagram of the filter housing and piping of the present invention.

[0016] Figure 4 This is a schematic diagram of the filter element assembly plugging cap of the present invention.

[0017] Figure 5 This is a schematic diagram of the distribution of the centering bars supporting the invention.

[0018] Figure 6 This is a schematic diagram of the internal structure of the filter cartridge assembly of the present invention.

[0019] Figure 7 This is an exploded view of the filter section structure of the present invention.

[0020] Figure 8 This is a schematic diagram showing the installation position of the filter section of the present invention.

[0021] Figure 9 For the present invention Figure 8 Enlarged view of point A in the middle.

[0022] In the diagram: 1-Steel frame; 2-Control cabinet; 301-Filter housing pipe; 302-Water inlet connector; 303-Clean water connector; 304-Positioning butt; 305-Filter cartridge assembly; 306-Wastewater flow hole; 307-Filter cartridge assembly plug; 308-Wastewater drain nozzle; 309-Wastewater discharge channel; 310-Supporting centering strip; 311-Water inlet distribution pipe; 312-Clean water collection pipe; 313-Water inlet groove; 314 - Water purification trench; 315- Conical RO membrane one; 316- Conical isolation skeleton layer; 317- Conical RO membrane two; 318- Sealant layer; 4- Main water inlet pipe; 5- Main water discharge pipe; 6- Booster air pipe; 7- Main wastewater pipe; 8- Valve; 901- Positive pressure cylinder cavity; 902- Flow piston; 903- Guide air pipe; 904- Divert wastewater pipe; 10- External independent water inlet pipe; 11- Clean water discharge manifold. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figures 1-9This invention provides an RO water treatment system, including a steel frame 1, a main inlet pipe 4, a main outlet pipe 5 for purified water, a booster pipe 6, and a main wastewater pipe 7. Multiple reverse osmosis modules and an auxiliary cleaning module are fixedly mounted on the steel frame 1. The auxiliary cleaning module is located between the wastewater outlet end of the reverse osmosis module and the main wastewater pipe 7. Each reverse osmosis module consists of multiple filter housing pipes 301 arranged vertically. A filter element assembly 305 is inserted into each filter housing pipe 301, and the filter element assembly 305 is sealed within the filter housing pipe 301 by a filter element assembly plug 307. The filter element assembly plug 307 is fitted onto the inside of the filter housing pipe 301 using threads and a sealing ring, facilitating the replacement of the filter element assembly 305. The filter cartridge assembly 305 has multiple sets of filter sections stacked inside. The water inlet end of all filter sections is connected to the water inlet distribution pipe 311, and the clean water end of all filter sections is connected to the clean water collection pipe 312. Multiple wastewater through holes 306 are also evenly opened on the circumferential surface of the filter cartridge assembly 305. The wastewater through holes 306 are connected to the sewage discharge end of all filter sections. Multiple support and centering bars 310 are fixed on the inner wall of the filter housing pipe 301 to support the filter element assembly 305 located at the axial position of the filter housing pipe 301, so that there is a gap between the outer wall surface of the filter element assembly 305 and the inner wall surface of the filter housing pipe 301; the filter element assembly plug 307 has multiple wastewater discharge channels 309 that converge towards its own axial position inside; the filter element assembly plug 307 is also equipped with wastewater drain nozzles 308 that communicate with all the wastewater discharge channels 309, and all the wastewater discharge channels 309 are connected to the gap between the filter element assembly 305 and the filter housing pipe 301. A positioning abutment 304 is fixedly fitted at the end of the filter housing pipe 301 away from the filter element assembly plug 307. The positioning abutment 304 contacts one end of the filter element assembly 305. One of the supporting centering bars 310 has interlocking grooves at its contact position with the circumferential surface of the filter element assembly 305, used to position the filter element assembly 305 within the filter housing pipe 301. A water inlet nozzle 302 and a purified water inlet nozzle 303 are fixedly fitted at one end of the filter housing pipe 301. The water inlet distribution pipe 311 can be coaxially inserted into the water inlet nozzle 302, and the purified water collection pipe 312 can be coaxially inserted into the purified water inlet nozzle 303. A sealing ring is provided at the connection between the water inlet nozzle 302 and the water inlet distribution pipe 311, and a sealing ring is provided at the connection between the purified water inlet nozzle 303 and the purified water collection pipe 312.

[0025] The filtration unit includes a conical RO membrane 315, a conical isolation frame layer 316, a conical RO membrane 317, and a sealant layer 318 stacked sequentially. Piezoelectric ceramic sheets (arc-shaped for better fit to the conical RO membrane surface) are attached to the surfaces of the conical RO membrane 315 and / or the conical RO membrane 317. The power supply lines of the piezoelectric ceramic sheets are sealed through the sealant layer 318 and ultimately led out through the wastewater flow hole 306 and the filter housing pipe 301. The conical isolation frame layer 316 is positioned between the conical RO membrane 315 and the conical RO membrane 317 to support them, creating a space between them for water flow. The edges between the conical RO membranes 315 and 317 in adjacent filtration units are sealed by the sealant layer 318. The water inlet distribution pipe 311 has a water inlet groove 313, and the purified water collection pipe 312 has a purified water groove 314. The gap between the conical RO membrane 1 315 and the conical RO membrane 2 317 is aligned with the water inlet groove 313, and the purified water groove 314 is aligned with the position between the two adjacent filter sections, which is the position of the sealant layer 318.

[0026] The auxiliary cleaning module includes a positive pressure chamber 901, a thrust piston 902, a guide air pipe 903, and a wastewater diversion pipe 904. The top of the positive pressure chamber 901 is connected to the booster air pipe 6 via the guide air pipe 903, and the bottom of the positive pressure chamber 901 is connected to the wastewater diversion pipe 904. All wastewater drain nozzles 308 in each reverse osmosis module are connected to the wastewater diversion pipe 904 in parallel. The wastewater diversion pipe 904 is connected to the main wastewater pipe 7 via a valve 8. The thrust piston 902 is slidably mounted on the inner wall of the positive pressure chamber 901. One end of the booster air pipe 6 is sealed, and the other end is connected to the exhaust port of the positive pressure air pump. The booster air pipe 6 provides a positive pressure environment to the inside of the positive pressure chamber 901 via the guide air pipe 903, which pushes the thrust piston 902 to move towards the bottom of the positive pressure chamber 901.

[0027] All water inlets 303 in each reverse osmosis module are connected to the water outlet manifold 11, and all water outlet manifolds 11 corresponding to each reverse osmosis module are connected to the main water outlet pipe 5. All water inlets 302 in each reverse osmosis module are connected to the external independent water inlet pipe 10, and all external independent water inlet pipes 10 corresponding to each reverse osmosis module are connected to the main water inlet pipe 4. The filtration section is penetrated by the water inlet distribution pipe 311 and the water outlet manifold 312, and the conical RO membrane 1 315 and conical RO membrane 2 317 in the filtration section are sealed at the junction of the water inlet distribution pipe 311 and the water outlet manifold 312. A control cabinet 2 is also fixedly installed on the steel frame 1.

[0028] Connect the main wastewater pipe 7 to the sewage pipe, or connect the main wastewater pipe 7 to the inlet main pipe 4 of the next RO water treatment system, and arrange them in series. The number of filter housing pipes 301 in each RO water treatment system's reverse osmosis module should be half the number in the previous group. This improves wastewater utilization and reduces wastewater discharge. Connect the booster air pipe 6 to the positive pressure pump to provide positive pressure to all positive pressure chambers 901. Connect the main purified water discharge pipe 5 to the purified water discharge end of the entire RO water treatment system, and connect the inlet main pipe 4 to the water requiring purification.

[0029] Working process: The water to be treated is input into the filter housing pipe 301 through the main inlet pipe 4. Specifically, the main inlet pipe 4 supplies water to the external independent inlet pipe 10, which distributes the water to the corresponding inlet distribution pipe 311 in the filter housing pipe 301 of each reverse osmosis module. The water then enters the conical isolation frame layer 316 through the inlet slot 313, and then flows through the conical isolation frame layer 316 and the wastewater flow hole 306 into the gap between the outer wall of the filter element group 305 and the inner wall of the filter housing pipe 301. Finally, the water is discharged from the filter housing pipe 301 through the wastewater discharge channel 309 and the wastewater drain nozzle 308. The discharged water will flow back to the distribution pipe 301. The water flows into the wastewater pipe 904, then through the valve 8 into the main wastewater pipe 7. The flow rate inside the wastewater pipe 904 can be controlled by reducing the opening of the valve 8. This will cause the water pressure on the side of the wastewater pipe 904 where the valve 8 is located to increase. This water pressure also exists at the conical isolation skeleton layer 316. Under the action of pressure, the water will pass through the conical RO membrane 2 317 and the conical RO membrane 1 315. The conical RO membrane 1 315 and the conical RO membrane 2 317 will block the impurities and crystals in the water. Then, the water will enter the clean water collection pipe 312 through the clean water slot 314 and finally flow into the clean water discharge collection pipe 11. The clean water discharge collection pipe 11 discharges the clean water into the clean water discharge main pipe 5.

[0030] Initially, due to the water pressure in the diversion wastewater pipe 904, some pressure is transmitted to the positive pressure chamber 901. This pressure overcomes the air pressure provided by the booster pipe 6, and then pushes the thrust piston 902 to the top of the positive pressure chamber 901. Since the water in the conical isolation skeleton layer 316 flows in one direction (i.e., from the axis of the conical isolation skeleton layer 316 to the edge), impurities in the water will accumulate on one side (the conical isolation skeleton layer 316 is also a solid, and will partially intercept these impurities). At this time, the water pressure supply at the main water inlet pipe 4 can be stopped periodically (e.g., stop for one second every hour), so the water flowing from the water inlet distribution pipe 311 towards the conical isolation skeleton layer 316 will stop. Under the action of positive pressure gas at the booster pipe 6, the pusher piston 902 inside the positive pressure cylinder 901 will move downward. The pusher piston 902 will squeeze the water inside the positive pressure cylinder 901 to flow back (part of it will flow through the valve 8 into the wastewater main pipe 7). This backflow of water will cause the water at the conical isolation skeleton layer 316 to flow in the opposite direction, thereby rinsing the conical isolation skeleton layer 316 (the surfaces of the conical RO membrane 1 315 and the conical RO membrane 2 317 cannot be absolutely smooth, so impurities will also accumulate, and the impurities on the surfaces of the conical RO membrane 1 315 and the conical RO membrane 2 317 will also be rinsed). In addition, the piezoelectric ceramics on the conical RO membrane 315 and the conical RO membrane 317 can be activated intermittently to cause the conical RO membrane 315 and the conical RO membrane 317 to vibrate, shaking off and separating the impurities and crystals attached to the surface. Combined with the flushing of water, these impurities are washed away, reducing the amount of impurities accumulated on the surface of the conical RO membrane 315, the conical isolation skeleton layer 316, and the conical RO membrane 317, thus extending their service life.

[0031] The filter section is set in a conical shape because the ineffective space at both ends of the filter element assembly 305 due to structural geometric constraints is a constant independent of the length of the filter element assembly 305. Therefore, as the effective length of the filter element assembly 305 increases (the filter housing pipe 301 and the filter element assembly 305 in the figure are not actual proportional lengths), the proportion of the space in the middle that can be used for continuous stacking of filter sections without waste increases continuously, thereby monotonically increasing the total area of ​​the filter section that can actually achieve the desired function.

Claims

1. An RO water treatment system, comprising a steel frame (1), a main inlet pipe (4), a main outlet pipe for purified water (5), a booster pipe (6), and a main wastewater pipe (7), characterized in that: Multiple sets of reverse osmosis modules and auxiliary cleaning modules are fixedly mounted on the steel frame (1), wherein the auxiliary cleaning module is located between the sewage discharge end of the reverse osmosis module and the main wastewater pipeline (7); The reverse osmosis module consists of multiple filter housing pipes (301) arranged vertically. Each filter housing pipe (301) contains a filter element group (305), and the filter element group (305) is sealed inside the filter housing pipe (301) by a filter element group plug (307). The filter cartridge assembly (305) has multiple sets of filter sections stacked inside. The inlet end of all filter sections is connected to the water distribution pipe (311), and the clean water end of all filter sections is connected to the clean water collection pipe (312). Multiple wastewater through holes (306) are also evenly opened on the circumferential surface of the filter cartridge assembly (305). The wastewater through holes (306) are connected to the sewage discharge end of all filter sections.

2. The RO water treatment system according to claim 1, characterized in that: Multiple support and centering bars (310) are fixed on the inner wall of the filter housing pipe (301) to support the filter element assembly (305) located at the axial position of the filter housing pipe (301), so that there is a gap between the outer wall surface of the filter element assembly (305) and the inner wall surface of the filter housing pipe (301); multiple wastewater discharge channels (309) are opened inside the filter element assembly plug (307) and converge towards its own axial position. Wastewater drain nozzles (308) that communicate with all wastewater discharge channels (309) are also provided on the filter element assembly plug (307), and all wastewater discharge channels (309) are connected to the gap between the filter element assembly (305) and the filter housing pipe (301).

3. The RO water treatment system according to claim 2, characterized in that: One end of the filter housing pipe (301) is fixedly equipped with a water inlet nozzle (302) and a clean water inlet nozzle (303), wherein the water inlet distribution pipe (311) can be coaxially inserted into the water inlet nozzle (302), and the clean water collection pipe (312) can be coaxially inserted into the clean water inlet nozzle (303).

4. The RO water treatment system according to claim 3, characterized in that: The filtration unit includes a conical RO membrane I (315), a conical isolation frame layer (316), a conical RO membrane II (317), and a sealant layer (318) stacked sequentially. Piezoelectric ceramic sheets are attached to the surfaces of the conical RO membrane I (315) and / or the conical RO membrane II (317). The conical isolation frame layer (316) is disposed between the conical RO membrane I (315) and the conical RO membrane II (317) to support the conical RO membrane I (315) and the conical RO membrane II (317), so that there is a space between the conical RO membrane I (315) and the conical RO membrane II (317) that allows water to flow. The edges between the conical RO membrane I (315) and the conical RO membrane II (317) in two adjacent filtration units are sealed by the sealant layer (318).

5. The RO water treatment system according to claim 4, characterized in that: A water inlet slot (313) is provided on the water inlet distribution pipe (311), and a water purification slot (314) is provided on the water purification collection pipe (312). The gap between the first conical RO membrane (315) and the second conical RO membrane (317) is aligned with the water inlet slot (313), and the water purification slot (314) is aligned with the position between the two adjacent filter sections.

6. The RO water treatment system according to claim 5, characterized in that: The auxiliary cleaning module includes a positive pressure cylinder (901), a flow piston (902), a guide air pipe (903), and a diversion wastewater pipe (904). The top of the positive pressure cylinder (901) is connected to the pressurization air pipe (6) through the guide air pipe (903), and the bottom of the positive pressure cylinder (901) is connected to the diversion wastewater pipe (904). All wastewater drain nozzles (308) in each reverse osmosis module are connected to the diversion wastewater pipe (904) in parallel. The diversion wastewater pipe (904) is connected to the main wastewater pipe (7) through a valve (8). A flow piston (902) is slidably installed on the inner wall of the positive pressure cylinder (901).

7. The RO water treatment system according to claim 6, characterized in that: One end of the booster pipe (6) is sealed, and the other end of the booster pipe (6) is connected to the exhaust port of the positive pressure pump. The booster pipe (6) provides a positive pressure environment to the inside of the positive pressure cylinder cavity (901) through the guide pipe (903) to push the thrust piston (902) to move to the bottom of the positive pressure cylinder cavity (901).

8. The RO water treatment system according to claim 7, characterized in that: All water inlets (303) in each reverse osmosis module are connected to the water outlet manifold (11), and the water outlet manifold (11) of each reverse osmosis module is connected to the main water outlet pipe (5); all water inlets (302) in each reverse osmosis module are connected to the external independent water inlet pipe (10), and the external independent water inlet pipe (10) of each reverse osmosis module is connected to the main water inlet pipe (4); the filter section is penetrated by the water inlet distribution pipe (311) and the water collection pipe (312), and the conical RO membrane one (315) and conical RO membrane two (317) in the filter section are sealed at the junction of the water inlet distribution pipe (311) and the water collection pipe (312).

9. A method for treating water using an RO water treatment system, characterized in that, Includes the following steps: Step 1: Input the water to be treated through the main water inlet pipe (4) and distribute it to the water inlet distribution pipe (311) in each reverse osmosis module through the external independent water inlet pipe (10), so that the water enters the conical filter section in the filter cartridge group (305); Step 2: Water flows radially from the axis to the outer periphery within the conical isolation skeleton layer (316). Under the pressure formed by the diversion wastewater pipe (904) and valve (8), some water passes through the conical RO membrane II (317) and conical RO membrane I (315) to form clean water, and enters the clean water collection pipe (312) through the clean water slot (314) for collection and discharge. Step 3: Wastewater that does not pass through the conical RO membrane enters the gap between the outer wall of the filter cartridge (305) and the inner wall of the filter housing pipe (301) through the wastewater through-hole (306), and is discharged to the diversion wastewater pipe (904) through the wastewater discharge channel (309) and wastewater drain nozzle (308). Step 4: Periodically interrupt the water supply of the main water inlet pipe (4) and input positive pressure gas into the positive pressure cylinder cavity (901) through the booster gas pipe (6) to drive the flow piston (902) to move, so that the water in the positive pressure cylinder cavity (901) will flow in reverse to backwash the conical isolation skeleton layer (316) and the surface of the conical RO membrane. Step 5: Intermittently supply power to the piezoelectric ceramic sheet set on the surface of conical RO membrane one (315) and / or conical RO membrane two (317) to make the conical RO membrane vibrate, and in conjunction with the water flow, peel off the impurities and crystals attached to the membrane surface.

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