Double-membrane water treatment system

Abstract

The utility model relates to the technical field of water purification, in particular to a double-membrane water treatment system. According to the double-membrane water treatment system, a water inlet of an ultrafiltration assembly is communicated with a water outlet end of a raw water pipe, a water outlet of the ultrafiltration assembly is communicated with a water inlet end of an ultrafiltration water pipe, and a water outlet end of the ultrafiltration water pipe is communicated with a water inlet of an ultrafiltration water tank; the compressed air pipe is communicated with the water outlet end of the ultrafiltration assembly; the water inlet end of the backwashing pipe is communicated with the water outlet of the ultrafiltration water tank, the water outlet end of the backwashing pipe is communicated with the water outlet end of the ultrafiltration assembly, and a backwashing pump is arranged on the backwashing pipe; the backwashing drain pipe is communicated with a water inlet of the ultrafiltration assembly; the control device comprises a control valve and a controller, the control valve is in signal connection with the controller, and the controller is in signal connection with the backwashing pump.

Description

A dual-membrane water treatment system Technical Field

[0001] This utility model relates to the field of water purification technology, specifically to a dual-membrane water treatment system. Background Technology

[0002] In the production of beverages such as fruit juices, nuts, and beans, water is the most important raw material. Because raw water contains a variety of impurities, if it is added directly to the production process, it will not only affect the taste and flavor of the product, but also affect the consumer's perception. Therefore, it is necessary to filter the raw water to remove various impurities before it is introduced into the production process.

[0003] Ultrafiltration is an essential step in the raw water filtration process. By using an ultrafiltration filter, the ultrafiltration membrane inside the filter effectively filters suspended particles, colloids, microorganisms, and other contaminants from the raw water. After working for a period of time, the ultrafiltration filter needs to be cleaned; otherwise, a large amount of impurities will accumulate on the ultrafiltration membrane, making filtration impossible. Usually, cleaning an ultrafiltration filter requires disassembling it and manually rinsing the ultrafiltration membrane to remove impurities. However, this cleaning method is time-consuming and labor-intensive, affecting production efficiency. Summary of the Invention

[0004] In view of this, the present invention provides a dual-membrane water treatment system to solve the problem that cleaning an ultrafiltration filter requires disassembling the ultrafiltration filter, which results in a long cleaning time, high labor costs, and reduced production efficiency.

[0005] This utility model provides a dual-membrane water treatment system, comprising:

[0006] An ultrafiltration unit, wherein the inlet of the ultrafiltration unit is connected to the outlet of the raw water pipe, the outlet of the ultrafiltration unit is connected to the inlet of the ultrafiltration water pipe, and the outlet of the ultrafiltration water pipe is connected to the inlet of the ultrafiltration water tank.

[0007] A compressed air pipe, which is connected to the water outlet of the ultrafiltration unit;

[0008] A backwashing pipe is provided, with its inlet end connected to the outlet of the ultrafiltration water tank and its outlet end connected to the outlet of the ultrafiltration module. A backwashing pump is also provided on the backwashing pipe.

[0009] A backwash drain pipe, which is connected to the inlet of the ultrafiltration unit;

[0010] A control device, comprising a control valve and a controller, wherein the control valve is signal-connected to the controller, the control valve comprising a first control valve disposed on the raw water pipe, a second control valve disposed on the ultrafiltration water pipe, a third control valve disposed on the compressed air pipe, a fourth control valve disposed on the backwash pipe, and a fifth control valve disposed on the backwash drain pipe, and the controller is signal-connected to the backwash pump.

[0011] In one optional embodiment, the ultrafiltration assembly includes a plurality of ultrafiltration water filters, each ultrafiltration water filter having a first connection port, a second connection port, a third connection port, and a fourth connection port.

[0012] The raw water pipe includes a main raw water pipe and several branch raw water pipes. Each branch raw water pipe corresponds to one of the ultrafiltration water filters. One end of each branch raw water pipe is connected to the outlet of the main raw water pipe, and the other end of each branch raw water pipe is connected to the first connection port. The backwash drain pipe is connected to several of the branch raw water pipes respectively.

[0013] The ultrafiltration water pipe includes an ultrafiltration main pipe and several ultrafiltration branch pipes. Each ultrafiltration branch pipe corresponds to an ultrafiltration water filter. One end of each ultrafiltration branch pipe is connected to the water inlet of the ultrafiltration main pipe, and the other end of each ultrafiltration branch pipe is connected to the second connection port. The backwashing pipe is connected to several of the ultrafiltration branch pipes respectively.

[0014] The compressed air pipe includes a main compressed air pipe and several branch compressed air pipes. Each branch compressed air pipe corresponds to one of the ultrafiltration water filters. One end of each branch compressed air pipe is connected to the main ultrafiltration pipe, and the other end of each branch compressed air pipe is connected to the third connection port.

[0015] In one optional embodiment, the backwash drain pipe includes an upper drain pipe and a lower drain pipe. The upper drain pipe is connected to several of the raw water branch pipes. The fifth control valve is disposed on the upper drain pipe. The lower drain pipe is connected to the fourth connection port. The control valve includes a sixth control valve disposed on the lower drain pipe.

[0016] In one optional embodiment, the system further includes a reverse osmosis filter, which is connected to the outlet of the ultrafiltration water tank via a reverse osmosis inlet pipe and to the inlet of the RO water tank via a reverse osmosis outlet pipe.

[0017] In one optional embodiment, it further includes: a reverse osmosis circulation pipe, the inlet end of which is connected to the reverse osmosis outlet pipe, the outlet end of which is connected to the reverse osmosis inlet pipe, a seventh control valve being provided at the inlet of the RO water tank, an eighth control valve being provided on the reverse osmosis circulation pipe, and the seventh control valve and the eighth control valve being signal-connected to the controller.

[0018] In one optional embodiment, the system further includes a reverse osmosis cleaning assembly, which includes a cleaning buffer tank, a cleaning pump, a first cleaning pipe, and a second cleaning pipe. The cleaning buffer tank contains cleaning fluid and is connected to the cleaning pump. The cleaning pump is connected to the reverse osmosis inlet pipe through the first cleaning pipe, and the cleaning buffer tank is connected to the reverse osmosis outlet pipe through the second cleaning pipe.

[0019] In one optional embodiment, the reverse osmosis cleaning assembly further includes a cleaning filter, which is connected to both the cleaning pump and the first cleaning pipe.

[0020] In one optional embodiment, a ninth control valve and a tenth control valve are respectively provided on the first cleaning pipe and the second cleaning pipe, and a reverse osmosis flushing drain pipe is also provided on the reverse osmosis outlet pipe. An eleventh control valve is provided on the reverse osmosis flushing drain pipe, and the eleventh control valve is signal connected to the controller.

[0021] In one optional embodiment, a bag filter is installed on the raw water pipe, and pressure sensors are installed at both the inlet and outlet of the bag filter.

[0022] In one optional embodiment, the reverse osmosis inlet pipe is equipped with a precision filter, an antiscalant addition pipe, and a high-pressure pump. Pressure sensors are installed at both the inlet and outlet of the precision filter. The antiscalant addition pipe is located between the precision filter and the ultrafiltration water tank, and the high-pressure pump is located between the precision filter and the reverse osmosis filter.

[0023] Beneficial effects:

[0024] 1. By setting up backwash pipes, compressed air pipes, and backwash pumps, the ultrafiltration modules can be effectively cleaned, avoiding the problems of disassembling and manually cleaning the ultrafiltration modules, which would lead to long cleaning times and inconvenience. This helps to reduce cleaning time, improve cleaning efficiency, and avoid affecting production.

[0025] 2. Since the conductivity of RO water is generally high when the system is started, the RO water with high conductivity is usually discharged. By setting up a reverse osmosis circulation pipe, the RO water with high conductivity can be re-entered into the reverse osmosis filter for reverse osmosis, which can effectively avoid the waste of resources. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 is a schematic diagram of a dual-membrane water treatment system according to an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the ultrafiltration module during backwashing according to an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the reverse osmosis cleaning assembly according to an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Ultrafiltration Component; 101. Ultrafiltration Water Filter; 102. First Connection Port; 103. Second Connection Port; 104. Third Connection Port; 105. Fourth Connection Port; 2. Raw Water Pipe; 201. Raw Water Main Pipe; 202. Raw Water Branch Pipe; 3. Ultrafiltration Water Pipe; 301. Ultrafiltration Main Pipe; 302. Ultrafiltration Branch Pipe; 4. Ultrafiltration Water Tank; 5. Compressed Air Pipe; 501. Compressed Air Main Pipe; 502. Compressed Air Branch Pipe; 6. Backwash Pipe; 7. Backwash Drain Pipe; 701. Upper Drain Pipe; 702. Lower Drain Pipe; 8. Control Valve; 801. First Control Valve; 802. Second Control Valve; 803. Third Control Valve; 804. Fourth Control Valve; 805. Fifth Control Valve; 806. Sixth Control Valve; 807. Seventh Control Valve; 808. Eighth Control Valve; 809. Ninth Control Valve; 8010. Tenth Control Valve; 8011. Eleventh Control Valve; 9. Reverse Osmosis Filter; 10. Reverse Osmosis Inlet Pipe; 11. Reverse Osmosis Outlet Pipe; 12. RO Water Tank; 13. Reverse Osmosis Cleaning Components; 1301. Cleaning Buffer Tank; 1302. Cleaning Pump; 1303. First Cleaning Pipe; 1304. Second Cleaning Pipe; 1305. Cleaning Filter; 1306. Drain Outlet; 14. Reverse Osmosis Flushing Drain Pipe; 15. Bag Filter; 16. Pressure Sensor; 17. Precision Filter; 18. Antiscalant Addition Pipe; 19. High Pressure Pump; 20. Conductivity Meter; 21. Reverse Osmosis Circulation Pipe; 22. Backwash Pump. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] The embodiments of this utility model are described below with reference to Figures 1 to 3.

[0034] According to an embodiment of the present invention, a dual-membrane water treatment system is provided, comprising: an ultrafiltration component 1, a compressed air pipe 5, a backwash pipe 6, a backwash drain pipe 7, and a control device.

[0035] Specifically, the inlet of ultrafiltration component 1 is connected to the outlet of raw water pipe 2, the outlet of ultrafiltration component 1 is connected to the inlet of ultrafiltration water pipe 3, and the outlet of ultrafiltration water pipe 3 is connected to the inlet of ultrafiltration water tank 4. Compressed air pipe 5 is connected to the outlet of ultrafiltration component 1. The inlet of backwash pipe 6 is connected to the outlet of ultrafiltration water tank 4, and the outlet of backwash pipe 6 is connected to the outlet of ultrafiltration component 1. A backwash pump 22 is installed on backwash pipe 6. Backwash drain pipe 7 is connected to the inlet of ultrafiltration component 1. The control device includes a control valve 8 and a controller. The control valve 8 is signal-connected to the controller. The control valve 8 includes a first control valve 801 installed in the raw water pipe 2, a second control valve 802 installed in the ultrafiltration water pipe 3, a third control valve 803 installed in the compressed air pipe 5, a fourth control valve 804 installed in the backwash pipe 6, and a fifth control valve 805 installed in the backwash drain pipe 7. The controller is signal-connected to the backwash pump 22.

[0036] In this embodiment, the outlet and inlet of the raw water pipe 2 are connected to the ultrafiltration assembly 1 and the raw water tank, respectively. The raw water in the raw water tank enters the ultrafiltration assembly 1 through the raw water pipe 2 for ultrafiltration. The outlet and inlet of the ultrafiltration water pipe 3 are connected to the inlet of the ultrafiltration water tank 4 and the outlet of the ultrafiltration assembly 1, respectively. The water after ultrafiltration can enter the ultrafiltration water tank 4 through the ultrafiltration water pipe 3. The inlet and outlet of the backwash pipe 6 are connected to the outlet of the ultrafiltration water tank 4 and the outlet of the ultrafiltration assembly 1, respectively, and can remove water from the ultrafiltration water tank 4. The ultrafiltration module 1 is backwashed. The backwash drain pipe 7 is connected to the inlet of the ultrafiltration module 1. After backwashing, the water will be discharged from the entire system through the backwash drain pipe 7. The ultrafiltration module 1 is connected to the compressed air pipe 5. Before backwashing, compressed air in the compressed air pipe 5 can be connected to purge the ultrafiltration module 1. The controller (not shown) is connected to the control valve 8 and the backwash pump 22. The controller can filter the raw water and backwash the ultrafiltration module 1 by controlling the control valve 8 and the backwash pump 22.

[0037] When raw water needs to be filtered, the controller controls the third control valve 803, the fourth control valve 804, the fifth control valve 805 and the backwash pump 22 to close. The raw water in the raw water tank flows into the ultrafiltration component 1 through the raw water pipe 2 for ultrafiltration. The ultrafiltration water flows into the ultrafiltration water tank 4 through the ultrafiltration water pipe 3.

[0038] As shown in Figure 2, when the ultrafiltration module 1 needs to be cleaned, the controller closes the first control valve 801, the second control valve 802, and the fourth control valve 804, and opens the third control valve 803 and the fifth control valve 805, allowing compressed air from the compressed air pipe 5 to enter the ultrafiltration module 1 and purge the ultrafiltration membrane for air washing. Air washing removes particulate matter attached to the ultrafiltration membrane. After air washing, the compressed air carrying the particulate matter is discharged through the backwash drain pipe 7. After the air washing has been performed for a specified time, the controller opens the fourth control valve 804 and the backwash pump 1302, while keeping the third control valve 803 and the fifth control valve 805 open. The controller opens the backwash pump 1302, which draws water from the ultrafiltration water tank 4 into the backwash pipe 6, mixing the ultrafiltration water with compressed air to perform air-water mixed washing on the ultrafiltration module 1. The controller can control the output power of the backwash pump 1302 to ensure that the amount of compressed air mixed with ultrafiltration water is controlled at the set value. After the air-water washing is completed, the air and water will be discharged through the backwash drain pipe 7. After the air-water mixed washing has been performed for a specified time, the controller controls the third control valve 803 to close and controls the backwash pump 1302 to increase the flow rate of ultrafiltration water and increase the flow velocity of ultrafiltration water to perform backwashing on the ultrafiltration module 1. After the backwashing is completed, the ultrafiltration water will be discharged through the backwash drain pipe 7.

[0039] It should be noted that the times for air washing, air-water mixed washing, and backwashing are pre-programmed into the controller, and the times for these processes can be adjusted based on the usage time of the ultrafiltration unit 1. Preferably, the controller is a PLC controller.

[0040] By setting up a backwash pipe 6, a compressed air pipe 5, and a backwash pump 22, the cleaning of the ultrafiltration module 1 can be effectively achieved. This avoids the problem of disassembling and manually cleaning the ultrafiltration module 1, which would result in a long cleaning time and inconvenience. It helps to reduce cleaning time, improves cleaning efficiency, and avoids affecting production.

[0041] In one embodiment, the ultrafiltration assembly 1 includes a plurality of ultrafiltration water filters 101, each having a first connection port 102, a second connection port 103, a third connection port 104, and a fourth connection port 105. The raw water pipe 2 includes a main raw water pipe 201 and a plurality of branch raw water pipes 202, each branch pipe 202 corresponding to one of the ultrafiltration water filters 101. One end of each branch pipe 202 is connected to the outlet of the main raw water pipe 201, and the other end is connected to the first connection port 102. The backwash drain pipe 7 is connected to each of the branch pipes 202. The ultrafiltration water pipe 3 includes an ultrafiltration main pipe 301 and several ultrafiltration branch pipes 302. Each ultrafiltration branch pipe 302 corresponds to an ultrafiltration water filter 101. One end of each ultrafiltration branch pipe 302 is connected to the inlet end of the ultrafiltration main pipe 301, and the other end is connected to the second connection port 103. The backwash pipe 6 is connected to each of the ultrafiltration branch pipes 302. The compressed air pipe 5 includes a compressed air main pipe 501 and several compressed air branch pipes 502. Each compressed air branch pipe 502 corresponds to an ultrafiltration water filter 101. One end of each compressed air branch pipe 502 is connected to the ultrafiltration main pipe 301, and the other end is connected to the third connection port 104.

[0042] In this embodiment, as shown in Figures 1 and 2, the ultrafiltration assembly 1 includes several ultrafiltration water filters 101. The number of ultrafiltration water filters 101 can be increased or decreased according to process requirements, and is not specifically limited here. Each ultrafiltration water filter 101 contains an ultrafiltration membrane. The inlet end of the raw water main pipe 201 is connected to the raw water tank, and the outlet end of the raw water main pipe 201 is connected to several raw water branch pipes 202. The outlet end of the ultrafiltration main pipe 301 is connected to the ultrafiltration water tank 4, and the inlet end of the ultrafiltration main pipe 301 is connected to several ultrafiltration branch pipes 302. The backwash pipe 6 is connected to several ultrafiltration branch pipes 302 respectively. The outlet end of the compressed air main pipe 501 is connected to several compressed air branch pipes 502, and the inlet end of the compressed air main pipe 501 is connected to a compressed air output device.

[0043] During filtration, the raw water in the main raw water pipe 201 enters the ultrafiltration water filter 101 through the raw water branch pipe 202 and the first connection port 102. After the ultrafiltration membrane in the ultrafiltration water filter 101 ultrafilters the raw water, the ultrafiltered water enters the ultrafiltration branch pipe 302 through the second connection port 103, and then enters the ultrafiltration main pipe 301 along the ultrafiltration branch pipe 302 and flows into the ultrafiltration water tank 4.

[0044] During air washing, compressed air enters the ultrafiltration water filter 101 through the compressed air main pipe 501, the compressed air branch pipe 502 and the third connection port 104 in sequence. After air washing, the compressed air enters the raw water branch pipe 202 from the first connection port 102 and is discharged from the backwash drain pipe 7.

[0045] During air-water washing, compressed air enters the ultrafiltration water filter 101 sequentially through the compressed air main pipe 501, compressed air branch pipe 502, and third connection port 104. Ultrafiltration water enters the ultrafiltration water filter 101 sequentially through the backwash pipe 6, ultrafiltration branch pipe 302, and second connection port 103. After air-water washing is completed, the air and water will enter the raw water branch pipe 202 from the first connection port 102 and be discharged from the backwash drain pipe 7.

[0046] During backwashing, ultrafiltration water enters the ultrafiltration water filter 101 sequentially through the backwashing pipe 6, the ultrafiltration branch pipe 302, and the second connection port 103. After backwashing, the ultrafiltration water enters the raw water branch pipe 202 from the first connection port 102 and is discharged from the backwash drain pipe 7.

[0047] In one embodiment, the backwash drain pipe 7 includes an upper drain pipe 701 and a lower drain pipe 702. The upper drain pipe 701 is connected to several raw water branch pipes 202. A fifth control valve 805 is installed on the upper drain pipe 701. The lower drain pipe 702 is connected to a fourth connection port 105. The control valve 8 includes a sixth control valve 806 installed on the lower drain pipe 702.

[0048] In this embodiment, as shown in Figure 2, backwashing includes upper backwashing and lower backwashing. After the air-water washing is completed, upper backwashing begins. Ultrafiltration water enters the ultrafiltration water filter 101 sequentially through the backwashing pipe 6, the ultrafiltration branch pipe 302, and the second connection port 103. After the upper backwashing is completed, the ultrafiltration water enters the raw water branch pipe 202 from the first connection port 102 and is discharged from the upper drain pipe 701. Upper backwashing can wash one side of the ultrafiltration membrane. After the upper backwashing reaches the set time, lower backwashing begins. The controller closes the fifth control valve 805 and opens the sixth control valve 806. Ultrafiltration water enters the ultrafiltration water filter 101 sequentially through the backwashing pipe 6, the ultrafiltration branch pipe 302, and the second connection port 103. After the lower backwashing is completed, the ultrafiltration water enters the lower drain pipe 702 from the fourth connection port 105 and is discharged. Upper backwashing can wash the other side of the ultrafiltration membrane. Both sides of the ultrafiltration membrane can be washed through upper backwashing and lower backwashing respectively.

[0049] In one embodiment, the system further includes a reverse osmosis filter 9. The reverse osmosis filter 9 is connected to the outlet of the ultrafiltration water tank 4 via a reverse osmosis inlet pipe 10, and is connected to the inlet of the RO water tank 12 via a reverse osmosis outlet pipe 11.

[0050] In this embodiment, as shown in Figure 1, the ultrafiltration water in the ultrafiltration water tank 4 enters the reverse osmosis filter 9 through the reverse osmosis inlet pipe 10. After reverse osmosis filtration, RO water is obtained. The RO water enters the RO water tank 12 through the reverse osmosis outlet pipe 11 for storage.

[0051] In one embodiment, the system further includes a reverse osmosis circulation pipe 21. The inlet end of the reverse osmosis circulation pipe 21 is connected to the reverse osmosis outlet pipe 11, and the outlet end of the reverse osmosis circulation pipe 21 is connected to the reverse osmosis inlet pipe 10. A seventh control valve 807 is provided at the inlet of the RO water tank 12, and an eighth control valve 808 is provided on the reverse osmosis circulation pipe 21. The seventh control valve 807 and the eighth control valve 808 are connected to the controller signal.

[0052] In this embodiment, as shown in Figure 1, the inlet and outlet ends of the reverse osmosis circulation pipe 21 are connected to the reverse osmosis outlet pipe 11 and the reverse osmosis inlet pipe 10, respectively. Both the reverse osmosis inlet pipe 10 and the reverse osmosis outlet pipe 11 are equipped with conductivity meters 20. Both conductivity meters 20 are connected to the controller signal. The two conductivity meters 20 can detect the conductivity of the ultrafiltration water and the RO water, respectively, and transmit the detection data to the controller. If the conductivity of the RO water does not meet the set value, the controller can control the seventh control valve 807 to close and the eighth control valve 808 to open, preventing the RO water from entering the RO water tank 12. The RO water will then re-enter the reverse osmosis filter 9 through the reverse osmosis circulation pipe 21 for reverse osmosis filtration until the conductivity meters 20 detect that the RO water meets the set conductivity. At this point, the controller can control the seventh control valve 807 to open and the eighth control valve 808 to close, allowing the RO water to enter the RO water tank 12.

[0053] Specifically, a one-way valve is installed at the connection between the outlet end of the reverse osmosis circulation pipe 21 and the reverse osmosis inlet pipe 10.

[0054] Since the conductivity of RO water is generally high when the system is started, it is usually discharged. By setting up the reverse osmosis circulation pipe 21, the RO water with high conductivity can be re-entered into the reverse osmosis filter 9 for reverse osmosis, which can effectively avoid the waste of resources.

[0055] In one embodiment, the system further includes a reverse osmosis cleaning assembly 13. The reverse osmosis cleaning assembly 13 includes a cleaning buffer tank 1301, a cleaning pump 1302, a first cleaning pipe 1303, and a second cleaning pipe 1304. The cleaning buffer tank 1301 contains cleaning fluid and is connected to the cleaning pump 1302. The cleaning pump 1302 is connected to the reverse osmosis inlet pipe 10 through the first cleaning pipe 1303, and the cleaning buffer tank 1301 is connected to the reverse osmosis outlet pipe 11 through the second cleaning pipe 1304.

[0056] In this embodiment, as shown in Figures 1 and 3, cleaning agent is added to the cleaning buffer tank 1301. The cleaning pump 1302 is connected to the first cleaning pipe 1303 and the cleaning buffer tank 1301 respectively. The other end of the first cleaning pipe 1303 is connected to the reverse osmosis inlet pipe 10. The two ends of the second cleaning pipe 1304 are connected to the cleaning buffer tank 1301 and the reverse osmosis outlet pipe 11 respectively. The cleaning pump 1302 can transport the cleaning agent in the cleaning buffer tank 1301 to the reverse osmosis inlet pipe 10 through the first cleaning pipe 1303. The cleaning agent flows into the reverse osmosis filter 9 through the reverse osmosis inlet pipe 10 to clean the reverse osmosis filter 9. After cleaning, the cleaning agent can return to the cleaning buffer tank 1301 through the reverse osmosis inlet pipe 10 and the second cleaning pipe 1304 in sequence. When cleaning the reverse osmosis filter 9, the controller controls the seventh control valve 807 and the eighth control valve 808 to close.

[0057] In one embodiment, the permeation cleaning assembly further includes a cleaning filter 1305, which is connected to the cleaning pump 1302 and the first cleaning pipe 1303.

[0058] In this embodiment, as shown in FIG3, the cleaning agent that has finished cleaning the reverse osmosis filter 9 will carry a large number of impurities back to the cleaning buffer tank 1301. The cleaning pump 1302 will send the cleaning agent back into the reverse osmosis inlet pipe 10. The cleaning filter 1305 located between the cleaning pump 1302 and the first cleaning pipe 1303 can filter the impurities in the cleaning agent and prevent the impurities from flowing back into the reverse osmosis filter 9.

[0059] In one embodiment, a ninth control valve 809 and a tenth control valve 8010 are respectively provided on the first cleaning pipe 1303 and the second cleaning pipe 1304. A reverse osmosis flushing drain pipe 14 is also provided on the reverse osmosis outlet pipe 11. An eleventh control valve 8011 is provided on the reverse osmosis flushing drain pipe 14. The eleventh control valve 8011 is connected to the controller signal.

[0060] In this embodiment, as shown in Figures 1 and 3, the ninth control valve 809 and the tenth control valve 8010 are manual valves. After cleaning the reverse osmosis filter 9 for a specified time, the cleaning pump 1302 is turned off, and the reverse osmosis filter 9 is soaked in cleaning agent. After a period of time, the ninth control valve 809 and the tenth control valve 8010 are closed, and the controller controls the eleventh control valve 8011 to open, using ultrafiltration water to flush the reverse osmosis filter 9. The cleaning agent in the reverse osmosis filter 9 is flushed into the reverse osmosis flushing drain pipe 14 and discharged from the reverse osmosis flushing drain pipe 14 until the cleaning agent in the reverse osmosis filter 9 is completely flushed out. Then, the controller can close the eleventh control valve 8011 and open the seventh control valve 807 or the eighth control valve 808. In other embodiments, the ninth control valve 809 and the tenth control valve 8010 can be electric valves.

[0061] Specifically, the cleaning buffer tank 1301 has a drain outlet 1306. After cleaning, the cleaning agent in the cleaning buffer tank 1301 can be discharged through the drain outlet 1306.

[0062] In one embodiment, a bag filter 15 is installed on the raw water pipe 2, and pressure sensors 16 are installed at both the inlet and outlet of the bag filter 15.

[0063] In this embodiment, as shown in Figure 1, a bag filter 15 is installed on the raw water main pipe 201. The raw water in the raw water tank first passes through the bag filter 15 and then enters the ultrafiltration assembly 1. Pressure sensors 16 are installed at both the inlet and outlet of the bag filter 15. When the pressure difference between the inlet and outlet of the bag filter 15 is greater than the initial value of 0.1 MPa, the bag filter 15 needs to be cleaned or replaced.

[0064] In one embodiment, a precision filter 17, an antiscalant addition pipe 18, and a high-pressure pump 19 are provided on the reverse osmosis inlet pipe 10. Pressure sensors 16 are provided at both the inlet and outlet of the precision filter 17. The antiscalant addition pipe 18 is located between the precision filter 17 and the ultrafiltration water tank 4. The high-pressure pump 19 is located between the precision filter 17 and the reverse osmosis filter 9.

[0065] In this embodiment, as shown in Figure 1, a precision filter 17 is installed on the reverse osmosis inlet pipe 10. Ultrafiltration water passes through the precision filter 17 and then enters the reverse osmosis filter 9. Pressure sensors 16 are installed at both the inlet and outlet of the precision filter 17. The filter needs to be replaced when the pressure difference between the inlet and outlet of the precision filter 17 exceeds the initial value of 0.5 MPa. Ultrafiltration water still contains calcium and magnesium ions, which are prone to scaling. The scale inhibitor addition pipe 18 can add scale inhibitors to the ultrafiltration water, effectively preventing reverse osmosis scaling. The high-pressure pump 19 can apply a certain pressure to the ultrafiltration water, causing the reverse osmosis filter 9 to block dissolved ions in the water, such as sodium, chloride, and sulfate ions.

[0066] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A dual-membrane water treatment system, characterized in that, include: An ultrafiltration unit (1) is provided, the inlet of which is connected to the outlet of the raw water pipe (2), the outlet of which is connected to the inlet of the ultrafiltration water pipe (3), and the outlet of which is connected to the inlet of the ultrafiltration water tank (4); a compressed air pipe (5) is connected to the outlet of the ultrafiltration unit (1); a backwash pipe (6) is provided, the inlet of which is connected to the outlet of the ultrafiltration water tank (4), and the outlet of which is connected to the outlet of the ultrafiltration unit (1); a backwashing pipe (6) is provided, the inlet of which is connected to the outlet of the ultrafiltration water tank (4), and the outlet of which is connected to the outlet of the ultrafiltration unit (1); a backwashing pump (22) is provided on the backwashing pipe (6); and a backwashing drain pipe (7) is provided. The backwash drain pipe (7) is connected to the inlet of the ultrafiltration assembly (1); the control device includes a control valve (8) and a controller. The control valve (8) is signal-connected to the controller. The control valve (8) includes a first control valve (801) installed on the raw water pipe (2), a second control valve (802) installed on the ultrafiltration water pipe (3), a third control valve (803) installed on the compressed air pipe (5), a fourth control valve (804) installed on the backwash pipe (6), and a fifth control valve (805) installed on the backwash drain pipe (7). The controller is signal-connected to the backwash pump (22).

2. The dual-membrane water treatment system according to claim 1, characterized in that, The ultrafiltration assembly (1) includes several ultrafiltration water filters (101), each having a first connection port (102), a second connection port (103), a third connection port (104), and a fourth connection port (105); the raw water pipe (2) includes a main raw water pipe (201) and several branch raw water pipes (202), each branch raw water pipe (202) corresponding to one of the ultrafiltration water filters (101), one end of each branch raw water pipe (202) being connected to the outlet of the main raw water pipe (201), and the other end of each branch raw water pipe (202) being connected to the first connection port (102); the backwash drain pipe (7) is connected to several of the branch raw water pipes (202); the ultrafiltration water pipe (3) includes a main ultrafiltration pipe (301) and several The ultrafiltration branch pipe (302) corresponds one-to-one with the ultrafiltration water filter (101). One end of the ultrafiltration branch pipe (302) is connected to the water inlet end of the ultrafiltration main pipe (301), and the other end of the ultrafiltration branch pipe (302) is connected to the second connection port (103). The backwash pipe (6) is connected to several ultrafiltration branch pipes (302) respectively. The compressed air pipe (5) includes a compressed air main pipe (501) and several compressed air branch pipes (502). The compressed air branch pipes (502) correspond one-to-one with the ultrafiltration water filter (101). One end of the compressed air branch pipe (502) is connected to the ultrafiltration main pipe (301), and the other end of the compressed air branch pipe (502) is connected to the third connection port (104).

3. The dual-membrane water treatment system according to claim 2, characterized in that, The backwash drain pipe (7) includes an upper drain pipe (701) and a lower drain pipe (702). The upper drain pipe (701) is connected to several of the raw water branch pipes (202). The fifth control valve (805) is installed on the upper drain pipe (701). The lower drain pipe (702) is connected to the fourth connection port (105). The control valve (8) includes a sixth control valve (806) installed on the lower drain pipe (702).

4. The dual-membrane water treatment system according to any one of claims 1 to 3, characterized in that, Also includes: The reverse osmosis filter (9) is connected to the outlet of the ultrafiltration water tank (4) through the reverse osmosis inlet pipe (10) and the reverse osmosis filter (9) is connected to the inlet of the RO water tank (12) through the reverse osmosis outlet pipe (11).

5. The dual-membrane water treatment system according to claim 4, characterized in that, Also includes: A reverse osmosis circulation pipe (21) is provided, the inlet end of which is connected to the reverse osmosis outlet pipe (11), and the outlet end of which is connected to the reverse osmosis inlet pipe (10). A seventh control valve (807) is provided at the inlet of the RO water tank (12), and an eighth control valve (808) is provided on the reverse osmosis circulation pipe (21). The seventh control valve (807) and the eighth control valve (808) are connected to the controller signal.

6. The dual-membrane water treatment system according to claim 4, characterized in that, Also includes: A reverse osmosis cleaning assembly (13) includes a cleaning buffer tank (1301), a cleaning pump (1302), a first cleaning pipe (1303), and a second cleaning pipe (1304). The cleaning buffer tank (1301) contains cleaning fluid. The cleaning buffer tank (1301) is connected to the cleaning pump (1302). The cleaning pump (1302) is connected to the reverse osmosis inlet pipe (10) through the first cleaning pipe (1303). The cleaning buffer tank (1301) is connected to the reverse osmosis outlet pipe (11) through the second cleaning pipe (1304).

7. The dual-membrane water treatment system according to claim 6, characterized in that, The reverse osmosis cleaning assembly (13) further includes a cleaning filter (1305), which is connected to the cleaning pump (1302) and the first cleaning pipe (1303).

8. The dual-membrane water treatment system according to claim 6, characterized in that, The first cleaning pipe (1303) and the second cleaning pipe (1304) are respectively equipped with a ninth control valve (809) and a tenth control valve (8010). The reverse osmosis outlet pipe (11) is also equipped with a reverse osmosis flushing drain pipe (14). The reverse osmosis flushing drain pipe (14) is equipped with an eleventh control valve (8011). The eleventh control valve (8011) is connected to the controller signal.

9. The dual-membrane water treatment system according to any one of claims 5 to 8, characterized in that, A bag filter (15) is installed on the raw water pipe (2), and pressure sensors (16) are installed at both the inlet and outlet of the bag filter (15).

10. The dual-membrane water treatment system according to claim 9, characterized in that, The reverse osmosis inlet pipe (10) is equipped with a precision filter (17), an antiscalant addition pipe (18), and a high-pressure pump (19). The inlet and outlet of the precision filter (17) are equipped with pressure sensors (16). The antiscalant addition pipe (18) is located between the precision filter (17) and the ultrafiltration water tank (4). The high-pressure pump (19) is located between the precision filter (17) and the reverse osmosis filter (9).

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