Online automatic cleaning device for ultrafiltration membrane group
By employing a combination of forward washing, backwashing, and air/water backwashing methods using an online automatic cleaning device, the problems of impurity deposition and chloride ion oxidation in ultrafiltration membrane modules were solved, achieving efficient cleaning and long-term stable operation of the membrane modules.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU BEICHEN ELECTROMECHANICAL EQUIP CO LTD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-05-12
AI Technical Summary
In pure water systems, the transmembrane pressure difference of ultrafiltration membrane modules increases due to impurity deposition during use, requiring frequent cleaning to maintain water production capacity. Furthermore, chloride ions in the filtered water can oxidize the RO membrane, affecting its service life.
Design an online automatic cleaning device for ultrafiltration membrane modules. The device uses a combination of forward washing, backwashing, and air/water backwashing to automatically clean the ultrafiltration membrane modules when the system is stopped. Chloride ions are removed by a dechlorination component. The device includes an inlet pipe, a drain pipe, a backwash inlet pipe, an air inlet pipe, and a control module. It uses compressed air and clean water for intermittent air blowing and cleaning.
It effectively removes pollutants from the membrane module, maintains water production capacity, extends the service life of the membrane module, and prevents chloride ions from oxidizing the RO membrane, ensuring long-term reliable operation of the system.
Smart Images
Figure CN224221116U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of filtration and cleaning technology, and in particular to an online automatic cleaning device for ultrafiltration membrane modules. Background Technology
[0002] In a pure water system, when an ultrafiltration membrane module is filtering water, impurities such as colloids, suspended solids, and large organic molecules in the feed water are trapped on the membrane surface. Over time, the thickness of the impurity layer on the membrane surface increases, increasing the flow resistance and causing the transmembrane pressure difference to rise. When the transmembrane pressure difference rises to a certain level, the fiber membrane needs to be cleaned to prevent excessive deposition of pollutants and maintain the normal water production capacity of the fiber membrane. During the filtration process, the membrane surface will be subject to various degrees of fouling, therefore the membrane module needs to be cleaned.
[0003] Therefore, in order to solve the above problems, it is urgent to design an online automatic cleaning device for ultrafiltration membrane modules, which can automatically clean the ultrafiltration membrane modules online when the pure water system is stopped, efficiently washing out the pollutants deposited in the ultrafiltration membrane modules; at the same time, it can effectively remove chloride ions from the filtered water, avoid chloride ions oxidizing the RO membrane, damaging the membrane structure, maintain the normal water production capacity of the ultrafiltration membrane modules, and extend their service life. Utility Model Content
[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:
[0005] An online automatic cleaning device for ultrafiltration membrane modules is characterized in that it includes an ultrafiltration membrane module, one end of which is provided with a water inlet and a sewage outlet, and the other end is provided with a concentrate outlet and a filtered water outlet.
[0006] The inlet is equipped with an inlet pipe connected to a clean water source, and an inlet pump and an inlet valve are installed on the inlet pipe;
[0007] A sewage pipe is installed on the sewage outlet, and a backwash discharge valve is installed on the sewage pipe;
[0008] The filtered water outlet is equipped with a filtered water outlet pipe and a backwash inlet pipe. The filtered water outlet pipe is equipped with an outlet valve and a dechlorination component for removing chloride ions from the filtered water.
[0009] The other end of the backwash inlet pipe is connected to the inlet pipe at a point between the inlet valve and the inlet pump. A backwash valve is installed on the backwash inlet pipe.
[0010] The concentrated water outlet is equipped with a concentrated water outlet pipe, and the concentrated water outlet pipe is equipped with a concentrated water drain valve. The connection point between the other end of the concentrated water outlet pipe and the drain pipe is located at the end of the backwash valve away from the drain outlet.
[0011] It also includes an air inlet pipe connected to a compressed air source. The connection point between the other end of the air inlet pipe and the drain pipe is located at the end of the backwash valve near the drain port. An air inlet valve is installed on the air inlet pipe.
[0012] Preferably, it also includes a control module, under the control of the control module, the air intake valve can be intermittently opened and closed, so that compressed air in the compressed air source is intermittently blown into the ultrafiltration membrane module through the air intake pipe.
[0013] Preferably, the dechlorination assembly includes a dosing pipe, a dosing pump, and an oxidant tank;
[0014] The connection point between the dosing pipe and the filtered water outlet pipe is located at the end of the outlet valve away from the filtered water outlet, and the other end of the dosing pipe is connected to the oxidant tank.
[0015] Preferably, the dosing pump is a pulse pump.
[0016] Preferably, the pressure of the compressed air source is 0.15-0.25 MPa, and the pressure of the clean water inlet is 0.25-0.4 MPa.
[0017] Preferably, the inlet valve, backwash discharge valve, filtered water outlet valve, backwash valve, concentrated water drain valve, and air inlet valve are solenoid valves.
[0018] Preferably, the water inlet pipe, air inlet pipe, and backwash water inlet pipe are equipped with one-way valves.
[0019] Preferably, a pressure gauge is installed on the water inlet pipe, and the water inlet pump is a variable frequency pump.
[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0021] 1. This utility model can automatically clean the ultrafiltration membrane module online when the pure water system is stopped. It uses a combination of forward washing, back washing and air and water back washing to efficiently wash out the pollutants deposited in the ultrafiltration membrane module, avoid excessive deposition and contamination of pollutants in the ultrafiltration membrane module, maintain the normal water production capacity of the ultrafiltration membrane module, and extend its service life.
[0022] 2. By setting up the dechlorination component, chlorine ions in the filtered water are removed, preventing chlorine ions from oxidizing the RO membrane and damaging the membrane structure, thus ensuring the long-term reliable use of the ultrafiltration membrane module. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of this utility model;
[0024] The components include: 1. Ultrafiltration membrane module; 2. Clean water source; 3. Inlet pump; 4. Inlet valve; 5. Backwash discharge valve; 6. Outlet valve; 7. Dechlorination assembly; 8. Backwash valve; 9. Concentrate drain valve.
[0025] Water inlet 11, drain outlet 12, concentrated water outlet 13, filtered water outlet 14, dosing pipe 71, dosing pump 72, oxidant tank 73, water inlet pipe 10, drain pipe 20, filtered water outlet pipe 30, concentrated water outlet pipe 40, air inlet pipe 50, backwash water inlet pipe 60, compressed air source 100, air inlet valve 200, check valve 400, pressure gauge 500. Detailed Implementation
[0026] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.
[0027] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," "up," "down," "front," "back," and similar expressions used in this document are for illustrative purposes only.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0029] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:
[0030] like Figure 1 As shown, an online automatic cleaning device for an ultrafiltration membrane module 1 includes an ultrafiltration membrane module 1. One end of the ultrafiltration membrane module 1 is provided with an inlet 11 and a drain 12, and the other end is provided with a concentrate outlet 13 and a filtered water outlet 14.
[0031] The inlet 11 is provided with an inlet pipe 10 connected to the clean water source 2, and the inlet pipe 10 is provided with an inlet pump 3 and an inlet valve 4.
[0032] The drain outlet 12 is equipped with a drain pipe 20, and the drain pipe 20 is equipped with a backwash discharge valve 5.
[0033] The filtered water outlet 14 is provided with a filtered water outlet pipe 30 and a backwash inlet pipe 60. The filtered water outlet pipe 30 is provided with an outlet valve 6 and a dechlorination component 7 for removing chloride ions from the filtered water.
[0034] The connection point between the other end of the backwash inlet pipe 60 and the inlet pipe 10 is located between the inlet valve 4 and the inlet pump 3. A backwash valve 8 is provided on the backwash inlet pipe 60.
[0035] A concentrated water outlet 13 is provided with a concentrated water outlet pipe 40, and a concentrated water drain valve 9 is provided on the concentrated water outlet pipe 40. The connection point between the other end of the concentrated water outlet pipe 40 and the drain pipe 20 is located at the end of the backwash valve 8 away from the drain outlet 12.
[0036] It also includes an air inlet pipe 50 connected to the compressed air source 100. The connection point between the other end of the air inlet pipe 50 and the drain pipe 20 is located at the end of the backwash valve 8 near the drain port 12. An air inlet valve 200 is provided on the air inlet pipe 50.
[0037] Working principle: When the pure water system stops, the online cleaning of ultrafiltration membrane module 1 is initiated, and the cleaning is performed according to the following steps:
[0038] Step 1 (Forward Wash): Open the concentrate drain valve 9 and the inlet valve 4, and close the backwash drain valve 5, outlet valve 6, backwash valve 8, and air inlet valve 200. The clean water source 2 enters the ultrafiltration membrane module 1 through the inlet pipe 10 and the inlet 11. The clean water passes through the outside of the fiber filter membrane at a certain flow rate, causing the washed-out contaminants to be discharged from the concentrate outlet 13 through the concentrate outlet pipe 40 and the drain pipe 20 in sequence. This operation has no filtration effect; its purpose is to remove residual material in the ultrafiltration membrane module 1 with clean water. The cleaning time depends on the specific situation.
[0039] Step 2 (Backwash): After forward washing is completed, backwashing begins. This operation is the reverse of the filtration process. At this time, backwash discharge valve 5 and backwash valve 8 are opened, while concentrate drain valve 9, inlet valve 4, outlet valve 6, and air inlet valve 200 are closed. Clean water enters the ultrafiltration membrane module 1 from the filter water outlet 14 through the backwash inlet pipe 60. Under a certain pressure, clean water (tap water or membrane filtered water) permeates from the raw water side (filter water outlet 14) to the feed liquid side (inlet 11). Contaminants on the feed liquid side and blockages that have penetrated into the micropores of the filter membrane are washed out through the drain outlet 12 and drain pipe 20. In actual operation, the backwash frequency and intensity can be determined by monitoring parameters such as transmembrane pressure difference, cumulative working time, and membrane flux.
[0040] Step 3 (Air and Water Backwash): After backwashing, the process switches to air scrubbing. At this time, the air inlet valve 200 and the concentrate drain valve 9 are opened, while the backwash discharge valve 5, backwash valve 8, water inlet valve 4, and water outlet valve 6 are closed. By controlling the air inlet valve 200 to open and close at a certain frequency, a pulse air source is formed. The pulse air source enters the ultrafiltration membrane module 1 through the inlet pipe 50 and the drain pipe 20 from the drain port 12. After passing through the hollow fiber membrane, it is discharged from the concentrate outlet 13. During the process, the hollow fiber membrane inside will swing due to the rising airflow, achieving mutual friction and collision, thereby causing the pollutants attached to the surface of the hollow fiber membrane to peel off. After the air scrubbing is completed, the process automatically switches to backwashing. The pollutants peeled off inside are washed out from the drain port 12 through backwashing. During the process, air scrubbing and water backwashing can be carried out together or alternately according to the cleaning requirements. Thus, the cleaning is completed after the above-mentioned forward washing, backwashing, and air and water backwashing operations.
[0041] The above structure can automatically clean the ultrafiltration membrane module 1 online when the pure water system is shut down. It uses a combination of forward washing, backwashing, and air and water backwashing to efficiently wash out the pollutants deposited in the ultrafiltration membrane module 1, thereby avoiding excessive deposition and contamination of pollutants in the ultrafiltration membrane module 1, maintaining the normal water production capacity of the ultrafiltration membrane module 1, and extending its service life. At the same time, the dechlorination component 7 effectively removes chlorine ions from the filtered water, preventing chlorine ions from oxidizing the RO membrane and damaging the membrane structure, and ensuring the long-term reliable use of the ultrafiltration membrane module 1.
[0042] Furthermore, such as Figure 1 As shown, it also includes a control module (not shown in the figure). Under the control of the control module, the air intake valve 200 can be intermittently opened and closed, so that the compressed air in the compressed air source 100 is intermittently blown into the ultrafiltration membrane module 1 through the air intake pipe 50.
[0043] In this embodiment, the interval between the intermittent on / off air blowing is set as follows: the air inlet valve 200 pulses at a frequency of 3 seconds of air intake and 2 seconds of pause. After the air inlet valve 200 completes one or more pulses, the cleaning device switches from air scrubbing to backwashing, or air scrubbing and backwashing alternate continuously according to the set number of times; thus, the contaminants on the fiber membrane can be effectively peeled off and washed out.
[0044] In this embodiment, the inlet valve 4, backwash discharge valve 5, filtered water outlet valve 6, backwash valve 8, concentrated water drain valve 9, air inlet valve 200, inlet pump 3, and dechlorination assembly 7 are electrically connected to the control module, thereby realizing automatic control of forward washing, backwashing, and air and water backwashing according to the built-in control program of the control module.
[0045] Furthermore, such as Figure 1 As shown, the dechlorination assembly 7 includes a dosing pipe 71, a dosing pump 72, and an oxidant tank 73;
[0046] The connection point between the dosing pipe 71 and the filtered water outlet pipe 30 is located at the end of the outlet valve 6 away from the filtered water outlet 14, and the other end of the dosing pipe 71 is connected to the oxidant tank 73.
[0047] In this embodiment, the oxidant is pumped to the filtered water outlet pipe 30 by the dosing pump 72, thereby removing chloride ions from the filtered water and preventing chloride ions from oxidizing the RO membrane and damaging the membrane structure.
[0048] Furthermore, such as Figure 1 As shown, in order to achieve precise and continuous delivery of the reagent and improve the dechlorination effect, the dosing pump 72 is a pulse pump.
[0049] Furthermore, such as Figure 1 As shown, in order to achieve efficient removal of pollutants while avoiding damage to the internal fiber membrane, the pressure of the compressed air source 100 is 0.15-0.25 MPa, and the pressure of the clean water inlet is 0.25-0.4 MPa.
[0050] Furthermore, the inlet valve 4, backwash discharge valve 5, filtered water outlet valve 6, backwash valve 8, concentrated water drain valve 9, and air inlet valve 200 are solenoid valves.
[0051] In this embodiment, the efficiency and safety of the cleaning device are improved by the automation, precision and high reliability of the solenoid valve;
[0052] Furthermore, such as Figure 1 As shown, in order to avoid backflow in the pipes and cause equipment damage, and to improve cleaning efficiency and safety, the water inlet pipe 10, air inlet pipe 50 and backwash water inlet pipe 60 are equipped with one-way valves 400.
[0053] Furthermore, in order to effectively maintain a stable water pressure for the clean water entering the inlet pipe 10 and improve the reliability of cleaning, a pressure gauge 500 is installed on the inlet pipe 10, and the inlet pump 3 is a variable frequency pump.
[0054] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this utility model patent.
Claims
1. An online automatic cleaning device for ultrafiltration membrane modules, characterized in that, It includes an ultrafiltration membrane module, with an inlet and a drain at one end and a concentrate outlet and a filtered water outlet at the other end. The inlet is equipped with an inlet pipe connected to a clean water source, and an inlet pump and an inlet valve are installed on the inlet pipe; A sewage pipe is installed on the sewage outlet, and a backwash discharge valve is installed on the sewage pipe; The filtered water outlet is equipped with a filtered water outlet pipe and a backwash inlet pipe. The filtered water outlet pipe is equipped with an outlet valve and a dechlorination component for removing chloride ions from the filtered water. The other end of the backwash inlet pipe is connected to the inlet pipe at a point between the inlet valve and the inlet pump. A backwash valve is installed on the backwash inlet pipe. The concentrated water outlet is equipped with a concentrated water outlet pipe, and the concentrated water outlet pipe is equipped with a concentrated water drain valve. The connection point between the other end of the concentrated water outlet pipe and the drain pipe is located at the end of the backwash valve away from the drain outlet. It also includes an air inlet pipe connected to a compressed air source. The connection point between the other end of the air inlet pipe and the drain pipe is located at the end of the backwash valve near the drain port. An air inlet valve is installed on the air inlet pipe.
2. The online automatic cleaning device for an ultrafiltration membrane module according to claim 1, characterized in that, It also includes a control module. Under the control of the control module, the air intake valve can be intermittently opened and closed, so that compressed air in the compressed air source can be intermittently blown into the ultrafiltration membrane module through the air intake pipe.
3. The online automatic cleaning device for an ultrafiltration membrane module according to claim 1, characterized in that, The dechlorination assembly includes a dosing pipe, a dosing pump, and an oxidant tank; The connection point between the dosing pipe and the filtered water outlet pipe is located at the end of the outlet valve away from the filtered water outlet, and the other end of the dosing pipe is connected to the oxidant tank.
4. The online automatic cleaning device for an ultrafiltration membrane module according to claim 3, characterized in that, The dosing pump is a pulse pump.
5. The online automatic cleaning device for an ultrafiltration membrane module according to claim 1, characterized in that, The pressure of the compressed air source is 0.15-0.25 MPa, and the pressure of the clean water inlet is 0.25-0.4 MPa.
6. The online automatic cleaning device for an ultrafiltration membrane module according to claim 1, characterized in that, The inlet valve, backwash discharge valve, filtered water outlet valve, backwash valve, concentrated water drain valve, and air inlet valve are all solenoid valves.
7. The online automatic cleaning device for an ultrafiltration membrane module according to claim 1, characterized in that, The water inlet pipe, air inlet pipe, and backwash water inlet pipe are equipped with one-way valves.
8. The online automatic cleaning device for an ultrafiltration membrane module according to claim 1, characterized in that, A pressure gauge is installed on the water inlet pipe, and the water inlet pump is a variable frequency pump.