Ultrafiltration reverse osmosis microorganism control system and method

Abstract

The invention discloses an ultrafiltration reverse osmosis microorganism control system and method, and belongs to the field of environment-friendly water treatment. A water outlet of the ultrafiltration water inlet tank is sequentially communicated with the ultrafiltration device and the reverse osmosis water inlet tank, the dosing device is communicated with the reverse osmosis water inlet tank and the main pipeline through a dosing pipeline I and a dosing pipeline II, and the reverse osmosis water inlet tank is communicated with a water inlet of the reverse osmosis device through the main pipeline; the inlet water total bacterial count analyzer and the SDI analyzer are respectively communicated with the main pipeline through a bypass I and a bypass II, the ultraviolet sterilization device is mounted on the main pipeline, a concentrated water outlet of the reverse osmosis device is communicated with the concentrated water total bacterial count analyzer through a pipeline III, and a concentrated water outlet of the reverse osmosis monitoring device is communicated with the pipeline III through a bypass IV; a concentrated water inlet of the reverse osmosis monitoring device is communicated with the third pipeline through a third bypass, a produced water outlet of the reverse osmosis monitoring device is communicated with the desalted water tank through a fifth bypass, and a produced water outlet of the reverse osmosis monitoring device is communicated with the fifth bypass. According to the invention, the breeding of microorganisms can be inhibited, and targeted microorganism control can be carried out.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental water treatment, and in particular relates to an ultrafiltration reverse osmosis microbial control system and method. Background Art

[0002] Reverse osmosis is a membrane separation process that drives the solvent out of the solution by applying pressure. This process is opposite to the direction of natural osmosis, hence the name. This technology is known for its advantages such as low pollution, high efficiency, simple equipment structure and small space occupation. It is widely used in many fields such as chemical industry, electricity, medicine, metallurgy, food processing and municipal engineering. To date, the research and innovation of reverse osmosis technology is still advancing.

[0003] During the operation of reverse osmosis membrane, it is easily affected by various forms of pollution, including colloid, chemical, particle and biological pollution. Therefore, ultrafiltration membrane is usually used as a pretreatment for reverse osmosis to deeply remove suspended solid particles, colloids, microorganisms and macromolecular organic matter in the treated liquid to prevent these pollutants from contaminating the reverse osmosis membrane.

[0004] Although suspended solid particles and microorganisms can be effectively retained by ultrafiltration membranes, biological contamination of reverse osmosis membranes is still difficult to avoid. Biological contamination specifically refers to the accumulation of living or dead microorganisms (such as bacteria, algae, fungi and their spores, spores and viruses, etc.) and their secreted substances on the membrane surface, which will lead to a series of serious problems such as increased pressure difference inside the system, reduced water production, increased cleaning requirements, irreversible damage to the membrane body, and frequent replacement of pre-filter elements. Biological contamination is common in reverse osmosis systems, and its treatment process is full of challenges. It has irreversible and complex characteristics and has become a major problem in the maintenance and operation of reverse osmosis systems.

[0005] The existing reverse osmosis system biological pollution control is mainly achieved through reverse osmosis water pretreatment, and the dosing method is mostly used, that is, adding fungicides during the water treatment process before reverse osmosis to kill the existing bacteria and algae in the water and inhibit the continued reproduction of bacteria and algae. Although this technology can effectively control the amount of microorganisms in the reverse osmosis water, it has many shortcomings: 1. The price of non-oxidizing fungicides is high, and the operating cost of the traditional dosing method is high; 2. Although the cost of oxidizing fungicides (such as sodium hypochlorite solution) is relatively low, it is necessary to set a reducing agent dosing point on the pipeline before the reverse osmosis membrane. By adding reducing agents, excessive sodium hypochlorite oxidation and damage to the reverse osmosis membrane are avoided. The system operation and maintenance are complicated, the dosing concentration is difficult to control, and the risk of reverse osmosis membrane damage is high; 3. The addition of fungicides increases the burden on the water body and causes water environment pollution; 4. Long-term addition of the same fungicide will cause some microorganisms to develop drug resistance, and the type of fungicide must be constantly changed to maintain the microbial control effect, which greatly increases the complexity and operation and maintenance cost of reverse osmosis water treatment; 5. It is impossible to quickly and accurately identify the growth of microorganisms in the system and the location of the growth. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of identifying and controlling microbial contamination in an ultrafiltration reverse osmosis system and to provide an ultrafiltration reverse osmosis microbial control system and method.

[0007] The present invention can inhibit the growth of microorganisms. When microorganisms rapidly multiply and enter an outbreak period, the location where the microorganisms grow can be identified at the first time, and targeted microorganism control can be carried out, and the system can be accurately dosed to reduce the ineffective addition of bactericidal agents.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] An ultrafiltration reverse osmosis microbial control system, comprising an ultrafiltration water inlet tank, an ultrafiltration device, a dosing device, a reverse osmosis water inlet tank, an inlet water bacteria count analyzer, an SDI analyzer, an ultraviolet sterilization device, a reverse osmosis device, a concentrated water bacteria count analyzer, a reverse osmosis monitoring device, a desalted water tank, and a control module;

[0010] The water outlet of the ultrafiltration water inlet tank is connected to the water inlet of the ultrafiltration device through pipeline 1, the water outlet of the ultrafiltration device is connected to the reverse osmosis water inlet tank through pipeline 2, and the reverse osmosis water inlet tank is connected to the water inlet of the reverse osmosis device through the main pipeline; the two dosing outlets of the dosing device are connected to the reverse osmosis water inlet tank and the main pipeline through dosing pipeline 1 and dosing pipeline 2 respectively; the total bacteria count analyzer and SDI analyzer of the inlet water are connected to the main pipeline through bypass 1 and bypass 2 respectively; the ultraviolet sterilization device is installed on the main pipeline; the concentrated water outlet of the reverse osmosis device is connected to the concentrated water total bacteria analyzer through pipeline 3;

[0011] The water inlet of the reverse osmosis monitoring device is connected to the pipeline three through the bypass three, the concentrated water outlet of the reverse osmosis monitoring device is connected to the pipeline three through the bypass four, and the connection point between the bypass four and the pipeline three and the connection point between the bypass three and the pipeline three are arranged front and back along the water outlet direction; the water output outlet of the reverse osmosis monitoring device is connected to the desalted water tank through the bypass five, and the water output outlet of the reverse osmosis device is connected to the bypass five through the bypass six;

[0012] The control module is respectively connected to the input signals of the inlet bacteria count analyzer, the SDI analyzer, and the concentrated water bacteria count analyzer. The control module performs calculations based on the input signals and outputs the calculation results to the dosing device and the ultraviolet sterilization device to control the start and stop of the dosing device and the ultraviolet sterilization device respectively.

[0013] Furthermore, the ultrafiltration membrane component of the ultrafiltration device is one of a column ultrafiltration membrane, a curtain ultrafiltration membrane, and a tubular ultrafiltration membrane, and the ultrafiltration membrane material is an organic and inorganic doped material, wherein the organic material skeleton is PVDF, the inorganic doping material is nanosilver, and the ultrafiltration membrane has a molecular weight cutoff of 10,000-100,000.

[0014] Furthermore, a pressure regulating valve is installed on the pipeline three, and the pressure regulating valve is located between the reverse osmosis device and the connection point between the bypass three and the pipeline three; and a water inlet switching valve is installed on the bypass three.

[0015] Further, the reverse osmosis device includes a multi-stage reverse osmosis pressure vessel, the head and tail of the multi-stage reverse osmosis pressure vessel are connected respectively through connecting pipelines, the main pipeline is installed with an inlet water temperature sensor, an inlet water conductivity sensor, a water delivery pump, a pipeline mixer, an ORP monitoring instrument, a booster pump and a membrane inlet pressure sensor, the connecting pipeline between the multi-stage reverse osmosis pressure vessels is installed with an inter-stage membrane inlet pressure sensor, and the pipeline three is installed with a membrane outlet pressure sensor; the connection point between the dosing pipeline two and the main pipeline is located between the inlet water conductivity sensor and the water delivery pump;

[0016] The water inlet temperature sensor, water inlet conductivity sensor, membrane inlet pressure sensor, inter-stage membrane inlet pressure sensor and membrane outlet pressure sensor are all connected to the control module signal; a diaphragm resistant to microbial contamination is installed in the reverse osmosis pressure vessel, and the separation cortex of the diaphragm resistant to microbial contamination is doped with graphene oxide material.

[0017] Furthermore, a dosing pump is installed on the second dosing pipeline.

[0018] Further, the reverse osmosis monitoring device includes at least one membrane tank, a monitoring component and an imaging component;

[0019] The membrane pool is divided into an upper membrane pool and a lower membrane pool by a membrane sheet resistant to microbial contamination. The upper membrane pool is provided with a water inlet, and the lower membrane pool is provided with a concentrated water outlet and a produced water outlet. A window made of transparent material is arranged in the middle of the upper membrane pool, and a monitoring component is composed of the membrane pool, the membrane sheet and the window. The imaging component is installed on the membrane pool, and the imaging component performs real-time imaging detection of the membrane sheet resistant to microbial contamination in the membrane pool through the window. A high-pressure pump is installed on the main pipe, and the high-pressure pump is located between the membrane inlet pressure sensor and the reverse osmosis device.

[0020] An ultrafiltration reverse osmosis microbial control method, the method comprising the following steps:

[0021] Step 1, setting the control module to collect the signal of the total bacteria count analyzer of the inlet water as X1, the signal of the total bacteria count analyzer of the concentrated water as X2, the signal of the SDI analyzer as X3, and the signal of the imaging component 33 as X4;

[0022] Step 2: When X3>5, first shut down the reverse osmosis device, water delivery pump, dosing pump and ultraviolet sterilization device, then drain the water in the reverse osmosis water inlet tank into the accident pool, and then clean the reverse osmosis water inlet tank to achieve production mode;

[0023] When X3<5, there are three situations:

[0024] ① If X1<50CFU / ml and X2 / X1<300%, turn off the UV sterilizer and dosing device;

[0025] ②If X1<50CFU / ml, and X2 / X1>300%, turn off the UV sterilizer, start the dosing device, and continuously or intermittently add non-oxidizing fungicide to the main pipeline. The inlet concentration during continuous addition must reach 1-10ppm; if it is added once a day during intermittent addition, the addition concentration is 2-20ppm, and the addition time is 2-6 hours; if it is added once every 2 days, the addition concentration is 4-20ppm, and each addition time is 2-12 hours; whether it is intermittent addition or continuous addition, it ends when situation ① is reached;

[0026] ③If X1>50CFU / ml, start the ultraviolet disinfection device and the dosing device to add non-oxidizing bactericide into the main pipeline; the dosage and method of addition are the same as those in situation ②;

[0027] Step 4: Monitor and identify through the imaging component of the reverse osmosis monitoring device to obtain a control module input value X4, where X4 is the ratio of the area of ​​the fluorescent color development area to the area of ​​the imaging area;

[0028] Step 5: When X4>0.5, add bacteria stripping agent to the reverse osmosis influent water at a concentration of 1-10ppm.

[0029] Further, in step 2, the reverse osmosis water inlet tank is cleaned to achieve production mode, specifically:

[0030] Fill the reverse osmosis water inlet tank 4 with cleaning water, adjust the pH to 5-8, then add 50-400ppm non-oxidizing bactericide, and drain the water in the reverse osmosis water inlet tank 4 after soaking for 2-12 hours. Use a high-pressure water gun to rinse the inner wall of the reverse osmosis water inlet tank 4, and drain the residual cleaning water after cleaning to reach the production mode.

[0031] Furthermore, the non-oxidizing fungicide added in step 2 and step 3 is one of chlorophenol, quaternary ammonium salt and organic amine.

[0032] Furthermore, in step 4, the bacterial exfoliation agent is 2,2-dibromo-3-nitrilopropionamide.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: the ultrafiltration reverse osmosis microbial control system of the present invention has good antibacterial properties and microbial growth identification properties, can inhibit the growth of microorganisms, and when microorganisms rapidly multiply and enter the outbreak period, the location of microbial growth can be identified at the first time, and targeted microbial control can be carried out, which can greatly reduce the growth of microorganisms. The method of the present invention can quickly identify the outbreak of microorganisms, perform antibacterial treatment in time, and reduce the amount of bactericides used. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the connection relationship of an ultrafiltration reverse osmosis microbial control system of the present invention;

[0035] Figure 2 It is a block diagram of the signal connection between the control module and the dosing device, the ultraviolet sterilization device and each analyzer;

[0036] Figure 3 is a schematic diagram of a reverse osmosis monitoring device;

[0037] Figure 4 It is a schematic diagram of the reverse osmosis device, the dosing device, and the reverse osmosis water inlet tank being connected by pipelines;

[0038] Figure 5 It is a flow chart of an ultrafiltration reverse osmosis microbial control method of the present invention;

[0039] Figure 6 It is a block diagram of the signal connection between each sensor and the control module.

[0040] The names and reference numerals of the components involved in the above drawings are as follows:

[0041] Ultrafiltration water inlet tank 1, ultrafiltration device 2, dosing device 3, reverse osmosis water inlet tank 4, inlet bacteria count analyzer 5, SDI analyzer 6, ultraviolet sterilization device 7, reverse osmosis device 8, concentrated water bacteria count analyzer 9, main pipeline 10, reverse osmosis monitoring device 11, desalted water tank 12, control module 13, membrane tank 14, pressure regulating valve 15, inlet switching valve 16, high-pressure pump 17, dosing pump 18, water delivery pump 19, pipeline mixer 20, ORP monitoring instrument 21, booster pump 22, inlet water temperature sensor 23, inlet water conductivity sensor 24, membrane inlet pressure sensor 25, inter-stage membrane inlet pressure sensor 26, membrane outlet pressure sensor 27, bypass three 28, pipeline three 29, bypass five 30, reverse osmosis pressure vessel 31, bypass four 32, imaging component 33, pipeline one 34, dosing pipeline one 35, dosing pipeline two 36, pipeline two 37, bypass six 38. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] Specific implementation method 1: Figure 1-Figure 6 As shown, this embodiment discloses an ultrafiltration reverse osmosis microbial control system, including an ultrafiltration water inlet tank 1, an ultrafiltration device 2, a dosing device 3, a reverse osmosis water inlet tank 4, an inlet water total bacteria analyzer 5, an SDI analyzer 6, an ultraviolet sterilization device 7, a reverse osmosis device 8, a concentrated water total bacteria analyzer 9, a reverse osmosis monitoring device 11, a desalted water tank 12, and a control module 13;

[0044] The water outlet of the ultrafiltration water inlet tank 1 is connected to the water inlet of the ultrafiltration device 2 through the pipeline 1 34, the water outlet of the ultrafiltration device 2 is connected to the reverse osmosis water inlet tank 4 through the pipeline 2 37, and the reverse osmosis water inlet tank 4 is connected to the water inlet of the reverse osmosis device 8 through the main pipeline 10; the two dosing outlets of the dosing device 3 are respectively connected to the reverse osmosis water inlet tank 4 and the main pipeline 10 through the dosing pipeline 1 35 and the dosing pipeline 2 36; the total bacteria count analyzer 5 and the SDI analyzer 6 are respectively connected to the main pipeline 10 through the bypass 1 and the bypass 2; the ultraviolet disinfection device 7 is installed on the main pipeline 10; the concentrated water outlet of the reverse osmosis device 8 is connected to the concentrated water total bacteria count analyzer 9 through the pipeline 3 29; the dosing pipeline 2 36 is equipped with a dosing pump 18;

[0045] The water inlet of the reverse osmosis monitoring device 11 is connected to the pipeline 3 29 through the bypass 3 28, and the concentrated water outlet of the reverse osmosis monitoring device 11 is connected to the pipeline 3 29 through the bypass 4 32, and the connection point between the bypass 4 32 and the pipeline 3 29 and the connection point between the bypass 3 28 and the pipeline 3 29 are arranged front and back along the water outlet direction; the water outlet of the reverse osmosis monitoring device 11 is connected to the desalted water tank 12 through the bypass 5 30, and the water outlet of the reverse osmosis device 8 is connected to the bypass 5 30 through the bypass 6 38;

[0046] The control module 13 is connected to the input signals of the inlet bacteria count analyzer 5, the SDI analyzer 6, and the concentrated water bacteria count analyzer 9 respectively. The control module 13 performs calculations based on the input signals and outputs the calculation results to the dosing device 3 and the ultraviolet sterilization device 7 to control the start and stop of the dosing device 3 and the ultraviolet sterilization device 7 respectively.

[0047] The reverse osmosis water inlet tank 4 includes a cavity, the inner surface of the cavity is provided with a bacteria-resistant coating, the top wall of the cavity is provided with an inspection hole and a vent, and a respirator (purchased part) is installed in the cavity. The reverse osmosis water inlet tank 4 is based on the existing structure, and a bacteria-resistant coating is added to the inner wall of the reverse osmosis water inlet tank 4 to inhibit the growth of microorganisms.

[0048] The ultraviolet dose of the ultraviolet sterilization device 7 is 30-50 mJ / cm2, and the ultraviolet sterilization device 7 is a low-pressure mercury lamp or an LED ultraviolet lamp.

[0049] All pipelines are made of sanitary stainless steel.

[0050] Furthermore, the ultrafiltration membrane component of the ultrafiltration device 2 is one of a column ultrafiltration membrane, a curtain ultrafiltration membrane, and a tubular ultrafiltration membrane, and the ultrafiltration membrane material is an organic and inorganic doped material, wherein the organic material skeleton is PVDF, and the inorganic doping material is nanosilver, which has an antibacterial effect and plays a synergistic role with other antibacterial links, and the ultrafiltration membrane has a molecular weight cutoff of 10000-100000.

[0051] The other structures of the ultrafiltration device 2 are prior art, and only a certain number of ultrafiltration membrane components and corresponding water pumps need to be configured according to the amount of water.

[0052] Furthermore, a pressure regulating valve 15 is installed on the pipeline three 29 , and the pressure regulating valve 15 is located between the reverse osmosis device 8 and the connection point between the bypass three 28 and the pipeline three 29 ; and a water inlet switching valve 16 is installed on the bypass three 28 .

[0053] Furthermore, the reverse osmosis device 8 includes a multi-stage reverse osmosis pressure vessel 31 (a reverse osmosis pressure vessel is equipped with a reverse osmosis membrane assembly, which is a prior art), the head and tail of the multi-stage reverse osmosis pressure vessel 31 are connected by connecting pipelines, and the main pipeline 10 is installed with an inlet water temperature sensor 23, an inlet water conductivity sensor 24, a water delivery pump 19, a pipeline mixer 20, an ORP monitoring instrument 21, a booster pump 22 and a membrane inlet pressure sensor 25, and the connecting pipelines between the multi-stage reverse osmosis pressure vessels 31 are installed with an inter-stage membrane inlet pressure sensor 26, and the pipeline 29 is installed with a membrane outlet pressure sensor 27; if a two-stage reverse osmosis pressure vessel is used, the main pipeline 10 is installed with a water inlet temperature sensor 23, a water inlet ... main pipeline 10 is installed with a water inlet temperature sensor 23, a water inlet conductivity sensor 24, a water delivery pump 19, a pipeline mixer 20, an ORP monitoring instrument 21, a booster pump 22 and a membrane inlet pressure sensor 25, and the main pipeline 10 is 0, a first membrane inlet pressure sensor is installed near the water inlet of the second-stage reverse osmosis pressure vessel, an inter-stage membrane inlet pressure sensor 26 is installed on the connecting pipeline between the two-stage reverse osmosis pressure vessels, and a second-stage membrane outlet pressure sensor is installed on the pipeline 3 29 connected to the concentrated water outlet of the second-stage reverse osmosis pressure vessel; the connection point of the dosing pipeline 2 36 and the main pipeline 10 is located between the inlet water conductivity sensor 24 and the water delivery pump 19; the inlet water temperature sensor 23, the inlet water conductivity sensor 24, the water delivery pump 19, the pipeline mixer 20, the ORP monitoring instrument 21, the booster pump 22 and the membrane inlet pressure sensor 25 are all arranged between the reverse osmosis water inlet tank 4 and the ultraviolet sterilization device 7;

[0054] The inlet water temperature sensor 23, the inlet water conductivity sensor 24, the membrane inlet pressure sensor 25, the inter-stage membrane inlet pressure sensor 26 and the membrane outlet pressure sensor 27 are all connected to the control module 13 by signal, and are displayed and warned through the control module 13; a diaphragm resistant to microbial contamination is installed in the reverse osmosis pressure vessel 31, and the separation cortex of the diaphragm resistant to microbial contamination is doped with graphene oxide material, and the diaphragm resistant to microbial contamination is a prior art.

[0055] Further, the reverse osmosis monitoring device 11 (a flat membrane testing device) includes at least one membrane pool 14, a monitoring component and an imaging component 33;

[0056] like Figure 3As shown, the membrane pool 14 is divided into an upper membrane pool and a lower membrane pool by a membrane sheet resistant to microbial contamination. The upper membrane pool is provided with a water inlet, and the lower membrane pool is provided with a concentrated water outlet and a produced water outlet. A window made of transparent material is arranged in the middle of the upper membrane pool. The membrane pool, the membrane sheet and the window constitute a monitoring component. Through fluorescent color development, the changes of the membrane surface of the membrane sheet resistant to microbial contamination after water enters are observed, and the color development indicates that microorganisms grow and deposit on the membrane surface; the imaging component 33 is installed on the membrane pool 14, and the imaging component 33 performs real-time imaging detection on the membrane sheet resistant to microbial contamination in the membrane pool 14 through the window; the imaging component 33 includes a fluorescent microscope and a CCD camera, and the fluorescent microscope is installed in front of the lens of the CCD camera; a high-pressure pump 17 is installed on the main pipeline 10, and the high-pressure pump 17 is located between the membrane inlet pressure sensor 25 and the reverse osmosis device 8.

[0057] Specific implementation method 2: Figure 1-Figure 6 As shown, this embodiment discloses an ultrafiltration reverse osmosis microbial control method, which is implemented based on the control system of the specific embodiment 1, and includes the following steps:

[0058] Step 1, setting the control module 13 to collect the signal of the inlet water bacteria count analyzer 5 as X1, the signal of the concentrated water bacteria count analyzer 9 as X2, the signal of the SDI analyzer 6 as X3, and the signal of the imaging component 33 as X4;

[0059] Step 2: When X3>5, first shut down the reverse osmosis device 8, the water delivery pump 19, the dosing pump 18 and the ultraviolet sterilization device 7, then drain the water in the reverse osmosis water inlet tank 4 into the accident water pool, and then clean the reverse osmosis water inlet tank 4 to achieve production mode;

[0060] When X3<5, there are three situations:

[0061] ① If X1<50CFU / ml and X2 / X1<300%, turn off the ultraviolet sterilization device 7 and the dosing device 3;

[0062] ②If X1<50CFU / ml, and X2 / X1>300%, then turn off the ultraviolet disinfection device 7, start the dosing device 3, and continuously or intermittently add non-oxidizing fungicide to the main pipe 10. The inlet water concentration during continuous addition should reach 1-10ppm; if it is added once a day during intermittent addition, the addition concentration is 2-20ppm, and the addition time is 2-6 hours; if it is added once every 2 days, the addition concentration is 4-20ppm, and each addition time is 2-12 hours; whether it is intermittent addition or continuous addition, it ends when reaching situation ①; the focus of situation ② is to inhibit the continuous proliferation and reproduction of microorganisms on the membrane surface;

[0063] ③ If X1>50CFU / ml, start the ultraviolet disinfection device 7 to further inhibit waterborne microorganisms, start the dosing device 3, and add non-oxidizing bactericide to the main line 10; the dosage and method of addition are the same as those in case ②; the focus of case ③ is to inhibit the microorganisms in the raw water, make them inactive, and prevent them from depositing and growing on the membrane surface;

[0064] Step 4: Monitor and identify through the imaging component 33 of the reverse osmosis monitoring device 11, and obtain the input value X4 of the control module 13, where X4 is the ratio of the area of ​​the fluorescent coloring area to the area of ​​the imaging area;

[0065] Step 5: When X4>0.5, water is fed to the reverse osmosis (i.e., Figure 4 Bacteria stripping agent is added into the main pipe 10 shown in the figure, and the added concentration is 1-10ppm.

[0066] Furthermore, in step 2, the reverse osmosis water inlet tank 4 is cleaned to achieve production mode, specifically:

[0067] Fill the reverse osmosis water inlet tank 4 with cleaning water, adjust the pH to 5-8, then add 50-400ppm non-oxidizing bactericide, and drain the water in the reverse osmosis water inlet tank 4 after soaking for 2-12 hours. Use a high-pressure water gun to rinse the inner wall of the reverse osmosis water inlet tank 4, and drain the residual cleaning water after cleaning to reach the production mode.

[0068] Furthermore, the non-oxidizing fungicide added in step 2 and step 3 is one of chlorophenol, quaternary ammonium salt and organic amine.

[0069] Furthermore, in step 4, the bacterial exfoliation agent is 2,2-dibromo-3-nitrilopropionamide.

[0070] Embodiment 1:

[0071] The control module 13 receives the signal X1 from the inlet bacteria count analyzer 5, the signal X2 from the concentrated water bacteria count analyzer 9, the signal X3 from the SDI analyzer 6, and the signal X4 from the imaging component 3, and they are X1=10CFU / ml, X2=20CFU / ml, X3=3, and X4=0.05 respectively; that is, when X3<5, and X1<50CFU / ml, and X2 / X1<300%, it indicates that the current microbial contamination tendency is low, and the ultraviolet sterilization device 7 and the dosing device 3 are turned off, as well as the dosing pump 18 for adding the bacteria stripping agent.

[0072] The control module 13 receives a signal X3=10 from the SDI analyzer 6; that is, X3>5, indicating that the reverse osmosis water inlet tank 4 is currently contaminated by microorganisms. The control module 13 receives a signal X4 from the imaging component 3, X4=0.1, X4<0.5, indicating that the internal contamination of the reverse osmosis membrane assembly of the reverse osmosis device 8 is relatively mild, and there is no need to add a bacterial stripping agent to treat the reverse osmosis membrane assembly. Start the reverse osmosis water inlet tank 4 cleaning procedure, first shut down the reverse osmosis device 8, the water delivery pump 19, the dosing pump 18 and the ultraviolet sterilization device 7, drain the water in the reverse osmosis water inlet tank 4 into the accident pool, and then fill the reverse osmosis water inlet tank 4 with cleaning water. The cleaning water uses softened water with a pH of 6.5, and no acid-base adjustment is required. 200ppm of 2,2-dibromo-3-nitrilopropionamide is added. After soaking for 6 hours, the reverse osmosis water inlet tank 4 is emptied, and the inner wall of the reverse osmosis water inlet tank 4 is rinsed with a high-pressure water gun. The residual cleaning water after cleaning is emptied and the production mode is restored. After resuming production, the control module 13 receives the signal X1 from the inlet bacteria count analyzer 5, the signal X2 from the concentrated water bacteria count analyzer 9, and the signal X3 from the SDI analyzer 6, which are X1=15CFU / ml, X2=25CFU / ml, and X3=4, respectively, indicating that the current microbial contamination tendency is low, and the ultraviolet sterilization device 7 and the dosing device 3 are turned off.

[0073] Embodiment 2:

[0074] The control module 13 receives the signal X1 from the inlet bacteria count analyzer 5, the signal X2 from the concentrated water bacteria count analyzer 9, the signal X3 from the SDI analyzer 6, and the imaging component signal X4, and they are respectively X1=40CFU / ml, X2=710CFU / ml, X3=2, and X4=0.65; that is, X3<5, and X1<50CFU / ml, X2 / X1>300%, indicating that microorganisms are currently growing in large numbers in the reverse osmosis membrane assembly, and the ultraviolet sterilization device 7 is turned off, and the dosing device 3 is started, and 2ppm of the compound non-oxidizing bactericide and 5ppm of the bacterial stripping agent are continuously added.

[0075] Embodiment 3:

[0076] The control module 13 receives the signal X1 from the inlet bacteria count analyzer 5, the signal X2 from the concentrated water bacteria count analyzer 9, the signal X3 from the SDI analyzer 6, and the imaging component signal X4, and they are X1=100CFU / ml, X2=250CFU / ml, X3=4, and X4=0.4 respectively; that is, X3<5, and X1>50CFU / ml, indicating that there is a tendency of microbial growth at present, and the ultraviolet disinfection device 7 is started, the dosing device 3 is started, and the bactericide is intermittently added, once every two days, each time for 4 hours, and the dosage is 10ppm.

[0077] By using the device and method of the present invention, during the one-year operation period, the ultraviolet disinfection device 7 was not turned on for about 1500 hours, and no bactericide was added, which greatly saved the system energy consumption and the amount of bactericide added. Through the early warning of microbial growth, ultraviolet disinfection and drug addition were used to inhibit microbial growth in a timely manner. No shutdown maintenance due to microbial growth occurred throughout the year, and the entire ultrafiltration reverse osmosis microbial control system was in good operation.

[0078] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms of assembly without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0079] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An ultrafiltration reverse osmosis microbial control system, characterized in that: It comprises an ultrafiltration water inlet tank (1), an ultrafiltration device (2), a dosing device (3), a reverse osmosis water inlet tank (4), an inlet water bacteria count analyzer (5), an SDI analyzer (6), an ultraviolet sterilization device (7), a reverse osmosis device (8), a concentrated water bacteria count analyzer (9), a reverse osmosis monitoring device (11), a desalted water tank (12), and a control module (13); The water outlet of the ultrafiltration water inlet tank (1) is connected to the water inlet of the ultrafiltration device (2) through a pipeline 1 (34), the water outlet of the ultrafiltration device (2) is connected to the reverse osmosis water inlet tank (4) through a pipeline 2 (37), and the reverse osmosis water inlet tank (4) is connected to the water inlet of the reverse osmosis device (8) through a main pipeline (10); the two dosing outlets of the dosing device (3) are respectively connected to the reverse osmosis water inlet tank (4) and the main pipeline (10) through a dosing pipeline 1 (35) and a dosing pipeline 2 (36); the total bacteria count analyzer (5) and the SDI analyzer (6) are respectively connected to the main pipeline (10) through a bypass 1 and a bypass 2; the ultraviolet sterilization device (7) is installed on the main pipeline (10); the concentrated water outlet of the reverse osmosis device (8) is connected to the concentrated water total bacteria count analyzer (9) through a pipeline 3 (29); The water inlet of the reverse osmosis monitoring device (11) is connected to the pipeline three (29) through the bypass three (28), and the concentrated water outlet of the reverse osmosis monitoring device (11) is connected to the pipeline three (29) through the bypass four (32), and the connection point between the bypass four (32) and the pipeline three (29) and the connection point between the bypass three (28) and the pipeline three (29) are arranged front and back along the water outlet direction; the water output outlet of the reverse osmosis monitoring device (11) is connected to the desalted water tank (12) through the bypass five (30), and the water output outlet of the reverse osmosis device (8) is connected to the bypass five (30) through the bypass six (38); The control module (13) is respectively connected to the input signals of the inlet bacteria count analyzer (5), the SDI analyzer (6), and the concentrated water bacteria count analyzer (9); the control module (13) performs calculations based on the input signals, and outputs the calculation results to the dosing device (3) and the ultraviolet sterilization device (7), thereby controlling the start and stop of the dosing device (3) and the ultraviolet sterilization device (7).

2. An ultrafiltration reverse osmosis treatment system according to claim 1, characterized in that: The ultrafiltration membrane assembly of the ultrafiltration device (2) is one of a column ultrafiltration membrane, a curtain ultrafiltration membrane, and a tubular ultrafiltration membrane. The ultrafiltration membrane material is an organic and inorganic doped material, wherein the organic material skeleton is PVDF, the inorganic doped material is nanosilver, and the ultrafiltration membrane has a molecular weight cutoff of 10,000-100,000.

3. The ultrafiltration reverse osmosis treatment system according to claim 1, characterized in that: A pressure regulating valve (15) is installed on the pipeline three (29), and the pressure regulating valve (15) is located between the reverse osmosis device (8) and the connection point between the bypass three (28) and the pipeline three (29); and a water inlet switching valve (16) is installed on the bypass three (28).

4. An ultrafiltration reverse osmosis treatment system according to claim 3, characterized in that: The reverse osmosis device (8) comprises a multi-stage reverse osmosis pressure vessel (31), the head and tail of the multi-stage reverse osmosis pressure vessel (31) are connected respectively via connecting pipelines, the main pipeline (10) is equipped with an inlet water temperature sensor (23), an inlet water conductivity sensor (24), a water delivery pump (19), a pipeline mixer (20), an ORP monitoring instrument (21), a booster pump (22) and a membrane inlet pressure sensor (25), the connecting pipelines between the multi-stage reverse osmosis pressure vessels (31) are equipped with an inter-stage membrane inlet pressure sensor (26), and the pipeline three (29) is equipped with a membrane outlet pressure sensor (27); the connection point between the dosing pipeline two (36) and the main pipeline (10) is located between the inlet water conductivity sensor (24) and the water delivery pump (19); The water inlet temperature sensor (23), the water inlet conductivity sensor (24), the membrane inlet pressure sensor (25), the inter-stage membrane inlet pressure sensor (26) and the membrane outlet pressure sensor (27) are all connected to the control module (13) by signal; a membrane resistant to microbial contamination is installed in the reverse osmosis pressure vessel (31), and the separation cortex of the membrane resistant to microbial contamination is doped with graphene oxide material.

5. The ultrafiltration reverse osmosis microbial control system according to claim 4, characterized in that: A dosing pump (18) is installed on the second dosing pipeline (36).

6. An ultrafiltration reverse osmosis treatment system according to claim 5, characterized in that: The reverse osmosis monitoring device (11) comprises at least one membrane tank (14), a monitoring component and an imaging component (33); The membrane pool (14) is divided into an upper membrane pool and a lower membrane pool by a membrane sheet resistant to microbial contamination. The upper membrane pool is provided with a water inlet, and the lower membrane pool is provided with a concentrated water outlet and a produced water outlet. A window made of a transparent material is provided in the middle of the upper membrane pool. The monitoring component is composed of the membrane pool, the membrane sheet and the window. The imaging component (33) is installed on the membrane pool (14), and the imaging component (33) performs real-time imaging detection of the membrane sheet resistant to microbial contamination in the membrane pool (14) through the window. A high-pressure pump (17) is installed on the main pipeline (10), and the high-pressure pump (17) is located between the membrane inlet pressure sensor (25) and the reverse osmosis device (8).

7. An ultrafiltration reverse osmosis microbial control method, characterized in that: The method is implemented based on the control system described in any one of claims 4 to 6, and the method comprises the following steps: Step 1, setting the control module (13) to collect the signal of the inlet water bacteria count analyzer (5) as X1, the signal of the concentrated water bacteria count analyzer (9) as X2, the signal of the SDI analyzer (6) as X3, and the signal of the imaging component (33) as X4; Step 2: When X3>5, first shut down the reverse osmosis device (8), the water delivery pump (19), the dosing pump (18) and the ultraviolet sterilization device (7), then drain the water in the reverse osmosis water inlet tank (4) into the accident water pool, and then clean the reverse osmosis water inlet tank (4) to achieve production mode; When X3<5, there are three situations: ① If X1<50CFU / ml and X2 / X1<300%, turn off the ultraviolet sterilization device (7) and the dosing device (3); ② If X1<50CFU / ml, and X2 / X1>300%, then turn off the ultraviolet disinfection device (7), start the dosing device (3), and continuously or intermittently add non-oxidizing fungicide to the main pipe (10). The inlet water concentration during continuous addition should reach 1-10ppm; if the intermittent addition is once a day, the addition concentration is 2-20ppm, and the addition time is 2-6 hours; if the addition is once every 2 days, the addition concentration is 4-20ppm, and each addition time is 2-12 hours; whether intermittent addition or continuous addition is selected, the process ends when situation ① is reached; ③ If X1>50CFU / ml, the ultraviolet sterilization device (7) and the dosing device (3) are started to add non-oxidizing bactericide into the main line (10); the dosage and method of addition are the same as those in case ②; Step 4: Monitor and identify through the imaging component (33) of the reverse osmosis monitoring device (11), and obtain the input value X4 of the control module (13), where X4 is the ratio of the area of ​​the fluorescent color development area to the area of ​​the imaging area; Step 5: When X4>0.5, add bacteria stripping agent to the reverse osmosis influent water at a concentration of 1-10ppm.

8. The method for controlling ultrafiltration reverse osmosis microorganisms according to claim 7, characterized in that: In step 2, the reverse osmosis water inlet tank (4) is cleaned to achieve production mode, specifically: Fill the reverse osmosis water inlet tank 4 with cleaning water, adjust the pH to 5-8, then add 50-400ppm non-oxidizing bactericide, and drain the water in the reverse osmosis water inlet tank 4 after soaking for 2-12 hours. Use a high-pressure water gun to rinse the inner wall of the reverse osmosis water inlet tank 4, and drain the residual cleaning water after cleaning to reach the production mode.

9. The method for controlling ultrafiltration reverse osmosis microorganisms according to claim 7 or 8, characterized in that: The non-oxidizing bactericide added in step 2 and step 3 is one of chlorophenol, quaternary ammonium salt and organic amine.

10. The method for controlling ultrafiltration reverse osmosis microorganisms according to claim 7, characterized in that: In step 4, the bacterial exfoliation agent is 2,2-dibromo-3-nitrilopropionamide.

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