Immersed ultrafiltration membrane physicochemical cleaning device

Abstract

The utility model discloses an immersed ultrafiltration membrane physicochemical cleaning device, which relates to the technical field of ultrafiltration and comprises a membrane tank, membrane filaments, a water producing tank, a water producing pump, a gas washing mechanism, a physical cleaning mechanism and a chemical agent cleaning mechanism. The other end of the water inlet pipe is communicated with the interior of the membrane wire so as to input water in the water producing tank into the membrane wire to perform back flushing on the membrane wire; the output end of the gas washing mechanism is communicated with the membrane pool so as to convey gas into the membrane pool to carry out gas washing on the membrane filaments; the chemical agent cleaning mechanism comprises a cleaning tank, a chemical cleaning valve, an agent conveying pipe, a chemical cleaning pump, an agent circulating pipeline and a circulating valve, the chemical cleaning valve and the chemical cleaning pump are arranged on the agent conveying pipe, one end of the agent circulating pipeline is communicated with the membrane pool, the other end of the agent circulating pipeline is communicated with the agent conveying pipe, and the circulating valve is arranged on the agent circulating pipeline; the ultrafiltration membrane cleaning device is simple in structure and convenient to use, and can effectively clean the ultrafiltration membrane so as to recover the filtering capacity and the water production performance of the ultrafiltration membrane.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ultrafiltration, particularly to an immersed ultrafiltration membrane physicochemical cleaning device. BACKGROUND

[0002] Ultrafiltration is a membrane separation technology that can purify and separate solutions. The ultrafiltration membrane system is a solution separation device that uses ultrafiltration membrane filaments as the filtration medium and the pressure difference between the two sides of the membrane as the driving force. The ultrafiltration membrane only allows the solvent (such as water molecules), inorganic salts, and small-molecule organic matter in the solution to pass through, while retaining large-molecule substances such as suspended solids, colloids, proteins, and microorganisms in the solution, thereby achieving the purpose of purification and separation. The ultrafiltration membrane is immersed in the membrane tank, and the water production pump is connected to the membrane tank outlet pipe to create a vacuum inside the membrane. Under the push of atmospheric pressure, water in the membrane tank continuously enters the membrane, and finally, water is produced from the outlet pipe. Large particles of pollutants are retained by the micropores on the membrane surface and remain in the membrane tank.

[0003] After a period of operation, the membrane will be contaminated, which is manifested as follows: ① The membrane surface is contaminated and aggregated, resulting in concentration polarization, and the membrane flux decreases; ② The micropores on the membrane surface are blocked, the pressure drop increases, and the transmembrane pressure difference increases. Therefore, it is necessary to clean the ultrafiltration membrane to restore its filtration capacity and water production performance. UTILITY MODEL CONTENT

[0004] The utility model aims to provide an immersed ultrafiltration membrane physicochemical cleaning device to solve the problems existing in the prior art, which is simple in structure, easy to use, effectively cleans the ultrafiltration membrane, and restores its filtration capacity and water production performance.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0006] The utility model provides a kind of immersed ultrafiltration membrane physical and chemical cleaning device, comprising: membrane pool, membrane silk, water production pool, water production pump, gas washing mechanism, physical cleaning mechanism and chemical cleaning mechanism, one end of the membrane pool is communicated with inlet pipe, water inlet valve is provided on the inlet pipe, the other end of the membrane pool is communicated with outlet pipe, water outlet valve is provided on the outlet pipe, the bottom of the membrane pool is communicated with drain pipe, vent valve is provided on the drain pipe;The membrane silk is arranged in the membrane pool, and the inside of the membrane silk is communicated with the one end of the outlet pipe that extends into the membrane pool;The water production pool is communicated with the one end of the outlet pipe that is away from the membrane pool;The water production pump is arranged on the outlet pipe between the water outlet valve and the water production pool;One end of the physical cleaning mechanism is communicated with the water production pool, and the other end is communicated with the inside of the membrane silk to input water in the water production pool into the membrane silk to reverse flush the membrane silk;The output end of the gas washing mechanism is communicated with the membrane pool to deliver gas into the membrane pool to gas wash the membrane silk;The chemical cleaning mechanism includes cleaning tank, chemical cleaning valve, reagent delivery pipe, chemical cleaning pump, reagent circulation pipeline and circulation valve, the cleaning tank is used to configure cleaning reagent, one end of the reagent delivery pipe is communicated with the cleaning tank, and the other end is communicated with the inside of the membrane silk, the chemical cleaning valve and the chemical cleaning pump are both arranged on the reagent delivery pipe, the chemical cleaning valve is arranged at the position close to the cleaning tank, the chemical cleaning pump is arranged at the position close to the membrane silk, one end of the reagent circulation pipeline is communicated with the membrane pool, and the other end is communicated with the reagent delivery pipe between the chemical cleaning valve and the chemical cleaning pump, the circulation valve is arranged on the reagent circulation pipeline.

[0007] Preferably, it further includes a first medicine box, a second medicine box and a third medicine box, the first medicine box is used for placing sodium hypochlorite, and the first medicine box is communicated with the cleaning tank to add sodium hypochlorite into the cleaning tank, the second medicine box is used for placing sodium hydroxide, and the second medicine box is communicated with the cleaning tank to add sodium hydroxide into the cleaning tank, and the third medicine box is used for placing citric acid, and the third medicine box is communicated with the cleaning tank to add citric acid into the cleaning tank.

[0008] Preferably, it further includes a water delivery pipeline, a medicine dispensing valve and a medicine dispensing pump, one end of the water delivery pipeline is communicated with the cleaning tank, and the other end is communicated with the water production pool, and the medicine dispensing valve and the medicine dispensing pump are arranged on the water delivery pipeline.

[0009] Preferably, the physical cleaning mechanism includes a physical cleaning pipeline, a physical cleaning valve and a physical cleaning pump, one end of the physical cleaning pipeline is communicated with the water production pool, and the other end is communicated with the outlet pipe between the water outlet valve and the membrane silk.

[0010] Preferably, the air washing mechanism comprises a blower, an air inlet pipeline and an air inlet valve, one end of the air inlet pipeline is communicated with the blower, and the other end is communicated with the membrane pool.

[0011] The utility model discloses relative to prior art has obtained following technical effect:

[0012] The utility model discloses a kind of immersed ultrafiltration membrane physical and chemical cleaning device, the setting of water inlet pipe, water inlet valve, water outlet pipe, water outlet valve can control the normal water inlet and water outlet of ultrafiltration membrane system;Drain pipe and vent valve facilitate sewage discharge in cleaning process.The physical cleaning mechanism can utilize the water in water production pool to carry out reverse flushing to membrane filament, and some adhering pollutants inside and on membrane filament can be effectively removed;Air washing mechanism sends gas to membrane pool, shakes membrane filament, and it is helpful to loosen the pollutants on the surface of membrane filament;Chemical agent cleaning mechanism realizes the delivery of prepared reagent to membrane filament, to carry out depth chemical cleaning.The design of reagent circulation pipeline and circulation valve can make reagent circulate between membrane pool and cleaning tank, and enhance chemical cleaning effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiments, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0014] Figure 1 The structure diagram of the immersed ultrafiltration membrane physical and chemical cleaning device provided by the utility model is shown.

[0015] In the drawing: 1, membrane pool;2, membrane filament;3, water inlet pipe;4, water inlet valve;5, water outlet pipe;6, water outlet valve;7, drain pipe;8, vent valve;9, water production pool;10, water production pump;11, cleaning tank;12, chemical cleaning valve;13, reagent delivery pipe;14, chemical cleaning pump;15, reagent circulation pipeline;16, circulation valve;17, first reagent tank;18, second reagent tank;19, third reagent tank;20, water delivery pipeline;21, reagent preparation valve;22, reagent preparation pump;23, physical cleaning pipeline;24, physical cleaning valve;25, physical cleaning pump;26, blower;27, air inlet pipeline;28, air inlet valve. DETAILED DESCRIPTION

[0016] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of the utility model protection.

[0017] The utility model aims at providing a kind of immersion type ultrafiltration membrane physical and chemical cleaning device, to solve the problems existing in the prior art described above, simple structure, convenient to use, effectively clean ultrafiltration membrane, to restore its filtering capacity and water production performance.

[0018] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model is further described in detail below with reference to the drawings and specific embodiments.

[0019] The utility model provides a kind of immersion type ultrafiltration membrane physical and chemical cleaning device, such as Figure 1The device comprises a membrane pool 1, a membrane filament 2, a water production pool 9, a water production pump 10, a gas washing mechanism, a physical washing mechanism, and a chemical agent washing mechanism. One end of the membrane pool 1 is connected with a water inlet pipe 3, and the water inlet pipe 3 is provided with a water inlet valve 4. The other end of the membrane pool 1 is connected with a water outlet pipe 5, and the water outlet pipe 5 is provided with a water outlet valve 6. The bottom of the membrane pool 1 is connected with a discharge pipe 7, and the discharge pipe 7 is provided with a vent valve 8. The membrane filament 2 is arranged in the membrane pool 1, and the inner side of the membrane filament 2 is connected with the end of the water outlet pipe 5 extending into the membrane pool 1. The water production pool 9 is connected with the end of the water outlet pipe 5 away from the membrane pool 1. The water production pump 10 is arranged on the water outlet pipe 5 between the water outlet valve 6 and the water production pool 9. One end of the physical washing mechanism is connected with the water production pool 9, and the other end is connected with the inside of the membrane filament 2 to input the water in the water production pool 9 into the membrane filament 2 to perform reverse flushing on the membrane filament 2. The output end of the gas washing mechanism is connected with the membrane pool 1 to deliver gas into the membrane pool 1 to perform gas washing on the membrane filament 2. The chemical agent washing mechanism comprises a washing tank 11, a chemical washing valve 12, a chemical agent delivery pipe 13, a chemical washing pump 14, a chemical agent circulation pipeline 15, and a circulation valve 16. The washing tank 11 is used for configuring washing liquid. One end of the chemical agent delivery pipe 13 is connected with the washing tank 11, and the other end is connected with the inside of the membrane filament 2. The chemical washing valve 12 and the chemical washing pump 14 are both arranged on the chemical agent delivery pipe 13. The chemical washing valve 12 is arranged close to the washing tank 11, and the chemical washing pump 14 is arranged close to the membrane filament 2. One end of the chemical agent circulation pipeline 15 is connected with the membrane pool 1, and the other end is connected with the chemical agent delivery pipe 13 between the chemical washing valve 12 and the chemical washing pump 14. The circulation valve 16 is arranged on the chemical agent circulation pipeline 15, thereby constructing a complete immersed ultrafiltration membrane physical and chemical washing device. The water inlet pipe 3, the water inlet valve 4, the water outlet pipe 5, and the water outlet valve 6 can control the normal water inlet and water outlet of the ultrafiltration membrane system. The discharge pipe 7 and the vent valve 8 facilitate the discharge of sewage during the washing process. The physical washing mechanism can perform reverse flushing on the membrane filament 2 by using the water in the water production pool 9, thereby effectively removing some unfirmly-attached pollutants inside and on the surface of the membrane filament 2. The gas washing mechanism delivers gas into the membrane pool 1 to shake the membrane filament 2, thereby helping to loosen the pollutants on the surface of the membrane filament 2. The chemical agent washing mechanism realizes the delivery of the prepared chemical agent into the membrane filament 2, thereby performing deep chemical washing. The design of the chemical agent circulation pipeline 15 and the circulation valve 16 can make the chemical agent circulate between the membrane pool 1 and the washing tank 11, thereby enhancing the chemical washing effect.

[0020] In a preferred embodiment, the first tank 17 is used to store sodium hypochlorite, and the first tank 17 is in communication with the cleaning tank 11 to add sodium hypochlorite into the cleaning tank 11; the second tank 18 is used to store sodium hydroxide, and the second tank 18 is in communication with the cleaning tank 11 to add sodium hydroxide into the cleaning tank 11; and the third tank 19 is used to store citric acid, and the third tank 19 is in communication with the cleaning tank 11 to add citric acid into the cleaning tank 11. The three separate tanks are used to store sodium hypochlorite, sodium hydroxide and citric acid, respectively, so that the required chemicals can be conveniently and accurately provided for different chemical cleaning processes. Sodium hypochlorite and sodium hydroxide are used for alkaline cleaning, which can effectively remove organic contaminants on the membrane surface; citric acid is used for acid cleaning, which can remove inorganic contaminants on the membrane surface. The communication design of the tanks and the cleaning tank 11 is conducive to quickly and conveniently adding chemicals into the cleaning tank 11 for liquid preparation, thereby improving the convenience and efficiency of chemical cleaning operation.

[0021] In a preferred embodiment, the water conveying pipeline 20, the dosing valve 21 and the dosing pump 22 are further included. One end of the water conveying pipeline 20 is in communication with the cleaning tank 11, and the other end is in communication with the water production tank 9. The dosing valve 21 and the dosing pump 22 are arranged on the water conveying pipeline 20. The combination of the water conveying pipeline 20, the dosing valve 21 and the dosing pump 22 can conveniently take water from the water production tank 9 to the cleaning tank 11 to provide a water source for preparing cleaning liquid. By controlling the opening degree of the dosing valve 21 and the operation of the dosing pump 22, the amount of water added to the cleaning tank 11 can be accurately controlled, so that cleaning liquid with different concentrations can be more accurately prepared, which helps to adjust the concentration of the cleaning liquid according to the actual pollution condition of the ultrafiltration membrane, thereby improving the cleaning effect.

[0022] In a preferred embodiment, the physical cleaning mechanism includes a physical cleaning pipeline 23, a physical cleaning valve 24 and a physical cleaning pump 25. One end of the physical cleaning pipeline 23 is in communication with the water production tank 9, and the other end is in communication with the water outlet pipeline 5 between the water outlet valve 6 and the membrane wire 2. The physical cleaning pipeline 23 serves as a water conveying passage to ensure the communication of water flow between the water production tank 9 and the membrane wire 2. The physical cleaning valve 24 can accurately control the opening and closing of physical cleaning, so that the cleaning operation can be conveniently performed according to the need. The physical cleaning pump 25 provides power for the cleaning water, so that the water in the water production tank 9 can enter the membrane wire 2 at a suitable pressure for reverse flushing, effectively removing some impurities inside and on the surface of the membrane wire 2, and restoring part of the performance of the membrane.

[0023] In a preferred embodiment, the air washing mechanism comprises a blower 26, an air inlet pipe 27 and an air inlet valve 28, one end of the air inlet pipe 27 is communicated with the blower 26, and the other end is communicated with the membrane tank 1, a continuous and stable air source is provided by the blower 26, and the air inlet pipe 27 ensures that the gas can be smoothly delivered to the membrane tank 1. The air inlet valve 28 can flexibly control the entering amount and time of the gas, and in the cleaning process, the required amount of gas is introduced into the membrane tank 1, so that the gas contacts the membrane filaments 2 in the membrane tank 1, can effectively shake the membrane filaments 2, and makes the pollutants on the surface of the membrane filaments 2 fall off, thereby assisting the physical cleaning and chemical cleaning, and improving the cleaning efficiency and quality.

[0024] The application also provides an immersed ultrafiltration membrane physical and chemical cleaning device according to any one of the above, comprising the following steps:

[0025] 1. Normal ultrafiltration working stage

[0026] The water inlet valve 4 and the water outlet valve 6 are opened, and the air release valve 8, the physical cleaning valve 24, the chemical cleaning valve 12, the air inlet valve 28, the circulation valve 16 and the dosing valve 21 are closed. The raw water enters the membrane tank 1 through the water inlet pipe 3, and under the action of the ultrafiltration membrane, the clean water enters the water outlet pipe 5 through the inside of the membrane filaments 2 and is delivered to the water production tank 9 for subsequent use by the water production pump 10. At this time, the device is in a normal ultrafiltration working state, and the raw water is purified.

[0027] 2. Physical cleaning stage

[0028] 2.1. Preparation stage: the water inlet valve 4 is closed, and when the liquid level of the membrane tank 1 drops to the same level as the membrane assembly, the water outlet valve 6 is closed, and the filtration mode is stopped to prepare for physical cleaning.

[0029] 2.2. Air washing and reverse flushing stage:

[0030] The blower 26 is started, and the air inlet valve 28 is opened. Air is introduced into the membrane tank 1 through the air inlet pipe 27 to shake the membrane filaments 2 by air flow. At the same time, the physical cleaning pump 25 is started, and the physical cleaning valve 24 is opened. The water in the water production tank 9 is introduced into the inside of the membrane filaments 2 through the physical cleaning pipe 23 and the water outlet pipe 5 under the action of the physical cleaning pump 25, and diffuses from the membrane filaments 2 to the membrane tank 1, and carries away the pollutants on the membrane surface in the diffusion process. The air-water washing lasts for 10 minutes.

[0031] Air-water flushing flow and time control: assuming that the rated flow of the physical cleaning pump 25 is (m 3 / h), and the air-water flushing setting time is (h), then the cleaning water volume entering the membrane system in the air-water flushing stage is. By reasonably setting the parameters, the flushing effect is ensured.

[0032] 2.3. Discharge stage: the air release valve 8 is opened, and the sewage containing pollutants in the membrane tank 1 is discharged into the drainage channel through the discharge pipe 7, and the physical cleaning is completed.

[0033] 3. Chemical cleaning stage

[0034] 3.1. Alkaline cleaning process

[0035] Preparation: Close the water inlet valve 4 and the water outlet valve 6, and open the vent valve 8 to drain the water in the membrane tank 1.

[0036] Chemical solution preparation: Open the dispensing pump 22 and the dispensing valve 21 on the water conveying pipeline 20, take water from the water production tank 9 to the cleaning tank 11; open the communication channels between the first chemical tank 17 (sodium hypochlorite), the second chemical tank 18 (sodium hydroxide) and the cleaning tank 11 respectively, and add appropriate amount of sodium hypochlorite and sodium hydroxide into the cleaning tank 11 to prepare the alkaline cleaning solution in the cleaning tank 11, so that the pH value of the solution reaches 12.

[0037] 3.2. Soaking and air washing: Open the chemical cleaning pump 14 and the chemical cleaning valve 12, and pour the prepared alkaline cleaning solution into the membrane filament 2 through the chemical conveying pipe 13, and then discharge it into the membrane tank 1 through the flow channel of the membrane filament 2. When the solution in the membrane tank 1 floods the membrane assembly, close the chemical cleaning pump 14 and keep the air inlet valve 28 open for 30 minutes of air washing and soaking, so that the solution fully reacts with the organic pollutants on the membrane surface.

[0038] 3.3. Re-dosing: Open the vent valve 8 to drain the solution in the membrane tank 1, then close the vent valve 8, repeat the above steps of preparing the solution, and pour the newly prepared alkaline cleaning solution into the membrane filament 2 and discharge it into the membrane tank 1.

[0039] 3.4. Circulating cleaning: Close the dispensing pump 22, the dispensing valve 21 and the chemical cleaning valve 12, open the circulating valve 16, and use the chemical circulating pipeline 15 to circulate the solution in the membrane tank 1 between the membrane tank 1 and the cleaning tank 11 for 10 minutes of circulating cleaning, so as to enhance the cleaning effect.

[0040] 3.5. Flushing: Close the circulating valve 16, open the physical cleaning pump 25, and use the water produced by the water production tank 9 to flush the chemicals adhered to the membrane surface. After flushing, open the vent valve 8 to empty the membrane tank 1, and complete the alkaline cleaning.

[0041] 4. Acid cleaning process

[0042] The acid cleaning operation is basically the same as the alkaline cleaning operation, except that when preparing the acid cleaning solution in the cleaning tank 11, citric acid is added to the cleaning tank 11 through the third chemical tank 19 to make the pH value of the solution reach 3, which is used to remove the inorganic pollutants on the membrane surface. According to the steps of "emptying → soaking + air washing → discharging → circulating → flushing", the acid cleaning is completed.

[0043] The chemical cleaning cycle is usually performed once a week, and the alkali cleaning and the acid cleaning are performed separately; in actual use, the frequency and the specific operation parameters of the cleaning can be flexibly adjusted according to the pollution degree and the operation condition of the ultrafiltration membrane.

[0044] The principle and implementation mode of the utility model are described by applying specific examples in the utility model, and the above embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and the application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A device for physico-chemical cleaning of immersed ultrafiltration membranes, characterized in that it comprises: include: A membrane tank, one end of which is connected to an inlet pipe and an inlet valve is installed on the inlet pipe; the other end of which is connected to an outlet pipe and an outlet valve is installed on the outlet pipe; and the bottom of the membrane tank is connected to a discharge pipe and an vent valve is installed on the discharge pipe. A membrane fiber is disposed within the membrane tank, and the inner side of the membrane fiber is connected to one end of the outlet pipe that extends into the membrane tank. A water production tank, wherein the water production tank is connected to the end of the water outlet pipe away from the membrane tank; A water production pump is installed on the water outlet pipe between the water outlet valve and the water production tank; A physical cleaning mechanism, one end of which is connected to the product water tank and the other end of which is connected to the interior of the membrane fiber to input water from the product water tank into the membrane fiber for backwashing of the membrane fiber; An air washing mechanism, the output end of which is connected to the membrane tank to deliver gas into the membrane tank to perform air washing on the membrane fibers; A chemical cleaning mechanism includes a cleaning tank, a chemical cleaning valve, a chemical delivery pipe, a chemical cleaning pump, a chemical circulation pipe, and a circulation valve. The cleaning tank is used to prepare the cleaning solution. One end of the chemical delivery pipe is connected to the cleaning tank, and the other end is connected to the interior of the membrane fiber. The chemical cleaning valve and the chemical cleaning pump are both located on the chemical delivery pipe. The chemical cleaning valve is located near the cleaning tank, and the chemical cleaning pump is located near the membrane fiber. One end of the chemical circulation pipe is connected to the membrane tank, and the other end is connected to the chemical delivery pipe between the chemical cleaning valve and the chemical cleaning pump. The circulation valve is located on the chemical circulation pipe.

2. The device for physico-chemical cleaning of immersed ultrafiltration membranes according to claim 1, characterized in that: It also includes a first medicine box, a second medicine box, and a third medicine box. The first medicine box is used to hold sodium hypochlorite and is connected to the cleaning tank to add sodium hypochlorite to the cleaning tank. The second medicine box is used to hold sodium hydroxide and is connected to the cleaning tank to add sodium hydroxide to the cleaning tank. The third medicine box is used to hold citric acid and is connected to the cleaning tank to add citric acid to the cleaning tank.

3. The device for physico-chemical cleaning of immersed ultrafiltration membranes according to claim 2, characterized in that: It also includes a water supply pipeline, a dosing valve, and a dosing pump. One end of the water supply pipeline is connected to the cleaning tank, and the other end is connected to the product water tank. The dosing valve and the dosing pump are installed on the water supply pipeline.

4. The device for physical-chemical cleaning of immersed ultrafiltration membranes according to claim 1, characterized in that: The physical cleaning mechanism includes a physical cleaning pipe, a physical cleaning valve, and a physical cleaning pump. One end of the physical cleaning pipe is connected to the product water tank, and the other end is connected to the outlet pipe between the outlet valve and the membrane fiber.

5. The device for physico-chemical cleaning of immersed ultrafiltration membranes according to claim 1, characterized in that: The air washing mechanism includes a blower, an air inlet pipe, and an air inlet valve. One end of the air inlet pipe is connected to the blower, and the other end is connected to the membrane tank.

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