Self-cleaning ultrafiltration device

Abstract

The utility model provides a kind of self-cleaning ultrafiltration device, the self-cleaning ultrafiltration device includes raw water storage component, ultrafiltration assembly and water production storage component connected in turn;The outside of the ultrafiltration assembly is connected with chemical cleaning assembly, gas washing assembly and control component;The chemical cleaning assembly is circularly connected with the ultrafiltration assembly;The water production assembly is circularly connected with the ultrafiltration assembly;Each component in the self-cleaning ultrafiltration device synergizes, realizes the synergistic automatic cleaning effect including chemical cleaning, water backwashing and gas washing in the ultrafiltration membrane in the ultrafiltration assembly, and the device is stable in operation.

Description

Technical Field

[0001] This utility model belongs to the technical field of membrane separation equipment, and specifically relates to a self-cleaning ultrafiltration device. Background Technology

[0002] An ultrafiltration device is a membrane separation technology that utilizes the screening and pressure-driven action of the ultrafiltration membrane to purify and separate solutions. The pore size of ultrafiltration membranes is typically between 0.001 and 0.02 μm, effectively retaining suspended solids, colloids, bacteria, viruses, and large organic molecules in the solution, while allowing water molecules and small molecules to permeate. The ultrafiltration process is driven by the pressure difference across the membrane; by applying a certain pressure, the solvent and small molecules in the liquid mixture permeate through the membrane, while large molecules are retained.

[0003] However, ultrafiltration membranes, also known as reverse osmosis membranes, are susceptible to various contaminants during use. These contaminants primarily include: inorganic deposits (such as calcium and magnesium scale), which clog membrane pores and affect water production; organic contaminants (such as microorganisms and grease), which clog the membrane surface and reduce filtration efficiency; and colloidal particles, which clog membrane pores and degrade membrane performance. These contaminants adhere to the membrane surface, causing a gradual decline in membrane performance, leading to increased operating pressure differential, deteriorated water quality, and reduced flux in the ultrafiltration system. Therefore, regular cleaning is essential.

[0004] Current ultrafiltration devices have poor cleaning performance, can only remove some contaminants from the membrane surface, require frequent cleaning, cause significant mechanical damage to the membrane, necessitate frequent replacement of the ultrafiltration membrane, and have a relatively complex control system, thus increasing the cost of ultrafiltration.

[0005] For example, CN106621815B discloses an ultrafiltration device for intelligent control of ultrasonic cleaning of membranes. When the fouling of the ultrafiltration membrane exceeds the standard range, the intelligent controller controls the ultrafiltration system to stop working, opens the cleaning nozzle to perform liquid spraying, and simultaneously notifies the ultrasonic generator to emit ultrasonic waves. After cleaning is completed, the drain valve is opened to discharge the fouling, and the ultrasonic system and cleaning module are shut down. However, the ultrasonic cleaning process may affect the integrity of the membrane assembly, such as causing membrane fiber breakage. Moreover, ultrasonic cleaning can generally only remove some of the deposits on the membrane surface, and its removal effect on highly adhesive pollutants is poor. Furthermore, some organic matter or biofilms formed by microorganisms may develop resistance to ultrasonic cleaning.

[0006] In response to the above situation, this utility model proposes a novel self-cleaning ultrafiltration device that can simultaneously achieve automatic cleaning functions of backwashing, gas washing, and chemical cleaning, thereby improving the cleaning effect, extending the service life of the ultrafiltration membrane, and being easy to operate. Utility Model Content

[0007] To address the problems existing in the prior art, the purpose of this utility model is to provide a self-cleaning ultrafiltration device that enables coordinated automatic cleaning of the ultrafiltration membrane in the ultrafiltration module, including chemical cleaning, water backwashing, and air washing, greatly shortening the cleaning time. Moreover, the self-cleaning ultrafiltration device operates stably and has an extended service life.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] This utility model provides a self-cleaning ultrafiltration device, which includes a raw water storage component, an ultrafiltration component, and a product water storage component connected in sequence.

[0010] The ultrafiltration unit is connected to a chemical cleaning unit, an air washing unit, and a control unit on its outer side; the chemical cleaning unit is cyclically connected to the ultrafiltration unit; and the product water storage unit is cyclically connected to the ultrafiltration unit.

[0011] The self-cleaning ultrafiltration device of this invention provides a chemical cleaning component, an air washing component, and a control component on the outside of the ultrafiltration module. The product water storage component is designed to be circulatedly connected to the ultrafiltration module to achieve water backwashing. Combined with the control component, the ultrafiltration membrane achieves an automatic synergistic cleaning effect including chemical cleaning, water backwashing, and air washing. Compared with traditional ultrasonic cleaning ultrafiltration devices, the cleaning effect is significantly improved, and the cleaning time is relatively short and the cleaning frequency is reduced.

[0012] The following are preferred technical solutions of this utility model, but are not intended to limit the technical solutions provided by this utility model. Through the following preferred technical solutions, the purpose and beneficial effects of this utility model can be better achieved.

[0013] Preferably, the chemical cleaning assembly includes an acid washing assembly and an alkaline washing assembly connected in parallel.

[0014] Preferably, the pickling assembly and the alkaline washing assembly can be operated independently or in combination.

[0015] Among them, from the side closest to the ultrafiltration membrane surface to the side furthest from the ultrafiltration membrane surface, the impurities on the ultrafiltration membrane mainly include a mixture of metallic inorganic salts (such as iron hydroxide), silt and organic matter. In chemical cleaning, alkaline washing first removes the organic contaminants on the outside, and then acid washing removes the metallic inorganic salts on the inside. Water backwashing makes the contaminants fluffy and easier to fall off. The air washing component uses air bubbles to flush the contaminants on the membrane surface to assist water backwashing.

[0016] Preferably, the pickling assembly includes an acid storage component and a first dosing component connected together.

[0017] Preferably, the alkaline washing assembly includes an alkaline solution storage component and a second dosing component connected in series.

[0018] Preferably, the ultrafiltration assembly includes at least two ultrafiltration components connected in parallel, such as two, three, or four.

[0019] Preferably, each of the ultrafiltration components is provided with an ultrafiltration membrane.

[0020] Preferably, the raw water storage component is connected to the bottom of each of the ultrafiltration components via a first conveying pipe.

[0021] Preferably, the bottom of the acid storage component is connected to the first delivery pipe via a second delivery pipe.

[0022] Preferably, the bottom of the alkali storage component is connected to the first conveying pipe via a third conveying pipe.

[0023] Preferably, the top of the acid storage component is connected to the top of each of the ultrafiltration components via a fourth delivery pipe.

[0024] Preferably, the top of the alkali storage component is connected to the top of each of the ultrafiltration components via a fifth delivery pipe.

[0025] Preferably, a first bypass pipe extends from the side of the acid storage component and connects to the second delivery pipe to form a first bypass circulation pipeline.

[0026] Preferably, a second bypass pipe extends from the side of the alkali storage component and connects to the third delivery pipe to form a second bypass circulation pipeline.

[0027] The first bypass circulation pipeline and the second bypass pipeline in this invention are designed to facilitate the full dissolution of solid acidic and solid alkaline agents and to balance the cleaning pressure of the ultrafiltration membrane, thereby making the self-cleaning ultrafiltration device operate more stably.

[0028] Preferably, the fourth conveying pipe is provided with a first filter component.

[0029] Preferably, a second filter element is provided on the fifth conveying pipe.

[0030] The present invention further preferably provides a first filter component on the fourth conveying pipe and a second filter component on the fifth conveying pipe, for filtering impurities after acid washing or alkali washing and discharging them through the sewage discharge pipe to avoid contamination or blockage of the circulation pipeline.

[0031] Preferably, the acid storage component is provided with a first stirring element inside.

[0032] Preferably, the alkaline solution storage component is provided with a second stirring element inside.

[0033] The present invention further preferably includes a first stirring element inside the acid storage component, and further preferably includes a second stirring element inside the alkali storage component. This facilitates the full dissolution of the acidic or alkali solid agents added from the first and second dosing components, thereby improving the subsequent chemical cleaning effect and preventing waste of agents.

[0034] Preferably, the top of the water production storage component, the bottom of the water production storage component, and the top side of each of the ultrafiltration components are circulatedly connected by pipes.

[0035] Preferably, a third filtration component is provided on the pipeline connecting the bottom of the water storage component to the top side of each of the ultrafiltration components.

[0036] Since the water in the product water storage component contains some impurities, such as broken membrane fibers, organic matter, and fine particles, it is easy to further contaminate or damage the ultrafiltration membrane during water backwashing. Therefore, this utility model provides a third filter component on the pipeline connecting the bottom of the product water storage component and the top side of each ultrafiltration component to filter and remove impurities, thereby further improving the cleaning effect.

[0037] Preferably, the air washing assembly includes an air supply component.

[0038] Preferably, the gas supply component is connected to the bottom of each of the ultrafiltration components via a pipe.

[0039] Preferably, the first conveying pipe, the fourth conveying pipe, and the fifth conveying pipe each extend independently into a sewage discharge pipe.

[0040] The specific operation method of the self-cleaning ultrafiltration device described in this utility model is as follows:

[0041] When the ultrafiltration unit becomes clogged and the flux drops significantly, the control component (PLC controller) in the self-cleaning ultrafiltration unit first opens the backwash pipeline, i.e., the control valve between the product water storage component and the ultrafiltration module, to perform backwashing. This loosens the surface of the ultrafiltration membrane fibers, making it easier for contaminants to detach and be removed. Then, the alkaline washing component is opened to remove the outer layer of silt and organic contaminants, allowing the acid solution to better contact the metal oxides and other contaminants on the surface of the ultrafiltration membrane fibers during subsequent acid washing. Next, the acid washing component is opened to remove the inner layer of inorganic metal salts or metal oxides and other contaminants. Finally, the air washing component is opened to perform air scrubbing to further remove fine contaminants from the membrane fiber surface, thereby restoring the flux and achieving excellent cleaning results.

[0042] In addition, the automatic backwash program needs to be adjusted regularly because the temperature of the raw water varies significantly in different regions and at different times due to the influence of different regions and seasons. Temperature changes directly affect the backwash effect. Therefore, the program needs to be adjusted accordingly based on the different raw water temperatures. The key is to adjust the air scrubbing time. If the process design allows, the air scrubbing stage time should be appropriately extended during the low temperature period to achieve a better backwash effect.

[0043] The numerical range described in this utility model includes not only the point values ​​listed above, but also any point values ​​within the numerical range that are not listed. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list all the specific point values ​​included in the range.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] (1) The present invention provides a self-cleaning ultrafiltration device, which sets a chemical cleaning component, an air washing component and a control component on the outside of the ultrafiltration component, and sets the product water storage component to be circulatedly connected to the ultrafiltration component to realize water backwashing. The components work together to realize efficient automatic cleaning of the ultrafiltration membrane in the ultrafiltration component, including chemical cleaning, water backwashing and air washing, which improves the cleaning efficiency and solves the problem in the prior art that the ultrafiltration membrane is easily damaged and fails due to the need for frequent cleaning because of poor cleaning effect.

[0046] (2) The present invention provides a self-cleaning ultrafiltration device, wherein the self-cleaning device further extends the first bypass pipe and the second bypass pipe to the side of the acid storage component and the alkali storage component respectively to form the first bypass circulation pipeline and the second bypass circulation pipeline respectively. On the one hand, it is beneficial to promote the full dissolution of solid acidic agents and solid alkali agents, and on the other hand, it can balance the cleaning pressure of the ultrafiltration membrane, making the self-cleaning ultrafiltration device operate more stably, reducing energy consumption, and reducing the risk of mechanical damage to the ultrafiltration membrane. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure and connection relationship of the self-cleaning ultrafiltration device provided in Embodiment 1 of this utility model;

[0048] Explanation of reference numerals in the attached drawings: 1. Raw water storage component; 2. Ultrafiltration component; 3. Product water storage component; 4. Acid storage component; 5. First dosing component; 6. First agitator; 7. Alkali storage component; 8. Second dosing component; 9. Second agitator; 10. Control component; 11. Gas supply component; 12. First conveying pipeline; 13. Second conveying pipeline; 14. Third conveying pipeline; 15. Fourth conveying pipeline; 16. Fifth conveying pipeline; 17. First bypass pipeline; 18. Second bypass pipeline; 19. First filtration component; 20. Second filtration component; 21. Third filtration component. Detailed Implementation

[0049] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this utility model and should not be considered as specific limitations thereof.

[0050] It should be understood that in the description of this utility model, the terms "outer side," "side," "side top," "parallel," "inner," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. The terms "first," "second," "third," "fourth," and "fifth," etc., do not indicate the importance of the components and therefore should not be construed as limitations on this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of this utility model.

[0051] In the following embodiments or comparative examples, the air supply component provides compressed air, the first dosing component adds a solid acidic agent, and the second dosing component adds a solid alkaline agent.

[0052] I. Implementation Examples

[0053] Example 1

[0054] This embodiment provides a self-cleaning ultrafiltration device, such as... Figure 1 As shown, the self-cleaning ultrafiltration device includes a raw water storage component 1, an ultrafiltration module, and a product water storage component 3 connected in sequence.

[0055] The ultrafiltration module is connected to a chemical cleaning module, an air washing module, and a control unit 10 on its outer side; the chemical cleaning module is circulatedly connected to the ultrafiltration module; the product water storage unit 3 is circulatedly connected to the ultrafiltration module.

[0056] The chemical cleaning assembly includes an acid washing assembly and an alkaline washing assembly connected in parallel; the acid washing assembly includes an acid storage component 4 and a first dosing component 5 connected in series; the alkaline washing assembly includes an alkaline storage component 7 and a second dosing component 8 connected in series; the acid storage component 4 is provided with a first stirring element 6; the alkaline storage component 7 is provided with a second stirring element 9.

[0057] The ultrafiltration assembly includes two ultrafiltration components 2 connected in parallel; the raw water storage component 1 is connected to the bottom of each ultrafiltration component 2 via a first conveying pipe 12; the bottom of the acid storage component 4 is connected to the first conveying pipe 12 via a second conveying pipe 13; the bottom of the alkali storage component 7 is connected to the first conveying pipe 12 via a third conveying pipe 14; the top of the acid storage component 4 is connected to the top of each ultrafiltration component 2 via a fourth conveying pipe 15; the top of the alkali storage component 7 is connected to the top of each ultrafiltration component 2 via a fifth conveying pipe 16; a first filter component 19 is provided on the fourth conveying pipe 15; a second filter component 20 is provided on the fifth conveying pipe 16; the first conveying pipe 12, the fourth conveying pipe 15, and the fifth conveying pipe 16 each independently extend into a wastewater discharge pipe;

[0058] The acid storage component 4 extends a first bypass pipe 17 from its side and connects to the second delivery pipe 13 to form a first bypass circulation pipeline; the alkali storage component 7 extends a second bypass pipe 18 from its side and connects to the third delivery pipe 14 to form a second bypass circulation pipeline.

[0059] The top and bottom of the water production storage component 3 are connected to the top side of each of the ultrafiltration components 2 via a pipeline; a third filter component 21 is provided on the pipeline connecting the bottom of the water production storage component 3 to the top side of each of the ultrafiltration components 2.

[0060] The air washing assembly includes an air supply component 11, i.e., an air pump; the air supply component 11 is connected to the bottom of each of the ultrafiltration components 2 via a pipe.

[0061] The self-cleaning ultrafiltration device described in this embodiment has a better cleaning effect than traditional ultrasonic cleaning ultrafiltration devices or ultrafiltration devices that only contain chemical cleaning. It significantly reduces the cleaning frequency, extends the service life of the ultrafiltration membrane, and can operate stably for a long time.

[0062] Example 2

[0063] This embodiment provides a self-cleaning ultrafiltration device, which includes a raw water storage component, an ultrafiltration module, and a product water storage component connected in sequence.

[0064] The ultrafiltration module is connected to a chemical cleaning module, an air washing module, and a control unit on its outer side; the chemical cleaning module is cyclically connected to the ultrafiltration module; the product water storage unit is cyclically connected to the ultrafiltration module.

[0065] The chemical cleaning assembly includes an acid washing assembly and an alkaline washing assembly connected in parallel; the acid washing assembly includes an acid storage component and a first dosing component connected in series; the alkaline washing assembly includes an alkaline storage component and a second dosing component connected in series.

[0066] The ultrafiltration assembly includes three ultrafiltration components connected in parallel; the raw water storage component is connected to the bottom of each ultrafiltration component via a first conveying pipe; the bottom of the acid storage component is connected to the first conveying pipe via a second conveying pipe; the bottom of the alkali storage component is connected to the first conveying pipe via a third conveying pipe; the top of the acid storage component is connected to the top of each ultrafiltration component via a fourth conveying pipe; the top of the alkali storage component is connected to the top of each ultrafiltration component via a fifth conveying pipe; a first filter component is installed on the fourth conveying pipe; a second filter component is installed on the fifth conveying pipe; and each of the first, fourth, and fifth conveying pipes independently extends into a wastewater discharge pipe.

[0067] A first bypass pipe extends from the side of the acid storage component and connects to the second delivery pipe to form a first bypass circulation pipeline; a second bypass pipe extends from the side of the alkali storage component and connects to the third delivery pipe to form a second bypass circulation pipeline.

[0068] The top and bottom of the water production storage component are circulatedly connected to the top side of each of the ultrafiltration components via pipes; a third filtration component is provided on the pipe connecting the bottom of the water production storage component to the top side of each of the ultrafiltration components.

[0069] The air washing assembly includes an air supply component, namely an air pump; the air supply component is connected to the bottom of each of the ultrafiltration components via a pipe.

[0070] The cleaning efficiency and effect of the self-cleaning ultrafiltration device described in this embodiment are comparable to those of the self-cleaning device described in Embodiment 1, and it operates stably.

[0071] Example 3

[0072] This embodiment provides a self-cleaning ultrafiltration device. Except for the fact that no pipes extend from the side of the acid storage component and the side of the alkali storage component, i.e., no first bypass circulation pipe and second bypass circulation pipe are formed, the self-cleaning ultrafiltration device is the same as that in Embodiment 1.

[0073] The self-cleaning ultrafiltration device described in this embodiment does not form the first bypass circulation pipeline and the second bypass circulation pipeline, resulting in excessive pressure in the pipeline during acid washing or alkaline washing, which may cause mechanical damage to the ultrafiltration membrane. In addition, the solid reagent cannot be fully dissolved, resulting in a slightly poor cleaning effect and wasting reagents.

[0074] Example 4

[0075] This embodiment provides a self-cleaning ultrafiltration device, which is the same as that in Embodiment 1 except that the third filter component is not provided.

[0076] In this embodiment, the self-cleaning ultrafiltration device does not have the third filtration component. As a result, impurities in the water in the product water storage component, such as broken membrane fibers, organic matter, and fine particles, are easily further contaminated or damaged during water backwashing, leading to a slightly poorer ultrafiltration effect and poor operational stability of the self-cleaning ultrafiltration device.

[0077] II. Comparative Example

[0078] Comparative Example 1

[0079] This comparative example provides a self-cleaning ultrafiltration device, which is the same as that in Example 1 except that the air washing component is not provided.

[0080] The self-cleaning ultrafiltration device described in this comparative example does not have the air washing component (air pump), resulting in only chemical cleaning and water backwashing effects, which reduces the cleaning efficiency and effectiveness.

[0081] Comparative Example 2

[0082] This comparative example provides a self-cleaning ultrafiltration device. Except that the product water storage component is not circulatedly connected to the ultrafiltration components, but only the top of the product water storage component is connected to the top of each of the ultrafiltration components, the self-cleaning ultrafiltration device is the same as that in Example 1.

[0083] The self-cleaning ultrafiltration device described in this comparative example has reduced cleaning efficiency because the water storage component is not circulated with the ultrafiltration module, meaning it only produces water but cannot backwash the ultrafiltration membrane.

[0084] In summary, the self-cleaning ultrafiltration device provided by this utility model, by setting up a chemical cleaning component, an air washing component, and a control component, and by setting up a product water storage component that is circulatedly connected to the ultrafiltration component, achieves coordinated and efficient automatic cleaning of the ultrafiltration membrane in the ultrafiltration component, including chemical cleaning, water backwashing, and air washing. By further setting up the first bypass circulation pipeline, the second bypass circulation pipeline, and the third filter component, the cleaning efficiency is further improved, ensuring the stable operation of the device and extending the service life of the ultrafiltration device.

[0085] The applicant declares that the detailed structural features of this utility model are illustrated through the above embodiments, but this utility model is not limited to the above detailed structural features, that is, it does not mean that this utility model must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to this utility model, equivalent substitutions of selected components, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this utility model.

Claims

1. A self-cleaning ultrafiltration device, characterized in that, The self-cleaning ultrafiltration device includes a raw water storage component, an ultrafiltration module, and a product water storage component connected in sequence. The ultrafiltration module is externally connected to a chemical cleaning module, an air washing module, and a control unit; the chemical cleaning module is cyclically connected to the ultrafiltration module; the product water storage unit is cyclically connected to the ultrafiltration module; the ultrafiltration module includes at least two ultrafiltration modules connected in parallel. The chemical cleaning assembly includes an acid washing assembly and an alkaline washing assembly connected in parallel; the acid washing assembly includes an acid storage component and a first dosing component connected in series; the alkaline washing assembly includes an alkaline storage component and a second dosing component connected in series. The raw water storage component is connected to the bottom of each of the ultrafiltration components via a first conveying pipe; the bottom of the acid storage component is connected to the first conveying pipe via a second conveying pipe; the bottom of the alkali storage component is connected to the first conveying pipe via a third conveying pipe. The acid storage component extends a first bypass pipe from its side and connects to the second delivery pipe to form a first bypass circulation pipeline; The side of the alkali storage component extends into a second bypass pipe, which connects to the third delivery pipe to form a second bypass circulation pipeline.

2. The self-cleaning ultrafiltration device according to claim 1, characterized in that, The top of the acid storage component is connected to the top of each of the ultrafiltration components via a fourth delivery pipe; The top of the alkali storage component is connected to the top of each of the ultrafiltration components via a fifth delivery pipe.

3. The self-cleaning ultrafiltration device according to claim 2, characterized in that, The fourth conveying pipe is equipped with a first filter component; A second filter component is installed on the fifth conveying pipe.

4. The self-cleaning ultrafiltration device according to claim 1, characterized in that, The acid storage component is equipped with a first stirring element; The alkaline solution storage component is equipped with a second stirring element.

5. The self-cleaning ultrafiltration device according to claim 1, characterized in that, The top and bottom of the water production storage component are circulatedly connected to the top side of each of the ultrafiltration components via pipes; A third filtration component is provided on the pipeline connecting the bottom of the water storage component to the top side of each of the ultrafiltration components.

6. The self-cleaning ultrafiltration device according to claim 1, characterized in that, The air washing assembly includes an air supply component; The gas supply component is connected to the bottom of each of the ultrafiltration components via a pipe.

7. The self-cleaning ultrafiltration device according to claim 2, characterized in that, The first conveying pipe, the fourth conveying pipe, and the fifth conveying pipe each independently extend into a sewage discharge pipe.

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