Novel softening membrane assembly

Abstract

The utility model relates to a novel softening membrane assembly, belongs to the technical field of wastewater treatment, and solves the problems that a membrane assembly in the prior art is inconvenient to disassemble, membrane filaments can only be integrally replaced after being damaged, so that resources are wasted, the backwashing effect of the membrane filaments is poor and the like. The utility model provides a novel softening membrane assembly. The novel softening membrane assembly comprises an upper sealing head, a columnar shell, membrane wires and a lower sealing head, a pattern plate is arranged on the upper end face of the columnar shell, a plurality of through holes are formed in the pattern plate, one ends of the membrane filaments are arranged in the through holes, and the other ends of the membrane filaments are free ends and naturally droop by utilizing self weight; the upper sealing head is detachably connected with the columnar shell, and the lower sealing head is detachably connected with the columnar shell. The novel softening membrane assembly is convenient to disassemble and good in filtering effect, efficient filtering and backwashing can be achieved, when the membrane filaments are damaged, independent replacement is convenient, and cost and resources can be saved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a novel softening membrane module. Background Technology

[0002] Ultrafiltration membrane technology is widely used in water treatment, and the core component of the membrane device is the membrane module, which has the most significant impact on the overall project. Hollow fiber ultrafiltration membranes account for more than 70% of the ultrafiltration membrane market due to their advantages such as high packing density, large flux, low operating pressure, and ease of backwashing.

[0003] Existing hollow fiber ultrafiltration membrane modules consist of hollow fiber membrane filaments (i.e., capillaries) made of polymer materials encapsulated within a single housing. Raw water, pressurized by a pressure pump, enters the housing and is filtered through a dense layer on the outer surface of the hollow fiber membrane filaments. Purified water permeates through this dense layer into the inner cavity of the hollow fiber membrane filaments, then collects and exits from the purified water outlet at the top of the housing. Contaminants that fail to permeate through the dense layer are retained within the housing and in the raw water. After a certain filtration cycle, contaminants accumulate on the surface of the hollow fiber membrane filaments, gradually reducing their filtration capacity and affecting purified water production. At this point, compressed air is introduced into the membrane module through the air inlet. This compressed air flows towards the surface of the hollow fiber membrane filaments for cleaning, while simultaneously, a certain flow rate of clean water is injected through the purified water outlet. The clean water permeates from the inner cavity of the hollow fiber membrane filaments outwards. This combined cleaning action of compressed air and clean water removes contaminants adhering to the outer surface of the hollow fiber membrane filaments, ensuring the membrane module's long-term effective operation.

[0004] The utility model patent with patent number CN205886620U provides a pressure membrane assembly, which improves the backwashing effect of membrane fibers to a certain extent. However, it still has the problem that when individual membrane fibers are damaged, the entire assembly must be replaced, resulting in unnecessary waste of resources. In addition, although the backwashing effect of membrane fibers is improved, the problem of poor cleaning effect of membrane fibers inside the membrane fiber / fiber bundle still exists. Utility Model Content

[0005] Based on the above analysis, this utility model aims to provide a novel softening membrane module to solve at least one of the following problems in the prior art: inconvenient disassembly of membrane modules, waste of resources due to the need to replace the entire membrane when the membrane fibers are damaged, and poor backwashing effect of the membrane fibers.

[0006] The objective of this utility model is mainly achieved through the following technical solutions:

[0007] This utility model provides a novel softening membrane assembly, characterized in that the softening membrane assembly includes an upper end cap 1, a columnar shell 6, membrane fibers 14, and a lower end cap 10;

[0008] The upper surface of the columnar shell 6 is a flower plate 5, which is provided with a number of through holes 8. One end of the membrane filament 14 is disposed in the through hole 8, and the other end of the membrane filament 14 is a free end that hangs down naturally by its own weight.

[0009] The upper end cap 1 and the columnar shell 6 are detachably connected at one end, and the lower end cap 10 and the columnar shell 6 are detachably connected at the other end.

[0010] Specifically, the upper end cap 1 and / or the lower end cap 10 are connected to the columnar shell 6 by a sealing mesh.

[0011] Specifically, the membrane filament 14 is a hollow fiber membrane with an open top and a sealed bottom.

[0012] Specifically, the upper end cap 1 is provided with a water outlet 2 and an upper air inlet 3, and the lower end cap 10 is provided with a lower air inlet 13.

[0013] Specifically, the columnar shell 6 is provided with a concentrate outlet 7, which is located on the side wall of the columnar body near the upper end face.

[0014] Specifically, the lower end cap 10 is provided with a slag discharge port 12, which is located at the bottom of the lower end cap 10.

[0015] Specifically, the lower end cap 10 is provided with a water inlet 11, and the water inlet 11 is positioned higher than the slag discharge port 12.

[0016] Specifically, the shape and size of the through hole 8 are matched with the diameter of the membrane filament 14, and the membrane filament 14 is fixed on the through hole 8 by a slot, and then fixed on the tube sheet 5.

[0017] Preferably, the through holes 8 are evenly distributed on the tube sheet 5, and the number of through holes 8 is 50 to 300.

[0018] Specifically, the diameter of the membrane filament 14 is 3–20 μm.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] 1. The upper end face of the columnar shell of this utility model adopts a flower plate design, and the membrane filaments are fixed in the through holes of the flower plate, with the upper end of the membrane filaments fixed and the lower end hanging down naturally.

[0021] Using membrane fibers instead of fiber bundles in existing technologies can avoid the phenomenon of poor water flow in the central part of the membrane fiber bundle due to mutual compression of membrane fibers, thereby improving filtration efficiency.

[0022] On the other hand, because the membrane fibers are independent of each other and their bottom ends hang naturally, they have greater freedom during backwashing, allowing the membrane fibers to fully contact the backwash gas and backwash water / clean water, which can significantly improve the efficiency of backwashing.

[0023] 2. When individual membrane fibers are damaged, resulting in substandard water quality, the damaged membrane fibers can be replaced individually without replacing the entire module or fiber bundle, thus saving resources and costs.

[0024] 3. This new type of softening membrane module can be applied not only to conventional industrial wastewater, but also to the treatment of highly challenging wastewater from industries such as new energy batteries, non-ferrous metals, and solid waste; it is suitable for all water bodies, especially highly challenging wastewater with high suspended solids concentration and high COD concentration.

[0025] 4. The softening membrane assembly provided by this utility model is easy to disassemble, and is simple to operate during installation, maintenance and replacement, and has excellent filtration effect, making it suitable for large-scale promotion.

[0026] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0027] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0028] Figure 1 This is a schematic diagram of the structure of a novel softening membrane assembly;

[0029] Figure 2 This is one possible perforated structure.

[0030] Figure label:

[0031] 1. Upper head; 2. Outlet; 3. Upper air inlet; 4. Upper head sealing membrane; 5. Perforated plate; 6. Columnar shell; 7. Concentrate inlet; 8. Through hole; 9. Lower head sealing membrane; 10. Lower head; 11. Inlet; 12. Slag discharge port; 13. Lower air inlet; 14. Membrane fiber. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0033] This utility model provides a novel softening membrane assembly, which includes an upper end cap, a columnar shell, membrane fibers, and a lower end cap;

[0034] The upper surface of the columnar shell is a perforated plate, which has several through holes. The membrane filaments are disposed in the through holes and hang down naturally by their own weight, with no fixed bottom.

[0035] The upper end cap and the cylindrical shell are detachably connected, and the lower end cap and the cylindrical shell are also detachably connected.

[0036] Specifically, using membrane fibers instead of fiber bundles in existing technologies can avoid the phenomenon of poor water flow in the central part of the membrane fibers due to mutual compression, thereby improving filtration efficiency. On the other hand, since the membrane fibers are independent of each other and their bottom ends hang naturally, they have greater freedom during backwashing, allowing the membrane fibers to fully contact the backwash gas and purified water, which can significantly improve the efficiency of backwashing, thereby shortening the cleaning cycle and reducing the impact on continuous production.

[0037] Furthermore, when individual membrane fibers are damaged, resulting in substandard water quality, the damaged membrane fibers can be replaced individually without replacing the entire module or fiber bundle, thus saving resources and costs.

[0038] Preferably, the upper end cap and / or lower end cap are connected to the columnar shell via a sealing stencil. Compared to other detachable connections, the stencil connection is easy to disassemble while maintaining good sealing performance, preventing water or air leakage during component operation. When installing or replacing membrane fibers, the stencil can be disassembled for operation, improving the efficiency of membrane fiber installation and replacement.

[0039] Specifically, the membrane fibers are hollow fiber membranes with an open top and sealed bottom, with a diameter of 3–20 μm. Wastewater enters from the outside of the membrane fibers, while water is produced inside, collected at the top cap, and discharged through the outlet. The membrane fibers are made of PTFE, with a temperature resistance of ≥120℃ and a filtration accuracy of 0.02–0.1 μm. PTFE, commonly known as the "king of plastics," has the characteristics of high temperature resistance and acid and alkali resistance.

[0040] Ultrafiltration using membrane modules made from the aforementioned membrane fibers offers advantages such as low energy consumption (operating pressure less than 0.35 bar), reducing energy consumption by over 90% compared to traditional processes; strong antifouling resistance (influent suspended solids up to 10,000 mg / L); high water recovery rate (up to 95%); and a product water SDI ≤ 3.0. It can maintain high-flux operation (NWP ≥ 200 LMH) and has a long lifespan of at least 10 years. Given these advantages, ultrafiltration using these membrane modules can replace multiple process stages in traditional methods, reducing overall investment, floor space requirements, and project construction time.

[0041] Specifically, the upper end cap is provided with a water outlet and an upper air inlet. The water outlet preferably adopts a copy connector for easy connection to external pipes; the upper air inlet preferably adopts a quick-connect connector.

[0042] Specifically, the cylindrical shell is provided with a concentrate outlet, which is located on the side wall of the cylindrical body near the upper end face. The concentrate outlet is used to discharge waste liquid during the backwashing process.

[0043] Specifically, the lower end cap is provided with a slag discharge port, which is located at the bottom of the lower end cap. Impurities in the water settle to the bottom of the lower end cap and are periodically discharged through the slag discharge port to prevent them from settling at the bottom.

[0044] Preferably, the upper end of the slag discharge port is designed with a slope of 65-85° to facilitate the discharge of solid impurities.

[0045] Specifically, the lower end cap is also provided with a water inlet, which is positioned higher than the slag discharge port.

[0046] Specifically, the lower end cap is provided with a lower air inlet, which is used to introduce compressed air during the backwashing process.

[0047] Specifically, the shape and size of the through hole match the diameter of the membrane filament. The membrane filament is fixed to the through hole by a slot, and then fixed to the tube sheet. The membrane filament body hangs naturally by its own weight.

[0048] Preferably, the through holes are evenly distributed on the tube sheet, and the number of through holes is 50 to 300, for example, 50, 100, 150, 200, 250, or 300. If the number of through holes is too small, the internal space of the component will not be fully utilized, resulting in low filtration efficiency; if the number of through holes is too large, it will lead to insufficient structural strength of the tube sheet or even the formation of fine cracks, which may cause damage during operation.

[0049] The operation process of the novel softening film assembly provided by this utility model is as follows:

[0050] First, based on the structural design drawings (e.g.) Figure 1Assemble the membrane modules and install them in their corresponding positions within the entire equipment.

[0051] (Filtration process) Water enters through the lower inlet of the lower end cap and fills the membrane shell from bottom to top. Under pressure, the liquid passes through the membrane surface and enters the membrane interior, which is the product water. The product water is collected in the upper end cap and flows out from the outlet of the upper end cap.

[0052] (Cleaning Process) After the filtration program has been running for a period of time, the equipment is stopped. Solid impurities and residual water are discharged from the slag discharge port and the slag discharge port is closed. The lower air intake program is then initiated. Compressed air enters through the lower air intake port of the lower end cap to flush and shake the membrane. After the lower air intake program is completed, backwash water (clean water) is introduced from the outlet of the upper end cap and pressurized. Under pressure, the backwash water / clean water flows from the inside of the membrane fibers to the outside of the membrane fibers (reverse of the filtration process) and is discharged from the concentrate outlet, thereby achieving the purpose of cleaning.

[0053] (Slag Removal Procedure) An irregular slag removal procedure is implemented according to different working conditions;

[0054] (Membrane fiber replacement) Disassemble the upper and lower end cap sealing membranes, remove the cylindrical shell and take out the damaged membrane fiber from the tube sheet, replace it with a new membrane fiber, and then reinstall the cylindrical shell back into its original position.

[0055] The parameters during filtration and cleaning can be set according to actual needs, referring to parameters in existing technologies. Generally speaking, the lower the filtration pressure, the slower the filtration speed, but the better the filtration effect; the higher the filtration pressure, the faster the filtration speed, but the filtration effect will be reduced and the service life of the membrane fibers will be shortened to some extent. The cleaning process is similar to the filtration process, and a reasonable compressed air flux and backwashing pressure should be determined according to actual needs and the specific parameters of the membrane fibers.

[0056] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel softening membrane module, characterized in that, The softening membrane assembly includes an upper end cap (1), a columnar shell (6), membrane fibers (14), and a lower end cap (10); The upper surface of the columnar shell (6) is a flower plate (5), and the flower plate (5) is provided with a number of through holes (8). One end of the membrane filament (14) is placed in the through hole (8), and the other end of the membrane filament (14) is a free end that hangs down naturally by its own weight. The upper end cap (1) and the columnar shell (6) are detachably connected at one end, and the lower end cap (10) and the columnar shell (6) are detachably connected at the other end.

2. The component according to claim 1, characterized in that, The upper end cap (1) and / or lower end cap (10) are connected to the columnar shell (6) by a sealing ring.

3. The component according to claim 1, characterized in that, The membrane filament (14) is a hollow fiber membrane with an open top and a sealed bottom.

4. The component according to claim 1, characterized in that, The upper end cap (1) is provided with a water outlet (2) and an upper air inlet (3), and the lower end cap (10) is provided with a lower air inlet (13).

5. The component according to claim 1, characterized in that, The columnar shell (6) is provided with a concentrate outlet (7), which is located on the side wall of the columnar shell (6) near the upper end face.

6. The component according to claim 1, characterized in that, The lower end cap (10) is provided with a slag discharge port (12), which is located at the bottom of the lower end cap (10).

7. The component according to claim 6, characterized in that, The lower end cap (10) is provided with a water inlet (11), and the water inlet (11) is positioned higher than the slag discharge port (12).

8. The component according to claim 1, characterized in that, The shape and size of the through hole (8) are matched with the diameter of the membrane filament (14), and the membrane filament (14) is fixed on the through hole (8) by a slot, and then fixed on the flower plate (5).

9. The component according to claim 1, characterized in that, The through holes (8) are evenly distributed on the flower plate (5), and the number of through holes (8) is 50 to 300.

10. The component according to claim 1, characterized in that, The diameter of the membrane filament (14) is 3 to 20 μm.

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