An automatic air-washing, non-powered ultrafiltration membrane water purification device

Abstract

This invention relates to the field of water purification equipment technology, specifically to an automatic air-washing, non-powered ultrafiltration membrane water purification device. It includes an inlet pipe, a sealed water tank, an ultrafiltration membrane box, a siphon downcomer, and a siphon upcomer. The ultrafiltration membrane box contains an ultrafiltration membrane module and an aeration box. An air vent is located at the top of the sealed water tank, connected to the aeration box via an air vent pipe. The height of the air vent is greater than the liquid level in the sealed water tank and is level with the top of the ultrafiltration membrane module in the ultrafiltration membrane box. A one-way air inlet valve is located at the top of the sealed water tank. The vertical height of the siphon upcomer is greater than the liquid level in the ultrafiltration membrane box. Addressing the technical problems of existing water purification filtration equipment, this invention can fully utilize the residual pressure of the inlet water during the filtration process, achieving periodic air wiping of the ultrafiltration membrane module through the periodic flushing and drainage of the sealed water tank. This process requires no electricity, operates automatically, and greatly reduces maintenance and operating costs.

Description

Technical Field

[0001] This invention relates to the field of water purification equipment technology, specifically to an automatic air-washing, non-powered ultrafiltration membrane water purification device. Background Technology

[0002] There are many types of water purification equipment available today, with diverse applications. Some water purification equipment is highly dependent on energy, requiring electricity to operate and incurring high maintenance costs. However, some remote rural areas suffer from a lack of supporting facilities such as transportation, electricity, and internet access, making it difficult to operate and maintain traditional water purification equipment.

[0003] For example, patent 201710294741.9 discloses a rural non-powered ultrafiltration membrane water purification system and a water production method based on the system. Although the system can produce water through ultrafiltration membrane without power consumption, the system cannot automatically switch between the start-up and drainage steps and still requires manual valve adjustment. At the same time, it cannot automatically perform air washing of the ultrafiltration membrane and still requires relatively high maintenance costs, which are defects that need to be improved. Summary of the Invention

[0004] To address the technical problems of existing water purification equipment, this invention provides an automatic air-washing, non-powered ultrafiltration membrane water purification device. During the water filtration process, it can make full use of the residual pressure of the inlet water and periodically flush and drain the water through a sealed water tank to achieve periodic air wiping of the ultrafiltration membrane module. Moreover, the above process requires no electricity and operates automatically, greatly reducing maintenance and operating costs.

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] An automatic air-washing, non-powered ultrafiltration membrane water purification device includes an inlet pipe, a sealed water tank, and an ultrafiltration membrane tank, all connected to the inlet pipe. An inlet valve is installed on the connection path between the inlet pipe and the sealed water tank. A membrane tank inlet valve and a float switch are installed on the connection path between the inlet pipe and the ultrafiltration membrane tank. An ultrafiltration membrane module and an aeration box are installed inside the ultrafiltration membrane tank. The aeration box is located below the ultrafiltration membrane module. The ultrafiltration membrane module discharges product water through a product water pipe equipped with a product water flow control valve. The ultrafiltration membrane tank discharges water through a drain pipe equipped with a [missing information - likely a device or device]. The system includes a drain valve; a vent is located at the top of the sealed water tank, which is connected to the aeration box via a vent pipe. The height of the vent is greater than the liquid level in the sealed water tank and is level with the top of the ultrafiltration membrane module in the ultrafiltration membrane box. A one-way air inlet valve is located at the top of the sealed water tank. The system also includes a siphon downpipe and a siphon uppipe. One end of the siphon uppipe is connected to the bottom outlet of the sealed water tank, and the other end is connected to the top of the siphon downpipe. The vertical height of the siphon uppipe is greater than the liquid level in the ultrafiltration membrane box.

[0007] Optionally, the vertical height of the siphon riser is 1.2 to 2 times the liquid level in the ultrafiltration membrane tank.

[0008] Optionally, the water pressure in the inlet pipe is greater than 0.05 MPa.

[0009] Optionally, the water pressure in the inlet pipe is 0.1 to 0.6 MPa.

[0010] Optionally, the ultrafiltration membrane module is immersed 0.1-0.3m below the liquid surface of the ultrafiltration membrane tank.

[0011] Optionally, the filtration pore size of the ultrafiltration membrane module is 0.03–0.1 micrometers; the permeate flux of the ultrafiltration membrane module is 5–15 L / (m³). 2 ·h).

[0012] Optionally, the air washing cycle of the aeration box is 5 to 15 minutes.

[0013] Optionally, a water jet is provided on the communication path between the water inlet pipe and the sealed water tank.

[0014] Optionally, a siphon auxiliary pipe is provided on one side of the siphon downpipe, the siphon auxiliary pipe is arranged parallel to the siphon downpipe, and one end of the siphon auxiliary pipe is connected to the siphon uppipe.

[0015] Optionally, the aeration box is a large-pore pulse aeration box.

[0016] Beneficial effects

[0017] Compared with existing technologies, the technical solution provided by this invention has the following advantages: Addressing the technical problems of defects in existing water purification filtration equipment, this invention can fully utilize the residual pressure of the inlet water during the filtration process, achieving periodic air rinsing of the ultrafiltration membrane module through the periodic flushing and drainage of the sealed water tank. Furthermore, this process requires no electricity and operates automatically, greatly reducing maintenance and operating costs. Simultaneously, during the drainage process of the sealed water tank, water at the bottom of the membrane chamber flows back into the sealed water tank through the vent pipe and is then discharged, achieving the function of partially draining concentrated water without power. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an automatic air-washing, non-powered ultrafiltration membrane water purification device proposed in an embodiment of the present invention. Detailed Implementation

[0019] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0020] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are for the convenience of describing the technical solutions of the invention and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solutions of the invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this invention.

[0021] Example 1

[0022] Combined with appendix Figure 1This embodiment proposes an automatic air-washing, non-powered ultrafiltration membrane water purification device, including an inlet pipe 1, a sealed water tank 10 and an ultrafiltration membrane box 3 respectively connected to the inlet pipe 1; an inlet valve 8 is provided on the connection path between the inlet pipe 1 and the sealed water tank 10; a membrane box inlet valve 2 and a float switch 18 are provided on the connection path between the inlet pipe 1 and the ultrafiltration membrane box 3; an ultrafiltration membrane module 4 and an aeration box 5 are provided inside the ultrafiltration membrane box 3, the aeration box 5 is located below the ultrafiltration membrane module 4, the ultrafiltration membrane module 4 discharges product water through a product water pipe 6, a product water flow control valve 7 is provided on the product water pipe 6, and the ultrafiltration membrane box 3 discharges water through a drain pipe 15. A drain valve 14 is provided; a vent 16 is provided on the upper part of the sealed water tank 10, and the vent 16 is connected to the aeration box 5 through the vent pipe 11. The height of the vent 16 is greater than the liquid level in the sealed water tank 10, and the height of the vent 16 is level with the top of the ultrafiltration membrane module 4 in the ultrafiltration membrane box 3. A one-way air inlet valve 9 is provided on the upper part of the sealed water tank 10; it also includes a siphon downpipe 13 and a siphon uppipe 12. One end of the siphon uppipe 12 is connected to the bottom outlet of the sealed water tank 10, and the other end of the siphon uppipe 12 is connected to the upper part of the siphon downpipe 13. The vertical height of the siphon uppipe 12 is greater than the liquid level in the ultrafiltration membrane box 3.

[0023] This embodiment of an automatic air-washing, non-powered ultrafiltration membrane water purification device is typically used in rural drinking water purification scenarios. During the water filtration process, it can make full use of the residual pressure of the inlet water and periodically flush and drain the sealed water tank 10 to achieve periodic air wiping of the ultrafiltration membrane module 4. Moreover, the above process requires no electricity and operates automatically, greatly reducing maintenance and operating costs.

[0024] This embodiment of an automatic air-washing, non-powered ultrafiltration membrane water purification device has three parts: first, filtering and purifying the raw water; second, periodic air wiping of the ultrafiltration membrane module 4 by the aeration box 5 in the ultrafiltration membrane tank 3; and third, when the sealed water tank 10 siphons water, the concentrated water at the bottom of the ultrafiltration membrane tank 3 flows back into the sealed water tank 10 through the air pipe 11 and is then discharged with the siphon, thus realizing the function of partially discharging concentrated water without power.

[0025] Regarding the filtration and purification of raw water, the working principle is as follows: Tap water is supplied to the ultrafiltration membrane tank 3 via the inlet pipe 1. This tap water serves as the raw water. Upon entering the ultrafiltration membrane tank 3, a liquid level difference is created between the inside and outside of the ultrafiltration membrane module 4, thereby achieving filtration of the raw water. The filtered product water can then be discharged through the drain pipe 15. In this embodiment, it is conceivable that the flow of raw water into the ultrafiltration membrane tank 3 can be controlled by adjusting the opening and closing of the membrane tank inlet valve 2, and the flow rate of the raw water entering the ultrafiltration membrane tank 3 can also be adjusted by adjusting the opening degree of the membrane tank inlet valve 2.

[0026] The working principle of the aeration box 5 for periodic air scouring of the ultrafiltration membrane module 4 is as follows: Initially, the sealed water tank 10 has no water or a small amount of water, and the water level is lower than the height of the bottom outlet of the sealed water tank 10 connected to the siphon riser pipe 12. The inlet pipe 1 continuously injects water into the sealed water tank 10 to raise the water level. During this process, the gas in the sealed water tank 10 is compressed to a certain extent. The compressed gas has the ability to overcome the water pressure in the ultrafiltration membrane box 3 and enter the aeration box 5. That is, the air in the sealed water tank 10 gradually enters the aeration box 5 and is accumulated. As the water volume increases, when the amount of gas accumulated in the aeration box 5 reaches a certain level, the aeration box 5 aerates, achieving one air scouring of the ultrafiltration membrane module 4. One possible implementation is that, as the water volume increases, the aeration box 5 can continuously repeat the process of accumulating gas to aeration scouring, thus achieving periodic air scouring of the ultrafiltration membrane module 4. Furthermore, during the aforementioned process, since the siphon riser pipe 12 is always connected to the bottom outlet of the sealed water tank 10, the liquid level inside the siphon riser pipe 12 will continuously rise. As the inflow of water further increases, the liquid level inside the siphon riser pipe 12 reaches its highest level and enters the siphon downcomer pipe 13, achieving a siphon effect. This causes the water inside the sealed water tank 10 to be drawn out, while the one-way air inlet valve 9 automatically introduces air to balance the air pressure. When the liquid level inside the sealed water tank 10 drops to the bottom of the siphon pipe, the siphon effect stops due to the parallel air pressure, and the single operating cycle of the sealed water tank 10 ends. After the sealed water tank 10 returns to its initial state, the inlet pipe 1 continues to supply water to the sealed water tank 10, and the above process can be repeated periodically. In another understandable embodiment, the aeration cycle of the aeration box 5 can be consistent with the aforementioned siphon cycle of the sealed water tank 10, forming periodic air scouring; the aeration cycle of the aeration box 5 can also be inconsistent with the aforementioned siphon cycle of the sealed water tank 10, for example, multiple aeration cycles of the aeration box 5 can be formed within one aforementioned siphon cycle. In summary, this embodiment ultimately achieves periodic air scouring of the ultrafiltration membrane module 4 by the aeration box 5 without power consumption.

[0027] As can be seen from the aforementioned working principle, the sealed water tank 10 is in the siphon drainage mode. During the siphon drainage process of the sealed water tank 10, the concentrated water at the bottom of the ultrafiltration membrane box 3 flows back into the sealed water tank 10 through the vent pipe 11 and is then discharged with the siphon, thus realizing the function of partially discharging concentrated water without power.

[0028] In one embodiment, the volume obtained by multiplying the height difference between the top of the siphon riser 12 and the liquid level inside the ultrafiltration membrane tank 3 by the cross-sectional area of ​​the sealed water tank 10 is the total volume of a single aeration. The structure of the aeration box 5 itself can ensure that sufficient bubble size and aeration flushing volume are generated during aeration. Generally, the aeration volume is not adjusted within the equipment, but in conceivable embodiments, the total aeration volume can be adjusted by raising the sealed water tank 10 or lowering the ultrafiltration membrane tank 3. Furthermore, it is conceivable that while the single aeration volume of the aeration box 5 remains constant, the aeration frequency can be adjusted by regulating the flow rate of water entering the sealed water tank 10, i.e., by adjusting the inlet water speed of the sealed water tank 10.

[0029] In this embodiment, the filtration and purification of raw water and the periodic air scouring of the ultrafiltration membrane module 4 by the aeration box 5 are two relatively independent processes, neither of which requires power consumption, and the water production of the ultrafiltration membrane box 3 is always in progress.

[0030] In this embodiment, a vent 16 is provided on the upper part of the sealed water tank 10. The vent 16 is connected to the aeration box 5 through a vent pipe 11. The height of the vent 16 is greater than the liquid level in the sealed water tank 10. This arrangement ensures that the air in the sealed water tank 10 is connected to the vent pipe 11. The height of the vent 16 is level with the top of the ultrafiltration membrane module 4 in the ultrafiltration membrane box 3. This allows the concentrated water at the bottom of the ultrafiltration membrane box 3 to flow back into the sealed water tank 10 during siphoning, and then be discharged from the equipment.

[0031] Additionally, a float switch 18 is installed on the connection path between the water inlet pipe 1 and the ultrafiltration membrane tank 3. The float switch 18 will respond to the changes in the liquid level in the ultrafiltration membrane tank 3. When the liquid level reaches the overflow height, the float switch 18 can block the water supply from the water inlet pipe 1 to the ultrafiltration membrane tank 3, thereby ensuring that the water in the ultrafiltration membrane tank 3 does not overflow.

[0032] In this embodiment, a drain valve 14 is provided on the drain pipe 15. The drain valve 14 is used to control the flow of unfiltered raw water and wastewater in the ultrafiltration membrane box 3.

[0033] Furthermore, a product water flow control valve 7 is provided on the product water pipe 6 in this embodiment. In this embodiment, the product water flow control valve 7 is used to control the on / off state and magnitude of the product water flow in the ultrafiltration membrane tank 3. In addition, in conjunction with the membrane tank inlet valve 2, the operator can further adjust the liquid level difference in the ultrafiltration membrane tank 3 by controlling the opening degree of the product water flow control valve 7 and the membrane tank inlet valve 2, thereby further adjusting the product water flow of the ultrafiltration membrane tank 3.

[0034] To ensure that the gas in the sealed water tank 10 is forced into the aeration box 5 in the ultrafiltration membrane tank 3, the liquid level pressure of the ultrafiltration membrane tank 3 needs to be overcome. Therefore, the gas pressure in the sealed water tank 10 is positive. Since both the ultrafiltration membrane tank 3 and the siphon riser 12 are connected to the atmosphere, if the vertical height of the siphon riser 12 is too low, water will be directly discharged from the siphon when it is pressurized or when the amount of water flowing into the sealed water tank 10 is not large. Therefore, in this embodiment, the vertical height of the siphon riser 12 also needs to be greater than the liquid level height in the ultrafiltration membrane tank 3. In a preferred embodiment, the vertical height of the siphon riser 12 can be 1.2 to 2 times the liquid level height in the ultrafiltration membrane tank 3.

[0035] Example 2

[0036] Combined with appendix Figure 1 The automatic air-washing, non-powered ultrafiltration membrane water purification device of this embodiment, compared with the technical solution of Embodiment 1, can be improved as follows: the water pressure in the inlet pipe 1 is greater than 0.05 MPa. Further, in a more preferred embodiment, the water pressure in the inlet pipe 1 can be 0.1–0.6 MPa.

[0037] The inlet pipe 1 is used to supply water to the sealed water tank 10 and the ultrafiltration membrane box 3. During the process of supplying water to the sealed water tank 10 through the inlet pipe 1, the water will be subjected to the gas pressure generated by the rise of the liquid level in the sealed water tank 10. This gas pressure is generally required to ensure that the gas in the sealed water tank 10 can be forced into the ultrafiltration membrane box 3, that is, to overcome the liquid level pressure of the ultrafiltration membrane box 3. It is a positive pressure. In order to ensure water supply, the water pressure in the inlet pipe 1 should be greater than the gas pressure. Therefore, in this embodiment, the water pressure in the inlet pipe 1 is set as described above to ensure that the water supply can flow by gravity.

[0038] Example 3

[0039] Combined with appendix Figure 1 The automatic air-washing non-powered ultrafiltration membrane water purification device of this embodiment can be improved as follows compared with the technical solution of embodiment 1 or 2: the ultrafiltration membrane module 4 is immersed in the ultrafiltration membrane tank 3 at a depth of 0.1-0.3m below the liquid surface.

[0040] In this embodiment, the ultrafiltration membrane module 4 should be submerged below the liquid surface. Preferably, it is submerged 0.1-0.3m below the liquid surface of the ultrafiltration membrane tank 3 to facilitate future maintenance.

[0041] Example 4

[0042] Combined with appendix Figure 1 The automatic air-washing, non-powered ultrafiltration membrane water purification device of this embodiment, compared with any one of the technical solutions in embodiments 1-3, can be improved as follows: the filtration pore size of the ultrafiltration membrane module 4 is 0.03-0.1 micrometers; the water production flux of the ultrafiltration membrane module 4 is 5-15 L / (m³). 2 ·h).

[0043] This embodiment represents a preferred configuration of the ultrafiltration membrane module 4, wherein the filtration pore size is 0.03–0.1 micrometers to ensure the quality of the produced water. The permeate flux of the ultrafiltration membrane module 4 is set to 5–15 L / (m³). 2 ·h) can ensure the stability of the continuous operation of the ultrafiltration membrane module 4.

[0044] Example 5

[0045] Combined with appendix Figure 1 The automatic air-washing non-powered ultrafiltration membrane water purification device of this embodiment can be improved as follows compared with any of the technical solutions in embodiments 1-4: the air-washing cycle of the aeration box 5 is 5-15 minutes.

[0046] Since the automatic air-washing non-powered ultrafiltration membrane water purification equipment of this embodiment is usually used in rural drinking water purification scenarios where water quality fluctuates greatly, the air-washing cycle is set to 5-15 minutes in this embodiment. If the air-washing cycle is too short, it will be uneconomical, and if it is too long, the air-washing effect will be poor.

[0047] In a conceivable implementation, the air washing cycle of the aeration box 5 can be achieved by adjusting the opening of the inlet valve 8 inside the tank. The change in the opening of the inlet valve 8 inside the tank can adjust the inlet flow rate of the water inlet pipe 1 into the sealed water tank 10, thereby adjusting the air washing cycle of the aeration box 5.

[0048] Example 6

[0049] Combined with appendix Figure 1 The automatic air-washing, non-powered ultrafiltration membrane water purification device of this embodiment can be improved as follows compared with any of the technical solutions in embodiments 1-5: a water jet injector is provided on the communication path between the water inlet pipe and the sealed water tank. In this embodiment, a water jet injector 17 is provided on the communication path between the water inlet pipe 1 and the sealed water tank 10. Thus, when water flows through the water jet injector 17, some gas will simultaneously enter the sealed water tank 10, thereby increasing the gas volume in the sealed water tank 10, improving the aeration efficiency, and thus improving the efficiency of air scrubbing.

[0050] Example 7

[0051] Combined with appendix Figure 1Compared with any of the technical solutions in embodiments 1-6, the automatic air-washing non-powered ultrafiltration membrane water purification device of this embodiment can be improved as follows: A siphon auxiliary pipe is provided on one side of the siphon downpipe 13, and the siphon auxiliary pipe is arranged parallel to the siphon downpipe 13. One end of the siphon auxiliary pipe is connected to the siphon riser pipe 12. In this embodiment, the siphon auxiliary pipe and the siphon downpipe 12 have similar functions, both used for the downward drainage of siphon water flow. In a conceivable implementation, the siphon auxiliary pipe is provided with an interface for communication with the outside. When the negative pressure device is connected to the interface, or when negative pressure is generated at the interface, the generated negative pressure can be used to control the water in the sealed water tank 10 to enter the siphon riser pipe, thereby realizing the control of the siphon process of the device.

[0052] Example 8

[0053] Combined with appendix Figure 1 The automatic air-washing, non-powered ultrafiltration membrane water purification device of this embodiment can be improved as follows compared with any of the technical solutions in embodiments 1-7: the aeration box 5 is a large-pore pulse aeration box 5. In this embodiment, it is preferable to use a large-pore pulse aeration box 5, which can better achieve air wiping of the ultrafiltration membrane module 4.

[0054] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An automatic air-washing, non-powered ultrafiltration membrane water purification device, characterized in that, It includes an inlet pipe, a sealed water tank and an ultrafiltration membrane box respectively connected to the inlet pipe; an inlet valve is provided on the connection path between the inlet pipe and the sealed water tank; a membrane box inlet valve and a float switch are provided on the connection path between the inlet pipe and the ultrafiltration membrane box. The ultrafiltration membrane box is equipped with an ultrafiltration membrane module and an aeration box. The aeration box is located below the ultrafiltration membrane module. The ultrafiltration membrane module discharges product water through a product water pipe. A product water flow control valve is installed on the product water pipe. The ultrafiltration membrane box discharges water through a drain pipe. A drain valve is installed on the drain pipe. The sealed water tank is provided with an air vent at the top. The air vent is connected to the aeration box through an air vent pipe. The height of the air vent is greater than the liquid level in the sealed water tank and the height of the air vent is level with the top of the ultrafiltration membrane module in the ultrafiltration membrane box. The sealed water tank is provided with a one-way air inlet valve at the top. It also includes a siphon downpipe and a siphon uppipe. One end of the siphon uppipe is connected to the bottom outlet of the sealed water tank, and the other end of the siphon uppipe is connected to the upper part of the siphon downpipe. The vertical height of the siphon uppipe is greater than the liquid level in the ultrafiltration membrane tank.

2. The automatic air-washing, non-powered ultrafiltration membrane water purification device according to claim 1, characterized in that, The vertical height of the siphon riser is 1.2 to 2 times the liquid level in the ultrafiltration membrane tank.

3. The automatic air-washing, non-powered ultrafiltration membrane water purification device according to claim 1, characterized in that, The water pressure inside the inlet pipe is greater than 0.05 MPa.

4. The automatic air-washing, non-powered ultrafiltration membrane water purification device according to claim 3, characterized in that, The water pressure in the inlet pipe is 0.1 to 0.6 MPa.

5. The automatic air-washing, non-powered ultrafiltration membrane water purification device according to claim 1, characterized in that, The ultrafiltration membrane module is submerged 0.1 to 0.3 m below the liquid level in the ultrafiltration membrane tank.

6. The automatic air-washing, non-powered ultrafiltration membrane water purification device according to claim 1, characterized in that, The ultrafiltration membrane module has a filtration pore size of 0.03–0.1 micrometers; the ultrafiltration membrane module has a permeate flux of 5–15 L / (m³). 2 ·h).

7. The automatic air-washing, non-powered ultrafiltration membrane water purification device according to claim 1, characterized in that, The air washing cycle of the aeration box is 5 to 15 minutes.

8. The automatic air-washing, non-powered ultrafiltration membrane water purification device according to claim 1, characterized in that, A water jet is installed on the connection path between the water inlet pipe and the sealed water tank.

9. The automatic air-washing, non-powered ultrafiltration membrane water purification device according to claim 1, characterized in that, A siphon auxiliary pipe is provided on one side of the siphon downpipe. The siphon auxiliary pipe is arranged parallel to the siphon downpipe, and one end of the siphon auxiliary pipe is connected to the siphon uppipe.

10. The automatic air-washing, non-powered ultrafiltration membrane water purification device according to claim 1, characterized in that, The aeration box is a large-pore pulse aeration box.

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