Ultrafiltration system

Abstract

The utility model relates to the technical field of filtration, in particular to an ultrafiltration system which comprises an ultrafiltration column, and the ultrafiltration column is provided with an inlet end, a backflow end, an upper permeation end and a lower permeation end. One end of the liquid inlet pipe is used for being connected with an ultrafiltration buffer system, the other end of the liquid inlet pipe is communicated with the inlet end, and a liquid inlet pump is installed on the liquid inlet pipe; one end of the return pipe is connected with the ultrafiltration buffer system, and the other end of the return pipe is communicated with the return end; one end of the cleaning water return pipe is communicated with the liquid inlet pipe, and the other end of the cleaning water return pipe is connected with an ultrafiltration buffer system; the penetrating pipeline is communicated with the upper penetrating end; the wastewater discharge pipe is communicated with the lower permeation end, the permeation pipeline and the return pipe; one end of the backflow discharge pipe is communicated with the backflow pipe, and the other end of the backflow discharge pipe is communicated with the permeation pipeline. The ultrafiltration column can be self-cleaned, the ultrafiltration column does not need to be manually dismantled for cleaning, the cleaning efficiency is effectively improved, and the downtime of equipment is shortened.

Description

Technical Field

[0001] This application relates to the field of filtration technology, and particularly to an ultrafiltration system. Background Art

[0002] Ultrafiltration technology is an important separation method applied in fields such as water treatment, food processing, and biopharmaceuticals. This technology uses a pressure difference to pass the raw liquid through a semipermeable membrane with a specific pore size, achieving efficient removal of suspended solids, colloids, macromolecular organic matter, and microorganisms. Among numerous ultrafiltration devices, ultrafiltration columns are widely adopted due to their compact structure and convenient operation.

[0003] However, ultrafiltration columns in the prior art generally have a significant defect: the lack of an effective automatic cleaning system. This problem seriously affects the efficiency of the ultrafiltration process and the service life of the equipment. Specifically, it is manifested in the following aspects:

[0004] Increased membrane fouling: During the ultrafiltration process, pollutants such as suspended solids and organic matter will inevitably accumulate on the membrane surface, forming a concentration polarization layer and a gel layer. Due to the lack of an automatic cleaning mechanism, these pollutants are difficult to remove effectively in a timely manner, resulting in a continuous increase in the degree of membrane fouling.

[0005] Flux decline: With the accumulation of pollutants on the membrane surface, the effective filtration area of the ultrafiltration membrane decreases, resulting in a significant decline in membrane flux. In severe cases, it may lead to a substantial reduction in the efficiency of the entire filtration process or even complete failure.

[0006] Increased energy consumption: The increased resistance caused by membrane fouling requires the system to provide a higher transmembrane pressure to maintain the target flux. This directly leads to an increase in energy consumption and raises the operating cost.

[0007] Frequent shutdown for cleaning: Due to the lack of an automatic cleaning system, operators need to regularly stop the filtration process and disassemble the ultrafiltration column for manual cleaning. This not only increases the labor cost but also significantly reduces the effective working time of the equipment.

[0008] Uneven cleaning: Manual cleaning is difficult to ensure the uniformity and thoroughness of cleaning, and may result in insufficient cleaning of membrane elements in some areas, affecting the subsequent use effect.

[0009] Increased operation complexity: The lack of an automatic cleaning system means that more manual intervention and operation steps are required, increasing the operation complexity and the risk of errors. Summary of the Invention

[0010] This application aims to solve at least one of the above technical problems in the prior art to some extent. To this end, an embodiment of this application provides an ultrafiltration system that can self-clean the ultrafiltration column, eliminating the need for manual removal of the ultrafiltration column for cleaning, effectively improving the cleaning efficiency, reducing the equipment downtime, and increasing the effective working time of the equipment.

[0011] An ultrafiltration system, comprising:

[0012] An ultrafiltration column having an inlet end, a reflux end, an upper permeate end, and a lower permeate end;

[0013] A feed pipe, one end of which is used to connect to an ultrafiltration buffer system, the other end of which communicates with the inlet end, and a feed pump is installed on the feed pipe;

[0014] A reflux pipe, one end of which is used to connect to an ultrafiltration buffer system, the other end of which communicates with the reflux end;

[0015] A cleaning return pipe, one end of which is used to connect to an ultrafiltration buffer system, the other end of which communicates with the feed pipe;

[0016] A permeate pipe that communicates with the upper permeate end;

[0017] A waste water discharge pipe that communicates with the lower permeate end, the waste water discharge pipe communicates with the permeate pipe, and the waste water discharge pipe communicates with the reflux pipe;

[0018] A reflux discharge pipe, one end of which communicates with the reflux pipe and the other end communicates with the permeate pipe.

[0019] In an optional or preferred embodiment, the ultrafiltration system further includes a circulation pipe, one end of which communicates with the feed pipe and the other end communicates with the reflux pipe.

[0020] In an optional or preferred embodiment, multiple ultrafiltration columns are provided, the feed pipe communicates with the inlet ends of each ultrafiltration column through a first collecting pipe, and the reflux ends of each ultrafiltration column communicate with the reflux pipe through a second collecting pipe.

[0021] In an optional or preferred embodiment, the ultrafiltration system further includes a buffer tank, the permeate pipe communicates with the buffer tank, and the bottom of the buffer tank communicates with the waste water discharge pipe.

[0022] In an optional or preferred embodiment, the ultrafiltration system further includes a liquid transfer pipe, one end of which is connected to the feed pipe and the other end is directly used to connect to a production liquid storage tank.

[0023] In an alternative or preferred embodiment, the ultrafiltration system further includes a steam pipeline, the steam pipeline is connected to the reflux pipe, the condensate discharge pipe is connected to the cleaning return water pipe, and the steam pipeline is connected to the permeate pipeline.

[0024] In an alternative or preferred embodiment, the ultrafiltration system further includes a condensate discharge pipe, the condensate discharge pipe is connected to the feed pipe, the condensate discharge pipe is connected to the buffer tank, and the condensate discharge pipe is connected to the steam pipeline.

[0025] In an alternative or preferred embodiment, a first pressure sensor, a first conductivity sensor, and an electromagnetic flowmeter are provided on the reflux pipe.

[0026] In an alternative or preferred embodiment, a second pressure sensor, a second conductivity sensor, a mass flowmeter, and a pH sensor are provided on the permeate pipeline.

[0027] In an alternative or preferred embodiment, a sampling valve is further provided on the permeate pipeline.

[0028] Based on the above technical solutions, the embodiments of the present application have at least the following beneficial effects: In the above technical solutions, during the filtration process, the production liquid enters the feed pipe after passing through the ultrafiltration buffer system, enters the inlet end of the ultrafiltration column from the feed pipe, after being filtered by the ultrafiltration column, the wastewater is discharged from the wastewater discharge pipe through the lower permeate end, and the filtered production liquid enters the reflux pipe through the reflux end, and then flows back to the ultrafiltration buffer system again. The filtered water during the ultrafiltration process will flow out from the upper permeate end, pass through the permeate pipeline, and be discharged from the wastewater discharge pipe. When cleaning is required, the feed pump on the feed pipe starts to work, the cleaning water comes out from the ultrafiltration buffer system, enters the ultrafiltration column from the feed pipe through the inlet end, and the ultrafiltration column is cleaned by the full discharge method at the reflux end, the upper permeate end, and the lower permeate end, that is, the cleaning water entering the ultrafiltration column is discharged from the reflux end, the upper permeate end, and the lower permeate end. The cleaning water discharged from the reflux end flows through the reflux pipe, the reflux discharge pipe, and the permeate pipeline and is discharged from the wastewater discharge pipe. The cleaning water discharged from the upper permeate end flows through the permeate pipeline and is discharged from the wastewater discharge pipe. The cleaning water discharged from the lower permeate end is directly discharged from the wastewater discharge pipe, thereby completing the self-cleaning of the ultrafiltration column. When alkaline cleaning of the ultrafiltration system is required, the feed pump on the feed pipe starts to work. After the alkaline solution flows out from the ultrafiltration buffer system, its flow path in the ultrafiltration system is the same as the flow path of the above cleaning water. Such an ultrafiltration system can achieve self-cleaning of the ultrafiltration column, does not require manual removal of the ultrafiltration column for cleaning, effectively improves the cleaning efficiency, reduces the equipment downtime, and increases the effective working time of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present application will be further described below in conjunction with the drawings and embodiments;

[0030] Figure 1 It is a schematic diagram of the ultrafiltration system provided by the embodiments of the present application. Detailed implementation manners

[0031] In order to enable those skilled in the art to better understand the technical solutions in the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0032] The following further describes in detail the implementation manners of the present application with reference to the drawings and embodiments. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0033] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0035] In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0036] Ultrafiltration technology is an important separation method applied in fields such as water treatment, food processing, and biopharmaceuticals. This technology uses a pressure difference to pass the raw liquid through a semi-permeable membrane with a specific pore size, achieving efficient removal of suspended solids, colloids, macromolecular organic matter, and microorganisms. Among numerous ultrafiltration devices, ultrafiltration column 1 is widely adopted due to its compact structure and convenient operation.

[0037] However, ultrafiltration columns in the existing technology generally have a significant defect: the lack of an effective automatic cleaning system. This problem seriously affects the efficiency of the ultrafiltration process and the service life of the equipment. It is specifically manifested in the following aspects:

[0038] Increased membrane fouling: During the ultrafiltration process, pollutants such as suspended solids and organic matter will inevitably accumulate on the membrane surface, forming a concentration polarization layer and a gel layer. Due to the lack of an automatic cleaning mechanism, these pollutants are difficult to remove effectively and timely, resulting in a continuous increase in the degree of membrane fouling.

[0039] Flux decline: With the accumulation of pollutants on the membrane surface, the effective filtration area of the ultrafiltration membrane decreases, resulting in a significant decline in membrane flux. In severe cases, it may lead to a substantial reduction in the efficiency of the entire filtration process or even complete failure.

[0040] Increased energy consumption: The increased resistance caused by membrane fouling requires the system to provide a higher transmembrane pressure to maintain the target flux. This directly leads to an increase in energy consumption and an increase in operating costs.

[0041] Frequent shutdown for cleaning: Due to the lack of an automatic cleaning system, operators need to regularly stop the filtration process and disassemble ultrafiltration column 1 for manual cleaning. This not only increases labor costs but also significantly reduces the effective working time of the equipment.

[0042] Uneven cleaning: Manual cleaning is difficult to ensure the uniformity and thoroughness of cleaning, and may result in insufficient cleaning of membrane elements in some areas, affecting subsequent use effects.

[0043] Increased operation complexity: The lack of an automatic cleaning system means that more manual intervention and operation steps are required, increasing the operation complexity and the risk of errors.

[0044] Refer to Figure 1 This application provides an ultrafiltration system, including ultrafiltration column 1, feed pipe 2, return pipe 3, cleaning return pipe 4, permeate pipe 5, return discharge pipe 6, and waste water discharge pipe 7.

[0045] The ultrafiltration column 1 has an inlet end 100, a reflux end 110, an upper permeate end 120 and a lower permeate end 130. One end of the feed pipe 2 is used to connect to the ultrafiltration buffer system, and the other end of the feed pipe 2 communicates with the inlet end 100. A feed pump 200 is installed on the feed pipe 2. One end of the reflux pipe 3 is used to connect to the ultrafiltration buffer system, and the other end of the reflux pipe 3 communicates with the reflux end 110. One end of the cleaning return pipe 4 is used to connect to the ultrafiltration buffer system, and the other end of the cleaning return pipe 4 communicates with the feed pipe 2. The permeate pipe 5 communicates with the upper permeate end 120, and the waste water discharge pipe 7 communicates with the lower permeate end 130. The waste water discharge pipe 7 communicates with the permeate pipe 5, and the waste water discharge pipe 7 communicates with the reflux pipe 3. One end of the reflux discharge pipe 6 communicates with the reflux pipe 3, and the other end communicates with the permeate pipe 5.

[0046] During the filtration process, the production feed liquid enters the feed pipe 2 after passing through the ultrafiltration buffer system, enters the inlet end 100 of the ultrafiltration column 1 from the feed pipe 2. After being filtered by the ultrafiltration column 1, the waste water is discharged from the waste water discharge pipe 7 through the lower permeate end 130. The filtered production feed liquid enters the reflux pipe 3 through the reflux end 110 and then flows back to the ultrafiltration buffer system. The filtered water during the ultrafiltration process will flow out from the upper permeate end 120, pass through the permeate pipe 5 and be discharged from the waste water discharge pipe 7. When cleaning is required, the feed pump 200 on the feed pipe 2 starts to work. After the cleaning water passes through the ultrafiltration buffer system, it enters the ultrafiltration column 1 from the inlet end 100 through the feed pipe 2. The ultrafiltration column 1 is cleaned by the full discharge method of the reflux end 110, the upper permeate end 120 and the lower permeate end 130, that is, the cleaning water entering the ultrafiltration column 1 is completely discharged from the reflux end 110, the upper permeate end 120 and the lower permeate end 130. The cleaning water discharged from the reflux end 110 flows through the reflux pipe 3, the reflux discharge pipe 6 and the permeate pipe 5 and is discharged from the waste water discharge pipe 7. The cleaning water discharged from the upper permeate end 120 flows through the permeate pipe 5 and is discharged from the waste water discharge pipe 7. The cleaning water discharged from the lower permeate end 130 is directly discharged from the waste water discharge pipe 7, thus completing the self-cleaning of the ultrafiltration column 1. When the ultrafiltration system needs to be cleaned with lye, the feed pump 200 on the feed pipe 2 starts to work. After the lye flows out through the ultrafiltration buffer system, its flow path in the ultrafiltration system is the same as that of the above cleaning water. This ultrafiltration system can realize the self-cleaning of the ultrafiltration column 1, does not require manual removal of the ultrafiltration column 1 for cleaning, effectively improves the cleaning efficiency, reduces the equipment downtime, and improves the effective working time of the equipment.

[0047] In some embodiments, the ultrafiltration system further includes a circulation pipeline 8. One end of the circulation pipeline 8 is connected to the liquid inlet pipe 2, and the other end is connected to the return pipe 3. During the process of configuring the lye in the ultrafiltration buffer system, it is not necessary for the lye to pass through the ultrafiltration column 1. Therefore, when the ultrafiltration buffer system configures the lye, under the operation of the liquid inlet pump 200, after the mixed solution of the lye and clear water flows out of the ultrafiltration buffer system, it passes through the liquid inlet pipe 2 and the circulation pipeline 8, and then returns to the ultrafiltration buffer system from the return pipe 3, realizing the circulating flow of the mixed solution of the lye and clear water between the ultrafiltration buffer system and the ultrafiltration system, so as to make the mixing of the lye and clear water more uniform.

[0048] In some embodiments, multiple ultrafiltration columns 1 are provided. The liquid inlet pipe 2 is connected to the inlet ends 100 of each ultrafiltration column 1 through a first liquid collecting pipe 9, and the return ends 110 of each ultrafiltration column 1 are connected to the return pipe 3 through a second liquid collecting pipe 10. In this way, filtering work through multiple ultrafiltration columns 1 can improve the filtering efficiency.

[0049] In addition, the upper permeation ends 120 of each ultrafiltration column 1 are connected to the permeation pipeline 5 through a third liquid collecting pipe 11, and the lower permeation ends 130 of each ultrafiltration column 1 are connected to the wastewater discharge pipe 7 through a fourth liquid collecting pipe 12.

[0050] In some embodiments, the ultrafiltration system further includes a buffer tank 13. The permeation pipeline 5 is connected to the buffer tank 13, and the bottom of the buffer tank 13 is connected to the wastewater discharge pipe 7.

[0051] Specifically, the bottom of the buffer tank 13 is connected to the wastewater discharge pipe 7 through a third liquid collecting pipe 12. The liquid flowing out of the permeation pipeline 5 first passes through the buffer tank 13 for buffering, and then is discharged from the wastewater discharge pipe 7 after passing through the buffer tank 13.

[0052] In some embodiments, the ultrafiltration system further includes a feed liquid transfer pipeline 14. One end of the feed liquid transfer pipeline 14 is connected to the liquid inlet pipe 2, and the other end is used to connect to the production feed liquid storage tank. When it is necessary to transfer the production feed liquid, the production feed liquid entering the liquid inlet pipe 2 is directly transferred to the production feed liquid storage tank for storage through the feed liquid transfer pipeline 14.

[0053] In some embodiments, a first pressure sensor 300, a first conductivity sensor 310, and an electromagnetic flowmeter 320 are provided on the return pipe 3. The first pressure sensor 300, the first conductivity sensor 310, and the electromagnetic flowmeter 320 are respectively used to monitor the pressure, conductivity, and flow rate of the liquid flowing in the return pipe 3 to monitor the cleaning situation in real time.

[0054] In some embodiments, a second pressure sensor 500, a second conductivity sensor 510, a mass flow meter 520, and a pH sensor 530 are provided on the permeate pipe 5. The second pressure sensor 500, the second conductivity sensor 510, the mass flow meter 520, and the pH sensor 530 are respectively used to measure the pressure, conductivity, flow rate, and pH value of the flowing liquid in the permeate pipe 5. When the cleaning of the ultrafiltration system reaches the set requirements of the second pressure sensor 500, the second conductivity sensor 510, the mass flow meter 520, and the second pH sensor 530, the cleaning procedure of the ultrafiltration column 1 ends.

[0055] In some embodiments, a sampling valve is further provided on the permeate pipe 5 for convenient sampling.

[0056] In some embodiments, the ultrafiltration system further includes a steam pipe 15. The steam pipe 15 is connected to the reflux pipe 3 and the steam pipe 15 is connected to the permeate pipe 5.

[0057] In some embodiments, the ultrafiltration system further includes a condensate drain pipe 16. The condensate drain pipe 16 is connected to the feed pipe 2, the condensate drain pipe 16 is connected to the cleaning return pipe 4, the condensate drain pipe 16 is connected to the buffer tank 13, and the condensate drain pipe 16 is connected to the steam pipe 15.

[0058] During the sterilization process, the high-temperature steam enters the steam pipe 15 after passing through the ultrafiltration buffer system. The high-temperature steam passes through the reflux pipe 3, the circulation pipe 8, the cleaning return pipe 4, and the feed pipe 2 to perform high-temperature sterilization on the reflux pipe 3, the circulation pipe 8, the cleaning return pipe 4, and the feed pipe 2. The sterilized condensate is discharged from the condensate drain pipe 16. The high-temperature steam passes through the permeate pipe 5 and the buffer tank 13 to perform high-temperature sterilization on the permeate pipe 5 and the buffer tank 13. The sterilized condensate is discharged from the bottom of the buffer tank 13 through the condensate drain pipe 16.

[0059] Furthermore, steam traps are installed on the connecting pipes connecting the condensate drain pipe 16 and the feed pipe 2, on the connecting pipes connecting the condensate drain pipe 16 and the cleaning return pipe 4, on the connecting pipes connecting the condensate drain pipe 16 and the buffer tank 13, and on the connecting pipes connecting the condensate drain pipe 16 and the steam pipe 15. The condensate is discharged to the condensate drain pipe 16 through the steam traps.

[0060] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0061] The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. An ultrafiltration system, characterized in that: include: An ultrafiltration column, the ultrafiltration column having an inlet end, a reflux end, an upper permeate end and a lower permeate end; A liquid inlet pipe, one end of which is used to connect to the ultrafiltration buffer system, the other end of which is connected to the inlet end, and a liquid inlet pump is installed on the liquid inlet pipe; A reflux pipe, one end of which is used to connect to the ultrafiltration buffer system, and the other end of which is connected to the reflux end; A cleaning water return pipe, one end of which is used to connect to the ultrafiltration buffer system, and the other end of which is connected to the liquid inlet pipe; a permeate pipe, the permeate pipe being connected to the upper permeate end; A wastewater discharge pipe, the wastewater discharge pipe is connected to the lower permeate end, the wastewater discharge pipe is connected to the permeate pipe, and the wastewater discharge pipe is connected to the reflux pipe; A reflux discharge pipe, one end of which is connected to the reflux pipe, and the other end of which is connected to the permeate pipe.

2. The ultrafiltration system according to claim 1, characterized in that: The ultrafiltration system further comprises a circulation pipeline, one end of which is connected to the liquid inlet pipe, and the other end of which is connected to the reflux pipe.

3. The ultrafiltration system according to claim 1, characterized in that: A plurality of ultrafiltration columns are provided, the liquid inlet pipe is connected to the inlet end of each ultrafiltration column through a first liquid collecting pipe, and the reflux end of each ultrafiltration column is connected to the reflux pipe through a second liquid collecting pipe.

4. The ultrafiltration system according to claim 1, characterized in that: The ultrafiltration system further comprises a buffer tank, the permeate pipeline is connected to the buffer tank, and the bottom of the buffer tank is connected to the wastewater discharge pipe.

5. The ultrafiltration system according to claim 1, characterized in that: The ultrafiltration system also includes a feed liquid transfer pipeline, one end of which is connected to the liquid inlet pipe, and the other end of which is directly used to connect to the production feed liquid storage tank.

6. The ultrafiltration system according to claim 4, characterized in that: The ultrafiltration system further comprises a steam pipeline, wherein the steam pipeline is connected to the reflux pipe, and the steam pipeline is connected to the permeate pipe.

7. The ultrafiltration system according to claim 6, characterized in that: The ultrafiltration system also includes a condensate discharge pipe, which is connected to the liquid inlet pipe, the condensate discharge pipe is connected to the cleaning return pipe, the condensate discharge pipe is connected to the buffer tank, and the condensate discharge pipe is connected to the steam pipe.

8. The ultrafiltration system according to claim 1, characterized in that: The reflux pipe is provided with a first pressure sensor, a first conductivity sensor and an electromagnetic flowmeter.

9. The ultrafiltration system according to claim 1, characterized in that: The permeation pipeline is provided with a second pressure sensor, a second conductivity sensor, a mass flow meter and a pH sensor.

10. The ultrafiltration system according to claim 1, characterized in that: The permeation pipeline is also provided with a sampling valve.

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