Ultrafiltration system

Abstract

The utility model relates to the technical field of filtration, and discloses an ultrafiltration system which comprises a stock solution container, a filter membrane assembly, a feeding pipeline, a first discharging pipeline, a second discharging pipeline, a first circulating branch and a second circulating branch, the feeding pipeline is connected between the stock solution container and the filter membrane assembly; the first discharging pipeline is connected with the filter membrane assembly; the second discharging pipeline is connected with the filter membrane assembly and used for discharging the concentrated solution, and a first valve is arranged on the second discharging pipeline; one end of the first circulation branch is connected with the feeding pipeline, the other end of the first circulation branch is connected to the second discharging pipeline between the first valve and the filter membrane assembly, and a second valve is arranged on the first circulation branch; one end of the second circulation branch is connected with the stock solution container, the other end of the second circulation branch is connected to the second discharging pipeline between the first valve and the filter membrane assembly, and a third valve is arranged on the second circulation branch. The trend of the concentrated solution discharged by the filter membrane assembly can be selected, the flexible treatment capacity of the system is improved, and the operation efficiency of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration, in particular to an ultrafiltration system. Background Art

[0002] Ultrafiltration is a pressure-driven membrane separation technology. During the ultrafiltration process, an aqueous solution flows through the membrane surface under the push of pressure. Solvents and small solute molecules smaller than the membrane pores pass through the filter membrane to become the filtrate, and solutes larger than the membrane pores are intercepted and discharged with the water flow to become the concentrated solution. Currently, in existing ultrafiltration systems, the liquid after passing through the filter membrane generally can only flow back to the original water tank or the concentrated water tank, and it is impossible to realize an internal closed loop for repeating the ultrafiltration process, resulting in low operating efficiency. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an ultrafiltration system to solve the problem in the prior art that the repeated ultrafiltration process cannot be realized, resulting in low operating efficiency.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides an ultrafiltration system, including:

[0006] A stock solution container;

[0007] A filter membrane assembly;

[0008] A feed pipeline, connected between the stock solution container and the filter membrane assembly to supply the stock solution to the filter membrane assembly;

[0009] A first discharge pipeline, connected to the filter membrane assembly for discharging the filtrate;

[0010] A second discharge pipeline, connected to the filter membrane assembly for discharging the concentrated solution, and a first valve member is provided on the second discharge pipeline;

[0011] A first circulation branch, one end of which is connected to the feed pipeline, and the other end is connected to the second discharge pipeline between the first valve member and the filter membrane assembly, and a second valve member is provided on the first circulation branch; and

[0012] A second circulation branch, one end of which is connected to the stock solution container, and the other end is connected to the second discharge pipeline between the first valve member and the filter membrane assembly, and a third valve member is provided on the second circulation branch;

[0013] The first circulation branch and the second circulation branch are in parallel.

[0014] In some embodiments, the ultrafiltration system further includes a first pressure detection element and a controller. The first pressure detection element is disposed on the feed pipeline, and the first pressure detection element, the first valve member, the second valve member, and the third valve member are respectively electrically connected to the controller.

[0015] In some embodiments, the ultrafiltration system further includes a first turbidity detector, which is disposed on the second discharge pipeline and is electrically connected to the controller.

[0016] In some embodiments, the filter membrane assembly has a first liquid passing port, a second liquid passing port, and a clear liquid outlet. The first discharge pipeline is connected to the clear liquid outlet;

[0017] The ultrafiltration system further includes a third circulation branch, a fourth circulation branch, a fifth circulation branch, and a sixth circulation branch. The third circulation branch connects the first liquid passing port to the feed pipeline, and the fourth circulation branch connects the second liquid passing port to the feed pipeline; the fifth circulation branch connects the first liquid passing port to the second discharge pipeline, and the sixth circulation branch connects the second liquid passing port to the second discharge pipeline;

[0018] Valve members are provided on the third circulation branch, the fourth circulation branch, the fifth circulation branch, and the sixth circulation branch.

[0019] In some embodiments, a second pressure detection element is provided at the first liquid passing port, and a third pressure detection element is provided at the second liquid passing port.

[0020] In some embodiments, the ultrafiltration system further includes a first flow detection element, a second flow detection element, and a delivery pump. The first flow detection element and the delivery pump are respectively disposed on the feed pipeline, and the second flow detection element is disposed on the first circulation branch and the second circulation branch.

[0021] In some embodiments, the ultrafiltration system further includes a collecting pipe. The first circulation branch and the second circulation branch are both connected to one end of the collecting pipe, and the other end of the collecting pipe is connected to the second discharge pipeline. The second flow detection element is disposed on the collecting pipe, and a regulating valve is further provided on the collecting pipe.

[0022] In some embodiments, the ultrafiltration system further includes a second turbidity detector, which is disposed on the first discharge pipeline.

[0023] In some embodiments, the ultrafiltration system further includes a buffer tank, which is disposed on the feed pipeline between the first circulation branch and the filter membrane assembly.

[0024] In some embodiments, the ultrafiltration system further includes a supernatant collection container and a concentrate collection container. The supernatant collection container is connected to the first discharge pipeline, and the concentrate collection container is connected to the second discharge pipeline.

[0025] Compared with the prior art, the ultrafiltration system according to the embodiment of the present invention has the following beneficial effects:

[0026] In the ultrafiltration system according to the embodiment of the present invention, the stock solution is supplied to the membrane filtration module through the feed pipeline, and the stock solution is filtered by the membrane filtration module. The clarified liquid obtained by the membrane filtration module is discharged through the first discharge pipeline, and the concentrate obtained by the membrane filtration module can be directly discharged through the second discharge pipeline. Since the second discharge pipeline is further connected with a first circulation branch and a second circulation branch, and the first circulation branch and the second circulation branch are in parallel, the concentrate in the second discharge pipeline can be discharged into the feed pipeline through the first circulation branch, and then enter the membrane filtration module through the feed pipeline, realizing the repeated ultrafiltration process of the single concentrate; the concentrate in the second discharge pipeline can be discharged into the stock solution container through the second circulation branch, and after being mixed with the stock solution in the stock solution container, it enters the membrane filtration module through the feed pipeline again, realizing the repeated ultrafiltration process of the concentrate combined with the new stock solution. Therefore, according to the usage requirements, the present application can select the flow direction of the concentrate discharged by the membrane filtration module, which can be directly discharged, or the concentrate can be circulated and ultrafiltered in the internal small loop, or the concentrate can be circulated and ultrafiltered in the internal large loop in combination with the stock solution, improving the flexible processing ability of the system and the operation efficiency of the system. Moreover, by performing the repeated ultrafiltration process of the concentrate combined with the new stock solution, the utilization rate of the concentrate in the ultrafiltration process can be improved, and the output of the concentrate can be reduced. Description of the Drawings

[0027] Figure 1 is a schematic diagram of the ultrafiltration system according to the embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the inlet and outlet connections of the membrane filtration module according to the embodiment of the present invention.

[0029] Reference numerals in the drawings:

[0030] 10. Stock solution container;

[0031] 20. Membrane filtration module; 21. First liquid passing port; 211. Second pressure detection element; 22. Second liquid passing port; 221. Third pressure detection element; 23. Supernatant outlet; 24. Third circulation branch; 241. Fourth valve member; 25. Fourth circulation branch; 251. Fifth valve member; 26. Fifth circulation branch; 261. Sixth valve member; 27. Sixth circulation branch; 271. Seventh valve member;

[0032] 30. Feed pipeline; 31. First pressure detection element; 32. First flow detection element; 33. Transfer pump; 34. Buffer tank; 35. Feeding valve;

[0033] 40. First discharge pipeline; 41. Second turbidity detector; 42. Clear liquid collection container;

[0034] 50. Second discharge pipeline; 51. First valve member; 52. First turbidity detector; 53. Concentrated liquid collection container;

[0035] 60. First circulation branch; 61. Second valve member;

[0036] 70. Second circulation branch; 71. Third valve member;

[0037] 80. Manifold; 81. Second flow detection element; 82. Control valve; 83. Eighth valve member. Detailed implementation manners

[0038] In the description of the present utility model, it should be noted that the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0039] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] The following will further describe in detail the specific implementation manners of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model but are not used to limit the scope of the present utility model.

[0041] Refer to Figure 1 and Figure 2As shown in the figure, an embodiment of the present utility model provides an ultrafiltration system, which includes a stock solution container 10, a filter membrane module 20, a feed pipeline 30, a first discharge pipeline 40, a second discharge pipeline 50, a first circulation branch 60 and a second circulation branch 70. The stock solution container 10 is used to store the stock solution to be processed, and the stock solution container 10 is a tank body; the feed pipeline 30 is connected between the stock solution container 10 and the filter membrane module 20 to supply the stock solution to the filter membrane module 20; the first discharge pipeline 40 is connected to the filter membrane module 20 and is used to discharge the clarified liquid; the second discharge pipeline 50 is connected to the filter membrane module 20 and is used to discharge the concentrated liquid. A first valve member 51 is provided on the second discharge pipeline 50; one end of the first circulation branch 60 is connected to the feed pipeline 30, and the other end of the first circulation branch 60 is connected to the second discharge pipeline 50 between the first valve member 51 and the filter membrane module 20. A second valve member 61 is provided on the first circulation branch 60; one end of the second circulation branch 70 is connected to the stock solution container 10, and the other end is connected to the second discharge pipeline 50 between the first valve member 51 and the filter membrane module 20. A third valve member 71 is provided on the second circulation branch 70; the first circulation branch 60 and the second circulation branch 70 are in parallel.

[0042] The stock solution is filtered by the filter membrane module 20. The clarified liquid obtained by the treatment of the filter membrane module 20 is discharged through the first discharge pipeline 40, and the concentrated liquid obtained by the treatment of the filter membrane module 20 can be directly discharged through the second discharge pipeline 50. Since the first circulation branch 60 and the second circulation branch 70 are also connected to the second discharge pipeline 50 and the first circulation branch 60 and the second circulation branch 70 are in parallel, the concentrated liquid in the second discharge pipeline 50 can be discharged into the feed pipeline 30 through the first circulation branch 60, and then enter the filter membrane module 20 through the feed pipeline 30, realizing the repeated ultrafiltration process of the single concentrated liquid; through the second circulation branch 70, the concentrated liquid in the second discharge pipeline 50 can be discharged into the stock solution container 10. After being mixed with the stock solution in the stock solution container 10, it then enters the filter membrane module 20 through the feed pipeline 30, realizing the repeated ultrafiltration process of the concentrated liquid combined with the new stock solution. Therefore, in this application, the flow direction of the concentrated liquid discharged from the filter membrane module 20 can be selected according to the use requirements. It can be directly discharged, or the repeated ultrafiltration process of the concentrated liquid in the internal small loop can be carried out, or the repeated ultrafiltration process of the concentrated liquid combined with the stock solution in the internal large loop can be carried out, improving the flexible processing ability of the system and the operation efficiency of the system. Moreover, carrying out the repeated ultrafiltration process of the concentrated liquid combined with the new stock solution can improve the utilization rate of the concentrated liquid in the ultrafiltration process and reduce the output of the concentrated liquid.

[0043] Refer to Figure 1 As shown in the figure, the ultrafiltration system further includes a clarified liquid collection container 42. The clarified liquid collection container 42 is connected to the first discharge pipeline 40, and the clarified liquid collection container 42 is used to store the clarified liquid discharged from the first discharge pipeline 40. The clarified liquid collection container 42 is a tank body.

[0044] Refer toFigure 1 As shown, the ultrafiltration system further includes a concentrate collection container 53. The concentrate collection container 53 is connected to the second discharge pipeline 50, and the concentrate collection container 53 is used to store the concentrate directly discharged through the second discharge pipeline 50. The concentrate collection container 53 is a tank body. The on-off of the second discharge pipeline 50 between the filter membrane module 20 and the concentrate collection container 53 can be controlled by the first valve member 51, so as to control whether the concentrate in the second discharge pipeline 50 can be directly discharged into the concentrate collection container 53 for storage.

[0045] Refer to Figure 1 As shown, a feeding valve 35 is provided on the feeding pipeline 30, and the on-off between the feeding pipeline 30 and the stock solution container 10 is controlled by the feeding valve 35. In order to avoid the control of the feeding valve 35 affecting the first circulation branch 60, the feeding valve 35 is provided between the connection point of the first circulation branch 60 and the feeding pipeline 30 and the stock solution container 10.

[0046] Refer to Figure 1 As shown, in some embodiments, the ultrafiltration system further includes a first pressure detection element 31 and a controller. The first pressure detection element 31 is provided on the feeding pipeline 30. The first pressure detection element 31 is used to detect the feeding pressure in the feeding pipeline 30. The first pressure detection element 31 can be a pressure sensor, and is specifically arranged between the connection point of the first circulation branch 60 and the feeding pipeline 30 and the filter membrane module 20. The first pressure detection element 31, the first valve member 51, the second valve member 61 and the third valve member 71 are respectively electrically connected to the controller. When the first pressure detection element 31 detects that the pressure value in the feeding pipeline 30 is greater than the first set pressure threshold, it means that the operating pressure of the ultrafiltration system is too high. The controller controls the second valve member 61 and the third valve member 71 to close, and the first valve member 51 to open, so that the concentrate in the second discharge pipeline 50 is directly discharged to reduce the operating pressure of the system.

[0047] Refer to Figure 1As shown, in some embodiments, the ultrafiltration system further includes a first turbidity detector 52 disposed on the second discharge pipeline 50 and electrically connected to the controller. The first turbidity detector 52 is used to detect the turbidity value of the concentrated liquid in the second discharge pipeline 50. Specifically, the first turbidity detector 52 is disposed on the second discharge pipeline 50 between the first circulation branch 60, the second circulation branch 70 and the membrane module 20 to detect the turbidity value of the concentrated liquid just discharged from the membrane module 20. When the pressure value detected by the first pressure detection element 31 is less than or equal to the first set pressure threshold and the turbidity value of the concentrated liquid detected by the first turbidity detector 52 is less than the first set turbidity threshold, the first valve member 51 and the third valve member 71 are closed, and the second valve member 61 is opened to allow the concentrated liquid in the second discharge pipeline 50 to enter the feed pipeline 30 and then enter the membrane module 20 again through the feed pipeline 30 for treatment, performing the repeated ultrafiltration process of the concentrated liquid to improve the system operation efficiency. When the pressure value detected by the first pressure detection element 31 is less than or equal to the first set pressure threshold and the turbidity value of the concentrated liquid detected by the first turbidity detector 52 is greater than or equal to the first set turbidity threshold and less than or equal to the second turbidity threshold, the first valve member 51 and the second valve member 61 are closed, and the third valve member 71 is opened to allow the concentrated liquid in the second discharge pipeline 50 to enter the stock solution container 10. The concentrated liquid in the second discharge pipeline 50 is combined with new stock solution and then enters the membrane module 20 again through the feed pipeline 30 for treatment, performing the repeated ultrafiltration process of the concentrated liquid combined with new stock solution to improve the utilization rate of the concentrated liquid and reduce the output of the concentrated liquid. When the pressure value detected by the first pressure detection element 31 is less than or equal to the first set pressure threshold and the turbidity value of the concentrated liquid detected by the first turbidity detector 52 is greater than the second turbidity threshold, it indicates that the turbidity of the concentrated liquid is too high and not suitable for continued recycling. At this time, the second valve member 61 and the third valve member 71 are closed, and the first valve member 51 is opened to directly discharge the concentrated liquid in the second discharge pipeline 50.

[0048] Refer to Figure 1As shown, in some embodiments, the ultrafiltration system further includes a first flow detection element 32, a second flow detection element 81, and a delivery pump 33. The first flow detection element 32 and the delivery pump 33 are respectively arranged on the feed pipeline 30, and the second flow detection element 81 is arranged on the first circulation branch 60 and the second circulation branch 70. The feed flow rate in the feed pipeline 30 is detected by the first flow detection element 32. One second flow detection element 81 can be provided on each of the first circulation branch 60 and the second circulation branch 70, or the second flow detection element 81 can be arranged at the confluence of the first circulation branch 60 and the second circulation branch 70. The flow rate of the concentrated liquid circulating in the second discharge pipeline 50 is detected by the second flow detection element 81. Based on the detection results of the first flow detection element 32 and the second flow detection element 81, it is convenient to adjust the ratio of the feed flow rate to the circulating concentrated liquid flow rate, so that the system operates in a cyclic manner according to the set ratio. The first flow detection element 32 and the second flow detection element 81 can both be rotameters. In order to enable the delivery pump 33 to perform the function of pumping the feed during each repeated ultrafiltration process, the delivery pump 33 is arranged between the connection point of the first circulation branch 60 and the feed pipeline 30 and the membrane module 20.

[0049] Optionally, the ultrafiltration system further includes a collecting pipe 80. The first circulation branch 60 and the second circulation branch 70 are both connected to one end of the collecting pipe 80, and the other end of the collecting pipe 80 is connected to the second discharge pipeline 50. The second flow detection element 81 is arranged on the collecting pipe 80, and a regulating valve 82 is also provided on the collecting pipe 80. The on-off between the first circulation branch 60 and the collecting pipe 80 is controlled by the second valve member 61, and the on-off between the second circulation branch 70 and the collecting pipe 80 is controlled by the third valve member 71. The circulating flow rate of the first circulation branch 60 or the second circulation branch 70 is adjusted by controlling the opening degree of the regulating valve 82. The delivery pump 33 can be a variable-frequency pump, and the pumping flow rate of the feed is adjusted by controlling the operating frequency of the variable-frequency pump. By providing the collecting pipe 80, it is convenient to adjust the flow rates of the first circulation branch 60 and the second circulation branch 70, reduce the number of settings of the second flow detection element 81 and the regulating valve 82, and simplify the system structure. In order to control the on-off between the collecting pipe 80 and the second discharge pipeline 50, an eighth valve member 83 is provided on the collecting pipe 80.

[0050] It should be noted that the first flow detection element 32, the second flow detection element 81, the delivery pump 33, and the regulating valve 82 can be respectively electrically connected to a controller. The controller controls the delivery pump 33 and the regulating valve 82, improving the automation degree of the system operation and reducing human intervention.

[0051] Refer to Figure 1As shown, in some embodiments, the ultrafiltration system further includes a buffer tank 34 disposed on the feed pipeline 30 between the first circulation branch 60 and the membrane filtration module 20. The buffer tank 34 can buffer the feed in the feed pipeline 30 to avoid feed interruption. Specifically, the buffer tank 34 is disposed at a position between the connection point of the first circulation branch 60 and the feed pipeline 30 and the membrane filtration module 20.

[0052] Refer to Figure 1 As shown, in some embodiments, the ultrafiltration system further includes a second turbidity detector 41 disposed on the first discharge pipeline 40. The second turbidity detector 41 is used to detect the turbidity value of the clarified liquid discharged from the membrane filtration module 20, so as to feedback the state of the clarified liquid after ultrafiltration treatment according to the turbidity value, and facilitate verifying whether the clarified liquid is qualified.

[0053] Refer to Figure 2 As shown, in some embodiments, the membrane filtration module 20 has a first liquid passing port 21, a second liquid passing port 22 and a clarified liquid outlet 23. The first discharge pipeline 40 is connected to the clarified liquid outlet 23; the clarified liquid is discharged to the first discharge pipeline 40 through the clarified liquid outlet 23. The first liquid passing port 21 and the second liquid passing port 22 are located on different sides of the membrane filtration module 20. It should be noted that the structural composition of the membrane filtration module 20 is prior art and will not be described in detail in the present utility model.

[0054] The ultrafiltration system further includes a third circulation branch 24, a fourth circulation branch 25, a fifth circulation branch 26 and a sixth circulation branch 27. The third circulation branch 24 connects the first liquid passing port 21 and the feed pipeline 30, and the fourth circulation branch 25 connects the second liquid passing port 22 and the feed pipeline 30; the fifth circulation branch 26 connects the first liquid passing port 21 and the second discharge pipeline 50, and the sixth circulation branch 27 connects the second liquid passing port 22 and the second discharge pipeline 50; valve members are provided on the third circulation branch 24, the fourth circulation branch 25, the fifth circulation branch 26 and the sixth circulation branch 27.

[0055] The valve on the third circulation branch 24 is designated as the fourth valve 241, the valve on the fourth circulation branch 25 is designated as the fifth valve 251, the valve on the fifth circulation branch 26 is designated as the sixth valve 261, and the valve on the sixth circulation branch 27 is designated as the seventh valve 271. Close the fifth valve 251 and the sixth valve 261, and open the fourth valve 241 and the seventh valve 271. The feed pipeline 30, the third circulation branch 24, the first liquid passing port 21, the filter membrane module 20, the second liquid passing port 22, the sixth circulation branch 27, and the second discharge pipeline 50 form a passage. The feed of the feed pipeline 30 enters the filter membrane module 20 through the third circulation branch 24 and the first liquid passing port 21. The concentrated liquid obtained after being processed by the filter membrane module 20 enters the second discharge pipeline 50 through the second liquid passing port 22 and the sixth circulation branch 27 and is discharged. The filtrate obtained after being processed by the filter membrane module 20 enters the first discharge pipeline 40 through the clear liquid outlet 23 and is discharged. At this time, the first liquid passing port 21 is the liquid inlet, and the second liquid passing port 22 is the liquid outlet. This operating mode of the filter membrane module 20 is called forward operation.

[0056] When the fourth valve 241 and the seventh valve 271 are closed and the fifth valve 251 and the sixth valve 261 are opened, the feed pipeline 30, the fourth circulation branch 25, the second liquid passing port 22, the filter membrane module 20, the first liquid passing port 21, the fifth circulation branch 26, and the second discharge pipeline 50 form a passage. The feed of the feed pipeline 30 enters the filter membrane module 20 through the fourth circulation branch 25 and the second liquid passing port 22. The concentrated liquid obtained after being processed by the filter membrane module 20 enters the second discharge pipeline 50 through the first liquid passing port 21 and the fifth circulation branch 26 and is discharged. The filtrate obtained after being processed by the filter membrane module 20 enters the first discharge pipeline 40 through the clear liquid outlet 23 and is discharged. At this time, the first liquid passing port 21 is the liquid outlet, and the second liquid passing port 22 is the liquid inlet. This operating mode of the filter membrane module 20 is called reverse operation. By adjusting the opening and closing states of the fourth valve 241, the fifth valve 251, the sixth valve 261, and the seventh valve 271, the operating direction of the filter membrane module 20 can be adjusted. It should be noted that the naming of forward operation and reverse operation can also be reversed.

[0057] Refer to Figure 2As shown, in some embodiments, a second pressure detection element 211 is provided at the first liquid passing port 21, and a third pressure detection element 221 is provided at the second liquid passing port 22. The liquid pressure at the first liquid passing port 21 is detected by the second pressure detection element 211, and the liquid pressure at the second liquid passing port 22 is detected by the third pressure detection element 221. When the filter membrane assembly 20 operates in the forward direction, taking the liquid inlet pressure at the first liquid passing port 21 detected by the second pressure detection element 211 as a standard, when the liquid inlet pressure at the first liquid passing port 21 exceeds the second set pressure threshold, the fourth valve member 241 and the seventh valve member 271 are closed, the fifth valve member 251 and the sixth valve member 261 are opened, and the operating direction of the filter membrane assembly 20 is adjusted, so that the filter membrane assembly 20 is adjusted from forward operation to reverse operation, relieving the operating pressure of the filter membrane assembly 20, enabling the filter membrane assembly 20 to operate within the pressure allowable range, and extending its service life. Among them, the second set pressure threshold is set according to the pressure resistance requirement of the filter membrane in the filter membrane assembly 20. Similarly, when the filter membrane assembly 20 operates in the reverse direction, taking the liquid inlet pressure at the second liquid passing port 22 detected by the third pressure detection element 221 as a standard, when the liquid inlet pressure at the second liquid passing port 22 exceeds the second set pressure threshold, the fifth valve member 251 and the sixth valve member 261 are closed, the fourth valve member 241 and the seventh valve member 271 are opened, and the filter membrane assembly 20 is adjusted from reverse operation to forward operation. Both the second pressure detection element 211 and the third pressure detection element 221 can be pressure sensors.

[0058] In some embodiments, the second pressure detection element 211, the third pressure detection element 221, the fourth valve member 241, the fifth valve member 251, the sixth valve member 261, and the seventh valve member 271 are respectively electrically connected to a controller, and each valve member is controlled through the controller, improving the automation degree of the system operation, reducing human intervention, and enhancing production efficiency.

[0059] The working process of the present utility model is as follows:

[0060] Process of directly discharging the concentrated liquid: The second valve member 61 and the third valve member 71 are closed, the first valve member 51 is opened, the stock solution in the stock solution container 10 enters the filter membrane assembly 20 through the feed pipeline 30, after being processed by the filter membrane assembly 20, the clarified liquid enters the clarified liquid collection container 42 through the first discharge pipeline 40; the concentrated liquid enters the concentrated liquid collection container 53 through the second discharge pipeline 50.

[0061] Concentrate repeated ultrafiltration process: The first valve member 51 and the third valve member 71 are closed, and the second valve member 61 is opened. The stock solution in the stock solution container 10 enters the membrane filtration module 20 through the feed pipeline 30. After being processed by the membrane filtration module 20, the filtrate enters the clear liquid collection container 42 through the first discharge pipeline 40; the concentrate enters the first circulation branch 60 through the second discharge pipeline 50, and then flows back to the feed pipeline 30 through the first circulation branch 60, and enters the membrane filtration module 20 again through the feed pipeline 30 for repeated treatment, forming a concentrate repeated ultrafiltration cycle.

[0062] Concentrate with new stock solution repeated ultrafiltration process: The first valve member 51 and the second valve member 61 are closed, and the third valve member 71 is opened. The stock solution in the stock solution container 10 enters the membrane filtration module 20 through the feed pipeline 30. After being processed by the membrane filtration module 20, the filtrate enters the clear liquid collection container 42 through the first discharge pipeline 40; the concentrate enters the second circulation branch 70 through the second discharge pipeline 50, and flows back into the stock solution container 10 through the second circulation branch 70. After the concentrate is mixed with the stock solution in the stock solution container 10, it enters the feed pipeline 30 again, and enters the membrane filtration module 20 through the feed pipeline 30 for repeated treatment, forming a concentrate with new stock solution repeated ultrafiltration cycle, making full use of the concentrate and reducing the output of the concentrate.

[0063] It should be noted that according to the system operating pressure or the utilization requirement of the concentrate, any one of the above three treatment processes can be selected.

[0064] It should be noted that during the direct discharge process of the concentrate, the repeated ultrafiltration process of the concentrate, and the repeated ultrafiltration process of the concentrate with new stock solution, the running direction of the membrane filtration module 20 can be adjusted to ensure that the membrane filtration module 20 operates within the membrane pressure tolerance range.

[0065] In summary, the embodiment of the present utility model provides an ultrafiltration system. The raw liquid is supplied to the filter membrane module 20 through the feed pipeline 30, and the raw liquid is filtered by the filter membrane module 20. The filtrate obtained by the treatment of the filter membrane module 20 is discharged through the first discharge pipeline 40, and the concentrate obtained by the treatment of the filter membrane module 20 can be directly discharged through the second discharge pipeline 50. Since the first circulation branch 60 and the second circulation branch 70 are also connected to the second discharge pipeline 50, the concentrate in the second discharge pipeline 50 can be discharged into the feed pipeline 30 through the first circulation branch 60, and then enter the filter membrane module 20 through the feed pipeline 30, realizing the repeated ultrafiltration process of the single concentrate; the concentrate in the second discharge pipeline 50 can be discharged into the raw liquid container 10 through the second circulation branch 70. After being mixed with the raw liquid in the raw liquid container 10, it enters the filter membrane module 20 through the feed pipeline 30 again, realizing the repeated ultrafiltration process of the concentrate combined with the new raw liquid. Therefore, according to the usage requirements, the present application can select the flow direction of the concentrate discharged from the filter membrane module 20. It can be directly discharged, or the circulation ultrafiltration process of the concentrate in the internal small loop can be carried out, or the circulation ultrafiltration process of the concentrate combined with the raw liquid in the internal large loop can be carried out, improving the flexible processing ability of the system and the operation efficiency of the system. Moreover, by carrying out the repeated ultrafiltration process of the concentrate combined with the new raw liquid, the utilization rate of the concentrate in the ultrafiltration process can be improved, and the output of the concentrate can be reduced.

[0066] Moreover, the filter membrane module 20 has a forward and reverse running function. When the operating pressure of the filter membrane module 20 (specifically, the inlet liquid pressure when the filter membrane module 20 is running) exceeds the preset pressure range, the running direction of the filter membrane module 20 is switched to ensure that the filter membrane operates within the pressure range permitted, and the service life is extended.

[0067] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. An ultrafiltration system, characterized in that, Comprising: A stock solution container (10); A filter membrane assembly (20); A feed pipeline (30) connected between the stock solution container (10) and the filter membrane assembly (20) to supply the stock solution to the filter membrane assembly (20); A first discharge pipeline (40) connected to the filter membrane assembly (20) for discharging the clarified liquid; A second discharge pipeline (50) connected to the filter membrane assembly (20) for discharging the concentrated liquid, and a first valve member (51) is provided on the second discharge pipeline (50); A first circulation branch (60) with one end connected to the feed pipeline (30) and the other end connected to the second discharge pipeline (50) between the first valve member (51) and the filter membrane assembly (20), and a second valve member (61) is provided on the first circulation branch (60); And A second circulation branch (70) with one end connected to the stock solution container (10) and the other end connected to the second discharge pipeline (50) between the first valve member (51) and the filter membrane assembly (20), and a third valve member (71) is provided on the second circulation branch (70); The first circulation branch (60) and the second circulation branch (70) are in parallel.

2. The ultrafiltration system according to claim 1, characterized in that, The ultrafiltration system further includes a first pressure detection element (31) and a controller. The first pressure detection element (31) is provided on the feed pipeline (30), and the first pressure detection element (31), the first valve member (51), the second valve member (61), and the third valve member (71) are respectively electrically connected to the controller.

3. The ultrafiltration system according to claim 2, characterized in that, The ultrafiltration system further includes a first turbidity detector (52) provided on the second discharge pipeline (50) and electrically connected to the controller.

4. The ultrafiltration system according to claim 1, characterized in that The filter membrane assembly (20) has a first liquid passing port (21), a second liquid passing port (22), and a clarified liquid outlet (23), and the first discharge pipeline (40) is connected to the clarified liquid outlet (23); The ultrafiltration system further includes a third circulation branch (24), a fourth circulation branch (25), a fifth circulation branch (26), and a sixth circulation branch (27). The third circulation branch (24) connects the first liquid passing port (21) to the feed pipeline (30), and the fourth circulation branch (25) connects the second liquid passing port (22) to the feed pipeline (30); The fifth circulation branch (26) connects the first liquid passing port (21) to the second discharge pipeline (50), and the sixth circulation branch (27) connects the second liquid passing port (22) to the second discharge pipeline (50); Valve members are provided on the third circulation branch (24), the fourth circulation branch (25), the fifth circulation branch (26), and the sixth circulation branch (27).

5. The ultrafiltration system according to claim 4, characterized in that A second pressure detection element (211) is provided at the first liquid passing port, and a third pressure detection element (221) is provided at the second liquid passing port (22).

6. The ultrafiltration system according to claim 1, wherein The ultrafiltration system further includes a first flow detection element (32), a second flow detection element (81) and a delivery pump (33). The first flow detection element (32) and the delivery pump (33) are respectively arranged on the feed pipeline (30), and the second flow detection element (81) is arranged on the first circulation branch (60) and the second circulation branch (70).

7. The ultrafiltration system according to claim 6, characterized in that, The ultrafiltration system further includes a collecting pipe (80). One ends of the first circulation branch (60) and the second circulation branch (70) are both connected to the collecting pipe (80), and the other end of the collecting pipe (80) is connected to the second discharge pipeline (50). The second flow detection element (81) is arranged on the collecting pipe (80), and a regulating valve (82) is further arranged on the collecting pipe (80).

8. The ultrafiltration system according to claim 1, wherein The ultrafiltration system further includes a second turbidity detector (41), which is arranged on the first discharge pipeline (40).

9. The ultrafiltration system according to claim 1, characterized in that, The ultrafiltration system further includes a buffer tank (34), which is arranged on the feed pipeline (30) between the first circulation branch (60) and the membrane module (20).

10. The ultrafiltration system according to claim 1, wherein The ultrafiltration system further includes a clear liquid collection container (42) and a concentrated liquid collection container (53). The clear liquid collection container (42) is connected to the first discharge pipeline (40), and the concentrated liquid collection container (53) is connected to the second discharge pipeline (50).

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