Filter membrane, filter membrane assembly and filter membrane manufacturing method

Abstract

The present disclosure relates to the field of water treatment technology, and in particular to a filter membrane, a filter membrane assembly and a filter membrane manufacturing method. The filter membrane has a self-healing function, and comprises: a membrane body, the membrane body has a water collection channel, a filter element structure is arranged in the water collection channel, the filter element structure is water permeable, and the water collection channel has a flow state and a damping state; the flow state is configured to allow water to flow through the filter element structure and flow out of the water collection channel; the damping state is configured to allow dirt to gradually accumulate on the filter element structure to slow down or prevent water from flowing out of the water collection channel. The filter membrane assembly comprises a head and the filter membrane; the head is installed on the filter membrane; the head is configured to collect water flowing out of the water collection channel. The filter membrane manufacturing method is used to manufacture the filter membrane, and comprises: making a filter element structure; making a membrane body, and forming a water collection channel on the membrane body, and installing a filter element structure in the water collection channel. The present disclosure is conducive to ensuring the water quality of produced water.

Description

Technical Field

[0001] The present disclosure relates to the technical field of water treatment, and in particular to a filter membrane, a filter membrane assembly and a filter membrane manufacturing method. Background Art

[0002] Filtration membranes, such as ceramic membranes, have the advantages of large flux, acid and alkali resistance, and good durability. They have broad market space and will gradually become the mainstream membrane separation technology in the market. The current ceramic membranes include plate ceramic membranes, tubular ceramic membranes, and hollow fiber ceramic membranes. However, the inventors have found that some ceramic membranes are prone to cracks during transportation. Once the damaged ceramic membranes are put into use, the water quality of the produced water will be affected. For example: the plate ceramic membrane includes a membrane with a through water collection channel. During transportation or use, due to external forces, the surface of some membranes is broken. If the cracks are small, the sludge under the MBR process will gradually block the pores. If the cracks exceed 0.5mm, they cannot be repaired. Sewage with high sludge concentration will enter the water collection channel of the produced water along the cracks, causing the water quality to exceed the standard. Summary of the invention

[0003] The present disclosure provides a filter membrane, a filter membrane assembly and a filter membrane manufacturing method to solve the technical problem recognized by the inventor that the filter membrane is prone to cracks during transportation, and once the damaged filter membrane is put into use, it will affect the water quality of the produced water.

[0004] The present disclosure provides a filtration membrane, which includes: a membrane body, the membrane body having a water collection channel, a filter element structure being arranged in the water collection channel, the filter element structure being water permeable, and the filter element structure being arranged at least at the end of the water collection channel; the water collection channel having a flow state and a damping state; the flow state is configured to enable water to flow through the filter element structure and flow out of the water collection channel; the damping state is configured to enable dirt to be retained on the filter element structure and to enable the dirt to gradually gather on the filter element structure to slow down or prevent water from flowing out of the water collection channel.

[0005] In any of the above technical solutions, further, the filter element structure is a strip structure, the strip structure is arranged in the water collection channel, and the length of the strip structure extends along the length direction of the water collection channel.

[0006] In any of the above technical solutions, further, the strip structure is made of foam ceramic.

[0007] In any of the above technical solutions, further, the strip structure has micropores, and the pore diameter of the micropores is not greater than 1 mm.

[0008] In any of the above technical solutions, further, the material of the strip structure is filter fiber.

[0009] In any of the above technical solutions, further, the filter element structure includes a plurality of granular structures, and the granular structures are columnar or spherical.

[0010] In any of the above technical solutions, further, the filter element structure also includes a surface layer, and the plurality of granular structures are wrapped in the surface layer.

[0011] In any of the above technical solutions, further, the filter membrane is a plate membrane.

[0012] In any of the above technical solutions, further, the plate-type membrane is a plate-type ceramic membrane.

[0013] In any of the above technical solutions, further, the length of the filter element structure is greater than 1 / 2 of the length of the water collection channel.

[0014] The present disclosure also provides a filtration membrane assembly, which includes a seal head and the filtration membrane; the seal head is installed on the filtration membrane; the seal head is configured to collect water flowing out of the water collection channel.

[0015] The present disclosure also provides a method for manufacturing a filter membrane, the method for manufacturing a filter membrane is used to manufacture the filter membrane, and comprises:

[0016] Making filter element structure;

[0017] A membrane body is manufactured, and a water collection channel is formed on the membrane body, and the filter element structure is installed in the water collection channel.

[0018] Optionally, the membrane body is manufactured by an extrusion molding process so that the filter element structure is located in the water collection channel of the membrane body.

[0019] The beneficial effects of the present disclosure are mainly:

[0020] The filter membrane provided by the present disclosure has a self-healing function, and includes: a membrane body, the membrane body has a water collection channel, a filter element structure is arranged in the water collection channel, the filter element structure has water permeability, and at least the end of the water collection channel is provided with the filter element structure; the water collection channel has a flow state and a damping state; the flow state is configured to allow water to flow through the filter element structure and flow out of the water collection channel; the damping state is configured to allow dirt to be retained on the filter element structure and gradually accumulate on the filter element structure to slow down or prevent water from flowing out of the water collection channel. By setting the water collection channel, sewage enters the water collection channel after being filtered through the surface of the membrane body. When the filter membrane is not damaged and cracked, the water in the water collection channel can flow through the filter element structure and flow out from the opening at the end of the water collection channel; when the filter membrane is damaged and cracked, if the crack is small, the sludge under the MBR process will gradually block the crack. If the crack exceeds 0.5mm, it cannot be repaired. The sewage with high sludge concentration will enter the water collection channel for water production along the crack. Since the filter element structure can retain the dirt on the filter element structure, when the dirt on the filter element structure accumulates more and more, the filter element structure in the collection channel is equivalent to a plug, blocking the water collection channel, and water can basically not flow out from the opening at the end of the water collection channel. The filter membrane can achieve self-repair, so that the water quality of the outlet water can be guaranteed.

[0021] The present disclosure also provides a filtration membrane assembly, which includes a sealing head and the filtration membrane; the sealing head is installed on the filtration membrane; the sealing head is configured to collect water flowing out of the water collection channel. Based on the above analysis, it can be seen that the filtration membrane assembly is conducive to ensuring the water quality of the produced water.

[0022] The present disclosure also provides a method for manufacturing a filter membrane, which is used to manufacture the filter membrane, and includes: manufacturing a filter element structure; manufacturing a membrane body, and forming a water collection channel on the membrane body, and installing the filter element structure in the water collection channel. Based on the above analysis, it can be seen that the filter membrane manufacturing method is conducive to ensuring the water quality of the produced water.

[0023] It should be understood that both the foregoing general description and the following specific embodiments are for the purpose of example and illustration and do not necessarily limit the present disclosure. The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate the subject matter of the present disclosure. At the same time, the specification and the drawings are used to explain the principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the structure of the membrane body in one or more embodiments;

[0026] Figure 2 A schematic diagram of the structure of a filter membrane in one or more embodiments;

[0027] Figure 3 for Figure 2 A structural diagram from another perspective;

[0028] Figure 4 for Figure 2 A cross-sectional view of

[0029] Figure 5 is a cross-sectional view of another structure of a filter membrane in one or more embodiments;

[0030] Figure 6 A cross-sectional view of another structure of a filtration membrane in one or more embodiments;

[0031] Figure 7 FIG. 4 is a cross-sectional view of another structure of a filtration membrane in one or more embodiments.

[0032] icon:

[0033] 101- membrane body; 102- water collection channel; 103- filter element structure. DETAILED DESCRIPTION

[0034] The technical solution of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0035] Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present disclosure.

[0036] In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure 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 of the present disclosure. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0038] See also Figures 1 to 7 As shown, in one or more embodiments, a filter membrane is provided, which includes: a membrane body 101, the membrane body 101 has a water collecting channel 102, a filter element structure 103 is arranged in the water collecting channel 102, the filter element structure 103 is water permeable, and at least the end of the water collecting channel 102 is provided with the filter element structure 103; the water collecting channel 102 has a flow state and a damping state; the flow state is configured to enable water to flow through the filter element structure 103 and flow out of the water collecting channel 102; the damping state is configured to enable dirt to be retained on the filter element structure 103, and the dirt is gradually gathered on the filter element structure 103 to slow down or prevent water from flowing out of the water collecting channel 102.

[0039] In some embodiments, the number of the water collection channels 102 on the membrane body 101 is one or more. Further, when the number of the water collection channels 102 is multiple, the multiple water collection channels 102 are arranged side by side along the first direction, and the first direction is arranged at an angle with the length direction of the water collection channels 102, and the angle can be a right angle; each water collection channel 102 is provided with a filter core structure 103. The filter core structure 103 has micropores or gaps for water to pass through. Figure 5 As shown, the filter element structure 103 is disposed at at least one end of the water collection channel 102, or, see Figure 4 As shown, the filter core structure 103 fills the entire water collection channel 102. It should be noted that in some other embodiments, the length of the filter core structure 103 may be greater than 1 / 2 of the length of the water collection channel 102.

[0040] In at least one embodiment, the filter membrane is provided with a water collection channel 102, so that the sewage enters the water collection channel 102 after being filtered through the surface of the membrane body 101. When the membrane body 101 is in an undamaged state, the water collection channel 102 is in a flowing state. Generally, the water quality in the water collection channel 102 is good, and there is basically no dirt, so the water can flow normally in the water collection channel 102 and flow out from the opening of the port of the water collection channel 102. When the filter membrane is damaged and cracks appear, if the cracks are small, the sludge under the MBR process will gradually block the cracks. When the membrane body 101 is damaged and the crack is larger than the first set value, for example, when the first set value is 0.5 mm, sewage with high sludge concentration will enter the water collection channel 102 for water production along the crack. Since the filter element structure 103 retains the dirt on the filter element structure 103, when the dirt on the filter element structure 103 accumulates more and more, the water collection channel 102 gradually changes from a flow state to a damping state, and the filter element structure 103 is equivalent to a hole plug in the collection channel, so that the water collection channel 102 is blocked, and water basically cannot flow out from the opening at the end of the water collection channel 102 or very little water flows out of the blocked water collection channel 102. In this way, the filter element structure 103 is equivalent to a self-repairing structure, or it can be said to be equivalent to a self-healing structure, so that the water collection channel 102 with cracks blocks itself, realizes the self-repair of the filter membrane, which is beneficial to ensure the water quality of the water produced by the filter membrane. Since it is difficult to find the rupture of the filter membrane in normal production, it can only be judged from the water quality of the outlet water. It is difficult to find the cause and find the real damaged membrane, and it is even necessary to empty the membrane pool and check them one by one. By setting an independent self-healing structure in each water collection channel 102, the partial rupture will not affect the normal water production of the water collection channels 102 in other parts of the membrane body 101, and the efficiency of the normal operation of the filter membrane is greatly improved, and the probability of suspension caused by changing the membrane is further reduced. It should be noted that according to the actual production situation, the first set value is not limited to 0.5mm, but can also be other values.

[0041] In some embodiments, the filter element structure 103 is a strip structure, which is arranged in the water collection channel 102, and the length of the strip structure extends along the length direction of the water collection channel 102. This facilitates improving the self-repairing ability of the filter membrane, and when the filter membrane is damaged, the sludge can be gathered on the filter element structure 103 as soon as possible. It should be noted that in some embodiments, the inner wall of the water collection channel 102 has a set roughness to increase the friction between the filter element structure 103 and the water collection channel 102.

[0042] In one embodiment, the shape of the radial cross section of the strip structure is adapted to the shape of the radial cross section of the water collection channel 102. The area of ​​the radial cross section of the strip structure is less than or equal to the area of ​​the radial cross section of the water collection channel 102. When the area of ​​the radial cross section of the strip structure is less than the area of ​​the radial cross section of the water collection channel 102, the gap between the strip structure and the water collection channel 102 is less than or equal to the second set value, and the second set value is not greater than 1 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm or 0.7 mm, which is conducive to the retention of sludge in the gap.

[0043] In some embodiments, the filter element structure 103 is a hard structure whose shape is not easily changed, so as to prevent the water flow from compressing the filter element structure 103 and affecting the flow state of the water collection channel 102 under normal circumstances.

[0044] See also Figures 2 to 4 As shown, in one embodiment, the material of the strip structure is foam ceramic. By using foam ceramic, that is, porous honeycomb mesh ceramic, it can have hardness on the one hand and corrosion resistance on the other.

[0045] In some embodiments, the strip structure has through micropores to allow water to pass through the filter element structure 103, and the pore size of the micropores on the foam ceramic is not greater than 1 mm, for example, the pore size of the micropores is 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm or 0.7 mm. It should be noted that the pore size of the micropores can also be determined according to actual needs.

[0046] In some other embodiments, the material of the strip structure may be in other forms, for example: Figure 7 As shown, the material of the strip structure is filter fiber; the strip structure is a filter fiber bundle. The filter fiber bundle is arranged in the water collection channel 102. In one embodiment, the end of the filter fiber bundle extends out of the opening at the end of the water collection channel 102, and the end of the filter fiber bundle is fixedly arranged between the end of the water collection channel 102, so as to avoid the water flow compressing the filter element structure 103 and affecting the flow state of the water collection channel 102 under normal circumstances.

[0047] In some other embodiments, the filter element structure 103 may be in other forms, for example: Figure 6As shown, the filter element structure 103 includes a plurality of granular structures, and the granular structures are columnar or spherical. The material of the granular structure is the same as that of the membrane body 101. In this way, the self-repair function of the filter membrane can also be achieved through the granular structure. In one embodiment, when the filter element structure 103 does not fill the entire water collection channel 102, the filter element structure 103 also includes a surface layer, and a plurality of granular structures are wrapped in the surface layer, and the surface layer is water permeable. In this way, through the setting of the surface layer, the filter element structure 103 can be located at the end of the water collection channel 102. The surface layer can be made of a corrosion-resistant material, such as glass fiber cloth.

[0048] It should be noted that the filter element structure 103 in the water collection channel 102 can also be a strip structure or a granular structure. The filter element structure 103 of foam ceramic material and the filter element structure 103 of filter fiber material can also be used in combination in the water collection channel 102.

[0049] In some embodiments, the filter membrane is a plate membrane. In one embodiment, the plate membrane is a plate ceramic membrane. It should be noted that in some other embodiments, the filter membrane can also be a tubular membrane or a hollow fiber membrane.

[0050] In one or more embodiments, a filtration membrane assembly is provided, which includes a sealing head and a filtration membrane in at least one embodiment; the sealing head is installed on the filtration membrane; the sealing head is configured to collect water flowing out of the water collection channel 102. The material of the sealing head is hard ABS material.

[0051] In one or more embodiments, a filter membrane manufacturing method is also provided, which is applicable to manufacturing the filter membrane in at least one embodiment, and the filter membrane manufacturing method includes: manufacturing a filter element structure 103; manufacturing a membrane body 101, and forming a water collection channel 102 on the membrane body 101, and installing the filter element structure 103 in the water collection channel 102. It should be noted that in some different embodiments, the manufacturing sequence of the filter element structure 103 and the manufacturing sequence of the membrane body 101 can be synchronized, or one after the other.

[0052] In some embodiments, the method for manufacturing a filter membrane includes: first making a filter element structure 103, and then making a membrane body 101 through an extrusion molding process, so that the filter element structure 103 is located in the water collection channel 102 of the membrane body 101. In one embodiment, a filter membrane having a filter element structure 103 can be made using the existing sandwich extrusion molding process. The filter element structure 103 in the filter membrane made by this method can be a strip structure made of foam ceramic.

[0053] In some other embodiments, the filter membrane manufacturing method includes: after using existing technology to make the membrane body 101 of the filter membrane and the strip structure made of foam ceramic, the filter element structure 103 can be inserted into the water collection channel 102 of the membrane body 101 manually or by machine.

[0054] In some other embodiments, the filter membrane manufacturing method includes: after using existing technology to make the membrane body 101 and the granular filter element structure 103 of the filter membrane, the filter element structure 103 can be filled into the water collection channel 102 of the membrane body 101 manually or by machine.

[0055] In some other embodiments, the method for manufacturing the filter membrane includes: after using existing technology to make the membrane body 101 and the filter fiber bundle of the filter membrane, first fix the two ends of the filter fiber bundle respectively, and then rotate the two ends of the filter fiber bundle in opposite directions to twist the filter fiber bundle so that the diameter of the filter fiber bundle is reduced to a third set value, and then use a steel needle connected to one end of the filter fiber bundle to pass through the water collection channel 102 through the steel needle to achieve the filter fiber bundle passing through the water collection channel 102, and finally fix the two ends of the filter fiber bundle to the membrane body 101.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A filter membrane, characterized in that: include: A membrane body, wherein the membrane body has a water collection channel, the number of the water collection channels on the membrane body is multiple, a filter element structure is arranged in the water collection channel, the filter element structure is water permeable, and the filter element structure is arranged at least at the end of the water collection channel; the water collection channel has a flow state and a damping state; The flow state is configured to allow water to flow through the filter element structure and flow out of the water collection channel; the damping state is configured to allow dirt to remain on the filter element structure and gradually accumulate on the filter element structure to slow down or prevent water from flowing out of the water collection channel, so that the water collection channel with cracks is blocked by itself, thereby achieving self-repair of the filter membrane; The filter element structure is a strip structure, the strip structure is arranged in the water collection channel, and the length of the strip structure extends along the length direction of the water collection channel, and the material of the strip structure is foam ceramic or filter fiber; or, the filter element structure includes a plurality of granular structures, and the granular structures are columnar or spherical; The filter membrane is a plate membrane, a tubular membrane or a hollow fiber membrane.

2. The filtration membrane according to claim 1, characterized in that The strip structure has micropores, and the pore diameter of the micropores is no more than 1 mm.

3. A filtration membrane assembly, characterized in that: It comprises a sealing head and the filter membrane as claimed in claim 1 or 2; the sealing head is installed on the filter membrane; the sealing head is configured to collect water flowing out of the water collection channel.

4. A method for manufacturing a filtration membrane, the method for manufacturing a filtration membrane being used to manufacture the filtration membrane according to claim 1 or 2, characterized in that: include: Making filter element structure; A membrane body is manufactured, and a water collection channel is formed on the membrane body, and the filter element structure is installed in the water collection channel.

5. The method for manufacturing a filtration membrane according to claim 4, characterized in that: The membrane body is manufactured by an extrusion molding process so that the filter element structure is located in the water collection channel of the membrane body.

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