Lining water treatment membrane

Abstract

The utility model discloses a lining water treatment membrane. The lining water treatment membrane comprises a lining substrate and a water treatment separation membrane layer, wherein the lining substrate is provided with a porous structure and a plurality of pit structures, and the water treatment separation membrane layer is arranged on the lining substrate; the plurality of pit structures at least partially face the water treatment separation membrane layer; the lining water treatment membrane has a self-repairing function, after the membrane material is damaged and broken in the using process, a bacterial colony blocking area can be rapidly formed on the lining substrate, the repairing function is achieved, chemical improvers do not need to be additionally added to modify the membrane layer on the surface, and the lining water treatment membrane is simple, easy to operate and high in economical efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of water treatment, concretely relates to a kind of lining water treatment membrane. BACKGROUND

[0002] Membrane preparation and separation technology have been relatively mature, and are widely used in various industries for water treatment, including municipal, printing and dyeing, chemical, electronic, petrochemical, pharmaceutical, new energy, river management and the like. Membrane products may be contaminated and worn out in actual application, thereby affecting water quality and service life, and increasing the cost of water treatment. Currently, research is being conducted to prepare polymer separation membrane materials with self-repairing function to achieve durable service life of water treatment membranes. In actual use, when the water treatment membrane is damaged, the material can repair itself, thereby realizing the overall performance of the water treatment membrane without affecting the overall performance. For example, Chinese patent CN104174297A dissolves one or more block copolymers into a casting solution to form a self-repairing surface with spherical or rod-shaped micellar structure; and Chinese patent CN106943892A adds an isocyanate-terminated repair agent to the casting solution, which crosslinks when it comes into contact with water, and the repair material rapidly combines with the membrane material. However, these repair methods require the addition of polymers during the preparation of the casting solution, which has relatively high requirements for membrane preparation and production, and also has high cost. SUMMARY

[0003] The utility model aims at overcoming one or more shortcomings in the prior art, and provides an improved lining water treatment membrane that can self-repair after membrane surface damage. The lining water treatment membrane does not require additional chemical modifiers to modify the surface membrane layer, is simple to operate, and is cost-effective.

[0004] Generally, in the field of water treatment, it is generally recognized that the membrane layer on the separation membrane surface needs to be smooth, forming a relatively flat plane structure, to avoid the problem of other substances such as sludge or bacterial colonies adhering and accumulating on the surface during water treatment, causing clogging of the separation membrane pores.

[0005] The inventors of the present application have found that the water treatment membrane cannot be self-repaired when damaged or the water treatment membrane with self-repairing performance is not easy to prepare based on the existing water treatment membrane, and through a large number of experimental researches, the inventors have innovatively realized self-repairing of the water treatment membrane by using the bacteria and sludge existing in the water body, and specifically, the present application sets the pit structure on the inner lining base to increase the specific surface area of the inner lining base, and when the surface water treatment separation membrane layer is damaged, the existence of the pit structure greatly improves the possibility of sludge and bacteria adhesion, and due to the existence of the rough structure, when the sludge and bacteria move to the place in the water body, the sludge and bacteria will be adsorbed or accumulated at the place, and then based on the characteristics that the bacteria can grow, a large number of bacteria aggregates can be formed at the damaged membrane layer in a short time, and when the bacteria aggregates and the sludge are mixed and accumulated together, a barrier is formed to prevent the water to be treated from directly flowing out through the damaged gap, which is equivalent to repairing the damaged membrane layer, so that self-repairing of the membrane layer is realized, and the repairing process does not need to add special substances in the membrane layer, and the self-repairing can be realized only by relying on the characteristics of the water body, and the damaged place is very small and tiny, the repairing method basically does not cause the separation efficiency of the water treatment membrane to decrease, the service life of the water treatment membrane is increased, and the economic effect is better.

[0006] To achieve the above-mentioned purpose, the present application adopts a technical scheme:

[0007] An inner lining water treatment membrane comprises an inner lining base with a porous structure and a plurality of pit structures and a water treatment separation membrane layer arranged on the inner lining base.

[0008] The plurality of pit structures have at least part of the pit structures facing the water treatment separation membrane layer.

[0009] In some embodiments of the present application, the water treatment separation membrane layer has part of the area located in one or more of the pit structures.

[0010] In some embodiments of the present application, the inner lining base comprises first fiber filaments and second fiber filaments with the pit structures, the first fiber filaments are arranged in the interlaced manner with the second fiber filaments and form a barrier area, and the remaining first fiber filaments form an inner lining structure; wherein the water treatment separation membrane layer has part of the area located in the barrier area, and the part of the area is in contact with the first fiber filaments and the second fiber filaments respectively.

[0011] Further, the diameter of the first fiber filaments is greater than the diameter of the second fiber filaments.

[0012] According to the present application, the inner lining structure is not in contact with the water treatment separation membrane layer.

[0013] In some embodiments of the present application, the diameter of the first fiber filament is 0.5-4mm.

[0014] In some embodiments of the present application, the denier of the second fiber filament is 300D-1200D.

[0015] In some embodiments of the present application, the specific surface area of the second fiber filament is 2000-5000 square meters per cubic meter.

[0016] In some embodiments of the present application, the material of the first fiber filament is polyamide, polypropylene, polycarbonate or polybutylene succinate.

[0017] In some embodiments of the present application, the material of the second fiber filament is polyester, polyvinyl alcohol or polyacrylonitrile.

[0018] In some embodiments of the present application, the inner lining base is a knitted tube or a woven cloth.

[0019] In some embodiments of the present application, the inner lining base is formed by weaving the first fiber filament and the second fiber filament by a weaving method, and the weaving method is a conventional means, which is not described in detail here.

[0020] In some embodiments of the present application, in the inner lining base, the number ratio of the first fiber filament to the second fiber filament is 1:2-3.

[0021] In some embodiments of the present application, the barrier region has two and is located on the upper and lower surfaces of the inner lining structure, respectively, and the water treatment separation membrane layer has two and corresponds to the barrier region one by one.

[0022] In some embodiments of the present application, the thickness of the inner lining base is 0.5-2mm. When corresponding to a tubular shape, it can be 0.5-2mm in diameter.

[0023] In some embodiments of the present application, the thickness of the water treatment separation membrane layer is 0.06-0.15mm.

[0024] Another technical solution provided by the present application is the application of the above-mentioned inner lining water treatment membrane in water treatment.

[0025] In some embodiments of the present application, in the process of water treatment, the inner lining water treatment membrane is arranged in the water body to be treated with aerobic bacteria or anaerobic bacteria, and optionally with sludge.

[0026] Due to the use of the above technical solution, the present application has the following advantages compared with the prior art:

[0027] 1. The lining water treatment membrane has a self-repairing effect, and after damage and rupture of the membrane material during use, a colony blocking area can be quickly formed on the intermediate lining base, achieving the effect of repair.

[0028] 2. The water treatment membrane of the utility model in the conventional membrane liquid formula, add lining fiber silk, can be made into hollow fiber membrane, flat sheet membrane, roll type membrane and so on. At the same time, the combination strength of the membrane material can be strengthened, the bearing strength is also high, and the economic benefit is obvious in the simple aspect of manufacturing cost. The service life of the water treatment membrane can be effectively increased. Especially, the high-strength lining base is conducive to the stable adhesion of the colony and the formation of a stable blocking area. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0030] Figure 1 It is a structure schematic view of the lining water treatment membrane of the utility model embodiment 1.

[0031] Figure 2 It is a structure schematic view of the second fiber silk in the utility model embodiment.

[0032] Figure 3 It is a structure schematic view of the lining water treatment membrane of the utility model embodiment 2.

[0033] Figure 4 It is a structure schematic view of the lining water treatment membrane of the utility model embodiment 2.

[0034] In the drawing mark: 100, lining water treatment membrane;111, first fiber silk;112, lining structure;113, second fiber silk;1131, pit;114, blocking area;115, hollow structure;120, water treatment separation membrane layer;200, water inlet tank;300, water inlet pump;400, water inlet valve;500, backflow pipe;600, treatment chamber. DETAILED DESCRIPTION

[0035] The utility model provides a novel lining water treatment membrane which is repaired by relying on the bacteria colony and sludge existing in the water body to be treated. Generally, in the field of water treatment, for the membrane material, it is generally recognized that the membrane layer on the surface of the separation membrane needs to be smooth, forming a relatively flat plane structure, so as to avoid the problem of clogging the holes of the separation membrane caused by the attachment and accumulation of other substances such as sludge or bacteria colony on the surface during the water treatment process. Based on a large number of experimental researches, the inventors of the utility model increase the specific surface area of the lining substrate by providing a pit structure on the lining substrate, so as to realize that when the surface water treatment separation membrane layer is damaged, the existence of the pit structure greatly improves the possibility of sludge and bacteria colony attachment. Due to the existence of such rough structure, when the sludge and bacteria colony move to this place in the water body, they will be adsorbed or accumulated at this place. Then, based on the growing characteristics of the bacteria colony, a large number of bacteria colony aggregates can be formed at the damaged place of the membrane layer in a short time. When the bacteria colony aggregates and the sludge are mixed and accumulated together, a barrier is formed, which can prevent the water to be treated from directly flowing out through the damaged gap, which is equivalent to "patching" the damaged place of the membrane layer, so as to realize the self-repair of the membrane layer. Moreover, the repair process does not need to add special substances in the membrane layer, and the self-repair can be realized only by relying on the characteristics of the water body itself. Moreover, the damaged place is very small, so the repair method basically will not cause the decrease of the separation efficiency of the water treatment membrane, greatly increasing the service life of the water treatment membrane and achieving better economic effect.

[0036] Further, the lining water treatment membrane of the utility model comprises a lining substrate with a porous structure and a plurality of pit structures and a water treatment separation membrane layer arranged on the lining substrate; at least part of the plurality of pit structures is directed to the water treatment separation membrane layer;

[0037] Alternatively, the lining water treatment membrane of the utility model comprises a lining substrate with a porous structure and a water treatment separation membrane layer arranged on the lining substrate; the lining substrate comprises a support layer and a combination layer, the support layer comprises a lining structure composed of first fiber filaments, and the combination layer comprises a barrier region formed by the interlaced arrangement of the first fiber filaments and second fiber filaments, and the first fiber filaments in the barrier region are at least part of the first fiber filaments in the lining structure;

[0038] The diameter of the first fiber filaments is greater than the diameter of the second fiber filaments, and a plurality of pits are formed on the second fiber filaments; the water treatment separation membrane layer has a partial region located in the barrier region, and the partial region is in contact with the first fiber filaments and the second fiber filaments in the barrier region, respectively.

[0039] In some embodiments, the bonding layer has two layers, which are respectively located on the upper and lower surfaces of the support layer; the water treatment separation membrane layer has two layers, which correspond one-to-one with the bonding layer; and the inner liner structure does not contact the water treatment separation membrane layer.

[0040] Furthermore, this utility model also provides a method for preparing an inner lining water treatment membrane, the method comprising:

[0041] (1) The first fiber filament and the second fiber filament are spun into a porous inner lining substrate by textile technology; wherein the second fiber filament is a fiber filament with multiple pits formed by one or more physical and / or chemical methods;

[0042] (2) The water treatment separation membrane casting solution is applied to the inner liner substrate and left in the air to form an intermediate;

[0043] (3) The intermediate is placed in a coagulation bath to form an inner water treatment membrane.

[0044] In some embodiments, the material of the first fiber may include one or more components selected from PA polyamide, PP polypropylene, PC polycarbonate, PBS polybutylene succinate, etc., and the diameter of the first fiber is 0.5-4mm; the material of the second fiber may include one or more components selected from PET polyester, PVA polyvinyl alcohol, PAN polyacrylonitrile, etc., and the fineness of the second fiber is 300D-1200D; the first fiber is thicker than the second fiber, which can effectively support internal and external pressure, achieve pressure bearing and shape retention, and is conducive to forming a network structure with larger gaps, which is beneficial to water treatment separation;

[0045] Textile processes can be conventional textile methods such as knitting or weaving, which will not be elaborated on here. For example, the first and second fiber filaments can be knitted into hollow fiber tubes, i.e., knitted tubes, using mechanical equipment; or they can be woven into woven fabrics using weaving processes. When used as an inner lining base, a single knitted tube or multiple knitted tubes can be used as the inner lining base, or a single woven fabric or multiple woven fabrics can be used as the inner lining base. Furthermore, generally, in the inner lining base, the ratio of the number of the first fiber filaments to the number of the second fiber filaments is 1:2-3.

[0046] In some embodiments, the one or more steps of physical and / or chemical methods include acid etching and alkali etching. The acid etching can be carried out by immersion etching using hydrochloric acid, the mass concentration of which can be 5%-10%, and the immersion time can be 30 min-3 h. The alkali etching can be carried out by immersion etching using sodium hydroxide aqueous solution and / or potassium hydroxide aqueous solution, the mass concentration of which can be 5%-10%, and the immersion time can be 30 min-3 h. Further, the acid etching and alkali etching can be respectively carried out at 70-80°C, and after the etching is completed, the second fiber yarn can be rinsed with clean water, dried and used. After the treatment is completed, the specific surface area of the second fiber yarn can reach 2000-5000 square meters per cubic meter.

[0047] In some embodiments, the casting solution for the water treatment separation membrane is a conventional casting solution, which contains, for example, by mass percentage, 10-20% of a high molecular polymer, 50-70% of an organic solvent, and 20-30% of an additive. The high molecular polymer can be selected from PVDF (polyvinylidene fluoride), PES (polyether sulfone), PS (polysulfone), PP (polypropylene), PVC (polyvinyl chloride), PTFE (polytetrafluoroethylene), etc. The organic solvent can be selected from DMAC (dimethylacetamide), DMSO (dimethyl sulfoxide), DMF (dimethylformamide), acetone, etc. The additive can be selected from PEG (polyethylene glycol), glycerol (glycerin), pyrrolidone, pyridine, etc. The way of applying the casting solution on the inner liner substrate includes spraying, blade coating, casting, spinneret spinning, etc. The casting solution not only forms a film layer on the surface of the inner liner substrate, but also penetrates into the inner liner substrate, i.e. into the barrier region, to form a combined region where the film layer and the inner liner substrate are combined, i.e. the casting solution penetrates into the gap between the fiber yarns and is firmly combined with the fiber yarns, greatly improving the stability of the film layer on the inner liner substrate and preventing it from falling off. Then, the casting solution is left in the air for a period of time, for example, 0.1-10 min, and the organic solvent volatilizes to form an initial intermediate.

[0048] In some embodiments, the coagulation bath is a conventional coagulation bath, which can be composed of one or more of water, N-methyl pyrrolidone, methanol, ethanol, dimethylformamide, and dimethylacetamide. The immersion time in the coagulation bath can be 2-1000 s, during which phase separation is achieved to generate fine membrane pores, thereby forming a porous water treatment membrane with a retention effect for effectively filtering sewage, i.e. into the inner liner water treatment membrane. Generally, the thickness of the inner liner substrate is 0.5-2 mm, and the thickness of the water treatment separation membrane layer is 0.06-0.15 mm.

[0049] The existence of the lining base can not only improve the setting stability of the water treatment separation membrane layer, but also has a good supporting effect, can effectively guarantee that the whole lining water treatment membrane has certain supporting effect and deformation capacity under external force, and is conducive to long-term stable use.

[0050] In the actual preparation process, at least the following three forms of lining water treatment membranes can be prepared:

[0051] Form one: the casting solution is extruded by using a spinneret, the spinneret is penetrated by a lining base such as a knitted tube, the knitted tube is a hollow fiber tube, the casting solution extruded around the knitted tube penetrates into the knitted tube, and after staying in the air for a period of time, the casting solution enters a coagulation bath for phase separation to form a hollow fiber membrane with a cylindrical surface porous membrane layer (water treatment separation membrane layer), an intermediate bonding layer and an internal supporting layer, that is, a lining water treatment membrane.

[0052] Form two: the casting solution is cast on both sides of the woven cloth, the average uniform thickness is scraped by using a scraper, the casting solution penetrates into the woven cloth, and then enters a coagulation bath for phase separation to form a flat plate membrane with two porous membrane layers (water treatment separation membrane layers), an intermediate bonding layer and an internal supporting layer, that is, a lining water treatment membrane.

[0053] Form three: the casting solution is cast on one side of the woven cloth, the average uniform thickness is scraped by using a scraper, the casting solution penetrates into the woven cloth, and then enters a coagulation bath for phase separation to form a flat plate membrane with a porous membrane layer (water treatment separation membrane layer), a bonding layer and a supporting layer arranged in sequence, and then the flat plate membrane is rolled into a cylindrical roll type membrane.

[0054] In order to make the above-mentioned purposes, characteristics and advantages of the utility model more obvious and easy to understand, the utility model will be described in detail below by combining with the drawings and specific embodiments. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, therefore, the utility model is not limited by the following disclosed specific embodiments.

[0055] In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0056] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0058] Example 1

[0059] This example provides a water treatment membrane with an inner lining and its preparation method. See also: Figures 1 to 2 As shown, the inner liner water treatment membrane 100 includes an inner liner substrate with a porous structure and a water treatment separation membrane layer 120 disposed on the inner liner substrate; the inner liner substrate includes a support layer and a bonding layer, the support layer includes an inner liner structure 112 composed of first fiber filaments 111, and the bonding layer includes a barrier region 114 formed by the interlacing of first fiber filaments 111 and second fiber filaments 113, wherein at least part of the first fiber filaments in the barrier region 114 are the first fiber filaments in the inner liner structure 112;

[0060] The diameter of the first fiber filament 111 is larger than the diameter of the second fiber filament 113. Multiple pits 1131 are formed on the second fiber filament 113, and these multiple pits are randomly distributed on the surface of the fiber filament. The water treatment separation membrane layer 120 has a portion located within the barrier region 114, and a portion of the region is in contact with the first fiber filament and the second fiber filament in the barrier region 114, respectively.

[0061] The first fiber filament 111 is PP polypropylene fiber with a diameter of 0.5 mm; the second fiber filament 113 is PET polyester fiber with a fineness of 600D; in the inner lining substrate, the ratio of the first fiber filament to the second fiber filament is 1:2.

[0062] The inner lining substrate is a woven fabric structure. There are two bonding layers, which are located on the upper and lower surfaces of the support layer respectively. There are two water treatment separation membrane layers, which correspond one-to-one with the bonding layers. The inner lining structure does not contact the water treatment separation membrane layers.

[0063] The preparation method of the water treatment membrane lining includes:

[0064] (1) Select commercially available PET polyester fiber and soak it in 8% hydrochloric acid for 1.5 hours, controlling the soaking temperature to be around 75°C.

[0065] Then immerse in 8% sodium hydroxide aqueous solution for 1.5 hours, control the temperature at about 75℃;

[0066] After the soaking, clean with water, and dry for use as the second fiber yarn.

[0067] The knitted fabric with a thickness of 1mm, which is woven by the first fiber yarn and the second fiber yarn, is used as the inner lining substrate.

[0068] (2) The intermediate is formed by using the above-mentioned form two, casting the membrane solution (containing 15% PVDF, 60% DMAC and 25% PEG by mass percentage) on both sides of the knitted fabric, scraping the average uniform thickness (about 0.1mm) with a doctor blade, and staying in the air for 100s.

[0069] (3) Then immerse the intermediate into the coagulation bath of deionized water for 300s to form the inner lining water treatment membrane.

[0070] Example 2

[0071] This example provides an inner lining water treatment membrane and a preparation method thereof, which are basically the same as example 1, and the difference is that the inner lining substrate is a knitted tube structure with a diameter of 1.95mm, and the inner lining water treatment membrane is prepared by using the above-mentioned form one.

[0072] Referring to Figure 3 The inner lining water treatment membrane 100 in the form of hollow fiber membrane has a porous membrane layer (water treatment separation membrane layer 120) on the cylindrical surface, a barrier zone 114 in the middle, an inner lining structure 112 inside, and a hollow structure 115 in the middle.

[0073] Comparative Example 1

[0074] This example provides an inner lining water treatment membrane and a preparation method thereof, which are basically the same as example 2, and the difference is that the commercially available PET polyester material PET fiber is directly used as the second fiber yarn without acid and alkali etching treatment.

[0075] Application Experiment

[0076] The inner lining water treatment membranes in the form of hollow fiber membrane obtained from example 2 and comparative example 1 are subjected to water treatment experiment, and the water production and water quality of the two are compared by using the water quality of the aerobic tank of biochemical wastewater (the sludge concentration containing bacterial colonies is about 8000±200mg / L) to test.

[0077] The inner lining water treatment membranes in the form of hollow fiber membrane obtained from example 2 and comparative example 1 are subjected to water treatment experiment, and the water production and water quality of the two are compared by using the water quality of the aerobic tank of biochemical wastewater (the sludge concentration containing bacterial colonies is about 8000±200mg / L) to test. Figure 4The experimental device shown in the experiment includes a water inlet tank 200, a water inlet pump 300, a water inlet valve 400, a backflow pipe 500 and a treatment chamber 600, the water inlet tank 200, the water inlet pump 300, the water inlet valve 400 and the treatment chamber 600 are communicated in sequence, the two ends of the backflow pipe 500 are communicated with the treatment chamber 600 and the water inlet tank 200 respectively, and the lining water treatment membrane 100 is placed in the treatment chamber 600. The water inlet pump is used to pump the water in the water inlet tank into the inside of the filter shell filled with the lining water treatment membrane, and the water is discharged from the lower end of the inner hole of the lining water treatment membrane in the form of a hollow fiber membrane after being filtered by the lining water treatment membrane.

[0078] At the same time, the lining water treatment membrane skin is cut into a 1x1mm opening, and the results show that the water production of the lining water treatment membrane in the form of a hollow fiber membrane of Comparative Example 1 is increased by 10%, the turbidity is also increased by 1 times, and then it is always in a high turbidity state, while the lining water treatment membrane of Example 2 of the present application can be repaired within about 3h, so that the water production and turbidity can be basically restored to the initial state.

[0079] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

[0080] The endpoints of the ranges and any values disclosed in this document are not limited to the precise values recited as the exact dimensions are not critical to the present application. The endpoints of the ranges and any values should be understood to be approximate such that slight variations are to be expected. For ranges, the endpoints are provided as a separate point for use in the claims. For values, the endpoints are provided as a separate point for use in the claims. The exact value of the endpoints will depend on the particular application and requirements. It is intended that every maximum, minimum and intermediate value of the ranges for each element parameters be specifically recited.

Claims

1. An internally lined water treatment membrane, characterized by, The inner lining water treatment membrane comprises an inner lining substrate with a porous structure and a plurality of pit structures, and a water treatment separation membrane layer arranged on the inner lining substrate. The plurality of pit structures have at least part of the pit structures facing the water treatment separation membrane layer.

2. The lined water treatment membrane of claim 1, wherein, The water treatment separation membrane layer has part of the area located in one or more of the pit structures.

3. The lined water treatment membrane of claim 1, wherein, The inner lining substrate comprises first fiber filaments and second fiber filaments with the pit structures, the first fiber filaments have part of the first fiber filaments interlaced with the second fiber filaments and form a barrier region, and the remaining first fiber filaments form an inner lining structure; wherein the water treatment separation membrane layer has part of the area located in the barrier region, and the part of the area is in contact with the first fiber filaments and the second fiber filaments, respectively.

4. The lined water treatment membrane of claim 3, wherein, The diameter of the first fiber filaments is greater than the diameter of the second fiber filaments; and / or the inner lining structure is not in contact with the water treatment separation membrane layer.

5. The lined water treatment membrane of claim 3, wherein, The diameter of the first fiber filaments is 0.5-4mm; and / or the fineness of the second fiber filaments is 300D-1200D.

6. The lined water treatment membrane of claim 3, wherein, The specific surface area of the second fiber filaments is 2000-5000 square meters per cubic meter.

7. The lined water treatment membrane of claim 3, wherein, The material of the first fiber filaments is polyamide, polypropylene, polycarbonate or polybutylene succinate; and / or the material of the second fiber filaments is polyester, polyvinyl alcohol or polyacrylonitrile.

8. The lined water treatment membrane according to claim 1 or 3, wherein, The inner lining substrate is a knitted tube or a woven cloth; and / or the inner lining substrate is formed by weaving the first fiber filaments and the second fiber filaments by a weaving method.

9. The lined water treatment membrane of claim 3, wherein, The number ratio of the first fiber filaments to the second fiber filaments in the inner lining substrate is 1:2-3; and / or the barrier region has two and is respectively located on the upper and lower surfaces of the inner lining structure, and the water treatment separation membrane layer has two and corresponds to the barrier region one by one.

10. The lined water treatment membrane of claim 1, wherein, The thickness of the inner lining substrate is 0.5-2mm; and / or the thickness of the water treatment separation membrane layer is 0.06-0.15mm.

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