CN212881885U - Anti-pollution flat membrane - Google Patents
Anti-pollution flat membrane Download PDFInfo
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- CN212881885U CN212881885U CN202020980999.1U CN202020980999U CN212881885U CN 212881885 U CN212881885 U CN 212881885U CN 202020980999 U CN202020980999 U CN 202020980999U CN 212881885 U CN212881885 U CN 212881885U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The utility model provides a pair of antipollution flat membrane carries out physics or chemical treatment to it at the film manufacturing in-process, makes its surface form the depressed part that has the regular morphology of certain shape, size and direction. The structure of the recess comprises any one or more of the following features: a strip-shaped groove structure; a dot-shaped recessed structure; a polygonal-shaped recessed structure; the extending direction of the cross section of the concave part forms an included angle with the water flow direction of the surface of the membrane body. By preparing the flat membrane with the concave parts with regular shapes, the concave parts can enable inlet water to form the micro-vortex effect, can effectively slow down membrane pollution and reduce the cleaning period, thereby prolonging the service life of the membrane, enabling the flat membrane to not only keep the desalination performance unchanged, but also effectively slow down membrane pollution, reducing the cleaning period, prolonging the service life of the membrane, having large adjustable space and obvious anti-pollution effect.
Description
Technical Field
The utility model relates to a membrane technology field especially relates to an antipollution flat sheet membrane.
Background
With the rapid development of membrane technology, a series of flat membranes, such as nanofiltration membranes, reverse osmosis membranes, ultrafiltration membranes and microfiltration membranes, are widely used in the fields of municipal sewage, industrial wastewater and the like. However, in the practical application process, the membrane pollution problem exists, which not only affects the use efficiency of the membrane, but also causes adverse effect on the service life of the membrane due to frequent cleaning, and leads to increase of the application cost. The membrane pollution is mainly divided into organic pollution, inorganic pollution and microbial pollution, and factors influencing the membrane pollution mainly comprise the following three aspects: firstly, the quality of the inlet water, such as the particle size of pollutants, the pH value of the inlet water, the ion composition, the ionic strength and the like; secondly, the operation condition, such as the operation flux, the recovery rate, the membrane surface flow rate and the like of the membrane system, is greatly influenced by the fluid mechanics condition; and thirdly, the characteristics of the membrane, such as pore size distribution, hydrophilicity and hydrophobicity, surface charge, roughness and the like. However, in the practical application process, the quality of the inlet water is not easy to change, and the method for improving the pollution period by changing the operation conditions has a limited effect generally, and can cause the defects of reduction of water yield, increase of energy consumption and the like. Therefore, it is important to improve the contamination resistance of the membrane itself while reducing the running cost by improving the running process.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an antipollution flat membrane for solve the technical problem who exists among the prior art.
In order to achieve the purpose, the utility model adopts the following technical scheme.
An anti-pollution flat membrane comprises a plate-shaped membrane body;
the membrane body is provided with a plurality of concave parts, and the structure of the concave parts comprises any one or more of the following characteristics: a strip-shaped groove structure, a dotted concave structure and a polygonal concave structure; the extending direction of the concave part of the strip-shaped groove structure and the water flow direction on the surface of the membrane body form an included angle theta;
the area of the water flowing to the concave part along the surface of the membrane body is guided by the concave part to form a vortex.
Preferably, the width of the concave part of the strip-shaped groove structure is 0.1 mm-1 mm, and the depth is 0.01 mm-1 mm.
Preferably, the width of the concave part of the strip-shaped groove structure is 0.38mm, and the depth of the concave part of the strip-shaped groove structure is 0.08 mm; the interval between adjacent concave parts is 0.4 mm.
Preferably, the concave part of the dot-shaped concave structure is a hemispherical dot-shaped concave structure, and the diameter of the concave part is 0.01 mm-1 mm.
Preferably, the recessed part of the polygonal recessed structure comprises a rectangular recessed structure and a prismatic recessed structure; the side length of the concave part is 0.1 mm-1 mm, and the depth is 0.01 mm-1 mm.
Preferably, the concave part is of a prismatic concave structure, the side length of the concave part is 0.45mm, and the depth of the concave part is 0.05 mm; the spacing between adjacent depressions is 0.1 mm.
Preferably, the included angle theta between the extending direction of the concave part of the strip-shaped groove structure and the water flow direction of the surface of the film body satisfies 0 degrees < theta < 180 degrees.
Preferably, the material of the anti-fouling flat sheet membrane comprises a polysulfone substrate or a polyolefin.
Preferably, the recesses of the stripe-shaped groove structure and/or the dot-shaped recess structure are arranged in an array.
By the aforesaid the embodiment of the utility model provides a technical scheme can see out, the utility model provides a pair of antipollution dull and stereotyped membrane carries out physics or chemical treatment to it at the film manufacturing in-process, makes its surface form the depressed part that has the regular topography of certain shape, size and direction. The structure of the recess comprises any one or more of the following features: a strip-shaped groove structure; a dot-shaped recessed structure; a polygonal-shaped recessed structure; the extending direction of the cross section of the concave part forms an included angle with the water flow direction of the surface of the membrane body. By preparing the flat membrane with the concave parts with regular shapes, the concave parts can enable inlet water to form the micro-vortex effect, can effectively slow down membrane pollution and reduce the cleaning period, thereby prolonging the service life of the membrane, enabling the flat membrane to not only keep the desalination performance unchanged, but also effectively slow down membrane pollution, reducing the cleaning period, prolonging the service life of the membrane, having large adjustable space and obvious anti-pollution effect.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic perspective view of a recessed portion of an anti-pollution flat membrane according to a strip-shaped groove structure provided by the present invention;
fig. 2 is a schematic perspective view of a concave portion of an anti-pollution flat membrane with a dotted concave structure according to the present invention;
fig. 3 is a schematic perspective view of a concave portion of an anti-pollution flat membrane adopting a polygonal concave structure according to the present invention;
fig. 4 is a cross-sectional view of an anti-pollution flat membrane provided by the present invention;
fig. 5 is a schematic diagram illustrating a relationship between a water flow direction and a recessed portion when the anti-pollution flat membrane provided by the present invention adopts the recessed portion having a strip-shaped groove structure;
FIG. 6 is a graph showing inlet pressure as a function of operating time for a second embodiment of an anti-fouling flat membrane according to the present invention;
fig. 7 is a graph showing inlet pressure as a function of operation time for a third embodiment of an anti-fouling flat membrane according to the present invention.
In the figure:
1. the membrane body 2, a recess;
a. the width b of the concave part of the strip-shaped groove structure, the interval h between adjacent concave parts and the depth of the concave part;
e. the water flow direction on the surface of the membrane body.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" include plural referents unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be given by way of example only with reference to the accompanying drawings, and the embodiments are not limited thereto.
Example one
Referring to fig. 1 to 5, the present invention provides an anti-pollution flat membrane, which comprises a plate-shaped membrane body 1;
the film body 1 is provided with a plurality of concave parts 2 with regular shape structure characteristics, and the structure of the concave parts 2 comprises any one or more of the following characteristics: a strip-shaped groove structure; a dot-shaped recessed structure; a polygonal-shaped recessed structure; as shown in fig. 5, the extending direction of the cross section of the concave part 2 of the strip-shaped groove structure and the water flow direction on the surface of the membrane body 1 form an included angle θ;
the area of the water flowing to the concave part 2 along the surface of the membrane body 1 is guided by the concave part 2 to form a vortex.
The utility model provides an antipollution dull and stereotyped membrane carries out physics or chemical treatment to it at the film manufacturing in-process, makes its surface form the depressed part 2 that has the regular morphology of certain shape, size and direction, and the appearance size of depressed part 2 is adjustable. By preparing the flat membrane with the concave parts 2 with regular shapes, the concave parts 2 can enable inlet water to form a micro-vortex effect, can effectively slow down membrane pollution and reduce a cleaning period, thereby prolonging the service life of the membrane, and the flat membrane not only can keep the desalination performance unchanged, but also can effectively slow down membrane pollution, reduce the cleaning period and prolong the service life of the membrane.
Further, in some preferred embodiments, the width a of the concave part 2 of the strip-shaped groove structure is 0.1mm to 1mm, and the depth h is 0.01mm to 1 mm;
further, preferably, the width a of the concave part 2 of the strip-shaped groove structure is 0.38mm, and the depth h is 0.08 mm; the spacing b between adjacent recesses 2 is 0.4 mm.
In other preferred embodiments, the concave part 2 of the dot-shaped concave structure is a hemispherical dot-shaped concave structure, and the diameter of the concave part 2 is 0.01 mm-1 mm.
The concave part 2 of the polygonal concave structure comprises a rectangular concave structure and a prismatic concave structure; the side length of the concave part 2 is 0.1 mm-1 mm, and the depth h is 0.01 mm-1 mm.
Furthermore, preferably, the concave part 2 is of a prismatic concave structure, the side length of the concave part 2 is 0.45mm, and the depth h is 0.05 mm; the spacing b between adjacent recesses 2 is 0.1 mm.
In the preferred embodiment provided by the present invention, the extension direction of the cross section of the recessed portion 2 and the water flow direction of the surface of the membrane body 1 form an angle θ within the range of 0 ° < θ < 180 °.
In the preferred embodiment of the present invention, as shown in fig. 2 and 3, the concave portions 2 having the dotted concave structure and/or the polygonal concave structure are distributed in an array.
The utility model provides a material of antipollution flat sheet membrane includes traditional polysulfone substrate and polyolefin (polyethylene, polypropylene etc.) substrate, and the range of application of this flat sheet membrane includes but not limited to flat sheet nanofiltration membrane, reverse osmosis membrane, milipore filter and microfiltration membrane.
Example two
In the embodiment, a reverse osmosis membrane RO-1 with a regular groove shape on the surface and a reverse osmosis membrane RO-2 with an irregular surface are adopted to carry out a scale resistance comparison experiment. Both membrane flux and salt rejection properties were identical, 38.7LMH, 96.8% (test conditions: 250ppm NaCl solution, 60 psi). The groove width of the regular morphology on the surface of the RO-1 membrane is 0.38mm, the groove depth h is 0.08mm, and the groove interval b is 0.4 mm.
The anti-scaling test solution adopts 787.67mg/L NaHCO3And 607.725mg/L CaCl2And mixing the solution, wherein the operation condition is cross-flow filtration, the constant flux is 15LMH, the membrane surface flow rate is 0.027m/s, and the regular groove direction of the RO-1 membrane and the water inlet cross-flow direction of the test solution form 90 degrees. The inlet pressure profile is shown in FIG. 6, after 102 hours of operation, the RO-1 inlet pressure rises by 28.6%, while the RO-2 inlet pressure rises by 138.6%, so it can be seen that the anti-scaling performance of the RO-1 membrane is significantly better than that of RO-2.
EXAMPLE III
In the embodiment, a nano-filtration membrane NF-1 with a regular diamond-shaped concave surface and a nano-filtration membrane NF-2 with an irregular surface are adopted to carry out an anti-pollution performance comparison experiment. Both membrane flux and salt rejection properties were identical, 60.5LMH, 98.6% (test conditions: 2000ppm magnesium sulfate solution, 70 psi). The side length of a diamond-shaped concave with a regular shape on the surface of the NF-1 membrane is 0.45mm, the acute angle of the diamond is 60 degrees, the concave depth h is 0.05mm, and the interval b is 0.1 mm.
The anti-pollution test solution adopts a mixed solution of 16mg/L fulvic acid, 416.3mg/L calcium chloride, 0.198mg/L aluminum chloride and 320mg/L sodium sulfate, and the pH value is adjusted to 7.8-8, so that organic and inorganic composite pollution exists in the inlet water. The operation conditions are cross-flow filtration, constant flux is 30LMH, the membrane surface flow rate is 0.054m/s, wherein the cross-flow direction of test solution water inlet and the side length of the regular rhombus of the NF-1 membrane are 90 degrees. The inlet pressure change is shown in FIG. 7, after 102 hours of operation, the NF-1 inlet pressure rises by 13.6 percent, while the NF-2 inlet pressure rises by 36.4 percent, so that the NF-1 membrane has the anti-pollution performance which is obviously better than that of the RO-2.
To sum up, the utility model provides a pair of antipollution flat membrane carries out physics or chemical treatment to it at the film-making in-process, makes its surface form the depressed part that has the regular topography of certain shape, size and direction. The structure of the recess comprises any one or more of the following features: a strip-shaped groove structure; a dot-shaped recessed structure; a polygonal-shaped recessed structure; the extending direction of the cross section of the concave part forms an included angle with the water flow direction of the surface of the membrane body. By preparing the flat membrane with the concave parts with regular shapes, the concave parts can enable inlet water to form the micro-vortex effect, can effectively slow down membrane pollution and reduce the cleaning period, thereby prolonging the service life of the membrane, enabling the flat membrane to not only keep the desalination performance unchanged, but also effectively slow down membrane pollution, reducing the cleaning period, prolonging the service life of the membrane, having large adjustable space and obvious anti-pollution effect.
Those of ordinary skill in the art will understand that: the figures are schematic representations of one embodiment, and the blocks or processes in the figures are not necessarily required to practice the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An anti-pollution flat membrane is characterized by comprising a plate-shaped membrane body;
the membrane body is provided with a plurality of concave parts, and the structure of the concave parts comprises any one or more of the following characteristics: a strip-shaped groove structure, a dotted concave structure and a polygonal concave structure; the extending direction of the concave part of the strip-shaped groove structure and the water flow direction on the surface of the membrane body form an included angle theta;
the area of the water flowing to the depressed part along the surface of the membrane body is guided by the depressed part to form a vortex.
2. The anti-pollution flat membrane according to claim 1, wherein the width of the recessed part of the strip-shaped groove structure is 0.1mm to 1mm, and the depth of the recessed part is 0.01mm to 1 mm.
3. The anti-pollution flat membrane according to claim 2, wherein the width of the recessed part of the strip-shaped groove structure is 0.38mm, and the depth of the recessed part of the strip-shaped groove structure is 0.08 mm; the interval between adjacent concave parts is 0.4 mm.
4. The anti-pollution flat membrane according to claim 1, wherein the concave portions of the dot-shaped concave structures are hemispherical dot-shaped concave structures, and the diameters of the concave portions are 0.01mm to 1 mm.
5. The anti-pollution flat sheet membrane according to claim 1, wherein the recesses of the polygonal-shaped recessed structures comprise rectangular recessed structures and prismatic recessed structures; the side length of the concave part is 0.1 mm-1 mm, and the depth is 0.01 mm-1 mm.
6. The anti-pollution flat sheet membrane according to claim 5, wherein the recesses are of a prismatic recessed structure, and have a side length of 0.45mm and a depth of 0.05 mm; the interval between adjacent concave parts is 0.1 mm.
7. The anti-pollution flat membrane according to claim 1, wherein the extending direction of the recessed part of the strip-shaped groove structure and the water flow direction of the membrane body surface form an included angle theta which is more than 0 degrees and less than 180 degrees.
8. The anti-pollution flat sheet membrane according to any one of claims 1 to 7, wherein the material of the anti-pollution flat sheet membrane comprises polysulfone substrate or polyolefin.
9. The anti-pollution flat sheet membrane according to any one of claims 1 to 7, wherein the recesses of the stripe-shaped groove structures and/or the dot-shaped recess structures are arranged in an array.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020980999.1U CN212881885U (en) | 2020-06-02 | 2020-06-02 | Anti-pollution flat membrane |
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| CN202020980999.1U CN212881885U (en) | 2020-06-02 | 2020-06-02 | Anti-pollution flat membrane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111804147A (en) * | 2020-06-02 | 2020-10-23 | 北京碧水源膜科技有限公司 | Anti-pollution flat membrane |
| CN114984770A (en) * | 2022-06-22 | 2022-09-02 | 江苏诺莱智慧水务装备有限公司 | Anti-pollution hollow fiber membrane and preparation method thereof |
-
2020
- 2020-06-02 CN CN202020980999.1U patent/CN212881885U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111804147A (en) * | 2020-06-02 | 2020-10-23 | 北京碧水源膜科技有限公司 | Anti-pollution flat membrane |
| CN114984770A (en) * | 2022-06-22 | 2022-09-02 | 江苏诺莱智慧水务装备有限公司 | Anti-pollution hollow fiber membrane and preparation method thereof |
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