Scale inhibition RO (Reverse Osmosis) membrane assembly
By setting up the scale-resisting material silicon phosphate crystal in the RO membrane assembly, the short service life and scale problems of threaded roll RO membrane when dealing with high hardness water are solved, achieving a longer film life and stable water production.
Patent Information
- Application Number
- CN202421177574.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-27
AI Technical Summary
When treating high hardness water, threaded roll RO film has problems such as short service life, attenuation of water production, increased salt transmittance and blocked membrane fouling, which leads to technical shortcomings when treating high hardness water.
Design a scale-retardant RO membrane module. By setting the scale-retardant material silicon phosphate crystal between the two layers of the water inlet mesh and fixing it between the water inlet mesh, the oval shape and size of the scale-retardant material are larger than the mesh holes. , in combination with the separator to prevent offset and improve the film's anti-fouling performance.
It effectively blocks scale adhesion, extends the service life of the film, maintains the stability of water production and desalination rate, reduces the occurrence of membrane scale, and extends the running time of the film.
Smart Images
Figure CN222342508U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of reverse osmosis membranes, in particular to a RO membrane component. Background Art
[0002] Reverse osmosis is a water treatment technology that uses membrane separation. With the advancement of scientific research and manufacturing technology, reverse osmosis water treatment technology has developed rapidly, from the initial cellulose acetate asymmetric membrane to the cross-linked aromatic polyamide composite membrane made by surface polymerization technology. The operating pressure has experienced a trend of diversification from high-pressure cellulose acetate membrane to low-pressure composite membrane and even ultra-low-pressure composite membrane, nanofiltration membrane, and membrane assembly. Due to its structural advantages, the most widely used spiral wound membrane in industry. The spiral wound membrane is used as a household RO membrane because of its simple structure, relatively high packing density, and good material exchange effect due to the feed partition plate. It is also the main household membrane structure on the market. However, this type of spiral wound RO membrane also has certain problems. Due to the defects such as the long flow path of the osmotic fluid and the difficulty in cleaning the membrane elements, the service life of the membrane will be very short when treating high-hardness water. The water output will decay rapidly with the increase of use time, and the salt permeability will be significantly improved. Ultimately, the membrane surface is blocked by scaling, which makes the RO membrane technically problematic in treating hardness water in the north.
[0003] During the use of reverse osmosis, after water molecules pass through, the salt content in the membrane interface increases, forming a higher concentrated water layer. This layer forms a large concentration gradient with the concentration of the feed water flow. This phenomenon is called concentration polarization of the membrane. The concentration polarization of the membrane makes the substances that are easy to scale increase the tendency to precipitate due to the increase in the concentration of the interface layer, thus causing the membrane to be contaminated by scale; on the other hand, due to the high concentration in the interface layer, calcium and magnesium ions precipitate on the membrane surface, which will increase the osmotic pressure accordingly. When the osmotic pressure increases, the water production under the original operating conditions will inevitably decrease. The fouling on the membrane surface will increase the pressure resistance of the pump in front of the membrane, thereby increasing the temperature of the pump body, accelerating the aging of the pump operation, the attenuation of the flow rate and the reduction of the service life. Although citric acid can be used for cleaning, it is very difficult for the spiral membrane assembly to clean the crystalline deposits from the membrane assembly. Therefore, preventive measures must be taken before the membrane scales.
[0004] Membrane scaling is caused by the slightly soluble salts in the water exceeding the solubility product when the feed water is converted into concentrated water and precipitating on the membrane. The pollutants that scale on the membrane surface include calcium carbonate, calcium sulfate, barium sulfate, silicon dioxide, etc. Among them, calcium carbonate scale is the main reason for the blockage of RO membrane elements by northern water. The main reason for calcium carbonate scaling is that when the calcium ions in the feed water pass through the membrane element, the concentration of calcium ions and carbonate ions in the concentrated water increases, which accelerates the reaction to generate insoluble calcium carbonate. When the calcium carbonate in the concentrated water exceeds the solubility in the water, it precipitates from the water to form white scale that adheres to the surface of the RO membrane, thereby blocking the RO membrane element. Utility Model Content
[0005] In view of the above-mentioned defects, the utility model provides a scale-inhibiting RO membrane assembly, which comprises two scale-inhibiting RO membranes or one scale-inhibiting RO membrane folded in half, two layers of water inlet grids arranged between the two layers of membranes, and scale-inhibiting material arranged between the two layers of water inlet grids, and the scale-inhibiting material is fixed between the two layers of water inlet grids and then rolled up.
[0006] Furthermore, the anti-scaling material is silicon phosphorus crystal.
[0007] Furthermore, the antiscaling material is oval in shape.
[0008] Furthermore, the antiscaling material has a size larger than a hole diameter of the water inlet grid.
[0009] Furthermore, separation sheets are arranged at intervals on the inner sides of the two layers of water inlet grids.
[0010] According to the comparative test results, the scale-inhibiting RO membrane component of the utility model can effectively prevent scale in water from adhering to the membrane surface.
[0011] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the installation of the water inlet grid and the scale-inhibiting material in a preferred embodiment of the utility model;
[0013] Figure 2 It is a cross-sectional view of an RO membrane assembly installed with a water inlet grid and anti-scaling material in a preferred embodiment of the utility model. DETAILED DESCRIPTION
[0014] The following describes several preferred embodiments of the utility model with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The utility model can be embodied in many different forms of embodiments, and the protection scope of the utility model is not limited to the embodiments mentioned in the text.
[0015] like Figure 1-2 As shown, the utility model arranges two anti-scaling RO membranes 1 or folds one anti-scaling RO membrane 1 in half, sets two layers of water inlet grids 2 between the two layers of membranes, and sets anti-scaling materials 3 such as silicon phosphorus crystals between the two layers of water inlet grids 2, and fixes the anti-scaling materials 3 between the two layers of water inlet grids 2, so as to effectively prevent the material from damaging the membrane and control the loss of the anti-scaling materials during the operation of the membrane element. Furthermore, the shape of the anti-scaling material is set to be elliptical, and the size is larger than the hole diameter of the water inlet grid to prevent the sharp corners from easily scratching the membrane or clogging the water inlet grid. Furthermore, the inner side surfaces of the two layers of water inlet grids 3 are respectively provided with spacers 4 to further fix the anti-scaling materials 3 to prevent the anti-scaling materials 3 from being offset during rolling. This increases the width of the flow channel and improves the anti-fouling performance of the membrane element, and then rolls it. The reverse osmosis membrane is a polyamide reverse osmosis membrane. The anti-scaling materials are silicon phosphorus crystal, FOF new anti-scaling material, polyepoxysuccinic acid, sodium polyacrylate, polyaspartic acid, hydrolyzed maleic anhydride, etc.
[0016] Test data:
[0017] Conventional RO membrane test record table 1
[0018] It can be seen that after producing 1800 liters of pure water, the membrane desalination rate and flow rate have obviously declined seriously.
[0019]
[0020] According to the antiscalant RO membrane of the utility model: Table 2
[0021] It can be seen that after the RO membrane containing the antiscaling material according to the utility model produces 4000 liters of pure water, there is no obvious attenuation of the water production flow rate and the desalination rate.
[0022]
[0023] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.
Claims
1. A scale-inhibiting RO membrane assembly, characterized in that: It is made by placing two anti-scaling RO membranes or folding one anti-scaling RO membrane in half, setting two layers of water inlet grids between the two membranes, setting anti-scaling materials between the two layers of water inlet grids, fixing the anti-scaling materials between the two layers of water inlet grids, and then rolling them up.
2. The scale-inhibiting RO membrane assembly according to claim 1, wherein: The anti-scaling materials are silicon phosphorus crystal, FOF new anti-scaling material, polyepoxysuccinic acid, sodium polyacrylate, polyaspartic acid, and hydrolyzed maleic anhydride.
3. The scale-inhibiting RO membrane assembly according to claim 2, wherein: The membrane is a polyamide reverse osmosis membrane.
4. The scale-inhibiting RO membrane assembly according to claim 3, wherein: The antiscaling material is oval in shape.
5. The scale-inhibiting RO membrane assembly according to claim 4, wherein: The antiscaling material size is larger than the hole diameter of the water inlet grid.
6. The scale-inhibiting RO membrane assembly according to claim 5, wherein: Separation sheets are arranged at intervals on the inner sides of the two layers of water inlet grids.