Domestic Reverse Osmosis Membrane
Proshare Innovation Suzhou focuses on the realization of the third generation of Nano-composite thin film type high-end reverse osmosis and nanofiltration membrane TFN R & D and production, in the past 10 years has achieved rapid development, alternative to imported membrane products, stable application in textile wastewater, garbage leachate, high salt and high COD wastewater, and related environmental protection fields. PSI products can be widely used in industrial wastewater treatment, desalination, and pure water production, such as electric power, steel, electronics, electroplating, landfill leachate, petrochemicals, coal chemicals, thermal power, textile printing and dyeing, pulp and paper, pharmaceuticals, municipal drinking water treatment, biochemical technology, foods & beverages, aerospace and so on.
Why Choose Us
Our Factory
Proshare Innovation Suzhou focuses on the realization of the third generation of Nano-composite thin film type high-end reverse osmosis and nanofiltration membrane TFN R & D and production, in the past 10 years has achieved rapid development, alternative to imported membrane products, stable application in textile wastewater, garbage leachate, high salt and high COD wastewater, and related environmental protection fields.
Widely used
PSI products can be widely used in industrial wastewater treatment, desalination, and pure water production, such as electric power, steel, electronics, electroplating, landfill leachate, petrochemicals, coal chemicals, thermal power, textile printing and dyeing, pulp and paper, pharmaceuticals, municipal drinking water treatment, biochemical technology, foods & beverages, aerospace and so on.
Our Product
Reverse Osmosis Membrane Element, NF Membrane elements, Nanofiltration Membrane Element, Loose Nanofiltration Membrane Element, Compact Ultrafiltration Membrane Element, Special Membrane Element for Industry, Brackish Water Osmosis Membrane Element, Desalination RO Membrane Element, Ultra-Low Pressure Osmosis Membrane Element, Water Treatment Equipment and System, Anti-Fouling RO Membrane Elements.
Our Certificate
ROHS COMPLIANCE certificate, IS09001 quality system certificate, Environmental
management system certificate, health safety management system Certificate, Utility model patent certificate, Invention patent of multi-layer RO membrane, Invention patent of membranes produce.
Seawater Desalination Membrane Element
Pro-SW Feature: The unique anti-fouling membrane technology gives excellent anti-fouling ability and washable performance, ensuring high salt-cutting performance while reducing energy consumption and prolonging the cleaning cycle.
Brackish Water Membrane Element
Pro-BW Feature: The unique anti-fouling membrane technology gives excellent anti-fouling ability and washable performance, ensuring high salt-cutting performance while reducing energy consumption and prolonging the cleaning cycle.
Ultra-Low Pressure Membrane Element
Pro-LP Features: PSl MEMBRANE® Pro-LP ultra-low pressure reverse osmosis membrane element is based on the latest Thin Film Nanocomposite (TFN)Technology, which achieves high flux at ultra-low operating pressure and leads to cost down.
Extreme Anti-Fouling Membrane Element
Pro-XFR Features: PSI MEMBRANE® Pro-XFR anti-fouling membrane is a third-generation Nano-composite membrane type(TFN)reverse osmosis membrane element the unique anti-fouling membrane technology gives excellent anti-fouling ability and clean ability, ensures high salt interception performance while reducing energy consumption and prolonging cleaning cycle.
Pro-FR Feature: The unique anti-fouling membrane technology gives excellent anti-fouling ability and washable performance, ensuring high salt-cutting performance while reducing energy consumption and prolonging the cleaning cycle.
Our reverse osmosis membranes remove up to 99% of more than 1,000 impurities in water, including asbestos, calcium, salt, fluoride, lead (up to 98% removal), chlorine, and arsenic, giving you peace of mind.
What is Domestic Reverse Osmosis Membrane
Domestic reverse osmosis membrane consists of a spiral-wound sheet of semipermeable material, which varies dependent on application. Membranes are available in 2-inch, 4-inch and 8-inch diameter with the 4-inch and 8-inch diameter sizes most commonly used in the water treatment industry.The water treatment industry, as a whole, has accepted a 40-inch length as a standard size so that membranes from different manufacturers are interchangeable in equipment systems. One of the primary measurements of a domestic reverse osmosis membrane is its square footage. Domestic reverse osmosis membrane are available in the range of 350-450 square feet of surface area.Domestic reverse osmosis membrane were first constructed using cellulose acetate (CA).
The desalination rate of reverse osmosis is high. The desalination rate of a single membrane can reach 99%. The desalination rate of a single-stage reverse osmosis system can generally be stable above 90%, and the desalination rate of a two-stage reverse osmosis system can generally be stable above 98%.
Because reverse osmosis can effectively remove microorganisms such as bacteria, organic matter, and inorganic substances such as metal elements, the quality of effluent water is better than other methods.
The domestic reverse osmosis membrane slows down the change of the produced water quality caused by the fluctuation of the source water quality, which is conducive to the stability of the water quality in the production, which has a positive effect on the stability of the quality of the pure water product.
It can greatly reduce the burden of subsequent processing equipment, thereby prolonging the service life of subsequent processing equipment.
What Are the Similarities Between Domestic Reverse Osmosis Membrane and Nanofiltration Membrane
Reverse osmosis (RO) and nanofiltration (Nano) are two very similar technologies. Visually, they are almost identical and both use essentially the same technology to remove impurities from water or other liquids. In both systems, membrane elements (or membranes or elements) are used to separate the liquid from the contaminants. Membranes are basically filters with very small "openings" that prevent contaminants from passing through as the liquid being purified is "pushed" through the membrane.
Both RO and NF Benefit from Pretreatment
Because all filtration membranes have the smallest pores, RO and NF membranes can quickly scale if larger particles are not removed by upstream filtration technologies such as media filtration or MF/UF. Pretreating the process stream to remove these problematic particles also reduces the amount of energy required to maintain adequate pressure in the RO/NF system.
When the process stream is adequately pretreated, RO and NF membranes have a long service life and require relatively little maintenance. This is because the influent water continuously flows over the surface of the filtration membrane in what is called cross-flow filtration, which results in rejected material being flushed away with the effluent stream rather than clumping onto the membrane.
Both RO and NF Require Pressure to Work
While RO and NF are quite effective purification technologies, both require energy to move water through their membranes. This is because their fine pores result in high concentrations of salts and other compounds on the retention side of the membrane, so sufficient pressure must be applied to enable the water to overcome the osmotic pressure that causes the water to resist flow through the membrane.
Both Are Used to Replace Traditional Treatment Technologies
The traditional water treatment series (in the case of industrial applications) usually consists of several unit processes including: coagulation, flocculation, sedimentation, clarification, ion exchange and filtration. For residential treatment, these steps are sedimentation, clarification, ion exchange, filtration, purification and polishing.
Preparations
Before loading, make sure safety shoes, rubber gloves, safety glasses, pliers, silicone lubricant, clean rags, and glycerin are well-prepared.
Check the upstream feed pipe and remove dust, grease and metal debris from the pipeline. If further cleaning is required, chemical cleaning is adopted to clean the feed pipe and the pressure vessel to ensure all foreign matters are effectively removed.
Check the feed water quality. Before loading the membrane element, use pre-treated water to flow through the pressure vessel for 30 minutes. Meanwhile, check if the quality of water entering into the membrane meets the feed water requirements of the membrane elements. Check if there is any leakage in the pipeline.
Remove the end plate and thrust cone from the pressure vessel. You may refer to the product schematic diagram when removing.
Use fresh water to flush the opened pressure vessel, and remove dust and deposits. If further cleaning is required, prepare a mop whose head is equal to the inner diameter of the pressure vessels. Let the mop absorb 50% glycerin solution and drag it back and forth inside the pressure vessel until the inner wall of the pressure vessel is clean and moistened to facilitate the membrane element loading.
Before loading the membrane elements, make sure all parts and chemical agents for loading, dosing and pipeline systems are well prepared. In addition, make sure the pre-filter system runs smoothly.
Open the membrane package just before loading the element, otherwise, it shall be sealed in the original package for storage.
》Take out the membrane elements carefully from the packing box. Check if the position and direction of the brine sealing ring on the membrane element are correct. It should be noted that the open section of the brine sealing ring shall be placed towards the feed water direction.
》Place the end of membrane element without the brine seal ring horizontally into the feed water end of the pressure vessel and push the element until about 10 cm of the element length is exposed outside the feed water end of the pressure vessel. It should be noted that always load membrane elements into the feed water end of the pressure vessel.
》Install the interconnector into the permeate tube of the element. Before installing the interconnector, lubricate the o-ring seals on the interconnector with silicon lubricate, glycerin or qualified pre-treated water to facilitate the interconnector installation.
》Take out the 2nd membrane elements carefully from the packing box. Check if the position and direction of the brine sealing ring on the 2nd element are correct. Hold the 2nd element carefully and make the interconnector on the 1st element insert into the the permeate tube of the 2nd element. Slide the 2nd element until about 10 cm of the element length is exposed outside the the feed water end of the pressure vessel. Push the 2nd element into the pressure vessel and hold it carefully so that the weight is not supported by the interconnector.
》All elements are loaded into the pressure vessel. And then turn to the concentrate end and install the thrust cone into the concentrate end of the 1st element.
》Check the o-ring on the adaptor connected with the membrane element carefully. Insert the end of the adaptor without the o-ring into the end plate (sealing board, sealboard rubber o-ring, pressure head) and secure with fastening nuts. Insert the end of the adaptor with the o-ring into the permeate tube of the element. Place the stopper around the pressure head, install the retaining ring on the stopper and secure the stopper with stop screws.
》Install the end plate on the feed water end the same way as install the concentrate end (without the thrust cone installation procedure). And then install the inlet plug.
》Load membrane elements into every pressure vessel and connect all external feed water, concentrate and permeate pipes.
Materials Used in Domestic Reverse Osmosis Membrane
Cellulose acetate membrane (CA membrane sheet)
Cellulose acetate is a loose white particle or fibrous powder, odorless, non-toxic, light stable, and highly hygroscopic. It is currently a widely studied reverse osmosis membrane material. Although cellulose acetate is a good membrane material, the - COOR in its molecular chain makes it easy to hydrolyze under high temperature and acid-base conditions, and alkaline or acidic hydrolysis can cause the acetyl group to disappear. Therefore, the use of pure CA materials is subject to certain limitations.
Aromatic polyamide film (PA membrane sheet)
Aromatic polyamides are widely used in the membrane industry due to their physical and chemical stability, resistance to strong alkalis, oil esters, and organic solvents, and good mechanical strength. However, due to the charged nature of PA membranes operating at pH 6-10, particles in water are prone to deposit on the surface of the membrane, reducing its service life.
Chitosan membrane (CS membrane sheet)
Chitosan (CS) is obtained by removing acetyl groups from chitosan molecules. It has a wide range of sources, good film-forming properties and biocompatibility, and is easy to chemically modify. Due to its molecular structure, pure water used in reverse osmosis can form strong hydrogen bonds with water molecules, and its ability to remove alkaline earth metal ions is strong. Therefore, it is superior to CA membranes and polyamide membranes and is considered a highly promising membrane material, which has received widespread attention internationally. Cs reverse osmosis membrane has high flux and selectivity, and has a good removal effect on divalent metal salts. Due to its strong alkali resistance and acid resistance after crosslinking, Cs membranes are not easily able to reproduce microorganisms and are often used as reverse osmosis membranes for softening hard water.
Polyphenylene reverse osmosis membrane
Polyphenylene materials such as polybenzimidazole (PBD) and polyphenylene oxide (PPO) have also attracted widespread attention due to their high temperature resistance, acid and alkali resistance, and can be modified to obtain better thin film materials.
Other composite reverse osmosis membranes
Composite reverse osmosis membrane is a type of membrane that combines a thin, dense layer of different materials with special separation functions on a porous support substrate. It has a higher solute separation rate and water penetration rate than integrated membranes, and therefore has a market share of over 90%. Currently, composite reverse osmosis membranes have been widely used in fields such as petrochemicals, electronics, textiles, light industry, metallurgy, medicine, biotechnology, food, and environmental protection.
How to Flash or Clean a Domestic Reverse Osmosis Membrane
After using an domestic reverse osmosis membrane for a while, it is highly possible that impurities may clog inside the domestic reverse osmosis membrane housing and on the domestic reverse osmosis membrane. So, it is high recommended to clean the housing and the membrane often when using a domestic reverse osmosis membrane. It is a good habit to always make sure the membrane and housing is kept clean all the times, since the frequency at which the domestic reverse osmosis membrane is cleaned is strongly related to the quality of the water.
When dealing with hard water, various salts, minerals, and undesired foreign substances might accumulate and obstruct the smooth passage of water, resulting in a lower flow rate of the membrane. This may result in a decrease in the rejection rate as well as a decrease in the water quality on your system. So, cleaning your membrane is a very basic step in maintaining your system and ensuring that you get the best quality water at all times.
There are two types of cleaning agents: One for cleaning calcium and magnesium ions, which is used in areas with high water quality, and another for cleaning organic compounds. It may be created from scratch at home or purchased ready-made. To carry out this cleaning process, make sure that you have a PH tester. The reason for this is that while cleaning the membrane, we use citric acid or hydrochloric acid; citric acid is produced into a 2% solution, therefore the PH value must be kept around 2 – 3.If cleaning organic matter, use 0.1% sodium hydroxide plus 0.025% sodium dodecyl sulfonate, mix with purified water and adjust the PH value to about 11-12.
Only one solvent can be used at a time, not both solvents. Mixed-use will not only have no effect but also cause irreversible damage to the domestic reverse osmosis membrane. If you wish to use both solvents, first wash the membrane with calcium and magnesium ion cleaning solution for about two hours; then rinse with clean water, followed by organic cleaning solution. Of course, if the blockage is too serious, then simply use the booster pump to pump the reagent into the domestic reverse osmosis membrane shell, soak it for two hours, and then clean it. After cleaning, rinse the membrane with clean water.
Although cleaning a domestic reverse osmosis membrane is a good practice, it is not suggested to clean a membrane on a regular basis if its performance is poor. We propose replacing the membrane since cleaning a membrane can be difficult if you are unfamiliar with the chemicals or solutions used in the procedure.
FAQ
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