RO Membrane for Drinking Water System: Safe Purification

RO Membrane for Drinking Water System: Safe Purification

RO membrane for drinking water system is a high-performance reverse osmosis membrane specially developed for drinking water purification scenarios, with core characteristics of high purification precision, food-grade safety, stable operation and low energy consumption. 

 Adopting food-grade high-purity aromatic polyamide composite membrane material, combined with optimized spiral wound structure and low-pressure design, it integrates high-precision purification, safety and energy-saving functions, which can stably operate in various raw water environments such as tap water, groundwater and surface water. Different from ordinary RO membranes, this membrane adopts a three-layer composite structure—polyester non-woven fabric as the supporting layer, polysulfone porous layer as the transition layer, and ultra-thin polyamide layer as the core separation layer—with a pore size of only 0.1 nanometers, realizing molecular-level screening of water molecules and harmful substances. It has two specifications: 8-inch (for commercial and industrial use) and 1812/2012 (for household use), with an effective membrane area of 1.8-37 square meters, which is easy to install and replace, and can be directly matched with most conventional drinking water purification systems without large-scale modification. The membrane element is vacuum-sealed and packaged with food-grade protective solution (containing no more than 0.5% sodium bisulfite), ensuring no harmful substance leaching during transportation and storage, and adapting to various drinking water purification environments such as families, office buildings, schools and rural areas.

2. Application Scenarios

Benefiting from its core advantages of high purification precision, food-grade safety and stable operation, RO membrane for drinking water system has a wide range of applications, focusing on various drinking water purification scenarios. First, household drinking water purification, which is suitable for urban and rural families, can purify tap water and groundwater, remove residual chlorine, heavy metals, bacteria and other harmful substances, and provide safe drinking water for daily drinking, cooking and washing. Second, commercial centralized drinking water supply, which is applicable to office buildings, shopping malls, hotels and other places, can realize centralized purification of drinking water, meet the large-scale drinking water needs of employees and customers, and ensure water quality safety. Third, school and hospital drinking water treatment, which is suitable for primary and secondary schools, universities and hospitals, has strict requirements on water quality, and this membrane can effectively remove harmful substances, providing safe drinking water for students and patients. Fourth, rural drinking water improvement, which is applicable to rural areas with poor raw water quality, can purify groundwater and surface water, solve the problem of unsafe drinking water in rural areas, and improve the quality of life of rural residents. In addition, it can also be used in portable drinking water equipment and emergency drinking water purification projects, providing safe drinking water support in special scenarios.

3. Technical Parameters

The technical parameters of RO membrane for drinking water system are precisely optimized to fully reflect its core characteristics of high purification precision, food-grade safety and low energy consumption, and the core parameters are as follows: the membrane material is food-grade high-purity aromatic polyamide composite membrane, non-toxic and tasteless, no harmful substance leaching, and the service life can reach 2-3 years (household) and 3-5 years (commercial); the nominal desalination rate is ≥99.6%, the bacteria rejection rate is ≥99.99%, the virus rejection rate is ≥99.99%, the organic matter rejection rate is ≥99.0%, and the produced water meets national and international drinking water standards; the recommended operating pressure is 0.4-1.2MPa (low-pressure design, energy-saving), which is suitable for various drinking water purification systems; the operating temperature is 5-45℃, the inlet water pH value is 2-11 (cleaning pH value is 1-12), the inlet water Silt Density Index (SDI) is ≤3, and the inlet water turbidity is ≤0.5NTU; under standard conditions (25℃, 0.6MPa), the water production flux is 18-38m³/(m²·d) (adjustable according to specifications); the single membrane recovery rate is 10-20% (household) and 20-30% (commercial); the physical size includes 8-inch (outer diameter × length: 8.0×40 inches, dry weight 22kg) and 1812/2012 (household standard size); the cleaning cycle is 60-90 days, and the flux recovery rate after cleaning is ≥98%; the membrane can withstand a maximum pressure of 3.0MPa, and the maximum pressure drop is ≤0.10MPa.

4. Product Advantages

The core advantages of RO membrane for drinking water system are concentrated in high purification precision, food-grade safety, stable operation and low energy consumption, which accurately solve the key pain points of drinking water purification. First, ultra-high purification precision: the 0.1-nanometer pore size realizes molecular-level screening, effectively removing salts, heavy metals, bacteria, viruses, organic pollutants and other harmful substances, ensuring that the produced water meets drinking water standards. Second, food-grade safety: the membrane material meets food-grade standards, no harmful substance leaching, and the protective solution is also food-grade, ensuring the safety of drinking water from the source. Third, low energy consumption: the low-pressure design (recommended operating pressure 0.4-1.2MPa) reduces the energy consumption of the purification system, saving energy and reducing use costs. Fourth, stable operation and long service life: the high-quality food-grade membrane material and optimized spiral wound structure ensure stable performance under long-term drinking water purification conditions, and the service life is longer than that of ordinary RO membranes. Fifth, wide adaptability: it can adapt to various raw water environments such as tap water, groundwater and surface water, with small performance attenuation, and is suitable for various drinking water purification scenarios.

5. Application Procedures

Combined with years of practical experience, the application procedures of RO membrane for drinking water system are simple and standardized, which is convenient for users to operate, and special attention should be paid to safety protection and regular maintenance during operation. Pre-installation preparation: Check the integrity of the membrane element, confirm that the surface and sealing ring are not damaged, and check that the food-grade protective solution is intact; clean the system pipeline, remove impurities such as rust and sediment, and prepare installation tools and water quality monitoring instruments (especially conductivity and bacteria monitors). Membrane element installation: Install it into the corresponding pressure vessel according to the specifications (household 1812/2012 or commercial 8-inch), ensure that the connection is tight and the direction is correct, the water inlet and outlet cannot be reversed, and install the sealing ring to prevent water leakage. System commissioning: Turn on the power and water source, adjust the pressure to 0.6MPa, adjust the flow rate to the recommended value, run the system for 30-60 minutes, and check whether the desalination rate, water quality and other parameters are normal. Normal operation: Regularly monitor the pressure, flux, desalination rate and water quality, and keep records. If the pressure increases by 0.1MPa or the flux decreases by 15%, clean it in time. Membrane cleaning: Use food-grade cleaning solution (acidic or alkaline) according to the pollution type, circulate and clean at 25-35℃ for 30-60 minutes, rinse with clean water until neutral, then restart. Daily maintenance: After the system is shut down, rinse the membrane element for 5-10 minutes, regularly check the sealing ring, and properly store it in food-grade protective solution when not in use for a long time; avoid long-term contact with strong oxidants such as residual chlorine to prevent membrane damage, and replace the membrane element regularly according to the service life.

6. Quality Standards

RO membrane for drinking water system strictly follows the dual international and domestic quality standards, focusing on food-grade safety and purification precision to ensure reliable and stable product performance. Internationally, it follows the ISO 9001 quality management system, ASTM D4516-00(2020) test method and WHO drinking water quality standards; domestically, it complies with GB/T 30307-2013 "Reverse Osmosis Membrane Elements for Water Treatment", GB/T 5749-2022 "Sanitary Standards for Drinking Water", GB/T 17219-2025 "Hygienic Safety Evaluation of Drinking Water Transmission and Distribution Equipment, Protective Materials and Water Treatment Materials" and GB/T 30306—2024 "Household and Similar Uses Drinking Water Treatment Filter Elements". Core quality requirements: The membrane material meets food-grade standards, no harmful substances are leached; the nominal desalination rate is ≥99.6%, the bacteria rejection rate is ≥99.99%, the flux recovery rate after cleaning is ≥98%, and each unit is subjected to 60 minutes of stable testing before leaving the factory, including water quality safety detection and structure integrity detection to ensure product reliability; the membrane has no deformation or water leakage under the maximum pressure, and the maximum pressure drop is ≤0.10MPa; the safety performance and purification stability reach the advanced level of the industry, and it can operate stably in various raw water environments for a long time; each batch of products has a unique production batch number and test report, which is fully traceable.

7. Working Principle

RO membrane for drinking water system realizes high-precision purification of drinking water based on the reverse osmosis principle, combined with food-grade membrane material technology, optimized spiral wound structure and low-pressure design. Osmosis is a natural phenomenon in which water molecules spontaneously flow from a low concentration solution to a high concentration solution. Reverse osmosis applies a pressure greater than the osmotic pressure (0.4-1.2MPa) on the high concentration side (raw water side), forcing water molecules to pass through the semi-permeable membrane (with a pore size of 0.1 nanometers) to the low concentration side (produced water side), while retaining salts, heavy metals, bacteria, viruses, organic pollutants and other harmful substances (with a molecular diameter larger than 0.1 nanometers). The three-layer composite structure of the membrane ensures both purification precision and mechanical strength: the polyester non-woven fabric supporting layer enhances the stability of the membrane, the polysulfone porous layer guides water molecules to penetrate quickly, and the ultra-thin polyamide separation layer realizes high-precision screening. The optimized spiral wound structure makes the water flow evenly distributed on the membrane surface, reducing the concentration polarization effect, ensuring stable flux and purification efficiency, and the low-pressure design reduces energy consumption while ensuring purification effect.

8. Future Prospects

With the increasing emphasis on drinking water safety and the continuous improvement of people’s health awareness, RO membrane for drinking water system, with its core advantages of high purification precision, food-grade safety and low energy consumption, has broad development prospects. In the future, this membrane will be intelligently upgraded, integrating Internet of Things and sensor technology to realize real-time monitoring of membrane fouling degree, flux, water quality and other parameters, and automatic reminder of cleaning and replacement, which is in line with the development trend of intelligent drinking water purification. It will also continuously optimize the membrane material and structural design, further improve purification precision and energy-saving performance, reduce the volume of membrane elements, and adapt to more compact drinking water equipment. At the same time, it will expand application scenarios to remote rural areas, emergency rescue, outdoor exploration and other fields, solve the problem of unsafe drinking water in special scenarios, and promote the popularization of safe drinking water. In addition, it will focus on environmental protection, develop recyclable membrane materials, improve the recycling rate of waste membranes, reduce environmental pollution, and comply with the development direction of green and sustainable drinking water purification.

9. Conclusion

As a high-performance membrane specially designed for drinking water purification scenarios, RO membrane for drinking water system takes food-grade high-purity aromatic polyamide composite membrane as the core and optimized spiral wound structure as the support, integrating high-precision purification, food-grade safety and low-energy consumption technology, and fully conforms to international and domestic strict quality standards such as ISO 9001, GB/T 5749-2022 and GB/T 17219-2025. It is specially developed to solve the key pain points of traditional RO membranes in drinking water purification scenarios, such as insufficient purification precision, unstable performance and potential safety hazards. Through its 0.1-nanometer high-precision separation layer and food-grade material design, it achieves ultra-high purification precision and safety, effectively removing various harmful substances in raw water, ensuring that the produced water meets drinking water standards, and providing safe and healthy drinking water for people. Widely applicable to household, commercial, school, hospital and rural drinking water purification scenarios, it not only ensures drinking water safety, but also has the advantages of low energy consumption, stable operation and long service life, becoming a core choice for modern drinking water purification systems. Looking forward, with the continuous optimization of membrane material technology and intelligent upgrading, RO membrane for drinking water system will further improve its performance and adaptability, expand its application scenarios, and play a more important role in the field of drinking water purification, helping to promote the healthy development of the drinking water purification industry and safeguard people’s drinking water safety and health.

10. Frequently Asked Questions (FAQs)

Q1: What is the core function of RO membrane for drinking water system? 

A1: The core function is to realize high-precision purification of drinking water through the reverse osmosis principle, with the core characteristics of high purification precision, food-grade safety and low energy consumption, which can effectively retain salts, heavy metals, bacteria, viruses and organic pollutants in raw water, and provide safe and healthy drinking water that meets national standards.

Q2: What is the service life of this membrane, and how to extend it? 

A2: The service life is 2-3 years for household use and 3-5 years for commercial use under normal maintenance. Regularly clean the membrane element according to the fouling situation, keep the operating parameters stable, avoid long-term contact with strong oxidants, replace the damaged sealing ring in time, and properly store it in food-grade protective solution when not in use for a long time; regular pretreatment of raw water can also effectively extend the service life.

Q3: What is the applicable raw water TDS range of this membrane? 

A3: It is mainly applicable to raw water with a TDS of 50-5000mg/L, such as tap water, groundwater and surface water, and can adapt to slight fluctuations in salt content, which is suitable for most drinking water purification scenarios.

Q4: What should I do if the water production taste is abnormal during operation? 

A4: First, check whether the raw water quality is abnormal (such as excessive residual chlorine or organic pollutants); second, check whether the membrane element is fouled or expired, and clean or replace the membrane element in time; finally, check whether the system pipeline is polluted, and clean the pipeline to ensure the taste of produced water.

Q5: Is special pretreatment required for RO membrane for drinking water system? 

A5: It is recommended to carry out simple pretreatment according to the raw water quality. For raw water with high suspended solids and colloids, filter to remove impurities; for raw water with excessive residual chlorine, carry out dechlorination treatment to avoid damaging the membrane; the pretreatment can be matched with conventional PP cotton and activated carbon filters without additional investment, which can further extend the service life of the membrane and ensure water quality safety.