LFC Series: Low-Fouling LFC3-4040 RO Membrane

LFC Series: Low-Fouling LFC3-4040 RO Membrane

The LFC series is a high-performance low-fouling RO membrane series featuring hydrophilic surface and anti-organic fouling, and LFC3-4040 is the core model of this series.

1. Product Introduction

The LFC series is a high-performance low-fouling RO membrane series featuring hydrophilic surface and anti-organic fouling, and LFC3-4040 is the core model of this series. It is specially designed for water treatment scenarios with high organic pollution, adopting advanced aromatic polyamide composite membrane material and precise spiral wound structure, and integrating special hydrophilic modification technology, which breaks through the bottleneck of poor anti-organic fouling performance of traditional RO membranes. Different from ordinary RO membranes, the surface of LFC3-4040 is electrically neutral and highly hydrophilic, which can effectively reduce the adsorption of organic matter, colloids and microorganisms on the membrane surface, greatly reducing the fouling rate. It adopts the standard 4040 size design, which is easy to install and replace, and can be directly matched with most conventional water treatment equipment without large-scale system modification. The membrane element is vacuum-sealed and packaged with special protective solution (containing no more than 1.0% sodium bisulfite) to ensure the stability of membrane performance during transportation and storage, and is suitable for various complex water treatment environments with high organic pollution.

2. Application Scenarios

Benefiting from its excellent low-fouling, hydrophilic and anti-organic fouling performance, LFC3-4040 has a wide range of applications, focusing on water treatment scenarios with high organic pollution. 

First, municipal sewage reuse, which can be used for advanced treatment of municipal sewage, remove organic pollutants and harmful substances in sewage, and realize the recycling of water resources, which is applicable to urban greening, road cleaning and other scenarios. 

Second, industrial wastewater treatment, which is suitable for printing and dyeing, chemical, food processing and other industries with high organic wastewater, can effectively resist the pollution of organic matter in wastewater and ensure stable water production. 

Third, micro-polluted surface water purification, which is applicable to rivers, lakes and other surface water sources with high organic matter content, improving water quality and meeting the needs of drinking water and industrial water. 

Fourth, food processing water supply, which can remove organic impurities in water, provide high-quality water sources meeting food-grade standards, and ensure food safety. In addition, it can also be used in groundwater remediation and high-organic-pollution emergency water supply scenarios, providing flexible and reliable water treatment solutions.

3. Technical Parameters

The technical parameters of LFC3-4040 are precisely optimized to fully adapt to high-organic-pollution water treatment scenarios, and the core parameters are as follows: the membrane material is aromatic polyamide composite membrane with hydrophilic modification, which is non-toxic and harmless, with strong chemical stability, and the service life can reach 3-5 years; the desalination rate is ≥99.5%, the organic matter rejection rate is ≥98.0%, and the produced water meets the industrial and drinking water standards; the recommended operating pressure is 0.8-1.2MPa, which is compatible with conventional water treatment systems and has low energy consumption; the operating temperature is 5-45℃, the inlet water pH value is 2-10 (optimal 6.5-7.5), the inlet water Silt Density Index (SDI) is ≤5, and the inlet water turbidity is ≤1NTU; under standard conditions (25℃, 1.0MPa), the water production flux is 28-38m³/(m²·d), and the single membrane recovery rate is 18%; the physical size is 4040 standard size, the outer diameter × length is 3.88×40 inches, the dry weight is 5.4kg, and the effective membrane area is 8.9㎡; the cleaning cycle is 30-40 days, which is 20% longer than that of ordinary RO membranes, and the flux recovery rate after cleaning is ≥96%.

4. Product Advantages

The core advantages of LFC3-4040 are concentrated in low fouling, hydrophilic surface and strong anti-organic fouling, which accurately solve the pain points of high-organic-pollution water treatment. 

First, strong anti-organic fouling performance, the membrane surface is electrically neutral and hydrophilic, which can effectively reduce the adsorption of organic matter, colloids and microorganisms, and the fouling rate is reduced by 30% compared with ordinary RO membranes. 

Second, long cleaning cycle, the unique surface modification technology and spiral flow channel design delay fouling, the cleaning cycle is extended to 30-40 days, reducing cleaning frequency and operation and maintenance costs. 

Third, stable water production performance, the desalination rate and organic matter rejection rate are stable for a long time, and the performance attenuation is small during long-term operation, which can maintain stable water production under complex water quality conditions. 

Fourth, high hydrophilicity and easy cleaning, the hydrophilic surface makes the membrane not easy to adhere to pollutants, and even if fouling occurs, it can be quickly cleaned and restored, with a flux recovery rate of more than 96%. 

Fifth, convenient installation and maintenance, the standard 4040 size is compatible with most conventional water treatment systems, each membrane element is equipped with a concentrated water sealing ring and connection adapter, and installation and replacement can be completed without professional technical personnel.

5. Application Procedures

Combined with years of practical experience, the application procedures of LFC3-4040 are simple and standardized, which is convenient for users to operate. Pre-installation preparation: Check the integrity of the membrane element, confirm that the surface and sealing ring are not damaged, and check that the protective solution is intact; clean the system pipeline, remove impurities such as rust and sediment, and prepare installation tools and monitoring instruments. Membrane element installation: Install it into the pressure vessel according to the instructions, 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 1.0MPa, adjust the flow rate to the recommended value, run the system for 30-60 minutes, and check whether the water production parameters are normal. Normal operation: Regularly monitor the pressure, flux, desalination rate and organic matter rejection rate, and keep records. If the pressure increases by 0.2MPa or the flux decreases by 20%, clean it in time. Membrane cleaning: Prepare a special cleaning solution for organic pollution, 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 the protective solution when not in use for a long time.

6. Quality Standards

LFC3-4040 strictly follows the dual international and domestic quality standards to ensure reliable and stable product performance. Internationally, it follows the ISO 9001 quality management system and ASTM D4516 test method; domestically, it complies with GB/T 30307-2013 "Reverse Osmosis Membrane Elements for Water Treatment" and GB/T 5749-2022 "Sanitary Standards for Drinking Water". Core quality requirements: The membrane material meets food-grade standards, no harmful substances are leached; the desalination rate is ≥99.5%, the organic matter rejection rate is ≥98.0%, the flux recovery rate after cleaning is ≥96%, and each unit is subjected to 30 minutes of stable testing before leaving the factory; the membrane can withstand a maximum pressure of 30bar (435psi), no deformation or water leakage, and the maximum pressure drop is ≤0.8bar (11.6psi); the anti-fouling and corrosion resistance performance reaches the advanced level of the industry, and it can operate stably in high-organic-pollution water environment for a long time; each batch of products has a unique production batch number and test report, which is fully traceable, and the deviation range of water production is within ±15%, and the deviation range of effective membrane area is within ±3%.

7. Working Principle

LFC3-4040 realizes efficient water treatment and anti-organic fouling based on the reverse osmosis principle combined with hydrophilic modification technology and spiral wound structure 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 on the high concentration side (raw water side), forcing water molecules to pass through the semi-permeable membrane to the low concentration side (produced water side), while retaining organic matter, salts, heavy metals and other harmful substances. The membrane element adopts a dense aromatic polyamide composite membrane with a pore size of only 0.1-0.2 nanometers, which only allows water molecules to pass through. The special hydrophilic modification makes the membrane surface highly hydrophilic and electrically neutral, reducing the adsorption of organic matter and colloids. The spiral wound structure rolls the membrane sheet, flow channel net and collection pipe into a spiral shape, making the water flow evenly distributed on the membrane surface, generating a gentle scouring force, which can timely wash away the pollutants attached to the membrane surface, further delaying fouling and ensuring stable operation.

8. Future Prospects

With the deepening of environmental protection and the continuous expansion of high-organic-pollution water treatment demand, the LFC series and LFC3-4040 models, with their excellent low-fouling and anti-organic fouling advantages, have broad development prospects. In the future, this model will be intelligently upgraded, integrating Internet of Things and sensor technology to realize real-time monitoring of membrane fouling degree and automatic reminder of cleaning and maintenance, which is in line with the development trend of intelligent water treatment systems. It will also continuously optimize the hydrophilic modification technology and membrane material performance, further improve the anti-organic fouling performance and water production flux, and reduce energy consumption. At the same time, it will expand application scenarios to new energy, new materials and other emerging fields, and promote green and low-carbon development, improve the recycling rate of waste membranes, and reduce environmental pollution. In addition, it will provide one-stop services, covering product supply, installation and commissioning, maintenance and technical guidance, to improve user experience.

9. Conclusion

As the core model of the LFC series low-fouling RO membrane with hydrophilic surface and anti-organic fouling, LFC3-4040 takes the hydrophilic modified aromatic polyamide composite membrane as the core and the spiral wound structure as the support, focusing on the core advantages of low fouling, hydrophilic surface and strong anti-organic fouling. It effectively solves the pain points of traditional RO membranes such as easy fouling, frequent cleaning and high operation and maintenance costs in high-organic-pollution water treatment scenarios. Its quality meets international and domestic standards, adapts to various high-organic-pollution water treatment scenarios, can efficiently remove organic matter and other impurities in water, ensure stable water production, and provide reliable high-quality water sources for industrial production and daily life. With the continuous optimization of technology, LFC3-4040 will play a more important role in the field of water treatment, helping to promote the green and sustainable development of the water treatment industry.

10. Frequently Asked Questions (FAQs)

Q1: What is the core function of LFC3-4040? 

A1: The core function is to realize efficient water purification through the reverse osmosis principle, with the characteristics of low fouling, hydrophilic surface and anti-organic fouling, which can effectively retain organic matter, salts, heavy metals and other harmful substances in water, and ensure stable water production in high-organic-pollution scenarios.

Q2: What is the service life of LFC3-4040, and how to extend it? 

A2: The service life is 3-5 years under normal maintenance. Regularly clean the membrane element according to the fouling situation, keep the operating parameters stable, replace the damaged sealing ring in time, and properly store it in the protective solution when not in use for a long time, which can extend the service life.

Q3: Can this model be used for seawater desalination? 

A3: No, it is mainly designed for high-organic-pollution water treatment scenarios such as municipal sewage reuse and industrial wastewater treatment. Seawater has high salt content and requires a high-pressure RO membrane, so it is not suitable for direct use in seawater desalination projects.

Q4: What should I do if the water production flux decreases during operation? 

A4: First, check whether the inlet water organic matter content is abnormal. If the water quality is normal, it indicates that the membrane is fouled, and the membrane element should be cleaned in time with a special cleaning solution for organic pollution. If the flux still does not recover after cleaning, check whether the membrane is damaged and replace it in time.

Q5: Is special pretreatment required? 

A5: It is recommended to carry out simple pretreatment, filter to remove suspended solids and colloids in water, remove residual chlorine (control ≤0.1ppm), reduce membrane pollution and extend service life. The pretreatment can be matched with conventional equipment without additional investment, which is especially important for high-organic-pollution scenarios.