SWC Ultra: Ultra-High Desalination Seawater RO Membrane

SWC Ultra: Ultra-High Desalination Seawater RO Membrane

SWC Ultra is a high-performance seawater RO membrane specially designed for high-salinity seawater desalination scenarios, with the core characteristic of ultra-high desalination rate. 

Adopting advanced high-crosslinking aromatic polyamide composite membrane material, combined with optimized spiral wound structure and iLEC interlocking end cap design, it integrates ultra-precision desalination and stable operation optimization, which can stably operate in high-salinity seawater environments. Different from ordinary seawater RO membranes, SWC Ultra optimizes the membrane molecular structure, enhances the salt rejection capacity, and its dense membrane surface can effectively block various salts and harmful substances. It adopts standard 8-inch modular design, with an effective membrane area of 37 square meters, which is easy to install and replace, and can be directly matched with most large-scale seawater desalination systems without large-scale modification. The membrane element is vacuum-sealed and packaged with special protective solution (containing no more than 1.0% sodium bisulfite), ensuring stable performance during transportation and storage, and adapting to various seawater desalination environments such as coastal areas, offshore platforms and islands. As a high-end seawater membrane, it is committed to providing efficient and stable fresh water solutions for high-salinity marine environments.

2. Application Scenarios

Benefiting from its core advantage of ultra-high desalination rate, SWC Ultra has a wide range of applications, focusing on high-salinity seawater desalination scenarios. First, large-scale seawater desalination projects, which are suitable for coastal cities and water-scarce coastal areas, can efficiently treat high-salinity seawater, provide large-scale qualified fresh water for municipal water supply and industrial production, and alleviate water scarcity. Second, offshore platform water supply, which is applicable to offshore oil and gas platforms, can stably produce fresh water from high-salinity seawater, meeting the living and production water needs of platform personnel, without relying on onshore water supply. Third, coastal industrial water treatment, which is suitable for coastal chemical, power and other industries that use seawater as raw water, can remove salts and harmful substances in high-salinity seawater, providing qualified process water and reducing the impact of high salt content on production equipment. Fourth, island fresh water supply, which is applicable to offshore islands with scarce fresh water resources, can efficiently desalinate seawater, solving the fresh water demand of island residents and tourism projects. In addition, it can also be used in emergency seawater desalination scenarios such as marine disasters, providing timely fresh water support, which is in line with the practical needs of modern seawater desalination technology applications.

3. Technical Parameters

The technical parameters of SWC Ultra are precisely optimized to fully reflect its core characteristic of ultra-high desalination rate, and the core parameters are as follows: the membrane material is high-crosslinking aromatic polyamide composite membrane, non-toxic and harmless, with excellent chemical stability and anti-pollution performance, and the service life can reach 3-5 years; the nominal desalination rate is ≥99.85%, the minimum desalination rate is ≥99.5%, the boron rejection rate is ≥92%, the organic matter rejection rate is ≥98.5%, and the produced water meets national industrial and drinking water standards; the recommended operating pressure is 5.5-6.5MPa, which is suitable for high-salinity seawater desalination systems; the operating temperature is 5-45℃, the inlet water pH value is 2-11 (cleaning pH value is 1-13), the inlet water Silt Density Index (SDI) is ≤5, and the inlet water turbidity is ≤1NTU; under standard conditions (25℃, 6.0MPa), the water production flux is 32-42m³/(m²·d); the single membrane recovery rate is 8-10%; the physical size is 8-inch standard size, the outer diameter × length is 8.0×40 inches, the dry weight is 22.5kg, and the effective membrane area is 37㎡; the cleaning cycle is 30-40 days, and the flux recovery rate after cleaning is ≥96%; the membrane can withstand a maximum pressure of 8.28MPa (1200psi), and the maximum pressure drop is ≤1.0bar (14.5psi).

4. Product Advantages

The core advantage of SWC Ultra is its ultra-high desalination rate, which accurately solves the key pain points of high-salinity seawater desalination. 

First, ultra-high desalination performance: the nominal desalination rate is as high as 99.85%, which can effectively remove salts, heavy metals, boron and other harmful substances in high-salinity seawater, ensuring that the produced water TDS is ≤500mg/L, fully meeting drinking and industrial water standards. 

Second, stable performance in high-salinity environments: it can stably operate in seawater with TDS up to 45000mg/L, with small performance attenuation, solving the problem of insufficient desalination of traditional membranes in high-salinity environments. 

Third, excellent chemical stability: the high-crosslinking membrane material has strong resistance to acid, alkali and oxidants, adapting to the complex water quality of seawater and extending the service life. 

Fourth, efficient and energy-saving: optimized structural design reduces water flow resistance, realizes high-flux operation under reasonable pressure, and reduces system energy consumption when used with energy recovery systems. 

Fifth, convenient installation and maintenance: the standard 8-inch modular design is compatible with most large-scale seawater desalination systems, and the iLEC interlocking end cap design reduces leakage risks, making installation and replacement more convenient, saving maintenance time and cost, and its optimized design also improves cleaning performance.

5. Application Procedures

Combined with years of practical experience, the application procedures of SWC Ultra are simple and standardized, which is convenient for users to operate, and special attention should be paid to pressure control and seawater pretreatment during operation. Pre-installation preparation: Check the integrity of the membrane element, confirm that the surface, sealing ring and iLEC interlocking end cap 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 (especially salt content, temperature and pressure monitors). Membrane element installation: Install it into the 8-inch 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 6.0MPa, adjust the flow rate to the recommended value, run the system for 30-60 minutes, and check whether the desalination rate, flux and other parameters are normal. Normal operation: Regularly monitor the pressure, flux, desalination rate, water temperature and water quality, and keep records. If the pressure increases by 0.2MPa or the flux decreases by 20%, clean it in time. Membrane cleaning: According to the pollution type, prepare a special cleaning solution (acidic or alkaline), 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 iLEC interlocking end cap, and properly store it in the 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 regularly carry out pollution identification in accordance with relevant standards to ensure stable operation.

6. Quality Standards

SWC Ultra strictly follows the dual international and domestic quality standards to ensure reliable and stable product performance, especially meeting the requirements of high-salinity seawater desalination. Internationally, it follows the ISO 9001 quality management system, ASTM D4516 test method and ISO 20466:2024 performance classification guidelines; domestically, it complies with GB/T 30307-2013 "Reverse Osmosis Membrane Elements for Water Treatment", GB/T 5749-2022 "Sanitary Standards for Drinking Water", HJ/T 270-2006 "Technical Requirements for Environmental Protection Products - Reverse Osmosis Water Treatment Equipment" and relevant marine industry standards issued by the Ministry of Natural Resources. Core quality requirements: The membrane material meets food-grade standards, no harmful substances are leached; the nominal desalination rate is ≥99.85%, the boron rejection rate is ≥92%, the flux recovery rate after cleaning is ≥96%, and each unit is subjected to 30 minutes of stable testing before leaving the factory, including structure integrity detection to ensure product reliability; the membrane can withstand a maximum pressure of 8.28MPa (1200psi), no deformation or water leakage, and the maximum pressure drop is ≤1.0bar (14.5psi); the desalination performance and stability in high-salinity environments reach the advanced level of the industry, and it can operate stably in complex seawater 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

SWC Ultra realizes efficient seawater desalination and ultra-high desalination rate based on the reverse osmosis principle, combined with high-crosslinking membrane material technology and optimized spiral wound structure design, which is consistent with the core principle of modern RO membrane separation technology. 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 (5.5-6.5MPa) on the high concentration side (raw water side, i.e., seawater side), forcing water molecules to pass through the semi-permeable membrane to the low concentration side (produced water side), while retaining salts, heavy metals, boron, organic matter and other harmful substances. The high-crosslinking aromatic polyamide composite membrane adopted by this model has a dense structure and a pore size of only 0.1-0.2 nanometers, which only allows water molecules to pass through, ensuring ultra-high desalination rate. The optimized spiral wound structure makes the water flow evenly distributed on the membrane surface, generating a gentle scouring force to wash away attached pollutants, delaying membrane fouling, and ensuring stable operation in high-salinity seawater environments.

8. Future Prospects

With the increasing global water scarcity and the continuous expansion of seawater desalination projects, SWC Ultra, with its core advantage of ultra-high desalination rate, has 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 water quality, membrane performance, temperature and pressure, and automatic reminder of cleaning and maintenance, which is in line with the development trend of intelligent water treatment. It will also continuously optimize the membrane material and structural design, further improve the desalination rate and anti-pollution performance, expand the applicable TDS range of seawater, and reduce energy consumption when used with energy recovery systems. At the same time, it will expand application scenarios to new energy, marine engineering and other emerging fields, promote the recycling of seawater resources, 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 further improve user experience and meet the diverse needs of high-salinity seawater desalination projects, and comply with the development direction of marine environmental protection and water resource utilization standards.

9. Conclusion

As a high-performance ultra-high desalination seawater RO membrane, SWC Ultra takes high-crosslinking aromatic polyamide composite membrane as the core and optimized spiral wound structure as the support, integrating iLEC interlocking end cap design and high-efficiency desalination technology, and fully conforms to international and domestic strict quality standards such as ISO 9001, GB/T 30307-2013 and relevant marine industry standards. It is specially developed to solve the key pain points of traditional seawater RO membranes in high-salinity seawater desalination scenarios, such as insufficient desalination rate, unstable performance and easy attenuation. Through its optimized membrane molecular structure and dense surface design, SWC Ultra achieves ultra-high desalination performance of ≥99.85%, effectively removing salts, heavy metals, boron and other harmful substances in high-salinity seawater, ensuring that the produced water fully meets drinking and industrial water standards. Widely applicable to large-scale seawater desalination, offshore platform water supply, coastal industrial water treatment and island fresh water supply, SWC Ultra not only realizes efficient seawater desalination and fresh water supply, but also reduces system operation and maintenance costs, providing reliable technical support for seawater desalination projects in complex marine environments. With its stable operation performance, long service life and convenient installation and maintenance, it has become a core choice for related seawater desalination projects. Looking forward, with the continuous optimization of membrane material technology and intelligent upgrading, SWC Ultra will further improve its desalination efficiency and environmental adaptability, expand its application scenarios, and play a more important role in the field of seawater desalination, helping to promote the green, efficient and sustainable development of the global water treatment industry and make greater contributions to solving water resource scarcity and marine resource utilization issues.

10. Frequently Asked Questions (FAQs)

Q1: What is the core function of SWC Ultra? A1: The core function is to realize efficient seawater desalination through the reverse osmosis principle, with the core characteristic of ultra-high desalination rate, which can effectively retain salts, heavy metals, boron and other harmful substances in high-salinity seawater, and provide stable and qualified fresh water in complex marine environments.

Q2: What is the service life of SWC Ultra, 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, avoid long-term contact with strong oxidants, check and replace the damaged sealing ring and iLEC interlocking end cap in time, and properly store it in the protective solution when not in use for a long time; proper pretreatment and regular pollution identification can also effectively extend the service life.

Q3: What is the applicable TDS range of SWC Ultra? A3: It is mainly applicable to seawater with a TDS of 35000-45000mg/L, which can adapt to slight fluctuations in salt content, and is suitable for most marine environments such as coastal areas, offshore platforms and islands.

Q4: What should I do if the desalination rate decreases during operation? A4: First, check whether the inlet water TDS, temperature and pH value are abnormal; second, check whether the membrane is fouled, and clean the membrane element in time with a special cleaning solution; finally, check whether the operating pressure is within the recommended range, and adjust it in time to ensure stable desalination performance.

Q5: Is special pretreatment required for SWC Ultra? A5: It is recommended to carry out targeted pretreatment according to the seawater quality. For seawater with high suspended solids and colloids, filter to remove impurities; for seawater containing residual chlorine, carry out dechlorination treatment to avoid damaging the membrane; the pretreatment can be matched with conventional equipment without additional investment, which can further extend the service life of the membrane and ensure stable ultra-high desalination performance.