Specially developed for high-salinity seawater treatment, Coalescing Filter supporting SW RO membrane is high-pressure resistant seawater reverse osmosis membrane designed for 32000ppm original sea water, totally different from brackish BW series RO membrane. The thickened aromatic polyamide film layer of this sea water desalination membrane can bear maximum 8.28MPa operating pressure, maintaining stable ≥99.7 salt rejection rate under long-term high salt raw water running. Ordinary low-pressure high salt RO element will suffer rapid performance decay when applied to seawater, while SW series strengthens membrane surface anti-scaling coating to slow salt crystal fouling speed, greatly extending chemical cleaning cycle. All SW membrane products are classified under Water Filter Element (RO & UF Membrane) product category, matched with front UF membrane module and High Flow Filter to form complete seawater desalination pretreatment system.
Working Principle of SW Seawater RO Membrane Element
Under high 5.52-8.28MPa driving pressure, high-salinity seawater flows tangentially over the surface of SW RO membrane. Small pure water molecules penetrate the reinforced polyamide film layer and gather in the central permeate tube to form fresh drinking water; sodium chloride, magnesium and other salt ions, marine algae and suspended solids are fully intercepted on the membrane surface and discharged with concentrated brine. The spiral winding structure of this sea water desalination membrane enlarges effective filtration area, ensuring stable daily water output of desalination equipment even under full load continuous operation.
Core Technical Index of SW Membrane
Test Raw Water Concentration: 32000ppm NaCl seawater
Stable Salt Rejection Rate: ≥99.7%
Max Continuous Operating Pressure: 8.28MPa (1200psi)
Allowed pH Range (Continuous): 2-11
Membrane Material: Thickened high-pressure aromatic polyamide composite film
Every batch of high salt RO element undergoes high-pressure salt rejection aging test before shipment, supporting small 4-inch and large 8-inch two mainstream sizes, suitable for island small desalination equipment and large coastal water plant EPC projects.
Four Major Product Advantages
1 Super High Salt Tolerance
Specially optimized seawater reverse osmosis membrane works normally under 3200ppm full-strength seawater environment without performance drop.
2 Reinforced High Pressure Resistant Film
Thickened polyamide substrate avoids membrane rupture under long-term high operating pressure of desalination system.
3 Anti-Scaling Modified Surface Coating
Reduce salt crystal adhesion, extend membrane chemical cleaning interval and lower maintenance cost.
4 Complete Size Series
25/40/8-inch multiple specifications adapt small marine platform to large coastal desalination stations.
Application Scenarios
SW sea water desalination membrane is core component of island fresh water equipment, coastal municipal seawater desalination plants, offshore drilling platform pure water systems and high-salinity industrial wastewater zero-discharge projects. Matched with PVDF UF membrane module pretreatment, it meets drinking water standard after single-stage desalination, and can cooperate with Oil & Gas Purification Equipment marine platform gas filter products for integrated marine fluid treatment solutions.
Full SW Series Complete Model List
LF-SW1-4021, LF-SW1-4040, LF-SW2-8040, LF-SW2-8040PRO, LF-SW3-2540
Other Related Products
BW Series Brackish Water RO Membrane
FAQ About SW Seawater RO Membrane
Q1 What is the applicable raw water for SW RO membrane?
A1 This high salt RO element is exclusively for seawater and high-salinity brine over 30000ppm, not for ordinary tap water brackish water.
Q2 What is the maximum working pressure of sea water desalination membrane?
A2 Long-term safe operating pressure up to 1200psi (8.28MPa), far higher than conventional BW RO membrane.
Q3 Can SW membrane directly use without pretreatment?
A3 Must be equipped with UF membrane module and high flow security filter to remove suspended solids and algae to prevent membrane fouling.
Q4 What is the standard salt rejection of SW series?
A2 Under standard seawater test conditions, stable salt rejection rate reaches ≥99.7%.
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