Seawater Membrane
Model: 4021/4040/8040
Water Rate: 750/1,600/6,800 GDP
Max. Working Pressure: 800 psi
Replace: Every 18 months or as needed
Salt Rejection: 99.5%
Max. Feedwater Temperature: 45°C
Max. Feedwater SDI: 5
Maximum Feed Water Turbidity: 1 NTU
Seawater Reverse Osmosis Membrane: Turn Seawater into Freshwater Efficiently
Our seawater desalination membrane utilizes advanced aromatic polyamide composite materials to produce high-performance freshwater from seawater (TDS up to 45,000 ppm) and brackish water. Key benefits include:
✅ 99.5%+ stable salt rejection via single-stage RO, eliminating multi-step treatment
✅ Reduced energy costs with low-pressure operation (800psi test pressure)
✅ Compact design cuts system footprint and capital investment (fewer elements needed)
✅ Durable construction resists biofouling and chemical degradation in harsh marine environments
Suitable for coastal cities, offshore platforms, power plants, and arid regions facing water scarcity.
Technical Specifications
|
Model |
SW-2521 |
SW-4021 |
SW-2540 |
SW-4040 |
SW-8040 |
|
Effective Membrane Area ft²(m²) |
12(1.1) |
800(3.02) |
28(2.6) |
80(7.4) |
380(35.2) |
|
Average Water Production GPD(m³/d) |
250(0.95) |
750(2.84) |
600(2.3) |
1600(6.1) |
6800(25.7) |
|
Stabilized Desalination Rate % |
99.5 |
99.5 |
99.5 |
99.5 |
99.7 |
|
Minimum Desalination Rate % |
99.3 |
99.3 |
99.3 |
99.3 |
99.5 |
|
Membrane Media |
Aromatic Polyamide |
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|
Construction |
Spiral Wound |
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|
Test Pressure |
800psi (5.5MPa) |
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|
Test Water Temperature |
25℃ |
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|
PH Value of Test Solution |
7.5 |
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|
Test Solution Concentration (NaCl) |
32800ppm |
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|
Recovery Rate of Single RO Element |
8% (Model: 8040/4040/2540) |
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|
4% (Model: 4021/2521 |
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Operating Limits & Conditions
|
Production floating range |
±15% |
|
Maximum feed water temperature |
45℃ |
|
Maximum feed water SDI15 |
5 |
|
Maximum influent turbidity NTU |
1 |
|
Maximum residual chlorine concentration |
0.1ppm |
|
Maximum Operating pressure |
1000psi(6.9Mpa) |
|
Maximum pressure drop of single membrane element |
10psi(0.07Mpa) - Model: 4021/2521 |
|
15psi(0.1Mpa) - Model: 8040/4040/2540 |
|
|
PH value range of feed water during continuous operation |
3~10 |
|
PH value range of feed water during chemical cleaning |
2 ~12 |
|
Maximum feed water flux |
6gpm(1.4m³/h) - Model: 2521, 2540 |
|
16gpm(3.6 m³/h) - Model: 4021, 4040 |
|
|
75gpm(17m³/h) - Model: 8040 |
Seawater membrane features
Exceptional Desalination Efficiency
Stable 99.5%+ salt rejection even with fluctuating feedwater salinity (15,000–40,000 ppm).
Anti-Fouling & High-Pressure Resilience
Reinforced materials and anti-pollution surface technology minimize scaling, extending service life.
Hypersaline Compatibility
Ideal for seawater desalination plants and industrial wastewater reuse systems.
Eco-Friendly Water Reuse
Converts high-salinity wastewater into reusable water for agriculture, manufacturing, or municipal use.
Energy-Saving Low-Pressure Operation
Reduces energy consumption vs. conventional membranes without sacrificing flow rates.
FAQ
Q1: What is the typical lifespan of the seawater membrane?
A: 3–5 years, depending on feedwater quality and maintenance frequency. Regular cleaning (per operating manual) extends durability.
Q2: Can this membrane handle extreme seawater conditions (e.g., high turbidity)?
A: Yes, but pre-treatment (e.g., filtration) is recommended for feedwater with SDI15 >5 or turbidity >1 NTU to prevent fouling.
Q3: What industries can benefit from this membrane?
A: Coastal municipalities, offshore oil/gas platforms, power generation, mining, and tourism sectors in water-scarce regions.
Q4: Is technical support available for system integration?
A: Yes, our engineering team provides free guidance on membrane selection, system design, and optimization.
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