SW4021 Seawater RO Membrane Mini High Pressure Desalination Membrane
Introduction:SW4021 seawater RO membrane is a professional compact-grade seawater desalination membrane, filling the market gap of small-sized high-salinity water treatment elements. Traditional 8040 seawater membranes are bulky and only suitable for large industrial plants, while the SW4021 model adopts a refined 4-inch × 21-inch compact structure, perfectly matching mini skid-mounted seawater equipment and mobile water purification systems. Adopting upgraded high-density polyamide thin film composite material, it has stronger pressure resistance and salt interception capability than ordinary brackish water membranes. It can operate stably under extreme high-salinity seawater conditions, with stable desalination performance and low attenuation rate. It is a cost-effective replacement for imported small seawater membrane elements, widely favored by marine and island water treatment projects.
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Product parameter:
We specialize in the supply of high-quality filtration consumables, including precision Liquid Filters and durable industrial filter elements to support full water pretreatment. The SW4021 Seawater RO Membrane is a compact high-pressure desalination element uniquely designed for small-scale seawater and high-salinity water treatment. Different from conventional large-size seawater membranes, this 4021 mini seawater RO membrane features small footprint, high pressure resistance and ultra-high salt rejection. It stably removes chloride ions, sodium salts and various mineral impurities from high-TDS seawater and brackish water. Ideal for island residential water supply, shipborne water purifiers and offshore small desalination units, it provides efficient and reliable seawater purification solutions for compact engineering projects.
Working Principle
The SW4021 seawater RO membrane adopts high-pressure driven reverse osmosis separation technology exclusive for salt water. Under the standard high working pressure of seawater systems, raw seawater flows uniformly through the dense membrane surface. The ultra-fine polyamide barrier layer efficiently intercepts almost all dissolved salt ions, tiny colloids and marine suspended pollutants. Only pure water molecular groups can penetrate the membrane layer to produce qualified fresh water, while concentrated salt water is discharged separately. Cooperated with front-end Liquid Filters for multi-stage precision pretreatment, it effectively removes marine particulate impurities, prevents membrane surface abrasion and salt crystal deposition, and ensures long-term stable operation of the compact seawater desalination system.
Technical Specifications
Item | Parameter |
|---|---|
Model | SW4021 Seawater RO Membrane |
Membrane Material | High Density Polyamide Thin Film Composite |
Nominal Water Flow | 2400 GPD |
Salt Rejection Rate | ≥99.6% |
Effective Membrane Area | 210 sq.ft |
Standard Test Pressure | 800 psi (5.5 MPa) |
Max Feed Water TDS | 42000 ppm |
Operating Temperature | 5℃–45℃ |
Working pH Range | 2–11 |
Feed Water SDI | ≤3 |
Product Size | 4 inch × 21 inch |
Core Advantages
Mini compact & space-saving design:
Unique 4021 small-size structure, perfectly suitable for mobile, ship-mounted and space-limited seawater desalination equipment, no redundant space occupation.
Ultra-high salt rejection performance:
Professional seawater-grade membrane formula, stably maintaining 99.6% high desalination rate, effectively converting high-salinity seawater into usable fresh water.
Super high pressure resistance:
Withstands 5.5MPa long-term high-pressure operation, adapts to harsh seawater working conditions, no deformation or performance decay.
Strong salt crystallization resistance:
Optimized smooth hydrophilic membrane surface reduces salt crystal adhesion and marine microbial fouling, lowering cleaning frequency.
Professional mini seawater replacement solution:
Fills the gap of small seawater membrane elements, fully compatible with standard 4021 membrane housings, direct plug-and-play replacement.
Application Scenarios
Island resident domestic water supply and small desalination projects
Ship, yacht and marine mobile seawater purification system
Offshore small platform and coastal monitoring station water treatment
Portable skid-mounted seawater desalination equipment
High-salinity brackish water and salt lake water small-scale purification
Laboratory seawater desalination test and pilot research projects
FAQ
Q1: What is the difference between SW4021 and ordinary 4040 RO membrane?
A1: Ordinary 4040 membranes are only for low-salinity brackish water. SW4021 is professional seawater grade, which can withstand 5.5MPa high pressure and adapt to 42000ppm high TDS seawater with higher salt rejection.
Q2: Can SW4021 membrane be used on mobile desalination equipment?
A2: Absolutely yes. Its compact size and stable high-pressure resistance make it the best choice for mobile and shipborne seawater treatment devices.
Q3: What pretreatment does SW4021 seawater membrane need?
A3: It needs multi-stage precision Liquid Filters to control feed water SDI≤3, remove marine suspended solids and protect the membrane from abrasion and fouling.
Q4: What is the service life of SW4021 seawater RO membrane?
A4: With standard pretreatment and regular chemical maintenance, the service life can reach 2 years with stable desalination performance.
Q5: Is it compatible with standard 4021 membrane pressure vessel?
A5: 100% universal, standard industry size, no equipment modification required for direct replacement.
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