NFX Nanofiltration Membrane
Background
Magnesium sulfate salt is the industry standard divalent salt used for testing the rejection of nanofiltration membranes. Due to its 120 Da molecular weight and non-fouling nature, and magnesium and sulfate being the two main dissolved ion species in seawater and brackish water. Therefore, it is important to evaluate the performance of NF membrane in terms of flux and rejection in separating MgSO4 from water. The feed solution, membrane and operational condition are listed in table1.
Feed Solution, Membrane, & Operating Conditions
| Feed Solution | |
| Material | MgSO4·7H2O |
| Molecular Weight (Da) | 120 |
| Conductivity (us/cm) | 1500 |
| Concentration(mg/L) | 2400 |
| Membrane | |
| Element | NFX-2-4040HM |
| Spacer Size (mil) | 31 |
| Surface Area (sq. ft) | 85 |
| Operating Parameters | |
| Inlet Pressure (PSI) | 110 |
| Pressure Drop (PSI) | 10 |
| Temperature (°C/°F) | 21/70 |
| Crossflow Rate (GPM) | 13 |
Test Results & Conclusions
| Performance Category | Result |
| Permeate Flux (GFD) | 22.4 |
| Rejection (%) | 99.6 |
Synder’s NFX nanofiltration membrane has proven to be very effective in rejecting MgSO4. Operating at much lower pressures than reverse osmosis membranes, the NFX is the ideal membrane for the rejection of divalent and multivalent ions. With unmatched rejection and flux, Synder’s NFX membrane is quickly becoming the preferred membrane for desalinating feed streams with divalent multivalent ion species.
