Nanofiltration membrane elements typically feature a thin-film composite (TFC) polyamide layer with a nominal molecular weight cut-off (MWCO) of approximately 200–1000 Daltons.
The molecular weight cutoff of nanofiltration membrane is between thatof reverse osmosis membrane and ultrafiltration membrane, which isabout 200-800 Daltons.Retention characteristics: Divalent and multivalentanions are preferentially retained, and the retention rate of monovalentions is related to the concentration and composition of the feed solu-tion.Nanofiltration is generally used to remove organic matter and pig-ments from surface water, hardness from groundwater and partiallyremove dissolved salts. It is used for the extraction and concentration ofsubstances in food and biopharmaceutical production. The operating pres-sure of nanofiltration membranes is generally 3.5-30bar.
| Model | Effective membrane area ft²(m²) | Water production GPD (m³/d) | Test fluid | Stable desalination rate% |
| NF1 8040 | 400 (37.2) | 12000 (45.4) | Nacl | 30-5 |
| MgSO₄ | ≥97.5 | |||
| NF2 8040 | 400 (37.2) | 12000 (45.4) | Nacl | 50-70 |
| MgSO₄ | ≥97.5 |
• Operation Pressure 100psi …………………………………………………………………………………….. (0.69MPa)
• Test solution concentration ……………………………………………………………………………………. (MgSO₄) 2000ppm
• Test solution temperature ……………………………………………………………………………………… 25℃
• Test solution pH value …………………………………………………………………………………………… 7.0 ± 0.5
• Recovery rate of single membrane element ………………………………………………………………. 15%
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