EN 
Category Introduction
The Nanofiltration Membrane series is suitable for brine purification, heavy metal removal, material desalination and concentration, sodium chloride solution recovery, and COD removal from wastewater. With a molecular weight cutoff of approximately 200 Daltons, it offers high retention of most divalent and polyvalent ions while allowing permeation of monovalent salts.
The optimized 34-mil inlet flow channel reduces pressure drop and enhances the membrane element's resistance to fouling and cleaning. It is widely used in zero wastewater discharge, chlor-alkali denitrification, lithium extraction from salt lakes, material decolorization, and material separation.
Product Information
| Model | Salt Rejection (%) |
Salt Rejection (%) |
Permeate Flow | Effective Membrane Area | Spacer Thickness |
| 500 ppm NaCl | 2000ppm MgSO4 | GPD(m³/d) | ft2(m2) | (mil) | |
| NF90-4040 | ＞90 | ≥98 | 1800(6.8) | 85(7.9) | 34 |
| Testing Conditions | Operating pressure | 70 psi(0.48 Mpa) | |||
| Test solution temperature | 25 ℃ | ||||
| Test solution concentration | 500 ppm NaCl; 2000ppm MgSO4 | ||||
| PH value | 7-8 | ||||
| Recovery rate of a single membrane element | 15% | ||||
| Flow range of a single membrane element | ±15% | ||||
| Operating Conditions & Limits | Maximum operating pressure | 600 psi(4.14MPa) | |||
| Maximum temperature | 45 ℃ | ||||
| Maximum feedwater flow | Maximum feedwater flow: 4040-16gpm(3.6m3/h) | ||||
| Maximum feedwater flow SDI15 | 5 | ||||
| Maximum concentration of free chlorine: | ＜0.1ppm | ||||
| Allowed pH range for chemical cleaning | 2-11 | ||||
| Allowed pH range for feedwater in operation | 1-13 | ||||
| Maximum pressure drop per element | 15psi(0.1MPa) | ||||
