The D-Series family of proprietary thin-film nanofiltration membrane elements is characterized by an approximate molecular weight cut-off of 150-300 Dalton for uncharged organic molecules. Divalent and multivalent anions are preferentially rejected by the membrane while monovalent ion rejection is dependent upon feed concentration and composition. Since monovalent ions pass through the membrane, they do not contribute to the osmotic pressure, thus enabling D-Series nanofiltration membrane systems to operate at feed pressures below those of RO systems. Among other applications DK High Rejection NF Elements are used for dye removal/concentration, sodium chloride diafiltration and metals recovery.
Product Type
D-Series, Thin-film membrane (TFM*)
Dimension
40 in x 3.9 in
Product Specifications
| Average Permeate Flow |
Minimum NaCl Rejection (%) |
||
| (GPD) | (m³/d) | ||
| 2,000 | 7.6 | 98.0 | |
• Average salt rejection after 24 hours operation. Individual flow rate may vary ±25%
• Testing conditions: 2,000ppm MgSO4 solution at 110psi (760kPa) operating pressure, 77 °F (25°C), 15 % recovery.
Operating and Cleaning Limits
| Typical Operating Flux | Maximum Operating Pressure, Tape | Maximum Operating Pressure, Other Outerwrap | Maximum Temperature, Continuous Operation | Maximum Temperature, Clean-In-Place (CIP) | pH Range, Continuous Operation | pH Range, Clean-In-Place (CIP) | Maximum Pressure Drop, Over An Element | Maximum Pressure Drop, Per Housing | Chlorine Tolerance |
| 5-20 GFD (8–34 LMH) | 600 psi (4,137 kPa) if T<95°F (35°C) | 435 psi (3,000 kPa) if T>95°F (35°C) | 122°F (50°C) | 104°F (50°C) | 3-9 | 2-10.5 | 15 psi (103kPa) | 60 psi (414kPa) | 500 ppm hours, dechlorination recommended |