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Nanofiltration Membrane
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Zibo Dongqiang Membrane Technology Co., Ltd.
Shandong, China
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  • The molecular weight cut-off of the nanofiltration membrane is between reverse osmosis membrane and ultrafiltration membrane, about 200-800 Daltons.
  •  Retention characteristics: preferential retention of divalent and multivalent anions, and the retention rate of monovalent ions is related to the concentration and composition of the feed liquid.
  •  Nanofiltration is generally used to remove organic matter and pigments in surface water, hardness in groundwater and partially remove dissolved salts, and is used for extraction and concentration of substances in food and biomedical production. 
  • The operating pressure of the nanofiltration membrane is generally 3.5-30 bar.
  • We offer a wide range of fine molecular weight cut-off rolled NF membrane elements with compact structure and reasonable surface area/volume ratio. 
  • By using different flow channel network, (13-120mil) can change the width of the material liquid flow channel, adapt to the material liquid of various viscosity. 
  • In order to meet the application of some special industries, we can select suitable nanofiltration membranes for customers according to customer process requirements, different treatment systems and related technical requirements.
Commonly used nanofiltration membrane performance parameters
Membrane flux: GFD, gallons per square foot per day; LMH, liters per square meter per hour
Water production: GPD, gallons per day; GPM, gallons per minute; m3/d, cubic meters per day
System recovery rate: W%, filtrate flow/feed flow*100%
The retention rate of a certain substance: X%, (1-the concentration of a certain substance in the filtrate/the concentration of a certain substance in the concentrate)*100%
The transmission rate of a certain substance: Y%, the concentration of a certain substance in the filtrate/the concentration of a certain substance in the dope*100%
Volume concentration ratio: VCR, initial feed volume/concentrate volume
Solution osmotic pressure: π, ionic molarity * gas constant * thermodynamic temperature
Solution NaCl NaCl NaHCO3 NaSO4 MgSO4 MgCl2 CaCl2 Sucrose Glucose
Concentration (mg/l) 35000 1000 1000 1000 1000 1000 1000 1000 1000
Osmotic pressure (Kgf/cm2)     28 0.8 0.9 0.4 0.25 0.7 0.6 0.07 0.14

Nanofiltration membrane element 100D-800D
Working temperature 4-55℃
PH value 2-11
Nanofiltration inlet pressure <4.1MPa
Nanofiltration working pressure 0.8-1.6MPa (recommended)
Common types of nanofiltration membranes 1812, 2540, 4040, 8040
Nanofiltration membrane material polyamide

1. Demineralized water treatment
2. Chemical wastewater treatment
3. Recycling of precious metals
4. Removal of harmful substances in drinking water
5. Dye decolorization or concentration, heavy metal removal, acid purification
6. Concentration and refining of various proteins, amino acids, and vitamins in the fields of food, beverages, and pharmaceuticals

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