|Membrane Material||Polysulfone, PESU|
|Model Name/Number||NF4040 - 70|
NANO FILTRATION MEMBRANE(NF)
Effective Membrane Area
Permeate Flow Rate
Average Cacl2 Rejection
Average MgSO4 Rejection
Average NaCl Rejection
400 ft2 (37.2 m2)
1. Test Conditions 2%Lactose Solution at 110PSI (7.6 Bar) operating pressure, 77 F (25 C)
2. Test Conditions 2,000ppm MgSO Solution at 110PSI (7.6 Bar) operating pressure, 7 F (2 C)
3. Test Conditions 2,000ppm NaCl Solution at 110PSI (7.6 Bar) operating pressure, 77 F (25 C
4. Permeate fow rate for each element may vary but will be no more than 20%.
5. All elements are vacuum sealed in a polyethylene bag containing 1.0% SBS (sodium bisulfite) solution and individually packaged in a cardboard box.
|Country of Origin||Made in India|
Nanofiltration refers to a speciality membrane process which rejects particles in the approximate size range of 1 nanometer (10 Angstroms), hence the term "Nanofiltration." NF operates in the realm between UF and reverse osmosis. Organic molecules with molecular weights greater than 200-400 are rejected. Also, dissolved salts are rejected in the range of 20-98%. Salts which have monovalent anions (e.g. sodium chloride or calcium chloride) have rejections of 20-80%, whereas salts with divalent anions (e.g. magnesium sulfate) have higher rejections of 90-98%. Typical applications include removal of color and total organic carbon (TOC) from surface water, removal of hardness or radium from well water overall reduction of total dissolved solids (TDS), and the separation of organic from inorganic matter to specialty food and wastewater applications. Transmembrane pressures are typically 3.5 to 16 bar (50 to 225 PSI).
Nanofiltration (NF), in water treatment, “bridges” a gap between ultrafiltration and reverse osmosis membranes. It is sometimes referred to as a loose or lower rejecting RO membrane. It could also be called a tight UF, as NF membrane pore size ranges from .01 to a little less than .001. Generally, an NF membrane system lets more salt pass than an RO membrane. In addition, an NF membrane element will produce the same quantity of product at 50 to 70% the applied pressure as an RO water treatment system.
There are applications where a 75% rate of salt rejection is preferable to 95 to 99%, especially when it is achieved using only half of the energy. Unlike with RO membrane elements, the NF offerings of the major membrane manufacturers are quite different in performance from company to company. With RO membrane elements, any model with less than 99.5% sodium chloride rejection, especially with seawater membranes, is considered inferior. In the case of NF, there is a “place” for any membrane with a NaCl rejection rate of 40%, or more. Nanofiltration has also been called a “softening” membrane as while its salt rejection may be 80% or less, hardness rejection will often remain well over 90%.
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