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Nano Filtration  

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Atlantic Filter carries a wide range of nanofiltration systems to address different water treatment issues and requirements.

What is Nanofiltration?

Nanofiltration membranes have a pore size around 0.001 microns.

Nanofiltration (NF) is much the same as Reverse Osmosis. The key difference is the degree of removal of monovalent ions such as chlorides. Reverse Osmosis removes 98-99& of monovalent ions, whereas nanofiltration systems remove from 50-90%.
Nanofiltration (NF) is a membrane separation process in which water is forced through a semi-permeable membrane. NF removes most organic molecules, nearly all viruses, most of the natural organic matter and a range of salts. Nanofiltration removes multivalent ions from water. Divalent ions such as calcium & magnesium (limestone), which tend to make water hard, also are removed, so nanofiltration is often used to soften water instead of a traditional water softener.

Today, Nanofiltration membrane systems are used in many applications that require high purity soft water in residential & commercial applications, as well as in many food and pharmaceutical applications. NF systems are considered to be an excellent choice for whole-house treatment, commercial beverage & ice manufacturing, institutional ware washing and fountain beverage dispensing.  

How it Works

Nanofiltration is the process by which water molecules pass through a semi-permeable membrane . By applying an external pressure to the side of higher concentration, water is forced through the semi-permeable membrane which rejects most of the multivalent ions, but allows many of the monovalent ions to easily pass through to the other side.

The membrane is the workhorse of the NF system. It is responsible for rejecting up to 97 percent of the multivalent ions that make up the total dissolved solids (TDS) in the water. Different NF membrane configurations provide different rejection results (40-97%), so care must be taken to select the proper membrane for the specific application.
The NF membrane is only one stage of a typical Nanofiltration system. Sediment and carbon pre or post filtration are normally included with an NF system to help address additional contaminants. The effectiveness of an NF system depends on the initial levels of substances that cause water supplies to be unhealthy or unappealing (foul tastes, smells, color or hardness). NF also reduces many additional contaminants, which if left untreated can add to adverse health effects or decreased desirability.
What type of contaminants will nanofiltration remove?


Contaminant


Normal Rejection %


Contaminant


Normal Rejection %

Aluminum

96-98

Ammonium

80-90

Arsemoc

96-98

Borate

30-50

Bacteria

99+

Bromide

90-95

Boron

50-70

Calcium

93-98

Cadium

93-97

Chromate

85-95

Chloride

40-97

Cyanide

85-95

Copper

96-98

Ca, Mg (Hard.)

93-97

Fluoride

92-95

Lead

95-98

Iron

96-98

Magnesium

93-98

Manganese

96-98

Nickel

96-98

Mercury

94-97

Orthophosphate

96-98

Nitrate

90-95

Polyphosphate

96-98

Phosphate

95-98

Radioactivity

93-97

Potassium

93-97

Silicate

92-95

Silica

80-90

Sodium

40-97

Silver

93-96

Sulfate

96-98

Zinc

96-98

Thiosulfate

96-98