FilmTec™ Nano Filtration Membrane

Nanofiltration (NF) is a membrane liquid-separation technology sharing many characteristics with reverse osmosis (RO). Unlike RO, which has high rejection of virtually all dissolved solutes, NF provides high rejection of multivalent ions, such as calcium, and low rejection of monovalent ions, such as chloride.

Nanofiltration refers to a specialty-membrane process that rejects dissolved solutes in the approximate size range of 1 nanometer (10 Angstroms) — hence the term “nanofiltration.”

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The ideal nanofiltration membrane has a very high water permeability, but the ideal permeability of solutes might be near zero or some higher value, depending on the solute and application. For example, an application may require near-zero permeability for pesticides and 50 percent permeability for calcium ions.

Typical applications of nanofiltration membrane systems include:

  • The removal of colour and total organic carbon (TOC) from surface water.
  • The removal of hardness or radium from well water.
  • The overall reduction of total dissolved solids (TDS).
  • The separation of organic from inorganic matter in specialty food* and wastewater applications

Source: Courtesy of DuPont™ Water Solutions

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