Nanofiltration is a  cross-flow filtration technology, which ranges somewhere between ultrafiltration and reverse osmosis with a nominal pore size of the membrane at  about 1 nanometre. This means that the transmembrane pressure drop is lower (up to 3 MPa) than the one used for reverse osmosis and reduces the operating cost significantly.

Nanofiltration is mainly applied in the process of purifying drinking water.

Other applications include the following:

  • Removal of organic matter and synthetic organic matter.
  • Food processing applications such as dairy
  • The removal of pesticides from groundwater
  • The removal of heavy metals from wastewater
  • Wastewater recycling in laundries
  • Water softening
  • Nitrates removal
  • De-colouring
  • Micro pollutant removal.
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