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
- Micro pollutant removal.