Ultrafiltration (UF)

Pore size: 0,01-0,1 µm
illustration of ultra filtration
UF renders purified sea water and fresh water, virtually particle, bacteria and virus free.

Ultrafiltration (UF) purifies sea water and fresh water, removing suspended solids and most bacteria and viruses. UF-membranes have pore sizes from 0.01 µm to 0.1 µm, and are defined as UF-membranes, and components in the water are separated out based on size and shape. Pressure is the driving force for the separation. Ultrafiltration is operated at 1-2 bar.

No desalination takes place by ultrafiltration of sea water; The salinity will be the same both before and after filtration.
For fresh water, ultrafiltration can be combined with coagulation to remove natural organic matter (NOM). NOM is the component that gives water its colour, and humus is a large part of NOM.

Ultrafiltration can be used to achieve stable intake water quality for land-based plants in aquaculture. UF provides excellent conditions for UV treatment, which is recommended as a double barrier against pathogens.

Metals are often tied to NOM in fresh water. Removal of this fraction with UF in combination with coagulation will reduce the content of metal in the water and the risk of releasing toxic metals into fish farming plants.

Water quality ultrafiltered sea water

Salinity: 32 ‰ (unchanged)
Particles, parasites, bacteria and viruses: ≈ 0

Application areas:
Intake water for land-based aquaculture facilities

Water quality ultrafiltered fresh water

Particles, parasites, bacteria and viruses: ≈ 0
Colour: 5 (with coagulation)
TOC: 2 mg / l (with coagulation)
Reduced level of metals by coagulation

Application areas:
Intake water for land-based aquaculture facilities

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