Sea water treatment & desalination: is implemented when there is limited availability of well and surface water. This is particularly true in desert areas or when the available surface water is of extremely poor quality .
The technologies employed by NTESCO in the desalination of sea water are based on membrane processes. In particular the “heart” of the process scheme is a Reverse Osmosis unit where saline water is pumped in cross flow on the elements with enough pressure to overcome the high osmotic pressure and enable a satisfactory recovery factor.
Energy saving solutions are implemented with high-rejection energy saving permeators and with the use of “energy recovery” device enabling the energy of the high pressure concentrate to be transferred to the incoming feed water thus reducing the required power per unit of desalinated water.
Since sea water is a “living environment” with presence of micro-organisms and algae, key issues in the treatment of sea water are the filtration and debacterisation of the incoming water. The filtration could be performed again with membrane technologies (ultrafiltration, microfiltration) or with pressure-type media filters.
Another important factor in the design of a sea water desalination plant is the correct material selection because of the high sea water corrosivity.
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