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Simpec - Reverse Osmosis and Nanofiltration Plants
Reverse osmosis plants use the membrane selectivity to obtain the water demineralization. This process doesn’t consist only of a physical obstacle (produced by the membrane pores dimensions) to the passage of the molecules, but it use the different chemical affinity of the solutions with the membrane, permitting the hydrophile molecules (or water-like) passage.
Nanofiltration plants are usually used for softening. Nanofiltration plants differ from reverse osmosis plants for the type of membrane installed. The nanofiltartion membrane has bigger pores and it doesn’t stop all the salts but only the molecules with bigger dimensions. The nanofiltration is mostly use to remove organic solutions (colored substances, nitrates, etc.) and multivalent ions.
Reverse osmosis and nanofiltration plants work at high pressures.