| Resin: Synthetic organic ion exchange material, such as the
high capacity cation exchange resin widely used in water softeners.
Resins will selectively remove particular groups of metals from
solution. After preliminary recovery by precipitation, on the
one hand, or where plated metal objects have been given final
rinses, on the other hand, these metals are usually present
in waste solutions in concentrations of several parts per million.
Such concentrations, although low, can be environmentally harmful.
ItĦŻs widely used for water softening and removing calcium and
magnesium ions in water.
The common water softening methodology is ion exchange. The
hard water passes through a tank containing high capacity
ion exchange resin beads. The beads are saturated with sodium
to cover both their exterior and interior surfaces. As water
passes through the bed of softening materials, calcium and
magnesium ions attach to the resin beads while the sodium
on the resin is released into the water.
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