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Drinking Water  Arsenic Virtual Trade Show   Ion Exchange  Ion
exchange (IX) is a physical-chemical process in which ions are
swapped between a solution phase and solid resin phase. If
As(III) is present, it must be oxidized to As(V) in order for IX
to be effective.  The solid resin is typically an elastic three-
dimensional hydrocarbon network containing a large number of
ionizable groups electrostatically bound to the resin. These
groups are exchanged for ions of similar charge in solution that
have a stronger exchange affinity (i.e., selectivity) for the
resin.  In drinking water treatment, this technology is commonly
used for softening and nitrate removal. Arsenic removal is
accomplished by continuously passing water under pressure
through one or more columns packed with strong-base anion (SBA)
exchange resin. These resins are insensitive to pH in the range
6.5 to 9.0.  Interactive Schematic of an Ion Exchange System
Click image to view schem