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Electrodialysis reversal
Electrodialysis reversal
(
EDR
) is an
electrodialysis
reversal
water desalination
membrane
process that has been commercially used since the early 1960s. An
electric current
migrates dissolved
salt
ions
, including
fluorides
,
nitrates
and
sulfates
, through an electrodialysis stack consisting of alternating layers of
cationic
and
anionic
ion exchange
membranes. Periodically, the direction of ion flow is reversed by reversing the
polarity
of the applied electric current.
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