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Abstract
Nanofiltration is generally used to separate monovalent ions from divalent ions, but
it is also possible to separate ions of the same valency by careful application of
the transfer mechanisms involved. Analysis of the retention of halide salts reveals
that small ions like fluoride are the best retained, and that this is even more marked
under reduced pressure when selectivity is greatest. The selectivity desalination
of fluorinated brackish water is hence feasible and drinking water can be produced
directly at much lower cost than using reverse osmosis by optimizing the pressure
for the type of water treated.