Removal of iron-cyanide complexes using
ultrafiltration (MEUF)-based separation of iron-cyanide complexes, ferriccyanide and
ferrocyanide, was investigated in order to assess the potential of MEUF for the removal of
ferriccyanide and ferrocyanide with a cationic surfactant, cetylpyridinium chloride (CPC).
The removals of ferriccyanide and ferrocyanide were >99% and 99%, respectively, with
the molar ratio of CPC to ferriccyanide/ferrocyanide of 3 and 4, respectively. Both the
rejection and the concentration of CPC in the permeate were low enough to meet effluent
standard. The MEUF process can be a good alternative to reverse osmosis or ion exchange
for removal of iron-cyanide complexes.