Abstract
The transport of various anions from binary feed mixtures (where the common cation is Na +) was investigated. A bench-scale electrodialysis unit with 8 cell pairs in series was used to obtain results directly comparable to actual desalination operations. Experiments were carried out with three sets of available commercial permselective membranes and their characteristics are compared. Results are expressed by defining a Preference Factor, PF B A , and plotting this against current. Preferential transport of monovalent anions from 75% SO 4 2− feeds are shown to be in the order of I − > Br − > Cl − > HCO 3 − for all three membranes. A case of membrane poisoning with [Fe(CN) 6] 3− is reported.
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