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- W26946906 abstract "Abstract Nanofiltration has been successfully applied to the recovery of spent anion exchange brines but not yet for spent cation exchange brines. Polymeric nanofiltration membranes have ionisable carboxyl and amine functional groups and tend to carry a negative surface charge at neutral pH, which actively rejects multivalent anions (such as colourants, phosphates and citrates). However, the amphoteric nature of polymeric nanofiltration membranes should permit the manipulation of surface charge by pH, to control the rejection characteristics of the membrane. Experiments on calcium rejection as a function of pH, brine concentration, calcium concentration and anion composition using commercially available nanofiltration membranes have shown that calcium rejection was highest at acidic pH, but was adversely affected by high brine concentration and elevated calcium concentrations due to charge shielding of the membrane. Diafiltration of the feed was explored to minimise these effects and maximise monovalent cation recovery. Developments of new membranes accentuating the amphoteric nature of polymeric nanofiltration membranes should permit the manipulation of surface charge by pH, to control the rejection characteristics of the membrane and enable development of further applications." @default.
- W26946906 created "2016-06-24" @default.
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- W26946906 date "2003-01-01" @default.
- W26946906 modified "2023-10-09" @default.
- W26946906 title "Nanofiltration for recovery of spent ion exchange brines" @default.
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