Electrochemical Ion Exchange (EIX) was studied to determine the viability of the process for
treatment of metal bearing effluents containing Cu, Zn and Ni. Other metals used during the
investigation were Na and Cs. The EIX process was examined at the laboratory scale and
later in a pilot plant. Process performance and cell design were evaluated both in absorption
and regeneration cycles. A mathematical representation of the system was developed based
on the Nemst-Planck equation. Zirconium phosphate, Purolite S930 , Purolite S950 and
Purolite PrAOH were the ion exchangers used during the study.
The EIX cell was made of two perspex blocks, each 490 mm by 125 mm and 20 mm thick.
Each block contained a half cell made up of an EIX electrode and a counter electrode on
either side of a heterogeneous ion exchange membrane with dimensions of 280 mm by 63
mrn by 5 mm. The EIX electrode consisted of a platinised titanium mesh, acting as a current
feeder, embedded in the membrane. The counter electrode was a platinised titanium mesh
placed on the opposite side to the current feeder. The process was operated by applying a
potential across the membrane[continued]...
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.