Pilot scale deionisation of a galvanic nickel solution using a hybrid ion-exchange/electrodialysis system

San copolymer membranes with ion exchangers for Cu(II) removal from synthetic wastewater by electrodialysis

“…This method has already been applied for the removal of Cu 2+ , Ni 2+ and Cr 6+ ions from the dilute solutions (Dzyazko, 2006;Dzyazko et al, 2008;Spoor et al, 2002;Mahmoud et al, 2007;Feng et al, 2007). But in these cases the process is complicated by the deposition of insoluble compounds on the ion exchange membrane.…”

Treatment of simulated dilute Ni2+-containing wastewater by electrodeionisation with a bipolar membrane: Feasibility and current density distribution

“…Because of the advantages of the EDI process, the treatment of dilute heavy metal wastewater has also been studied by many scholars using different EDI configurations [14,[18][19][20][21][22][23][24][25][26][27][28][29][30], such as the traditional mixed-bed EDI (EDI-MB), EDI of only cationexchangers (EDI-CB), and the layer bed EDI (EDI-LB). All of the results have shown that the process could remove the heavy metal ions from the wastewater, but many problems exist.…”

“…For example, the traditional mixed-bed EDI [14,19] results in the precipitation of heavy metal hydroxides in the diluate compartment. The EDI filled with only cationexchangers [20][21][22][23][24][25] has a poor water product. The layer bed EDI [14] has a complex structure, and the process of filling with the resins is difficult; the separated bed EDI [22] causes difficulty in equipment amplification.…”

Treatment of a cyanide-free copper electroplating solution by electrodialysis: study of ion transport and evaluation of water and inputs recovery

“…Hybrid systems were developed to improve the efficiency of metal recovery by electrodialysis (120,121). There are several ways to hybridize two different techniques.…”

“…Therefore, a decrease in the electrical resistance and in energy consumption may be achieved. Different authors who evaluated electrodeionization for treating electroplating wastewaters were able to obtain percent extraction values higher than 97 % for the ions of interest (121,(123)(124)(125) Recently, a number of researches have been studying the feasibility of operating electrodialysis stacks in overlimiting regimes (92,(127)(128)(129). According to these authors, overlimiting regimes are suitable for electrodeionization systems when water splitting is enhanced, since the water splitting products may favor the regeneration of ion exchange resins.…”