Electrocoagulation was shown to be a versatile tool for decolorization
(up to 98% yield) of solutions containing Orange II, a highly
soluble dye, whereas the effectiveness of chemical coagulation with energy savings and decolorization yield could be found about
15 mA/cm2 with Al electrodes, while current density could be reduced
at 7.5 mA/cm2 with Fe electrodes for the same decolorization yield.
Finally, iron electrodes were shown to exhibit the highest decolorization
yield in a larger range of initial pH of wastewater and were able to
minimize simultaneously energy requirements, the amount of floc and
operation costs (≤0.25$/m3 water) in comparison to aluminium. Now,
further works should address a better understanding of EC mechanisms
in order to improve scale-up methodology