| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 623553 | Desalination | 2014 | 8 Pages |
•We study the recovery of sulfuric acid from acid mine drainage by electrodialysis.•The effect of the applied current on the performance of an ED cell was investigated.•An effective recovery of sulfuric acid was obtained in the experimental conditions.•The main limitation of the process is due to the behavior of the cationic membrane.
In the present work the recovery of sulfuric acid from acid mine drainage by means of 3-compartment electrodialysis (ED) is evaluated. An effective recovery of sulfuric acid free from Fe(III) species was obtained in the anodic compartment as a result of the co-ion exclusion mechanism in the membranes. The difference in the pH and pSO42 − values between the membrane phase and the external electrolyte promotes the dissociation of complex species inside the membranes. This phenomenon impedes the transport of Fe(III) and sulfates in the form of complex ions toward the anodic and cathodic compartment, respectively. The current efficiency values of the anion-exchange membrane at different current densities were approximately constant with time. However, the increase in the recovery of acid decreases as the current increases. This result is explained by the shift in the equilibrium at the membrane/solution interface as more SO42 − ions cross the anionic membrane and, by the enhancement of the dissociation of water when the limiting current density is exceeded. The main limitation of the process is related to an abrupt increase in the cell voltage due to the formation of precipitates at the surface of the cation-exchange membrane.
