2024 Volume 4 Pages 13-14
Recently, nitrogen cycling has become an issue, and electrodialysis as a membrane separation technique has been considered as a method to recover ammonium nitrogen (NH4+) from wastewater. In this study, we compared the concentration factor and recovery rate of NH4+ between standard membranes and monovalent selective membranes in multistage continuous flow electrodialysis using a model industrial wastewater containing three cations, NH4+, Na+, and Ca2+. By using the monovalent selective membranes, the concentration factor and the recovery rate were 10 and 96％, respectively, which values were higher than those obtained using the standard membranes. This was due to the fact that the monovalent selective membranes suppressed the transport of coexisting Ca2+ in wastewater.
