Conventional processes for ammonium removal are biological processes, like (de)nitrification and Annamox®. In both cases the ammonium is converted to nitrogen gas and all potential energy is lost. On top of that about 1-2% of ammonium will be discharged as N2O which is an unwanted strong greenhouse gas. Alternative treatment methods try to recover the ammonium as concentrated streams that can be reused, recovering the energy potential and preventing N2O emissions. But these alternative methods, like stripping, use a lot of energy.