The introduction of oxygen into wastewater for nitrification requires a large amount of energy. Furthermore, the carbon source is often limited in wastewater, so purchasing of carbon source (typically methanol) is necessary too. A newly discovered anaerobic ammonium oxidation (Anammox) may circumvent the limitations and open up a new possibility for nitrogen removal from wastewater. The alternative approach is a microbiological involved activity, which requires less energy and enables more efficiency on N removal.
XING, Y. CLARK, I.D. (n.y): Anaerobic Ammonium Oxidation in Waste Water - An Isotope Hydrological Perspective. Ottawa: University of Ottawa URL [Accessed: 03.06.2019]