Nitrogen removal from opto-electronic wastewater using the simultaneous partial nitrification, anaerobic ammonium oxidation and denitrification (SNAD) process in sequencing batch reactor

► Opto-electronic wastewater with low C/N ratio was treated by SNAD process. ► Very high TN removal efficiency (∼93%) at NLR of 230 g/m3 d was achieved. ► The maximum % COD removal was found to be 79% by SNAD system. ► Dominant species of anammox bacteria were Candidatus Kuenenia stuttgartiensis.