Investigation for biological nitrogen removal from wastewater using simultaneous nitrification/denitrification technology

Abstract

Biological nitrogen removal from the wastewater is based on the nitrification and denitrification processes at the biological treatment plant with the activated sludge. Different technological schemes can be used for the above mentioned processes. "BioBalance" technology as the newest way of nitrogen and phosphorus removal has been applied at Utena Wastewater Treatment Plant. "BioBalance Symbio" technology for the nitrogen removal is based on the active sludge technology with simultaneous nitrification/denitrification. The aeration zone and the anoxic zone are in one tank. The nitrification and denitrification are carried out during the aeration switching on and off. Nitrification and denitrification processes have been estimated during five experiments in the aeration tanks, when durations of aeration and low aeration were from 120 to 180 min. The impact of aeration regime on biological nitrogen removal has been estimated during this scientific work.