Energy Saving and Nitrogen Removal by DO Control and Intermittent Aeration Using Extended Aeration System

장기폭기식 마을배수처리에서 간헐폭기 및 DO제어에 의한 질소제거 및 에너지 절약(지역환경 \circled3)

A laboratory scale extended aeration system was installed to study the effects of DO control and intermittent aeration on energy saving and nitrogen removal. The sensors of pH, DO, ORP, MLSS, and WT were installed in the aerator to monitor them and automatically control DO concentration as 2 mg/$\ell$. In the conditions showing nitrate knee on the ORP curves, nitrogen removal rates were kept over 91%. A 72.4 % of energy saving was achieved by intermittent aeration comparing with continuous aeration.