ANAEROBIC-AEROBIC ACTIVATED SLUDGE TREATING DEVICE USING BUFFER TANK

摘要

PURPOSE:To provide the anaerobic-aerobic activated sludge treating device which removes the org. matter and nitrogen in waste water with high efficiency and takes the remedy for the load fluctuation arising from an increase in the inflow rate of the waste water into consideration as well. CONSTITUTION:The buffer tank 11 is provided in combination with an anaeration tank 2 and the waste water 9 is shunted to the buffer tank 11 and the anaeration tank 2 of the anaerobic-aerobic activated sludge treating device including a stage for denitrifying the waste water, such as sewage, by denitrifying bacteria in the anaeration tank 2, a stage for nitrifying ammonia nitrogen by nitrifying bacteria in an aeration tank 3, a stage for separating solid from the liquid in a final settling basin 4 and a stage for accelerating a denitrifying reaction by returning a part of the nitrifying liquid in the aeration tank 3 to the anaeration tank 2. On the other hand, an oxygen utilizing speedometer 18 and an oxygen utilizing speedometer 19 subtracting the oxygen utilizing speed by nitrification are installed in the aeration tank 3. A control means 14 which judges the progressing condition of the nitrification reaction of the aeration tank 3 by these two speedometers 18, 19 and determines the shunting ratio of the waste water to the buffer tank 11 and the anaeration tank 2 from the results of the judgment is provided.