| 摘要 |
PURPOSE:To grasp a waste water treatment state quantitatively, continuously and accurately, by providing dissolved oxygen sensors to a point spaced apart by 2/3 from the inlet of an aeration tank and a point in the vicinity of the outlet of said tank one at a place and comparing dissolved oxygen amounts in waste water measured by both sensors. CONSTITUTION:Raw water with BOD of 100ppm issued from a first precipitation tank 1 is injected into each of aeration tanks 2 in a flow amount per one tank of 500m<3>/hr. Return sludge (MLSS concn. of 10,000ppm) from a final precipitation tank 3 is injected into raw water in an amount of 300m<3>/hr directly before the aeration tanks 2. An air diffusion pipe 6 from a blower 5 is provided to the tank bottom of each aeration tank 2 and 120m<3>/hr per one tank of air is uniformly blown into each tank and perfect mixing is performed in the tank to uniformize MLSS concn. and raw water is aerated by an equal amount of air in a range from the inlet A of the aeration tank 2 to a point in the vicinity of the outlet C thereof. Further, a DO meter 8 for detecting a dissolved oxygen amount is provided to a point B where oxidative decomposition is completed and a separate DO meter 9 is provided directly before the outlet C.
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