| 摘要 |
<p>PURPOSE:To contrive to properly control COD of waste water to be treated, by measuring the redox potential and dissolved oxygen amount in a tank and controlling the reaction in an aeration tank on the basis of the measured values. CONSTITUTION:Waste water to be subjected to aeration treatment such as waste water of a coke oven is introduced into two systems of first and second aeration tanks 1a, 1b from a waste water inlet 2 in a divided state and oxygen is supplied to activated sludge in the aeration tanks 1a, 1b by aerators to perform aeration treatment. The treated waste water is introduced into sedimentation tanks 5a, 5b to be separated into sludge and treated water. Redox potentiometers (ORP meters) 6 and dissolved oxygen densitometer (DO meters) 7 are arranged in the vicinity of the outlets of the aeration tanks 1a, 1b to measure ORP and DO. The operational condition of the aeration tank 1 is controlled on the basis of the measured values. By this method, stable operation is possible.</p> |
