| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for determining the operation condition of an oxidation ditch capable of efficiently determining the operation condition such as the depth of immersion of an impeller, the number of rotation or the like. <P>SOLUTION: The method for determining the operation condition of the oxidation ditch 1 includes a circulation water path 8 having an endless edge, and the impeller 3 for agitating and aerating a mixture liquid 2 of waste water and activated sludge flowed in the circulation water path 8. In this method, if a flow rate of the mixture liquid 2 denotes V, the depth of immersion of the impeller 3 denotes X, power introduction density denotes Y and a sludge concentration (MLSS) denotes Z, the depth of immersion of the impeller 3 and the power introduction density are determined from the flow rate of the mixture liquid 2 and the sludge concentration based on a relational expression given by V=a×X+b×Y+c×Z+d (wherein a, b, c and d are a predetermined constant). <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
