| 摘要 |
<p>PURPOSE:To improve the quality of treated water by dividing an aeration tank into a plurality of regions in the downstream direction and thereby allowing environmental conditions of activated sludge to be adjusted. CONSTITUTION:A plurality of air diffusion pipe groups A, B, C, D which devide and eject air 8 in the downstream direction of a mixed liquid 10 are installed in an aeration tank 1. In each air diffusion pipe group, aeration amount adjustment means 38A, B, C, D which can be operated individually are provided. The aeration amount adjustment means 38D has a function to manipulate the aeration amount of the aeration tank 1 as a whole. The inflow sewage flow rate of the aeration tank 1 is continuously measured by a flow meter 11 and the measurements are output to an arithmetic and logic circuit 20. A daily inflow sewage amount is calculated by the arithmetic and logic circuit 20, and the calculated inflow sewage amount is compared with a reference inflow sewage amount which is output from a setting circuit 24, by an interpretation circuit 22, and an inflow difference is obtained. Furthermore, an imaging device 12 is installed in the aeration tank 1 and an enlarged image of the mixed liquid 10 is obtained. After this, the image is output to a recognition means 40 and thus the stable treatment of the sewage is ensured.</p> |
