| 摘要 |
<p>PURPOSE:To stably obtain high quality treated water by measuring the weight of sludge staying in the final sedimentation basin of water treating equipment using activated sludge, the concn. of sludge drawn out of the basin and the concn. of SS in water to be treated to control the flow rate of sludge drawn. CONSTITUTION:In a model of the final sedimentation basin of water treating equipment using activated sludge, sludge settling velocity is expressed by an elastic modulus K as a function of sludge concn. and a stress relieving coefficient D, and sludge scraping speed is calculated. On the other hand, the concn. of sludge flowing into the basin is measured to obtain the settling velocity at the interface. Using these values the weight of sludge staying in the basin is obtd. and compared to a preset value. The concn. of SS in water to be treated is then measured and compared to a preset value. In accordance with the compared results the flow rate of sludge drawn out of the basin is is regulated. Thus, the function of the tank is fulfilled well, and high quality treated water can be obtd. stably.</p> |
