| 摘要 |
<p>PURPOSE:To obtain a clear discharged water in a filthy water treating apparatus by eliminating insufficiency in total aeration degree by increasing an extent of succeeding intermittent aeration, or by retarding excessive proliferation of microorganisms which proliferate under a relatively anaerobic condition by giving an implus of strong aerobic condition. CONSTITUTION:For example, a treating time of intermittent aeration is set at 6hr with a timer T1, and a settling time is set at 1hr with a timer T2. Further, a discharging time is set at 2hr with a discharging time judging timer T3. When the discharging time exceeds 2hr, a ratio of an aeration time to nonaeration time of a normal operation is changed from 1:1 to 2:1 (for a second intermittent aeration line). Thus, an extent of total aeration is kept in an appropriate range by increasing an extent of succeeding aeration when a degree of aeration is insufficient, or a strong impuls of aerobic condition is given to microorganisms group which propagate under anaerobic condition by increasing an extent of aeration remarkably temporarily. Thus, bulking phenomenon is prevented, and discharged water of good quality is obtd.</p> |
