| 摘要 |
<p>PURPOSE:To accurately and stably control the accumulation quantity of sludge by calculating the total amount of activated sludge possessed by the whole of a process containing an aeration tank and a sedimentation basin, using a simulation result by a sludge total quantity operation means. CONSTITUTION:A sludge stagnation number-of-day operation part 20 calculates SRT from the total sludge holding amount Z calculated in a sludge total amount operation part 15, the total sludge holding amount Z calculated on the previous day and the excessive sludge withdrawing amount Zw on the previous day calculated in a withdrawing sludge amount operation part 16. The calculated sludge stagnation number of days SRT and the aformentioned sludge total amount Z are inputted to an inference operation part 21. In the inference operation part 21, the deviations with respective objective values are calculated with respect to the sludge total amount Z and the sludge stagnation number of days SRT. A fuzzy rule is set to the inference operation part 21 and the correction factor K calculated by fuzzy inference is supplied to an operation output part 22 which, in turn, multiplies the correction value of the previously calculated excessive sludge withdrawing flow rate by the correction factor K to output the calculated value to an excessive sludge withdrawing flow rate 12 as the operation output in the control cycle of the next time.</p> |
