| 摘要 |
<p>PURPOSE:To maintain the condition for decontamination of sewage always in an optimum condition by calculating control indices such as BOD-SS load or the like in plural sewage treatment systems provided with aeration tanks and calculating the target value of the control indices over the entire part of the systems. CONSTITUTION:Control indices such as actual BOD-SS load, number of days of sludge, days of stagnation of sludge, total holding capacity of sludge, etc. of the respective series are calculated with the 1st calculator from the actually measured values of the inflow rate of sewage, the concn. of SS, the flow rate of return sludge, etc. in a sewage treatment plant consisting of multiple systems of aeration tanks and settling basins. The target values of the control indices as the entire part of the systems are calculated with the 2nd calculator in accordance with the index for sludge capacity, the coefft. of the speed of utilization of oxygen, etc. and the target values of the control indices for each of the systems are calculated with the 3rd calculator from the target values of the control indices for the entire system. The distribution rates of the sewage to the respective systems are calculated with the 4th calculator from the results of the calculations with the 1st calculator and the 3rd calculator.</p> |
