| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method in intermittent sewage treatment which is capable of fixing the operation time of respective cycles and making stable operation. SOLUTION: In the intermittent sewage treatment of alternately repeating a process step of effecting a nitrification reaction by maintaining the interior of a water tank at an aerobic state by aeration and a process step of effecting a denitrification reaction by stopping the aeration and maintaining the interior of the water tank at an anaerobic state, the time (points of the time between a and d) Can when a DO value is actually above the threshold in each operation cycle and the aeration time An+1 (=An+k×ΔCn) of the next operation cycle by correcting the aeration time An of the cycle by a deviationΔCn between Can and target value Ctn are determined.
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