Abstract
An experimental study of aeration control was conducted by dissolved oxygen (DO) as a parameter in a Sequencing Batch Reactor (SBR). Experiments were performed by changing the rate of aeration and concentrations of MLSS and COD within the range of the experimental conditions, and subsequently investigated the degradation rate of substrate and the variation of DO concentration.
It was revealed that there are two range of aeration time which the DO level indicates a certain value (balanced DO concentration) and great rise respectively, and DO level rose quickly in large range from the so-called “balanced DO concentration” just after degradation of the substrate in the reactor was completed. Consequently this indicates that DO can be reliably used as the indicative control parameter of reaction time. On the other hand, the “balanced DO concentration” varied with changes of aeration rate and initial concentrations of MLSS and COD. Therefore it might be possible to properly control the SBR process by watching the “balanced DO concentration ” with the measurement of DO concentration.
