2.3. Operation of SBR
The SBR was operated in a 22-h cycle basis which consists of
four distinct modes: fill, react, settle, and decant. At the beginning
of each cycle,, a pre-defined feed volume was filled into the mixed
liquor remaining in the reactor from the previous cycle. During the
reaction phase, the reactor was aerated. After total reaction time of
20 h, the mixed liquor was allowed to settle for 2 h and the clarified
supernatant was discharged from the reactor. A sample of treated
effluent was collected for analysis. Subsequently, the reactor was
filled for next cycle of reaction without any downtime.