| Abstract |
| This study was performed to investigate an high densification and a decisive factor for aerobic granulation in sequencing batch reactor (SBR). Experiment was carried out under the reactor height/diameter (H/D) of 3.5-16.0. a cycle of 4 h (inlet 5min, aeration 210-225 min, settling 5-20 min and withdrawl 5 min), and recirculation ratio of 0.3-1.00. Influent characteristics was: COD 310-587 mg/L. T-N 20.0-39.6 mg/L. and T-P 3.1-15.3 mg/L. As a result, the decrease of settling time resulted in the decrease of MLSS concentration in the reactor. The removal efficiency of COD decreased a slightly with the increase of recirculation ratio, whereas the removal efficiencies of nutrient decreased significantly with the increase of recirculation ratio. The results of substrate reduction with height/diameter(HID) ratio of the reactor, recirculation ratio. and settling time showed that the removal efficiencies of COD. T-N and T-P ranged from 96.4 to 97.5%. 58.1 to 66.7%, and 43.0 to 58.6%. respectively. |
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| Key Words |
| SBR, Granulation, Settling times, height/diameter ratio, Recirculration ratio |
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