ABSTRACT
The main objective of this study was to evaluate Reactive Blue 19 dye removal efficiency in aerobic sequencing batch reactor [SBR] process by adding polyaluminum chloride [PAC1]. PAC1 was added to the reactors in concentrations of 0, 1, 5, 15 and 30 mg-Al/L [SBR[1] to SBR[5]] after filling periods. Initial dye concentrations were selected to be 40 mg/L for all reactors. The averages of dye removal efficiencies were more than 57% in all reactors. The maximum and minimum dye removal efficiencies were 71.7% +/- 13.6 and 57.7% +/- 34.3 in SBR3 and SBR4, respectively. According to the obtained results, PAC1 had not any significant effects on the COD removal efficiency. The MLSS and MLVSS concentration of SBRs had an increasing rate during whole operation time and reached from 2500 mg/L [1[st] day] to 4900 mg/L [39[th] day]. The maximum increasing rate was 50% in SBR[5]