The performances of AGS and flocculent anaerobic/aerobicSBR systems in the treatment of dye-laden textile wastewater were compared. Similar decolorization profiles with high yields(around 75–80%) were attained in both AGS and flocculent sys-tems. However, higher anaerobic and overall COD removal yields were observed in the AGS SBR. Additionally, the apparent inhibitory effect of the azo dye toward anaerobic COD removal detected in the flocculent SBR was not present in the AGS SBR.