Fig. 1. Total dissolved COD removal yields for flocculent (FSBR) and granular (GSBR)anaerobic/aerobic bioreactors operating in cycles with a reaction phase duration of5.5 and 5.0 h, respectively, during the treatment of a simulated textile wastewaterin the presence (FSBR1 and GSBR1) and in the absence (FSBR2 and GSBR2) of an azodye (AR14, 20 mg L−1at the start of the reaction phase).