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In this study, the biological degradation of acid orange 7 (AO7) dye in textile wastewater was investigated using a consortium of novel bacterial strains isolated from Persian Gulf water and soil contaminated with petroleum compounds. In this experimental study, a pilot-scale-activated sludge bioreactor with a discontinuous flow was utilized. In this bioreactor, design parameters such as organic load rate (OLR), hydraulic retention time (HRT), and solids retention time (SRT) were considered to be 0.075–0.6 mg COD/L.day, 0.5–4 day, and 10.5–15.5 day, respectively. Bacterial species with the ability to degrade AO7 were identified using the 16S rRNA-PCR method. The results represented that the consortium of azo dye-degrading bacteria isolated from Persian Gulf water and soil contaminated with petroleum compounds in this study included Bacillus paramycoides strain M2, Pseudomonas putida strain M2a …