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In this study, the performance of Moving-Bed Biofilm Sequencing Batch Reactor (MBSBR) in operating the Anaerobic/Anoxic/Oxic (A 2 O) process for treatment of wastewaters containing nitrogen and phosphorous was evaluated. For this purpose, two bench scale SBR reactors with a total volume of 30 L and functional volume of 10 L were used. The pilot was made of Plexiglass, in which 60 percent of the functional volume consisted of PVC (Kaldnes K3 type) with a specific surface area of 560 m 2 /m 3. The independent variables used in this study were Hydraulic Retention Time (HRT) (1.5, 2, 2.5, 3, and 3.5 h) and organic load (300, 500, 800, 1000 mg/L). The results showed impressive performance in an organic load of 300 mg/L and HRT of 3h with maximum removal of COD and TN respectively by 95.12 and 89.8 percent and in an organic load of 1000 mg/L and HRT of 3.5h with maximum TP removal of 72.33 percent. Therefore, according to the analysis of data obtained by different HRTs, it was revealed that the system of A 2 O has the greater efficiency in the shortest possible time for removing organic matters from wastewater.

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