Recently, modifying of Sequencing Batch Reactor (MSBR) treatment technology have been researched and improved widely to enhance and upgrade performance. This study on modified version of conventional SBR was Anoxic phase application in Sequencing Batch Biofilm Reactor (ASBBR). This system was applied for blackwater (BW) to remove a great part of pollutants especially, nutrient removal to achieve the consents and get the discharge standard. The study experiments were carried out through a laboratory-scale, which operated in three different modes for medium strength biochemical oxygen demand (COD) 300 mg/L and total suspended solids (TSS) 250 mg/L, as well as strong ammonia-(NH3-N) 70 mg/L, and total nitrogen (TN) 90 mg/L. The results revealed that the removal efficiencies of the system in the best mode of TSS, COD, NH3-N, and TN were 95%, 97%, 96% and 92%, respectively. When HRT was 36hrs for organic load 200, 50 and 60 g/m3. d for COD, NH3-N, and TN respectively. The effluent quality was meet discharge standards after comparison. WWTPs are facing to remove nutrients especially, nitrogen removal which is a major challenge. Also, it is the source of significant pollution problems in ground water for Erbil city. ASBBR was proposed to apply due to their advantages such as efficient in treatment, effective cost and flexibility in operation for various conditions.