Abstract

• The aim of this research work is to prepare biofilm for the treatment of three industrial wastewater samples from dry cell battery factory, nickel plating factory and leather factory in industrial zones I and II, Mandalay Region, Myanmar by using sequencing batch biofilm reactor. Totally four bacterial strains were isolated from three wastewater samples and identified. Isolated bacterial strains were recultured on sponges that were used as biofilm in this study. Decolourization activity of sequencing batch biofilm reactor was studied and found to be 54.29% (after 72 h treatment), 74.13 % and 53.32 % (after 64 h treatment) for wastewater samples from dry cell battery, nickel plating and leather factories wastewater samples, respectively. The order of removal of metal ions from three industrial wastewater samples by using sequencing batch biofilm reactor was Cr3+> Pb2+> Cd2+. Some physicochemical parameters such as pH, turbidity, total dissolved solids (TDS), dissolved oxygen (DO), chemical oxygen demand (COD) and biochemical oxygen demand (BOD) of industrial wastewater samples before and after treatment with sequencing batch biofilm reactor were also investigated.