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This study determined the performance of upgraded sewage treatment plant (STP) based on an anaerobic-aerobic system consisting Up-flow Anaerobic Sludge Blanket (UASB) reactor, Final Polishing Unit (FPU) and Down-flow Hanging Sponge (DHS) system, treating municipal wastewater located at Dhandhupura, Agra, Uttar Pradesh (India). The performance evaluation of STP were based on the removal efficiency of parameters like Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS) and Volatile Suspended Solids (VSS). The results exhibits improved BOD, COD, TSS and VSS removal efficiency for UASB-DHS system (92.01%, 82.26%, 91.02%, 92.88%) as compared to UASB-FPU (81.67%, 74.35%, 83.72%, 83.41%) respectively. In addition, this study compares the UASB-DHS system with other post-treatment methods based on their treatment cost and …