This paper presents exploratory results of the performance of submerged areated bio-filter(SAB-1.5 L) for the post treatment of UASB effluent treating sewage in order to bring the effluent quallity in compliance with discharge standards. The study was carried out in three stages with varied dissolved oxygen (DO) levels of 0 to 2.0, 2.0 to 4.0, 4.0 to 6.0 and > 6.0 mg/L. The hydraulic retention time (HRT) and hydraulic loading rate (HLR) were maintained 0.67 h & 0.1 m3/m2h respectively in all stage of study. The performance in terms of BOD removal efficiency was increased with increase in DO levels. Results revealed that the average BOD and SS removal efficiences in phases 3 and 4 were 51.3 and 59.5;and 58.8 and 67.5;respectively. Significant ammonical nitrogen (NH4-N) removal of 60;was obseved in phase 4. The BOD and SS in phases 3 and 4 were reduced to well below the effluent disposal standards. The SAB at DO >=4 mg/L can be considered a viable alternative for the post treatment of effluent from UASB trating domestic wastewater.