title: Submerged aerated bio-filter (SAB)--a post treatment option for UASB effluent treating sewage.
abstract: This paper presents exploratory results of the performance of submerged aerated bio-filter (SAB-1.5 L) for the post treatment of UASB effluent treating sewage in order to bring the effluent quality 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/ m2 x h 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 efficiencies 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 observed 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 treating domestic wastewater.
authors.forename: Padigala
authors.initials: P
authors.lastname: Sudhir
authors.forename: Rubia Zahid
authors.initials: RZ
authors.lastname: Gaur
authors.forename: Abid Ali
authors.initials: AA
authors.lastname: Khan
authors.forename: A A
authors.initials: AA
authors.lastname: Kazmi
authors.forename: Indu
authors.initials: I
authors.lastname: Mehrotra
mesh_terms: D019149:Bioreactors; D005243:Feces / Q000382:microbiology; D005374:Filtration / Q000295:instrumentation*; D009584:Nitrogen / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage; D009584:Nitrogen; D010100:Oxygen