ملیحه امینی

The up-flow anoxic/aerobic sludge bioreactor (UAASB) was a unique system to study the kinetic of COD and ammonium-nitrogen removal. Four kinetic models including first-order, Grau second-order, Stover–Kincannon and Monod models were considered to evaluate the substrate removal. Stover–Kincannon model was found to be the best to describe the treatment process and fitted well with data sets. The removal of COD and ammonium-nitrogen with manipulating hydraulic retention time (HRT) were evalu- ated and results showed the optimum HRT of 0.64 days. Alteration trend of turbidity and sludge volume index (SVI) in various amounts of F/M showed the decrease of both factors in an effluent wastewater with F/M reduction. Moreover, the study of COD removal in batch scale system indicated the removal of 99.9, 94.83, 98.5 and 99.19% at influent COD of 1500, 2000, 3000 and 3500 mg/L, respectively.