Industrial Estate Wastewater Treatment Using Single Up-Flow Aerobic/Anoxic Sludge Bed (UAASB) Bioreactor: A Kinetic Evaluation Study

In this study, performance and kinetic analysis of carbon and nutrients removal in an up-flow aerobic/anoxic sludge bed (UAASB) bioreactor for the treatment of an industrial estate wastewater was investigated. The performance of the reactor was evaluated as a function of two variables, including hydraulic retention time (HRT) of 4, 8, and 12 h and aeration time of 40 and 60 min/h. To obtain the kinetic coefficients, mass balance, first-order, second-order, and Stover-Kincannon models were employed. From the mass balance model, growth yield (Y), microbial decay rate (K-d), were found to be 0.161 g volatile suspended solid (VSS)/g chemical oxygen demand (COD), 0.039 1/d, respectively, whereas for first-order model (K-1) was 4.56 1/d. The constant values for Stover-Kincannon model were obtained as half-velocity constant (K-B=9.82 g/L) and maximum total substrate removal rate constant (U-max=8.47 g/L d). (c) 2014 American Institute of Chemical Engineers Environ Prog, 33: 1220-1228, 2014