• up-flow aerobic/anoxic sludge bed bioreactor;
  • industrial wastewater;
  • kinetic evaluation

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 (Kd), 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 (K1) was 4.56 1/d. The constant values for Stover-Kincannon model were obtained as half-velocity constant (KB = 9.82 g/L) and maximum total substrate removal rate constant (Umax = 8.47 g/L d). © 2014 American Institute of Chemical Engineers Environ Prog, 33: 1220–1228, 2014