Abstract:A laboratory-scale biogas-lift anaerobic reactor (BLR) with anaerobic granular sludge was fed with low-strength wastewater (brewery wastewater, in this study). The operation temperature was at (35±1)℃and influent COD concentration was from 210o 2400mg/L. OLR was increased and HRT was decreased by gradually increasing the influent flow rate. First-order model, Monod and Contois model, Grau second-order model, and Modified Stover-Kincannon kinetic model were used to study variation of Se under different HRT and Si. Experimental results showed that First-order and Monod and Contois models were not applicable to this experiment, whereas both Grau second-order model and Modified Stover-Kincannon model generated acceptable results. Model evaluation was then carried out via assessing the linearity between the experimental data and the calculated values with the formulas of the latter two models. The deviation values showed that the calculation of Grau second-order model was closer to the experimental values than Modified Stover-Kincannon model.