Chemical Oxygen Demand (COD) reduction of wastewater from soybean tofu production was studied by conducting advanced oxidation process (AOP) using hydrogen peroxide with UV radiation catalysts in a closed cylindrical glass reactor. The hydroxyl radical ( OH) concentration from H2O decomposition was modeled and exponential trends were found for the OH concentration over radiation time and operation temperature. As a result it was found that the maximal OH concentration was 0.209 mol L-12 at 240 minutes and 50 deg C. The OH concentration exponentially increased following rise in operation temperature. The H2O /UV AOP application reduced COD concentration to approximately 42.41% from 10 545 to 6 073.2 mol L-12 at 240 minutes and 50 deg C. In addition the pseudo second order kinetics is a reliable model to present the COD reduction kinetics with the correlation coefficient R in the range of 95.9 to 99.4%. The kinetics constant increased with rise in operation temperature and it was approximately 2.30E-07 2.590E-07 and 3.03E-07 L mg-1 min-1 for 30 40 and 50 deg C respectively. The activation energy of COD reduction obtained was approximately 0.0138 J mol-1.