Vol 19, No 3 (2015) > Chemical Engineering >

Oxidation Process of H 2 O /UV for COD Reduction of Wastewater from Soybean Tofu Production

Komala Pontas 1 , Abrar Muslim 1


  1. Department of Chemical Engineering, Faculty of Engineering, Universitas Syiah Kuala Darussalam, Banda Aceh 23111, Indonesia


Abstract: 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 °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 °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 °C, respectively. The activation energy of COD reduction obtained was approximately 0.0138 J mol-1.
Keywords: COD reduction, hydroxyl radical, oxidation, radiation, kinetics, modeling
Published at: Vol 19, No 3 (2015) pages: 120-126

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