Kinetics of Chemical Oxygen Demand (COD) Reduction of Distillery Slop using Calcium Peroxide as Oxidant Source for the Modified Fenton’s Process
Author : Abaoag, Myra Leora del Rosario
Major Adviser : Laurio, Michael Vincent O.
Committee Members : Alfafara, Catalino G.; Del Barrio, Marilyn C.
Year : 2016
Month : July
Type : Thesis
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The kinetics of COD reduction of distillery slops via modified Fenton’s treatment using calcium peroxide as oxidant was investigated in this study. Five samples with different initial COD concentrations of 36,100 mg/L, 45,200 mg/L, 78,000 mg/L, 80,400 mg/L and 98,000 mg/L were prepared and subjected correspondingly under optimum conditions: 3.17 g of CaO₂, 15.35 mL of FeSO₄, at a pH of 2.9 for the treatment of 15 mL of distillery slop with an initial COD concentration of 141,068 mg/L. Based from time profiles of temperature and residual COD concentration during the treatment, it was found that the initial COD concentration has a direct relationship with the peak temperature, an inverse relationship with average COD reduction and has no effect on the reaction time. Between the first-order, second-order, and BMG kinetic models, the BMG model best fit the kinetics of the modified Fenton’s process with a combined regression coefficient of 0.9526. By linear regression, the kinetic parameters showed an initial rate of 0.02193 sec⁻¹ with a predicted percent COD reduction of 77.65 %. Lastly, preliminary continuous stirred tank reactor design calculation using the results of the kinetics study resulted to a space time of 1.134 hours and reactor volume of 2449.44 m³. This design was computed under the operating conditions of 90 m³ /day volumetric flow rate of incoming slops with an initial COD concentration of 115,747 mg/L, 300 sec of reaction time and 77.65 % efficiency.
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