Parametric Study on the Treatment of Sugar Refinery Spent Ion-Exchange Process (SIEP) Effluent by Heterogeneous Fenton Process using Iron (III) Oxide
Author : Sunga, Bea Rosas
Major Adviser : Capunitan, Jewel A.
Committee Members : Arocena, Rhebner E.; Migo, Veronica P.
Year : 2017
Month : December
Type : Thesis
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In this study, heterogeneous Fenton process using Fe₂O₃ catalyst was employed to treat sugar refinery spent ion-exchange process effluent. The effect of pH, Fe₂O₃ dosage, and H₂O₂ concentration were the factors considered. The significant effect and interactions between parameters were obtained using a two-level factorial design with two replicates and three center points. Results showed that the effect of the individual factors, H₂O₂ and pH, and their interaction were significant for the decolorization of spent ion-exchange process effluent. At increasing H₂O₂ concentration and pH, percent decolorization also increases. The highest percent decolorization achieved was 99.79% at pH 6, 5g/L Fe₂O₃ dosage, and 0.78M H₂O₂ concentration. This is mainly due to the removal of chromophore of melanoidin. On the other hand, for COD reduction, the significant factors observed were H₂O₂ concentration and pH, while the significant interaction was Fe₂O₃ dosage-H₂O₂ concentration and interaction of all three factors. The highest COD reduction achieved was 71.9 % at pH 3, 10g/L Fe₂O₃ dosage, and 0.78M H₂O₂ concentration. This is due to the formation of hydroxyl radicals that degrades organic contaminants. In addition, it was observed that the COD for samples with highest percent decolorization and COD reduction did not pass the DENR standards. Nevertheless, Fenton process can be considered as secondary treatment method for SIEP effluent.
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