Parametric Study on the Decolorization of Sugar Factory Wastewater via Oxidation using Electrolyzed Water

Author : Rosal, Gjianne Vera L.
Major Adviser : Arocena, Rhebner E.
Committee Members : Gatdula, Kristel M.; Capunitan, Jewel A.
Year : 2021
Month : August
Type : Thesis
Degree: BS
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Sugar processing produces large quantities of wastewater which contains highly-colored and toxic substances harmful for aquatic bio system. The use of electrolyzed water, which contains free chlorine produced from electrochemical oxidation of sodium chloride (NaCl) solution, on the decolorization sugar factory wastewater was explored in this study. A full two-level factorial design was employed to determine the effects of three factors (wastewater to electrolyzed water volume ratio, reaction temperature, and electrolysis time) and their interactions on the decolorization of sugar factory wastewater. Statistical analysis found that all three factors and the two-factor interactions were all significant. The volume ratio exhibited an indirect relationship with decolorization while reaction temperature and electrolysis time had a direct relationship with the response. Initial characterization of the wastewater showed a temperature of 440 C, color of 1296 PCU and pH 8.5. After treatment, the best combination of factors was determined to be at 1:1 sugar factory wastewater to electrolyzed water volume ratio, 500 C reaction temperature, and 60 minutes electrolysis time which achieved a 65.28% ± 1.2 decolorization and a final pH of 8.2.

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