Parametric Study on the Decolorization of Aqueous Methylene Blue Solution using Electrolyzed Water

Author : Almendras, Genine Villanueva
Major Adviser : Arocena, Rhebner E.
Committee Members : Bataller, Butch G.; Guerrero, Gino Apollo M.
Year : 2021
Month : January
Type : Thesis
Degree: BS
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When not decolorized prior to disposal, wastewater containing dyes does not only affect aesthetics, but more importantly, endangers public health and aquatic ecosystems. In this study, the decolorization of dye wastewater, specifically aqueous methylene blue dye solution, using electrolyzed water was investigated. The electrolyzed waters used in the experiment were first characterized in terms of pH and free chlorine concentration (FCC). Then, the effects of NaCl concentration, electrolysis time, and feeding frequency on the degree and efficiency of decolorization were determined using a full two-level factorial design. All three factors have direct relationship on the degree of decolorization. On the other hand, both NaCl concentration and electrolysis time have indirect relationship with efficiency of decolorization, while feeding frequency has a direct relationship. All two-factor and three-factor interactions were also found to have significant effects on both responses. The highest degree of decolorization (66.305%) was observed at high level NaCl concentration, high level electrolysis time, and at high level feeding frequency, while the highest efficiency of decolorization (0.4726 mg MB decolorized/ mg FC) was observed at low level NaCl concentration, low level electrolysis time, and high level feeding frequency.

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