Parametric Study on the Treatment of Paint Manufacturing Wastewater by Heterogeneous Fenton Process using Chemically-synthesized Schwertmannite as Catalyst

Author : Gallano, Jerico Valderama
Major Adviser : Capunitan, Jewel A.
Committee Members : Migo-Sumagang, Maria Victoria P.; Carpio, Rowena B.; Migo, Veronica P.
Year : 2019
Month : June
Type : Thesis
Degree: BS
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In this study, treatment of paint manufacturing wastewater was done through heterogeneous Fenton process using chemically-synthesized schwertmannite as catalyst. The catalyst was characterized using Scanning Electron Microscopy (SEM) and X-ray Fluorescence (XRF) analysis, obtained a chemical formula of Fe8O8(OH)5.22(SO4)1.39 which confirmed the catalyst as schwertmannite. The raw wastewater sample contained a chemical oxygen demand (COD) of 25,383 mg/L and color of 21,933 platinum-cobalt units (PCU). The effect of A, initial pH (2.5 and 4.5); B, schwertmannite dosage (5 and 10g/L); and C, hydrogen peroxide (H2O2) concentration (74 and 326 mM) on the percent decolorization was studied. Factors A, B, and C and interaction AB and BC were found to be significant. The percent decolorization increased with increase in pH and schwertmannite dosage but decreased with an increase in H2O2 concentration. Enhanced percent decolorization was observed for the interaction between pH and schwertmannite dosage interaction (AB) at pH 4.5 and schwertmannite dosage and H2O2 concentration interaction (BC) at 326 mM H2O2 concentration. The highest percent decolorization of 98.02 % was observed at a pH 4.5, schwertmannite dosage of 10 g/L and H2O2 concentration of 326mM with a final effluent COD of 59 mg/L and color of 300 PCU. Percent COD reduction was 94.19 %. The COD of the treated wastewater sample abide by the effluent standards based on DAO 2016-08 for a Class C water body.

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