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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Abstract

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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