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Decolorization of Distillery Slop by Heterogeneous Fenton Process using Synthetic Schwertmannite as Catalyst

Author : Alcantara, Kristian Jay Rabara
Major Adviser : Capunitan, Jewel A.
Committee Members : Nisola, Vic Jayson M.; Carpio, Rowena B. 
Year : 2019
Month : July
Type : Thesis
Degree: BS
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Abstract

Distillery slop wastewater was treated by heterogeneous Fenton process using Schwertmannite as catalyst. Schwertmannite was synthesized using fast chemical oxidation and had cotton-like morphology, with a weak crystalline structure and diffraction peaks (27.28°, 35.24°, 39.92°, 46.36°, 54.46°, 61.88° and 63.08°) similar to PDF 47-1775. The synthesis yield was achieved at 43.66%. The distillery slop had a dark-brown color, with pH 4.6, high color and high COD level, thus heterogeneous Fenton process was employed. The effect of initial pH, hydrogen peroxide (H₂O₂) concentration, and Schwertmannite dosage on the decolorization of wastewater were assessed using two-level factorial design with two replicates and four center points. ANOVA results showed that all individual factors as well as the interaction between Schwertmannite dosage and H₂O₂ concentration were significant contributors to improve percent decolorization. Highest percent decolorization (68.52 %) was achieved at pH 3, 0.39 M H₂O₂ and 10 g/L Schwertmannite, which was further analyzed for final color and COD level. Findings observed 71,000 PCU color of and 77,400 mg/L COD level, still not compliant with the DAO standards. The Schwertmannite-catalyzed heterogeneous Fenton process can be used as tertiary treatment after the wastewater has undergone considerable biological treatment processes.

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