Parametric Study on the Treatment of Pulp Wastewater by Heterogeneous Fenton Process Using Chemically-Synthesized Schwertmannite as Catalyst
Author : Castillo, Jerric John Alamazan
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
Pulp wastewater (pH = 12.9, COD = 18,509 mg/L, color = 47,607 PCU) was diluted ten times and treated by heterogeneous Fenton process using chemically-synthesized schwertmmanite to determine the effects of three parameters: initial pH (2.5 and 4.5), schwertmannite dosage (5 g/L and 10 g/L), H2O2 concentration (74 mM and 326 mM), and their interactions on the percent decolorization of the wastewater. A 2k factorial design with two replicates and four center points was implemented. Results showed that all factors were significant including the interaction of the initial pH and schwertmannite dosage. Increasing the pH to 4.5 resulted in an increased on percent decolorization since it prevented the scavenging of •OH by H+ and the formation of iron complexes which inhibits the % decolorization of the wastewater. At low pH of 2.5, increasing the schwertmannite dosage resulted in an increased on percent decolorization due to the increasing number of active sites and available Fe3+/Fe2+ to form •OH. At high pH of 4.5, there was no significant difference on the % decolorization using 10 g/L and 5 g/L of schwertmannite due to lower utilization of Fe3+. Increasing the H2O2 concentration resulted to a higher percent decolorization since it promoted additional source of •OH. Overall, the chemical cost of the treatment was 848.57 Php/L based from 98.10 % decolorization and 67.28 % COD reduction obtained after 16 hours using 5 g/L schwertmannite, 326 mM H2O2 concentration and pH = 4.5, indicating the effectiveness of the heterogeneous Fenton on pulp wastewater treatment.
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