Biosorption of Hexavalent Chromium from Simulated and Actual Chromium-containing Wasterwater by Kappaphycus spp. Doty Biomass

Author : Rodriguez, Raymund Claudio
Major Adviser : Capunitan, Jewel A. 
Committee Members : Alfafara, Catalino G.; Borines, Myra G.; Migo, Veronica P.
Year : 2017
Month : June
Type : Thesis
Degree: BS
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The biosorption of hazardous hexavalent chromium, Cr (VI) from simulated and actual wastewater was studied using Kappaphycus spp. Doty. The equilibrium contact time was determined to be 120 minutes. Batch experiment using 2³ factorial design was conducted to determine the effect of mass loading, initial pH of the Cr (VI) solution, and initial Cr (VI) concentration on the % Cr (VI) removal from the simulated wastewater. The three factors and their interactions were found to be significant by ANOVA. The highest % removal of Cr (VI) from the simulated wastewater was 66.2 %, obtained at mass loading of 2.0 g/L, initial pH of 1.0 and initial Cr (VI) concentration of 10 mg/L. The experimental data best fitted the Freundlich isotherm with a liner regression coefficient of 0.954. The best conditions of the factors were used in testing the biosorption of actual Cr (VI) wastewater using Kappaphycus spp. Doty biomass and the % Cr (VI) removal was 51.7 %, which is lower by 21.85 % than when simulated wastewater was used, which may be due to the presence of interfering components in the actual Cr (VI) wastewater. The Langmuir isotherm was found to best fit the experimental data for the actual Cr (VI) wastewater with linear regression coefficient of 0.994. The maximum sorption capacity (Qₘ) for the simulated Cr (VI) wastewater was 9.77 mg Cr (VI) /g Kappaphycus spp. Doty and 4.95 mg/g for the actual Cr (VI) wastewater.

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