Theses and Dissertations

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Browsing Theses and Dissertations by Author "Anyanwu, John Ojinere"

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    Electrochemical and microbial treatment of bromophenol blue (BB) and malachite green (MG) dye contaminated water for electricity generation
    (Federal University of Technology, Owerri, 2023-09) Anyanwu, John Ojinere
    Pollutants present in textile waste water are recalcitrant and difficult to treat with simple processes. In this study, an energy-sustainable method for treating dye-contaminated water was devised by combining an electrochemical process and a microbial fuel cell. An electrochemical oxidation procedure using copper cathode and graphite anode electrodes was employed for decolorizing Malachite green (MG) and Bromophenol Blue (BB) dye in an aqueous solution. Bio-electricity was generated using BB and MG dye-contaminated water in a dual chamber MFC. Micro organisms isolated and cultured from MG and BB dye-contaminated soil were also employed to determine their efficiency in degrading dye-contaminated water. The isolated micro-organisms were identified as Eubacterium sp (M2), Streptobacillus sp (M3), Aspergillus niger (B6),Trichophyton terrestre (M4) Serratia marcescens (B2), Acinetobacter baumanni (B1), Bacillus subtilis (B3), Bacillus megaterium (B5), Aspergillus Flavus (B7), Rhizopus stolonifer (B8) respectively. Decolorizing ability of dyes was observed by dye decolorization assay. Streptobacillus sp achieved the highest degradation efficiency of 95.6 % for MG while Serratia marcescens achieved the highest degradation efficiency of 45.3% for BB. The impacts of a number of variables, including the supporting electrolyte, temperature, current density, and pH on the electrochemical dye removal process were investigated. While decolorization effectiveness exhibited a nonlinear pattern with pH and temperature, it increased gradually with current density and electrolyte content. With 100% maximum effectiveness, obtained at pH 3 for BB and 98.5% obtained at pH 5 for MG, while maximum efficiency of 98.3% was obtained at 380C for both MG and BB. The maximum OCV and power density achieved by MG based MFC is 0.7 2V and 8.33 mW/m2 while the maximum OCV and power density for BB based MFC is 1.28 V and 167.45 mW/m2. Density functional theory-based quantum chemical computations indicate oxidative attack to be initiated at the Bromine atom of the hydro-phenyl group for BB and at Carbon atom of the methylene group for MG.