Multi response optimization of waste activated sludge oxidation and azo dye reduction in microbial fuel cell

Microbial fuel cell technology draws attention with its ability to directly recover electrical energy from various organic materials. In this study, the operating conditions affecting the oxidation-reduction and electricity generation efficiency of MFC were optimized using the Taguchi Experimental D...

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Bibliographic Details
Published in:Environmental technology 2024-06, Vol.45 (13), p.2599-2611
Main Authors: Durna Pişkin, Elif, Genç, Nevim
Format: Article
Language:English
Subjects:
Activated sludge
Activated sludge oxidation
Anaerobic conditions
Anaerobic treatment
azo dye removal
Azo dyes
Biochemical fuel cells
bioelectricity
Cathodes
Chemical oxygen demand
Color removal
Design of experiments
Design optimization
Efficiency
Electrochemical analysis
Electrochemistry
Electrode polarization
Electrodes
Electrons
Experimental design
Fuel cells
Fuel technology
Maximum power density
microbial fuel cells
Microorganisms
optimization
Organic materials
Oxidation
Pareto analysis
Substrates
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Summary:Microbial fuel cell technology draws attention with its ability to directly recover electrical energy from various organic materials. In this study, the operating conditions affecting the oxidation-reduction and electricity generation efficiency of MFC were optimized using the Taguchi Experimental Design model. Optimization was carried out for maximum power density, coulombic efficiency, azo dye removal, and COD removal. With the determined optimum conditions (cathode pH of 3.0, cathode oxygen status of anaerobic, anode substrate of pre-treated, external resistance of 100 Ω, cathode electrode type of plain carbon, cathode electrode surface of 22 cm 2 , cathode conductivity of 20 µs/cm), 177.03 mW/m 2 power density, 7.50% coulombic efficiency, 91.26% azo dye removal efficiency and 21.61% COD removal efficiency were obtained. By Pareto analysis, it was determined that the power density, coulombic efficiency and COD removal efficiency were most affected by the substrate type at the anode, and the azo dye removal was most affected by the catholyte pH. The maximum power density and internal resistance of the MFC operated under optimum conditions were determined as 145.11 mW/m 2 and 243.30 Ω, respectively by the polarization curve. Cyclic voltammetry was also performed for the electrochemical characterization of MFC operated under optimum conditions. An anodic peak at −183.2 mV and a cathodic peak at −181.2 mV was visible in the CV curve.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2023.2179422