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    3D printed anode electrodes for microbial electrolysis cells
    (Elsevier Sci Ltd, 2022) Bas, Furkan; Kaya, Mehmet Fatih
    Microbial electrolysis cells are used to produce high purity hydrogen from organic wastes. Electrodes are one of the most important components of microbial electrolysis cells because they may directly affect the system performance. Moreover, these electrodes are costly and may negatively affect electrolysis performance by giving chemical reactions with organic wastes. This study uses cheese whey wastewater as electrolyte, and a two chambered microbial electrolysis cell with novel different shaped 3D printed anode electrodes. To improve mass transfer inside the cell, 3D designed, and printed electrodes are used in different geometries (rod, 1-cycled spiral, 2-cycled spiral, 3-cycled spiral, and 4-cycled spiral) by using cupper-based Electrifi filament. Electrochemical performance of the electrodes is observed by cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy analysis. As a result, it is observed that the organic content of waste and electrode geometry directly affects the microbial electrolysis performance and hydrogen production. In the electrochemical analysis, 1-cycled spiral geometry has up to 2.6-fold higher current density in linear sweep voltammetry analysis. In addition, in the hydrogen production measurements, 1-cycled spiral geometry is 5-fold faster than other electrodes. It is observed that spiral shape of the electrodes improves the contact region between the electrode and electrolyte interface, and the charge transfer performance.
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    Investigation of the effects of magnetite addition on biohydrogen production from apple pulp waste
    (Elsevier Sci Ltd, 2023) Gokcek, Oznur Beguem; Bas, Furkan; Muratcobanoglu, Hamdi; Demirel, Sevgi
    Along with advancing technologies, the interest in producing renewable hydrogen by biological methods has recently increased due to its economic and eco-friendly properties. Various pretreatment methods or additives, such as enzymes and conductive materials, applied to increase the efficiency of biohydrogen production have been recently studied. In the current research, magnetite was utilized to increase the bioactivity of hydrogenproducing microorganisms during dark fermentation (DF). In the study, reactors with a S/I ratio of 2 gVS/gVS were set up, and magnetite was added at concentrations of 0, 50, 100, and 200 mg/L. The maximum biohydrogen production of 73.59 ml/gVS was obtained at 100 mg/L magnetite addition. Biohydrogen production increased by 46 % with 100 mg/L magnetite addition. In the magnetite-supported reactor, the dominant bacterial genera were Sporolactobacillus (39 %), Clostridium (15 %), and Coprothermobacter (10 %). It was thought that the change in microbial distribution positively affected biohydrogen production with the addition of magnetite.