Environmental Science And Technology - Research Publications

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Subject: search.filters.subject.Microbial electrolysis cell

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    Enhancing the electrochemical performance of Fe3O4 nanoparticles layered carbon electrodes in microbial electrolysis cell
    (Elsevier Ltd, 2021-09-10T00:00:00) Rani, Gini; Krishna, Kadirvelu; Yogalakshmi, K.N.
    The present study assesses the performance of microbial electrolysis cell (MEC) to generate electric current using (I) uncoated/untreated electrodes and (II) Fe3O4 nanoparticles (FNPs) coated electrodes. The cyclic voltammetry (CV) reports highest conductivity of 58 Sm?1 in (II) while lowest (0.18 Sm?1) in (I) electrodes. The impedance spectroscopy confirms bulk resistivity of 375 k? in (I) electrodes while relatively lowest resistivity of 0.4 k? in (II) electrodes. Two sets of single chamber membraneless MECs is operated simultaneously at different applied voltage (300 mV, 500 mV and 700 mV): RI (uncoated electrodes) and RII, (FNP coated electrodes). The RII attains maximum current density and power density of 15.2 mAcm?1 and 10.6 mWcm?2 respectively at 0.7 V while RI achieves the maximum current density and power density of 4.03 mAcm?2 and 2.8 mWcm?2 respectively at same voltage. Moreover, the current density recorded in electrodes (II) is significantly higher compared to electrodes (I) measured using CV. The result suggests FNP to be an excellent catalyst which improves biosynthesis of electric current. The biologically active environment consisting of anaerobic electrogenic microbes supported biosynthesis/generation of high electric current along with other metabolites produced from the microbes mediated redox reaction. � 2021 Elsevier Ltd
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    Batch fed single chambered microbial electrolysis cell for the treatment of landfill leachate
    (Elsevier Ltd, 2020) Rani G.; Nabi Z.; Rajesh Banu J.; Yogalakshmi K.N.
    A fed batch membraneless microbial electrolysis cell (MEC) was investigated for treating combined leachate and dairy wastewater at an applied voltage 0.8 V and hydraulic retention time (HRT) of 48 h. The COD (chemical oxygen demand) removal and energy recovery was tested by running several cycles of MEC with increasing ratios of leachate to dairy wastewater. With an increase in percentage of simulated leachate, MEC performance in terms of current generation, COD removal efficiency and hydrogen production showed a gradual decrease. A sudden drop in reactor performance was noticed when the concentration of leachate was increased from 14 to 16% corresponding to an increase in Organic Load Rate (OLR) from 23.89gCOD/m3/d to 24gCOD/m3/d. A continued operation of MEC at an OLR of 24gCOD/m3/d for ten continuous cycles resulted in COD removal efficiency of 73% and hydrogen production of 15 mL/L/d with current density of 10 A/m2 and a power density of 80 mW/cm2.