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Open AccessArticle Effect of Operating Parameters on the Performance Evaluation of Benthic Microbial Fuel Cells Using Sediments from the Bay of Campeche, Mexico
Sustainability 2018, 10(7), 2446; https://doi.org/10.3390/su10072446
Received: 20 April 2018 / Revised: 21 June 2018 / Accepted: 22 June 2018 / Published: 13 July 2018
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Abstract
Benthic microbial fuel cells (BMFC) are devices that remove organic matter (OM) and generate energy from sediments rich in organic nutrients. They are composed of electrodes with adequate different distances and floating air cathodes in an aqueous medium with saturated oxygen. In this
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    Benthic microbial fuel cells (BMFC) are devices that remove organic matter (OM) and generate energy from sediments rich in organic nutrients. They are composed of electrodes with adequate different distances and floating air cathodes in an aqueous medium with saturated oxygen. In this study we proposed to design, build, analyze and evaluate a set of BMFCs with floating air cathodes to test the optimal distance between the electrodes, using sediment from the Bay of Campeche as a substrate. For the analysis of OM removal, COD tests, volatile solids (VS), E4/E6 study and FTIR analysis were performed. Power generation was evaluated through polarization curves, cyclic voltammetry and electrochemical impedance spectroscopy (EIS). We achieved a current density and power density at 10 cm depth of 929.7 ± 9.5 mA/m2 and 109.6 ± 7.5 mW/m2 respectively, with 54% removal of OM from the sediment, obtaining formation of aliphatic structures. BMFCs are proposed as adequate systems for bioremediation and power generation. The system at 10 cm depth and 100 cm distance between sediment and the floating air cathode had a good performance and therefore the potential for possible scaling. Full article
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    Figure 1

    Figure 1
    <p>(<bold>a</bold>) SSM with electrodeposition; (<bold>b</bold>) SSME with AC-CB; (<bold>c</bold>) base for the electrode structure; (<bold>d</bold>) base on which the electrode is located; (<bold>e</bold>) lid that serves to press the electrode; (<bold>f</bold>) electrode seal; (<bold>g</bold>) Anode electrode; (<bold>h</bold>) structure of BMFC with assembled electrodes.</p>
    Full article ">Figure 2
    <p>BMFC diagram with different distances between floating air cathode and anode depths.</p>
    Full article ">Figure 3
    <p>FTIR of humic acids (HA) and fulvic acids (FA) (peak descriptors in the text).</p>
    Full article ">Figure 4
    <p>Polarization and power density curves at 10 cm (anode depth) and separation between the cathode and anode of 10 cm and 100 cm (North and Rain).</p>
    Full article ">Figure 5
    <p>Cyclic voltammetry obtained from the evaluation of the sediment at different sweeping speeds.</p>
    Full article ">Figure 6
    <p>Electrochemical impedance spectroscopy (<bold>a</bold>) BMFC during weather system from the North and (<bold>b</bold>) BMFC in Rainy season and equivalent circuit. DS: Distance, D. Depth.</p>
    Full article ">

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