Alternate switching between MFC and MEC for H2O2 synthesis and residual removal in Bioelectro-Fenton system

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    Abstract

    Sustainable H2O2 supply and elimination of residual H2O2 are two key challenges to the Fenton processes treating recalcitrant contaminants. In this study, an innovative Bioelectro-Fenton system capable of alternate switching between microbial electrolysis cell (MEC) and microbial fuel cell (MFC) mode of operation was developed to meet the challenges. In the MEC mode, H2O2 was electrochemically produced which reacts with Fenton’s reagent (Fe II) to form hydroxyradical. The residual H2O2 (unused H2O2) is removed as electron acceptor by switching the system to MFC mode. Complete decolorization and mineralization of 50 mg L-1 methylene blue (MB) was achieved in the MEC mode with apparent first order rate constants of 0.43 and 0.22 h-1, respectively. After switching to the MFC mode, residual H2O2 of 180 mg L-1 was removed at a removal rate of 4.61 mg L-1 h-1 while generating a maximum current density of 0.49 A m-2. The MB degradation and residual H2O2 removal were affected by external resistance, cathode pH and initial MB concentration. Furthermore, the system performance was enhanced under stack operation. This study provides a proof-in-concept new system for efficient and cost-effective H2O2 control and recalcitrant pollutants removal.
    Original languageEnglish
    Title of host publicationBook of abstracts : The 3rd european meeting of the international society for microbial electrochemistry and technology (EU-ISMET 2016)
    EditorsFederico Aulenta, Mauro Majone
    Place of PublicationRome, Italy
    Publication date2016
    Pages91-91
    Publication statusPublished - 2016
    Event3rd European Meeting of the International Society for Microbial Electrochemistry and Technology - University of Rome, Rome, Italy
    Duration: 26 Sept 201628 Sept 2016
    Conference number: 3
    https://www.sciencetheearth.com/uploads/2/4/6/5/24658156/programma_eu_ismet_final.pdf

    Conference

    Conference3rd European Meeting of the International Society for Microbial Electrochemistry and Technology
    Number3
    LocationUniversity of Rome
    Country/TerritoryItaly
    CityRome
    Period26/09/201628/09/2016
    Internet address

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