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Simultaneous Domestic Wastewater Treatment and Electricity Generation in Microbial Fuel Cell with Mn(IV) Oxide Addition
Author(s) -
Ni Jin,
SteinbergerWilckens Robert,
Wang Qunhui
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202004680
Subject(s) - tafel equation , microbial fuel cell , oxide , limiting current , current density , chemical oxygen demand , wastewater , chemistry , power density , anode , nuclear chemistry , materials science , analytical chemistry (journal) , electrode , electrochemistry , environmental engineering , environmental chemistry , organic chemistry , environmental science , physics , power (physics) , quantum mechanics
Abstract Compared to traditional domestic wastewater treatment methods, microbial fuel cells (MFCs) with Manganese(IV) (Mn(IV)) oxide addition were established to promote the degradation efficiency of organics in domestic wastewater and generate electricity simultaneously. Activated sludge consists of various electricigen and Mn(IV) oxide acts as an excellent electron acceptor. Results showed that the MFC with Mn(IV) oxide addition obtained higher total organic carbon and chemical oxygen demand removal efficiencies in domestic wastewater than without Mn(IV) oxide addition and in an open circuit system, and produced a maximum output power density of 0.946 W m −3 with a corresponding maximum voltage density of 0.915 V L −1 . Cyclic Voltammograms (CVs) indicated that the current density of the MFC with Mn(IV) oxide addition reached 2.21 mA cm −2 at the peak separation of 0.26 V, whereas the current density of the MFC only was up to 1.15 mA cm −2 at 0.443 V. Linear Sweep Voltammetry (LSV) showed the half‐wave potential and limiting current density of the MFC with Mn(IV) oxide addition as 71 mV and 4.24 mA cm 2 respectively, which were higher than corresponding values (36 mV and 3.65 mA cm −2 ) of the MFC. Tafel curves illustrated the MFC with Mn(IV) oxide addition showed a lower anodic Tafel slope of 6.14±0.393 V −1 , confirming the MFC with Mn(IV) oxide addition enabled faster electron‐transfer kinetics as compared to the MFC.