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Microbial fuel cells (MFCs) with Mn(IV) oxide addition showed improved domestic wastewater treatment and electricity generation compared to traditional methods.

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What they did

System
MFC

What worked

Power density946mW/m²
Current density0.02A/m²

Abstract

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.

Key findings

  • MFC with Mn(IV) oxide addition achieved higher total organic carbon and chemical oxygen demand removal efficiencies in domestic wastewater.
  • The MFC with Mn(IV) oxide addition produced a maximum output power density of 0.946 W m⁻³ and a corresponding maximum voltage density of 0.915 V L⁻¹.
  • 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.

Keywords

Tafel equationMicrobial fuel cellOxideLimiting currentCurrent densityChemical oxygen demand

Identifiers

DOI
10.1002/slct.202004680
Journal
ChemistrySelect
Year
2021