Abstract
Bioelectricity can be produced from wastewater using microbial fuel cells (MFCs) that produce electricity during electrochemical and biochemical reactions, yet actual applications of wastewater MFCs are limited; a self-provided microbial electricity enhanced wastewater treatment method is proposed producing microbial power and enhanced pollutants removal simultaneously. A carbon felt coated with amino-functionalized Fe3O4 particles was synthesized; power generation, removal of chemical oxygen demand (COD) and NH4+-N were evaluated with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), cell voltage and treatment efficiency. Results showed that the amino-Fe3O4 coated anode led to higher NH4+-N removal efficiency of 97.7 % than the Fe3O4 coated anode of 48.9 %. Moreover, the maximum power density of the amino-Fe3O4 anode is 208.67 mW/m2, 35.1 % higher than that of the Fe3O4 anode. This finding was explained by the presence of protonated amino groups NH4+ that favored the attachment of negatively charged bacteria. Amino-functionalization of the anode promotes a promising, novel technology to treat wastewater while producing electricity.
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