abstract
Four ordinary carbon sources affecting V(V) reduction and bioelectricity generation in single chamber
microbial fuel cells (MFCs) were investigated. Acetate supported highest maximum power density of
589.1 mW/m2
, with highest V(V) removal efficiency of 77.6% during 12 h operation, compared with glucose,
citrate and soluble starch. Exorbitant initial V(V) concentration led to lower V(V) removal efficiencies
and power outputs. Extra addition of organics had little effect on the improvement of MFCs
performance. V(V) reduction and bioelectricity generation were enhanced and then suppressed by the
increase of conductivity. The larger the external resistance, the higher the V(V) removal efficiencies
and voltage outputs. High-throughput 16S rRNA gene pyrosequencing analysis implied the accumulation
of Enterobacter which had the capabilities of V(V) reduction, electrochemical activity and fermentation,
accompanied with other functional species as Pseudomonas, Spirochaeta, Sedimentibacter and
Dysgonomonas. This study steps forward to remediate V(V) contaminated environment based on MFC
technology.