Influence of Fe²⁺ and Fe³⁺ on the Performance and Microbial Community Composition of a MFC Inoculated with Sulfate-Reducing Sludge and Acetate as Electron Donor

Table 1

Experimental conditions for the batch tests for each MFC.

Parameter	MFC with sludge and Fe^2+	MFC with sludge and Fe^3+	MFC abiotic with Fe^2+	MFC abiotic with Fe^3+
Mineral medium	Yes	Yes	No	No
Volume	125 mL	125 mL	125 mL	125 mL
Sulfate (SO4^-2)	6000 mg/L	6000 mg/L	6000 mg/L	6000 mg/L
Acetate	4000 mg/L	4000 mg/L	4000 mg/L	4000 mg/L
Iron concentration	Fe^2+10 mM	Fe^3+10 mM	Fe^2+10 mM	Fe^3+10 mM
Temperature (°C)	25	25	25	25
Time	15 days	15 days	15 days	15 days
Inoculum 15%	0.0097 g VSS/g inoculum	0.0088 g VSS/g inoculum	No	No
Graphite cloth area: 16 cm^2	With biofilm	With biofilm	No biofilm	No biofilm

10 mM (0.56 g/L).