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 3

Results obtained from the batch tests for each MFC with Fe²⁺ and Fe³⁺ inoculated with sludge and from the abiotic controls.

	Days	Sulfate (mg/L)	Sulfate reduction (%)	HS^-(mg/L)	Iron (Fe^2+/Fe^3+) (10 mM)	COD (mg/L)	COD removal (%)	pH	Voltage (V)
MFC with (inoculum) sludge and Fe^3+	0			0				4.5	0.184
	15				No Fe^2+ detected as a result of Fe^3+ reduction			7.4	0.360
MFC with (inoculum) sludge and Fe^2+	0							4.2	0.452
	15				The Fe^2+ was not detected in the anolyte of the MFC			7.4	0.647
MFC abiotic with Fe^3+	15	—	0	0	10 mM	—	0	4.5	0.158
MFC abiotic with Fe^2+	15	—	0	0	10 mM	—	0	4.5	0.120

The results presented correspond to the of duplicate samples. 10 mM (0.56 g/L).