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Table 1 The effects of different metal ions on the hydrogen production systems

From: Feasibility of biohydrogen production from industrial wastes using defined microbial co-culture

Metal ions (0.50 mol/L) H1 medium (mL/h -1 .L -1 ) H2 medium (mL/h -1 .L -1 ) Overall hydrogen production (%)
Controls 17.80 ± 1.51 15.90 ± 0.66 100.0
BaCl2 · 2H2O 3.74 ± 1.04 2.07 ± 0.36 17.21
CaCl2 6.23 ± 0.25 4.29 ± 1.03 31.16
CoCl2 · 6H2O 2.14 ± 0.99 1.113 ± 1.04 9.50
FeCl2 · 4H2O 21.54 ± 1.02 13.67 ± 0.76 104.45
FeCl3 · 4H2O 14.06 ± 1.09 18.44 ± 0.58 96.44
CuSO4 · 5H2O 14.77 ± 1.17 10.65 ± 1.97 75.37
KCl 18.69 ± 0.23 15.90 ± 1.54 102.67
MnSO4 · H2O 13.53 ± 0.76 10.02 ± 0.15 69.73
MgSO4 · 7H2O 21.18 ± 0.16 20.19 ± 0.83 122.85
NH4Cl 12.64 ± 1.88 10.81 ± 1.96 69.73
ZnSO4 · 7H2O 16.20 ± 1.09 12.08 ± 1.03 83.98
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