Table 1. Yield and productivity obtained at different initial pH and substrate concentrations, during the acidogenic fermentation assays.

Yield
[mol H₂/mol of
glucose]

Maximum specific
productivity
[mmol H₂/ gVSS∙h]

pH

[g COD/L]

Average

Standard
deviation

Average

Standard
deviation

Glucose
removal (%)

5.5

3

0.87

0.02

2.90

0.96

97.3

5

0.82

0.03

3.35

1.22

97.0

10

0.76

0.03

3.27

1.03

91.0

6.5

3

1.07

0.04

5.01

0.72

100

5

0.93

0.04

5.18

0.35

98.8

10

0.72

0.05

4.64

0.78

98.5

7.5

3

0.70

0.04

2.02

0.52

100

5

0.88

0.01

3.27

0.03

100

10

0.78

0.06

6.06

0.62

99.4