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Table 2 Three-level factorial experimental design with experimental and predicted values using different concentrations of H 2 SO 4 and treatment times a

From: Optimization of key factors affecting hydrogen production from sugarcane bagasse by a thermophilic anaerobic pure culture

Std

Typeb

Concentration (%)

Time (min)

Hydrogen (mL)

Code

X 1

Code

X 2

Experimental

Predicted

1

F

−1

0.2

-1

30

28.05

14.38

2

CE

0

2.1

-1

30

46.90

72.67

3

F

1

4.0

-1

30

60.95

48.85

4

CE

−1

0.2

0

90

66.45

82.98

5

C

0

2.1

0

90

141.05

135.15

6

CE

1

4.0

0

90

91.80

105.20

7

F

−1

0.2

1

150

86.05

83.18

8

CE

0

2.1

1

150

125.05

129.22

9

F

1

4.0

1

150

94.45

93.15

10

C

0

2.1

0

90

145.21

135.15

11

C

0

2.1

0

90

149.54

135.15

12

C

0

2.1

0

90

138.09

135.15

13

C

0

2.1

0

90

131.78

135.15

  1. aDesign part was derived from the software Design-Expert 8.0.
  2. bF = Factorial, CE = CentEdge, C = Center.