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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.