Table 2 Experimental data for five levels of the two-factor response surface analysis
Run | A | B | I (klx) | C (mg/L) | Oil concentration (mg/L) | Biomass yield (mg/L·d) | ||
|---|---|---|---|---|---|---|---|---|
Actual | Predicted | Actual | Predicted | |||||
1 | 0 | − α | 4.00 | 4.83 | 60.00 | 56.52 | 45.00 | 43.37 |
2 | − 1 | − 1 | 2.00 | 15.50 | 49.00 | 52.42 | 30.00 | 31.68 |
3 | 0 | 0 | 4.00 | 41.25 | 107.80 | 105.76 | 98.00 | 96.40 |
4 | + 1 | + 1 | 6.00 | 67.00 | 143.00 | 140.08 | 163.00 | 161.82 |
5 | + 1 | − 1 | 6.00 | 15.50 | 78.00 | 79.65 | 85.00 | 85.77 |
6 | 0 | + α | 4.00 | 77.67 | 110.00 | 112.98 | 130.00 | 131.13 |
7 | 0 | 0 | 4.00 | 41.25 | 106.00 | 105.76 | 96.00 | 96.40 |
8 | 0 | 0 | 4.00 | 41.25 | 105.00 | 105.76 | 96.00 | 96.40 |
9 | 0 | 0 | 4.00 | 41.25 | 103.00 | 105.76 | 95.00 | 96.40 |
10 | − 1 | + 1 | 2.00 | 67.00 | 73.00 | 71.87 | 80.00 | 79.73 |
11 | − α | 0 | 1.17 | 41.25 | 55.00 | 53.50 | 45.00 | 44.10 |
12 | 0 | 0 | 4.00 | 41.25 | 107.00 | 105.76 | 97.00 | 96.40 |
13 | + α | 0 | 6.83 | 41.25 | 120.00 | 121.00 | 140.00 | 140.40 |