TABLE 3.
Analysis of variance for the applied response surface model. TP, total phosphorus; TN, total nitrogen; A, total inorganic carbon (TIC); B, nitrogen-to-phosphorus ratio (N:P ratio); C, light intensity; R 2, determination coefficient; a.R 2, adjusted R 2; a.P., adequate precision; SD, standard deviation; CV, coefficient of variation.
| Responses | Modified Equations with Significant Terms | Probability | R 2 | a.R 2 | a.P | SD | CV (%) | Sum of Squares | Probability for Lack of Fit | |
|---|---|---|---|---|---|---|---|---|---|---|
| Pure error | Lack of fit | |||||||||
| TP removal (%) | 94.54–2.96A+ 3.56B+ 6.56C - 3.52BC - 3.67B2 | <0.01 | 0.83 | 0.74 | 11.5 | 3.67 | 3.96 | 23.00 | 98.28 | 0.52 |
| TN removal (%) | 45.78–1.15A-25.22B+ 10.93C–4.61AC + 9.89 A2 + 14.05B2 -3.92C2 | <0.01 | 0.98 | 0.96 | 22.9 | 4.55 | 8.06 | 21.03 | 123.89 | 0.32 |
| Productivity (g m−2 d−1) | 6.77 + 0.65A+ 0.3B+ 2.62C - 0.49B2 + 0.7C2 | <0.01 | 0.98 | 0.97 | 30.0 | 0.35 | 5.12 | 0.14 | 0.98 | 0.37 |
| P content (%) | 1.78 + 0.05A+ 0.02B- 0.11C - 0.26AB+ 0.07BC - 0.13A2 - 0.14B2 - 0.14C2 | 0.01 | 0.93 | 0.84 | 9.3 | 0.08 | 5.49 | 0.01 | 0.03 | 0.61 |
| N content (%) | 7.14–0.08A+ 0.58B- 0.51C + 0.61BC - 0.68B2 + 0.38C2 | <0.01 | 0.94 | 0.90 | 16.7 | 0.26 | 3.73 | 0.16 | 0.38 | 0.65 |
| Ash content (%) | 8.18–0.62A+ 0.05B- 1.14C - 0.31AB- 0.44AC | <0.01 | 0.93 | 0.89 | 15.9 | 0.35 | 4.28 | 0.14 | 0.96 | 0.38 |