Table 7 Analysis of variance (ANOVA) obtained from average values of total phenols percentage reduction from L 9 orthogonal design to lignin residue treatment using photo-Fenton process
Factors | Square sum | Degree of freedom | Average square sum | F | p |
|---|---|---|---|---|---|
Temperature | 542.35 | 2 | 271.2 | 203.10 | 0.0000 |
pH | 127.92 | 2 | 64.0 | 47.90 | 0.0000 |
Fenton concentration | 584.42 | 2 | 292.2 | 218.80 | 0.0000 |
Residual | 1078.91 | 2 | 539.5 | 404.00 | 0.0000 |
UV | 12.02 | 9 | 1.30 | - | - |