Table 2.
The parameters obtained by fitting the pseudo-first-order COD and Chl-a kinetics with experimental data. Ko: pseudo first order decay constant (h−1); (tm)COD: time required to the concentration of COD decay to half initial values (h); (tm)Chl-a: time required for the concentration of Chl-a to decay to half its initial value (h). Different letters in each column indicate significant differences.
| Chemical oxygen demand (COD) Decay | ||||||
| H2O2 addition | With light | Without light | ||||
| (Ko)COD (h)−1 | R2 | (tm)COD (h) | (Ko)COD (h)−1 | R 2 | (tm)COD (h) | |
| 0 | 7.5 × 10−4 ± 5.1 × 10−4 | 0.55 | 925 ± 629 a | 6.5 × 10−4 ± 1.2 × 10−4 | 0.86 | 1050 ± 194 a |
| 0.17 mg·L−1 | 4.9 × 10−3 ± 1.5 × 10−3 | 0.70 | 142 ± 43 b | 9.5 × 10−4 ± 3.8 × 10−4 | 0.55 | 728 ± 291 a |
| 0.33 mg·L−1 | 5.4 × 10−3 ± 1.0 × 10−3 | 0.56 | 128 ± 24 b | 1.3 × 10−3 ± 6.3 × 10−4 | 0.45 | 533 ± 258 a |
| 0.83 mg·L−1 | 4.3 × 10−3 ± 9.5 × 10−4 | 0.87 | 163 ± 36 b | 1.5 × 10−3 ± 1.5 × 10−4 | 0.44 | 459 ± 46 b |
| 1.67 mg·L−1 | 7.8 × 10−3 ± 4.9 × 10−3 | 0.70 | 88 ± 55 b | 2.6 × 10−3 ± 7.5 × 10−4 | 0.34 | 277 ± 80 b |
| 3.33 mg·L−1 | 1.9 × 10−2 ± 9.9 × 10−3 | 0.85 | 36 ± 18 b | 5.6 × 10−3 ± 2.5 × 10−3 | 0.50 | 126 ± 56c c |
| Chlorophyll-a (Chl-a) Decay | ||||||
| H2O2 addition | With light | Without light | ||||
| (Ko)Chl-a (h)−1 | R 2 | (tm)Chl-a (h) | (Ko)Chl-a (h)−1 | R 2 | (tm)Chl-a (h) | |
| 0 | 0.010 ± 0.002 | 0.84 | 69 ± 13.8 a | 0.011 ± 0.002 | 0.86 | 63 ± 11.4 a |
| 1.67 mg·L−1 | 0.057 ± 0.008 | 0.89 | 12 ± 1.7 b | 0.050 ± 0.009 | 0.79 | 14 ± 2.5 b |
| 0.17 mg·L−1 | 0.042 ± 0.008 | 0.86 | 16 ± 3.1 b | 0.025 ± 0.008 | 0.86 | 28 ± 8.8 b |
| 0.33 mg·L−1 | 0.050 ± 0.009 | 0.83 | 14 ± 2.5 b | 0.041 ± 0.008 | 0.87 | 17 ± 3.3 b |
| 0.83 mg·L−1 | 0.050 ± 0.008 | 0.87 | 14 ± 2.2 b | 0.045 ± 0.008 | 0.85 | 15 ± 2.6 b |
| 3.33 mg·L−1 | 0.060 ± 0.009 | 0.85 | 12 ± 1.8 b | 0.051 ± 0.008 | 0.79 | 14 ± 2.1 b |
Note: a, b, c, indicate significant differences between treatments at the 5% level of probability (p < 0.05).