| UV light | Visible light | ||
| Time (min.) | COD (mg/l) | Time (min.) | COD (mg/l) |
| 0 | 1112 | 0 | 1112 |
| 15 | 940 | 15 | 897 |
| 30 | 725 | 30 | 658 |
| 60 | 563 | 60 | 482 |
| 90 | 530 | 90 | 133 |
| 120 | 472 | 120 | 9 |