| Time, minute | TiO2 concentration, g | COD, mg/l |
| 120 | 0.5 | 5760 |
| 180 | 0.5 | 4530 |
| 240 | 0.5 | 3800 |
| 300 | 0.5 | 3600 |
| 360 | 0.5 | 3200 |
| 360 | 0.5 (under UV lamp) | 3400 |