| Factor | Level 1 | Level 2 | |
| A | pH | 3 | 5 |
| B | Temperature (˚C) | 25 | 35 |
| C | Fe2+ Concentration (g∙l−1) | 0.6 | 1.2 |
| D | H2O2 Concentration (g∙l−1) | 14 | 28 |
| E | Ozone Flow Rate (g∙h−1) | 0.10 | 0.21 |
| F | Stirring (rpm) | 70 | 150 |
| G | UV radiation | Absent | present |