Research Article
Heterogeneous Photocatalytic Degradation of Dairy Wastewater Using Immobilized ZnO
Table 1
Control variables and levels used on solar reactor experiments.
| Control variables (factors) | Level 1 | Level 2 |
| A: reaction time (min) | 120 | 180 | B: thickness of ZnO (μm) | 50 | 100 | D: pH | 6.0 | 8.0 | G: effluent concentration | 1 : 1 v/v | In natura |
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