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