Table 2: Taguchi's L8 orthogonal design for the experimental model of photocatalyst treatment of dairy wastewater.

Exp.A
Reaction time
B
Thickness ZnO
C
Interaction AB
D
pH
E
Interaction AD
F
Interaction BD
G
Effluent concentration

11111111
21112222
31221122
41222211
52121212
62122121
72211221
82212112