n˚exp

Factors

Theorical phosphate removal Y_calc (%)

Experimental Phosphate

removal Y_exp

(%)

Average Experimental Phosphate removal Y_exp

(%)

Coded variables

Reals variables

X₁

X₂

U₁ (˚C)

U₂ (H)

14

+1.414

+1.414

100

16

93.30

88.65

15

+1.414

+1.414

100

16

93.30

89.03

89.32

16

+1.414

+1.414

100

16

93.30

90.30