A Comparison of Central Composite Design and Taguchi Method for Optimizing Fenton Process

Table 3

ANOVA results for CCD.

Source	Sum of squares	Degree of freedom	Mean square	value	Prob >
COD removal
Model	4902.21	12	408.52	32.41	<0.0001; (significant)
Dye	173.73	1	173.73	32.41	0.0017
H2O2 : Fe^+2	188.48	1	188.48	13.94	0.0012
Dye : Fe^+2	168.36	1	168.36	14.95	0.002
pH	620.39	1	620.39	13.36	<0.0001
Color Removal
Model	4310.88	14	307.92	49.73	<0.0001; (significant)
Dye	635.94	1	635.94	102.70	<0.0001
H2O2 : Fe^+2	631.55	1	631.55	102	<0.0001
Dye : Fe^+2	38.90	1	38.90	6.28	0.0242
pH	1331.97	1	1331.97	215.12	<0.0001