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

Table 9

ANOVA results.

Factors	Degree of freedom	Sum of squares	Mean Square	ratio	value	Percent contribution (%)
COD (%)
Dye	2	45	45	0.04	0.961	1.32
Dye : Fe^+2	2	167	167	0.15	0.860	4.89
H2O2 : Fe^+2	2	211	211	0.20	0.826	6.17%
pH	2	2995.3	2995.3	21.23	0.002	87.62
Decolorization (%)
Dye	2	53.3	26.7	0.83	0.482	21.6
Dye : Fe^+2	2	18.8	9.4	0.25	0.789	7.61
H2O2 : Fe^+2	2	9.6	4.8	0.12	0.888	3.87
pH	2	165.1	82.6	6.07	0.036	66.2