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

Table 7

orthogonal designs, Levels of four factors, and experimental results obtained.

Dye (mg/L)	Dye : Fe^+2 (wt/wt)	H2O2 : Fe^+2 (wt/wt)	pH	Actual values		/ ratio
				COD (%)	Decolorization (%)	COD	Decolorization
1	1	1	1	74.8603	98.9496	36.53	39.90
1	2	2	2	53.0726	97.9920	34.50	39.82
1	3	3	3	36.3128	89.5582	32.67	39.04
2	1	2	3	32.6996	83.6843	30.97	38.45
2	2	3	1	80.9886	99.1548	37.92	39.92
2	3	1	2	42.9658	93.8547	28.50	39.45
3	1	3	2	69.0217	99.7837	36.78	39.98
3	2	1	3	34.7826	94.8740	30.62	39.54
3	3	2	1	57.8804	99.8905	35.25	39.99