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

Table 2

Experimental design matrix, experimental runs, and predicted values on COD removal and decolorization efficiency.

Independent variables ()					Dependent variables (; (%))
					Actual values		Predicted values
Run	Dye (mg/L)	H2O2 : Fe^+2 (wt/wt)	Dye : Fe^+2 (wt/wt)	pH	COD (%)	Decolorization (%)	COD (%)	Decolorization (%)
1	200	15	30	5.5	75.3	95.4	73.2	95.1
2	200	15	30	5.5	76.4	95.4	73.2	95.1
3	300	25	50	9	62.8	96.8	60.9	95.7
4	200	25	30	5.5	73.4	98.1	69.8	97.5
5	300	5	50	9	34.8	80.0	35.1	79.8
6	200	15	30	5.5	73.4	95.5	73.2	95.1
7	100	5	10	9	66.5	55.8	63.4	59.7
8	100	25	50	2	87.7	99.2	85.3	100.0
9	200	15	30	9	65.8	78.9	67.3	80.3
10	300	15	30	5.5	78.3	94.5	80.2	98.6
11	100	15	30	5.5	77.1	90.1	73.9	86.7
12	100	5	10	2	67.0	93.4	66.1	92.2
13	100	5	50	9	30.2	56.1	32.9	54.4
14	200	15	30	5.5	74.5	95.4	73.2	95.1
15	300	5	10	9	77.9	89.1	79.4	85.9
16	200	5	30	5.5	60.8	84.3	63.3	85.6
17	100	25	10	9	48.0	67.9	50.51	65.1
18	200	15	30	5.5	70.3	94.6	73.20	95.1
19	300	25	10	2	67.4	98.9	63.6	98.3
20	300	5	10	2	61.4	95.2	62.5	95.6
21	100	25	10	2	50.3	97.6	53.1	99.9
22	200	15	10	5.5	67.7	98.2	67.7	97.7
23	300	25	10	9	80.4	84.4	80.5	86.3
24	300	25	50	2	75.5	99.4	81.8	97.7
25	200	15	30	2	74.1	98.3	79.1	97.5
26	100	25	50	9	44.7	73.6	44.9	75.4
27	200	15	50	5.5	62.7	93.5	61.6	94.7
28	200	15	30	5.5	73.4	96.6	73.2	95.1
29	100	5	50	2	72.1	76.5	73.4	76.7
30	300	5	50	2	61.2	78.9	55.9	79.4