Table 6 CCD matrixes for the experimental design and the responses for COD removal.

Runs	Factor 1	Factor 2	Factor 3	Factor 4	Removal Efficiency (%)
Runs	A: pH	B: Time	C: Dose	D: Speed	Actual	Predicted	Residuals
1	6	90	10	200	91.0	90.93	0.07
2	5	120	5	250	75.6	75.18	0.42
3	6	90	10	250	85.5	85.39	0.11
4	6	90	10	200	91.3	90.93	0.37
5	7	60	15	150	81.9	82.14	−0.24
6	6	90	15	200	88.9	88.66	0.24
7	7	60	5	150	80.3	79.96	0.34
8	6	90	10	200	90.9	90.93	−0.03
9	6	90	10	200	91.3	90.93	0.37
10	6	90	5	200	85.9	86.29	−0.39
11	7	120	15	150	79.1	79.56	−0.46
12	5	90	10	200	87.4	87.80	−0.40
13	7	60	5	250	78.4	78.74	−0.34
14	6	120	10	200	88.9	88.90	0.00
15	7	120	5	150	78.2	77.91	0.29
16	5	60	15	250	76.5	76.61	−0.11
17	5	120	15	250	77.2	77.74	−0.54
18	7	60	15	250	80.5	80.39	0.11
19	5	60	5	250	73.8	73.53	0.27
20	6	90	10	200	90.6	90.93	−0.33
21	6	60	10	200	89.2	89.36	−0.16
22	6	90	10	200	90.8	90.93	−0.13
23	7	120	15	250	79.8	79.55	0.25
24	6	90	10	150	88.2	88.47	−0.27
25	5	120	15	150	83.2	82.68	0.52
26	7	90	10	200	89.1	88.85	0.25
27	5	60	15	150	83.4	83.28	0.12
28	5	60	5	150	79.6	79.68	−0.08
29	7	120	5	250	78.1	78.42	−0.32
30	5	120	5	150	79.3	79.60	−0.30

Quick links

Search