Table 2.

BBD matrix with experimental and predicted result.

Run no.	Voltage (V)	Time (min)	pH	CRE (%)
				Fe (Exp)	Fe (Pre)	Al (Exp)	Al (Pre)
1	5	40	5	63.00	64.50	70.00	71.13
2	5	30	7	66.00	62.88	60.00	59.00
3	10	30	5	68.00	68.33	70.00	70.67
4	15	30	3	90.00	93.13	80.00	81.00
5	5	20	5	58.00	58.25	64.00	63.63
6	10	30	5	67.00	68.33	72.00	70.67
7	15	30	7	80.00	78.63	82.00	81.75
8	10	40	3	95.00	92.13	82.00	80.63
9	10	20	7	75.00	77.88	65.00	66.38
10	15	40	5	85.00	84.75	87.00	87.38
11	10	30	5	70.00	68.33	70.00	70.67
12	10	20	3	85.00	83.38	74.00	74.13
13	10	40	7	78.00	79.63	76.00	75.88
14	15	20	5	82.00	80.50	80.00	78.88
15	5	30	3	65.00	66.38	72.00	72.25