Optimization of Precious Metals Recovery from Electronic Waste by Chromobacterium violaceum Using Response Surface Methodology (RSM)

Table 3

Experimental design with factors and level suggested by Box-Behnken RSM, along with experimental and predicted results.

Run order	Factors			Experimental				Predicted
	X1	X2	X3	Au (mgL^−1)	Ag (mgL^−1)	Au (%)	Ag (%)	Au (%)	(Ag)
1	0.0	0.50	2.625	0.044	0.007	4.50	0.07	11.62	1.45
2	1.0	0.50	2.625	0.227	0.018	23.20	0.73	28.35	2.25
3	0.0	5.00	2.625	0.013	0.002	1.32	0.02	3.83	1.50
4	1.0	5.00	2.625	0.111	0.002	11.33	0.10	4.21	1.29
5	0.0	2.75	0.750	0.050	0.002	2.90	0.07	2.44	1.23
6	1.0	2.75	0.750	0.149	0.020	15.22	0.81	16.73	0.62
7	0.0	2.75	4.500	0.018	0.002	1.81	0.09	0.30	1.52
8	1.0	2.75	4.500	0.101	0.015	10.31	0.62	10.77	1.92
9	0.5	0.50	0.750	0.455	0.021	46.50	0.87	39.83	0.78
10	0.5	5.00	0.750	0.125	0.003	12.81	0.14	18.42	2.95
11	0.5	0.50	4.500	0.389	0.286	39.77	11.65	34.16	8.84
12	0.5	5.00	4.500	0.091	0.002	9.33	0.10	15.99	0.19
13	0.5	2.75	2.626	0.580	0.230	59.24	9.36	59.24	9.36
14	0.5	2.75	2.625	0.580	0.230	59.24	9.36	59.24	9.36
15	0.5	2.75	2.625	0.580	0.230	59.24	9.36	59.24	9.36