Statistical Optimization of Bioleaching for Simultaneous Recovery of Cu, Sn, Pb, and Zn from Computer-Printed Circuit Boards

Table 4

The RSM-BBD experimental design: experimental and predicted values.

Run No.	A	B	C	Leaching of heavy metals
				Experimental				Predicted
				Cu	Sn	Zn	Pb	Cu	Sn	Zn	Pb
1	0	0	0	94.6	91.24	94.2	96.2	94.78	91.59	94.70	96.60
2	−1	0	1	92.88	88.76	91.88	93.4	92.85	88.41	91.75	93.76
3	0	−1	1	89.24	89.46	88.76	90.24	89.17	89.03	88.74	90.29
4	1	−1	0	94.16	93.88	90.24	97.46	93.98	93.20	90.65	97.42
5	1	0	−1	92.16	88.68	91.8	96.7	92.19	89.85	91.93	96.34
6	0	1	1	90.23	95.7	94.86	96.46	90.08	95.61	95.40	96.07
7	0	1	−1	88.34	88.68	92.2	91.81	88.41	88.24	92.22	91.76
8	0	0	0	94.8	91.6	94.66	96.4	94.78	91.59	94.70	96.60
9	0	0	0	94.88	91.86	94.88	97.2	94.78	91.59	94.70	96.60
10	−1	0	−1	92.28	91.86	94	95.82	92.03	91.86	94.39	95.84
11	0	0	0	95.4	91.46	94.88	96.01	94.78	91.59	94.70	96.60
12	1	1	0	94.6	93.89	95.6	96.46	94.51	92.88	95.45	96.87
13	0	−1	−1	86.2	94.24	94.6	95.55	86.35	93.47	94.06	95.94
14	−1	−1	0	91.36	88.8	93.8	94.58	91.45	89.30	93.95	94.17
15	−1	1	0	93.7	90.8	94.36	96.27	93.88	90.97	93.95	96.30
16	1	0	1	95.6	95.4	92.8	97.1	95.85	96.23	92.41	97.08
17	0	0	0	94.24	90.66	94.88	97.2	94.78	91.59	94.70	96.60