Improving Biomethane Production and Mass Bioconversion of Corn Stover Anaerobic Digestion by Adding NaOH Pretreatment and Trace Elements

Table 3

Analysis of full-factor test.

Experimental group	Codes of factor and level (actual levels)			Cumulative biomethane production (mL)
	A (Fe); mg·L^−1·d^−1	B (Co); mg·L^−1·d^−1	C (Ni); mg·L^−1·d^−1
1	1 1.00	1 0.05	1 0.20	10386 ± 94
2	1 1.00	1 0.05	2 0.40	10001 ± 56
3	1 1.00	1 0.05	3 0.60	10666 ± 396
4	1 1.00	2 0.20	1 0.20	10730 ± 62
5	1 1.00	2 0.20	2 0.40	10323 ± 491
6	1 1.00	2 0.20	3 0.60	9638 ± 365
7	1 1.00	3 0.40	1 0.20	10320 ± 118
8	1 1.00	3 0.40	2 0.40	11367 ± 361
9	1 1.00	3 0.40	3 0.60	11132 ± 163
10	2 5.00	1 0.05	1 0.20	9593 ± 274
11	2 5.00	1 0.05	2 0.40	10517 ± 141
12	2 5.00	1 0.05	3 0.60	10839 ± 239
13	2 5.00	2 0.20	1 0.20	10322 ± 456
14	2 5.00	2 0.20	2 0.40	9868 ± 259
15	2 5.00	2 0.20	3 0.60	10076 ± 388
16	2 5.00	3 0.40	1 0.20	10307 ± 101
17	2 5.00	3 0.40	2 0.40	10158 ± 560
18	2 5.00	3 0.40	3 0.60	10861 ± 76
19	3 10.00	1 0.05	1 0.05	10274 ± 367
20	3 10.00	1 0.05	2 0.40	10504 ± 649
21	3 10.00	1 0.05	3 0.20	10340 ± 103
22	3 10.00	2 0.20	1 0.05	10127 ± 441
23	3 10.00	2 0.20	2 0.40	10678 ± 582
24	3 10.00	2 0.20	3 0.20	10116 ± 33
25	3 10.00	3 0.40	1 0.05	10872 ± 156
26	3 10.00	3 0.40	2 0.40	10767 ± 372
27	3 10.00	3 0.40	3 0.20	9837 ± 105