Table 4 Parameters of the first-order and modified Gompertz models
First-order kinetics model | Modified Gompertz model | ||||||||
|---|---|---|---|---|---|---|---|---|---|
S/I | B0a | ka | R2 | RMSE | B0a | Rma | λa | R2 | RMSE |
(mL CH4 g−1 VS) | (d −1) | (−) | (−) | (mL CH4 g−1 VS) | (mL CH4 g−1 VS d−1) | (d) | (−) | (−) | |
FW | |||||||||
0.3 | 427 ± 2 | 0.28 ± 0.006 | 0.987 | 9.6 | 417 ± 2 | 69.9 ± 1.5 | 0.00 ± 0.08 | 0.993 | 7.2 |
0.5 | 522 ± 3 | 0.36 ± 0.008 | 0.991 | 14.9 | 506 ± 3 | 127.4 ± 3.8 | 0.00 ± 0.06 | 0.991 | 15.0 |
1.0 | 470 ± 1 | 0.19 ± 0.002 | 0.998 | 4.3 | 457 ± 2 | 48.5 ± 1.0 | 0.00 ± 0.12 | 0.992 | 8.9 |
EW | |||||||||
0.3 | 55 ± 2 | 0.23 ± 0.020 | 0.965 | 3.3 | 52 ± 1 | 11.0 ± 0.9 | 0.66 ± 0.21 | 0.982 | 2.4 |
0.5 | 149 ± 3 | 0.23 ± 0.014 | 0.921 | 9.9 | 140 ± 1 | 31.9 ± 1.4 | 1.16 ± 0.12 | 0.978 | 5.2 |
1.0 | 136 ± 3 | 0.25 ± 0.018 | 0.893 | 10.8 | 127 ± 1 | 35.5 ± 1.3 | 1.51 ± 0.08 | 0.988 | 3.6 |