Table 3 Impact of NPs mixture on biogas yield kinetics.
From: Nanoparticles for improving biogas production and effluent biofertilizer
Parameters | Group | ||||
|---|---|---|---|---|---|
Cow manure- only | Fe + Ni + Co | Fe + Ni | Fe + Co | Ni + Co | |
Measured final biogas yield (mL/g VS)-32 days | 744.70 ± 13.60 | 933.42 ± 16.96 | 928.89 ± 14.45 | 891.29 ± 14.52 | 775.22 ± 14.26 |
Modified Gompertz model (MGM) | |||||
Pm (mL/g VS) | 742.23 ± 9.14 | 952.66 ± 21.20 | 985.21 ± 16.27 | 909.87 ± 17.10 | 767.65 ± 10.09 |
Rm (mL/g VS/d) | 40.18 ± 1.30 | 39.51 ± 1.46 | 43.12 ± 1.28 | 39.88 ± 1.39 | 39.85 ± 1.30 |
λ (d) | 0.221 ± 0.28 | 0.186 ± 0.39 | 0.186 ± 0.30 | 0.186 ± 0.36 | 0.275 ± 0.30 |
Predicted biogas yield (mL/g VS)-32 days | 723.82 ± 13.21 | 886.37 ± 16.10 | 926.93 ± 14.00 | 857.99 ± 13.97 | 744.94 ± 13.69 |
Difference between measured and predicated biogas yield (%) | 2.88 | 5.30 | 0.32 | 3.88 | 1.37 |
R2 | 0.994 | 0.992 | 0.995 | 0.993 | 0.994 |
AIC | 188.12 | 210.53 | 199.89 | 204.24 | 190.35 |
Logistic model (LM) | |||||
Pm (mL/g VS) | 716.16 ± 11.27 | 896.98 ± 21.25 | 931.17 ± 18.02 | 862.78 ± 18.23 | 738.40 ± 12.09 |
Rm (mL/g VS/d) | 38.80 ± 2.03 | 38.96 ± 2.02 | 42.62 ± 1.97 | 39.04 ± 1.99 | 38.57 ± 1.99 |
λ (d) | 0.274 ± 0.52 | 0.242 ± 0.62 | 0.348 ± 0.53 | 0.270 ± 0.60 | 0.139 ± 0.53 |
Predicted biogas yield (mL/g VS)-32 days | 710.75 ± 12.97 | 872.02 ± 15.84 | 910.70 ± 13.75 | 843.87 0 ± 13.74 | 731.46 ± 13.45 |
Difference between measured and predicated biogas yield (%) | 4.77 | 7.04 | 1.99 | 5.61 | 5.98 |
R2 | 0.986 | 0.982 | 0.986 | 0.983 | 0.984 |
AIC | 218.89 | 235.25 | 232.30 | 231.13 | 220.38 |
First-order kinetic model (FOM) | |||||
Pm (mL/g VS) | 895.12 ± 20.39 | 1277.34 ± 31.12 | 1317.43 ± 31.83 | 1175.51 ± 24.34 | 931.42 ± 19.72 |
K(d-1) | 0.059 ± 0.003 | 0.040 ± 0.002 | 0.041 ± 0.002 | 0.044 0 ± 0.002 | 0.056 ± 0.003 |
Predicted biogas yield (mL/g VS)-32 days | 758.05 ± 12.07 | 919.16 0 ± 13.70 | 964.89 ± 14.03 | 890.90 ± 13.66 | 778.48 ± 12.00 |
Difference between measured and predicated biogas yield (%) | 1.79 | 1.55 | 3.87 | 0.043 | 0.42 |
R2 | 0.994 | 0.997 | 0.997 | 0.997 | 0.995 |
AIC | 210.01 | 214.37 | 202.60 | 207.49 | 218.48 |
