H2:CO2 ratio | pHa | TANa (g L−1) | AAa (mM) | CH4 yieldb (mL gVS−1) | H2 consumptionsb (%) | CH4 content (without considering H2)b (%) | Output gas compositionsb (%) | ||
---|---|---|---|---|---|---|---|---|---|
CH4 | CO2 | H2 | |||||||
2:1 | 8.07 | 1.09 | 4.12 | 257.27  ±  4.28 | 60.23  ±  0.75 | 79.89  ±  1.40 | 63.20  ±  1.44 | 16.10  ±  1.18 | 20.70  ±  0.43 |
4:1 | 8.06 | 1.01 | 4.23 | 234.15  ±  3.70 | 62.22  ±  2.63 | 73.09  ±  2.22 | 50.58  ±  0.93 | 18.64  ±  1.75 | 30.78  ±  0.83 |