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Table 4 Performance of hybrid reactor system at different H2:CO2 ratios (mean  ±  SD)

From: Impact of operational conditions on methane yield and microbial community composition during biological methanation in in situ and hybrid reactor systems

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
  1. CH4 content (without considering H2)  =  %CH4/(%CH4  +  %CO2  ×  100)
  2. The CH4 yield and content, as well as the output gas compositions of hybrid BM, represent the total outcome of both in situ and ex situ reactors
  3. TAN total ammonium nitrogen; AA acetic acid
  4. aParameters measured in ex situ upgrading reactor (HR)
  5. bData from hybrid system [in situ (UR)  +  ex situ (HR)]