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Table 3 Isotopic composition of carbon in substrates and products of Experiment 1 and Experiment 2, M1—domination of lactate, M2—domination of butyrate, M3—domination of propionate, M4—domination of acetate

From: Evaluation of acidogenesis products’ effect on biogas production performed with metagenomics and isotopic approaches

Bioreactor

δ13CSUB [‰]

δ13C(CH4) [‰]

δ13C(CO2) [‰]

α13CCO2-CH4

Experiment 1

 M1

− 23.0

− 40.3

1.1

1.043

 M2

− 26.3

− 46.6

0.6

1.050

 M3

− 31.8

− 51.0

− 6.8

1.047

 M4

− 45.4

− 53.3

− 20.9

1.034

Experiment 2

 M1

− 23.0

− 36.2

4.1

1.042

 M2

− 26.3

− 46.1

6.6

1.055

 M3

− 31.8

− 57.0

− 5.4

1.054

 M4

− 45.4

− 57.2

− 33.4

1.026