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Research Article

A Single-Culture Bioprocess of Methanothermobacter thermautotrophicus to Upgrade Digester Biogas by CO2-to-CH4 Conversion with H2

Table 2

Average volumetric methane production rates and hydrogen conversion efficiencies for Experiment 1. Averages were taken for experimental values in Figure 2 at each hydrogen influent rate from 3 or 4 days. Standard deviations (SD) were calculated based on the values used to calculate the average.

H2 influent rate (L/min) ( )0.10.20.40.81.6
Number of data points
Average VMPR (L/L culture-day)9.9318.534.047.940.4
SD0.160.870.421.402.53
Average H2 conversion efficiency96.6%89.9%82.7%58.2%24.5%
SD1.60%4.23%1.02%1.70%1.54%