| 초록 |
Conventional carbon dioxide conversion to methane needs a high temperature and high pressure with excessive energy requirement. However, the biological methanation can be operated at relatively lower temperature with high portion of methane production. This study investigated the variables of bioreactor operation to enhance the efficiency of methane production by Mehtanothermobacter thermoautotrophicus DSM3590, one of thermophilic methanogens having high methane productivity. The bioreactor was continuously operated with a working volume of 1.5L, at 60±2 °C and pH 7.3±0.2 (adjusted with 10% ammonium hydroxide). The stirring speed was increased to enhance the mass transfer between gaseous substrates and liquid methanogen culture. Experiments on various ratio of CO2/hydrogen showed the highest methane production at 1:5. The flow rate of gaseous substrate was also evaluated for optimal methane production. Especially, the pH was one of factors to determine methane production. |
