| 초록 |
Renewable electricity utilization is expanding worldwide, and uneven production of wind and solar energy can temperately result in excess electricity supply in power grid. This surplus can be used to electrolyze water to produce H2. Nevertheless, H2 as fuel presents some drawbacks related to its low volumetric energy content and difficulty in storage and transport. Biological biogas upgrading, coupling the H2, produced by water electrolysis, with the CO2 in biogas and converting it to CH4, has been recently reported. In this study, we isolated a suitable microorganism, named Methanothermobacter sp. BS-12, for bio-methanation process from the anaerobic digestor in a wastewater treatment plant, Seoul, and confirmed its characteristics. Methanothermobacter sp. BS-12 is a thermophilic methanogen utilizing CO2 and H2 as substrates to produce CH4. To maximize its growth and methanation performance, the pH, temperature, amounts of trace metals and concentration of NaCl were investigated. Also, we proceeded genome sequencing and identified the methane production pathway and related genes. |
