2007 Fiscal Year Final Research Report Summary
Sustainable carbon cycle toward mitigation of carbon dioxide emission and regeneration of hydrocarbon resources
| Project/Area Number |
17206090
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Earth system and resources enginnering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SATO Kozo The University of Tokyo, Graduate School of Engineering, Professor (60322038)
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| Co-Investigator(Kenkyū-buntansha) |
MASUDA Yoshihiro The University of Tokyo, Graduate School of Engineering, Associate Professor (50190369)
SUGAI Yuichi Kyushu University, Graduate School of Engineering, Assistant Professor (70333862)
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| Project Period (FY) |
2005 – 2007
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| Keywords | global warming / carbon dioxide / bio-technology / applied microbial engineering / batch culture |
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| Research Abstract |
Carbon dioxide capture and storage (CCS) is one of the feasible technological options for reducing net CO2emissions to the atmosphere. However, further studies on uncertainty parameter such as detention period and leakage CO2 are required toward the practical use. In order to establish sustainable carbon cycle, dPevelopment of carbon conversion processes capable of converting CO2 stored in subsurface by CCS into reusable sources of energy is desired. Regeneration of methane gas pool using microbial processes is thought to be one of the technical options addressing for this issue.
The objectives of the study are to assess the effect of carbon dioxide on the mixed culture system, to increase methane yield by adding methane-producing bacteria that utilize metabolites of hydrogen-producer as substrates, and to accumulate knowledge in the mixed culture system with a view of future modeling. In the mixed culture of HYH-1 and M. thermolithotrophicus, methane production with carbon dioxide gas
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phase was 1.6-fold of that with nitrogen gas-phase. The result showed that more substrate becomes available for acetic acid fermentation, which is the most appropriate pathway for hydrogen production. Next, a methane-producing bacterium that assimilates acetic acid, a main metabolite of hydrogen-producing bacteria, was added to the culture in order to improve methane yield. Methane production increased to 1.5-fold by adding an acetic acid assimilating bacterium, Methanosarcina thermophila, to the two-species mixed culture.
For recovering energy from carbon dioxide sequestrated in subsurface, geochemical effects of acidic and substrate- and nutrient-limiting conditions on methane production by a hydrogenotrophic methanogen Methanothermobacter thermautotrophicus were investigated under simulated in situ conditions of deep saline aquifers using two formation waters retrieved from petroleum reservoirs as medium. Volumetric production rate of methane by anaerobically growing Methanothermobacter thermautotrophicus cells in a defined medium was 2-fold lower at pH5.5 than at pH8.0 and was significantly reduced but still retained 1.5% of productivities at the low pH in combination with nutrient-limiting conditions employing two formation waters as growth media. Less
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Research Products
(24 results)
