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Conversion Of Carbon Dioxide Into Methane Formation By Methane-producing Bacterium FJ10 Under Pressurized Conditions | 2501
ISSN: 2157-7617
Journal of Earth Science & Climatic Change
Open Access
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In this study, fresh water methane-producing bacterium (MPB), strain FJ10, which used H2
as an electron donor and CO2
as an
electron acceptor, was isolated and chosen as the primary methanogen for the conversion of CO2
into CH4
. Improvements to
culture medium to increase methane formation were investigated using a fractional factorial design in 32 experiments with six
variables under consumption of H2
/CO2
at ratios of 4 and 1. The tested nutrient compositions were NaCl, NH4
Cl, FeSO4
, MgCl2
,
H2
PO4
and yeast extract. Experimental results indicate that yeast extract was essential for growth of strain FJ10 to impact the
conversion of CO2
into CH4
. Strain FJ10 generated maximum CH4
formation with 5.0 g/l of yeast extract. Moreover, optimal
culture conditions for methane production by strain FJ10 were 40?C and pH 8. Approximately 22-25% of CO2
conversion into
CH4
was achieved at an H2
/CO2
ratio of 4 and roughly 2.5-6% of CO2
conversion into CH4
was obtained at an H2
/CO2
ratio of 1
under different pressurized conditions of 1 atm, 50 atm and 100 atm. Under 100 atm, about 6780 ?M CH4
was produced with an
H2
/CO2
ratio of 4 and 4240 ?M CH4
was produced with an H2
/CO2
ratio of 1 under the steady state condition. The kinetic model
for H2
/CO2
utilization and CH4 formation under different pressures was verified by experimental data. Model predictions are in
good agreement with experimental results. The experimental and modeling approaches in this study can be applied to evaluate
the conversion of CO2
into CH4
as an energy source by geo-microorganisms in geological sequestration.
Biography
Yen-Hui Lin has completed his PhD at the age of 36 years from University of Wisconsin-Milwaukee and became a research fellow at Development
Center for Biotechnology in Taiwan. He is an associate professor and published more than 20 papers in reputed professional journals and serving
as an editorial board member of Journal of Bioremediation and Biodegradation.
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