Enhanced bioconversion of hydrogen and carbon dioxide to methane using a micro-nano sparger system: mass balance and energy consumption

Liu, Ye; Wang, Ying; Wen, Xinlei; Shimizu, Kazuya; Lei, Zhongfang; Kobayashi, Motoyoshi; Zhang, Zhenya; Sumi, Ikuhiro; Yao, Yasuko; Mogi, Yasuhiro

doi:10.1039/c8ra02924e

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…In this way, a better distribution of gas bubbles with smaller sizes will favor mass transfer, thanks to the increase in the overall surface area, but also because of the higher time bubbles would spend inside the digester due to the lower buoyancy force and lower rising speed [133]. The experiences performed by Liu et al [134] demonstrated that introducing hydrogen in the form of nano-bubbles allowed for higher methane production rates than those obtained from micro-bubbles. However, the higher energy requirement to produce such small bubbles may eliminate any benefit associated with a higher methane production rate.…”

Section: Mass Transfer Limitationsmentioning

confidence: 99%

Biological Hydrogen Methanation with Carbon Dioxide Utilization: Methanation Acting as Mediator in the Hydrogen Economy

et al. 2023

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Hydrogen is one of the main energy carriers playing a prominent role in the future decarbonization of the economy. However, several aspects regarding the transport and storage of this gas are challenging. The intermediary conversion of hydrogen into high-density energy molecules may be a crucial step until technological conditions are ready to attain a significant reduction in fossil fuel use in transport and the industrial sector. The process of transforming hydrogen into methane by anaerobic digestion is reviewed, showing that this technology is a feasible option for facilitating hydrogen storage and transport. The manuscript focuses on the role of anaerobic digestion as a technology driver capable of fast adaptation to current energy needs. The use of thermophilic systems and reactors capable of increasing the contact between the H2-fuel and liquid phase demonstrated outstanding capabilities, attaining higher conversion rates and increasing methane productivity. Pressure is a relevant factor of the process, allowing for better hydrogen solubility and setting the basis for considering feasible underground hydrogen storage concomitant with biological methanation. This feature may allow the integration of sequestered carbon dioxide as a relevant substrate.

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Section: Mass Transfer Limitationsmentioning

confidence: 99%

Biological Hydrogen Methanation with Carbon Dioxide Utilization: Methanation Acting as Mediator in the Hydrogen Economy

et al. 2023

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“…was not changed after 10 days. The limit of the methane production rate (VVD) seems to be due to the low solubility of hydrogen and limitations of mass transfer, such as low mixing efficiency between cells in liquid (biocatalyst) and gas (substrate) in the BC [29,30]. VVD is dependent on the gas inflow rate, as shown in Equation (1).…”

Section: Methane Production In the St And Bcmentioning

confidence: 99%

Selective Removal of Water Generated during Hydrogenotrophic Methanation from Culture Medium Using Membrane Distillation

Choi

Kim

et al. 2019

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Methane production was carried out in two different types of reactors using a thermophilic and hydrogenotrophic methanogen, Methanothermobacter sp. KEPCO-1, which converts hydrogen and carbon dioxide into methane at 60 °C. The two reactors used for methane production were stirred-tank reactor (ST) and a bubble column reactor (BC), which were selected because they can provide a good comparison between the medium agitation type and gas–liquid mass transfer. The specific growth rate of KEPCO-1 in the ST and BC was 0.03 h−1 and 0.07 h−1, respectively. The methane conversion rate increased to 77.8 L/L/d in the ST and 19.8 L/L/d in the BC. To prevent the dilution of nutrients in the medium by the water generated during the hydrogenotrophic methanation reaction, a membrane distillation (MD) process was applied to selectively remove water from the culture medium. The MD process selectively removed only water from the medium. Fouling by KEPCO-1 had a negligible effect on flux and showed a high removal performance flux of 16.3 ± 3.1 L/m2/h. By operating the MD process in conjunction with the hydrogenotrophic methanation process, it is possible to prevent the dilution of the nutrients in the medium by the water generated during the methanation process, thereby maintaining stable microbial growth and methanation activity.

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Biotechnology to convert carbon dioxide into biogas, bioethanol, bioplastic and succinic acid using algae, bacteria and yeast: a review

et al. 2023

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Enhanced bioconversion of hydrogen and carbon dioxide to methane using a micro-nano sparger system: mass balance and energy consumption

Abstract: Simultaneous CO2 removal with renewable biofuel production can be achieved by methanogens through conversion of CO2 and H2 into CH4. However, the low gas–liquid mass transfer (kLa) of H2 limits the commercial application of this bioconversion.

Cited by 5 publications

References 43 publications

Biological Hydrogen Methanation with Carbon Dioxide Utilization: Methanation Acting as Mediator in the Hydrogen Economy

Biological Hydrogen Methanation with Carbon Dioxide Utilization: Methanation Acting as Mediator in the Hydrogen Economy

Selective Removal of Water Generated during Hydrogenotrophic Methanation from Culture Medium Using Membrane Distillation

Biotechnology to convert carbon dioxide into biogas, bioethanol, bioplastic and succinic acid using algae, bacteria and yeast: a review

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