Biological hydrogen methanation – A review

Lecker, Bernhard; Illi, Lukas; Lemmer, Andreas; Oechsner, Hans

doi:10.1016/j.biortech.2017.08.176

Cited by 156 publications

(111 citation statements)

References 84 publications

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“…Waste to value approaches, also partially represented nowadays by the “power to gas” concept, reveal promising applications in terms of carbon capture and utilization. One of the ideas behind this concept is the re‐evaluation of off‐gas streams that contain CO 2 and H 2 , the latter being obtained from processes using excess renewable electricity, for conversion into methane (CH 4 ) . One example is the CO 2 ‐based biological CH 4 production process .…”

Section: Introductionmentioning

confidence: 99%

Development of a simultaneous bioreactor system for characterization of gas production kinetics of methanogenic archaea at high pressure

Pappenreiter

Zwirtmayr

Mauerhofer³

et al. 2019

Engineering in Life Sciences

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Cultivation of methanogens under high pressure offers a great opportunity in biotechnological processes, one of which is the improvement of the gas‐liquid transfer of substrate gases into the medium broth. This article describes a newly developed simultaneous bioreactor system consisting of four identical cultivation vessels suitable for investigation of microbial activity at pressures up to 50 bar and temperatures up to 145°C. Initial pressure studies at 10 and 50 bar of the autotrophic and hydrogenotrophic methanogens Methanothermobacter marburgensis, Methanobacterium palustre, and Methanobacterium thermaggregans were performed to evaluate the reproducibility of the system as well as to test the productivity of these strains. The strains were compared with respect to gas conversion (%), methane evolution rate (MER) (mmol L‐1 h−1), turnover rate (h−1), and maximum conversion rate (kmin) (bar h−1). A pressure drop that can be explained by the reaction stoichiometry showed that all tested strains were active under pressurized conditions. Our study sheds light on the production kinetics of methanogenic strains under high‐pressure conditions. In addition, the simultaneous bioreactor system is a suitable first step screening system for analyzing the substrate uptake and/or production kinetics of gas conversion and/or gas production processes for barophilic or barotolerant microbes.

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Section: Introductionmentioning

confidence: 99%

Development of a simultaneous bioreactor system for characterization of gas production kinetics of methanogenic archaea at high pressure

Pappenreiter

Zwirtmayr

Mauerhofer³

et al. 2019

Engineering in Life Sciences

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“… Reference scenario. Biogas is upgraded to green gas with appropriate membrane technology . This technology is state‐of‐the‐art and allows creating a CO 2 stream for ex situ bio‐methanation in the scenarios C and D. All electricity used is assumed to be from fossil sources. Bio‐P2M scenario.…”

Section: Methodsmentioning

confidence: 99%

“…If 500 Nm 3 h −1 biogas that contains 45 mol% CO 2 is converted to 500 Nm 3 h −1 green gas with 10.3 mol% CO 2 (Table ), 225 − 52 = 173 Nm 3 h −1 CO 2 must be converted in the bio‐P2M reactor. However, in the bio‐P2M reactor, CO 2 and H 2 molecules are also used for bacterial growth and, because of slip, not all CO 2 and H 2 which is available will be converted to methane . An overall CH 4 /H 2 ratio of 0.22 rather than the theoretical 0.25 has been reported .…”

Section: Methodsmentioning

confidence: 99%

“…P2M technology converts CO 2 to CH 4 , the desired product from biogas plants, by reduction of CO 2 with hydrogen (H 2 ). This can either be accomplished by chemical means (Sabatier reaction: 4H 2 + CO 2 → CH 4 + 2H 2 O) or via a biological route . In the latter case, microorganisms, so‐called hydrogenotrophic methanogenic archaea, perform the conversion.…”

Section: Introductionmentioning

confidence: 99%

“…Two technological routes for bio‐P2M are generally considered: in situ bio‐P2M, in which hydrogen is added directly to an existing biogas installation; and ex situ bio‐P2M, in which the biogas—or only the CO 2 —is combined with hydrogen in a second reactor. This second reactor allows better optimising the conditions for the methanogenic archaea, is easier to combine with CO 2 from non‐biogas sources and can yield green gas or almost pure methane . This way, the ex situ bio‐P2M technology gives more flexibility and is the technology considered here.…”

Section: Introductionmentioning

confidence: 99%

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Farm‐scale bio‐power‐to‐methane: Comparative analyses of economic and environmental feasibility

et al. 2019

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Summary Power‐to‐gas technologies are considered to be part of the future energy system, but their viability and applicability need to be assessed. Therefore, models for the viability of farm‐scale bio‐power‐to‐methane supply chains to produce green gas were analysed in terms of levelised cost of energy, energy efficiency and saving of greenhouse gas emission. In bio‐power‐to‐methane, hydrogen from electrolysis driven by surplus renewable electricity and carbon dioxide from biogas are converted to methane by microbes in an ex situ trickle‐bed reactor. Such bio‐methanation could replace the current upgrading of biogas to green gas with membrane technology. Four scenarios were compared: a reference scenario without bio‐methanation (A), bio‐methanation (B), bio‐methanation combined with membrane upgrading (C) and the latter with use of renewable energy only (all‐green; D). The reference scenario (A) has the lowest costs for green gas production, but the bio‐methanation scenarios (B‐D) have higher energy efficiencies and environmental benefits. The higher costs of the bio‐methanation scenarios are largely due to electrolysis, whereas the environmental benefits are due to the use of renewable electricity. Only the all‐green scenario (D) meets the 2026 EU goal of 80% reduction of greenhouse gas emissions, but it would require a CO2 price of 200 € t−1 to achieve the levelised cost of energy of 65 €ct Nm−3 of the reference scenario. Inclusion of the intermittency of renewable energy in the scenarios substantially increases the costs. Further greening of the bio‐methanation supply chain and how intermittency is best taken into account need further investigation.

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An Overview on Established and Emerging Biogas Upgradation Systems for Improving Biomethane Quality

D’Silva

Isha

Kumar

et al. 2023

Biofuel Extraction Techniques

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Biological hydrogen methanation – A review

Cited by 156 publications

References 84 publications

Development of a simultaneous bioreactor system for characterization of gas production kinetics of methanogenic archaea at high pressure

Development of a simultaneous bioreactor system for characterization of gas production kinetics of methanogenic archaea at high pressure

Farm‐scale bio‐power‐to‐methane: Comparative analyses of economic and environmental feasibility

An Overview on Established and Emerging Biogas Upgradation Systems for Improving Biomethane Quality

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