Evaluation of ex-situ hydrogen biomethanation at mesophilic and thermophilic temperatures

Kozak, Melike; Köroğlu, Emre; Cırık, Kevser; Zaimoğlu, Zeynep

doi:10.1016/j.ijhydene.2022.02.072

Cited by 8 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Homoacetogens cannot compete with hydrogenotrophic methanogens for the H 2 /CO 2 substrate, changing even their metabolism, using acetate as substrate and producing back hydrogen and CO 2 , which causes a greater increment in H 2 -consuming species [140]. Increasing fermentation temperature affects gas solubility, but the decrease in this parameter seems to be compensated by the higher assimilation rate demonstrated by the performance of thermophilic microorganisms [141], thus keeping a strong gradient active, which translates into better conversions and higher methane production at higher temperatures [142,143]. Considering that the main limitation of this process is attaining a good transfer between the gas and the liquid phase along with retaining the cellular biomass responsible for hydrogen conversion, injecting hydrogen into typical AD reactors does not seem an efficient and practical way for the conversion of hydrogen into methane as the results clearly indicate.…”

Section: Effect Of Temperaturementioning

confidence: 99%

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

et al. 2023

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of Temperaturementioning

confidence: 99%

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

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Since temperature is a deterministic factor influencing the microbial community structure in anaerobic digestion [ 32 , 33 , 34 ] or methanogenic activity and diversity of methanogenic communities in natural environments [ 35 ], it has also been widely studied in engineered systems. Recent studies have investigated the effect of temperature in gas fermentation of H 2 /CO 2 or syngas [ 18 , 31 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ], and one study modeled syngas biomethanation under mesophilic and thermophilic conditions and found that thermophilic communities showed higher specific methane productivity (18.8 mmol/g VSS/d) than mesophilic counterparts and that modulating the partial pressure of CO 2 can boost the product selectivity towards methane [ 44 ]. Another study found that psychrophilic conditions can inhibit methanogenic activity but either mesophilic or psychrophilic conditions can enrich homoacetogens [ 45 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Inoculum Microbial Diversity in Ex Situ Biomethanation of Hydrogen

et al. 2022

View full text Add to dashboard Cite

The effects of the inoculum origin, temperature or operational changes on ex situ biomethanation by complex microbial communities have been investigated; however, it remains unclear how the diversity of the inoculum influences the process and its stability. We explored the effect of microbial diversity of four inocula (coded as PF, WW, S37 and Nrich) on methane production, process stability and the formation of volatile fatty acids as by-products. The highest methane amounts produced were 3.38 ± 0.37 mmol, 3.20 ± 0.07 mmol, 3.07 ± 0.27 mmol and 3.14 ± 0.06 mmol for PF, WW, S37 and Nrich, respectively. The highest acetate concentration was found in less diverse cultures (1679 mg L−1 and 1397 mg L−1 for S37 and Nrich, respectively), whereas the acetate concentrations remained below 30 mg L−1 in the more diverse cultures. The maximum concentration of propionate was observed in less diverse cultures (240 mg L−1 and 37 mg L−1 for S37 and Nrich cultures, respectively). The highly diverse cultures outperformed the medium and low diversity cultures in the long-term operation. Methanogenic communities were mainly composed of hydrogenotrophic methanogens in all cultures. Aceticlastic methanogenesis was only active in the highly diverse sludge community throughout the experiment. The more diverse the inocula, the more methane was produced and the less volatile fatty acids accumulated, which could be attributed to the high number of microbial functions working together to keep a stable and balanced process. It is concluded that the inoculum origin and its diversity are very important factors to consider when the biomethanation process is performed with complex microbial communities.

show abstract

Biogas upgrading by biotrickling filter: Effects of temperature and packing materials

Huang,

Fan,

et al. 2024

Chemical Engineering Journal

View full text Add to dashboard Cite

Evaluation of ex-situ hydrogen biomethanation at mesophilic and thermophilic temperatures

Cited by 8 publications

References 29 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

Effect of Inoculum Microbial Diversity in Ex Situ Biomethanation of Hydrogen

Biogas upgrading by biotrickling filter: Effects of temperature and packing materials

Contact Info

Product

Resources

About