Demand-Orientated Power Production from Biogas: Modeling and Simulations under Swedish Conditions

Grim, Johanna; Nilsson, Daniel; Hansson, Per‐Anders; Nordberg, Åke

doi:10.1021/ef502778u

Cited by 34 publications

(38 citation statements)

References 39 publications

(122 reference statements)

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“…Different strategies can be employed to obtain a demand-driven biogas supply, including a strategy involving a conventional biogas plant with biogas storage or a strategy involving a conventional biogas plant with a biogas upgrade to biomethane for subsequent storage in a natural gas grid (1)(2)(3). Conventional biogas production with integrated heat and power (CHP) plants are normally run on a semicontinuous substrate feeding regime in order to provide a constant biogas output and electricity generation (4).…”

mentioning

confidence: 99%

Changing Feeding Regimes To Demonstrate Flexible Biogas Production: Effects on Process Performance, Microbial Community Structure, and Methanogenesis Pathways

Mulat

Jacobi

Feilberg

et al. 2016

Appl Environ Microbiol

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Flexible biogas production that adapts biogas output to energy demand can be regulated by changing feeding regimes. In this study, the effect of changes in feeding intervals on process performance, microbial community structure, and the methanogenesis pathway was investigated. Three different feeding regimes (once daily, every second day, and every 2 h) at the same organic loading rate were studied in continuously stirred tank reactors treating distiller's dried grains with solubles. A larger amount of biogas was produced after feeding in the reactors fed less frequently (once per day and every second day), whereas the amount remained constant in the reactor fed more frequently (every 2 h), indicating the suitability of the former for the flexible production of biogas. Compared to the conventional more frequent feeding regimes, a methane yield that was up to 14% higher and an improved stability of the process against organic overloading were achieved by employing less frequent feeding regimes. The community structures of bacteria and methanogenic archaea were monitored by terminal restriction fragment length polymorphism (T-RFLP) analysis of 16S rRNA and mcrA genes, respectively. The results showed that the composition of the bacterial community varied under the different feeding regimes, and the observed T-RFLP patterns were best explained by the differences in the total ammonia nitrogen concentrations, H 2 levels, and pH values. However, the methanogenic community remained stable under all feeding regimes, with the dominance of the Methanosarcina genus followed by that of the Methanobacterium genus. Stable isotope analysis showed that the average amount of methane produced during each feeding event by acetoclastic and hydrogenotrophic methanogenesis was not influenced by the three different feeding regimes.I nterest in a demand-driven biogas supply for flexible electricity production with the aim of balancing the supply of electricity generated from sources producing fluctuating amounts of electricity, such as solar and wind sources, has increased recently. Different strategies can be employed to obtain a demand-driven biogas supply, including a strategy involving a conventional biogas plant with biogas storage or a strategy involving a conventional biogas plant with a biogas upgrade to biomethane for subsequent storage in a natural gas grid (1-3). Conventional biogas production with integrated heat and power (CHP) plants are normally run on a semicontinuous substrate feeding regime in order to provide a constant biogas output and electricity generation (4).Alternatively, flexible biogas production that adapts biogas output to energy demand can be implemented by feeding management, including varying the feeding regimes and substrate composition. The production of larger amounts of biogas can be achieved immediately after feeding, and smaller amounts of biogas production are achieved during the nonfeeding period. Compared to the conventional operation of biogas plants with biogas storage, flexible biogas produc...

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mentioning

confidence: 99%

Changing Feeding Regimes To Demonstrate Flexible Biogas Production: Effects on Process Performance, Microbial Community Structure, and Methanogenesis Pathways

Mulat

Jacobi

Feilberg

et al. 2016

Appl Environ Microbiol

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“…7700 plants [22]. Flexibilization of the energy provision and in particular the biogas sector has been identified as an important task for the future-in Germany [23,24] and also in other European countries [25,26].…”

Section: Status Quomentioning

confidence: 99%

“…Looking at market conditions, there is financial revenue from flexibilization of the energy output; however, without incentives, the income cost balance is negative [23]. Reasons are the low energy prices and the small price fluctuations at the electricity market [25]. …”

Section: Status Quomentioning

confidence: 99%

“…The response characteristics of the overall process chain can be improved by an adequate storage capacity of biogas within the process and a harmonized and controlled operation of gas production, gas storage, and gas utilization. In [25], the positive effect on flexibility options by means of an appropriate feeding strategy is presented.…”

Section: Technologymentioning

confidence: 99%

“…[25] showed that the biological process is stable and controllable. Even the yield is not influenced substantially under rapid changes as [32] shows.…”

Section: Technologymentioning

confidence: 99%

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Today bioenergy plays a major role in the renewable energy provision, for heat and power and for liquid biofuels as well. With an increasing share of renewables on the one hand side and a limited availability of biomass on the other hand, the provision of bioenergy has to consider the demands of the future energy system with high shares of fluctuating wind and solar power. This includes new and improved technologies and concepts for biogas, biomethane, and liquid and solid biofuels, which are discussed in the following, while for the electricity sector, the demand for more flexible provision might take place in the years to come; for more flexible heat provision, the transition is expected in a longer time frame. For their market implementation adopted regulatory framework and price signals from electricity markets are necessary. Review

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In order to expand the potential applications of G-quadruplex structures, we explored the ability of heterochiral oligodeoxynucleotides based on the thrombin-binding aptamer (TBA) sequence to fold into similar complexes, with particular focus on their resistance in biological environments. A combination of CD and NMR techniques was used. Similarly to TBA, the ODN ggTTggtgtggTTgg (lower case letters indicate L residues) is able to fold into a chair-like antiparallel G-quadruplex structure, but has a slightly higher thermal stability. The discovery that heterochiral ODNs are able to form stable G-quadruplex structures opens up new possibilities for their development in several fields, as aptamers, sensors and, as recently shown, as catalysts for enantioselective reactions.

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Demand-Orientated Power Production from Biogas: Modeling and Simulations under Swedish Conditions

Cited by 34 publications

References 39 publications

Changing Feeding Regimes To Demonstrate Flexible Biogas Production: Effects on Process Performance, Microbial Community Structure, and Methanogenesis Pathways

Changing Feeding Regimes To Demonstrate Flexible Biogas Production: Effects on Process Performance, Microbial Community Structure, and Methanogenesis Pathways

Flexible bioenergy supply for balancing fluctuating renewables in the heat and power sector—a review of technologies and concepts

Expanding the Potential of G‐Quadruplex Structures: Formation of a Heterochiral TBA Analogue

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