Influences of the substrate feeding regime on methanogenic activity in biogas reactors approached by molecular and stable isotope methods

Z, Lv; Leite, Athaydes Francisco; Harms, Hauke; Richnow, Hans H.; Liebetrau, Jan; Nikolausz, Marcell

doi:10.1016/j.anaerobe.2013.11.005

Cited by 47 publications

(26 citation statements)

References 42 publications

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“…The fast biogas production response to feeding was considered reasonable, since sugar beet is a readily degradable substrate. Mauky et al 12 demonstrated very rapid biogas production response when feeding sugar beet silage, while Lv et al 22 showed that feeding of maize silage increased biogas production from 0.5 to 2 L h -1 within 70-80 min.…”

Section: Discussionmentioning

confidence: 99%

“…Lv et al 22 analysed the impact of reactor feeding regime on methanogenic activities and observed no difference in total gas yield, although the methane concentration decreased temporarily after feeding.…”

Section: Introductionmentioning

confidence: 99%

“…are advantageous. 8,[11][12][13]22 Use of slowly degradable substrates may be feasible in combination with biological, chemical or physical pre-treatment, which increase substrate accessibility to microbes and lead to faster degradation. 23 Mauky et al 12 analysed feeding management strategies with sugar beet silage, maize silage and cattle manure in long term laboratory-scale experiments in continuously stirred tank reactors (CSTR), and found that high flexibility of biogas production could be achieved.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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The total share of intermittent renewable electricity is increasing, intensifying the need for power balancing in future electricity systems. Demand-orientated combined heat and power (CHP) production from biogas has potential for this purpose. An agricultural biogas plant, using cattle manure and sugar beet for biogas and CHP production was analysed here. The model Dynamic Biogas plant Model (DyBiM) was developed and connected to the Anaerobic Digestion Model No. 1 (ADM1). Flexible scenarios were simulated and compared against a reference scenario with continuous production, in order to evaluate the technical requirements and economic implications of demand-orientated production. The study was set in Swedish conditions regarding electricity and heat price and the flexibility approaches assessed were increased CHP and gas storage capacity and feeding management. The results showed that larger gas storage capacity was needed for demand-orientated CHP production, but that feeding management reduced the storage requirement because of fast biogas production response to feeding. Income from 2 electricity increased by 10%, applying simple electricity production strategies to a doubled CHP capacity. However, as a result of the currently low Swedish diurnal electricity price variation and lack of subsidies for demand-orientated electricity production, the increase in income was too low to cover the investment costs. Nevertheless, DyBiM proved to be a useful modelling tool for assessing the economic outcome of different flexibility scenarios for demand-orientated CHP production.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…A change from more to less frequent feeding at the same organic loading rate (OLR) may lead to process disturbance, such as volatile fatty acid (VFA) accumulation, a lower pH, and a mismatch between the growth rates of VFAproducing and -consuming microbes (7,8). Lv et al compared the effects of two feeding regimes (once per day and twice per day) with the same daily organic load on process performance and methanogenesis pathways in maize silage-fed continuously stirred tank reactors (CSTRs) (9). The reactor fed once daily showed that VFAs transiently accumulated with a concomitant reduction in pH after feeding but returned to normal levels before the next feeding event.…”

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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“…[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: 81%

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

et al. 2015

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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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Influences of the substrate feeding regime on methanogenic activity in biogas reactors approached by molecular and stable isotope methods

Cited by 47 publications

References 42 publications

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

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

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

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