Investigating two-phase digestion of grass silage for demand-driven biogas applications: Effect of particle size and rumen fluid addition

Wall, David; Allen, Eoin; O’Shea, Richard; O’Kiely, P.; Murphy, Jerry D.

doi:10.1016/j.renene.2015.09.049

Cited by 32 publications

(23 citation statements)

References 27 publications

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“…As the hydrolysate mainly consists of readily degradable material, methane production can be raised within hours [15,49]. On-demand production of biogas was also shown for the lignocellulosic substrate grass silage by operational changes in recirculation [51].…”

Section: Microbial Hydrolysis In a Separate Stagementioning

confidence: 95%

Role of Microbial Hydrolysis in Anaerobic Digestion

2020

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There is a growing need of substrate flexibility for biobased production of energy and value-added products that allows the application of variable biodegradable residues within a circular economy. It can be used to balance fluctuating energy provision of other renewable sources. Hydrolysis presents one of the biggest limitations during anaerobic digestion. Methods to improve it will result in broader process applicability and improved integration into regional material cycles. Recently, one focus of anaerobic digestion research has been directed to systems with a separate hydrolysis–acidogenesis stage as it might be promised to improve process performance. Conditions can be adjusted to each class of microorganisms individually without harming methanogenic microorganisms. Extensive research of separate biomass pretreatment via biological, chemical, physical or mixed methods has been conducted. Nevertheless, several methods lack economic efficiency, have a high environmental impact or focus on specific substrates. Pretreatment via a separate hydrolysis stage as cell-driven biotransformation in a suspension might be an alternative that enables high yields, flexible feeding and production, and a better process control. In this review, we summarize existing technologies for microbial hydrolytic biotransformation in a separate reactor stage and the impacts of substrate, operational parameters, combined methods and process design as well as remaining challenges.

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Section: Microbial Hydrolysis In a Separate Stagementioning

confidence: 95%

Role of Microbial Hydrolysis in Anaerobic Digestion

2020

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“…Researchers already investigated the potential of flexible biogas production and/or biogas storage using flexible feeding patterns of the feedstock for the AD. For example the potential of a two-phase digestion of grass silage to be used as a demand-driven system is investigated and it is concluded that it might offer advantages [37]. Recently, Zealand et al (2017) analyzed the effect of feeding frequency and organic loading rate on biomethane production [38].…”

Section: Discussionmentioning

confidence: 99%

Techno-economic assessment of a microbial power-to-gas plant – Case study in Belgium

et al. 2018

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A successful transition towards a cleaner and more sustainable energy management in 2050 requires the implementation of renewable energy sources on a large scale. Therefore, it is expected that the share of renewable energy will further increase. Due to the introduction of these intermittent energy sources, the need for flexibility in our energy system increases significantly. Power-togas (P2G) is one promising option for providing long term energy storage and for providing flexibility to the electricity system. An interesting, recent technological development is biological methanation. The latter utilizes microorganisms to catalyze the Sabatier reaction. This biological reaction can be achieved at lower temperatures and pressures than when a chemical catalyst is used and has a higher tolerance to contaminations from the CO2 source, process upset or contamination by foreign organisms. We investigate the techno-economic potential of biological methanation (i.e. microbial power-togas concept) using a case study that revolves around anaerobic digestion using mainly municipal organic waste in Belgium. The most important parameters that influence the economic feasibility are the electricity consumption (44 %), operating hours of the electrolyser (14 %), and the investment cost of the electrolyser (14 %). Based on our findings we offer further routes of research that serve to strengthen the business case.

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“…The particle size must also be considered, as it may hinder or benefit microorganisms access due to the available contact area (WALL et al 2016), as well as the proper adjustment of the ratio between forage and manure, which can increase or decrease favorable conditions to degradation (PRAPINAGSORN et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Anaerobic co-digestion of swine manure and forage at two harvesting ages

et al. 2022

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The co-digestion of swine manure with vegetable waste is an alternative that can increase the production of biogas and methane generated by the isolated digestion of manure. However, recommendations that are based on the best ratio between manure and forage, as well as the age of harvest, are still scarce in the literature. This study was conducted to evaluate inclusions (0, 25, 50, 75 and 100%) of the total solids (TS) of Elephant grass (Pennisetum purpureum Schum) harvested at two ages medium age (MA) at 45 days of growth and advanced age (AA) at 90 days in co-digestion with swine manure, using an entirely randomized design in a 5x2 factorial scheme. Batch digesters were used and biogas production was monitored for 12 weeks. There was influence of forage age (P <0.05) on the degradation of solids and neutral detergent fiber, with higher values for the substrates containing MA forage. The highest CH4 yields were obtained by the substrates containing MA forage in the inclusion of 27.7 and 31.6%, being 253.7 and 222.2 L of CH4 per Kg of total or volatile solids. The age of the forages influenced the onset and persistence of biogas production, being advantageous only in the inclusion of 25% of MA forage. The AA forage inclusion is not recommended for co-digestion with swine manure.

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Investigating two-phase digestion of grass silage for demand-driven biogas applications: Effect of particle size and rumen fluid addition

Cited by 32 publications

References 27 publications

Role of Microbial Hydrolysis in Anaerobic Digestion

Role of Microbial Hydrolysis in Anaerobic Digestion

Techno-economic assessment of a microbial power-to-gas plant – Case study in Belgium

Anaerobic co-digestion of swine manure and forage at two harvesting ages

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