Assessing straw digestate as feedstock for bioethanol production

Stoumpou, Vasileia; Novaković, Jelica; Kontogianni, Nikoleta; Barampouti, Elli Maria; Mai, Sofia; Μουστάκας, Κωνσταντίνος; Malamis, Dimitris; Loizidou, M.

doi:10.1016/j.renene.2020.02.021

Cited by 17 publications

(4 citation statements)

References 26 publications

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“…The second step reduces ethanal to ethanol by alcohol dehydrogenase (ADH), with NADH oxidized to NAD [30]. Alcoholic fermentation does not convert all of the glucose to bioethanol [31]. A portion remains unconverted to bioethanol, while at the same time some of the bioethanol is subject to further reactions, which generate glycerol as a by-product [32].…”

Section: Glycerol Production and Applicationsmentioning

confidence: 99%

Biotechnological Valorization of Waste Glycerol into Gaseous Biofuels—A Review

Kazimierowicz,

Dębowski,

Zieliński

et al. 2024

Energies

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The supply of waste glycerol is rising steadily, partially due to the increased global production of biodiesel. Global biodiesel production totals about 47.1 billion liters and is a process that involves the co-production of waste glycerol, which accounts for over 12% of total esters produced. Waste glycerol is also generated during bioethanol production and is estimated to account for 10% of the total sugar consumed on average. Therefore, there is a real need to seek new technologies for reusing and neutralizing glycerol waste, as well as refining the existing ones. Biotechnological means of valorizing waste glycerol include converting it into gas biofuels via anaerobic fermentation processes. Glycerol-to-bioenergy conversion can be improved through the implementation of new technologies, the use of carefully selected or genetically modified microbial strains, the improvement of their metabolic efficiency, and the synthesis of new enzymes. The present study aimed to describe the mechanisms of microbial and anaerobic glycerol-to-biogas valorization processes (including methane, hydrogen, and biohythane) and assess their efficiency, as well as examine the progress of research and implementation work on the subject and present future avenues of research.

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Section: Glycerol Production and Applicationsmentioning

confidence: 99%

Biotechnological Valorization of Waste Glycerol into Gaseous Biofuels—A Review

Kazimierowicz,

Dębowski,

Zieliński

et al. 2024

Energies

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“…Both biohydrogen and bioethanol have been produced from digestate, generating clean, renewable fuels (Monlau et al, 2015). Challenges of this approach, such as the need of a pretreatment for fibre hydrolysis and/or low volumetric production rates, might limit its implementation, but recent developments are moving the field forwards (Stoumpou et al, 2020). Finally, the production of high value-added compounds from solid digestate has also gained attention lately.…”

Section: Novel/promising Technologies For Digestate Managementmentioning

confidence: 99%

Anaerobic digestate management: an introduction

Guilayn

Capson-Tojo

2022

Anaerobic Digestate Management

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Anaerobic digestion (AD) is a key technology in the current transition from a linear to a circular economy. As such, the number of AD plants has increased considerably in the last decade, and it is expected to further increase substantially in the coming years. This, together with the implementation of policies to foster resource recovery, call for the development and implementation of digestate management approaches that allow the recovery of resources contained within digestate (e.g., water, nutrients, carbon, or energy). Traditional techniques such as thermal drying, incineration, composting, and landfilling allow a safe digestate disposal (and in some cases a certain degree of resource recovery). The development of new technologies such as enhanced precipitation, enhanced thermal conversion processes, photoautotrophic biomass production, and enhanced filtration, is opening the door to a more intensive and efficient recovery of resources. To ensure the implementation of these novel technologies, policies favouring their application must be clearly defined, and legal frameworks must be updated. This book presents a comprehensive review of the state of the art of AD digestate management. Traditional and novel resource recovery approaches are addressed, as well as the main technological challenges that these technologies face (e.g., ecotoxicity issues). To give a holistic overview, the current legal framework regarding digestate reutilisation is also assessed, as well as options for process integration and future perspectives.

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“…Digestate can also be transformed into methanol and hydrogen via gasification and posterior syngas conversion by water gas shift reaction [96]. Other processes consider the treatment of the recalcitrant carbon fraction of digestate, or of the remaining straw, to be further transformed into ethanol via fermentation [97,98]. There is a wide range of possibilities for valorizing digestates as reported by Wang and Lee [99] but the economic feasibility of these alternatives may currently prevent its commercial application.…”

Section: Scenariomentioning

confidence: 99%

Feasibility of Coupling Anaerobic Digestion and Hydrothermal Carbonization: Analyzing Thermal Demand

et al. 2021

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Anaerobic digestion is a biological process with wide application for the treatment of high organic-containing streams. The production of biogas and the lack of oxygen requirements are the main energetic advantages of this process. However, the digested stream may not readily find a final disposal outlet under certain circumstances. The present manuscript analyzed the feasibility of valorizing digestate by the hydrothermal carbonization (HTC) process. A hypothetical plant treating cattle manure and cheese whey as co-substrate (25% v/w, wet weight) was studied. The global performance was evaluated using available data reported in the literature. The best configuration was digestion as a first stage with the subsequent treatment of digestate in an HTC unit. The treatment of manure as sole substrate reported a value of 752 m3/d of biogas which could be increased to 1076 m3/d (43% increase) when coupling an HTC unit for digestate post-treatment and the introduction of the co-substrate. However, the high energy demand of the combined configurations indicated, as the best alternative, the valorization of just a fraction (15%) of digestate to provide the benefits of enhancing biogas production. This configuration presented a much better energy performance than the thermal hydrolysis pre-treatment of manure. The increase in biogas production does not compensate for the high energy demand of the pre-treatment unit. However, several technical factors still need further research to make this alternative a reality, as it is the handling and pumping of high solid slurries that significantly affects the energy demand of the thermal treatment units and the possible toxicity of hydrochar when used in a biological process.

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Assessing straw digestate as feedstock for bioethanol production

Cited by 17 publications

References 26 publications

Biotechnological Valorization of Waste Glycerol into Gaseous Biofuels—A Review

Biotechnological Valorization of Waste Glycerol into Gaseous Biofuels—A Review

Anaerobic digestate management: an introduction

Feasibility of Coupling Anaerobic Digestion and Hydrothermal Carbonization: Analyzing Thermal Demand

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