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Study of the digestion process at a full-scale solid-state biogas plant by using ORWARE: Model modification and implementation
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.ORCID iD: 0000-0002-2838-6545
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Environmental Science.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Environmental Science.ORCID iD: 0000-0002-5661-2917
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Environmental Science.ORCID iD: 0000-0002-2637-1980
2020 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 107, p. 133-142Article in journal (Refereed) Published
Abstract [en]

The configuration of the reactor influences the digestion process and thus the product yields; other factors such as the rate of biogas production or biogas loss also affect the process specifically with high solid configuration. With these in mind, the ORganic WAste REsearch (ORWARE) anaerobic digestion sub-model was modified to be able to study solid-state anaerobic digestion (SS-AD) (using plug-flow reactor). The simulation results from the updated model agreed with the operational data with respect to methane yield, digestate yield and energy turnover. The model was found to be sensitive to changes in feedstock composition but to a lesser extent to changes in process temperature and retention time. By applying the model on several cases of liquid anaerobic digestion (L-AD), it was noticed that L-AD at mesophilic condition with 25 retention days seemed to be superior to other cases of L-AD with regard to energy turnover. However, even if similar methane production were observed for L-AD and SS-AD, the model suggested higher energy turnover for the case of SS-AD at thermophilic condition, being 10% more in average in comparison with cases of L-AD.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 107, p. 133-142
Keywords [en]
System assessment model, Solid-state anaerobic digestion, Full-scale, Methane production, Feedstock
National Category
Industrial Biotechnology
Research subject
Sustainable Urban Development
Identifiers
URN: urn:nbn:se:hig:diva-32177DOI: 10.1016/j.wasman.2020.03.036ISI: 000536511400015PubMedID: 32283487Scopus ID: 2-s2.0-85082933758OAI: oai:DiVA.org:hig-32177DiVA, id: diva2:1425388
Note

The financial support from the Gästrike Återvinnare Utveckling AB and the research foundation Gästrikeregionens miljö is gratefully acknowledged.

Available from: 2020-04-21 Created: 2020-04-21 Last updated: 2023-12-15Bibliographically approved
In thesis
1. Renewable Energy and Nutrient Valorization from Anaerobic Digestion: Resource-Efficient Solutions
Open this publication in new window or tab >>Renewable Energy and Nutrient Valorization from Anaerobic Digestion: Resource-Efficient Solutions
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents a comprehensive analysis aimed at understanding process performance, methane yield, and key influencing factors within the context of solid-state anaerobic digestion (SS-AD). SS-AD is used to treat organic material with high solids content, which can be challenging to address by alternative methods. The investigation involves modelling and simulation exploring mass and energy balances and the associated environmental implications. To achieve this, a waste management tool, ORganic WAste REsearch (ORWARE) was adapted and validated to suit the unique parameters of SS-AD operating under a plug-flow reactor configuration, representing a specific case study. The search of an optimal feedstock mix that enhances the digestion process and energy performance is highlighted. Findings suggest that feedstock selection significantly affects methane yield in SS-AD systems, and optimizing substrate mixtures can enhance process efficiency. Key considerations include biodegradability and lignocellulosic content. Operational parameters, such as temperature variations, impact the results from the model, while responsiveness of hydraulic retention time and organic loading rate remains limited. A further comparison between a liquid anaerobic digestion (L-AD) vs SS-AD is made, despite similar methane yields, SS-AD outperforms due to higher energy turnover. Additionally, effective management of digestate nutrients is crucial for its biofertilizer use. Beyond the biogas system, the thesis explores interconnected relationships between SS-AD inputs and outputs and their subsequent use as resources for a hydroponic greenhouse production system. The examination of system interconnections and their broader implications emphasizes the importance of comprehensive assessments when integrating biogas systems beyond their conventional applications.

Abstract [sv]

Denna avhandling presenterar en omfattande analys som syftar till att förstå processprestanda, metanutbyte, och viktiga påverkande faktorer inom ramen för torrötning. Torrötning används för att behandla organiskt material med hög torrhalt, vilket kan vara svårt att hantera med alternativa metoder. Undersökningen omfattar modellering och simulering för att utforska mass- och energibalanser och därmed sammanhängande miljökonsekvenser. För att uppnå detta anpassades och validerades ett verktyg för avfallshantering ORganic WAste REsearch (ORWARE) för att passa en torrötnings-anläggning med pluggflödereaktor, vilket representerar en specifik fallstudie. En optimal råvarublandning som förbättrar rötningsprocessen och energiprestanda lyfts fram. Resultaten tyder på att valet av råmaterial avsevärt påverkar metanutbytet i torrötnings-system, och att optimera substratblandningar kan förbättra processeffektiviteten. Viktiga överväganden inkluderar biologisk nedbrytbarhet och lignocellulosahalt. Driftsparametrar, såsom temperaturvariationer, påverkar torrötning, medan känsligheten för hydraulisk retentionstid och organisk belastningshastighet i den modifierade pluggflödereaktor-konfigurationen förblir begränsad. I en jämförelse mellan våtrötning och torrötning så har både teknikerna liknande metanutbyten, men torrötning överträffar på grund av förbättrad energibalans. Avhandlingen undersöker dessutom aspekter bortom biogassystemet. Den utforskar de sammankopplade förhållandena mellan torrötning-utgångar och deras efterföljande användning som resursinsatser för ett hydroponiskt växthusproduktionssystem. Utforskningen av systemsammankopplingar och deras bredare implikationer belyser vikten av omfattande bedömningar när man integrerar biogassystem utöver deras konventionella tillämpningar.

Place, publisher, year, edition, pages
Gävle: Gävle University Press, 2023. p. 70
Series
Doctoral thesis ; 38
Keywords
Solid-state anaerobic digestion, methane yield, digestate, systems analysis, modelling, life cycle assessment, Torrötning, metanutbyte, biogödsel, systemanalys, modellering, livscykelanalys
National Category
Other Environmental Engineering Environmental Management
Identifiers
urn:nbn:se:hig:diva-43263 (URN)978-91-89593-15-2 (ISBN)978-91-89593-16-9 (ISBN)
Public defence
2024-01-18, 12:108, Gävle, 09:00 (English)
Opponent
Supervisors
Available from: 2023-12-20 Created: 2023-11-14 Last updated: 2023-12-20

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Carlos-Pinedo, SandraWang, ZhaoEriksson, OlaSoam, Shveta

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