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Assessment of a full-scale solid-state anaerobic co-digestion: A multi-component substrate analysis by using ORWARE
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.
2022 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 146, p. 36-43Article in journal (Refereed) Published
Abstract [en]

Long-term sustainable biogas production requires different raw material alternatives, especially when reducing the most desirable organic substrate, food waste, which has been set as a goal in the 2030 Agenda. In Sweden, horse manure (HM) is generated in large quantities, and due to its physical and chemical characteristics, it has the potential to be used as a raw material to produce biogas through anaerobic digestion (AD). In order to investigate the challenges that HM digestion can impose in terms of methane yield and/or digestate quality, the modified ORganic WAste REsearch (ORWARE) AD model was applied. The aim was to study the effects of different substrates and combinations of these on the AD process during a full-scale solid-state (SS)-AD. In this sense, the model allows for the analysis of the digestion process of multicomponent substrates at the element level. The simulation results suggested that the replacement of green waste (GW) by HM with wood chips as bedding material gave the best improvement in terms of energy turnover; the liquid fraction of the digestate of this mixture of substrates presented the highest concentration in all the nutrients analyzed, specifically in total carbon-biological and phosphorus. The nutrient concentrations in the digestate from the aforementioned scenario are in line with the SPCR120 certification.

Place, publisher, year, edition, pages
Elsevier , 2022. Vol. 146, p. 36-43
Keywords [en]
Solid-state co-digestion, Digestate, Full-scale, Horse manure, Modelling
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:hig:diva-38545DOI: 10.1016/j.wasman.2022.04.042ISI: 000804701700002PubMedID: 35561541Scopus ID: 2-s2.0-85129712012OAI: oai:DiVA.org:hig-38545DiVA, id: diva2:1659544
Note

Funding agency: Gästrike Återvinnare Utveckling AB

Available from: 2022-05-20 Created: 2022-05-20 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, Zhao

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