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Investigating the possibility of applying an ADM1 based model to a full-scale co-digestion plant
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.ORCID-id: 0000-0002-3131-0285
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.ORCID-id: 0000-0002-3485-5440
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH-Royal Institute of Technology, Stockholm, Sweden.ORCID-id: 0000-0003-0300-0762
2017 (engelsk)Inngår i: Biochemical engineering journal, ISSN 1369-703X, E-ISSN 1873-295X, Vol. 120, s. 73-83Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This study investigated the possibility of using a model based on the anaerobic digestion model no. 1 (ADM1) on a full-scale 4000 m3 digester in order to understand how such theoretical models can be applied to a real industrial process. The industrial scale digester co-digests the organic fraction of municipal solid waste, grease trap sludge, and ley crop silage with varying feed rates and amounts of volatile solids. A year of process data was collected. Biogas flow, methane content/flow, and ammonia nitrogen were the variables that the model was best at predicting (index of agreement at 0.78, 0.61/0.77, and 0.68, respectively). The model was also used to investigate the effect of increasing the volatile solids (VS) concentration entering the digester. According to simulation results, increasing the influent VS concentration will increase biogas and methane outflow (from 1.5 million Nm3 methane to more than 2 million Nm3 methane), but decrease the amounts of biogas/methane per unit of volatile solids (from about 264 Nm3methane per tonne VS to below 215 Nm3 methane per tonne VS).

sted, utgiver, år, opplag, sider
Elsevier, 2017. Vol. 120, s. 73-83
HSV kategori
Identifikatorer
URN: urn:nbn:se:mdh:diva-34634DOI: 10.1016/j.bej.2016.12.014ISI: 000395603900009Scopus ID: 2-s2.0-85009230307OAI: oai:DiVA.org:mdh-34634DiVA, id: diva2:1065431
Tilgjengelig fra: 2017-01-16 Laget: 2017-01-16 Sist oppdatert: 2023-09-21bibliografisk kontrollert
Inngår i avhandling
1. System studies of Anaerobic Co-digestion Processes
Åpne denne publikasjonen i ny fane eller vindu >>System studies of Anaerobic Co-digestion Processes
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Production of biogas through anaerobic digestion is one pathway to achieving the European Union (EU) goals of reducing greenhouse gas emissions, increasing the share of renewable energy, and improving energy efficiency. In this thesis, two different models (Anaerobic Digestion Model No. 1 and an artificial neural network) are used to simulate a full-scale co-digester in order to evaluate the feasibility of such models. This thesis also includes models of two systems to study the inclusion of microalgae in biogas plants and wastewater treatment plants. One of the studies is a life-cycle assessment in which replacement of the ley crop with microalgae is evaluated. The other study concerns the inclusion of microalgae in case studies of biological treatment in three wastewater treatment plants. Finally, the co-digestion between microalgae and sewage sludge has been simulated to evaluate the effect on biogas and methane yield. The results showed that Anaerobic Digestion Model No.1 and the artificial neural network are suitable for replicating the dynamics of a full-scale co-digestion plant. For the tested period, the artificial neural network showed a better fit for biogas and methane content than the Anaerobic Digestion Model No. 1. Simulations showed that co-digestion with microalgae tended to reduce biomethane production. However, this depended on the species and biodegradability of the microalgae. The results also showed that inclusion of microalgae could decrease carbon dioxide emissions in both types of plants and decrease the energy demand of the studied wastewater treatment plants. The extent of the decrease in the wastewater treatment plants depended on surface volume. In the biogas plant, the inclusion of microalgae led to a lower net energy ratio for the methane compared to when using ley crop silage. Both studies show that microalgae cultivation is best suited for use in summer in the northern climate.

sted, utgiver, år, opplag, sider
Västerås: Mälardalen University Press, 2017
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 237
HSV kategori
Forskningsprogram
energi- och miljöteknik
Identifikatorer
urn:nbn:se:mdh:diva-36515 (URN)978-91-7485-347-6 (ISBN)
Disputas
2017-11-08, Case, Västerås, 09:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2017-09-27 Laget: 2017-09-26 Sist oppdatert: 2018-09-27bibliografisk kontrollert

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