Study of the digestion process at a full-scale solid-state biogas plant by using ORWARE: Model modification and implementation

• Published in: Waste management (Elmsford) Vol. 107; pp. 133 - 142
• Main Authors: Carlos-Pinedo, Sandra, Wang, Zhao, Eriksson, Ola, Soam, Shveta
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 15-04-2020
• Subjects: Anaerobiosis; Biofuels; Bioreactors; Feedstock; Full-scale; Hållbar stadsutveckling; Methane; Methane production; Solid-state anaerobic digestion; Sustainable Urban Development; System assessment model; Feedstock; Full-scale; Solid-state anaerobic digestion; Methane production; System assessment model
• ISSN: 0956-053X; 1879-2456; 1879-2456
• DOI: 10.1016/j.wasman.2020.03.036

•ORWARE-model was enabled to simulate SS-AD with plug-flow reactor.•Model predicted methane, digestate yield, energy turnover for a full-scale SS-AD.•L-AD and SS-AD at different temperatures had similar methane yield.•Thermophilic SS-AD had higher energy turnover than mesophilic L-AD.
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.