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Digestion of grass silage in a semi-continuously fed reactor at increasing loading rates - Process stability and kinetics evaluatio
Benito Martin, Patricia Cristina; Greger, Manfred; Schlienz, Markus
2014In Venice 2014 5th International Symposium on Energy from Biomass and Waste Proceedings
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Keywords :
mono-digestion; grass silage; organic loading rate
Abstract :
[en] Grass is a popular substrate in agricultural biogas plants in Central and Northern Europe. There is currently limited information about the impact of the organic loading rates (OLR) on methane yields, process stability and kinetics for continuous systems digesting grass silage. Anaerobic mono-digestion of grass silage was evaluated in semi-continuously fed laboratory continuously stirred tank reactors (CSTRs) at increasing loading rates between 1.9 and 4.7gVS/l/d. Results show that digestion of grass silage in one-stage CSTR is feasible and do not present any loading-induced inhibition for the tested OLR range. While the volumetric methane production experienced an increase of 61%, the methane yield only decreased by 13% for the highest OLR. On the other hand, the estimated first-order hydrolysis constant decreased by 24% when increasing the loading from 1.9 to 4.7gVS/l/d, which related with an accumulation of the organic material in the reactor. It was also found that the composition of the grass silage affected the digester performance significantly.
Disciplines :
Biotechnology
Author, co-author :
Benito Martin, Patricia Cristina ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Greger, Manfred ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Schlienz, Markus ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
External co-authors :
no
Language :
English
Title :
Digestion of grass silage in a semi-continuously fed reactor at increasing loading rates - Process stability and kinetics evaluatio
Publication date :
01 December 2014
Event name :
5th International Symposium on Energy from Biomass and Waste
Event organizer :
International Waste Working Group
Event place :
Venice, Italy
Event date :
from 17-11-2014 to 20-11-2014
Audience :
International
Main work title :
Venice 2014 5th International Symposium on Energy from Biomass and Waste Proceedings
Publisher :
CISA, Padova, Italy
ISBN/EAN :
978-88-6265-085-4
Peer reviewed :
Peer reviewed
Available on ORBilu :
since 19 December 2014

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