Biogas production from ensiled maize with and without hydrothermal pretreatment

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dc.contributor.author Koponen, Hanna
dc.date.accessioned 2011-01-09T17:40:52Z
dc.date.available 2011-01-09T17:40:52Z
dc.date.issued 2010
dc.identifier.uri http://urn.fi/URN:NBN:fi:jyu-201101091009 en
dc.identifier.uri http://hdl.handle.net/123456789/25765
dc.description.abstract Energy crops are suitable substrates for anaerobic digestion. In the future their use will probably increase, and among other things optimum storage and pretreatment technologies should be developed. In this study eight maize silage varieties grown in Piikkiö, Southern Finland were used as substrates in anaerobic digestion. Also hydrothermal pretreatment was used to improve the biogas yield. Composition of the maize silage and the pretreated maize silage were analyzed and inhibitors were analyzed from the pretreated maize silage. The maize silages produce methane as much as fresh maizes in previous studies, when losses during the ensiling are taking into account and even 25-50 % more when losses were ignored. KXA7251 produced most methane per volatile solids analyzed before ensiling (VSoriginal) (408±7 l CH4/kgVS) and per cultivation area, whereas Amara produced most methane per volatile solids analyzed after ensiling (VSadded) (470±4 l CH4/kgVS). Howev-er, no variety jumps out when comparing the results of this study and the results of pre-vious studies for fresh maizes. The pretreated silages produce less methane than the un-treated silages, probably because of inhibition. Probable reasons for the inhibition were furans and carboxylic acids. More cellulose, insoluble lignin and ash were analyzed from the solid fraction of the pretreated silage than from the untreated silage, probably caused by hemicellulose degradation during the pretreatment.
dc.format.extent 23
dc.language.iso eng
dc.rights This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. en
dc.rights Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. fi
dc.subject.other hydrothermal pretreatment
dc.subject.other inhibition
dc.subject.other maize silage
dc.title Biogas production from ensiled maize with and without hydrothermal pretreatment
dc.type Book en
dc.identifier.urn URN:NBN:fi:jyu-201101091009
dc.subject.ysa biokaasu
dc.subject.ysa säilörehu
dc.subject.ysa maissi
dc.type.dcmitype Text en
dc.type.ontasot Pro gradu fi
dc.type.ontasot Master's thesis en
dc.contributor.tiedekunta Matemaattis-luonnontieteellinen tiedekunta fi
dc.contributor.tiedekunta Faculty of Mathematics and Science en
dc.contributor.laitos Bio- ja ympäristötieteiden laitos fi
dc.contributor.laitos Department of Biological and Environmental Science en
dc.contributor.yliopisto University of Jyväskylä en
dc.contributor.yliopisto Jyväskylän yliopisto fi
dc.contributor.oppiaine ympäristötiede ja -teknologia (maisteriohjelma) fi

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