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Cow manure and biowaste as a biogas substrate : a review

Show simple item record 2020-06-17T09:48:36Z 2020-06-17T09:48:36Z 2020-06-17
dc.title Cow manure and biowaste as a biogas substrate : a review en
ethesis.discipline.URI none
ethesis.department Maataloustieteiden osasto fi
ethesis.department Department of Agricultural Sciences en
ethesis.department Avdelningen för lantbruksvetenskaper sv
ethesis.faculty Maatalous-metsätieteellinen tiedekunta fi
ethesis.faculty Faculty of Agriculture and Forestry en
ethesis.faculty Agrikultur- och forstvetenskapliga fakulteten sv
ethesis.faculty.URI Helsingin yliopisto fi University of Helsinki en Helsingfors universitet sv
dct.creator Zhao, Chuanhui
dct.issued 2020
dct.language.ISO639-2 eng
dct.abstract The research of this thesis was focused on anaerobic digestion of cow manure mixed with different types of biowaste, especially those material that are available in Finland. The research was conducted by search, collection, and analysis of different data in literature. Topic of the thesis was predetermined by the Co-Creation Lab project of Helsinki Institute of Sustainability Science (HELSUS), which was seeking solution to achieve carbon neutral cow milk production. The solution was co-approached by three participants conducting thesis from technological, economical, and legislative points of view, in which I was responsible for writing mainly the technological part, and general findings in economic efficiency and legislative terms by the other two co-creators were also included in this thesis. The research was mainly related with the whole cycle of biogas production, including basics about anaerobic digestion (AD), applications of the biogas and digestate as a product and by-product of AD. Substrates for AD were researched with a focus to find the best combination of cow manure (CM) and biowaste in regard with methane yield outcome, especially a mixture of CM and silage waste that suits the cow farming situation in Finland. Methane yields for mono-digestion of various types of biowaste and co-digestion of CM with different biomass were collected and analyzed. Premises for biogas plant establishment were researched briefly, including facility composition, and consideration of feasibility and raw material availability. CM with grass containing 75% timothy and 25% meadow fescue grass at 70%:30% mixing ratio could be the best combination of CM: grass co-digestion, followed by 0.5:0.5 mixed CM and perennial ryegrass. Furthermore, CM mixed with food waste at 52:48% ratio could be the best combination among co-digestion of CM with biowaste other than grass, followed by CM and food waste mixed with 68%:32% ratio, and CM with oat straw mixed at 1:2 ratio could be a considerable combination of CM and crop waste. en
dct.subject Anaerobic digestion (AD)
dct.subject cow manure (CM)
dct.subject waste
dct.subject co-digestion
dct.subject biogas
dct.subject methane.
dct.language en
ethesis.language English en
ethesis.language englanti fi
ethesis.language engelska sv
ethesis.supervisor Mikkola, Hannu
ethesis.thesistype pro gradu -tutkielmat fi
ethesis.thesistype master's thesis en
ethesis.thesistype pro gradu-avhandlingar sv
dct.identifier.ethesis E-thesisID:78e90f28-27fc-4a4a-ac46-a11a81a3ae6d
ethesis-internal.timestamp.reviewStep 2020-05-22 09:57:37:282
ethesis.principalprofessor Alakukku, Laura
dct.identifier.urn URN:NBN:fi:hulib-202006173090
dc.type.dcmitype Text
ethesis.facultystudyline Agroteknologia fi
ethesis.facultystudyline Agrotechnology en
ethesis.facultystudyline Agroteknologi sv
ethesis.mastersdegreeprogram Maataloustieteiden maisteriohjelma fi
ethesis.mastersdegreeprogram Master's Programme in Agricultural Sciences en
ethesis.mastersdegreeprogram Magisterprogrammet i lantbruksvetenskaper sv

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