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[{"key": "dc.contributor.author", "value": "Wordofa, Gossa", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2014-03-13T09:25:49Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2014-03-13T09:25:49Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2014", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1310654", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/43071", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Biogas has been well known with its wide range of benefits in terms of greenhouse reduction,energy security, creating jobs and generating revenue. However, biological\nconversion of several biogas feedstocks to biogas under anaerobic digestion has proven\ninefficient due to low conversion efficiency. Pretreatment of certain type of biomass has\nbeen known to improve the biodegradability and methane yield of the pretreated biomass.\nIn this study, the effect of thermal pretreatments viz., pressure-cooking with steam (PC1), pressure-cooking with water (PC2), steam pretreatment in steamer and hydrothermal pretreatments on chemical composition and methane potential of kitchen waste was investigated. Grab samples of kitchen waste were collected from Yliot\u00f6 restaurant\nlocated on the Ylist\u00f6nrinne campus of the University of Jyv\u00e4skyl\u00e4. Methane production from untreated and pretreated kitchen waste was determined in batch experiments\nat 35 \u00b0C and 55 \u00b0C.\n\nChemical analyses showed that untreated kitchen waste, which was mainly composed of\nvegetables trimmings (56%), fruit skins and spoilt fruit (43%) and bread (1%), had total\nsolids (TS) content of 12.6 % with volatile solids (VS)/TS ratio of 0.94. PC1, PC2 and\nsteam pretreatment resulted in an increase in TS and VS by 1.6-20.2 % and 0.8-21.1 %,\nrespectively. On the other hand, TS and VS content of hydrothermally pretreated kitchen\nwaste remained more or less unchanged. All pretreatments resulted in an increase in\nsoluble chemical oxygen demand (SCOD), ammonium nitrogen (NH4-N) and total kjeldahl nitrogen (TKN) concentration. However, complete loss of NH4-N was noticed in PC2. Loss of volatile fatty acid (VFA) (41.5-85.7%) was also noticed from all pretreated samples due to high pretreatment temperature used in the study. From untreated kitchen waste, methane yields of 426 ml/gVSoriginal at 35 \u00b0C and 452 ml/gVSoriginal at 55 \u00b0C were obtained. Similarly, methane yields obtained from pretreated kitchen varied from 410-439 ml/gVSoriginal at 35 \u00b0C and 406-462 ml/gVSoriginal at 55 \u00b0C.\n\nThe results indicate that the studied thermal pretreatment methods had affected the\nchemical characteristics of kitchen waste to a large extent but no or little effect on methane yields. An increase in methane yields of 1.9-3.1 % was noticed in pretreatments\nviz., PC1, PC2 and steam pretreatment. The low or no increase in methane yield was probably due to loss of VFA during thermal pretreatment and the possibility of inhibitory\nproducts formation.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Gossa Wordofa (gogaword) on 2014-03-13 09:25:48.413992. Form: Master's Thesis publishing form (1 author) (https://kirjasto.jyu.fi/publish-and-buy/publishing-forms/masters-thesis-publishing-form-1-author). JyX data:", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija@noreply.fi) on 2014-03-13T09:25:49Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201403131339.pdf: 3270668 bytes, checksum: 81fd32c3740d561b0a02902b67b3e2e0 (MD5)\nlicense.html: 4296 bytes, checksum: 64112cbc69a272742befc58504cecad3 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2014-03-13T09:25:49Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201403131339.pdf: 3270668 bytes, checksum: 81fd32c3740d561b0a02902b67b3e2e0 (MD5)\nlicense.html: 4296 bytes, checksum: 64112cbc69a272742befc58504cecad3 (MD5)\n Previous issue date: 2014", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (49 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "Thermal pretreatment", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "kitchen waste", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "biogas", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "anaerobic digestion", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Effect of thermal pretreatment on chemical composition and biogas production from kitchen waste", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201403131339", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Bio- ja ymp\u00e4rist\u00f6tieteiden laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Biological and Environmental Science", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Ymp\u00e4rist\u00f6tiede ja -teknologia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Environmental science and technology", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.date.updated", "value": "2014-03-13T09:25:49Z", "language": null, "element": "date", "qualifier": "updated", "schema": "dc"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4015", "language": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "esik\u00e4sittely", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "biokaasu", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "bioj\u00e4tteet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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