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[{"key": "dc.contributor.author", "value": "Parajuli, Prakash", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2011-10-06T19:02:59Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2011-10-06T19:02:59Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2011", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1184919", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/36767", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "There are several techniques for the measurement of laboratory scale biogas production. This thesis describes the study and evaluation of the most significant and commonly used biogas measurement techniques and analyzes the source of errors associated with the measurement of biogas production. Firstly, inaccuracy mainly due to biogas carbon dioxide (CO\u2082) dilution in displaceable liquids and losses to atmosphere of dissolved CO\u2082 was evaluated by testing solubility of CO\u2082 in different barrier solutions. Saturated acidified brine solution showed lower CO\u2082 solubility among the tested solutions. An accurate, simple, automated and easy to calibrate laboratory scale liquid displacement gas measuring device was built and tested. Headspace gas chromatography (HS-GC) analysis and errors that could arise due to solubility, concentration and temperature influence were also investigated. Experimental analysis using dry and saturated synthetic bio-gas samples were carried at different temperatures. Gas chromatography results showed significant changes in methane (CH4) and CO\u2082 concentration when incubated at 5, 35, 55 & 70 \u00b0C and compared with standard prepared at room temperature (23 \u00b0C). Errors at thermphilic temperatures were much higher than at 35 or 5 \u00b0C. One of the possible and easy means of avoiding errors was found by maintaining the same temperature for both standard and samples during the entire GC experimental analysis. This was performed by cooling the assays to room temperature for a short period of measurement time. This short fluctuation of temperature and its effect on the entire anaerobic process and microbiological activity was also examined. Errors that could arise during the gas measurement and analysis were pointed out and the possible means of corrections were discussed.", "language": null, "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Prakash Parajuli (prparaju) on 2011-10-06 19:02:43.883134. 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 2011-10-06T19:02:59Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-2011100611506.pdf: 785817 bytes, checksum: d82fce4655fac1f4d92ec8d689a7d758 (MD5)\nlicense.html: 4263 bytes, checksum: cc742e564d3ebc5af5ea5c9645b83465 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2011-10-06T19:02:59Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-2011100611506.pdf: 785817 bytes, checksum: d82fce4655fac1f4d92ec8d689a7d758 (MD5)\nlicense.html: 4263 bytes, checksum: cc742e564d3ebc5af5ea5c9645b83465 (MD5)\n Previous issue date: 2011", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "38 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": "anaerobic digestion", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "biogas measurement", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "errors", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "liquid displacement", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "biogas meter", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "gas chromatography.", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Biogas measurement techniques and the associated errors", "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-2011100611506", "language": null, 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Chemistry", "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": "Uusiutuva energia (maisteriohjelma)", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Master's Degree Programme in Renewable Energy", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.date.updated", "value": "2011-10-06T19:03:00Z", "language": null, "element": "date", "qualifier": "updated", "schema": "dc"}, {"key": "dc.type.coar", "value": 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