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dc.contributor.authorParajuli, Prakash
dc.date.accessioned2011-10-06T19:02:59Z
dc.date.available2011-10-06T19:02:59Z
dc.date.issued2011
dc.identifier.otheroai:jykdok.linneanet.fi:1184919
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/36767
dc.description.abstractThere 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 (CO₂) dilution in displaceable liquids and losses to atmosphere of dissolved CO₂ was evaluated by testing solubility of CO₂ in different barrier solutions. Saturated acidified brine solution showed lower CO₂ 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 CO₂ concentration when incubated at 5, 35, 55 & 70 °C and compared with standard prepared at room temperature (23 °C). Errors at thermphilic temperatures were much higher than at 35 or 5 °C. 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.
dc.format.extent38 sivua
dc.language.isoeng
dc.rightsThis publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.en
dc.rightsJulkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.fi
dc.subject.otheranaerobic digestion
dc.subject.otherbiogas measurement
dc.subject.othererrors
dc.subject.otherliquid displacement
dc.subject.otherbiogas meter
dc.subject.othergas chromatography.
dc.titleBiogas measurement techniques and the associated errors
dc.typeBooken
dc.identifier.urnURN:NBN:fi:jyu-2011100611506
dc.type.dcmitypeTexten
dc.type.ontasotPro gradufi
dc.type.ontasotMaster's thesisen
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Sciencesen
dc.contributor.laitosKemian laitosfi
dc.contributor.laitosDepartment of Chemistryen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.oppiaineUusiutuva energia (maisteriohjelma)fi
dc.contributor.oppiaineMaster's Degree Programme in Renewable Energyen
dc.date.updated2011-10-06T19:03:00Z
dc.rights.accesslevelopenAccessfi
dc.contributor.oppiainekoodi4037
dc.subject.ysobiokaasu
dc.subject.ysomittaustekniikka
dc.subject.ysokromatografia
dc.subject.ysomittarit


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