Biogas measurement techniques and the associated errors

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dc.contributor.author Parajuli, Prakash
dc.date.accessioned 2011-10-06T19:02:59Z
dc.date.available 2011-10-06T19:02:59Z
dc.date.issued 2011
dc.identifier.uri http://hdl.handle.net/123456789/36767
dc.description.abstract 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 (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.extent 38
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 anaerobic digestion
dc.subject.other biogas measurement
dc.subject.other errors
dc.subject.other liquid displacement
dc.subject.other biogas meter
dc.subject.other gas chromatography.
dc.title Biogas measurement techniques and the associated errors
dc.type Book en
dc.identifier.urn URN:NBN:fi:jyu-2011100611506
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 Environmental science and technology en
dc.contributor.oppiaine Renewable energy en
dc.date.updated 2011-10-06T19:03:00Z

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