Greenhouse Gas Emissions and Energy Balances of Jatropha Biodiesel as an Alternative Fuel in Tanzania

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dc.contributor.authorEshton, Bilha
dc.contributor.authorKatima, Jamidu H. Y
dc.contributor.authorKituyi, Evans
dc.date.accessioned2016-05-27T08:55:55Z
dc.date.available2016-05-27T08:55:55Z
dc.date.issued2013
dc.descriptionFull text can be accessed at http://www.sciencedirect.com/science/article/pii/S0961953413003668en_US
dc.description.abstractThis paper evaluates GHG emissions and energy balances (i.e. net energy value (NEV), net renewable energy value (NREV) and net energy ratio (NER)) of jatropha biodiesel as an alternative fuel in Tanzania by using life cycle assessment (LCA) approach. The functional unit (FU) was defined as 1 tonne (t) of combusted jatropha biodiesel. The findings of the study prove wrong the notion that biofuels are carbon neutral, thus can mitigate climate change. A net GHG equivalent emission of about 848 kg t−1 was observed. The processes which account significantly to GHG emissions are the end use of biodiesel (about 82%) followed by farming of jatropha for about 13%. Sensitivity analysis indicates that replacing diesel with biodiesel in irrigation of jatropha farms decreases the net GHG emissions by 7.7% while avoiding irrigation may reduce net GHG emissions by 12%. About 22.0 GJ of energy is consumed to produce 1 t of biodiesel. Biodiesel conversion found to be a major energy consuming process (about 64.7%) followed by jatropha farming for about 30.4% of total energy. The NEV is 19.2 GJ t−1, indicating significant energy gain of jatropha biodiesel. The NREV is 23.1 GJ t−1 while NER is 2.3; the two values indicate that large amount of fossil energy is used to produce biodiesel. The results of the study are meant to inform stakeholders and policy makers in the bioenergy sector.en_US
dc.identifier.citationEshton, B., Katima, J.H. and Kituyi, E., 2013. Greenhouse gas emissions and energy balances of jatropha biodiesel as an alternative fuel in Tanzania. biomass and bioenergy, 58, pp.95-103.en_US
dc.identifier.doi10.1016/j.biombioe.2013.08.020
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2281
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectJatropha biodieselen_US
dc.subjectGreenhouse gas emissionsen_US
dc.subjectEnergy balancesen_US
dc.subjectLife cycle assessmenten_US
dc.subjectTanzaniaen_US
dc.titleGreenhouse Gas Emissions and Energy Balances of Jatropha Biodiesel as an Alternative Fuel in Tanzaniaen_US
dc.typeJournal Articleen_US
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