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Energy and greenhouse gas balance of decentralized energy supply systems based on organic agricultural biomass

a life cycle perspective

Kimming, Marie (2011). Energy and greenhouse gas balance of decentralized energy supply systems based on organic agricultural biomass. Uppsala : Sveriges lantbruksuniv. , Rapport / Institutionen för energi och teknik, SLU, 1654-9406 ; 028
ISBN 978-91-576-9020-3
[Licentiate thesis]

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Abstract

More and more farms apply organic production methods to reduce their environmental impact, but currently even organic farms are mainly using fossil fuels. Technologies available today or in the near future make it possible to produce heat, electricity and fuels from agricultural residues or woody biomass. The agricultural sector can thereby contribute to the fulfillment of climate goals and energy security without reducing the output of food products. The thesis describes and assesses possible energy supply systems based on biomass from an organic arable farm, using life cycle assessment (LCA) methodology. The impact categories used are energy balance, resource use and greenhouse gas (GHG) emissions. Technical systems are described for the supply of heat and power to a village near the farm, and for energy self-sufficiency at the farm. The systems utilize ley used as green manure, Salix and/or straw as the substrate for energy production, and are compared with a reference system based on fossil fuels. The emission calculations included field operations, processing and soil emissions, with a special model developed for estimating the impact on soil C concentration. The results show that it is possible to supply the village or the farm with energy through the systems described without competing with food production. Ley-based scenarios require higher energy input than scenarios based on Salix, but lower than the scenario based on straw. In the self-sufficient farm system, ley-based scenarios give the highest reduction in GHG, 33% compared with the reference scenario whereas the corresponding reduction from a completely straw-based energy system is 9%. In the village energy supply system, the ley-based system give the highest reduction in GHG with a total of -19 Mg CO2-eq./FU compared with 351 Mg CO2-eq./FU in the reference system. The Salix-based systems give 42 and 60 Mg CO2-eq./FU respectively.

Authors/Creators:Kimming, Marie
Title:Energy and greenhouse gas balance of decentralized energy supply systems based on organic agricultural biomass
Subtitle:a life cycle perspective
Series/Journal:Rapport / Institutionen för energi och teknik, SLU (1654-9406)
Year of publishing :2011
Volume:028
Number of Pages:58
Papers/manuscripts:
NumberReferences
I.M. Kimming, C. Sundberg, Å. Nordberg, A. Baky, S. Bernesson, O. Norén, P.-A. Hansson (2011). Biomass from Agriculture in Small-Scale Combined Heat and Power Plants – a Comparative Life Cycle Assessment. Biomass and Bioenergy DOI:10.1016/j.biombioe.2010.12.027
II.M. Kimming, C. Sundberg, Å. Nordberg, A. Baky, S. Bernesson, O. Norén, P.-A. Hansson (2011). Life Cycle Assessment of Energy Self-Sufficiency Systems Based on Agricultural Residues. Bioresource Technology 102(2), 1425-1432.
Place of Publication:Uppsala
Publisher:Department of Energy and Technology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-9020-3
ISSN:1654-9406
Language:English
Publication Type:Licentiate thesis
Full Text Status:Public
Agrovoc terms:biomass, straw, leys, salix, organic agriculture, agricultural wastes, energy generation, self-sufficiency, environmental impact assessment, life cycle analysis, biogas, gasification, heating, combustion
Keywords:LCA, agricultural residues, energy self-sufficiency, organic agriculture, biogas, gasification, straw, ley, Salix, CHP
URN:NBN:urn:nbn:se:slu:epsilon-3149
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-3149
ID Code:2436
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: Marie Kimming
Deposited On:31 Jan 2011 00:00
Metadata Last Modified:08 Sep 2017 10:53

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