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Climate impact and energy efficiency from electricity generation through anaerobic digestion or direct combustion of short rotation coppice willow

Ericsson, Niclas and Nordberg, Åke and Sundberg, Cecilia and Ahlgren, Serina and Hansson, Per-Anders (2014). Climate impact and energy efficiency from electricity generation through anaerobic digestion or direct combustion of short rotation coppice willow. Applied energy : an international journal. 132, 86-98
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Abstract

Short rotation coppice willow is an energy crop used in Sweden to produce electricity and heat in combined heat and power plants. Recent laboratory-scale experiments have shown that SRC willow can also be used for biogas production in anaerobic digestion processes.

Here, life cycle assessment is used to compare the climate impact and energy efficiency of electricity and heat generated by these measures. All energy inputs and greenhouse gas emissions, including soil organic carbon fluxes were included in the life cycle assessment. The climate impact was determined using time-dependent life cycle assessment methodology.

Both systems showed a positive net energy balance, but the direct combustion system delivered ninefold more energy than the biogas system. Both systems had a cooling effect on the global mean surface temperature change. The cooling impact per hectare from the biogas system was ninefold higher due to the carbon returned to soil with the digestate.

Compensating the lower energy production of the biogas system with external energy sources had a large impact on the result, effectively determining whether the biogas scenario had a net warming or cooling contribution to the global mean temperature change per kWh of electricity. In all cases, the contribution to global warming was lowered by the inclusion of willow in the energy system. The use of time-dependent climate impact methodology shows that extended use of short rotation coppice willow can contribute to counteract global warming.

Authors/Creators:Ericsson, Niclas and Nordberg, Åke and Sundberg, Cecilia and Ahlgren, Serina and Hansson, Per-Anders
Title:Climate impact and energy efficiency from electricity generation through anaerobic digestion or direct combustion of short rotation coppice willow
Series/Journal:Applied energy : an international journal (0306-2619)
Year of publishing :2014
Volume:132
Page range:86-98
Number of Pages:13
Publisher:Elsevier Ltd.
ISSN:0306-2619
Language:English
Publication Type:Journal article
Refereed:No
Article category:Scientific peer reviewed
Version:Submitted version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Renewable Bioenergy Research
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Keywords:Land use change, Soil carbon, Life cycle assessment, Time-dependent climate impact, Biogas, Combined heat and power
URN:NBN:urn:nbn:se:slu:epsilon-e-2146
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2146
Additional ID:
Type of IDID
DOI10.1016/j.apenergy.2014.06.049
ID Code:11503
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:02 Oct 2014 09:41
Metadata Last Modified:12 Apr 2015 10:05

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