期刊
ENERGY
卷 137, 期 -, 页码 1130-1143出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2017.04.137
关键词
Anaerobic biogas potential; Biogas; Digestate composition; Life cycle assessment; Organic waste; Renewable energy
资金
- BBVA programme [2015-PO027]
- UE projects LIVE-WASTE [LIFE 12 ENV/CY/000544]
- ManureEcoMine - European Community's Seventh Framework Programme [603744]
- Galician Government [ED431F 2016/001]
- Spanish Ministry of Economy and Competitivity [RYC-2014-14984]
- FEDER (UE)
Assuring environmental sustainable bioenergy production is an international priority nowadays. The objective of this study was to identify the environmental consequences of feedstock selection in biogas production. Two real biogas plants were assessed and compared from a life cycle perspective. Plant A performs the co-digestion of energy crops (78%) and animal waste (22%) while Plant B consumes energy crops (4%), food waste (29%) and animal manure (67%). According to the results, electricity production from biogas implied lower impacts in climate change compared to the existing electric mix. Maize silage (650 Nm(3)/TVSfed) and food waste (660 Nm(3)/TVSfed) appeared as an interesting source of bioenergy. However, the cultivation of energy crops was identified as the main hotspot in Plant A. Finally, the use of organic substrates with lower energy potential and high nutrients concentration such as animal manure (450 Nm(3)/TVSfed) produced higher amounts of digestate, producing impacts in acidification and eutrophication categories. In order to improve the environmental sustainability of bioenergy, specific guide should be established to achieve harmonised life cycle studies. In addition, environmental policies should promote the use of waste streams and prevent the use of energy crops as well as include goals related with acidification and eutrophication impacts. (C) 2017 Elsevier Ltd. All rights reserved.
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