An environmental and economic analysis of the wood-pellet chain: two case studies in Southern Italy
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Wood pellet heating systems are considered as an essential component of European plans to reduce greenhouse gas (GHG) emissions. The goal of this analysis was to estimate and compare the environmental impacts and the costs of the production of packed wood pellets. Two pellet production systems, using roundwood logs (case 1) and mainly sawdust (case 2), have been analysed in 2015 in Basilicata region (Southern Italy).
A life cycle assessment (LCA) analysis was applied to calculate the environmental impact indicators of each system, whilst a life cycle cost (LCC) analysis was implemented to evaluate the pellets’ cost production. Hence, the functional unit chosen was 1 t of produced pellets. The system boundaries considered for the purpose of the current investigation were from the tree felling to the pellet packaging. In particular, the following activities were considered: motor-manual felling and delimbing with a chainsaw, timber yarding with a tractor along the forest track, loading and transportation of the logs to the collection point, transportation of timber to the factories for a distance of 35 km, pellet production and pellet packaging in low-density polyethylene bags with a total weight of 15 kg bag−1.
Results and discussion
The production of 1 t of pellets emitted about 83 kg of CO2eq in case 1 and 38 kg in case 2. In addition, 2.7 kg of SO2eq and 0.005 kg of PO3 4-eq were produced in case 1 and 1.4 kg of SO2eq and 0.002 kg of PO3 4-eq in case 2. Mineral extraction was equal to 0.9 MJ surplus energy in both cases. Case 1 led to higher environmental impacts (about 50% more), essentially for the operation of pelletisation, and in particular for the higher consumption of electricity that characterised it, whereas the production costs were 172 and 113 € t−1 in case 1 and case 2, respectively. In both study cases, consumption costs (costs for raw material, electricity consumption, fuel usage) were the most important cost items.
Our studies highlight how, in both cases, the operations carried out in the forest produced the minor part of the environmental impact but, at the same time, were the most expensive operations. Further, our studies show how mixing lumbering by-products (sawdust) and forest management products (lumbers) can be an efficient solution to reduce both manufacturing costs and environmental impacts to produce wood pellets.
KeywordsBio-economy Climate change LCA LCC Sustainable forestry Woody biomass residues
This research was carried out in the framework of the project “Smart Basilicata”, which was approved by the Italian Ministry of Education, University and Research (Notice MIUR n. 84/Ric 2012, PON 2007-2013 of 2 March 2012) and was co-funded with the Cohesion Fund 2007-2013 of the Basilicata Regional authority). This work was also co-financed by Regione Basilicata Government-PO FSE Basilicata 2007–2013—from sustainable forest management to market for wood product (Project n. AP/05/2013/REG 2013).
- Bai Y (2009) Life cycle environmental and economic impact of using switchgrass-derived bioethanol as transport fuel. Master program graduation thesis. Netherlands UniversityGoogle Scholar
- Baumann H, Tillman AM (2004) The hitch hiker’s guide to LCA—an orientation in life cycle assessment methodology and application. Studentlitteratur, LundGoogle Scholar
- Bidini G, Cotana F, Buratti C, Fantozzi F, Barbanera M (2006) Analisi del ciclo di vita del pellet da SRF attraverso misure dirette dei consumi energetici. 61° Congresso Nazionale ATI—Perugia 12–15 SettembreGoogle Scholar
- Dinca C, Badea A, Marculescu C, Gheorghe C (2014) Environmental analysis of biomass combustion process [cited 2014 Oct 31]. In: Perlovsky L, Dionysiou DD, Zadeh LA, Kostic MM, Gonzales CC et al (eds) Energy problems and environmental engineering [Internet]: Proceedings of the 3rd WSEAS International Conference on Energy Planning, Energy Saving, Environmental Education (EPESE ‘09); 2009 Jul 1e3, WSEAS Press, Tenerife, Canary Islands, Spain, 2009, pp. 234e238. Available from, http://www.wseas.us/books/2009/lalaguna/EPREWA.pdf
- ETA Florence (2016) Il mercato del pellet in Italia. Energie Rinnovabili. Available on: http://www.pelletsnews.it/it/speciali/130-mercato-pellet-italia.html
- European Commission (2008) Due volte 20 per il 2020. L’opportunità del cambiamento climatico perl’Europa. Available on :http://eurlex.europa.eu/LexUriServ/LexUriServ.do?uri=COM:2008:0030:FIN:IT:PDF
- EU Directive (2009) 2009/28/EC of the European Parliament and of the Council of 23 April 2009 on the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 2003/30/EC. 2009Google Scholar
- Goedkoop M, Spriensma R (2000) Product Ecology Consultants. The Eco-indicator 99. A damage priented method for life cycle impact assessment. Methodology Report, 3rd edn. Product Ecology Consultants, PlotterwegGoogle Scholar
- Guinée JB, Gorrée M, Heijungs R, Huppes G, Kleijn R, De Koning A, Van Oers L, Sleeswijk AW, Suh S, De Haes HAU, De Bruijn H, Van Duin R, Huijbregts MAJ, Lindeijer E, Roorda AAH, Van der Ven BL (2002) In: Guinée JB (ed) Handbook on life cycle assessment, operational guide to ISO standards. Kluwer Academic Publishers, DordrechtGoogle Scholar
- Hiegl W, Janssen R (2009) Pellet market overview report. Available on: https://ec.europa.eu/energy/intelligent/projects/sites/ieeprojects/files/projects/documents/pelletslas_final_results_report.pdf
- Humbert S, De Schryver A, Bengoa X, Margni M, Jolliet O (2012) IMPACT 2002+: user guide. Available on: http://www.quantis-intl.com/pdf/IMPACT2002_UserGuide_for_vQ2.21.pdf
- International Standards Organisation, ISO 14044. Environmental management life cycle assessment—requirements and guidelines. ISO 2006Google Scholar
- International Standards Organisation, ISO 14040. Environmental management life cycle assessment—principles and framework. ISO 2006Google Scholar
- Kang HM, Choi SI, Ryu JY, Lee CK, Sato N (2013) Analysis of economic efficiency on production of wood pellet in Korea. J Fac Agric Kyushu Univ 58(1):175–181Google Scholar
- Ligabue S (2015) Pellet: un mercato in forte evoluzione ma l’Italia è fuori dai giochi. Available on: http://www.blogulisse.it/pellet-un-mercato-in-forte-evoluzione-ma-litalia-e-fuori-dai-giochi/
- Monarca D, Cecchini M, Colantoni A (2011) Plant for the production of chips and pellet: technical and economic aspects of a case study in the central Italy. In: Murgante B, Gervasi O, Iglesias A, Taniar D, Apduhan BO (eds) Computational science and its applications: Proceedings of the 11th International Conference on Computational Science and Applications (ICCSA 2011); 2011, Jun 20–23, vol 6785. Springer, Santander, Berlin, pp 296–306Google Scholar
- Moreno Ruiz E, Weidema BP, Bauer C, Nemecek T, Vadenbo CO, Treyer K, Wernet G (2013) Documentation of changes implemented in ecoinvent Data 3.0. Ecoinvent Report 5 (v4). St. Gallen: the ecoinvent Centre. Available on: http://www.ecoinvent.org/database/database.html
- Project n AP/05/2013/REG (2013) PO FSE Basilicata 2007–2013—from sustainable forest management to market for wood product, Regione Basilicata, Potenza, ItalyGoogle Scholar
- PRé, various authors (2015) SimaPro database manual. Methods library. Available on https://www.pre-sustainability.com/simapro-database-and-methods-library