Energy and carbon footprints of ethanol production using banana and cooking banana discard: A case study from Costa Rica and Ecuador

Graefe Sophie, Dufour Dominique, Giraldo Andrés, Munoz Luis Armando, Mora Paola, Solis Hortensia, Garcés Hernán, Gonzalez Alonso. 2011. Energy and carbon footprints of ethanol production using banana and cooking banana discard: A case study from Costa Rica and Ecuador. Biomass and Bioenergy, 35 (7) : pp. 2640-2649.

Journal article ; Article de revue à facteur d'impact
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Abstract : Banana and cooking banana (Musa spp.) production systems accumulate a considerable quantity of discard due to high quality demands of markets. Ripe fruits have high sugar contents, which can be easily processed to ethanol. The present study aimed to quantitatively assess the production potential of ethanol from Musa spp. discard and to analyze the energy and carbon (C) footprints of this production system using a life cycle approach. The study compared three case studies differing in management practices, which were (I) a coffee producer's cooperative in Costa Rica using Musa spp. as shade trees, (II) organic banana producers from Ecuador, and (III) conventional banana producers from Ecuador. It was found that banana and cooking banana discard accumulated at a rate of 1.4e3.4 t ha_1, of which around 118e266 l ethanol could be produced on a yearly basis. The case study from Costa Rica yielded a net-energy balance (NEB) of 19.3 MJ l_1 and avoided carbon emissions of 0.48 kg l_1. It was closely followed by the organic banana producers from Ecuador with a NEB of 17.1 MJ l_1 and avoided carbon emissions of 0.44 kg l_1. NEB and avoided carbon emissions for the conventional banana farms in Ecuador were much lower (7.2 MJ l_1 and 0.34 kg l_1). Despite providing economic benefits to farmers through a biomass source that would have been otherwise lost, the study gave clear evidence that the ecological footprint of this ethanol production system is significantly influenced by the resource use during the production life cycle. (Résumé d'auteu)

Mots-clés Agrovoc : Musa, Musa (plantains), Éthanol, Bioénergie, Analyse du cycle de vie, Évaluation de l'impact, Carbone, Impact sur l'environnement, Bilan énergétique

Mots-clés géographiques Agrovoc : Équateur, Costa Rica

Classification Agris : Q70 - Processing of agricultural wastes
Q02 - Food processing and preservation
P06 - Renewable energy resources
P01 - Nature conservation and land resources

Champ stratégique Cirad : Axe 2 (2005-2013) - Biomasse énergie et sociétés du sud

Auteurs et affiliations

  • Graefe Sophie, CIAT (COL)
  • Dufour Dominique, CIRAD-PERSYST-UMR Qualisud (COL)
  • Giraldo Andrés, CIAT (COL)
  • Munoz Luis Armando, CIAT (COL)
  • Mora Paola, CIAT (COL)
  • Solis Hortensia, Coopedota (CRI)
  • Garcés Hernán, ESPOL (ECU)
  • Gonzalez Alonso, CIAT (COL)

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