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Energetic Valorisation of Olive Biomass: Olive-Tree Pruning, Olive Stones and Pomaces
Open AccessFeature PaperArticle

Environmental Assessment of Olive Mill Solid Waste Valorization via Anaerobic Digestion Versus Olive Pomace Oil Extraction

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Departamento de Ingeniería Química y Ambiental, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Camino de los Descubrimientos s/n. 41092 Seville, Spain
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Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio 43, 03043 Cassino, Italy
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Departmnet of Microbiology, National University of Ireland Galway, University Road, H91 TK33 Galway, Ireland
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Department of Civil, Architectural and Environmental Engineering, University of Napoli Federico II, via Claudio 21, 80125 Napoli, Italy
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Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, C/ Profesor García González, 1, 41012 Seville, Spain
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Instituto de Grasa, Spanish National Research Council (CSIC), Ctra. de Utrera, km. 1, 41013 Seville, Spain
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School of Civil Engineering, The University of Queensland, Campus St. Lucia - AEB Ed 49, St Lucia 4067, QLD, Australia
*
Author to whom correspondence should be addressed.
Processes 2020, 8(5), 626; https://doi.org/10.3390/pr8050626
Received: 20 April 2020 / Revised: 19 May 2020 / Accepted: 21 May 2020 / Published: 23 May 2020
Anaerobic digestion is a promising alternative to valorize agrifood wastes, which is gaining interest under an environmental sustainability overview. The present research aimed to compare anaerobic digestion with olive pomace oil extraction, by using life cycle assessment, as alternatives for the valorization of the olive mill solid waste generated in the centrifugation process with a two-outlet decanter from oil mills. In the case of olive pomace oil extraction, two cases were defined depending on the type of fuel used for drying the wet pomace before the extraction: natural gas or a fraction of the generated extracted pomace. The anaerobic digestion alternative consisted of the production of biogas from the olive mill solid waste, heat and electricity cogeneration by the combustion of the generated biogas, and composting of the anaerobic digestate. The life cycle assessment showed that anaerobic digestion was the best alternative, with a global environmental impact reduction of 88.1 and 85.9% respect to crude olive pomace oil extraction using natural gas and extracted pomace, respectively, as fuel. View Full-Text
Keywords: biogas; environmental impact; life cycle assessment; olive pomace; sustainability biogas; environmental impact; life cycle assessment; olive pomace; sustainability
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MDPI and ACS Style

Alonso-Fariñas, B.; Oliva, A.; Rodríguez-Galán, M.; Esposito, G.; García-Martín, J.F.; Rodríguez-Gutiérrez, G.; Serrano, A.; Fermoso, F.G. Environmental Assessment of Olive Mill Solid Waste Valorization via Anaerobic Digestion Versus Olive Pomace Oil Extraction. Processes 2020, 8, 626.

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