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Enhancing Bioenergy Recovery from Agro-food Biowastes as a Strategy to Promote Circular Bioeconomy

Original scientific paper

Journal of Sustainable Development of Energy, Water and Environment Systems
ARTICLE IN PRESS (volume and issue assigned later), 1080320
Elizabeth Duarte1 , Rita Fragoso1, Nicole Smozinski1, Jorge Tavares2
1 Linking Landscape, Environment, Agriculture and Food, Higher Institute of Agronomy, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal
2 Linking Landscape, Environment, Agriculture and Food, School of Agriculture, Polytechnic Institute of Beja, R. 1ยบ de Maio, 7800-000 Beja, Portugal


Agro-food industries produce large amounts of wastes challenging innovative and efficient valorisation strategies promoting the circular bioeconomy concept. Anaerobic digestion technology is an interesting route for bioenergy recovery in the agro-food chain sector. In this work, a simple approach is proposed for assessing energy performance of livestock manure and mixed sewage sludge, as substrate by coupling the potential addition of several agro-food biowastes (co-substrate: fruit and vegetable biowastes, fish canning industry, other manures, coffee wastes, and non-edible crops). The results obtained showed an increase of energy performance indicator ranging from 30 to 250% and 62 to 539%, for livestock manure and mixed sewage sludge, respectively. This conceptual approach for feedstocks promotes the circular bioeconomy as it encourages the stakeholders to a smart use of anaerobic biotechnology at rural-level or urban-level.

Keywords: Anaerobic digestion, Co-digestion, Pre-treatments, Biogas production rate, Specific methane yield, Waste-to-bioenergy, Biowastes management strategy, Sustainable development.

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