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Economic and Energy Valorization of Cassava Stalks as Feedstock for Ethanol and Electricity Production

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Abstract

Cassava (Manihot esculenta) is a woody bush extensively cultivated as an annual crop in tropical and subtropical regions for its edible starchy tuberous root, a major source of carbohydrates. The main residue from its cultivation is the cassava stalk, which is normally used as soil fertilizer or in culture propagation. The main goal of this paper is to evaluate two routes (biochemical and thermochemical) for bioenergy production (ethanol and synthesis gas—electricity) using cassava stalk as raw material. A detailed techno-economic and energy assessment is carried out based on the simulation approach of both conversion routes to determine the production costs of main products and the overall energy efficiency of the processes. The electricity production costs vary from 0.008 to 0.037 USD/MJ, whereas the ethanol production costs range from 1.11 to 2.02 USD/L (including subsidies). The change in the production costs was observed due to the assumptions of the model, e.g., cassava stalk, transportation, and enzyme costs. The overall energy efficiency of the gasification and ethanol fermentation was 68.7 and 25.1%, respectively.

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Funding

The Universidad Nacional de Colombia Sede Manizales and the Dirección Nacional de Investigación (DIMA) financially supported this work through the project “entitled “Contrapartida Vicerrectoria de Investigación 2016 – 2018” Grant No. 201010013030.

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Authors and Affiliations

  1. Departamento de Ingeniería Química, Instituto de Biotecnología y Agroindustria, Universidad Nacional de Colombia sede Manizales, Cra. 27 No. 64-60, Manizales, Colombia

    Carlos A. García-Velásquez, Laura Daza & Carlos A. Cardona

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  1. Carlos A. García-Velásquez
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  2. Laura Daza
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  3. Carlos A. Cardona
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Correspondence to Carlos A. Cardona.

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García-Velásquez, C.A., Daza, L. & Cardona, C.A. Economic and Energy Valorization of Cassava Stalks as Feedstock for Ethanol and Electricity Production. Bioenerg. Res. 13, 810–823 (2020). https://doi.org/10.1007/s12155-020-10098-8

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  • DOI: https://doi.org/10.1007/s12155-020-10098-8

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