Spent Coffee Grounds for Energy Generation

Authors

  • Arthur da Silva Klusener Universidade Federal de Santa Maria - campus Cachoeira do Sul
  • Giovani Leone Zabot Federal University of Santa Maria - campus Cachoeira do Sul
  • Marcus Vinicius Tres Laboratory of Agroindustrial Processes Engineering (LAPE-UFSM)
  • Estevao Santos Laureano da Cunha Department of Mechanical Engineering, Federal University of Santa Maria - campus Cachoeira do Sul
  • Jessica Rocha de Morais Laboratory of Agroindustrial Processes Engineering (LAPE-UFSM)
  • Jefferson Fagundes da Silva Laboratory of Agroindustrial Processes Engineering (LAPE-UFSM)
  • Victoria Lumertz de Souza Laboratory of Agroindustrial Processes Engineering (LAPE-UFSM)

Keywords:

Biofuels, Coffe Grounds, Energy, Environment, Waste utilization

Abstract

Novel purposes have been emerged aiming to adopt alternative biomasses for energy generation. In this work, the utilization of spent coffee grounds (SCG) wastes, a domestic urban reject, is proposed for biofuels production and energy generation. A methodological route was designed and conducted. The moisture content in the coffee grounds varied from 69.02% to 74.68% (± 0.42%). Four different methods were compared for oil content extraction: supercritical CO2, Soxhlet, centrifugation with ethyl ether, and centrifugation with n-hexane. These methods permitted to obtain oil content (mass basis) from 6.67% (± 0.38%) to 23.85% (± 1.85%). The average proportion biodiesel/glycerine from the transesterification of spent coffee grounds oil was 73.2% / 26.8%. The by-product dry mass was submitted to a subcritical hydrolysis process, with different parameters, resulting in fermentable sugars, in concentration within 17 and 64 (grams of sugar / kilograms of spent coffee grounds). A thermoelectrical plant was designed based on bibliography data, resulting in the possibility of generation of 8.26 MW by a 2 kg/s dried coffee grounds mass flow in a boiler. Simultaneously, the energy balance of the main processes was made. The results confirm the possibility of energy generation from spent coffee grounds, introducing this biomass as a future alternative in the Brazilian energetic matrix.

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Published

2022-08-07

How to Cite

Klusener, A. da S., Zabot, G. L., Tres, M. V., Cunha, E. S. L., Morais, J. R., Silva, J. F., & Souza, V. L. (2022). Spent Coffee Grounds for Energy Generation. Revista Interdisciplinar De Pesquisa Em Engenharia, 8(1), 1–12. Retrieved from https://periodicos.unb.br/index.php/ripe/article/view/38167

Issue

Vol. 8 No. 1 (2022): Revista Interdisciplinar de Pesquisa em Engenharia

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Artigos

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