EXPLORING SPENT COFFEE GROUNDS ENERGY POTENTIAL IN THE BRAZILIAN SCENARIO

de Freitas, Caroline P. M.; Marangon, Bianca B.; Pereira, Emanuele G.; Renato, Natalia dos S.

doi:10.1590/1809-4430-Eng.Agric.v43nepe20220141/2023

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Special Issue: Energy in Agriculture, Scientific Paper • Eng. agríc. 43 (spe) • 2023 • https://doi.org/10.1590/1809-4430-Eng.Agric.v43nepe20220141/2023 copy

EXPLORING SPENT COFFEE GROUNDS ENERGY POTENTIAL IN THE BRAZILIAN SCENARIO

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Coffee stands out worldwide for being widely traded and consumed. However, this consumption generates a large amount of spent coffee grounds (SCGs) that are typically arbitrarily discarded. This biomass has a high heating value and molecular composition that allows for it to be a raw material for generating heat and energy. The search for renewable energy sources should consider the potential of SCGs. Thus, the objective of this study was to estimate the energy potential of SCGs in Brazil. The methodology consisted of searching for data to represent the generation of SCGs in the country and estimate its energy potential. It was found that the amount of SCGs available for power generation through direct combustion was approximately one thousand tons, and the power generation potential was 6.83 TWh/year in Brazil. This energy is sufficient to meet, for example, the total annual demand for public lighting in the country's Southeast. These results are the first steps towards evaluating the potential use of SCGs as an energy source and its environmental benefits. Additionally, this study explored limitations and barriers, providing valuable information for developing routes for using this energy residue and incentives for public policies.

biomass energy; waste-to-energy; renewable energy

HHV, in MJ/kg	Reference	HHV, in MJ/kg	Reference
17.07	Chen & Chen, 2021Chen YC, Chen LY (2021) Pelleting spent coffee grounds by waste utensils as binders of biofuels. Journal of Environmental Chemical Engineering 9(3):105006. DOI: https://doi.org/10.1016/j.jece.2020.105006. https://doi.org/10.1016/j.jece.2020.1050...	25.30	Barbanera & Muguerza, 2020Barbanera M, Muguerza IF (2020) Effect of the temperature on the spent coffee grounds torrefaction process in a continuous pilot-scale reactor. Fuel 262:116493. DOI: https://doi.org/10.1016/j.fuel.2019.116493. https://doi.org/10.1016/j.fuel.2019.1164...
22.38		26.60
24.62		27.30
25.86		29.50
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25.59		21.80	Kim et al., 2017Kim D, Lee K, Bae D, Park KY (2017) Characterizations of biochar from hydrothermal carbonization of exhausted coffee residue. Journal of Material Cycles and Waste Management 19(3):1036-1043. DOI: https://doi.org/10.1007/s10163-016-0572-2. https://doi.org/10.1007/s10163-016-0572-...
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22.00		23.40
23.80		22.74	Bok et al., 2012Bok JP, Choi HS, Choi YS, Park HC, Kim SJ (2012) Fast pyrolysis of spent coffee grounds: Characteristics of product yields and biocrude oil quality. Energy 47(1):17-24. DOI: http://dx.doi.org/10.1016/j.energy.2012.06.003. http://dx.doi.org/10.1016/j.energy.2012....
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24.30		23.72	Zuorro & LaVecchia, 2012Zuorro A, Lavecchia R (2012) Spent coffee grounds as a valuable source of phenolic compounds and bioenergy. Journal of Cleaner Production 34:49-56. DOI: https://doi.org/10.1016/j.jclepro.2011.12.003. https://doi.org/10.1016/j.jclepro.2011.1...
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The arithmetic mean of the values found was 23.35 ± 2.63 MJ/kg.

	Waste Available [Mt/year]	LHV [GJ/t]	Energy availability of the waste [TWh/year]
Rice Straw	14	16.0	61.42
Bean Straw	4	14.0	5.55
Cotton Waste	1	14.6	4.79
Cassava Branches	16	16.0	27.22
Corn Straw	101	17.7	198.26
Soybean Straw	94	14.6	114.5
Wheat Straw	17	12.4	23.33

Sector	North	Northeast	Southeast	South	Midwest
Residential	10.34	30.61	69.99	23.80	13.43
Industrial	14.52	21.11	87.80	32.80	10.10
Commercial	4.95	13.21	42.88	14.45	7.03
Rural	1.15	5.41	9.82	10.55	3.98
Public power	1.54	3.10	5.20	1.49	1.44
Street lighting	1.08	3.93	6.22	2.54	1.68
Public Service	0.74	3.53	9.01	1.88	1.18
Own consumption	0.34	0.24	2.11	0.39	0.05
Total	34.66	81.14	233.03	97.90	38.89

Associação Brasileira de Engenharia Agrícola SBEA - Associação Brasileira de Engenharia Agrícola, Departamento de Engenharia e Ciências Exatas FCAV/UNESP, Prof. Paulo Donato Castellane, km 5, 14884.900 | Jaboticabal - SP, Tel./Fax: +55 16 3209 7619 - Jaboticabal - SP - Brazil
E-mail: revistasbea@sbea.org.br

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[1] *Corresponding author. Federal University of Viçosa/Viçosa - MG, Brazil. E-mail: natalia.renato@ufv.br | ORCID: https://orcid.org/0000-0001-6168-8257