Energy Recovery Alternatives for Coffee Husk Waste: An Lca-Based Carbon Footprint Analysis of Anaerobic Digestion Technologies

Fernandes, Matheus Augusto de Oliveira; Baêta, Bruno Eduardo Lobo; Adarme, Oscar Fernando Herrera; Fonseca, Alberto

doi:10.2139/ssrn.4435695

Cited by 1 publication

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“…Assuming that 3.3 million tons of coffee waste are generated annually, these values would yield 2977.3, 2261.9, and 3584.3 GWh of potential electrical energy per year, respectively. Considering that to hydrothermically pretreat 1 ton of raw coffee husk, an energy input of 420 MJ/T CH would be needed [35,58,59], the net energy using the C3-20 °C-w/pretreatment condition resulted in a surplus of 3199.25 GWh of energy per year that could be used in other stages of coffee processing or to supply electricity for 494 million residences per year in the southeast region of Brazil where the per capita consumption is 2.60 KWh/hab. per year.…”

Section: Energy Content and Energy Outputmentioning

confidence: 99%

Thermochemical Pretreatment for Improving the Psychrophilic Anaerobic Digestion of Coffee Husks

Yang,

Flores-Rodriguez,

Torres-Albarracin

et al. 2024

Methane

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Psychrophilic anaerobic digestion emerges as an appealing integrated solution for the management of agricultural waste, particularly for farmers in regions where the average temperature does not exceed 26 °C, as seen in coffee cultivation. Therefore, this study seeks to assess the biomethane potential of thermochemical-treated coffee husk through psychrophilic anaerobic digestion (C3-20 °C-w/pretreatment). To examine its viability, outcomes were compared with reactors operating at both mesophilic (C1-35 °C) and psychrophilic (C2-20 °C) conditions, albeit without the use of pretreated coffee husk. The C3-20 °C-w/pretreatment test demonstrated a 36.89% increase (150.47 NmL CH4/g VS; 161.04 NmL CH4/g COD), while the C1-35 °C test exhibited a 24.03% increase (124.99 NmL CH4/g VS; 133.77 NmL CH4/g COD), both in comparison to the C2-20 °C test (94.96 NmL CH4/g VS; 101.63 NmL CH4/g COD). Notably, the C3-20 °C-w/pretreatment trial yielded superior outcomes, accompanied by an associated energy output of 3199.25 GWh/year, sufficient to meet the annual energy demands of 494 residences. This marks an increase of 83 and 182 million residences compared to the mesophilic and psychrophilic AD of CH without pretreatment, respectively.

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Section: Energy Content and Energy Outputmentioning

confidence: 99%