Evaluating Atmospheric Conditions’ Impact on Spent Coffee Grounds Biochar Production

This study investigates the impact of atmospheric conditions, temperature, and residence time on spent coffee grounds (SCG) biochar production through torrefaction. Statistical analyses reveal that temperature and residence time play significant roles, advocating for oxidative torrefaction as a cost-effective alternative with comparable biochar quality.

March 15, 2024

1–2 minutes

Pambudi, Jongyingcharoen, & Saechua (2024) Thermochemical treatment of spent coffee grounds via torrefaction: A statistical evidence of biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More properties similarity between inert and oxidative conditions. Results in Engineering. https://doi.org/10.1016/j.rineng.2024.102012

Coffee consumption generates substantial waste, notably spent coffee grounds (SCG), a potential biofuel feedstockFeedstock refers to the raw organic material used to produce biochar. This can include a wide range of materials, such as wood chips, agricultural residues, and animal manure. More due to its thermochemical advantages. Torrefaction, a biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More pretreatment method, enhances biochar’s energy properties. Inert torrefaction, utilizing nitrogen, is costlier but improves biochar quality. Conversely, oxidative torrefaction, utilizing oxygen, offers cost-effective production.

This study investigates how atmospheric conditions, temperature, and residence timeResidence time refers to the duration that the biomass is heated during the pyrolysis process. The residence time can influence the properties of the biochar produced. More influence SCG biochar characteristics. Statistical analyses including ANOVA, PCA, and HCA were employed to assess the impact of oxidative and inert torrefaction on biochar quality. Results indicate that temperature and residence timeThis refers to the amount of time that the biomass is heated during the pyrolysis process. The residence time can influence the characteristics of the biochar, such as its porosity and surface area. More exert a greater influence than atmospheric conditions on biochar characteristics.

ANOVA results show insignificant effects of atmospheric conditions on high heating value (HHV) and mass yield. PCA and HCA clustering reveal similar characteristics between oxidative and inert conditions. Consequently, oxidative torrefaction presents a viable alternative to inert torrefaction, promising comparable biochar quality at reduced production costs.

This study underscores the significance of atmospheric conditions in SCG biochar production. By elucidating the interaction between variables, it provides valuable insights for advancing environmentally sustainable energy sources. The findings advocate for the wider adoption of oxidative torrefaction, fostering cost-effective and eco-friendly biochar production. Ultimately, this research contributes to the ongoing efforts in biomass valorization and renewable energy development.