Thermal Characterization of Biochars Produced in Slow Co-Pyrolysis of Spent Coffee Ground and Concentrated Landfill Leachate Residue

Engineering Proceedings

article

Ronei de Almeida¹  Francesco Lanero²  Maria Cristina Lavagnolo³  Paolo Sgarbossa²  Roberta Bertani²  Marcelo Mendes Vianna¹  Juacyara Carbonelli Campos¹ 

[1] Inorganic Processes Department, School of Chemistry, Universidade Federal do Rio de Janeiro;Department of Industrial Engineering, University of Padova;Department of Civil, Environmental and Architectural Engineering, University of Padova

关键词: biochar;    landfill leachate;    pyrolysis;    spent coffee ground;    waste management;   

DOI  :  10.3390/ECP2023-14614

来源: mdpi

【 摘 要 】

Resource depletion and climate change have fostered sustainable initiatives in the waste management sector. Pyrolysis (Py) has emerged as an option for valorizing spent coffee grounds (SCG). In addition, inorganic compounds can have catalytic effects on the pyrolytic reaction of organic materials, increasing the char yield and porosity of biochar. This study investigates the slow pyrolysis of SCG using concentrated landfill leachate residue (CLLR) (1:1 wt%) as a pyrolitic additive due to its high salinity. Biochars were characterized based on their thermal behavior to discuss environmental benefits and potential applications. Slow-py experiments were conducted using a lab-scale pyrolizer, and thermal characterization was performed using TA Instruments, specifically the SDTQ600 model. Biochars were characterized by higher water contents and heating rates than those experienced by their feedstocks. It is suggested that the high metal content of CLLR could change the biochar’s thermal stability, decreasing its decomposition temperature. Values were 9.18 wt% and 18.11 MJ kg−1 and 23.25 wt% and 22.05 MJ kg−1 for biochars produced using SCG and SCG and CLLR (1:1 wt%), respectively. Future studies will include biochar ecotoxicity analyses and measure carbon–energy balance.

【 授权许可】

Unknown