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Combustion characteristics and kinetic analysis of finished leather waste using TG-DSC and transformation behavior of Cr during its combustion

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Abstract

The disposal of finished leather waste (FLW) is difficult, and randomly discarding it may cause pollution to the environment. Because of its high calorific value (~ 16 MJ/kg), FLW could be a potential candidate material for bioenergy production. In this research, the combustion characteristics of FLW were studied using thermogravimetric analysis (TG), and the Flynn–Wall–Ozawa (FWO) and Coats–Redfern (C–R) methods were used to analyze the combustion kinetics. The TG results showed that the main weight loss stage occurred at 230–400 ℃, and the combustion efficiency increased with increasing heating rates. The average activation energies of the uncoated finished leather (UCFL) waste and coated finished leather (CFL) waste in the combustion stage obtained using the FWO method were 261.98 and 218.83 kJ/mol, respectively, which means that the CFL material is easier to burn due to its strong catalytic effect. The C–R analysis results showed that the thermal decomposition stage of FLW can be represented by the assumed random nucleation and its subsequent growth, the rapid combustion stage of collagen fibers by a power law model, and the combustion stage of polymer film-forming substances by a chemical reaction model. Finally, the incineration experiment showed that the removal of organic matter from FLW can be achieved at 800 ℃. However, the incineration ash needs to be disposed of safely because of the Cr(VI) content exceeding the emission limit of 0.25 mg/g (GB15618-2018). These results will help to integrate FLW into municipal incineration systems and provide theoretical guidance for appropriate measures to address the pollution generated in the future.

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The authors declare that all data included in this study are available upon request by contact with the corresponding author

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Authors and Affiliations

  1. Key Laboratory for Green Leather Manufacture Technology of China National Light Industry Council, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China

    Mengru Li, Yanchun Li, Jie Liu & Shan Cao

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  1. Mengru Li
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  2. Yanchun Li
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  3. Jie Liu
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  4. Shan Cao
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Contributions

Mengru Li, methodology, experimentation, data collation and analysis, writing-original draft; Yanchun Li, methodology, supervision, writing-review and editing, language refinement; Jie Liu, supervision, editing, proof reading, language refinement; Shan Cao, proof reading, language refinement.

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Correspondence to Yanchun Li.

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Li, M., Li, Y., Liu, J. et al. Combustion characteristics and kinetic analysis of finished leather waste using TG-DSC and transformation behavior of Cr during its combustion. Biomass Conv. Bioref. (2023). https://doi.org/10.1007/s13399-023-03974-8

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  • DOI: https://doi.org/10.1007/s13399-023-03974-8

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