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Pyrolysis Valorization of Vegetable Wastes: Thermal, Kinetic, Thermodynamics, and Pyrogas Analyses

Author

Listed:
  • Samar Elkhalifa

    (Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha P.O. Box 5825, Qatar)

  • Sabah Mariyam

    (Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha P.O. Box 5825, Qatar)

  • Hamish R. Mackey

    (Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha P.O. Box 5825, Qatar)

  • Tareq Al-Ansari

    (Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha P.O. Box 5825, Qatar
    Division of Engineering Management and Decision Sciences, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha P.O. Box 5825, Qatar)

  • Gordon McKay

    (Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha P.O. Box 5825, Qatar)

  • Prakash Parthasarathy

    (Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha P.O. Box 5825, Qatar)

Abstract

In comparison to other methods, valorising food waste through pyrolysis appears to be the most promising because it is environmentally friendly, fast, and has a low infrastructure footprint. On the other hand, understanding the pyrolytic kinetic behaviour of feedstocks is critical to the design of pyrolysers. As a result, the pyrolytic degradation of some common kitchen vegetable waste, such as tomato, cucumber, carrot, and their blend, has been investigated in this study using a thermogravimetric analyser. The most prevalent model fitting method, Coats–Redfern, was used for the kinetic analysis, and the various mechanisms have been investigated. Some high-quality fitting mechanisms were identified and used to estimate the thermodynamic properties. As the generation of pyrolysis gases for chemical/energy production is important to the overall process applicability, TGA-coupled mass spectrometry was used to analyse the pyrogas for individual and blend samples. By comparing the devolatilization properties of the blend with single feedstocks, the presence of chemical interactions/synergistic effects between the vegetable samples in the blend was validated. The model, based on a first-order reaction mechanism, was found to be the best-fitting model for predicting the pyrolysis kinetics. The calculated thermodynamic properties (ΔH (enthalpy change ≈ E (activation energy))) demonstrated that pyrolysis of the chosen feedstocks is technically feasible. According to the TGA–MS analysis, blending had a considerable impact on the pyrogas, resulting in CO 2 composition reductions of 17.10%, 9.11%, and 16.79%, respectively, in the cases of tomato, cucumber, and carrot. Overall, this study demonstrates the viability of the pyrolysis of kitchen vegetable waste as a waste management alternative, as well as an effective and sustainable source of pyrogas.

Suggested Citation

  • Samar Elkhalifa & Sabah Mariyam & Hamish R. Mackey & Tareq Al-Ansari & Gordon McKay & Prakash Parthasarathy, 2022. "Pyrolysis Valorization of Vegetable Wastes: Thermal, Kinetic, Thermodynamics, and Pyrogas Analyses," Energies, MDPI, vol. 15(17), pages 1-17, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6277-:d:900158
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    References listed on IDEAS

    as
    1. Alherbawi, Mohammad & Parthasarathy, Prakash & Al-Ansari, Tareq & Mackey, Hamish R. & McKay, Gordon, 2021. "Potential of drop-in biofuel production from camel manure by hydrothermal liquefaction and biocrude upgrading: A Qatar case study," Energy, Elsevier, vol. 232(C).
    2. Małgorzata Sieradzka & Cezary Kirczuk & Izabela Kalemba-Rec & Agata Mlonka-Mędrala & Aneta Magdziarz, 2022. "Pyrolysis of Biomass Wastes into Carbon Materials," Energies, MDPI, vol. 15(5), pages 1-12, March.
    3. Shahbaz, Muhammad & Al-Ansari, Tareq & Inayat, Muddasser & Sulaiman, Shaharin A. & Parthasarathy, Prakash & McKay, Gordon, 2020. "A critical review on the influence of process parameters in catalytic co-gasification: Current performance and challenges for a future prospectus," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).
    4. Artur Bieniek & Wojciech Jerzak & Małgorzata Sieradzka & Łukasz Mika & Karol Sztekler & Aneta Magdziarz, 2022. "Intermediate Pyrolysis of Brewer’s Spent Grain: Impact of Gas Atmosphere," Energies, MDPI, vol. 15(7), pages 1-17, March.
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    Cited by:

    1. Xiangxi Wang & Zhenzhong Hu & Inamullah Mian & Omar D. Dacres & Jian Li & Bo Wei & Mei Zhong & Xian Li & Noor Rahman & Guangqian Luo & Hong Yao, 2022. "Gasification Kinetics of Organic Solid Waste Pellets: Comparative Study Using Distributed Activation Energy Model and Coats–Redfern Method," Energies, MDPI, vol. 15(24), pages 1-12, December.
    2. Bartłomiej Igliński & Wojciech Kujawski & Urszula Kiełkowska, 2023. "Pyrolysis of Waste Biomass: Technical and Process Achievements, and Future Development—A Review," Energies, MDPI, vol. 16(4), pages 1-26, February.

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