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Medical Peat Waste Upcycling to Carbonized Solid Fuel in the Torrefaction Process

Author

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  • Kacper Świechowski

    (Department of Applied Bioeconomy, Wrocław University of Environmental and Life Sciences, 37a Chełmońskiego Str., 51-630 Wrocław, Poland)

  • Małgorzata Leśniak

    (Department of Applied Bioeconomy, Wrocław University of Environmental and Life Sciences, 37a Chełmońskiego Str., 51-630 Wrocław, Poland)

  • Andrzej Białowiec

    (Department of Applied Bioeconomy, Wrocław University of Environmental and Life Sciences, 37a Chełmońskiego Str., 51-630 Wrocław, Poland)

Abstract

Peat is the main type of peloid used in Polish cosmetic/healing spa facilities. Depending on treatment and origin, peat waste can be contaminated microbiologically, and as a result, it must be incinerated in medical waste incineration plants without energy recovery (local law). Such a situation leads to peat waste management costs increase. Therefore, in this work, we checked the possibility of peat waste upcycling to carbonized solid fuel (CSF) using torrefaction. Torrefaction is a thermal treatment process that removes microbiological contamination and improves the fuel properties of peat waste. In this work, the torrefaction conditions (temperature and time) on CSF quality were tested. Parallelly, peat decomposition kinetics using TGA and torrefaction kinetics with lifetime prediction using macro-TGA were determined. Furthermore, torrefaction theoretical mass and energy balance were determined. The results were compared with reference material (wood), and as a result, obtained data can be used to adjust currently used wood torrefaction technologies for peat torrefaction. The results show that torrefaction improves the high heating value of peat waste from 19.0 to 21.3 MJ × kg −1 , peat main decomposition takes place at 200–550 °C following second reaction order ( n = 2), with an activation energy of 33.34 kJ × mol −1 , and pre-exponential factor of 4.40 × 10 −1 s −1 . Moreover, differential scanning calorimetry analysis revealed that peat torrefaction required slightly more energy than wood torrefaction, and macro-TGA showed that peat torrefaction has lower torrefaction constant reaction rates (k) than wood 1.05 × 10 −5 –3.15 × 10 −5 vs. 1.43 × 10 −5 –7.25 × 10 −5 s −1 .

Suggested Citation

  • Kacper Świechowski & Małgorzata Leśniak & Andrzej Białowiec, 2021. "Medical Peat Waste Upcycling to Carbonized Solid Fuel in the Torrefaction Process," Energies, MDPI, vol. 14(19), pages 1-20, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:19:p:6053-:d:641113
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    References listed on IDEAS

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    1. Georgios Giakoumakis & Dorothea Politi & Dimitrios Sidiras, 2021. "Medical Waste Treatment Technologies for Energy, Fuels, and Materials Production: A Review," Energies, MDPI, vol. 14(23), pages 1-30, December.

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