Co-Pyrolysis of Large-Scale Agricultural Waste as a Mixture of Digestate and Plant Residues: Thermogravimetric Decomposition, Kinetic and Thermodynamic Study, Characterization of Pyrolysis Products
- 1Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences, 420111 Kazan, Russia
- 2A.E. Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 420029 Kazan, Russia
Abstract
With the continuous increase in agricultural waste, its proper management has become a significant environmental and resource management challenge. This study analyzed the co-pyrolysis of digestate (D) from chicken manure biogas residues and sunflower husks (SH). The weight loss, kinetics during decomposition, and thermodynamic parameters of thermochemical conversion were characterized using a synchronous thermal analyzer. The experiments were conducted at heating rates of 5, 10, 20, and 30 °C/min. The average activation energies for the pyrolysis of D90&SH10, D50&SH50, and D10&SH90 mixtures were obtained using the Kissinger-Akahira-Sunose method and were 274.95 kJ/mol, 239.37 kJ/mol, and 245.09 kJ/mol, respectively. The average activation energies for the pyrolysis of D90&SH10, D50&SH50, and D10&SH90 mixtures were obtained using the Ozawa-Flynn-Wall method and were 367.32 kJ/mol, 321.23 kJ/mol, and 328.52 kJ/mol, respectively. The average activation energies for the pyrolysis of D90&SH10, D50&SH50, and D10&SH90 mixtures were obtained using the Friedman method and were 445.87 kJ/mol, 395.99 kJ/mol, and 358.29 kJ/mol, respectively. The results of thermodynamic analysis confirm favorable conditions for shifting co-pyrolysis reactions towards the formation of stable products; therefore, the process can be carried out in an energy-efficient method. The material balance of thermochemical conversion indicates the potential for producing solid and liquid materials. The results of this study provide valuable information on co-pyrolysis, which contributes to its implementation as an efficient and environmentally friendly waste management strategy.
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BibTeX
@article{timofeeva2026copyrolysis,
title = {{Co-Pyrolysis of Large-Scale Agricultural Waste as a Mixture of Digestate and Plant Residues: Thermogravimetric Decomposition, Kinetic and Thermodynamic Study, Characterization of Pyrolysis Products}},
author = {Svetlana Timofeeva and Julia Karaeva and Svetlana Islamova and Olga Sidorkina and Ayrat Khamatgalimov},
journal = {Molecules},
year = {2026},
month = oct,
doi = {10.3390/molecules31213863},
url = {https://www.mdpi.com/1420-3049/31/21/3863},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Co-Pyrolysis of Large-Scale Agricultural Waste as a Mixture of Digestate and Plant Residues: Thermogravimetric Decomposition, Kinetic and Thermodynamic Study, Characterization of Pyrolysis Products
AU - Svetlana Timofeeva
AU - Julia Karaeva
AU - Svetlana Islamova
AU - Olga Sidorkina
AU - Ayrat Khamatgalimov
PY - 2026
DA - 2026/10/26
JO - Molecules
DO - 10.3390/molecules31213863
UR - https://www.mdpi.com/1420-3049/31/21/3863
AB - With the continuous increase in agricultural waste, its proper management has become a significant environmental and resource management challenge. This study analyzed the co-pyrolysis of digestate (D) from chicken manure biogas residues and sunflower husks (SH). The weight loss, kinetics during decomposition, and thermodynamic parameters of thermochemical conversion were characterized using a synchronous thermal analyzer. The experiments were conducted at heating rates of 5, 10, 20, and 30 °C/min. The average activation energies for the pyrolysis of D90&SH10, D50&SH50, and D10&SH90 mixtures were obtained using the Kissinger-Akahira-Sunose method and were 274.95 kJ/mol, 239.37 kJ/mol, and 245.09 kJ/mol, respectively. The average activation energies for the pyrolysis of D90&SH10, D50&SH50, and D10&SH90 mixtures were obtained using the Ozawa-Flynn-Wall method and were 367.32 kJ/mol, 321.23 kJ/mol, and 328.52 kJ/mol, respectively. The average activation energies for the pyrolysis of D90&SH10, D50&SH50, and D10&SH90 mixtures were obtained using the Friedman method and were 445.87 kJ/mol, 395.99 kJ/mol, and 358.29 kJ/mol, respectively. The results of thermodynamic analysis confirm favorable conditions for shifting co-pyrolysis reactions towards the formation of stable products; therefore, the process can be carried out in an energy-efficient method. The material balance of thermochemical conversion indicates the potential for producing solid and liquid materials. The results of this study provide valuable information on co-pyrolysis, which contributes to its implementation as an efficient and environmentally friendly waste management strategy.
SN - 1420-3049
ER -