Investigation of Pyrolysis Behavior of Sewage Sludge by Thermogravimetric Analysis Coupled with Fourier Transform Infrared Spectrometry Using Different Heating Rates

Miskolczi, Norbert; Tomasek, Szabina

doi:10.3390/en15145116

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…In Table 3, the results indicate that the activation energy of pure SS is higher than that of pure PP, which is obviously different from the results obtained by the Coats-Redfern method. Miskolczi et al also found that the activation energies for pyrolysis processes varied widely in the cases of municipal sewage sludge or distillery sludge [45]. However, SS and PP also exhibit obvious positive synergy in the activation energy for the FWO method.…”

Section: Activation Energymentioning

confidence: 98%

A Study of Copyrolysis Characteristics of Sewage Sludge and Waste Polypropylene

Chen

Huang

2023

International Journal of Energy Research

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This study investigates the copyrolysis of sewage sludge (SS) and waste polypropylene (PP). SS exhibited low heating value and high ash content, whereas PP had a high heating value and volatile content. The properties of SS and PP were analyzed, and copyrolysis process, activation energy, synergistic effects, and gas yield were investigated using thermogravimetry combined with Fourier-transform infrared spectroscopy. The results showed the existence of a three-stage synergy, and 10 % PP + 90 % SS showed maximum aromatic yield. The activation energy value for the blended fuel exhibited positive synergy. The Taguchi method was used to determine the operating conditions in a high-temperature furnace for the maximum C5–12/C19+ ratio and optimal pyrolysis oil quality. The PP : SS ratio was the most influencing parameter, followed by the pyrolysis temperature. 30% PP and 10% PP had the best C5–12/C19+ ratio and pyrolysis oil quality, respectively. We obtained a maximum C5–12/C19+ ratio of 9.1 and the optimal ratio of petrochemical product components ( alkenes + monoaromatics ) to worthless products ( polyaromatics + cyclic compounds ) of 4.02. The optimal experimental parameters to achieve these two targets were operated with 10% HZSM-5 and activated alumina. HZSM-5 improved the heating value, oil yield, carbon-number ratio, and pyrolysis oil quality.

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Section: Activation Energymentioning

confidence: 98%

A Study of Copyrolysis Characteristics of Sewage Sludge and Waste Polypropylene

Chen

Huang

2023

International Journal of Energy Research

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“…This can be explained by the difficulty in accurately measuring the temperature of the sample due to the increase in the temperature gradient between the surface and the interior of the solid, noting that the temperature gradient increases with the heating rate, resulting in the shift of the curves towards the high temperature region [35]. Also, when the sample undergoes chemical reactions in a temperature region, the reaction depends strongly on the heating rate, therefore, the higher the heating rate the more the reactions move to higher temperatures [45].…”

Section: Tg-dtg Tg-ms and Dsc Analysismentioning

confidence: 99%

Physicochemical Characterization, Thermal Behavior, and Pyrolysis Kinetics of Sewage Sludge

Messaoudi,

Koukouch,

Bakhattar

et al. 2024

Energies

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Pyrolysis is an energy recovery technique with significant potential for managing wastewater treatment plant byproducts. This research aims to investigate the physicochemical and thermal properties of Moroccan sludge, as well as the behavior of its decomposition during pyrolysis at three different heating speeds (5, 10, and 20 K/min). Characterization of the sludge before pyrolysis through ultimate analysis, proximate analysis, FTIR spectroscopy, and XRD revealed that the sludge consists predominantly of organic matter, with a volatile matter rate of 48%, an ash rate of 37%, and a higher heating value (HHV) of 15 MJ/kg. The TGA-DTG curves identified four distinct stages in the sludge decomposition process: drying, decomposition of organic matter, degradation of calcium carbonate, and decomposition of inorganic matter. Using TG-MS analysis, the principal gases identified during pyrolysis were H2O, H2, CH4, CO2, CO, NO, and SO. The average activation energies (Ea) determined through kinetics models were found to be 413.4 kJ/mol for the Kissinger–Akahira–Sunose (KAS) model, 419.6 kJ/mol for the Flynn–Wall–Ozawa (FWO) model, and 416.3 kJ/mol for the Starink model. The values of Ea and the pre-exponential coefficient (A) obtained through the KAS, FWO, and Starink techniques are consistent with ΔG values ranging between 152 and 155 KJ/mol. The positive ΔS values range from 0.003 to 1.415 kJ/mol.K, indicating the complexity of the sludge response during pyrolysis and the spontaneity of the chemical reaction at high temperatures. The kinetic data obtained serves as a pillar for the development and improvement of sewage sludge pyrolysis systems, reinforcing their role in sustainable energy production.

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“…Malgorzata et al [23] used the TG-FTIR method to compare the gas products of pyrolysis and combustion, confirming that the pyrolysis process was divided into four stages, compared to the five stages of combustion. Norbert et al [24] explored the thermal decomposition behavior of sewage sludge using TG-FTIR experiments. Zhang et al [25] focused on an organic fireproof plugging material and studied the complex pyrolysis characteristics and gas evolution through TG-FTIR analysis, proposing that pyrolysis in nitrogen might be divided into four stages.…”

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition Process of Fireproof Sealant Measured with Thermogravimetric and Fourier Transform Infrared Spectroscopy Analysis and Estimated Using Shuffled Complex Evolution

Liu,

Xu,

Zhang

et al. 2024

Fire

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Fireproof sealing technology is widely used in industrial, commercial, and other public buildings, so the performance of fireproof sealing materials in high temperatures or fire environments must be taken into account as an important factor. Fireproof sealant is considered to be a highly effective adhesive for sealing and fireproofing purposes. To explore its thermal decomposition mechanism and estimate its pyrolysis behaviors, a series of thermogravimetric experiments from 10 K/min to 60 K/min coupled with Fourier transform infrared spectroscopy analysis technology were performed. The results indicated that the thermal decomposition of the fireproof sealant could be divided into three reactions: the degradation of ammonium polyphosphate, melamine, and acrylic acid. In addition, the pyrolysis behavior of the fireproof sealant was compared under two kinds of atmosphere (nitrogen and air). Furthermore, the initial kinetic parameters in the nitrogen atmosphere were calculated based on model-free methods including the Friedman, KAS, and Starink methods. The average activation energy of three reactions obtained by the three methods was 108.32 kJ/mol, 200.46 kJ/mol, and 177.10 kJ/mol, respectively, while these obtained parameters were hard to regenerate, the thermogravimetric curves were accurately based on the established pyrolysis reaction scheme, with the existence of clear deviations. Therefore, a global heuristic optimization algorithm, Shuffled Complex Evolution (SCE), was selected to optimize 14 parameters (including activation energies and the pre-exponential factors) and the optimized pyrolysis results agreed well with the experimental data, even at the extra heating rate, with the correlation coefficient for the mass loss and mass loss rate being reaching up to 0.9943 and 0.9019, respectively. The study indicated that the SCE algorithm showed an appropriate potential to estimate the pyrolysis behavior of an unknown thermogravimetric experiment group.

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Investigation of Pyrolysis Behavior of Sewage Sludge by Thermogravimetric Analysis Coupled with Fourier Transform Infrared Spectrometry Using Different Heating Rates

Cited by 8 publications

References 38 publications

A Study of Copyrolysis Characteristics of Sewage Sludge and Waste Polypropylene

A Study of Copyrolysis Characteristics of Sewage Sludge and Waste Polypropylene

Physicochemical Characterization, Thermal Behavior, and Pyrolysis Kinetics of Sewage Sludge

Thermal Decomposition Process of Fireproof Sealant Measured with Thermogravimetric and Fourier Transform Infrared Spectroscopy Analysis and Estimated Using Shuffled Complex Evolution

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