Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method

Salman Raza Naqvi, Rumaisa Tariq, Zeeshan Hameed, Imtiaz Ali, Muhammad Naqvi, Wei-Hsin Chen, Selim Ceylan, Harith Rashid, Junaid Ahmad, Syed A. Taqvi, Muhammad Shahbaz

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Abstract

This study aims to investigate the thermo-kinetics of high-ash sewage sludge using thermogravimetric analysis. Sewage sludge was dried, pulverized and heated non-isothermally from 25 to 800 °C at different heating rates (5, 10 and 20 °C/min) in N2 atmosphere. TG and DTG results indicate that the sewage sludge pyrolysis may be divided into three stages. Coats-Redfern integral method was applied in the 2nd and 3rd stage to estimate the activation energy and pre-exponential factor from mass loss data using five major reaction mechanisms. The low-temperature stable components (LTSC) of the sewage sludge degraded in the temperature regime of 250–450 °C while high-temperature stable components (HTSC) decomposed in the temperature range of 450–700 °C. According to the results, first-order reaction model (F1) showed higher Ea with better R2 for all heating rates. D3, N1, and S1 produced higher Ea at higher heating rates for LTSC pyrolysis and lower Ea with the increase of heating rates for HTSC pyrolysis. All models showed positive ΔH except F1.5. Among all models, Diffusion (D1, D2, D3) and phase interfacial models (S1, S2) showed higher ΔG as compared to reaction, nucleation, and power-law models in section I and section II.

Original languageEnglish
Pages (from-to)854-860
Number of pages7
JournalRenewable Energy
Volume131
DOIs
Publication statusPublished - 2019 Feb 1

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Ashes
Sewage sludge
Pyrolysis
Thermodynamics
Heating rate
Kinetics
Temperature
Thermogravimetric analysis
Nucleation
Activation energy

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment

Cite this

Naqvi, Salman Raza ; Tariq, Rumaisa ; Hameed, Zeeshan ; Ali, Imtiaz ; Naqvi, Muhammad ; Chen, Wei-Hsin ; Ceylan, Selim ; Rashid, Harith ; Ahmad, Junaid ; Taqvi, Syed A. ; Shahbaz, Muhammad. / Pyrolysis of high ash sewage sludge : Kinetics and thermodynamic analysis using Coats-Redfern method. In: Renewable Energy. 2019 ; Vol. 131. pp. 854-860.
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Naqvi, SR, Tariq, R, Hameed, Z, Ali, I, Naqvi, M, Chen, W-H, Ceylan, S, Rashid, H, Ahmad, J, Taqvi, SA & Shahbaz, M 2019, 'Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method', Renewable Energy, vol. 131, pp. 854-860. https://doi.org/10.1016/j.renene.2018.07.094

Pyrolysis of high ash sewage sludge : Kinetics and thermodynamic analysis using Coats-Redfern method. / Naqvi, Salman Raza; Tariq, Rumaisa; Hameed, Zeeshan; Ali, Imtiaz; Naqvi, Muhammad; Chen, Wei-Hsin; Ceylan, Selim; Rashid, Harith; Ahmad, Junaid; Taqvi, Syed A.; Shahbaz, Muhammad.

In: Renewable Energy, Vol. 131, 01.02.2019, p. 854-860.

Research output: Contribution to journalArticle

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T1 - Pyrolysis of high ash sewage sludge

T2 - Kinetics and thermodynamic analysis using Coats-Redfern method

AU - Naqvi, Salman Raza

AU - Tariq, Rumaisa

AU - Hameed, Zeeshan

AU - Ali, Imtiaz

AU - Naqvi, Muhammad

AU - Chen, Wei-Hsin

AU - Ceylan, Selim

AU - Rashid, Harith

AU - Ahmad, Junaid

AU - Taqvi, Syed A.

AU - Shahbaz, Muhammad

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AB - This study aims to investigate the thermo-kinetics of high-ash sewage sludge using thermogravimetric analysis. Sewage sludge was dried, pulverized and heated non-isothermally from 25 to 800 °C at different heating rates (5, 10 and 20 °C/min) in N2 atmosphere. TG and DTG results indicate that the sewage sludge pyrolysis may be divided into three stages. Coats-Redfern integral method was applied in the 2nd and 3rd stage to estimate the activation energy and pre-exponential factor from mass loss data using five major reaction mechanisms. The low-temperature stable components (LTSC) of the sewage sludge degraded in the temperature regime of 250–450 °C while high-temperature stable components (HTSC) decomposed in the temperature range of 450–700 °C. According to the results, first-order reaction model (F1) showed higher Ea with better R2 for all heating rates. D3, N1, and S1 produced higher Ea at higher heating rates for LTSC pyrolysis and lower Ea with the increase of heating rates for HTSC pyrolysis. All models showed positive ΔH except F1.5. Among all models, Diffusion (D1, D2, D3) and phase interfacial models (S1, S2) showed higher ΔG as compared to reaction, nucleation, and power-law models in section I and section II.

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