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

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 s...

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Main Authors: Naqvi, S.R., Tariq, R., Hameed, Z., Ali, I., Naqvi, M., Chen, W.-H., Ceylan, S., Rashid, H., Ahmad, J., Taqvi, S.A., Shahbaz, M.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.22170 /
Published: 2019
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053205748&doi=10.1016%2fj.renene.2018.07.094&partnerID=40&md5=c828f145d2b4e60886906023b759760f
http://eprints.utp.edu.my/22170/
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spelling utp-eprints.221702019-02-28T05:16:03Z Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method Naqvi, S.R. Tariq, R. Hameed, Z. Ali, I. Naqvi, M. Chen, W.-H. Ceylan, S. Rashid, H. Ahmad, J. Taqvi, S.A. Shahbaz, M. 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 �H except F1.5. Among all models, Diffusion (D1, D2, D3) and phase interfacial models (S1, S2) showed higher �G as compared to reaction, nucleation, and power-law models in section I and section II. © 2018 Elsevier Ltd 2019 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053205748&doi=10.1016%2fj.renene.2018.07.094&partnerID=40&md5=c828f145d2b4e60886906023b759760f Naqvi, S.R. and Tariq, R. and Hameed, Z. and Ali, I. and Naqvi, M. and Chen, W.-H. and Ceylan, S. and Rashid, H. and Ahmad, J. and Taqvi, S.A. and Shahbaz, M. (2019) Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method. Renewable Energy, 131 . pp. 854-860. http://eprints.utp.edu.my/22170/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description 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 �H except F1.5. Among all models, Diffusion (D1, D2, D3) and phase interfacial models (S1, S2) showed higher �G as compared to reaction, nucleation, and power-law models in section I and section II. © 2018 Elsevier Ltd
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author Naqvi, S.R.
Tariq, R.
Hameed, Z.
Ali, I.
Naqvi, M.
Chen, W.-H.
Ceylan, S.
Rashid, H.
Ahmad, J.
Taqvi, S.A.
Shahbaz, M.
spellingShingle Naqvi, S.R.
Tariq, R.
Hameed, Z.
Ali, I.
Naqvi, M.
Chen, W.-H.
Ceylan, S.
Rashid, H.
Ahmad, J.
Taqvi, S.A.
Shahbaz, M.
Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method
author_sort Naqvi, S.R.
title Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method
title_short Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method
title_full Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method
title_fullStr Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method
title_full_unstemmed Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method
title_sort pyrolysis of high ash sewage sludge: kinetics and thermodynamic analysis using coats-redfern method
publishDate 2019
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053205748&doi=10.1016%2fj.renene.2018.07.094&partnerID=40&md5=c828f145d2b4e60886906023b759760f
http://eprints.utp.edu.my/22170/
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score 11.62408

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