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., ...Daha Fazla

RENEWABLE ENERGY, cilt.131, ss.854-860, 2019 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 131
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.renene.2018.07.094
  • Dergi Adı: RENEWABLE ENERGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.854-860
  • Anahtar Kelimeler: Sewage sludge, Pyrolysis, Kinetics, Thermodynamic parameters, Thermogravimetric analysis, CO-PYROLYSIS, LIGNOCELLULOSIC BIOMASS, TEMPERATURE PYROLYSIS, THERMAL-DECOMPOSITION, HEAVY-METALS, WASTE, PARAMETERS, ENERGY, DEGRADATION, MANAGEMENT
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

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 degrees C at different heating rates (5, 10 and 20 C/min) in N-2 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 degrees C while high-temperature stable components (HTSC) decomposed in the temperature range of 450-700 degrees C. According to the results, first-order reaction model (F1) showed higher Ea with better R-2 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 Delta H except F1.5. Among all models, Diffusion (D1, D2, D3) and phase interfacial models (S1, S2) showed higher Delta G as compared to reaction, nucleation, and power-law models in section I and section II. (C) 2018 Elsevier Ltd. All rights reserved.