Thermal conversion behavior of paper mill sludge: characterization, kinetic, and thermodynamic analyses

Yaras A., DEMİREL B., AKKURT F., Arslanoglu H.

BIOMASS CONVERSION AND BIOREFINERY, vol.13, no.3, pp.2007-2016, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 13 Issue: 3
  • Publication Date: 2023
  • Doi Number: 10.1007/s13399-020-01232-9
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
  • Page Numbers: pp.2007-2016
  • Keywords: Paper mill sludge, Pyrolysis, Model-free kinetics, Thermogravimetric analysis, Thermodynamic parameters
  • Çanakkale Onsekiz Mart University Affiliated: Yes


The present paper reports the pyrolysis behavior, kinetic, and thermodynamic parameters of paper mill sludge (PMS), which is a paper manufacturing residue and cannot be re-evaluated, at three heating rates (5, 10, and 20 degrees C min(-1)) under non-isothermal conditions. Ultimate and proximate analyses of the paper mill sludge were carried out. Kinetic and thermodynamic parameters were calculated using four model-free methods; Flynn-Wall Ozawa (FWO), Friedman, Kissinger-Akahira-Sunose (KAS), and distributed activation energy model (DAEM). High R-2 values revealed that all models are compatible with TGA data. The activation energy calculated (101.01 kJ mol(-1)) from FWO was higher than the other three methods. Pre-exponential factor values ranged from 0.56 x 10(3) and 14.55 x 10(3) s(-1) for all methods. Kinetic and thermodynamic findings will be beneficial in terms of the process design of PMS pyrolysis.