Pyrolysis of pre-dried dewatered sewage sludge under different heating rates

Characteristics and kinetics study

Journal article (2019)

Authors

X. Zhu Sanitary Engineering - CEG , Shanghai Polytechnic University
L Zhao Shanghai Polytechnic University
Fengying Fu Shanghai Polytechnic University
Z Yang Shanghai Polytechnic University
Fan Li Shanghai Polytechnic University
W. Yuan Shanghai Polytechnic University
Mingyuan Zhou Shanghai Polytechnic University
Wei Fang Chinese Academy of Sciences
X. Zhang Sanitary Engineering - CEG
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Research Group
Sanitary Engineering (CEG) (TU Delft)
Tubular reactor Heating rate Pre-dried dewatered sewage sludge TG-DSC-FTIR
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Published Date

2019

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Water Management

Research Group

Sanitary Engineering

Abstract

The pyrolysis characteristics and kinetics of pre-dried dewatered sewage sludge under different heating rates (10, 20, and 30 °C/min) were investigated by thermogravimetric analyzer-fourier transform infrared analysis (TG-FTIR) and differential scanning calorimetry (DSC), and a heated tubular reactor. The thermal analysis results showed that four weight loss zones (<165, 165–400, 400–600, and >600 °C) were observed in TG curve, and a higher heating rate led to the increase of the maximum devolatilization rate and the higher temperature corresponding to the peak. The activation energy of different heating rate (10, 20, and 30 °C/min) was 70.0, 60.6 and 65.0 kJ/mol, respectively. The FTIR analysis of gaseous products indicated the concentrations of CO2 and CO increased steadily with the increased heating rate, while the concentration of CH4 first increased then decreased. Moreover, the yield of gaseous products and bio-oil increased with the increasing of the heating rate. Finally, the surface structure of chars and the chemical properties of bio-oil obtained were characterized using nitrogen adsorption, scanning electron microscopy, elemental analysis and gas chromatography–mass spectrometry. Overall, the results highlighted that pre-dried dewatered sewage sludge can be effectively converted into biofuel and porous material.