Thermochemical Conversion of Sewage Sludge by TGA-FTIR Analysis: Influence of Mineral Matter Added

Thermal treatments, such as combustion, gasification, and pyrolysis, have been proven to be a convenient alternative to conventional sludge disposal technologies. Today, process development implies scaling up and so improving the reactor's design. In continuously operated reactors, fresh sewage...

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Bibliographic Details
Published in:Drying technology 2015-08, Vol.33 (11), p.1318-1326
Main Authors: Hernandez, A.-B, Ferrasse, J.-H, Akkache, S, Roche, N
Format: Article
Language:English
Subjects:
air
Chemical and Process Engineering
Chemical reactions
Combustion
Engineering Sciences
Experiments
Fourier transform infrared spectroscopy
Gasification
heat treatment
Mineral matter
Pyrolysis
Scientific imaging
sewage sludge
Sludge
temperature
Thermogravimetric analysis
thermogravimetry
Waste disposal
Waste reactivity
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Summary:Thermal treatments, such as combustion, gasification, and pyrolysis, have been proven to be a convenient alternative to conventional sludge disposal technologies. Today, process development implies scaling up and so improving the reactor's design. In continuously operated reactors, fresh sewage sludge is in contact with solid residues (reacted material rich in mineral matter and char). Mineral matter has been reported to catalyze the thermo-chemical reactions involved but few works focus on this aspect. In this work, sewage sludge residues were added to fresh sewage sludge. Non-isothermal thermo-gravimetric analysis (TGA) coupled with infrared spectrometry (FTIR) showed that added residues reduce the characteristic reaction temperatures during char combustion and gasification (air, air-N ₂, and CO ₂ atmospheres). However, any considerable influence of residues was observed during pyrolysis experiments (N ₂ atmosphere). The analysis of gas produced during those experiments revealed further details about the solid decomposition, showing considerable differences between different atmospheres.
ISSN:1532-2300
0737-3937
1532-2300
DOI:10.1080/07373937.2015.1036283