Study of sewage sludge pyrolysis mechanism and mathematical modeling

Citation
Xg. Chen et S. Jeyaseelan, Study of sewage sludge pyrolysis mechanism and mathematical modeling, J ENV ENG, 127(7), 2001, pp. 585-593
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology,"Environmental Engineering & Energy
Journal title
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE
ISSN journal
0733-9372 → ACNP
Volume
127
Issue
7
Year of publication
2001
Pages
585 - 593
Database
ISI
SICI code
0733-9372(200107)127:7<585:SOSSPM>2.0.ZU;2-F
Abstract
The pyrolysis of sewage sludge, with and without ZnCl2 activation, was moni tored using TGA-FTIR, with the results utilized in a proposed decomposition mechanism. For Ehe pyrolysis of sludge without ZnCl2 activation, three glo bal stages of mass loss occurred and are proposed as dehydration, initial d epolymerization, and deep degradation. For the pyrolysis of sludge with ZnC l2 activation, apart from these three stages, an additional mass loss stage could be also observed at high temperature. It is suggested this results f rom the evaporation of ZnCl2. To make a comparison between these two cases, it was found that the pyrolysis of sludge with ZnCl2 activation had a long er dehydration phase and a shorter degradation phase. Based on the speculat ed mechanism, a kinetic model of four consecutive competitive reactions was adopted to simulate the pyrolysis of sewage sludge with and without ZnCl2 activation. Globally, the proposed model was able to fit the experimental d ata very well for both cases, with the correlation coefficients above 0.99.