✦ LIBER ✦

Study of the kinetics of sewage sludge pyrolysis using DSC and TGA

✍ Scribed by David L. Urban; Michael J. Antal Jr.

Publisher: Elsevier Science
Year: 1982
Tongue: English
Weight: 984 KB
Volume: 61
Category: Article
ISSN: 0016-2361
DOI: 10.1016/0016-2361(82)90306-4

No coin nor oath required. For personal study only.

✦ Synopsis

Thermogravimetry and differential scanning calorimetry were used to examine, in nitrogen, four sewage sludges at modest heating rates. A mechanism consisting of two independent reactions was derived for an undigested sludge. The parameters are: n, = IO, Et = 130 kJ mol-', AI = 1 x IO'* S-', nz= 15, E,=250 kJ mol-', AZ=1 x 10z5 S-', with initial weight fractions of wl=0.20, wz=O.43, the remainder being non-reactive ash. Analysis was performed by comparing Friedman multipleheatingrate analyses of experimental and model curves in an iterative manner. DSC experiments provide an understanding of the pyrolytic reaction mechanism and heat transfer in the thermogravimetric analyser. DSC analysis of sewage sludge was sensitive to decomposition reactions of small quantities of organic salts in the sludge. Sewage sludge could be a profitable pyrolysis feedstock if mixed with municipal solid waste.

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