Pyrolytic kinetics of sludge from a petrochemical factory wastewater treatment plant--a transition state theory approach.

Abstract:

:The pyrolysis of hydrocarbon-rich sludge in an oxygen-free environment can provide useful liquefaction products and residues. When applied to sewage sludge, energy and time costs are the major factors that affect the operation. Therefore, it is important to understand how the process is affected by temperature. The pyrolysis kinetics of sludge from a petrochemical factory wastewater treatment plant was studied to reveal the effects of temperature on the reaction rate and the magnitude of deltaH and deltaS of the reaction barrier. Oven-dried sludge samples were pyrolyzed in an isothermal reactor under six different temperatures. The residues were weighed at frequent intervals within a total 30-min experiment period. Data analysis indicated that a first order reaction model could describe the pyrolysis kinetics, across all experimental temperature ranges. When transition state theory was applied, the results indicated that the major reaction barrier came from the entropy term of the activation free energy. Therefore, increasing the pyrolysis temperature to overcome the reaction barrier yielded no apparent improvement, but strategies that reduced the entropy should significantly improve the reaction.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Chao CG,Chiang HL,Chen CY

doi

10.1016/s0045-6535(02)00280-1

subject

Has Abstract

pub_date

2002-10-01 00:00:00

pages

431-7

issue

4

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(02)00280-1

journal_volume

49

pub_type

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