Composting of urban solid residues (USR) by different dispositions - Kinetics of thermal decomposition
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Data
2003-01-01
Autores
Crespi, Marisa Spirandeli [UNESP]
Silva, A. R.
Ribeiro, Clovis Augusto [UNESP]
Oliveira, S. C.
Santiago-Silva, M. R.
Título da Revista
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Editor
Kluwer Academic Publ
Resumo
The thermal behavior and non-isothermal kinetics of thermal decomposition of three different kinds of composting of the USR like: stack with drilled PVC tubes (ST), revolved stack (SR) and stack with material of structure (SM), from the usine of composing of Araraquara city, São Paulo state, Brazil, within a period of 132 days of composting were studied.Results from TG, DTG and DSC curves obtained on inert atmosphere indicated that the cellulosic fraction present, despite the slow degradation during the composting process, is thermally less stable than other substances originated from that process. Due to that behavior, the cellulosic fraction decomposition could be kinetically evaluated through non-isothermal methods of analysis.The values obtained were: average activation energy, E-a=248, 257 and 259 kJ mol(-1) and pre-exponential factor, logA=21.4, 22.5, 22.7 min(-1), to the ST, SR and SM, respectively.From E-a and logA values and DSC curves, Malek procedure could be applied, suggesting that the SB (Sestak-Berggren) kinetic model is the appropriated one to the first thermal decomposition step.
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Palavras-chave
composting, kinetic parameters, thermal behavior, urban solid residues
Como citar
Journal of Thermal Analysis and Calorimetry. Dordrecht: Kluwer Academic Publ, v. 72, n. 3, p. 1049-1056, 2003.