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- Title
A comparison of isothermal with nonisothermal drying kinetics of municipal sewage sludge.
- Authors
Zhang, X.; Chen, M.
- Abstract
Thermal drying behavior of the municipal sewage sludge in nitrogen atmosphere was explored using a thermal analysis technique under isothermal and nonisothermal drying conditions. The Midilli model, $$ {\text{MR}} = \exp ( - kt^{\text{n}} ) + bt $$ , was the best suitable for predicting both the isothermal and nonisothermal drying behavior of the sewage sludge with the highest R. The isothermal drying apparent activation energies of the first falling rate period and the second falling rate period were 18.03 and 11.87 kJ mol, respectively. The nonisothermal drying apparent activation energies of sewage sludge were from 33.61 to 47.37 kJ mol in the first falling rate period and from 20.47 to 33.43 kJ mol in the second falling rate period, respectively. In two falling rate periods, the dominant mechanism functions for the isothermal drying were identical, $$ - \ln (1 - \alpha ) $$ . The dominant mechanism functions for the first falling rate period and the second falling rate period in the nonisothermal drying were described by $$ [ - \ln (1 - \alpha )]^{1/2} $$ and $$ [ - \ln (1 - \alpha )]^{1/3} $$ , respectively.
- Subjects
ISOTHERMAL processes; SEWAGE sludge; CHEMICAL kinetics; THERMAL analysis; ACTIVATION (Chemistry); DRYING
- Publication
Journal of Thermal Analysis & Calorimetry, 2016, Vol 123, Issue 1, p665
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-015-4933-1