Abstract
The thin-layer drying behavior of municipal sewage sludge in a laboratory-scale hot-air-forced convective dryer was investigated in between 100 and 160 °C hot air temperatures and hot air velocities of 0.6, 1.4, and 2.0 m s−1. The thin-layer drying of sewage sludge presented a combination of a short warm-up period, and two distinguished falling rate periods. The Modified Page model was the best model to characterize the thin-layer drying of sewage sludge. The thin-layer drying kinetics was evaluated based on two falling rate stages. The effective moisture diffusivities of sewage sludge were from 1.87 × 10−9 to 6.18 × 10−9 m2 s−1 for the first falling rate period, and from 1.15 × 10−8 to 4.40 × 10−8 m2 s−1 for the second falling rate period. The average apparent activation energies of sewage sludge in the first falling rate period and the second falling rate period were 18.25 and 13.79 kJ mol−1.
Published Version
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