Study on Convective Drying Characteristics of Dredged Sludge from Dian Lake

Abstract

In this work, the thin layer drying behavior of dredged sludge from Dian Lake by convective drying methods was investigated. The results showed that the Modified Page-I model was more suitable for thin-layer drying of dredged sludge. The values of the diffusion coefficients at each temperature were obtained using Fick’s second law of diffusion, and it was varied from 6.472×10⁻⁹ to 1.143×10⁻⁸ m²/s when the temperature was changed from 100 to 160°C for the dredged sludge of 10 mm. When the thickness was changed from 5 to 20 mm, the diffusion coefficients were varied from 4.036×10⁻⁹ to 2.648×10⁻⁸ m²/s at 140°C. The activation energy of moisture diffusion was 13.1 kJ/mol.

Keywords:

• dredged sludge
• thin layer drying
• drying model
• effective diffusion coefficient
• activation energy

Additional information

Funding

This work was financially supported by NSFC (No: 21107080) and the Fund of Anhui Province Traffic Navigation Engineering Co. Ltd.