Hydrodynamics and mass transfer in a spouted bed dryer

M. H. El-Naas, S. Rognon, R. Legros, R. C. Mayer

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


The disposal of sludge generated by water treatment plants poses major financial and environmental problems. Drying of the sludge is an essential part of any disposal process which may include incinerating, landfilling or upgrading. In the present study, experiments were carried out to investigate the drying of sludge in a spouted bed and to characterize the hydrodynamics and mass transfer mechanisms. The effect of bed moisture content on the minimum spouting velocity (U(ms)) was examined for sludge granules. U(ms) was found to increase with increasing the moisture content of the sludge particles. The gas phase mass transfer coefficient in the dryer was determined using porous calcined alumina particles and the results were compared with predictions by correlations available in the literature. The existing correlations gave poor predictions for the mass transfer coefficient. A new correlation for the mass transfer coefficient in a spouted bed dryer was developed based on the experimental results.

Original languageEnglish
Pages (from-to)323-340
Number of pages18
JournalDrying Technology
Issue number1-2
Publication statusPublished - 2000
Externally publishedYes


  • Mass transfer coefficient
  • Minimum spouting velocity
  • Sludge
  • Spouted bed dryer

ASJC Scopus subject areas

  • General Chemical Engineering
  • Physical and Theoretical Chemistry


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