Drying Kinetics of Sludge from a Wastewater Treatment Plant |
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Authors: | A. Reyes M. Eckholt F. Troncoso G. Efremov |
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Affiliation: | a Chemical Engineering Department, USACH, Santiago, Chileb Department of Mathematical Modeling, Moscow State Open University, Moscow |
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Abstract: | Drying kinetics of sludge from a municipal sewage treatment plant were determined in a laboratory drying tunnel with parallel airflow at different temperatures and air velocities. The constant drying rate period was identified followed by two falling rate periods. Drying kinetics in these falling rate periods were then satisfactorily modeled using the modified quasi-stationary method and the Fick's second law. The two-period model was used, however, to describe drying kinetics over the entire drying process, and the equation for a generalized drying curve was proposed. The effective diffusivity was also determined from the integrated Fick's equation, and correlated with temperature by an Arrhenius type equation. |
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Keywords: | Biological sludge Drying kinetics Effective diffusivity Fick law Generalized drying curve Quasi-stationary method |
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