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Brazilian Journal of Chemical Engineering

Print version ISSN 0104-6632On-line version ISSN 1678-4383

Abstract

ARLABOSSE, P.; CHAVEZ, S.  and  PREVOT, C.. Drying of municipal sewage sludge: from a laboratory scale batch indirect dryer to the paddle dryer. Braz. J. Chem. Eng. [online]. 2005, vol.22, n.2, pp.227-232. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322005000200009.

Among available technologies, disk and paddle dryers are often encountered in France to process municipal sewage sludge but their thermal design is still a question of know how rather than scientific knowledge. From experiments performed on an industrial Naratherm® paddle dryer and the literature, a simple model has been developed. The dryer is divided into two parts depending on the sludge consistency. A constant evaporating flow rate is assumed in the pasty zone whereas its linear decrease with the moisture content is taken into account in the granular zone. To compute this model, some of the sludge properties have to be characterized with a set of laboratory scale experimental techniques. The agreement with the experimental data is good.

Keywords : Contact drying; Drying kinetic; Model; Experiment.

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