Poster

Drying sewage sludge with coal fly ash for producing a soil amendment

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The high quantities of sewage sludge (SS) and coal fly ash (CFA) produced require an adequate management for protecting human health and the environment. This study aims to investigate the possibility of using CFA as SS drying adjuvant for producing a soil amendment. The study involved the characterization of SS and CFA at a physical and chemical level. The drying process of small cylinders, for several combinations of SS:CFA (100:0-control; 95:5; 90:10 and 85:15) at different temperatures (40, 70, 100 and 130 ºC) was investigated. The dynamic model of the drying process was based on the Fick law and an infinite length was assumed for the small cylinders. The kinetics analysis showed that as the quantity of CFA increases the rate of drying is faster. The effective diffusion coefficient and other relevant parameters were determined for each thermal drying condition. The results showed that the drying process of SS with small quantities of CFA may be a route for valorizing these wastes in agricultural soil.
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