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Abstract
Large-scale applications of sludge incineration, particularly with fluidized-bed incinerators, are extremely restricted in China at present by their high investment and operating costs. An innovative spray-drying-based sludge incineration (SDSI) process was proposed in our recent study, which has been applied in a full-scale sludge incineration plant with a capacity of 1200 tonnes/day (80% moisture). In the present research, behavior of selected heavy metals (Cu, Zn, Pb, Cd, As, Hg, Cr, and Ni) in this plant was investigated, aiming to provide further evidence about the SDSI performance. The results showed that concentrations of Cu, Zn, and Ni in the slag were higher than those in the fly ash after combustion. Nevertheless, concentrations of Pb, Cd, Hg, and As in the fly ash, particularly in the fine ash particles, were significantly higher than those in the slag. Unlike other heavy metals, the concentration of Cr in the slag was higher than that in coarse ash particles but roughly equal to that in fine a...
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