Species Transformation of Trace Elements and Their Distribution Prediction in Dyestuff Residue Incineration

• Published in: Chinese journal of chemical engineering 2007-03, Vol.15 (2), p.268-275
• Main Author: 谭中欣 李海滨 王小亮 蒋旭光 严建华
• Format: Article
• Language: English
• Subjects: 形态转化; 有害废物; 残留染料; 焚烧过程; 痕量元素; 重金属
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(07)60069-X

The release of heavy metals from the combustion of hazardous wastes is an environmental issue of increasing concern. The species transformation characteristics of toxic heavy metals and their distribution are considered to be a complex problem of mechanism. The behavior of hazardous dyestuff residue is investigated in a tubular furnace under the general condition of hazardous waste pyrolysis and gasfication. Data interpretation has been aided by parallel theoretical study based on a thermodynamic equilibrium model based on the principle of Gibbs free energy minimization. The results show that Ni, Zn, Mn, and Cr are more enriched in dyestuff residue incineration than other heavy metals （Hg, As, and Se） subjected to volatilization. The thermodynamic model calculation is used for explaining the experiment data at 800℃ and analyzing species transformation of heavy metals. These results of species transformation are used to predict the distribution and emission characteristics of trace elements. Although most trace element predictions are validated by the measurements, cautions are in order due to the complexity of incineration systems.