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摘要
A thorough examination has been undertaken for determining size dependent characterization of fly ash from municipal solid waste incinerators. The fly ash was segregated into five fractions and their size dependent characteristics, including particle size distribution, morphology, mineralogical and chemical composition, leaching behaviour of heavy metals of ash particles, levels of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans were analyzed and evaluated. The results revealed that various size particles of fly ash have different characteristic due to transportation and mixing system inside incinerators. Particle size distribution indicated that 72.2, 82.4 and 91.4 % of fly ash have lower than 75, 125 and 187.5 mu m, respectively. The leaching concentration of Pb in all fractions exceeded the regulatory level set by the China EPA. The leaching concentration of Cu, Zn and Pb of fly ashes with sized range 125-187 mu m was lower that that of the others, whereas Cr had the highest concentration compared with other samples. The concentration of higher-chlorinated congeners of dioxins were remarkably higher than those of lower-chlorinated congeners. The poison effect of dioxins in the fly ash was mainly caused by polychlorinated dibenzofurans. This investigation demonstrated that the characterization of municipal solid waste incinertor fly ash had the potential size dependent information of particulate materials in relation to their production processed, chemical compositions, environmental fates and other factors. The result was also provided the valuable information for incinerator desing and operation.
- 出版日期2013-6
- 单位环境保护部华南环境科学研究所
