期刊
AEROSOL AND AIR QUALITY RESEARCH
卷 16, 期 7, 页码 1569-1578出版社
TAIWAN ASSOC AEROSOL RES-TAAR
DOI: 10.4209/aaqr.2016.01.0001
关键词
Hospital solid waste incinerator; Fly ash; Size distribution; Heavy metals; PCDD/Fs
资金
- National Natural Science Foundation of China [NSFC 51378332]
- Tianjin science and technology correspondent project [15JCTPJC63600]
Hospital solid waste incinerator (HSWI) fly ash is an extremely complex mixture because it contains carbon constituents, toxic heavy metals, and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). We investigated the distribution of carbon constituents, PCDD/Fs, and heavy metals in the five different particle size fractions (+106 mu m, -106 +75 mu m, -75 +38 mu m, -38 +25 mu m, and -25 mu m) of HSWI fly ash. The loss on ignition (LOI) in the particle size fraction of -25 mu m was higher than that in the particle size fractions of other sizes. Moreover, 82.63% of the fly ash particles were in the size range of -75 +25 mu m, and this particle size range was suitable for direct flotation treatment. Because powder-activated carbon adsorbed a higher amount of low-chlorinated PCDD/Fs in the gaseous phase, the concentration of each PCDD/F congener, particularly of low-chlorinated PCDD/Fs, generally increased with a decrease in the particle size. The total toxic equivalent (TEQ) of the fraction of -75 mu m did not satisfy the landfill site standard (3 ng-TEQ g(-1)). The highest concentration of Pb, Zn, and Cd was observed in the fraction of -38 +25 mu m rather than in the fraction of -25 mu m. The exchangeable speciation of Zn, Pb, and Cd was relatively high in the particle size fraction of -75 mu m. The carbonate speciation of Pb and Zn was the highest in the particle size fraction of -38 +25 mu m. The leaching concentrations of Pb and Cd in all particle size fractions exceeded landfill allowable thresholds.
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