不同垃圾焚烧炉产生的PCDD/Fs和PCBs同类物的分布

要应用高分辨气相色谱一质谱联用技术，测定了3种垃圾焚烧炉产生的飞灰中17种PCDD／Fs和12种共平面PCBs的浓度及毒性当量，比较了PCDD／Fs和PCBs同类物分布的差异．结果表明，流化床焚烧炉和炉排焚烧炉产生的PCDD／Fs多于PCBs，而气化熔融焚烧炉产生的PCBs多于PCDD／Fs；产生的PCBs对总毒性当量的贡献都比较小；3种焚烧炉产生的PCDD／Fs同类物具有相似的浓度分布；流化床焚烧炉和炉排焚烧炉产生的PCBs同类物具有相似的浓度分布，而气化熔融焚烧炉产生的PCBs同类物分布与其他两种焚烧炉差别较大．

PATTERNS OF PCDD/Fs AND PCBs CONGENERS FORMED FROM DIFFERENT TYPES OF MUNICIPAL WASTE INCINERATORS

Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) and polychlorinated biphenyls (PCBs) which were produced during the municipal waste incinerating processes mainly adsorbed on the fly ash. The concentrations and toxic equivalent(TEQ) values of 17 PCDD/Fs and 12 coplanar PCBs in fly ashes collected from three types of municipal waste incinerators (MWI) were determined, and the pattern differences of PCDD/Fs and PCBs congeners were compared. The results showed that the concentrations of PCDD/Fs were higher than those of PCBs which were produced by fluidized bed incinerator and stoker incinerator. But for gasified and melting incinerator, the concentrations of PCBs were higher than those of PCDD/Fs. In addition, the contributions to total TEQ values of PCBs from three kinds of incinerators were all lower than those of PCDD/Fs. The similar patterns of PCDD/Fs congeners among three types of incinerators were concluded. For the patterns of PCBs congneners, fluidized bed incinerator and stoker incinerator were similar, but the gasified and melting incinerator was different from them.