Fujimori Takashi, Takaoka Masaki, Takeda Nobuo
Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyoto University, Katsura, Nisikyo-ku, 615-8540, Kyoto, Japan.
Environ Sci Technol. 2009 Nov 1;43(21):8053-9. doi: 10.1021/es901842n.
Model fly ashes containing admixed Cu, Fe, Pb, and Zn chlorides and oxides were heated at a temperature corresponding to the postcombustion zone of a municipal solid waste incinerator (MSWI), resulting in the formation of chlorinated aromatic compounds, including polychlorinated dibenzo-p-dioxins (PCDDs) and furans (PCDFs), polychlorinated biphenyls (PCBs), and chlorobenzenes (CBzs). The concentrations of these compounds were measured and compared with those occurring in real fly ash. The order with respect generative capacity of each metal additive was calculated from principal component analysis of the concentrations of the different chlorinated aromatic compounds as CuCl(2)*2H(2)O > Cu(2)(OH)(3)Cl > FeCl(3)*6H(2)O > FeCl(2)*4H(2)O > CuO > Fe(2)O(3) > PbCl(2) > blank (no metal added) > ZnCl(2) > PbO > ZnO. From hierarchical cluster analysis of the concentrations and congener distribution patterns of the PCDDs, PCDFs, PCBs, and CBzs, the metallic compounds were divided into five groups: Group A (CuCl(2)*2H(2)O and Cu(2)(OH)(3)Cl), B (FeCl(3)*6H(2)O and FeCl(2)*4H(2)O), C (CuO and PbCl(2)), D (Fe(2)O(3), blank, and ZnCl(2)), and E (PbO and ZnO). Cluster analysis showed the congener distribution patterns of model fly ashes to be similar to the pattern of real MSWI fly ash. The formation of PCDDs was influenced mainly by group B, blank, and PbO; PCDFs, mainly by CuO, Fe(2)O(3) and ZnCl(2); PCBs, mainly by groups B and C; and CBzs, mainly by groups A and B. Thus, the multiple promotion of chlorinated aromatic compound formation by metallic chlorides and oxides in the fly ashes of MSWIs and other thermal processes has considerable importance for the environment.
含有混合氯化铜、氯化铁、氯化铅和氯化锌以及氧化物的模拟飞灰在相当于城市固体废物焚烧炉（MSWI）燃烧后区域的温度下加热，导致形成了氯化芳香族化合物，包括多氯代二苯并 - 对 - 二噁英（PCDDs）和呋喃（PCDFs）、多氯联苯（PCBs）以及氯苯（CBzs）。测量了这些化合物的浓度，并与实际飞灰中的浓度进行了比较。通过对不同氯化芳香族化合物浓度的主成分分析计算出每种金属添加剂的生成能力顺序为：CuCl₂·2H₂O > Cu₂(OH)₃Cl > FeCl₃·6H₂O > FeCl₂·4H₂O > CuO > Fe₂O₃ > PbCl₂ > 空白（未添加金属）> ZnCl₂ > PbO > ZnO。根据PCDDs、PCDFs、PCBs和CBzs的浓度及同系物分布模式的层次聚类分析，金属化合物被分为五组：A组（CuCl₂·2H₂O和Cu₂(OH)₃Cl）、B组（FeCl₃·6H₂O和FeCl₂·4H₂O）、C组（CuO和PbCl₂）、D组（Fe₂O₃、空白和ZnCl₂）以及E组（PbO和ZnO）。聚类分析表明模拟飞灰的同系物分布模式与实际MSWI飞灰的模式相似。PCDDs的形成主要受B组、空白和PbO影响；PCDFs主要受CuO、Fe₂O₃和ZnCl₂影响；PCBs主要受B组和C组影响；CBzs主要受A组和B组影响。因此，城市固体废物焚烧炉及其他热过程飞灰中金属氯化物和氧化物对氯化芳香族化合物形成的多重促进作用对环境具有相当重要的意义。
