PCB decomposition and formation in thermal treatment plant equipment
PCB decomposition and formation in thermal treatment plant equipment
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DOI：
10.1016/j.chemosphere.2006.10.022
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发表时间：
2007-04-01
期刊：
影响因子：
8.8
通讯作者：
Sakai, Shin-ichi
中科院分区：
文献类型：
--
作者：
Ishikawa, Yukari;Noma, Yukio;Sakai, Shin-ichi
在这项研究中，我们研究了垃圾衍生燃料（RDF）和汽车粉碎残渣（ASR）在由主燃烧室、二级燃烧室和其他烟气处理设备组成的热处理厂设备中的多个阶段的燃烧实验中多氯联苯同系物的分解和无意形成。在这两个实验中，在输入样品中 PCB 分解的同时，主燃烧室中也无意中形成了 PCB。通过燃烧 RDF，主要形成非邻位 PCB，而邻位 PCB 和对称氯化联苯（例如 #52/69、#87/108 和 #151）往往会分解。 ASR 比 RDF 形成更多的氯化联苯。 ASR 的这些副产物与邻氯没有结构关系。低氯化联苯在最终出口处以主要同系物形式出现，而从低氯化PCB到高氯化PCB的所有同系物都是在主燃烧室中无意形成的副产物。结果表明，烟气处理设备有效去除了高氯化PCB。 RDF 的输入标记同系物为 # 11、#39 和 #68，而 ASR 的输入标记同系物为 #11、# 101、#110/120 和 #118。除此之外，RDF 的燃烧标记同系物为 #13/12、#35、#77 和 #126，而 ASR 的燃烧标记同系物为 #170、#194、#206 和 #209。在一次燃烧室中PCB浓度显着升高的同时，在二次燃烧室和烟气处理设备中二恶英类PCB的毒性当量值却下降。 (c) 2006 Elsevier Ltd. 保留所有权利。
In this study we investigated both the decomposition and unintentional formation of polychlorinated biphenyl congeners during combustion experiments of refuse-derived fuel (RDF) and automobile shredder residue (ASR) at several stages in thermal treatment plant equipment composed of a primary combustion chamber, a secondary combustion chamber, and other equipments for flue gas treatment. In both experiments, the unintentional formation of PCB occurred in the primary combustion chamber at the same time as the decomposition of PCB in input samples. By combusting RDF, non-ortho-PCB predominantly formed, whereas ortho-PCB and symmetric chlorinated biphenyls (e.g., #52/69, #87/108, and #151) tended to be decomposed. ASR formed the higher chlorinated biphenyls more than RDF. These by-products from ASR had no structural relation with ortho-chlorine. Lower chlorinated biphenyls appeared as predominant homologues at the final exit site, while all congeners from lower to higher chlorinated PCB were unintentionally formed as by-products in the primary combustion chamber. This result showed that the flue gas treatment equipments effectively removed higher chlorinated PCB. Input marker congeners of RDF were # 11, #39, and #68, while those for ASR were #11, # 101, #110/120, and #118. Otherwise, combustion marker congeners of RDF were #13/12, #35, #77, and #126, while those for ASR were #170, #194, #206, and #209. While the concentration of PCB increased significantly in the primary combustion chamber, the value of toxicity equivalency quantity for dioxin-like PCB decreased in the secondary combustion chamber and the flue gas treatment equipments. (c) 2006 Elsevier Ltd. All rights reserved.