Fate of polychlorinated dibenzo-p-dioxins and dibenzofurans in a fly ash treatment plant
Fate of polychlorinated dibenzo-p-dioxins and dibenzofurans in a fly ash treatment plant
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DOI：
10.3155/1047-3289.57.9.1024
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发表时间：
2007-09-01
影响因子：
2.7
通讯作者：
Chang-Chien, Guo-Ping
中科院分区：
文献类型：
--
作者：
Li, Hsing-Wang;Wu, Yee-Lin;Chang-Chien, Guo-Ping
为了了解多氯二苯并对二恶英和二苯并呋喃（PCDD/Fs）在使用Waelz回转窑工艺（以下简称Waelz工艺）的飞灰处理厂中的归宿，对输入和输出介质进行了采样。收集和分析。输入质量中最重要的PCDD/F源是电弧炉（EAF）飞灰，其平均PCDD/F含量为18.51 ng/g，占PCDD/F输入质量的99%以上，而焦炭、沙子和环境空气中的PCDD/F输入质量分数分别仅为0.04%、0.02%和0.00002%。对于Waelz工艺中的PCDD/F输出质量，主要的PCDD/F总含量为43.73和10.78 ng/g，分别在袋式除尘器和旋风除尘器灰中，约占69%和17%，而烟囱烟道气和炉渣中的PCDD/F总含量分别为14%和0.423%。Waelz工艺对高氯同系物具有脱氯机理，但对二恶英芳环的分解较为困难。因此，这导致了低氯化同系物的积累。总PCDD/F质量和总PCDD/F国际毒性当量（1-TEQ）的输出/输入比分别为0.62和1.19。因此，Waelz过程对多氯二苯并对二恶英/多氯二苯并呋喃总质量的消耗效应是积极的，但很小，而对多氯二苯并对二恶英/多氯二苯并呋喃总毒性当量的影响总体上是不利的。
To understand the fate of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in a fly ash treatment plant that used the Waelz rotary kiln process (hereafter the Waelz process), the samples of input and output media were. collected and analyzed. The most important PCDD/F source in input mass was electric arc furnace (EAF) fly ash, which had a mean PCDD/F content of 18.51 ng/g and contributed more than 99% of PCDD/F input mass, whereas the PCDD/F input mass fractions contributed by the coke, sand, and ambient air were only 0.04%, 0.02%, and 0.000002%, respectively. For the PCDD/F output mass in the Waelz process, the major total PCDD/F contents of 43.73 and 10.78 ng/g were in bag-filter and cyclone ashes, which accounted for approximately 69% and 17%, respectively, whereas those of stack flue gas and slag were 14% and 0.423%, respectively. The Waelz process has a dechlorination mechanism for higher chlorinated congeners, but it is difficult to decompose the aromatic rings of PCDD/Fs. Therefore, this resulted in the accumulation of lower chlorinated congeners. The output/input ratio of total PCDD/F mass and total PCDD/F international toxicity equivalence (1-TEQ) was 0.62 and 1.19, respectively. Thus, the Waelz process for the depletion effect of total PCDD/F mass was positive but minor, whereas the effect for total PCDD/F I-TEQ was adverse overall.