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Evaluation of Incremental Population and Individual Carcinogenic Risks of PCDD/Fs from Steel and Iron Industry in Taiwan by a Site-specific Health Risk Assessment Method

机译：特定地点健康风险评估方法评估台湾钢铁工业PCDD / Fs的增量种群和个体致癌风险

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摘要

Sinter plants and electric arc furnaces are the most important emission sources of PCDD/Fs. In order to understand the contribution and distribution of PCDD/Fs risk from steel and iron industry, the incremental health risk assessment of PCDD/Fs has been accomplished for the all sinter plants and electric arc furnaces in Taiwan. The study combined the multimedia, multiple pathway exposure modeling and site-specific exposure scenario to evaluate dioxin risks contributed from the 22 major companies of steel and iron industry including 4 sinter plants and 21 electric arc furnaces. The incremental cancer risks to the resident living in the 25 km × 25 km impact range of the above emission sources ranged from 3.10E-10 to 5.73E-06 under the site-specific exposure scenario. Among these 22 emission sources, the stacks with higher exit flows and worse operational characteristics would contribute higher inhalation risks; moreover, the sources located at the major agricultural districts in central Taiwan contributed higher ingestion risks. In conclusion, four sinter plants accounted for more than 24% of total PCDD/Fs exit rates in steel and iron industry, and the incremental risks of these were lower than those of other electric arc furnaces investigated in this study. Furthermore, comparing background cancer mortality for incremental PCDD/Fs risks of steel and iron industry, the total PCDD/Fs population risks contributed from steel and iron industry are low but still cannot be ignored.
机译：烧结厂和电弧炉是PCDD / Fs最重要的排放源。为了了解钢铁行业PCDD / Fs风险的贡献和分布，已经对台湾所有烧结厂和电弧炉进行了PCDD / Fs增量健康风险评估。这项研究结合了多媒体，多路径暴露模型和针对特定地点的暴露场景，以评估由22家钢铁工业公司（包括4个烧结厂和21个电弧炉）贡献的二恶英风险。在特定地点的暴露场景下，居住在上述排放源的25 km×25 km影响范围内的居民的癌症风险增量为3.10E-10至5.73E-06。在这22种排放源中，出口流量较高且运行特性较差的烟囱会带来更高的吸入风险。此外，台湾中部主要农业区的食源也增加了摄食风险。总之，在钢铁行业中，四座烧结厂占PCDD / Fs出口总量的24％以上，其增加的风险低于本研究中研究的其他电弧炉。此外，通过比较钢铁行业PCDD / Fs风险增加的背景癌症死亡率，钢铁行业贡献的PCDD / Fs人口风险总体较低，但仍然不能忽略。

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