State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; School of Environment, Tsinghua University, Beijing 100084, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Hazard Mater. 2017 Jun 5;331:63-70. doi: 10.1016/j.jhazmat.2017.02.027. Epub 2017 Feb 20.
Iron ore sintering (SNT) processes are major sources of unintentionally produced chlorinated persistent organic pollutants (POPs), including polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs), polychlorinated biphenyls (PCBs), and polychlorinated naphthalenes (PCNs). However, few studies of emissions of brominated POPs, such as polybrominated dibenzo-p-dioxins/dibenzofurans (PBDD/Fs) and polybrominated diphenyl ethers (PBDEs), during SNT have been performed. Stack gas and fly ash samples from six typical SNT plants in China were collected and analyzed to determine the concentrations and profiles of PCDD/Fs, PCBs, PCNs, PBDD/Fs, and PBDEs, as well as any correlations among these compounds. The PCDD/F, PCB, PCN, PBDD/F, and PBDE emission factors were 2.47, 0.61, 552, 0.32, and 107μgt, respectively (109, 4.07, 10.4, 4.41 and 0.02ng toxic equivalents t, respectively). PCBs were the most abundant compounds by mass, while PCNs were the next most abundant, contributing 51% and 42% to the total POP concentration, respectively. However, PCDD/Fs were the dominant contributors to the chlorinated and brominated POP toxic equivalent concentrations, contributing 89% to the total toxic equivalent concentration. The PCDD/F and other chlorinated and brominated POP concentrations were positively correlated, indicating that chlorinated and brominated POP emissions could be synergistically decreased using the best available technologies/best environmental practices already developed for PCDD/Fs.
铁矿石烧结（SNT）过程是无意产生的氯化持久性有机污染物（POPs）的主要来源，包括多氯二苯并对二恶英/呋喃（PCDD/Fs）、多氯联苯（PCBs）和多氯萘（PCNs）。然而，对于 SNT 过程中溴化 POPs（如多溴二苯并对二恶英/呋喃（PBDD/Fs）和多溴联苯醚（PBDEs））的排放，研究甚少。本研究采集了中国 6 个典型 SNT 工厂的烟囱气和飞灰样品，并对其进行了分析，以确定 PCDD/Fs、PCBs、PCNs、PBDD/Fs 和 PBDEs 的浓度和分布情况，以及这些化合物之间的相关性。PCDD/F、PCB、PCN、PBDD/F 和 PBDE 的排放因子分别为 2.47、0.61、552、0.32 和 107μgt（109、4.07、10.4、4.41 和 0.02ng 毒性当量 t，分别）。以质量计，PCBs 是最丰富的化合物，而 PCNs 是第二丰富的化合物，分别占总 POP 浓度的 51%和 42%。然而，PCDD/Fs 是氯化和溴化 POP 毒性当量浓度的主要贡献者，占总毒性当量浓度的 89%。PCDD/F 与其他氯化和溴化 POP 浓度呈正相关，这表明可以使用已经为 PCDD/Fs 开发的最佳可行技术/最佳环境实践来协同减少氯化和溴化 POP 的排放。
