Unintentional production of persistent chlorinated and brominated organic pollutants during iron ore sintering processes
Unintentional production of persistent chlorinated and brominated organic pollutants during iron ore sintering processes
复制标题
铁矿石烧结过程中无意产生持久性氯化和溴化有机污染物
DOI：
10.1016/j.jhazmat.2017.02.027
复制
发表时间：
2017-06-05
影响因子：
13.6
通讯作者：
Chen, Yuan
中科院分区：
文献类型：
--
作者：
Li, Sumei;Liu, Guorui;Chen, Yuan
铁矿石烧结工艺是无意产生的氯化持久性有机污染物（POP）的主要来源，包括多氯二苯并对二恶英/二苯并呋喃（PCDD/Fs）、多氯联苯（PCB）和多氯萘（PCN）。然而，在SNT过程中，溴化持久性有机污染物，如多溴二苯并二恶英/二苯并呋喃（PBDD/Fs）和多溴二苯醚（PBDEs）的排放研究很少。收集并分析了中国6个典型SNT电厂的烟道气和飞灰样品，以确定PCDD/Fs、PCBs、PCNs、PBDD/Fs和PBDEs的浓度和分布，以及这些化合物之间的相关性。多氯二苯并对二恶英/多氯二苯并呋喃、多氯联苯、多氯化萘、多溴二苯并对二恶英/多氯二苯并呋喃和多溴二苯醚的排放系数分别为2.47、0.61、552、0.32和107微克/吨（分别为109、4.07、10.4、4.41和0.02纳克毒性当量/吨）。按质量计，多氯联苯是含量最高的化合物，多氯化萘次之，分别占持久性有机污染物总浓度的51%和42%。然而，多氯二苯并对二恶英/多氯二苯并呋喃是氯化和溴化持久性有机污染物毒性当量浓度的主要贡献者，占总毒性当量浓度的89%。多氯二苯并对二恶英/多氯二苯并呋喃与其他氯化和溴化持久性有机污染物的浓度呈正相关，这表明可以利用针对多氯二苯并对二恶英/多氯二苯并呋喃开发的最佳可得技术/最佳环保做法协同减少氯化和溴化持久性有机污染物的排放。(C)2017爱思唯尔B. V.保留所有权利。
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 107 mu g t(-1), respectively (109, 4.07, 10.4, 4.41 and 0.02 ng toxic equivalents t(-1), 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. (C) 2017 Elsevier B.V. All rights reserved.