State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Institute of Environment and Health, Jianghan University, Wuhan, 430056, PR China.
Environ Pollut. 2018 Nov;242(Pt B):1346-1352. doi: 10.1016/j.envpol.2018.08.025. Epub 2018 Aug 11.
Chlorinated and brominated polycyclic aromatic hydrocarbons (Cl/Br-PAHs) are widespread persistent organic pollutants (POPs) in environments. Identifying the new sources of Cl/Br-PAHs is important for implementing source control and reducing environmental risk. Although co-processing of solid wastes by cement kilns increased recently, the occurrences and characteristics of Cl/Br-PAHs as emerging POPs during cement kiln co-processing solid wastes have not been investigated. This study firstly investigated the occurrences, characteristics, and variations of Cl/Br-PAHs from four cement kilns co-processing different solid wastes. The concentration ranges of Cl-PAHs and Br-PAHs in stack gas samples from the investigated cement kilns were 15.6-94.1 ng m and 1.04-4.28 ng m, respectively. Emission factors of Cl-PAHs and Br-PAHs through stack gases were 29.9-275 μg t and 3.0-8.3 μg t, respectively. Variations of Cl/Br-PAHs in particle samples collected from different process stages within the cement kiln system indicated that the kiln end was the major formation zone for Cl/Br-PAHs. Congener profiles of Cl/Br-PAHs varied with the co-processed solid waste types, indicating the important influence of raw material compositions. Calculations of net emissions of Cl/Br-PAHs within the cement kiln systems suggested efficient destruction (87.6%-98.8%) of Cl/Br-PAHs by the cement kilns.
氯代和溴代多环芳烃（Cl/Br-PAHs）是环境中广泛存在的持久性有机污染物（POPs）。识别 Cl/Br-PAHs 的新来源对于实施源头控制和降低环境风险非常重要。尽管近年来水泥窑协同处理固体废物的比例有所增加，但在水泥窑协同处理固体废物过程中作为新兴持久性有机污染物的 Cl/Br-PAHs 的存在情况和特征尚未得到研究。本研究首次调查了四个协同处理不同固体废物的水泥窑中 Cl/Br-PAHs 的存在情况、特征和变化。调查水泥窑废气样品中 Cl-PAHs 和 Br-PAHs 的浓度范围分别为 15.6-94.1 ng m 和 1.04-4.28 ng m。通过废气排放的 Cl-PAHs 和 Br-PAHs 的排放因子分别为 29.9-275 μg t 和 3.0-8.3 μg t。从水泥窑系统不同工艺阶段采集的颗粒样品中 Cl/Br-PAHs 的变化表明，窑尾是 Cl/Br-PAHs 的主要形成区。Cl/Br-PAHs 的同系物分布随协同处理的固体废物类型而变化，表明原料组成的重要影响。在水泥窑系统内计算 Cl/Br-PAHs 的净排放量表明，水泥窑对 Cl/Br-PAHs 具有高效的破坏作用（87.6%-98.8%）。
