Emission characteristics of PCDD/Fs in stack gas from municipal solid waste incineration plants in Northern China
Emission characteristics of PCDD/Fs in stack gas from municipal solid waste incineration plants in Northern China
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北方城市生活垃圾焚烧厂烟气中PCDD/Fs的排放特征
DOI：
10.1016/j.chemosphere.2018.02.092
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发表时间：
2018
期刊：
影响因子：
8.8
通讯作者：
Hong Chengyang
中科院分区：
文献类型：
--
作者：
Zhu Feng;Li Xiaofei;Lu Jia-Wei;Hai Jing;Zhang Jieru;Xie Bing;Hong Chengyang
采用气相色谱-高分辨质谱联用技术（HRGC-HRMS）研究了北方6个城市垃圾焚烧厂（MSWIs）57个烟道气样品中二恶英（PCDD/Fs）的排放特征，包括同系物组成、气体排放量和毒性当量浓度（TEQ）指标。此外，还简要讨论了垃圾焚烧厂二恶英/Fs的形成机理。结果显示，6个垃圾焚烧厂的烟道气中二氯二苯并对二恶英和二氯二苯并呋喃的排放浓度和当量浓度分别为0.11-2.53 ng Nm− 3和0.007-0.059 ng TEQ Nm−3。6个垃圾焚烧厂的多氯二苯并对二恶英和多氯二苯并呋喃的排放系数从0.027至0.225微克I-TEQ吨-1不等，平均值为0.17微克I-TEQ吨-1废物，估计6个垃圾焚烧厂每年向大气排放234.96毫克I-TEQ的多氯二苯并对二恶英和多氯二苯并呋喃。O 8 CDD、O 8 CDF和1，2，3，4，6，7，8-H7 CDD可作为PCDD/Fs在环境介质中，尤其是在生活垃圾焚烧厂周围环境中的指示性化合物。1，2，3，7，8，9-H6 CDF和1，2，3，4，7，8-H6 CDF可作为监测PCDD/Fs排放的毒性当量指标。基于正矩阵分解（PMF）模型，通过PMF分析提取了8个因子。低氯PCDDs（1，2，3，7，8-P5 CDD、1，2，3，4，7，8-H6 CDD、1，2，3，6，7，8-H6 CDD和1，2，3，7，8，9-H6 CDD）的生成具有较强的相关性，氯酚类物质可能是低氯PCDDs的重要前体物质，它们在低氯含量下生成。垃圾焚烧产生的烟道气中五氯和六氯二苯并呋喃的形成可能会阻碍碳形成多氯二苯并呋喃的催化位点。同时，高氯代PCDDs（hepta-PCDDs和octa-PCDDs）和高氯代PCDFs（hepta-PCDFs和octa-PCDFs）的可能形成机制也各不相同。
Emission characteristics including congener's profile, gas emissions and toxic equivalent concentration (TEQ) indicators of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in 57 stack gas samples from 6 municipal solid waste incinerators (MSWIs) in Northern China were investigated by gas chromatography-high resolution mass spectrometry (HRGC-HRMS). Additionally, PCDD/Fs formation mechanisms from the MSWIs were briefly discussed. Results revealed that the concentrations and equivalent concentrations of PCDD/Fs emissions in stack gas from 6 MSWIs were in the range of 0.11–2.53 ng Nm−3and 0.007–0.059 ng TEQ Nm−3, respectively. The emission factors of PCDD/Fs from 6 MSWIs varied from 0.027 to 0.225 μg I-TEQ tonne−1, with a mean value of 0.17 μg I-TEQ tonne−1waste, which was estimated to an annual emission of 234.96 mg I-TEQ of PCDD/Fs from 6 MSWIs to the atmosphere. O8CDD, O8CDF and 1,2,3,4,6,7,8-H7CDD were the indicatory compounds of PCDD/Fs to apportion the sources of PCDD/Fs in environmental medium especially in ambient environment of MSWIs. 1,2,3,7,8,9-H6CDF and 1,2,3,4,7,8-H6CDF can be used as TEQ indicators for monitoring PCDD/Fs emission. Based on the positive matrix factorization (PMF) model, eight factors were extracted by the PMF analysis. Formation of low-chlorinated PCDDs (1,2,3,7,8-P5CDD, 1,2,3,4,7,8-H6CDD, 1,2,3,6,7,8-H6CDD and 1,2,3,7,8,9-H6CDD) possessed strong correlation, and the chlorophenols maybe the important precursors of low-chlorinated PCDDs, which were generated within the low chlorinated content. Penta- and hexa-PCDFs formation in stack gas from MSWI may block catalytic sites for PCDFs formation from carbon. Meanwhile, possible formation mechanisms of high-chlorinated PCDDs (hepta- and octa-PCDDs) and high-chlorinated PCDFs (hepta- and octa-PCDFs) were respectively dependent.