Ying Yuxuan, Xu Liang, Lin Xiaoqing, Zhang Hao, Li Xiaodong, Lu Shengyong, Cao Yang, Long Jisheng
State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, China.
Tianjin Eco-Environmental Monitoring Center, Tianjin Ecology and Environment Bureau, Tianjin, 300192, China.
Environ Sci Pollut Res Int. 2023 Jan;30(3):5903-5916. doi: 10.1007/s11356-022-22437-7. Epub 2022 Aug 19.
Few studies focused on the emission of polychlorinated-ρ-dibenzodioxins and dibenzofurans (PCDD/F) from different kinds of waste incinerators. This study was conducted in a full-scale MSW incineration plant to investigate the influence of different incinerator types on PCDD/F. Experimental results indicated that the 2,3,7,8-PCDD/F concentration in the inlet gas of the air pollution control system (APCS) in the studied fluidized bed was higher (2.03 ng I-TEQ/Nm) than that of the grate (0.77 ng I-TEQ/Nm). But gas in the outlet of APCS from both incinerators had an approximate concentration, lower than the Chinese emission limit of 0.1 ng I-TEQ/Nm. Similar distribution patterns were observed for 2,3,7,8-PCDD/Fs, as well as 136 PCDD/F congeners. Specifically, OCDD and 1,2,3,4,6,7,8-HpCDD were major isomer constituents for 2,3,7,8-PCDD/F isomers. In terms of formation pathways, a similar formation mechanism was observed based on fingerprint characteristics of 136 PCDD/F congeners. De novo synthesis was the dominating formation pathway for both incinerators. Meanwhile, DD/DF chlorination was another contributor to PCDD/F formation, which in the fluidized bed was higher. In addition, little correlation (0.009 < R < 0.533) between conventional pollutants (HCl, CO, PM) and PCDD/Fs was found, suggesting little high-temperature synthesis observed and verifying the dominance of de novo synthesis.
很少有研究关注不同类型垃圾焚烧炉中多氯代二苯并二恶英和多氯代二苯并呋喃（PCDD/F）的排放情况。本研究在一座全尺寸城市固体废弃物焚烧厂进行，以调查不同类型焚烧炉对PCDD/F的影响。实验结果表明，在所研究的流化床中，空气污染控制系统（APCS）入口气体中的2,3,7,8-PCDD/F浓度（2.03 ng I-TEQ/Nm³）高于炉排炉（0.77 ng I-TEQ/Nm³）。但两座焚烧炉APCS出口气体中的浓度相近，均低于中国0.1 ng I-TEQ/Nm³的排放限值。对于2,3,7,8-PCDD/Fs以及136种PCDD/F同系物，观察到了相似的分布模式。具体而言，八氯二苯并二恶英（OCDD）和1,2,3,4,6,7,8-七氯二苯并二恶英（1,2,3,4,6,7,8-HpCDD）是2,3,7,8-PCDD/F异构体的主要异构体成分。在生成途径方面，基于136种PCDD/F同系物的指纹特征观察到了相似的生成机制。从头合成是两座焚烧炉的主要生成途径。同时，二恶英/呋喃的氯化反应是PCDD/F生成的另一个贡献因素，在流化床中该因素的贡献更高。此外，发现常规污染物（HCl、CO、PM）与PCDD/Fs之间的相关性很小（0.009 < R < 0.533），这表明高温合成现象很少，证实了从头合成的主导地位。
