Concentrations, spatial and seasonal variations of PCDD/Fs in ambient air around a municipal solid waste incinerator-a case study in Beijing
QI Li, REN Yue, LI Nan, ZHENG Sen, ZHAO Hu, FAN Shuang, ZHOU Zhi-guang, XU Peng-jun, LIU Ai-min, ZHANG Ting, HUANG Ye-ru
State Environmental Protection Key Laboratory of Dioxin Pollution Control, National Research Center for Environmental Analysis and Measurement, Beijing 100029, China
The concentrations, profiles and seasonal variations of PCDD/Fs in ambient air around a municipal solid waste incinerator(MSWI) in Beijing from April 2013 to January 2014 were investigated. The mass concentrations and TEQ of 2, 3, 7, 8-substituted PCDD/Fs in the air samples ranged from 8.3 to 115pg/m3 and from 0.11to 1.9pg I-TEQ/m3, respectively. The concentration values at 1sampling site in autumn and all 5sampling sites in winter were higher than the ambient air standard of 0.6pg I-TEQ/m3 for dioxins regulated in Japan. 1, 2, 3, 4, 6, 7, 8-HpCDF and OCDF dominated PCDD/Fs in all the samples for all four seasons, while 2, 3, 4, 7, 8-PeCDF was the dominant congener contributing to TEQ. The spatial distribution basically exhibited a trend that the concentrations at site close to the MSWI(~400m) are higher whereas those at other sites(>1000m) are comparable and not related to the distances from the source. Seasonal variation showed obviously higher concentration in winter than the other three seasons, which may attribute to domestic heating and worse atmospheric dispersion that occur in winter. The homologue and congener profiles of PCDD/Fs in the air samples differed from those of the flue gas emission from the MSWI, consistent with the principal component analysis results, indicating that the concentrations of PCDD/Fs in ambient air were not affected by the MSWI exclusively, but jointly influenced by multiple sources. Dioxin inhalation exposure dose estimation showed that the dioxin inhalation exposure risk of residents living in the studied area was at a relative safe level(0.034~0.161pg I-TEQ/(kg·d)). However, the dioxin inhalation exposure risk in heavily polluted seasons still needed great concerns.
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QI Li, REN Yue, LI Nan, ZHENG Sen, ZHAO Hu, FAN Shuang, ZHOU Zhi-guang, XU Peng-jun, LIU Ai-min, ZHANG Ting, HUANG Ye-ru. Concentrations, spatial and seasonal variations of PCDD/Fs in ambient air around a municipal solid waste incinerator-a case study in Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(4): 1000-1008.
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