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| Characteristics and ozone formation potential of fugitive volatile organic compounds (VOCs) emitted from petrochemical industry in Pearl River Delta |
| LI Qin-qin1,2,3, ZHANG Zhi-juan1,2, LI Yang1,2,3, GONG Dao-cheng1,2, GAO Jie1,2,3, ZHANG Chun-lin1,2, WANG Bo-guang1,2 |
1. Environment and Climate Institute, Jinan University, Guangzhou 510632, China;
2. Institute of Atmospheric Environmental Safety and Pollution Control, Jinan University, Guangzhou 510632, China;
3. Research Center on Low-carbon Economy for Guangzhou Region, Jinan University, Guangzhou 510632, China |
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Abstract Refinery installations, chemical installations and wastewater treatment installations of typical petrochemical facilities were selected in Pearl River Delta where the photochemistry was active. Multiple on-line and off-line monitoring instruments were used to analyze the fugitive emission characteristics of VOCs. The ratios of m, p-xylene/benzene (X/B), toluene/benzene (T/B) and ethyl benzene/benzene (E/B) were applied to analyze the aging characteristics of VOCs. The atmospheric chemical reactivity of VOCs and their Ozone Formation Potential (OFP) were evaluated by using Maximum Increment Reactivity (MIR), propy-equiv concentration and OH radical reactivity methods. The concentrations of TVOCs in refinery unit and chemical unit were both higher in the morning and night, lower at noon. However, for the wastewater treatment unit, it's bimodal. Alkanes were the most abundant species in all the three units, and VOCs emitted from different units were totally different. The ratio of X/B, T/B and E/B in petroleum refinery were higher than that in cities and suburbs, while T/B of Compression Alkali Washing area (CAW) in the chemical units was the highest. The photochemical reactivity of VOCs in the petroleum refinery was higher than that in cities and suburbs. Moreover, the average OH consumption rate of VOCs emitted from the petroleum refinery was 15.22×10-12cm3/ (mol·s), and the largest incremental reactivity was 4.21mol (O3)/mol (VOC). The OFP estimated from the VOCs in the chemical units accounted for the highest ratio, which is up to 84.83%. While the VOCs emitted from the wastewater treatment unit was the second, with the ratio of 12.95%. And, the contribution of refinery installation area was the lowest, with the ratio of 2.22%. The contribution of CAW in chemical installation unit to the OFP of the petroleum refinery was the highest with the ratio of 34.26%. The contribution of Flotation Tank (FT) in wastewater treatment unit was the lowest with the ratio of 0.36%.
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Received: 09 March 2016
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