Experimental and modeling study of de novo formation of PCDD/PCDF on MSW fly ash |
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| Authors: | LI Xiao-dong ZHANG Ji YAN Jian-hu CEN Kef RYAN Shawn P GULLETT Brian K and LEE Chunwai |
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| Institution: | 1. State key Laboratory of Clean Energy Utilization,Institute for Thermal Power Engineering,Zhejiang University,Hangzhou 310027,China
2. U.S.Environmental Protection Agency,Office of Research and Development,National Risk Management Research Laboratory,E305-01,Research Triangle Park,North Carolina 27711,USA |
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| Abstract: | The effect of sulfur dioxide (SO2) on formation of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) has been studied in an entrained-flow reactor (EFR) under simulated waste combustion conditions. A chlorination model based on conditional probability was employed to evaluate the homologue patterns of PCDDs and PCDFs. Results revealed that the presence of SO2 did not change the formation pathway although SO2 suppressed PCDD/F formation. The model prediction of PCDF showed good agreement with the experimental data (R=0.95) while the prediction for PCDDs was not as good. This may be explained because potential chlorination pathways play a significant role in PCDF formation, while PCDDs are mainly formed through condensation reactions. Furthermore, the result indicated that the steric hindrance during formation has more effects on PCDD than on PCDF due to the symmetric molecule structures of PCDDs. |
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| Keywords: | PCDDs PCDFs de novo synthesis formation chlorination model sulfur dioxide air pollution waste combustion formation novo study modeling Experimental result steric hindrance during effects symmetric molecule structures condensation potential play significant role model prediction good experimental data |
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