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Emissions of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans from the Incinerations of Both Medical and Municipal Solid Wastes

並列摘要


Emissions of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) from the stack flue gases of four medical waste incinerators (MWIs) and ten municipal solid waste incinerators (MSWIs) were investigated. The mean PCDD/F concentrations in the stack flue gases of these MWIs and MSWIs is 0.521 ng I-TEQ Nm^(-3) and 0.0533 ng I-TEQ Nm^(-3), respectively. In the stack flue gases of MWIs, OCDD, 1,2,3,4,6,7,8-HpCDD, 1,2,3,4,6,7,8-HpCDF and OCDF were the major congeners, while in MSWIs, OCDD and 1,2,3,4,6,7,8-HpCDD were the major ones. The mean PCDD/F emission factors (20.1µg I-TEQ ton-waste^(-1)) of the MWIs was about 210 times of magnitude higher than that of MSWIs, which was 0.0939µg I-TEQ ton-waste^(-1). In Taiwan, the annual emissions of PCDD/Fs from MWIs and MSWIs are 0.371g I-TEQ year^(-1) and 0.737g I-TEQ year^(-1), respectively. Although the contribution of PCDD/Fs from MWIs to the atmosphere was 50.3% of that from MSWIs, it should be noted that most MWIs are equipped with a low stack and are situated in the proximity of the residential area and PCDD/F emissions from MWIs could significantly affect its surrounding environment.

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