| Summary: | 碩士 === 國立中央大學 === 環境工程研究所碩士在職專班 === 93 === Evaluation of the dioxin removal efficiencies of the air pollution control devices (APCDs) at existing industrial sludge incinerator (ISI) in Taiwan is conducted via stack sampling and analysis in this study. The ISI investigated (capacity: 12 tons/day) is equipped with venturi scrubber followed by bag filter (BF). The PCDD/F concentrations measured at venturi scrubber inlet is 0.046 ng-I-TEQ/Nm3 which is lower than that measured at stack (0.321 ng-I-TEQ/Nm3). The results indicate that PCDF concentration is much higher than PCDD measured in flue gas of BF inlet and outlet in the ISI investigated. The flue gas is quenched by venturi scrubber, with the temperature being decreased from 440°C to 173°C. Therefore, the PCDD/F concentration measured at stack gas is significant higher than that measured at BF inlet because the operating temperature of the APCD falls into the temperature window of de novo synthesis (200~350°C). Besides, the results of vapor/solid-phase PCDD/F sampling also indicate that the about 50% PCDD/F congeners exist in solid phase. Hence, the removal efficiency of particle and solid-phase PCDD/F achieved with BF in the ISI investigated should be improved to further reduce its PCDD/Fs emissions. Overall, this study preliminary evaluates the PCDD/F concentration and congener distribution in flue gas of an existing ISI. The results of this study provide important references for the industry in terms of design and operation of ISIs.
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