本研究主要兩個目的為防止戴奧辛由重度污染場址轉移至周界環境之中與削減醫療廢棄物焚化爐中戴奧辛之排放。首先,我們選擇受到重度戴奧辛汙染的五氯酚工廠廠區內土壤與水體進行戴奧辛分布比例模擬試驗(土壤與水體中戴奧辛濃度分別為14.4 µg I-TEQ kg-1與11.97 pg I-TEQ L-1)，本試驗將於污染場址中採集之土壤篩分為26, 180 與 250 μm三種不同粒徑，取30g土壤放入含20L水體採集於原廠址海水儲存池水之水槽中攪拌後靜置等候戴奧辛濃度於懸浮固體相、水相與底層沉積土三者間達到平衡。根據質量平衡守則，分析結果顯示戴奧辛平衡濃度分配係數與土壤粒徑大小無明顯相關，且戴奧辛毒性當量存在於懸浮固體相與溶解相與底層沉積土中百分比分別為0.07%, 0.005%, and 99.93%，大部分戴奧辛仍然吸附於原本土壤之中。本研究選定兩座日處理量相仿但分別配置單濾袋(MWI-A)及雙濾袋系統(MWI-B)之醫療廢棄物焚化爐以調查其戴奧辛之去除率，以及戴奧辛於各空氣汙染防制設備中之質量分布。根據調查結果，戴奧辛主要去除作用發生於在於活性碳噴注後之袋式集塵器中，雙濾袋系統(MWI-A)之戴奧辛去除效率為99.7%，高於單濾袋系統(MWI-B)的戴奧辛去除效率99.0%，可有效削減戴奧辛排放量。

In this study, two major aims are to prevent the polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) transfer to surrounding environment in a heavily dioxin contaminated site and to reduce the PCDD/F emission from a medical waste incinerator (MWI). First, the contents of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were measured in soil and water impacted by a chemical factory (chloralkali and pentachlorophenol) and both the PCDD/F contents in soil (14.4 µg I-TEQ kg-1) and water (11.97 pg I-TEQ L-1) were heavily contaminated. Additionally, the PCDD/F distributions in the aquatic environment (suspended solid and dissolved phases) were investigated by performing a water tank experiment with 30 g of soil and 20 L of water. Moreover, the effects of PCDD/F distributions in water were estimated base on three soil sizes (26, 180 and 250 μm). From a mass balance perspective, the suspended solid, dissolved phase and settled soil contributed 0.07%, 0.005%, and 99.93%, respectively, with the highest amount of PCDD/F in the settled soil deserve more attention. The PCDD/F distribution in the suspended solid phase was dominant, while its distribution was independent of soil size. Additionally, placing soil with a high PCDD/F content in water increased the PCDD/F content in suspended solid phase. Moreover, the equation developed in this study can accurately predict the PCDD/F partition between the suspended solid and dissolved phases. Second, this study investigated the polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) removal efficiencies in two medical waste incinerators (MWIs) -MWI-A and MWI-B, with waste burning capacities of 9.12 and 12 tons per day, with dual-and single-bag filter systems, respectively. The PCDD/Fs in the stack flue gas and fly ashes of each air pollution control device (APCD) unit were collected concurrently. Based on mass balance, it was determined that the major PCDD/F removal occurred in the bag filter system with activated carbon injection (ACI). The total PCDD/F emission removal efficiencies for the whole dual-bag filter system, bag filter 1 (BF1), bag filter 2 (BF2) in MWI-A and the single bag filter system (BF) in MWI-B were 99.7%, 84.8%, 98.0%, 99.0% on the mass basis, respectively. The PCDD/F emission ratio (the escaped PCDD/F ratio after all APCDs) with the dual-bag filter system was over four times lower than that with a single bag filter. The results demonstrate a very efficient way to reduce the excess PCDD/F emissions incurred by intermittent operations and irregular waste feeding.

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