本研究針對選定之S廠與C廠二座大型都市垃圾焚化爐，進行煙道廢氣以及灰渣中戴奧辛/呋喃之特徵研究。此研究結果將有助於
戴奧辛形成機制之瞭解並為焚化爐的操作提供有用的資訊。研究中採集C廠之煙道廢氣及袋式集塵器中飛灰; S廠中採集煙道廢氣及灰渣(包括底渣、過熱器、節熱器、半乾式洗煙塔、袋式集塵器後輸送帶及飛灰貯存筒)，並分析樣品中戴奧辛及氯離子含量。研究結果顯示，
S廠與C廠之煙道廢氣中之總PCDD/Fs I-TEQ濃度及煙道廢氣中PCDD/Fs I-TEQ排放係數分別為0.133與0.0359 ng I-TEQ/Nm3 以及0.968與0.223 μg I-TEQ/ ton-waste。C廠之集塵器灰渣中PCDD/Fs含量及氯離子含量分別為0.392 ng I-TEQ/g及47.8 mg/g。另一方面，S廠之底渣、過熱器、節熱器、半乾式洗煙塔、袋式集塵器及飛灰貯存筒灰渣中PCDD/Fs含量及氯離子含量分別為0.00811、0.0411、4.71、0.317、1.45與2.46 ng I-TEQ/g，以及5.27、33.0、46.5、85.2、142與163 mg/g。研究中發現，燃燒室與過熱器之操作溫度並不合適PCDD/Fs之生成，故底渣與過熱器飛灰中PCDD/Fs含量很低。當廢氣流至節熱器時，因其操作溫度適合PCDD/Fs生成，故節熱器飛灰之PCDD/Fs明顯增高。然而，半乾式洗煙塔飛灰之PCDD/Fs含量，則因添加生石灰而呈現下降趨勢。雖然袋式集塵器之操作溫度已降至約164℃，但因飛灰停留時間相對較長，再加上活性碳會捕捉PCDD/Fs，故使得式集塵器飛灰之PCDD/Fs含量呈現上升之趨勢。再者，國內已於95年12月14日公布「有害事業廢棄物認定標準」，並將戴奧辛有害事業廢棄物納入法規管制，管制值為1 ng I-TEQ/g。故，由於節熱器、袋式集塵器與飛灰貯存筒飛灰均超過法規管制值，將會被認定為戴奧辛有害事業廢棄物。

This study investigated the characteristics of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) in the stack flue gases and ashes of two municipal waste incinerators (MSWI-C and MSWI-S). Results obtained will be helpful to understand the PCDD/Fs formation mechanisms and to provide the useful information for the operation of incinerators. The stack flue gas and fabric filter ash from MSWI-C, and the stack flue gas and ashes (including bottom, super heater, economizer, semi-dry scrubber, fabric filter and ash storing tube) from the MSWI-S were sampled to analyze their PCDD/F and chlorine contents. Results show that the mean total-PCDD/F concentration and the mean PCDD/F emission factors in the stack flue gases of MSWI-C and MSWI-S are 0.0359 and 0.133 and ng I-TEQ/Nm3, and 0.223 and 0.968 μg I-TEQ/ton-waste, respectively. The mean total-PCDD/F and chlorine contents in the fabric filter ash from MSWI-C are 0.392 ng I-TEQ/g and 47.8 mg/g, respectively. On the other hand, the mean total-PCDD/F and chlorine contents in the ashes of bottom, super heater, economizer, semi-dry scrubber, fabric filter and ash storing tube of MSWI-S are 0.00811, 0.0411, 4.71, 0.317, 1.45 and 2.46 ng I-TEQ/g, and 5.27, 33.0, 46.5, 85.2,142 and 163 mg/g, respectively. It was found that the operating temperatures of combustion chamber and super heater are unsuitable for PCDD/F formation; therefore, the PCDD/F contents of the bottom and the super heater ashes were very low. When the flue gas passed through the economizer, the PCDD/F contents increase obviously due to its appropriate temperature of PCDD/F formation. However, the PCDD/F content in the ash of semi dry scrubber is quickly dropped because of the addition of lime. Although the operating temperature of the fabric filter has fallen to 164°C, the relatively long resident time of ashes and the capture reaction of the activated carbon caused the higher PCDD/F contents. Moreover, the “dioxinous hazardous industrial waste” with overall toxic equivalent concentration exceeding 1.0ng I-TEQ/g has been designated as hazardous waste by Taiwan EPA on December 2006. Consequently, due to the exceeding contents of economizer, fabric filter and ash storing tube ashes, those will be recognized as the hazardous waste.

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