通過熱裂解有效去除垃圾焚化飛灰中的戴奧辛及其他持久性有機污染物;Effective Removal Pcdd/Fs and Other Pops from Municipal Solid Waste Incinerator Fly Ash via Catalytic Pyrolysis

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/82442

Title:	通過熱裂解有效去除垃圾焚化飛灰中的戴奧辛及其他持久性有機污染物;Effective Removal Pcdd/Fs and Other Pops from Municipal Solid Waste Incinerator Fly Ash via Catalytic Pyrolysis
Authors:	張木彬
Contributors:	國立中央大學環境工程研究所
Keywords:	焚化飛灰;戴奧辛;氯含量;觸媒裂解;fly ash;dioxin;chloride content;catalytic pyrolysis.
Date:	2020-01-13
Issue Date:	2020-01-13 14:53:45 (UTC+8)
Publisher:	科技部
Abstract:	台灣都市廢棄物焚化爐每年排放大量底灰及飛灰至環境中，其排放量高達1,200,000 至 1,300,000 噸/年，而飛灰因含有高濃度之氯離子、重金屬及有機污染物(如：戴奧辛、多氯聯苯、多氯萘及多環芳香烴)被視為有害廢棄物，為達到台灣環保署提倡之「零排放政策」，廢棄物焚化爐排放飛灰之再利用技術實有研究價值，過去文獻顯示戴奧辛於350oC缺氧條件下，去除效率可達95%，然而於此熱裂解的過程可能生成其他有機污染物，因此，本研究於飛灰熱裂解測試之前，將先以水洗方式洗出飛灰中氯離子，並以飛灰及煙道氣中之戴奧辛、多氯聯苯、多氯萘及多環芳香烴探討去除效率及機制，此外，本研究將加入以鈀金屬為基底之觸媒於熱裂解反應中，以利降低熱裂解反應溫度(<350oC)、增加戴奧辛去除效率及降低其他有機污染物生成可能性。然而由於觸媒於熱裂解反應之戴奧辛去除機制十分複雜，故本研究將藉由模擬及計算之結果，提出適當戴奧辛破壞機制之假設。藉由了解觸媒熱裂解之破壞戴奧辛機制後將調整操作溫度為200oC且戴奧辛去除效率可達95%。為符合零廢棄政策，本研究將單載磁性氧化鐵於鈀觸媒並建立連續式熱裂解系統，將觸媒回收再利用，以符合環境工程應用之潛力。 ;The amount of bottom ash (BA) and fly ash (FA) released from all municipal solid waste incinerators (MSWIs) in Taiwan is between 1,200,000 to 1,300,000 tons/year. FA is classified as hazardous waste because it contains high concentrations of chloride, heavy metals and organic pollutants (PCDD/Fs, dl-PCBs, PCN and PAHs). To attain the target of “zero waste policy” enacted by Taiwan EPA, recycle of FA from MWIs should be conducted. Previous studies indicate that 95% of PCDD/Fs in fly ash can be removed at 350oC under oxygen-deficit condition. However, formation of other organic pollutants is observed in the exhaust gas of the pyrolysis system. In this study, FA will be pre-washed to reduce chloride content before being treated with catalytic pyrolysis and PCDD/Fs, dl-PCBs, PCN and PAHs concentrations in fly ash and exhaust gas will be determined. Moreover, different palladium (Pd)-based catalysts will be added to the pyrolysis process in in-situ and ex-situ system at a temperature lower than 350oC to enhance the PCDD/Fs destruction efficiency and reduce the formation of organic pollutants formation in the exhaust gas. The mechanisms for removing PCDD/Fs in the catalytic pyrolysis treatment system are complicated. Therefore, this study is expected to propose appropriate
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Graduate Institute of Environmental Engineering ] Research Project

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