水洗飛灰作為生垃圾焚化減氯劑之可行性評估

國內外焚化飛灰再利用技術可分為「無害化之前處理技術」以及「再利用技術」兩類，無害化前處理技術包括溶液萃取、高溫破壞、戴奧辛等有機物破壞分解及將有害物質固定其中使其無法轉移出來等技術。其中溶液萃取技術包含水洗前處理及酸洗、鹼洗或添加螯合劑前處理，本研究之目的在於探討飛灰經水洗後作為生垃圾焚化減氯劑之可行性研究。經八小時的實廠投入研究結果顯示，除造成煙道氣戴奧辛濃度略高外，未導致飛灰或底渣中之鉛及戴奧辛濃度濃度上升，顯示生垃圾添加水洗飛灰並不會對底渣品質產生任何影響，飛灰經水洗前處理後進生垃圾作減氯劑(底渣化)為一可行方案。

關鍵字

都市垃圾焚化廠；飛灰再利用；水洗灰；生垃圾減氯劑

並列摘要

The incineration fly ash recycling technologies can be divided into two categories: non-hazardous pre-treatment technology and reuse technology. The non-hazardous pre-treatment technologies include solution extraction, high-temperature destruction, damage decomposition of Dioxin, and solidification of harmful substances. The solution extraction technologies include the pretreatment of water washing, acid washing, alkali washing, or the addition of chelator. The purpose of this study was to investigate the feasibility of using watering fly ash as the chlorine-reducing agent. The actual plant investment results show that, apart from it caused a slight increase in the production of dioxin in the flue gas, no other adverse effects on the incineration operation, did not lead to an increase in the concentration of lead in fly ash and bottom ash, and no increase in the concentration of dioxin in the bottom ash. Adding washing ash does not have any effect on the quality of the bottom ash. The use of watering fly as a chlorine-reducing agent is a feasible solution.