Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/25616
標題: 四種前處理試劑對都市垃圾焚化爐底渣銅序列萃取之影響
Effects of four different pretreatments on the leaching of Cu of municipal solid waste incinerator bottom ashes by using sequential extraction procedures
作者: 平峻嘉
Ping, Jun-Jia
關鍵字: 底渣;bottom ash;銅;逐步萃取;Cu;sequential extraction procedures
出版社: 土壤環境科學系所
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摘要: 
台灣的焚化底渣產量與日俱增,底渣再利用已逐漸取代傳統的掩埋處理,成為政府追求的目標,其中底渣再利用途徑中,將底渣作為道路基材使用為世界各國廣泛運用方式之一。然而台灣底渣中常含有大量的重金屬銅,因此具有相當高的淋洗潛勢,若未經妥善處理,銅於再利用的過程中容易淋洗流出造成土壤和地下水汙染。本篇研究探討使用硫化鈉、磷酸三鈉、乙二胺四乙酸(Ethylene diamine tetraacetie acid)和吡咯烷二硫代氨基甲酸銨(Pyrrolidine dithiocarbamate)對粒徑0.1~2mm之底渣進行不同的前處理,並利用管柱淋洗試驗探討不同前處理對於銅穩定化能力的比較,並以序列萃取實驗分析底渣銅型態的變化。

未經處理粒徑0.1~2mm底渣銅主要鍵結型態為殘留態約51.5 %、有機物/硫化物鍵結態約26.9 %、鐵錳氧化態約11.4 %、碳酸鹽結合態約9.49 %、離子交換態約0.70%。前處理實驗結果,硫化鈉、磷酸三鈉和PDTC處理後均能降低底渣銅淋洗溶出,硫化鈉降低底渣中碳酸鹽鍵結態和鐵錳氧化物鍵結態,而有機/硫化物鍵結態銅則有上升的趨勢;磷酸三鈉使容易淋洗的碳酸鹽鍵結態和有機鍵結態銅轉為較難溶的殘留態,可以降低銅的淋洗溶出;PDTC處理銅穩定化效率為三者最高,0.2%濃度浸泡一天處理穩定化效率達97%,PDTC處理後底渣殘留態比例有明顯上升;EDTA能萃取底渣中約20%的銅,降低底渣中銅含量,可藉此降低底渣再利用時銅的淋洗潛勢。硫化鈉、磷酸三鈉和PDTC浸泡一天間處理較短時間處理的穩定化效率高,為短時間處理底渣無法與藥劑進行全面反應而導致穩定化偏低。

In Taiwan, large quantities of municipal solid wastes incinerator (MSWI)bottom ash generated and subsequent disposal of bottom ash from the incineration of municipal solid wastes have presented a significant problem. Recycling of MSWI bottom ash is a topic of growing importance for field of waste management. The application of bottom ash as the road pavement is widely used around the world. However, the content of Cu is relatively high in MSWI bottom ash, and it has a high leaching potential. This study mainly examines the effects of four different agents (Na2S, Na3PO4, PDTC and EDTA) pretreatments on the leaching of Cu of MSWI bottom ashes( 0.1–2 mm) fraction by using sequential extraction procedures.
Results of sequential extraction procedures of untreated bottom ash show that 0.70% Cu is exchangeable, fraction bounded to carbonate accounts for 9.49%, fraction bounded to Fe-Mn oxides accounts for 11.4%, fraction bounded to organic matters/sulfide accounts for 26.9%, and the remaining 51.5% is residual. Through the Na2S pretreatment test, carbonate and Fe-Mn oxide fractions of Cu in MSWI bottom ash was transferred to organic matters/sulfide fraction. After Na3PO4 pretreatment test, that carbonate and organic matters fractions reduce and increase residual fraction.The results indicate that the immobilization efficiency of PDTC in treating with bottom ash is higher than Na2S and Na3PO4. The immobilization efficiencie of 0.2 % APDC pretreatment for 1day is over 97%. Immobilization of four agents pretreatments for 1day are more efficiency than short-time pretreatments. According to the extraction results of Cu extracted from MSWI bottom ash by 0.2M EDTA, extraction efficiencies of Cu of MSWI bottom ash were 20%. EDTA extraction could decrease the content of Cu, lower impact of Cu to the environment, and make the bottom ash mor environment friendly.
URI: http://hdl.handle.net/11455/25616
其他識別: U0005-1908201310445400
Appears in Collections:土壤環境科學系

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