Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5023
標題: 焚化過程中重金屬之控制研究
The Control of Heavy Metals in the Incineration Process
作者: 陳志成
Chen, Jyh-Cherng
關鍵字: Incineration;焚化;Heavy Metal;Adsorption;Sorbent;Thermodynamic Equilibrium Analysis;Dynamic Adsorption;重金屬;吸附控制;吸附劑;熱力平衡模擬;動力吸附
出版社: 環境工程學系
摘要: 
本研究主要針對焚化過程中重金屬之控制,利用不同固體吸附劑探討重金
屬之吸附效果及其相關影響因子,並針對吸附劑與重金屬之間高溫吸附特
性,包括動力吸附行為、吸附飽和特性與熱脫附加以探討,最後綜合以上
吸附實驗結果並配合熱力平衡模擬、吸附生成物種鑑定分析等資料,提出
吸附劑吸附重金屬之主要吸附機制,並對實際焚化過程中重金屬控制提出
幾點建議。研究結果指出含有矽、鋁、鈣氧化物之固體吸附劑可有效控制
焚化過程中重金屬的排放,惟不同吸附劑對不同重金屬之吸附效果有所差
異性,整體而言,石英砂與石灰石混合吸附劑對鉻、銅之吸附效果較好,
而吸附劑bauxite則對鉛、鎘之吸附效果較好。吸附效果的好壞主要取決
於吸附劑與重金屬高溫反應特性、重金屬揮發特性、進料物種元素組成、
焚化操作溫度等因子;且吸附劑的添加除了增加重金屬於砂床中的分佈比
例,亦可增加重金屬形成或附著於較大粒徑飛灰的比例,增加焚化系統空
氣污染防治設備對重金屬之整體去除效率。石灰石與石英砂混合吸附劑對
低揮發性重金屬鉻、銅之吸附機制主要為化學吸附反應或高溫熔融結合反
應,產生穩定之金屬矽氧化物或金屬鈣氧化物;對於高揮發性重金屬鎘而
言,其吸附機制主要為物理性氣固異相分子吸附作用,以及金屬物種本身
的冷凝、凝聚等成粒作用;對於中等揮發性之重金屬鉛,其吸附特性則是
介於以上兩者化學性與物理性作用之間,兩種吸附反應對重金屬鉛之吸附
效果皆有重要影響力。此外,藉由熱力平衡模式與吸附物種鑑定發現,部
份重金屬與吸附劑發生化學反應生成穩定化合物,如Na2CrO4(s)、CuO*
Cr2O3(s)、CaO*Cr2O3、CuO*Al2O3(s)、PbSiO

The object of this study is to investigate the control
efficiency of different sorbents on the heavy metal emission
during incineration processes. The adsorption characteristics of
heavy metals at high temperatures, included the dynamic
adsorption behaviors, adsorption saturation value, and thermal
desorption efficiency, were also studied. With the results of
thermodynamic equilibrium modeling and the identification of
reaction products, the adsorption mechanisms of heavy metals on
sorbent were addressed. TThe results showed that the solid
sorbents containing silica, aluminum, or calcium could
effectively decrease the emission of heavy metal during
incineration processes. Different sorbent had respective
adsorption efficiency on different metals. On the whole silica
and limestone mixture had better adsorption efficiency on Cr and
Cu, and bauxite was the best sorbent to capture Pb and Cd. The
adsorption efficiency depends on the reaction potential of
sorbent and metals, the volatility of metals, the feed wasteFor
the sorbent of silica and limestone mixture, the major
adsorption mechanism of less volatile metals Cr and Cu is
chemical adsorption or high temperature sintering, and stable
compounds were produced. The major adsorption mechanism of high-
volatility metal Cd is physical adsorption processes, such as
heterogeneous molecular adsorption, condensation, coagulation,
and sedimentation. For medium-volatility metal Pb, the
adsorption mechanism includes chemical reaction and physical
processes. From the results
URI: http://hdl.handle.net/11455/5023
Appears in Collections:環境工程學系所

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