| 研究生: |
段宇君 Tuan, Yeu-Juin |
|---|---|
| 論文名稱: |
實驗室廢棄物焚化灰渣及電漿熔渣之毒性物質研究 Tracking of toxic species in laboratory waste incineration ashes and plasma melting slags |
| 指導教授: |
王鴻博
Wang, H. Pual |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
工學院 - 環境工程學系 Department of Environmental Engineering |
| 論文出版年: | 2012 |
| 畢業學年度: | 100 |
| 語文別: | 英文 |
| 論文頁數: | 136 |
| 中文關鍵詞: | 飛灰 、熔渣 、焚化 、電漿熔融 、洗灰 、XANES 、DEA |
| 外文關鍵詞: | ash, slag, incineration, plasma melting, ash washing, XANES, DEA |
| 相關次數: | 點閱:78 下載:3 |
| 分享至: |
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實驗室廢棄物焚化灰渣(ashes),因含毒性重金屬與戴奧辛(polychlorinated dibenzo-p-dioxins and dibenzofurans, PCDD/Fs)被視為有害廢棄物。焚化灰渣可以電漿熔融高溫安定化(1673-1773 K)生成熔渣(slag)。由於目前焚化灰渣及電漿熔渣之有害物質化學結構資料仍相當缺乏,因此,針對焚化灰渣及電漿熔渣中之有害物質(銅、鉻及PCDD/Fs)之安定化進行研究。尤其利用XANES,XAFS及XRD等光譜所獲得之分子尺度結果及數據,可更深入瞭解灰渣及熔渣中有害物質的物種及化學結構。
研究結果顯示CuO及CuSO4分別為焚化底渣及飛灰中主要之銅化合物。經電漿熔融處理後,金屬銅(76%)及Cu2O(15%)則為熔渣中之主要成分。此外,CuSiO2也在熔渣中發現,顯示銅可能被侷限(encapsulated)在SiO2晶格中,也是造成熔渣TCLP濃度相對低之原因,熔渣中以低氧化數銅(CuCl及Cu2O)及鉻(Cr及Cr2O3)為主。
為瞭解銅化合物對於灰渣中PCDD/Fs生成之影響,尤其在焚化煙道氣(flue gas)冷卻塔中灰渣之CuO及CuSO4比例及PCDD/Fs濃度進行關聯性研究。由焚化實廠數據之分析結果顯示,PCDD/Fs生成濃度可能與灰渣中CuO含量相關,而CuSO4可能抑制灰渣中PCDD/Fs的生成。
灰渣水洗可減少實驗室廢棄物焚化灰渣之氯含量(降低80~90%)及重量(減少65~99%),經不同液固比(L/S = 2、5、10、與20)測試結果,也考量用水量少與氯含量去除相對高之條件,發現液固比為5較有利於水洗實務應用。
為評估焚化操作效能,收集各空污防制設備(包括:冷卻塔及袋式集塵器)灰渣中重金屬之補集量,利用Data Envelopment Analysis (DEA)進行評估作業,結果發現,控制一次與二次燃燒室溫度分別為1173-1273 K及1273-1373 K時,可獲得較佳操作效率。
由同步輻射X光吸收光譜所獲得之分子尺度數據,可提供實驗室廢棄物焚化及電漿熔融實廠操作改善重要資料,也可作為後續系統效能提升之參考。
Ashes, which contain relatively high levels of toxic metals (e.g., copper and chromium) and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), discharged from laboratory wastes incineration are considered hazardous. The incineration ashes have been thermally stabilized with high-temperature plasma-assisted melting at the temperatures of 1673-1773 K. Detailed chemical structure of the toxic species in the ashes and slag is still lack in the literature. Thus the main objective of this work was to track toxic species, specifically copper, chromium, and PCDD/Fs, during incineration and melting. To better understand speciation of the toxic compounds in ashes and slags, their molecule-scale data were obtain by X-ray absorption (fine structure (EXAFS), X-ray absorption near edge structure (XANES)) and X-ray diffraction (XRD) spectroscopic methods.
Experimentally, by X-ray absorption spectroscopy, it is found that CuO and CuSO4 are the main copper compounds in the bottom and fly ashes, respectively. After thermal stabilization with the plasma melting, mainly metallic copper (Cu) (76%) and Cu2O (15%) are found in the slag. CuSiO2 is also observed, suggesting that copper may be encapsulated in the SiO2 matrix, which leads to formation of the thermally stable slag with a relatively low TCLP concentration of copper. The copper and chromium TCLP concentrations of slags sampled from the plasma melting reaction chamber are below the limit of Taiwan EPA. Low oxidation-state copper and chromium such as CuCl, Cu2O, Cr2O3 and Cr are found in the slag.
To learn how copper species play the key role in the formation of the relatively high PCDD/F concentrations in ashes, correlations of concentrations and fractions of CuO and CuSO4 with concentrations of PCDD/Fs in the cooling towers and baghouse filter ashes has been studied. The correlation between total concentrations of PCDD/Fs and fractions and concentrations of CuO or CuSO4 in the ash obtained from the commercial-scale incineration data suggest that the high PCDD/F concentrations may be associated with CuO in the ashes. Copper as CuSO4 can depress formation of PCDD/Fs in the ashes.
By washing, chloride contents and weight of incineration ashes can be reduced by 80-90% and 65-99%, respectively. Under liquid/solid (L/S) ratio of 5, low water consumption and relatively high chloride removal efficiency for ash washing is engineering feasible.
The incineration operation efficiency can be evaluated by effective capture of toxic metals in cooling towers and baghouse ashes. By data envelopment analysis (DEA), it is clear that the better operation temperature of the 1st and 2nd combustion chambers, are 1173-1273 and 1273-1373 K, respectively, which is to be applied in the practical operation.
It is also worth noting that the molecule-scale data obtained from synchrotron X-ray absorption spectra are well correlated with the findings from the full-scale laboratory waste incineration operation, which may be useful in process improvements.
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