| 都市垃圾焚化底灰通常以一般廢棄物逕行處理,但文獻指出,細粒徑之灰渣有重金屬含量 |
| 較高之趨勢,具有相當之危害潛勢,故底灰若判定為無害性時,併同一般廢棄物進入衛生 |
| 掩埋場進行最終處置,對於未來污染問題值得堪慮。 |
| 本研究主要對底灰重金屬Pb、Zn、Cu、Cr、Cd做分析,探討其總量、溶出率及鍵結型態, |
| 再進行磷酸及磷酸鹽穩定化之研究,找出穩定化最佳條件,並進而探討底灰重金屬溶出潛 |
| 勢。 |
| 由實驗結果可知,重金屬含量及溶出率與底灰粒徑無明顯關係,其中溶出率與pH值有關。 |
| 其底灰中重金屬之鍵結型態經序列萃取實驗結果可知,Pb、Zn、Cu、Cd皆以碳酸鹽結合態 |
| 含量最多,Cr則多為殘留態。經磷酸根溶液穩定化後重金屬鍵結型態皆有自易溶出型態轉 |
| 移至不易溶出型態之趨勢,而穩定化之最佳條件為0.25 M磷酸穩定溶液之濕式(L/S=5:1)處 |
| 理,在最佳條件下重金屬鍵結型態轉變至殘留態效果十分明顯;Pb、Cr於TCLP再溶出試驗 |
| 中無任何再溶出量,Zn、Cu則低於3 mg/L,皆符合TCLP法規標準;而穩定化廢液中重金屬 |
| 含量亦符合放流水標準;以XRD可鑑定出磷酸根與重金屬及Ca形成穩定之金屬磷酸鹽類及磷 |
| 礦石,而以SEM可明顯觀察到柱狀晶體之形成,故可確定磷酸根將重金屬穩定於底灰中。然 |
| ,底灰重金屬溶出潛勢相較於飛灰,雖底灰鍵結型態中易溶出型態含量高於飛灰,但TCLP |
| 溶出率因受pH值抑制不易溶出,但若pH值降低,則底灰重金屬溶出量甚於飛灰,故穩定化 |
| 處理底灰中之重金屬仍有其必要性。 |
|
| [摘要] |
| Municipal solid waste (MSW) incinerator bottom ash was used to be disposed of |
| in the landfill directly, or be recovered to act as the aggregates in the |
| construction. However, according to the previous studies, heavy metals |
| leaching potential of the fine-particle MSW incinerator bottom ash was still |
| high. For the sake of the environmental safety, proper stabilization treatment |
| should be executed before its reuse or disposal. This research was focused on |
| the dissolution ratio and the bounded pattern of the heavy metals in the |
| bottom ash, including Pb, Zn, Cu, Cr and Cd. The experiments included the |
| phosphoric acid and phosphate stabilization treatment both in wet process and |
| dry process. The samples were analyzed by sequential extraction XRD, SEM, and |
| ICP analyzer. |
| The heavy metals leaching potential are affected by the pH value, but no |
| obvious relationship was observed between the dissolution ratio and particle |
| size. According to the sequential extraction procedure analysis, the mainly |
| bounded pattern of the Pb, Zn, Cu and Cd is bound to carbonates phase, while |
| Cr is bound to the residuals. After stabilized by phosphate solution, the |
| bounded pattern tends to changed from the easily dissolution states to the |
| difficult dissolution states. The best stabilization condition is wet |
| stabilization treatment (L/S=5:1) by 0.25 M phosphate solution and in this |
| condition the bounded fraction is changed to residual state. The concentration |
| of heavy metals is all pass the TCLP regulation and the wastewater are also |
| fulfills the effluent standard. The calcium ion and phosphate will form the |
| stabilized metal phosphate by XRD analysis identification. SEM analysis also |
| shows the pillar crystal forming on the surface. The dissolution ratio of |
| bottom ash is even higher than fly ash because of the operational pH of TCLP |
| experiment. The results showed that the heavy metals in the bottom ash could |
| be successfully stabilized with phosphoric acid or phosphate solution. |
|
| [論文目次] |
| 目 錄 |
| 摘要 |
| 目錄 Ⅰ |
| 表目錄 Ⅳ |
| 圖目錄 Ⅵ |
| 第一章 序論 |
| 1-1 研究動機 1-1 |
| 1-2 研究內容 1-2 |
| 第二章 文獻彙整 |
| 2-1 焚化底灰之種類與來源 2-1 |
| 2-2 焚化底灰之特性 2-2 |
| 2-2-1 底灰之物理性質 2-2 |
| 2-2-2 底灰之化學特性 2-4 |
| 2-3 底灰中重金屬來源及特性 2-7 |
| 2-3-1 底灰中重金屬來源與分佈 2-7 |
| 2-3-2 重金屬鍵結型態 2-10 |
| 2-4 添加磷酸或磷酸鹽穩定重金屬之研究 2-15 |
| 2-4-1 磷酸鹽與重金屬之反應 2-15 |
| 2-4-2 以磷酸處理重金屬之相關研究 2-17 |
| 第三章 實驗材料與研究方法 |
| 3-1 實驗藥品與材料 3-1 |
| 3-1-1 實驗藥品 3-1 |
| 3-1-2 實驗材料 3-2 |
| 3-2 實驗與分析設備 |
| 3-2-1 基本實驗設備 3-3 |
| 3-2-2 實驗分析設備 3-3 |
| 3-3 實驗材料準備 3-5 |
| 3-4 實驗流程 3-6 |
| 3-5 實驗方法 3-7 |
| 3-5-1 底灰之基本性質檢測項目與方法 3-7 |
| 3-5-2 以序列萃取探討重金屬鍵結型態之實驗 3-9 |
| 3-5-3 添加不同濃度磷酸與磷酸鹽萃取穩定重金屬之實驗 3-11 |
| 3-5-4 穩定底灰與穩定化後廢液重金屬之特性分析實驗 3-12 |
| 3-5-5 高濃度重金屬外添加之分析實驗 3-13 |
| 3-5-6 實驗配置 3-13 |
| 第四章 研究結果與討論 |
| 4-1 底灰物理性質分析 4-1 |
| 4-2 底灰化學特性分析 4-3 |
| 4-2-1 主要組成元素分析 4-3 |
| 4-2-2 不同粒徑底灰之組成成份分析 4-4 |
| 4-2-3 底灰重金屬含量與粒徑之關係 4-7 |
| 4-2-4 底灰重金屬TCLP溶出量與粒徑之關係 4-9 |
| 4-2-5 不同粒徑底灰重金屬鍵結型態 4-13 |
| 4-2-6 底灰之顯微結構與物種分析 4-16 |
| 4-3 磷酸溶液穩定之底灰重金屬特性 4-18 |
| 4-3-1 磷酸及磷酸鹽溶液穩定之底灰重金屬型態變化 4-18 |
| 4-3-2 磷酸及磷酸鹽溶液穩定之底灰重金屬物種鑑定及微 |
| 觀分析 4-26 |
| 4-3-3 磷酸及磷酸鹽溶液穩定之底灰重金屬再溶出分析 4-34 |
| 4-3-4 磷酸及磷酸鹽溶液穩定化後廢液之重金屬含量分析 4-36 |
| 4-4 底灰重金屬溶出潛勢分析 4-38 |
| 4-4-1 底灰與飛灰重金屬硝酸消化總量及溶出率比較 4-38 |
| 4-4-2 底灰與飛灰重金屬型態分布比較 4-39 |
| 第五章 結論與建議 |
| 5-1 結論 5-1 |
| 5-2 建議 5-3 |
| 參考文獻 R-1 |
| 附錄A 實驗數據 A-1 |
| 附錄B 實驗圖譜 B-1 |
| 表 目 錄 |
| 表2.1 都市垃圾焚化底灰元素組成 2-6 |
| 表2.2 焚化系統中重金屬化合物之型態與分佈 2-8 |
| 表2.3 各國焚化底灰與重金屬含量之關係 2-8 |
| 表2.4 底灰粒徑與重金屬溶出之相關性 2-9 |
| 表2.5 常見之溶出/萃取方法 2-11 |
| 表2.6 重金屬各鍵結型態之移動性 2-14 |
| 表2.7 鉛礦物之化學式及溶解度積 2-16 |
| 表2.8 不同pH下,磷礦石與重金屬鉛形成之新固相物種 2-16 |
| 表3.1 實驗藥品 3-1 |
| 表3.2 實驗材料器具 3-2 |
| 表3.3 ASTM標準篩規格 3-5 |
| 表3.4 實驗操作參數 3-12 |
| 表3.5 底灰物理特性分析之實驗配置Ⅰ- A 3-14 |
| 表3.6 底灰穩定前後重金屬硝酸消化與其TCLP溶出量分析 |
| 之實驗配置Ⅱ- A 3-14 |
| 表3.7 底灰穩定前後重金屬硝酸消化與其TCLP溶出量分析 |
| 之實驗配置Ⅱ- B 3-14 |
| 表3.8 穩定液之重金屬含量分析實驗配置Ⅲ- A 3-14 |
| 表3.9 穩定液之重金屬含量分析實驗配置Ⅲ- B 3-15 |
| 表3.10 穩定灰TCLP再溶出分析實驗配置Ⅳ- A 3-15 |
| 表3.11 穩定灰TCLP再溶出分析實驗配置Ⅳ- B 3-15 |
| 表3.12 底灰穩定化前後重金屬鍵結型態分析實驗配置Ⅴ- A 3-15 |
| 表3.13 底灰穩定化前後重金屬鍵結型態分析實驗配置Ⅴ- B 3-15 |
| 表3.14 底灰穩定化前後重金屬鍵結型態分析實驗配置Ⅴ- C 3-15 |
| 表3.15 底灰主成份分析實驗配置Ⅵ- A 3-16 |
| 表3.16 底灰穩定前後之顯微結構及物種變化之分析 |
| 實驗配置Ⅶ- A 3-16 |
| 表3.17 底灰穩定前後之顯微結構及物種變化之分析 |
| 實驗配置Ⅶ- B 3-16 |
| 表4.1 四批底灰之含水率 4-1 |
| 表4.2 底灰之灼燒減量與pH值 4-2 |
| 表4.3 粒徑分析後之底灰重量百分比 4-3 |
| 表4.4 焚化底灰XRD判讀之可能主要物種 4-5 |
| 表4.5 底灰TCLP萃後萃餘廢液之pH值 4-12 |
| 表4.6 混合粒徑底灰中重金屬鍵結型態趨勢 4-15 |
| 表4.7 細粒徑底灰之微量區間元素組成分析 4-18 |
| 表4.8 磷酸濕式處理後重金屬穩定化之百分比 4-21 |
| 表4.9 磷酸半乾式處理後重金屬穩定化之百分比 4-22 |
| 表4.10 磷酸鹽濕式處理後重金屬穩定化之百分比 4-26 |
| 表4.11 磷酸與磷酸鹽穩定化效果百分比之比較(L/S=5:1) 4-28 |
| 表4.12 穩定化前後底灰重金屬鍵結型態變化比較 |
| (L/S=5:1, 0.25 M) 4-29 |
| 表4.13 穩定化廢液之重金屬含量 4-32 |
| 表4.14 0.25 M之磷酸穩定灰可能形成之新晶相物種 4-36 |
| 表4.15 穩定化前後底灰之微量區間元素組成分析 4-43 |
| 表4.16 底灰與飛灰之重金屬總量、TCLP與溶出率比較 4-44 |
| 表4.17 飛灰與底灰之重金屬各鍵結型態分佈比較 4-46 |
| 圖 目 錄 |
| 圖2.1 重金屬穩定化及溶出機制示意圖 2-9 |
| 圖3.1 實驗流程圖 3-6 |
| 圖3.2 氫氟酸試驗流程 3-8 |
| 圖3.3 序列萃取(Sequential Extraction Procedure)流程圖 3-10 |
| 圖4.1 粒徑分析後之底灰重量百分比 4-3 |
| 圖4.2 底灰主要元素不同粒徑之分佈趨勢 4-4 |
| 圖4.3 各粒徑之XRD物種分析 4-6 |
| 圖4.4 篩分之底灰重金屬硝酸消化總量與TCLP溶出值 4-8 |
| 圖4.5 底灰不同粒徑之硝酸消化、氫氟酸總量消化與 |
| TCLP溶出量之比較之比較 4-11 |
| 圖4.6 四批底灰之重金屬TCLP溶出率趨勢比較 4-13 |
| 圖4.7 各粒徑底灰重金屬鍵結型態之分佈 4-15 |
| 圖4.8 混合粒徑底灰之顯微結構 4-17 |
| 圖4.9 磷酸濕式(L/S=5:1)處理重金屬穩定至不易移動型態之 |
| 百分比 4-21 |
| 圖4.10 磷酸濕式(L/S=5:1)穩定化底灰之重金屬再溶出量 4-21 |
| 圖4.11 磷酸半乾式(L/S=3:10)處理重金屬穩定至不易移動型態之 |
| 百分比趨勢 4-22 |
| 圖4.12 磷酸半乾式(L/S=3:10)穩定化底灰之重金屬再溶出量 4-22 |
| 圖4.13 磷酸穩定化底灰重金屬於各鍵結型態之分佈 |
| (L/S=5:1, L/S=3:10) 4-23 |
| 圖4.14 磷酸鹽濕式(L/S=5:1)處理重金屬穩定至不易移動型態之 |
| 百分比趨勢 4-26 |
| 圖4.15 磷酸鹽濕式(L/S=5:1)穩定化底灰之重金屬再溶出量 4-26 |
| 圖4.16 磷酸鹽穩定化底灰重金屬於各鍵結型態之分佈 |
| (L/S=5:1) 4-27 |
| 圖4.17 磷酸與磷酸鹽穩定化效果比較(L/S=5:1, 0.25 M) 4-28 |
| 圖4.18 磷酸與磷酸鹽穩定化底灰重金屬各鍵結型態之分佈 |
| (L/S=5:1, 0.01 M , 0.1 M , 0.25 M) 4-29 |
| 圖4.19 磷酸穩定化廢液之重金屬含量趨勢 4-33 |
| 圖4.20 磷酸鹽穩定化廢液之重金屬含量趨勢 4-33 |
| 圖4.21 底灰經磷酸穩定化前後重金屬鍵結型態之比較 |
| (0.25M H3PO4, L/S=5:1,) 4-34 |
| 圖4.22 穩定化底灰重金屬Pb之XRD物種分析 4-37 |
| 圖4.23 穩定化底灰重金屬Zn之XRD物種分析 4-38 |
| 圖4.24 穩定化底灰重金屬Cu之XRD物種分析 4-39 |
| 圖4.25 穩定化底灰重金屬Cr之XRD物種分析 4-40 |
| 圖4.26 0.25M H3PO4 , L/S=5:1穩定灰之顯微結構 4-41 |
| 圖4.27 0.5 M H3PO4 , L/S=3:10穩定灰之顯微結構 4-42 |
| 圖4.28 0.1M Na2HPO4 , L/S=5:1穩定灰之顯微結構 4-42 |
| 圖4.29 本實驗底灰與文獻飛灰重金屬總量比較 4-45 |
| 圖4.30 本實驗底灰與文獻飛灰重金屬TCLP溶出量比較 4-45 |
| 圖4.31 飛灰與底灰之重金屬各鍵結型態分佈比較 4-46 |
| 圖4.32 未穩定化底灰與文獻飛灰之易移動型態重金屬之比較 4-47 |
|
| [參考文獻] |
| Bradley S. Crannella, T. Taylor Eighmya, James E. Krzanowskib, J. Dykstra |
| Eusden Jr.c,, Elisabeth L. Shawd, Carl A. Francise, “Heavy metal stabilization |
| in municipal solid waste combustion bottom ash using soluble phosphate”, |
| Waste Management Vol.20, pp. 135-148, 2000. |
| Buchollz, B. A. and S. Landsberger, “Trace Metal Anyalsis of Size Fraction of |
| Municipal Solid Waste Incinerator Fly Ash and Its Leaches”,Journal of |
| Environmental Science and Health, A.28, pp. 423-441, 1993. |
| Clapp, T. L., Magee, J. F., Ahlert, R. C., Kosson, D. S., “Municipal Solid |
| Waste Composition and the Behavior of Metals in Incinerator Asfes”, |
| Environmental Progress,7(1), pp.22~29, 1988. |
| Fernandez, M. A., Martines, L., Segarra, M., Garcle, C. J., Esplell, F., “ |
| Behavior of heavy Metals in the Combustion of Urban Waste Incinerator”, |
| Environmental Science and Technology, Vol.26(5), pp.1040-1047, 1992. |
| Ferrell, R. E., “Characterization of Lead and Other Heavy Metals in Fly Ash |
| from Municipal Waste Incinerators”, Hazardous Waste & Hazardous Materials, |
| Vol.8(4), pp.275~292, 1991. |
| Johnson, C.A., Kersten, M., Ziegler, F., Moor, H.C., “Leaching Behavior and |
| Solubility – Controlling Solid Phases of Heavy Metals in Municipal Solid |
| Waste Incinerator Ash”, Waste Management, Vol.16, No.1-3, pp.129-134, 1996. |
| Kosson, D. S., H. A. Sloot and T. T. Eighmy, “An Approach for Estimation of |
| Contaminant Release During Utilization and Disposal of Municipal Waste |
| Combustion Residues”, Journal of Hazardous Materials, Vol.47, pp.43-75 , 1996. |
| McBride NW, “I Environmental chemistry of soils”, New York: Oxford |
| University Press, 1990. |
| Mckinley, M. D., Warren, G. W., Lahoti, S. M, Kandipati, S., “Stabilation and |
| Hydromentallurgical Treatment of Fly Ash from a Municipal Incinerator”, J. |
| Hazardous Materials,vol.29, pp.255~273, 1992. |
| Means, J.L., Smith, L.A., Nehring, K.W., Brauning, S.E., Gavaskar, A.R., Sass, |
| B.M., Wiles, C.C., Mashni, C.I., “The Application of Solidification / |
| Stabilization to Waste Materials”, Lewis Publishers, 1995. |
| Michael V. Ruby, “In Situ Formation of Lead Phosphates in Soils as a Method |
| to Immobilize Lead”, Environmental Science and Technology, Vol.28, pp.646- |
| 654, 1994. |
| Nriagu JO. “Formation and stability of base metal phosphates in soils and |
| sediments.” In: Nriagu JO, Moore PB, edits. Phosphate minerals. Berlin: |
| Springer-Verlag, pp. 318-329, 1984. |
| Panda A, Sahu B, Patel PN, Mishra B., “Calcium-lead-copper and Calium-lead- |
| cadmium hydroxylapatite solid solutions: preparation, infrared and lattice |
| constant measurements”. Transition Meteorology chemical, Vol.16, pp.476, 1991. |
| Pfrang-Stotz, G., and Schneider, J., “Comparative Studies of Waste |
| Incineration Bottom Ashes from Various Grate and Firing Systems, Conducted |
| with Respect to Mineralogical and Geochemical Methods of Examination”, Waste |
| Management & Research, Vol.13, pp.273-292 , 1995. |
| Saroahi Mizutani, Hans A. van der Sloot, Shin-ichi Sakai, evaluation of |
| treatment of gas cleaning residues from MSWI with chemical agents, Waste |
| management, Vol.20, pp.233-240, 2000 |
| Sawell, S. E., Bridle, T. R., & Constable, T. W., “Heavy Metal Leachability |
| from Solid Waste Incinerator Ashes”, Waste Management & Research, Vol. 8 pp. |
| 227-238, 1988. |
| Shigeru Sugiyama, Takuya Ichii, Hiromu Hayashi, and Tahei Tomida, “Lead |
| immobilization by non-apatite-type calcium phosphates in aqueous solutions”, |
| Inorganic Chemistry Communications, Vol.5, pp.156-158 , 2002. |
| T. Taylor Eighmy, Bradley S. Crannell, James E. Krzanowski, Leslie G. Butler, |
| Frank K. Cartledge, Earl F. Emery, J. Dykstra Eusden Jr, Elisabeth L. Shaw, |
| Carl A. Francis, “Characterization and phosphate stabilization of dusts from |
| the vitrification of MSW combustion residues”, Waste Management,Vol.18, pp. |
| 513-524, 1998. |
| Tessier, A.; P. G. C. Campbell and M. Bisson “Sequential extraction procedure |
| for the speciation of particulate trace metals”, Analytical Chemistry, Vol. |
| 51, NO.7, pp.844-850, 1979. |
| Ure, A. M., “Single extraction schemes for soil analysis and related |
| applications”, The Science of Total Environment. Vol.178, pp.3-10, 1996. |
| Valerie Laperche, “Chemical and Mineralogical Characterizations of Pb in a |
| Contaminated Soil: eactions with Synthetic Apatite”,Environmental Science |
| and Technology, Vol.30, pp.3321-3326, 1996. |
| Wiles, C.C., “Municipal Solid Waste Combustion Ash: State-of-the-Knowledge”, |
| Journal of Hazardous Materials, Vol.47, pp.325-344, 1996. |
| Xu Y, Schwartz FW, Traina SJ. “Sorption of Zn2+ and Cd2+ on hydroxyapatite |
| surface”. Environmental Science and Technology, Vol.28, pp.1472-1480, 1994. |
| 吳慶隆,“焚化底灰粗粒徑替代道路基層材料之可行性探討”,淡江大學水資源及環境工 |
| 程研究所碩士論文,2001。 |
| 李釗、江少鋒、郭文田,“垃圾焚化底灰做為水泥混凝土細骨材之可行性研究”,第十屆 |
| 廢棄物處理技術研討會,pp.122-128,1995。 |
| 汪建民,“材料分析”,中國材料學會,1998。 |
| 林健榮、張祖恩、盧明俊、丁婉屏、徐佩怡、許佩瑜、郭子豪,“都市垃圾焚化灰渣中重 |
| 金屬鍵結總類與溶出特性”, 第十四屆廢棄物處理技術研討會,pp.4-30~4-36,1999。 |
| 林鴻祺、江東法、廖明村,“一般廢棄物焚化灰渣處理處置及再利用技術探討”,一般廢 |
| 棄物焚化灰渣資源化技術與實務研討會,pp.69-85,1996。 |
| 孫常榮、劉建良、張君偉、王鯤生,“都市垃圾焚化飛灰重金屬溶出之化學性分析”,第 |
| 十四屆廢棄物處理技術研討會,pp.7-38~7-49,1999。 |
| 張祉祥,“都市垃圾焚化底灰燒結材料化之研究”,第十四屆廢棄物處理技術研討會論文 |
| 集,1999。 |
| 張晉魁,“燃煤飛灰中金屬溶出潛力之研究”,國立中興大學環境工程學系碩士論文 |
| ,2002。 |
| 張祖恩、蔡敏行、蔡尚林、林健榮,“臺灣地區都市垃圾焚化灰渣物化組成與溶出特性探 |
| 討”,一般廢棄物焚化灰渣資源化技術與實務研討會,pp.227~254,1996。 |
| 張添晉,“有害廢棄物焚化系統中金屬分佈之模式分析”,工業污染防治,23期,pp.112~ |
| 123,1987。 |
| 陳錕榮、洪肇嘉,“重金屬污染場址調查與復育技術評估之研究”,第十五屆廢棄物處理 |
| 技術研討會論文集,pp.2-193~2-199,2000。 |
| 黃依典、周耀鑾,“土木材料(第五版)”,專上圖書有限公司,1995。 |
| 楊金鐘、吳裕民,“垃圾焚化灰渣穩定化產物在利用之可行性之探討”,一般廢棄物焚化 |
| 灰渣資源化技術與實務研討會,pp.43~68,1996。 |
| 廖秋榮、李宜蓁,“磷礦石對幾種台灣土壤中鉛形態分佈之研究”,第十五屆廢棄物處理 |
| 技術研討會論文集,pp.2-129~2-135,2000。 |
| 蔡啟明,”垃圾焚化飛灰之萃取特性研究及電解回收重金屬之研究”,國立中山大學環境 |
| 工程研究所碩士論文,1996。 |
| 鄭文欽,“都市垃圾焚化底灰受鹽類影響重金屬釋出之研究”,淡江大學水資源及環境工 |
| 程研究所碩士論文,1996。 |
|