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年度	110	專案性質	實驗性質
專案類別	研究專案	研究主題	整治
申請機構	國立臺北科技大學	申請系所	資源工程研究所
專案主持人	丁原智	職等/職稱	教授
專案中文名稱	以無機聚合技術整治重金屬污染土壤技術研究
中文關鍵字	無機聚合, 重金屬, 污染土壤
專案英文名稱	The study on the treatment of hevay metal contaminated soil using geopolymerization technology
英文關鍵字	geopolymerization, hevay metal, contaminated soil
執行金額	500,000元
執行期間	2021/1/1 至 2021/12/31
計畫中文摘要	本研究之目的是以無機聚合技術整治受重金屬污染土壤。目前固化處理為最常見受重金屬污染土壤的處理方式。此固化處理技術僅為物理的包覆而使污染物無法移動，被污染土壤最終還是必須進入事業廢棄物掩埋場進行分區掩埋。由於無機聚合物是由富含矽鋁酸鹽的材料(例如飛灰，水淬爐石粉)與鹼金屬氫氧化物、矽酸鹽水溶液反應生成，並形成三維結構。因此使用無機聚合技術可使土壤中重金屬離子在聚合反應中鍵結並進入固化體結構中，使其不再溶出。此一技術可使無機聚合固化之土壤具有再利用之機會。 本研究之無機聚合物是以受重金屬污染土壤、燃煤飛灰、水淬高爐石粉及鹼液為原料，在常溫下以固定比例混合反應而成。聚合/固化之污染土壤來源為經環保主管機關公告為污染場址。本計畫選取宜蘭縣一公告污染場址作為整治目標並進行土壤採取作為固化原料。此場址內土壤所含超過管制之重金屬離子為鋅及銅，另還有少量未超過標準值之鉛離子。 實驗設計可分為兩大項。第一項為不同原料比例對固化重金屬能力進行分析評估。原料包含受污染土壤(Md)、水淬高爐石粉(Sg)及燃煤飛灰(FA)。第一組為飛灰、爐石粉與土壤依不同比例混合進行聚合固化。第二組僅以不同比例爐石粉與土壤進行重金屬固化。實驗步驟為將混合物與鹼金屬水溶液攪拌5分鐘後將漿體灌入模具中，以室溫養護7、14、28天。依據實驗分析結果(TCLP、機械及物性質)與實驗配比進行交叉比對。第二項為不同鹼液配比對固化重金屬能力分析。規劃七組(含一組對照組)實驗。NaOH莫耳濃度為4M、6M、8M；SiO2/Na2O莫耳比為0.96、1.28、1.91；SiO2/Al2O3莫耳比為0、50、70)。 實驗結果顯示，以無機聚合技術整治受重金屬污染之土壤，原料最佳配比Md：Sg：FA為60：40：0。此材料抗壓強度於齡期14天達到46.64 MPa，28天為47.66MPa。且在固化重金屬離子達到預期效果，僅有少量約12 ppm銅溶出，其他重金屬離子皆未檢測到溶出。鹼液最佳配比NaOH莫耳濃度為8M、SiO2/Na2O莫耳比為0.96、SiO2/Al2O3莫耳比為1.28。在此鹼液參數下搭配原料Md：Sg：FA為60：40：0配比，養護14天強度可達到49.37 MPa、 28天為58.63 MPa。且此材料能有效穩定化重金屬離子，以原始公告受重金屬Zn污染達4580 ppm、Cu污染達2240 ppm之土壤，在經過此穩定化試驗後，並未檢測出有重金屬離子溶出。
計畫英文摘要	The propose of this study is to use geopolymerization technique to treat the heavy metal contaminated soil. Currently solidification process is the most commonly used method used to treat heavy metal contaminated Soil. However, solidification can only immobilize the heavy metal in its matrix and eventually be treated as landfill material. Through geopolymerization process, he heavy metal ions can be bonded into structure matrix and be immobilized. The heavy metal contaminated soil was collected from contaminated site announced by EPA that contained zinc, copper and lead heavy metals. The experimental designed can be divided into two categories. The first one is to adjust the mixing ratio of contaminated soil (Md), ground granulated blast furnace slag (Sg) and fly ash (FA) to prepare geopolymer specimens. The mixture was first mixed with alkali solution for 5mins before pouring into the cylindrical mould. The specimens were then cured in ambient environment for 7,14 and 28days. The mechanical and physical properties of the specimens were tested along with TCLP test. The second part of the experiment is to adjust the content of alkali solutions. The 4M、6M、8M NaOH was used to prepare alkali solutions with the addition of sodium silicate and aluminum silicate (SiO2/Na2O molar ratios of 0.96、1.28、1.91 and SiO2/Al2O3 molar ratios of 0、50、70 ). According to experimental results obtained in this study, the optimum mixing ratio of Md：Sg：FA is 60：40：0. The compressive strength of the specimen prepare are 46.64MPa and 47.66MPa after 14days and 28 days of curing, respectively. The TCLP test shows only 12ppm copper ions were detected. The optimum alkali solution is the solution prepared with 8M NaOH that have SiO2/Na2O molar ratio of 0.96 and SiO2/Al2O3 molar ratio of 50. The specimens prepared with 60% Md and 40% Sg and activated by such solution have compressive strength of 49.37MPa and 58.63MPa after 14days and 28days curing. The TCLP test shows no heavy metal ions dissolved.