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年度	108	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	國立暨南國際大學	申請系所	土木工程學系
專案主持人	陳谷汎	職等/職稱	教授
專案中文名稱	綠色洗劑對不同重金屬污染土壤之清洗成效評估：以聚麩胺酸為例
中文關鍵字	重金屬,聚麩胺酸,土壤質地,綠色洗劑,鍵結型態,廢水處理
專案英文名稱	Evaluation of heavy metal removal efficiency from contaminated soil by green washing agent: take γ-PGA as an example
英文關鍵字	Heavy metal, polyglutamic acid (PGA), soil texture, green washing agent, bonding type, wastewater treatment
執行金額	700,000元
執行期間	2019/1/1 至 2019/11/30
計畫中文摘要	本研究選擇彰化與桃園不同受污染農地土壤(壤質砂土、紅壤、黃壤)，以綠色洗劑γ-PGA (poly-γ-glutamic acid)評估其對不同重金屬在不同性質土壤之去除效率，並評估γ-PGA清洗前後土壤性質、重金屬鍵結型態之變化。本研究主要目的為(1)評估γ-PGA 對土壤中不同重金屬之去除成效；(2)評估不同性質土壤對γ-PGA去除不同重金屬之影響；(3)評估γ-PGA清洗對土壤性質之影響；及(4)評估弱酸性條件對γ-PGA去除重金屬效率之影響。試驗土壤(黑壤、黃壤及紅壤)銅金屬含量已超過土壤污染管制標準的5.11、8.50及4.05倍。因此，後續試驗分析以銅金屬做為目標污染物，利用聚麩胺酸洗劑進行重金屬萃取試驗，探討各金屬之萃取效率。γ-PGA清洗劑對受重金屬污染之土壤(黑壤、紅壤及黃壤)Cu去除率為54.7-59.7 %。田口實驗結果顯示，黑壤於不同操作因子對Cu去除之影響分別為pH >清洗時間>濃度>水土比、黃壤及紅壤以清洗時間>濃度>水土比>pH。PGA重覆使用結果顯示，以同一洗劑清洗5批土壤時，黑壤中銅的去除率從66.4%降低至49.4%；紅壤中銅的去除率從52.8%降低至42.7%；黃壤中銅的去除率從60.7%降低至59.5%，顯示本洗劑具有重複使用之可行性。以NaOH調整pH處理γ-PGA清洗黑壤、黃壤及紅壤之廢水，當pH >10時，溶液中Cu去除率分別為56.4%、64%及31.8%，顯示提升pH對廢水中重金屬之移除具有相當之成效。整體研究成果顯示，γ-PGA對不同質地土壤之清洗皆具適用性。本研究發展一套迅速有效且環境友善之土壤清洗綠色整治技術，未來可提供受污染場址進行整治參考之用。此外，未來處理後廢水若能更進一步提升重金屬移除效率，將可於現地處理並再利用於農田中，達到洗劑完全利用之目標。 關鍵字:重金屬、聚麩胺酸、土壤質地、綠色洗劑、鍵結型態、廢水處理
計畫英文摘要	In this study, black, red, and yellow soils of different contaminated agricultural land from Changhua County and Taoyuan City were treated by green γ-PGA (poly-γ-glutamic acid). The soil properties, heavy metal bonds before and after γ-PGA washing, and changes of microbial patterns were evaluated. The aims of this study were to: (1) evaluate the removal efficiency on different heavy metals in the soil by γ-PGA; (2) evaluate the effects of different soils on the removal of different heavy metals by γ-PGA; (3) evaluate the effect of different heavy metal boding types on the removal efficiency of heavy metals by γ-PGA; and (4) evaluate the effect of weak acidic conditions on the efficiency of heavy metal removal by γ-PGA. The results show that γ-PGA is able to remove Cr, Ni, Cu, and Zn . Cu removal in black, red, and yellow soil by γ-PGA reached 54.7, 58.7, and 59.7%, respectively. The effect of different parameters on heavy metal removal of black soil follow the sequence of pH > washing time > γ-PGA concentration > water/soil ratio. The effect of different parameters on heavy metal removal of red and yellow soil follow the sequence of washing time > γ-PGA concentration > water/soil ratio > pH. When pH is adjusted to above 10, the removal efficiency of Cu in wastewater from black, yellow, and red soil washing reached 56.4, 64, and 31.6%, respectively, indicating that the increase in wastewater pH can remove Cu effectively. The results show that γ-PGA is an effifcient washing reagent for the treatment of contaminated soil with defferent textures. The results of this study can provide valuable information for site remediation in the future. Keywords: Heavy metal, polyglutamic acid (PGA), soil texture, green washing agent, bonding type, wastewater treatment