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年度	102	專案性質	實驗性質
專案類別	研究專案	研究主題	底泥
申請機構	國立中山大學	申請系所	新興污染物研究中心
專案主持人	楊金鐘	職等/職稱	教授
專案中文名稱	後勁溪底泥中之鄰苯二甲酸酯類殘留量調查及其利用新穎組合技術現地整治之可行性研究
中文關鍵字	底泥；鄰苯二甲酸酯類；奈米級四氧化三鐵；過硫酸鹽；電動力整治
專案英文名稱	Investigation of phthalate residues in the sediment of Houjing River and its remediation feasibility study by a novel combined in situ technology
英文關鍵字	Sediment；Phthalate Esters；Nano-scale Fe3O4；Persulfate；Electrokinetic Remediation
執行金額
執行期間	2012/12/10 至 2013/12/9
計畫中文摘要	本研究計畫旨在調查後勁溪底泥中8種鄰苯二甲酸酯類及其11種代謝物之殘留 濃度，並嘗試利用奈米級 Fe3O4 活化過硫酸鹽氧化程序結合電動力法整治鄰苯二甲 酸酯類污染底泥，期盼未來建立一本土化可行的現地整治技術，以作為後續實場應 用。在後勁溪底泥中鄰苯二甲酸酯類及其代謝物之殘留濃度調查工作方面，已針對 選定之 7 個採樣點位進行 5 梯次採集底泥樣品，綜合調查結果發現，於底泥中可檢 出 4 種鄰苯二甲酸酯類及 6 種鄰苯二甲酸代謝物類之化合物，於楠梓溪支流三奶壇 橋處檢出 mg/kg 濃度 (ppm 濃度) 等級之 DEHP 殘留量，其平均濃度 (2886 µg/kg) 及最大濃度 (5477 µg/kg) 分別為「底泥品質指標之分類管理及用途限制辦法」之 管制下限值 1.46 倍及 3.69 倍。於鄰苯二甲酸酯類污染底泥整治工作方面，底泥反 應器所充填之底泥係採集自後勁溪德惠橋處，並分別於陰、陽極槽添加過硫酸鈉或 奈米級四氧化三鐵，施加定電壓 (1 V/cm 或 2 V/cm) 進行為期 14 日及 28 日期程之 6 組電動力試驗。試驗結果顯示：(1) 於陽極槽液中注入過硫酸鈉及奈米級四氧化 三鐵，並由電滲透流移向陰極端，同時藉由反應產生之 SO4 - ‧、OH‧及 H2SO5 等 強氧化劑，可將底泥中鄰苯二甲酸酯類予以降解；(2) 經由電動力第 1-2 組試驗 (空 白試驗) 組別發現，單純提高施加之電場強度 (1 V/cm → 2 V/cm)，亦有助於鄰苯 二甲酸酯類之去除，其詳細的去除機制有待進一步確認；及 (3) 本整治工法對於 鄰苯二甲酸酯類污染底泥整治過程，其鄰苯二甲酸酯類化合物在電極槽液之殘留 濃度極低 (ppt 濃度等級)。據此可知，本新穎整治工法確實可有效整治底泥中之鄰 苯二甲酸酯類。另外，本整治工法之操作成本粗估約在 12,000 元/噸以下，具經濟 可行性。由於本整治工法之最大優勢為可直接進行現地應用 (節省龐大的開挖工程 費用) 及針對黏土質地亦能有整治功效，因此，對於大規模現地整治鄰苯二甲酸酯 類污染底泥應具有很大很強的應用潛勢。
計畫英文摘要	The objectives of this study are two-fold: (1) to investigate the residual concentrations of eight phthalate esters (PAEs) and their 11 metabolites in sediment samples collected from the Houjing River; and (2) to develop and establish a localized, feasible in situ remediation technology coupling nano-Fe3O4/S2O8 2- process and electrokinetic process for the removal of PAEs in sediments of the Houjing River. To meet the first objective, five batches of sediment sampling were conducted at seven sampling sites along the Houjing River and four PAEs and six phthalate metabolites were detected. The order of parts per million (ppm) of residual di(2-ethylhexyl) phthalate (DEHP) was detected at Sannaitan Bridge. The relevant average concentration (2,886 µg/kg) and highest concentration (5,477 µg/kg) are 1.46 and 3.69 times greater than the “Regulations for Systematic Management of Quality Indices of Sediments and Their Use Restrictions” promulgated by Taiwan EPA. To meet the second objective, six tests with a remediation time of 14 days or 28 days were carried out using the electrokinetic-assisted nano-Fe3O4/S2O8 2- process under an electric field of 1 V/cm or 2 V/cm. Test results for the removal of PAEs in the sediment samples collected at Dehuei Bridge of the Houjing River are given as follows: (1) injection of sodium persulfate and nanoscale magnetite into the anode reservoir would yield SO4 - •, OH•, and H2SO5 that would be transported by the electroosmotic flow from the anode end toward the cathode to degrade PAEs and their metabolites if any; (2) an increase of the electric potential gradient from 1 V/cm to 2 V/cm would enhance the removal of PAEs in control tests with no addition of sodium persulfate and nanoscale magnetite to the remediation system; and (3) the residual PAEs would not be detected in the electrode reservoirs implying an effective degradation of PAEs in the sediment compartment of this novel remediation system. Accordingly, the novel remediation process employed in this study could be considered as a viable remediation technology for the removal of PAEs from sediments. An operating cost analysis has also assured the economic competitiveness of the present remediation technology. In summary, due to its inherent nature, the electrokinetic-related processes could be applied for full-scale in situ remediation of any porous media including clayey sediments. The coupling of nano-Fe3O4/S2O8 2- process and electrokinetic process would be a very competitive process for the treatment of PAEs-contaminated sediment in terms of remediation time and cost.