利用奈米零價鐵粉體及地電阻顯影儀現址處理地下水污染之技術研發
| 中文摘要 | 含氯有機化合物屬於比水重之非水相液體(DNAPL)，會穿透地下水位面進入含水層，不隨地下水流場而移動，在含水層中以垂直向下移動為主，並在移動路徑上形成殘留量，增加土壤及地下水污染範圍，形成永久性污染源。奈米零價鐵微粒經表面改質後分散在水相中，再注入地下水層，讓分散之奈米零價鐵接觸DNAPL殘留量而還原降解成較無害的產物。實驗所合成之奈米零價鐵粉，粒徑大小為20-50 nm，表面改質披覆PEI膜後，能有效懸浮並完全分散在水相中。因奈米零價鐵的表面改質劑為水溶性高分子薄膜，於水中會緩慢溶解，曝露新鮮的奈米零價鐵微粒。在現場水井投入奈米零價鐵懸浮液後，部分污染物濃度已明顯降低。實驗室測出之導電度趨勢與地電儀影樣圖(RIP))判定結果相符，顯示投入之奈米零價鐵懸浮液，確實已在地底下隨著水流移動，進而和污染物plume作用。由施測結果可知，表面改質後奈米零價鐵懸浮溶液與DNAPL污染物產生之氧化鐵為低導電率，表示地層中電阻率增加亦有表面改質後奈米零價鐵懸浮液，與DNAPL反應而還原降解所造成。本計畫已初步建立奈米零價鐵粉體及地電阻顯影儀現址處理地下水污染之完整操作程序及技術，進而提升國內地下水污染之現址處理技術，並可做為日後污染場址的整治復育之參考，落實整治技術之本土化目標。 | ||
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| 中文關鍵字 | 奈米零價鐵微粒、地電阻顯影儀、比水重之非水相含氯有機物液體、直接注入法、還原分解、現地整治。 | ||
基本資訊
| 專案計畫編號 | EPA-95-U1U4-00-2 | 經費年度 | 095 | 計畫經費 | 1150 千元 |
|---|---|---|---|---|---|
| 專案開始日期 | 2006/03/03 | 專案結束日期 | 2006/11/30 | 專案主持人 | 林錕松 |
| 主辦單位 | 永續發展室(停用) | 承辦人 | 羅慧敏 | 執行單位 | 元智大學創新育成中心 |
成果下載
| 類型 | 檔名 | 檔案大小 | 說明 |
|---|---|---|---|
| 期末報告 | KM-99977735-1.pdf | 10MB | [期末報告]公開完整版 |
Development for In-Situ Remediation of Contaminated Groundwater by Zero-Valent iron Nanoparticles and RIP Method
| 英文摘要 | Remediation of sites contaminated by dense non-aqueous phase liquids (DNAPLs), especially chlorinated organic compounds, is a significantly priority in the environmental field because of their widespread use in many applications. DNAPLs usually can penetrate groundwater and reach aquifer. The condensed DNAPLs may be immobilized and further penetrate down to deeper aquitard zone that can not be easily removed by pumping. The persistent-contaminated DNAPLs may also pollute the soil and groundwater simultaneously during moving in the groundwater slowly. High activity and surface area of zero-valent iron nanoparticles (ZVINs) can be suspended in water by surface-modification with PEI polymeric films. The suspended ZVINs can be further injected into the wells and reach the plume of DNAPLs down with the flowing groundwater. Finally the plume may be catalyzed and decomposed to nontoxic species on highly active ZVINs. Experimentally, the ZVINs of 20-50 nm in size were synthesized by a hydrothermal method and then the PEI-coated ZVINs are easily and stably suspended in water. The water-soluble PEI coating of ZVINs may flow with the groundwater and the completely fresh ZVINs were observed while approaching the DNAPLs plumes. The data of in-situ remediation indicated that concentrations of DNAPLs after using well-injection method were notably reduced. By using resistivity image profiling (RPI), the conductivity data of modified ZVINs solution and sampling groundwater were similar. It indicated that lower conductivity of FeO species was found. In addition, RPI can elucidate complex subsurface DNAPLs structures by dense sampling of resistivity variation at shallow depth. The combinative technology of floating surface-modified ZVINs and RPI technique would be economically and environmentally attractive. Furthermore, the simulation calculation, basic engineering design, and economic estimation of this in-situ remediation technique were also performed to develop a domestic in-situ remediation technology in the near future. | ||
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| 英文關鍵字 | Zero-valent iron nanoparticle, Resistivity image Profiling, Dense non-aqueous phase liquid chlorohydrocarbons, Directly injection method, Reductive decomposition, In-situ remediation. | ||