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The Study of Permeable Reactive Barriers Made of Nano Zero Valent Iron, for In-situ Groundwater Remediation

Atashin, Sabrine | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 46812 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Abrishamchi, Ahmad; Vossoughi, Manoochehr
  7. Abstract:
  8. In present research in-situ groundwater remediation by permeable reactive barriers is considered and the main goal is to find the optimal dimension of reactive walls and also to find the most efficient reactive media. Here, computer simulation is done via MODFLOW. Different barrier lengths, widths, depths and distances between trenches have been considered and contaminant removal percentage calculated in all situations. Based on the research achievements increasing the barrier length has led to reduction of contaminant removal percentage because flow gradient and flow density decrease by length increase. As the results show, contaminant removal percentage increases by width increase because the wider barrier provides the longer residence time. On the basis of water table mounding phenomenon, the contaminant removal percentage decreases by increasing the depth of hanging wall. Regarding the two trench barriers, results prove that the contaminant removal increases at distance in which the flow approaches to laminar condition, however, applying more increase in the barrier distance results to the decrease in the contaminant removal percentage because of the reduction of radius of influence between the trenches. It is also concluded that, hydraulic gradient has no significant effect on the contaminant removal percentage by PRB. In this research, two different methods are considered to optimize the efficiency of Fe0 in removing contaminants from water body. First one is reducing the size of Fe0 down to nano scale and the second one is using bimetallic components in order to increase the efficiency of Fe0. To summarize, the suitable length, width and depth of hanging wall is optimized to be all equal to 10 m and the best distance between trenches is suggested as 150 m. Finally the most efficient reactive media is bimetallic nano iron particle with reactivity factor of 10
  9. Keywords:
  10. Groundwater ; In-Situ Remedeation ; Nano Zero Valent Iron (NZVI)Particle ; Permeable Reactive Barriers ; Bimetallic Components

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