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Fluoride Removal from Radioactive Wastewater of UCF Plant by Adsorption

Rezaei Hajideh, Maryam | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47376 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Samadfam, Mohammad; Sepehrian, Hamid
  7. Abstract:
  8. In this research, a review on fluoride adsorption revealed that the modification of the adsorber surface with ions like Ca2+ results in great enhancement of the fluoride adsorption. It seems that the enhancement in fluoride adsorption by the modified adsorber, is mainly due to the selective chemical binding of the fluoride ion with the surface-bound ion (Ca2+), regardless of the base material itself. In order to confirm this hypothesis, two different adsorber materials namely, γ-alumina (a material, conventionally used for fluoride removal from water and wastewater) and Micro-silica (a mineral with small adsorption capacity for fluoride) were selected for further study. It was found that the adsorbtion of Fluoride ions by un-modified Micro-silica granules was very small at initial fluoride concentration ranges up to 100 ppm. In addition, the un-modified γ-alumina, showed an adsorption capacity of ~ 3mg/g (at initial fluoride concentration of 100 ppm), in accordance with capacities reported in literature for γ-alumina. After surface modification by Ca2+ ions, the fluoride adsorption by both the Micro-silica and γ-alumina granules were drastically increased (12.18 mg/g, 14.58 mg/g for Micro-silica and γ-alumina, respectfully). Experimental results with actual waste water samples from UCF plant also showed that surface modification with Ca2+ ions resulted in better adsorption by the Micro-silica and γ-alumina. Our findings suggest that Micro-silica, a by-product of Zirconium Production Plant (ZPP) can be an encouraging candidate material for fluoride removal from waste water of the UCF plant. Since the UCF is located at the vicinity of the ZPP plant and they both have same parent company, the idea is looks more economically attractive. Of course, as we mentioned in final part of this thesis (suggestions for further studies), more research should done before we able to finally decide on the best material for the fluoride removal from the waste water of the UCF Plant
  9. Keywords:
  10. Radioactive Waste ; Adsorption ; Alumina ; Silica Fume ; Uranium Conversion Facilities (UCF)Plant ; Fluoride Removal

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