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Removal of Ammonia from Wastewater by Ion Exchange Method using Natural Zeolite Adsorbent

Golshani Sarkhosh, Omid | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48181 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Moslemi, Mohammad Reza
  7. Abstract:
  8. The existing thesis investigates the removal efficiency of ammonia from wastewater using natural zeolite, and the effects of various parameters on the removal efficiency. The importance of this research is due of the fact that ammonia is among the primary contaminants of wastewater. The common method of removing ammonia is biological processes that have a number of drawbacks. The ion exchange method could be a suitable alternative to the former method. Ammonia removal from wastewater was investigated through both batch and continuous experiments. In these experiments the initial ammonia concentration in the wastewater was chosen to be 1000 mg/L, 100 mg/L. The optimum ammonia removal was achieved at pH=5. The adsorption isotherm of the zeolite studied in this research was more consistent with Freundlich rather than Langmuir isotherm. The presence of background competitive ions such as Mg+2 , Ca+2 , Na+ and K+ , resulted in a decrease in the removal efficiency such that the presence of potassium ion reduced the removal efficiency by 50%. Zeolite utilized herein can reduce ammonium concentration to breakthrough point of 2.5 mg/L in 82 bed volume (BV). The required volume of the regenerant solution of 15 gr/L sodium chloride at pH=10 in order to reach 90% release efficiency was determined to be 20 BV. Finally, it could be concluded that the zeolite can significantly remove ammonium and it indicated a high removal efficiency for wastewaters with low ion strength and acidic pH
  9. Keywords:
  10. Ion Exchange ; Natural Zeolite ; Continuous System ; Batch Method ; Reduction (Chemistry) ; Ammonium Removal

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