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Torkaman, Mojtaba | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45448 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Borgheei, Mahdi
  7. Abstract:
  8. Removing nitrogen, as one the most surface and ground water contaminant is very important and in order to achieve this aim,nitrification and denitrification are effective and economical methods. In this work, moving bed biofilm reactor (MBBR) with initial denitrification structure, adapted from modified LUDZACK-ETTINGER (MLE) method used in order to industrial wastewater treatment with COD value in range of 900-2100 mg/lit and ammonium in range of 150-430 mg/lit in 3 hydrolic retention time of 18 , 12 and 8 hours.Aerobic reactor volume is 14.4 liter and anoxic reactor volume is 7.2 liter and reflux flow amount from aerobic reactor to anoxic reactor has considered being 3 times of anoxic reactor feed. Poly-ethylene packings with 0.96 gr/cm3 density have used which occupied 50% of reactors volume. Results shows that COD removal is high and varies between 90% to 99%, due to biofilm feature and hetrotrophic bacteria low sensitivity to condition alterations. Ammonium removal amount varies between 40.85% to 89.6% as it decreases when inlet COD increases and hydrolic retention time decreases.But ammonium concentration changes have a very low effect on ammonium removal. Furthermore since rate of nitrification increases, amount of inlet nitrate to anoxic reactor increases. Also amount of nitrate removal in anoxic reactor varies between 31.6% to 78.15 %
  9. Keywords:
  10. Biological Treatment ; Moving Bed Biofilm Reactor (MBBR) ; Biofilm ; Nitrification ; Denitrification

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