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The Effect of Sulphate Concentration on Nitrogen Removal in MLE Bioreactor

Ebrahimiazar, Maryam | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49886 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Borghei, Mehdi
  7. Abstract:
  8. Discharging wastewater effluents to water bodies has many detrimental impacts on water quality. Thus, to prevent issues such as eutrophication and oxygen depletion, nitrogen removal is often required in wastewater treatment plants. Biological nitrification and denitrification, in comparison to physical and chemical methods, is more cost-effective and environmentally friendly, and this makes it one of the most commonly used approaches for nitrogen removal. In this work, nitrification and denitrification process and the effect of sulphate on this process is studied in a moving bed biofilm reactor (MBBR). The method used is modified LUDZACK-ETTINGER (MLE) which has an initial denitrification structure. Aerobic reactor volume is 8.68 liter and anoxic reactor volume is 5.78 liter. The recycle flow amount from aerobic reactor to anoxic reactor has considered being 2 times of anoxic reactor feed. Results show that before adding sulphate, ammonium removal in aerobic reactor varies between 62.66% to 81.56%. Nitrification rate increases when inlet COD decreases and inlet amoonium increases. Also, with adding sulphate, ammonium removal decreases, and depending on inlet sulphate and ammonium concentration, the efficiency of aerobic reactor varies between 57.79% to 80.02%. Furthermore, nitrate removal in anoxic reactor before adding sulphate varies between 41.51% to 55.29%. Adding sulphate has a negative effect on the efficiency of anoxic reactor. The reason is that because of the activity of sulphate reducing bacteria (SRB) hydrogen sulphide is produced which inhibits the activity of bacteria. Depending on inlet sulphate concentration, after adding suphate, nitrate removal varies between 34.97% to 53.19%
  9. Keywords:
  10. Denitrification ; Biological Treatment ; Nitrification ; Nitrate Removal ; Modified Ludzack-Ettinger (MLF)Process ; Moving Bed Biofilm Reactor (MBBR)

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