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Effect of Salinity on MLE Process Function

Salahshoor, Zahra | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49364 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Borghei, Mehdi; Kariminia Hamedani, Hamidreza
  7. Abstract:
  8. Removing nitrogen, as one of the most important contaminants of surface and ground water, needs to be considered. Since this material minimizes water quality and makes it useless. On the other hand, many industries as refineries have saline wastewater which their salinity removal is not economical by physical and chemical methods and is often impossible. Although biological treatment of saline wastewater has its problems, biological nitrification and denitrification are efficient and economical methods for nitrogen removal from industries saline wastewater. In this research, moving bed biofilm reactor (MBBR) adopted from Modified LUDZACK – ETTINGER (MLE) method has been used in order to treat industrial wastewater with COD values of 800, 1000 and 1200 mg/lit, ammonia concentration in range of 200-400 mg/lit, salt concentration values of 2500, 5000 and 10000 mg/lit and hydraulic retention times of 8, 12 and 18 hours. Another reactor with similar circumstances has been used as blank. Aerobic and anoxic reactors volumes are respectively 18 and 9 liters. The results show that COD removal in comparison with blank reactor makes no considerable difference and this value decreases with increasing inlet COD, decreasing hydraulic retention time and increasing salt concentration and varies between %98 and %87. Ammonia removal values shows more reduce with increasing salinity in comparison with blank reactor, but inlet ammonia concentration variations has less effect on nitrogen removal. Increasing nitrification rate also produces more inlet nitrate to anoxic reactor and nitrate removal value in anoxic reactor varies between 81.7% and 42.7%
  9. Keywords:
  10. Denitrification ; Moving Bed Biofilm Reactor (MBBR) ; Biological Treatment ; Nitrification ; Saline Wastewater ; Modified Ludzack-Ettinger (MLF)Process

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