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Optimization of Biological Removal of Nitrogenous Compounds by Using Aerobic and Anoxic Fixed-Bed Bioreactors

Ghasem Aligoudarzi, Mehdi | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48066 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Borghei, Mehdi
  7. Abstract:
  8. Nitrogen compounds are becoming increasingly important in wastewater management. Due to several adverse effects which nitrogenous materials can have on the environment, there is a significant need for nitrogen removal. In this study, the biological nitrogen removal process from a wastewater with low COD was investigated in a submerged fixed bed reactor, constructed two anoxic and aerobic sections under Modified Ludzack-Ettinger process. Volume of each section was 10 liters. About 60% of each section was occupied with pumice stone.Experiments were conducted in 9 runs, for hydraulic retention times of 8, 6 and 4 hours, influent ammonia concentrations of 180, 90 and 30 mg/lit and recyle ratios of 3, 2 and 1. Concentrations of NH4-N, NO3-N and COD were measured during each run.The results depicated that increasing of HRT has a positive effect on removal efficiency of NH4-N, NO3-N and COD. Increasing of HRT, however, has a negative effect on nitrification rate. The maximum nitrogen removal was acheieved at a recycle ratio of 2. It was also observed that hncreasing the influent concentration of ammonia, resulted in increasing the nitrification rate in the aerobic column and COD removal efficiency in the anoxic column.NH4-N and COD removal efficiencies in the reactor vary between 76-88 % and 56-78% during continuous operation
  9. Keywords:
  10. Nitrification ; Denitrification ; Fixed Bed Reactor ; Biological Removal ; Modified Ludzack-Ettinger (MLF)Process

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