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Studies on Hybrid Reactor Consisting of Sequential Aerobic-Anoxic Systems for Nitrogen Removal Process from Industrial WasteWater

Vakilifard, Negar | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43296 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Borghei, Mehdi
  7. Abstract:
  8. In this study, the biological nitrogen removal process from a wastewater with high COD and TKN concentration was investigated in a hybrid reactor. In order to remove nitrogen completely with pre-denitrification process, both moving bed biofilm system and fixed bed biofilm system with pumice stone, were used in a single reactor (volume is 16 l). Moving bed biofilm and fixed bed biofilm systems were considered in sequence, as aerobic and anoxic parts of the reactor. 35% of the aerobic volume was occupied with plastic carriers and 70% of the anoxic volume was occupied with pumice stone with an average diameter of 30mm. Experiments were done in 7 runs, for total hydraulic retention times of 30, 24, 18 and 12 hrs; influent TKN-N concentrations of 100-400 mg/l and constant recycle ratio of 2.5 were used. Concentration of TKN-N, NH4-N, N-org, NO3-N and COD were measured during each run. The results showed that NH4-N and TKN-N are removed mostly in aerobic phase and N-org and NO3-N removal are taken place in anoxic phase. In accordance with tests, increasing of HRT has a positive influence on removal efficiency of these compounds; although in the case of nitrate-nitrogen removal, influent concentration of this compound to anoxic phase is the effective factor on efficiency. It was also observed that increasing the influent concentration of TKN-N up to 300 mg/l resulted in increasing the TKN-N, NH4-N and NO3-N removal efficiency. In addition to nitrogen removal, the system has high capacity in removing COD and the trend of changes of removal efficiency of COD in the reactor follows the trend of changes of removal efficiency in the aerobic phase.
  9. Keywords:
  10. Moving Bed Biofilm Reactor (MBBR) ; Biofilm Reactors ; Denitrification ; Nitrification ; Hybrid Reactor ; Biological Nitrogen Removal

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