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Designing Granular Sequencing Batch Reactor for Investigating the Effect of Influent Feeding Alkalinity and Rreactor pH on Aerobic Granulation

Rezasoltani, Samira | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45471 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shaygan, Jalal
  7. Abstract:
  8. Laboratory experiments were carried out to investigate the effect of influent alkalinity and reactor pH on microbial species, morphology and performance efficiency of aerobic granules. The experiments were conducted in two L sequencing batch reactors (R1-R2) with different influent alkalinity and pH medium. pH in R1 ,with high influent alkalinity, was in the range of 7-7.5 and pH in R2 was adjusted in 4.5-5.5. The experimental results demonstrated that the dominated microbial species and structure of granules were different in two rectors. Acidic environment of R2 provide favorable condition for fungal growth and granules formed within first week of operation. On the other hand in R1, dominated species were bacteria and appearance time of granules was 3 week after start-up. Different microbial structure of dominated species of granules results in different reactor performance in the case of evolution time and morphology of granules, reactor suspended solids, physical strength and settling ability of granules. As results shown, it is apparent that applying different pH levels in different granulation stages, e.g., a lower pH in the early stage and a gradual increase of pH in the later stage, can be an effective start-up strategy to facilitate rapid granule formation and sustain healthy granules in bioreactors. Implementation of this strategy in granulation systems, besides reducing required time for granule formation, having other advantageous such as possible reduction of pathogens in granules, high capability in nitrification and enhance substrate degradation rate in wastewater
  9. Keywords:
  10. Fungal and Bacterial Growth ; Aerobic Granulation ; Reactor Start-Up Period

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