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Investigation and Controlling of Sludge Bulking in Wastewater Treatment Plant with Synthetic Wastewater

Gholami, Mohsen | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50448 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shayegan, Jalaleddin
  7. Abstract:
  8. Biological treatment is an essential part of wastewater treatment. One of the major problems of the biological treatment systems is a solid separation. Filamentous bulking is a type of solid separation problem that settled sludge volume and the turbidity of the effluent will be increase in bulking condition. The presence of excessive Filamentous bacteria causes filamentous bulking. In this thesis, filamentous bulking were studied to understand this phenomena better and tried to control that with the different methods. This research was conducted in laboratory scale Sequencing Batch Reactor (SBR), conventional activated sludge and conventional activated sludge with anaerobic selector with synthetic wastewater. Some factors were examined in order to find out the parameters which can cause filamentous bulking rapidly. Other methods such as increasing recycle activated sludge flow, using of oxidizing or coagulant material and anaerobic selector were used to control filamentous bulking. As the results showed, the deficiency of dissolved oxygen and nutrient caused filamentous bulking faster than other factors. On the other hand, deficiency of dissolved oxygen and nutrient had high response rate and created filamentous bulking in shorter period of time. Increasing in recycle activated sludge flow wasn’t enough to control filamentous bulking and the flocs of sludge increased the effluent turbidity. Using of Sodium hypochlorite and Cationic Polyelectrolyte simultaneously, controlled filamentous bulking expeditiously. Anaerobic selector was useful to control filamentous bulking and the results showed the best performance of anaerobic selector with increasing in hydrolic residence time and the influent COD
  9. Keywords:
  10. Synthetic Wastewater ; Biological Sewage Treatment ; Solid Retention Time ; Chemical Oxygen Demand (COD)Removal Ratio ; Filamentous Sludge Bulking ; Response Rate ; Anaerobic Selector

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