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Performance Optimization of SBR Reactors Using Fluidized Media (Conversion of SBR to SMBBR)

Safi Samghabadi, Farshad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51648 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Borghei, Mehdi
  7. Abstract:
  8. In recent years, utilization of hybrid attached and suspended growth system for modification of conventional activated sludge systems has attracted a lot of attentions. Nowadays, with development of urban areas and also introducing new emerging contaminants and as a result an increase in the influent loading of wastewater treatment facilities, the importance of upgrading and retrofitting available facilities have been highlighted. Conversion of Sequencing Batch Reactors to Sequencing Batch Biofilm Reactors is a viable solution for overcoming these problems. Eventhough several researches have been conducted on removal of different contaminants through these systems, the information about the optimized performance condition and the amount of incensement in treatment capacity and other advantages of such systems is not available.In this projects, employing fluidized media led to an increase in the available surface are for the growth of bacteria and also provided the system with a higher sludge retention time in comparison with conventional system. This media did not change the settling properties significantly, however led to a decrease in the sludge production yield. The influence of parameters such as dissolved oxygen, temperature and filling ratio was investigated. The best performance was observed with DO in range of 3.5-4.5 mg/lit, temperature in range of 28-32 degree of Celsius and filling ration of 40 percent. When the COD loading was 0.9 kg/m3 day, the removal efficiency was 100%. With moving toward loading of 5.6, this amount decreased to 90.6 for SBBR and 84.3 for SBR. The removal efficiency of Total Nitrogen with change of loading from 152 to 656 g TN/ m3 day, was 91.3 to 59.8 % for SBBR and 81.2 to 38.6 for SBR. When loading of Total Phosphorous varied from 9.1 to 47 g TP/ m3 day, the removal efficiency was in range of 94.3-71.5 % for SBBR and 71.5-50 % for SBR. All in all, SBBR revealed its advantageous mainly in high loadings which is a proof for eligibility of these systems for upgrading and retrofitting purposes. These systems can be appropriate for the units which are in need of upgrading or increasing treatment capacity. Finally, an average increase of 18.2% for Nitrogen removal efficiency and 16.8% for Phosphorous are predictable especially for the cases which have restrictions in space and investment
  9. Keywords:
  10. Sequencing Batch Reactor (SBR) ; Biofilm ; Upgrading ; Fluidized Bed ; Simultaneous Nitrification and Denitrification ; Fluidized Bed Biorector (FBBR) ; Phosphorus Chemical Removal

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