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Investigation of Effective Parameters on Membrane Fouling in Membrane Bioreactors

Khorasanizadeh, Mohaddeseh | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45075 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kariminia, Hamid Reza; Nahid, Parvin
  7. Abstract:
  8. Critical flux is an important parameter in membrane bioreactors, which studying it can give a better understanding of treatment by these bioreactors and make utilizing them easier. In this study, the effect of some sludge properties like it’s concentration, sludge volum index, concentration of protein and carbohydrate in EPS and SMP and the effect of some operating conditions like aeration flow rate and rest mode on critical flux in a submerged membrane bioreactor are investigated. In addition to comparison of TMP-t figures drived from flux step experiment, the hystersis figures are also compared. Finally, two long term experiments at two sub critical fluxes are done in order to study the changes of TMP, COD removal and protein and carbohydrate concentrations of EPS and SMP with time in eleven and five days, respectively for fluxes of 40 and 50 LMH. The experimental critical time, the time which the slop of the TMP-P figure changes intensly, is compared with the critical time from Saroj Equation. In this study, the positive effect of rest modes in two ranges of sludge concentration, the effect of aeration rate especially in higher sludge concentrations on fouling control, decrease of critical flux with increasing sludge concentration in a 2nd order profile, and the reverse relationship of critical flux with carbohydrate concentration of SMP was observed. More over, in long term operations the increase in flux, in subcritical fluxes coused decrease in critical time and increased fouling rate. Experimental datas matched the mathematical model
  9. Keywords:
  10. Critical Flux ; Flux Stepping Test ; Membrane Fouling ; Soluble Microbial Product (SMP) ; Critical Time ; Membrane Bioreactor

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