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Performance Comparison of Membrane Bioreactor and Activated Sludge Processes in Starch Wastewater Treatment

Keyan, Mohsen | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41594 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shayegan, Jalaledin
  7. Abstract:
  8. In this study the performance of the conventional activated sludge and the membrane bioreactor systems were investigated and their operations were compared. . A membrane bioreactor and a conventional activated sludge system which includes one aeration basin and one settling tank were designed and constructed. The feed was synthetic and the BOD:N:P ratio was 100:5:1. In order to starting the systems, the sludge supplied from the municipal wastewater treatment plant and inoculated. Then, the inoculated sludge was adapted to treat the starch wastewater with step by step increasing the feed COD. . The performance of two systems investigated in inlet COD=2500 mg/L and four hydraulic retention times (HRT=6, 12, 18 and 22 hr) which satisfied organic loading rate2.72, 3.33, 5 and 10 kg COD/m3.d, respectively. . It was observed that the membrane bio reactor removed the 99% of the inlet COD in each four hydraulic retention time and it was steadiest than the conventional activated sludge through the experiments time. . Also, the conventional activated sludge removed approximately 97% of the inlet COD in HRT=22 hr, but the efficiency decreased due to decrease in the hydraulic retention time and finally reached to 88% in HRT=6 hr. It was observed for the MBR that the viscosity of the liquid increased and the micro organisms dispersed in HRT=12 and 6 hr which increased biofouling rate over the surface of membrane and limits usage of the MBR during the long time. Also, the settling tank become anaerobic in the conventional activated sludge system when HRT were 6 and 12 hr, and this caused the increase in the total suspended solid concentration in the outlet
  9. Keywords:
  10. Activated Sludge ; Starches ; Flat Sheet Membraine ; Chemical Oxygen Demand (COD)Removal Ratio ; Membrane Bioreactor ; Artificial Wastewater

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