Membrane and Water Treatment

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The BNR-MBR(Biological Nutrient Removal-Membrane Bioreactor) for nutrient removal from high-rise building in hot climate region

  • Ratanatamskul, C. (Department of Environmental Engineering, Chulalongkorn University) ;
  • Glingeysorn, N. (Department of Environmental Engineering, Chulalongkorn University) ;
  • Yamamoto, K. (Department of Urban Engineering, University of Tokyo)
  • Received : 2011.11.29
  • Accepted : 2012.02.20
  • Published : 2012.03.25
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Abstract

The overall performance of BNR-MBR, so-called Anoxic-Anaerobic-Aerobic Membrane Bioreactor ($A^3$-MBR), developed for nutrient removal was studied to determine the efficiencies and mechanisms under different solid retention time (SRT). The reactor was fed by synthetic high-rise building wastewater with a COD:N:P ratio of 100:10:2.5. The results showed that TKN, TN and phosphorus removal by the system was higher than 95%, 93% and 80%, respectively. Nitrogen removal in the system was related to the simultaneous nitrification-denitrification (SND) reaction which removed all nitrogen forms in aerobic condition. SND reaction in the system occurred because of the large floc size formation. Phosphorus removal in the system related to the high phosphorus content in bacterial cells and the little effects of nitrate nitrogen on phosphorus release in the anaerobic condition. Therefore, high quality of treated effluent could be achieved with the $A^3$-MBR system for various water reuse purposes.

Keywords

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