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Investigation of Petroleum Pollutant Removal in a Membrane Bioreactor

Rahmani Nezhad, Ali | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43846 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kariminia, Hamid Reza; Moslehi Moslehabadi, Parivash
  7. Abstract:
  8. In this study, the performance of Convectional activated sludge reactor (CAS), moving bed biofilm reactor (MBBR) and coupled MBBR-membrane bioreactor (MBR) for diesel removal was investigated.
    Hydrocarbon quantification was conducted based on a photometery method at 250 nm after extraction with n-hexane.
    Experiments with MBBR was conducted in a batch mode using the sludge obtained from a municipal wastewater treatment plant. In order to adapt microorganisms with diesel as carbon sourse, diesel concentration was gradualy increased from 100 to 3400 ppm where diesel removal efficiency decreased from 62/1 to 26/6 %. However, after addition of diesel degrading bacteria (previously isolated from a polluted site in iran), complete elimination of diesel with the initial concentration of 500 ppm was observed. Using higher diesel concentration (800 ppm) resulted in 94% removal efficiency.
    After that, the MBBR and CASbwere operated under continious condition at different influent concentrations of diesel using 6, 12 and 24 hours hydraulic as retention time (HRT). It was observed that higher diesel removal efficiencies can be achived at higher HRT or higher MLSS concentration.
    The coupled MBBR-MBR system had an acceptable performance at low concentrations of diesel. At higher diesel concentrations, membrane fouling halted the operation of MBR which implies modifing the coupled system
  9. Keywords:
  10. Membranes ; Membrane Bioreactor ; Hydraulic Retention Time (HRT) ; Mixed Liquid Suspended Solid (MLSS) ; Moving Bed Biofilm Reactor (MBBR) ; Hybrid Reactor

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