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Experimental Study on the Efficiency of Memberane Bioreactor (MBR) in Removal of Trace Persistent Pollutants

Fouladi Ghale, Hosnie | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39882 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Borghei, Mahdi; Vosoughi, Manuchehr; Hesampour, Mehrdad
  7. Abstract:
  8. The removal of glyphosate, one of the most widely used herbicide, with membrane bioreactor (MBR) was studied. Beside of glyphosate, the synthetic wastewater contained molasses and other salts as nutrient source. The membrane was made from polypropylene and was immersed in the bioreactor. The COD of the feed was adjusted by varying the ratio of glyphosate to molasses. The total COD was 500, 750 and 1000 mg/L. The resulted showed that when the bioreactor coupled with membrane the removal efficiency increased. The increase was attributed to higher concentration of biomass or MLSS in the MBR. The average of MLSS in the MBR was 8500 mg/L while in bioreactor without cell recycling and in batch mode it was. In the MBR different hydraulic retention times (HRT) 15, 18 and 24h were applied. The effect of the variation of HRT was studied on removal efficiency of COD. The removal efficiency of COD for longer HRT (24h) and in the permeate of membrane was about 96%. The removal efficiency was lower inside of the bioreactor, it varied from 60 to 84% depending on the initial COD. The higher removal efficiency in MBR effluent shows the effectiveness of the membrane in removing COD. Some experiments with membrane and without biological treatment were performed. The results showed that the membrane was only capable to reduce COD maximum by 18%. In fact the major removal was carried out by microorganism (biodegradation) in the bioreactor.

  9. Keywords:
  10. Herbicides ; Sewages ; Membrane Bioreactor ; Glyphosate

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