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Experimental Study on the Efficiency of Moving Bed Biofilm Reactor in Treating Ethylene Glycol

Esmaeili Rad, Nasim | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41097 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Borghei, Mehdi; Vossoughi, Manoochehr
  7. Abstract:
  8. The removal of ethylene glycol, one of the most widely used antifreez, with moving bed biofilm reactor (MBBR) was studied. Beside of ethylene glycol, the synthetic wastewater contained molasses and other salts as nutrient source. The packings were composed of polyethylene and shaped like small cylinders with a surface area of 500 m2 per m3 bulk volume of carriers(KMT). The COD of the feed was adjusted by varying the ratio of ethylene glycol to molasses. The total COD was 1252.5, 1345 and 1500 mg/L. The resulted showed that when the biofilm grows on the packings and its thickness is good enough, the removal efficiency increased. The increase was attributed to higher concentration of biomass or MLSS and Biofilm Solids(BS) in the MBBR. The average of MLSS in the MBBR was 2500 mg/L while in bioreactor without cell recycling and in batch mode it was.In the MBBR different hydraulic retention times (HRT) 15, 18 ,24 and 48h were applied. The effect of the variation of HRT was studied on removal efficiency of COD. The removal efficiency of COD for longer HRT (48h) and in the second reactor was about 96.7%. The removal efficiency was lower for the first reactor, it varied from 60 to 85% depending on the initial COD. The higher removal efficiency in MBBR effluent shows the effectiveness of the membrane in removing COD. Some experiments ith packings and without biological treatment were performed. The results showed that the packings were capable to reduce COD maximum by 89%. In fact themajor removal was carried out by biofilm (biodegradation) in the packings
  9. Keywords:
  10. Ethylen Glycol ; Moving Bed Biofilm Reactor (MBBR) ; Sewages ; Kaldness Miliotechnique (KMT)Packing ; Biofilm

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