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Tertiary Treatment of Arak Refinery Dilute Wastewater by Moving Bed Biofilm Reactor (MBBR) Combined with Flocculation and Coagulation Process

Najafkhani, Farhang | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48895 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s):
  7. Abstract:
  8. In this research, the capability of an aerobic moving bed biofilm reactor (MBBR) for removal of phenol from Arak refinery dilute wastewater has been investigated. A cubical MBBR with approximate capacity of 10 liters was filled with Kaldnes-K1 biocarriers at filling ratio at 50 percent. Moreover, The MBBR which filled with actual refinery wastewater, combined with Flocculation and Coagulation in order to removing more COD, turbidity and TSS and also reaching to criterion that water can be used by cooling tower. The effects of Phenol concentration (10-100 mgl-1), COD concentration (50-500 mgl-1), Hydraulic Retention Time (HRT) (4-12 h) and Phenol shocks on the performance of MBBR were investigated. The reactor could remove more than 96 percent of inlet Phenol concentration at 100 mgl-1 and 92 percent of inlet COD concentration at 500 mgl-1 at HRT of 12 h. The reactor could also resist strong shock loads. Furthermore, the result showed that Stover-Kincannon was the best model to describe the biological kinetic data in this study. Jar test by using PACL (5-45 mgl-1) and Alum (5-55 mgl-1) as coagulants and Polyelectrolyte (1-6 mgl-1) as flocculant, at 125 rpm in time of 3 minutes for rapid mix and 41 rpm in time of 15 minutes for slow mix and also 30 minutes for settling, was performed. During the Jar test, pH was kept at 7. The optimal coagulant and flocculant was PACl at concentration of 25 mgl-1 and polyelectrolyte at concentration of 2 mgl-1 which could remove more than 90 percent of COD, Turbidity and TSS
  9. Keywords:
  10. Turbidity ; Biological Models ; Phenol ; Chemical Oxygen Demand (COD)Removal Ratio ; Moving Bed Biofilm Reactor (MBBR) ; Total Suspended Solids (TSS) ; Phenol Shock ; Jar Test

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