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Biological Treatment of Dairy Wastewater (Anaerobic/Anoxic/Aerobic)

Yaghoobinezhad, Farnaz | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49809 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Alemzadeh, Iran; Vosoughi, Manouchehr
  7. Abstract:
  8. In this research, start-up, performance and stability of a A2O system (Anaerobic/ Anoxic/ Oxic) combined with a Moving Bed Bio Reactor (MBBR), using Kaldnes packings, have been investigated in treating synthetic dairy wastewater. Also the effect of influent Chemical Oxygen Demand (COD), Hydroulic Retention Time (HRT) and Ruturn Activated Sludge (RAS) ratio on removing pollutants such as COD, Total Nitrogen and Total Phosphorous have been studied. The experiments have been designed using ‘Design Of Experiments’ software, and at the end the results have been optimized based on desired terms. The performance and capability of the reactor in removing pollutants in 8, 12 and 16 hours of HRT, 1000, 2000 and 3000 mg/l of influent COD and RAS ratio of 30, 60 and 90% of influent flow rate were evaluated. Based on these results different models have been proposed for removing COD, Nitrogen and Phosphorous. The experiments showed that COD and Nitrogen removal are directly related to HRT and RAS ratio but influent COD has a decreasing effect. And the highest removal efficiency of 98 and 94% were achieved for COD and Nitrogen respectively. For Phosphorous removal effieciency the influent COD and RAS had an increasing effect, maximum and minimum of 93 and 47% removal efficiency were obtained respectively. In general, the reactor showed a reasonable performance in different situations and reached a desirable removal efficiency of each pollutant in optimization condition
  9. Keywords:
  10. Biological Treatment ; Nitrogen ; Phosphorus ; Chemical Oxygen Demand (COD)Removal Ratio ; Process Optimization ; Dairy Wastewater ; Anaerobic-Anoxic-Oxic System ; Moving Bed Biofilm Reactor (MBBR)

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