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Optimization the Performance of Multi-stage BNR Reactors Based on MBBR Reactor for Biological Removal of Nitrogen and Phosphorus in Saline Wastewater Refinery and Compared with Membrane Bioreactor Systems and USBF

Delashoob, Abolfazl | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47528 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Borgheei, Mahdi
  7. Abstract:
  8. There are a lot of industry, including refineries with saline wastewater. Biological wastewater treatment saline pose particular problems and leads to plasmolysis microorganisms in the presence of salt. Remove salt from the wastewater before biological treatment by reverse osmosis or ion exchange and other methods are expensive and often impossible. Remove nutrients from wastewater before disposal and give up their saline for nature is essential. Because the these materials, especially nitrogen and phosphorus can degrade water quality and even make it unusable. So that by increasing the concentration of the algae production is also too much and cause eutrophication of water tanks are grown. In this research of nitrogen and phosphorus in wastewater biological treatment of saline was evaluated in various systems and the system, MBBR and A2O were selected as the best system. In this study in the retention time of 24 and 12 hours and the concentrations of nitrogen, 200, 300 and 400 milligrams per liter and four phosphorus concentrations and the concentrations of COD, 800, 1000 and 1200 mg per liter and four concentrations of salt, 10, 12 , 17 and 20 grams per liter was performed. The results show that percent between 92.2% to 99.1% COD removal was high and variable, so that the amount of increase in the amount of COD input to the system and reduce the time and also have a high salt concentration, reduced but the concentration of ammonia input is much smaller impact on the removal of ammonia. Also increase nitrification, nitrate anoxic entering the reactor increases and the amount of nitrate removal in the reactor anoxic 47.3% to 74.8% between variables. Varies between 84.1% and 97.6% phosphorus removal rate changes as well as reducing the time and concentration to be reduced. Removal of the upper face, and then to determine the best system performance, optimized mode with the MBR system and USBF compared and it was found that the main system is very high material removal rate and shock tolerance and ability to run industrial-scale is.The microorganisms were identified bacterial species of Staphylococcus warneri ATCC 27863 (T)
  9. Keywords:
  10. Salt Effect ; Moving Bed Biofilm Reactor (MBBR) ; Biological Treatment ; Saline Wastewater ; Membrane Bioreactor ; Biological Phosphorus Removal ; Biological Nitrogen Removal ; Upflow Sludge Blanket Filtration ; Saline Refinery Wastewater ; Anaerobic-Anoxic-Oxic System

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