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Biological removal of nutrients (N & P) from urban wastewater with a modified integrated fixed-film activated sludge-oxic settling anoxic system using an anoxic sludge holding tank

Fazelipour, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1111/wej.12673
  3. Publisher: John Wiley and Sons Inc , 2021
  4. Abstract:
  5. In this research, the efficiency of the integrated fixed-film activated sludge-oxic settling anoxic (IFAS-OSA) system in biological nutrient removal was studied. The oxic-settling anoxic (OSA) process is known as a cost effective way to reduce the nutrients (nitrogen and Phosphorus). According to the results, the percentages of total nitrogen removal efficiency in the IFAS, IFAS-OSA2h and IFAS-OSA4h systems were 78.56 ± 2.46, 83.60 ± 0.92 and 85.03 ± 1.69, respectively, while the percentages of phosphorus removal efficiency in these systems were 32.69 ± 8.25, 36.35 ± 6.73 and 39.87 ± 3.61, respectively. The PCR-RFLP method showed that C. albicans had the greatest prevalence (n = 36, 90%). Moreover, Vorticella convallaria was identified as the most abundant species of protozoa. The current research demonstrated that the efficiency of the modified IFAS-OSA process was higher than that of IFAS in the removal of nutrients (TN and (Formula presented.) –P) and can be a suitable method for upgrading the wastewater treatment plants worldwide. © 2021 CIWEM
  6. Keywords:
  7. Cost effectiveness ; Efficiency ; Nitrogen removal ; Phosphorus ; Polymerase chain reaction ; Sewage treatment plants ; Wastewater treatment ; Biological nutrient removal ; Biological removal ; Integrated fixed-film activated sludge ; Nitrogen and phosphorus ; PCR-RFLP methods ; Phosphorus removal ; Total nitrogen removal ; Wastewater treatment plants ; Nutrients ; Nitrogen ; Activated sludge ; Anoxic conditions ; Bacterium ; Concentration (composition) ; Detection method ; Integrated approach ; Organophosphorus pesticide ; Pollutant removal ; Protozoan ; Sludge ; Storage tank ; Wastewater ; Wastewater treatment plant ; Controlled study ; Convallaria ; Hydraulic retention time ; Nonhuman ; Nutrient ; Polymerase chain reaction restriction fragment length polymorphism ; Prevalence ; Priority journal ; Waste component removal ; Waste water management ; Waste water treatment plant ; Candida albicans ; Protozoa ; Vorticella convallaria
  8. Source: Water and Environment Journal ; Volume 35, Issue 2 , 2021 , Pages 830-846 ; 17476585 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/wej.12673