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Simultaneous Removal of Nitrogen, Phosphorus, and Organic Matter in a Biofilm Reactor Using Novel CBMC Carriers

Massoompour, Alireza | 2021

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 53605 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Raie, Mohammad; Borghei, Mehdi
  7. Abstract:
  8. This study aims to enhance biological nitrogen and phosphorus removal performance by the innovative carbon-based moving carriers (CBMC) and reveals the role of carrier characteristics on the nutrient removal efficiency. In this research, the new carriers with the advantages of both MBBR hybrid system and physicochemical properties of activated carbon were produced based on the recycling of waste materials for the first time via a chemical-thermal process. The analysis revealed that the specific surface area of the new carrier with a rough and highly porous structure was approximately 11.4 times that of the conventional MBBR carrier. This feature plus the other physicochemical properties of the new carrier surface (e.g. hydrophobicity and charged surface) not only affected positively bacterial adhesion by more than 18% but also shortened the biofilm formation by about 15% compared to MBBR carriers. Furthermore, in order to verify the performance of the new carriers, the experiments under various operating conditions were conducted in two parallel sequencing batch reactors containing CBMC and MBBR carriers which were fed with simulated sanitary wastewater (300-320mgCOD/L, 55-60mgNH4+-N/L, and 12-18mgPO4-3-P/L). During the first part of experiments involving simultaneous nitrification-denitrification process (SND), the comparative results indicated that the new carriers had a positive impact on the creation of broader anoxic zones within the biofilms. Accordingly, higher biological total nitrogen removal efficiency (TNR) was experienced for the biofilm reactor containing CBMC carriers compared to the MBBR reactor (approximately 90% vs. 80% at the filling ratio of 55% and 80% vs. 68% at the filling ratio of 45%). However, regardless of the carrier type, similar COD removal efficiency up to 94% was obtained for both reactors. During the second part of experiments including the simultaneous biological nitrogen and phosphorus removal (SNDPR), it was found that the characteristics of the new carriers influenced both the bacterial attachment and microbial population within relevant biofilms, indicating an increase in PAOs (and/or denitrifying PAOs) content inside the biofilms. Thus, higher biological phosphorus removal of about 12.5% (approximately 98% vs. 87%) was attained for the reactor with CBMC carriers. Besides, it was revealed that the formation of anoxic zones in sequencing batch biofilm reactors during the aerobic stage is a dynamic process and is strictly influenced by the biofilm thickness and features, and the structure of the carriers. In this regard, the CBMC carriers allow less biofilm space to be exposed to oxygen penetration and delay the shrinkage of anoxic areas as well. Thereby, compared to the MBBR reactor, higher nitrogen removal up to 15% (90% vs. 78%) was obtained mainly by denitrifying PAOs. Besides, the outcomes exhibited that higher SND and TNR efficiencies are accessible via selecting a suitable aeration program in a biofilm reactor. Finally, an efficient and cost-effective biofilm system for simultaneous nutrients removal was introduced in this research
  9. Keywords:
  10. Biofilm ; Wastewater Treatment Plant ; Simultaneous Nitrification and Denitrification ; Simultaneous Biological Nitrogen and Phosphorus Removal (SNDPR) ; Simultaneous Organic Matter and Nutrient Removal ; Carbon-Based Moving Carriers (CBMC) ; Moving Bed Biofilm Reactor (MBBR)

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  • چکیده
  • فهرست جداول‌
  • فهرست اشکال
  • PhD Thesis Template - Copy.pdf
    • چکیده
    • فهرست جداول‌
    • فهرست اشکال
  • 1-s2.0-S0043135419311145-main.pdf
    • Enhancement of biological nitrogen removal performance using novel carriers based on the recycling of waste materials
      • 1. Introduction
      • 2. Materials and methods
        • 2.1. Manufacturing process of the new carriers and the media specifications
        • 2.2. Experimental set-up description
        • 2.3. Feed composition
        • 2.4. Inoculation, biofilm formation and operational conditions
        • 2.5. Sampling and analytical methods
      • 3. Results and discussion
        • 3.1. Physical properties of the carbon-based carriers
        • 3.2. Formation and growth of the biofilms
        • 3.3. Organic removal
        • 3.4. Nitrogen removal
        • 3.5. DO and ORP profiles
        • 3.6. pH and NO3 profiles
      • 4. Conclusion
      • Declaration of competing interest
      • Acknowledgment
      • Appendix A. Supplementary data
      • References
  • PhD Thesis Template.pdf
    • چکیده
    • فهرست جداول‌
    • فهرست اشکال
  • PhD Thesis Template - Copy.pdf
    • چکیده
    • فهرست جداول‌
    • فهرست اشکال
  • PhD Thesis Template.pdf
  • PhD Thesis Template - Copy.pdf
    • چکیده
    • فهرست جداول‌
    • فهرست اشکال
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