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Simulation of the Process of Aerobic Removal of Phenol from Wastewater using a Tubular Biofilm Bioreactor

Nasiri Jahmani, Kosar | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57545 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Askaripour, Hossein
  7. Abstract:
  8. For several decades, tubular bioreactors have been used in many microbiological processes such as wastewater treatment and biopesticide production. The use of biofilm in bioreactors has positive effects on their technical characteristics, which include increasing the concentration of biomass, preventing depletion and increasing the resistance of cells against the inhibitory effect of toxic compounds. The existing mathematical models for biofilms can be divided into two general categories: analytical and numerical. In this project, the goal is to simulate the removal process of phenol by aerobic microorganisms in a tubular bioreactor with a biofilm layer on its inner wall, using numerical methods. This bioreactor has three phases, the liquid phase and the gas phase, which continuously enter the bioreactor and provide the carbon substrate and oxygen needed by the cells, and the biofilm phase, where the biological reaction is carried out. In this research, mass transfer between phases, diffusion in the biofilm phase, separation of biomass from the biofilm phase, biological reaction in the biofilm phase and liquid phase have been considered in this research for proper simulation of the bioreactor. The system is investigated in steady state and the effect of parameters such as liquid phase retention time, bioreactor diameter, fraction of active biomass separated from biofilm and the effect of axial dispersion in liquid phase on phenol conversion rate is investigated. The validations performed with articles with laboratory results show that the simulation performed and the results obtained are consistent with the laboratory results obtained from a two-stage bioreactor including biomass particles in the liquid phase. The simulation results show that a tubular bioreactor with a biofilm layer can reduce the concentration of 0.1 kg/m3 input phenol at the end of the bioreactor to a concentration of 0.026 kg/m3 with a retention time of 1 hour, and by increasing the retention time, we can reduce the phenol as Remove completely from the wastewater
  9. Keywords:
  10. Biofilm ; Microbiology ; Simulation ; Phenolic Compounds Removal ; Tubular Bioreactor

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