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Mathematical Modeling of Upflow Biofilm Reactor for Wastewater Treatment

Kahrizi, Sajad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45298 (06)
  4. University: Sharif University of Technology
  5. Department: Petroleum and Chemical Engineering
  6. Advisor(s): Yaghmaee, Soheila; Kariminiaye Hamedani, Hamid Reza
  7. Abstract:
  8. By increasing of population, migration to urban area and industrial development, the concern of environmental pollution becomes more important. Wastewaters are one of the polluting agents which should be collected, treated and reused in a safe and healthy condition. Generally wastewater treatment systems are classified into two major groups, namely aerobic and anaerobic treatment systems.Anaerobic fixed bed reactors are used for decreasing the organic load of wastewater. Enhancement of microbial retention time by attaching the organisms to packings is the most significant advantage of this bioreactor which increases the removal efficiency of organic materials of strength wastewater.In this research, anaerobic treatment in an upflow fixed bed biofilm reactor was studied by a mathematical modeling. For this purpose, first the important and required reactions of anaerobic process were specified, also the governing equations of an upflow fixed bed reactor were categorized. Then unknown kinetic parameters was obtained by inverse modeling using genetic algorithm. To find kinetic parameters the solution of equations was compared with 4 set experimental data. Then genetic algorithm find parameters to best fit the experimental data. After that verification of medel was accomplished by rest of experimental data. Finally the effects of some parameters like retention time, initial concentration of substrate, packing size and bed porosity on substrate and intermediate product was surveyed.
    Comparing model prediction with experimental data showed a good fitness for LCFA as consuming substrate, but model prediction was not good enough for VFA. Optimization showed maximum conversion occurred at 38% bed porosity. Modeling also revealed that as packing size decreases the conversion increases which imply the enhancement of specific area by deceasing the radius of packings. Also it could be understood from diagrams that by reaching initial concentration of LCFA to 500 mg/lit the rate of reaction reach to a saturated value, so removal rate remains constant in high concentration
  9. Keywords:
  10. Water Pollution ; Dynamic Modeling ; Biofilm Reactors

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