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Dynamic Simulation and Control of Anaerobic Photo-Bioreactors Using Purple Phototropic Bacteria in Wastewater Treatment Applications

Nasaji, Amin | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57194 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Vafa، Ehsan
  7. Abstract:
  8. Purple phototropic bacteria (PPB) are a potential mechanism for wastewater treatment and recovering materials. Purple phototropic bacteria is one of the microorganisms that use infrared light energy and carbon contained in volatile fatty acids (VFA), in addition to eliminating nitrogenous compounds, it has a high ability to recover nutrients in wastewater. In this project, a photobioreactor is investigated, in which the purple phototropic bacteria by absorbing nutrients (phosphate and nitrate) and substances present in the wastewater, provides the possibility of releasing these substances in the open environment without the environmental hazards. The mathematical modeling and control of this process have several challenges due to the compound metabolism of these bacteria. During the project, first by examining and studying the results of research and experiments, the kinetics and metabolisms governing the system were extracted and the mathematical models presented in the experimental research were used. The extracted mathematical model for the system is used to develop the control strategy. An anaerobic photobioreactor is simulated as a continuous process for domestic wastewater treatment applications. Finally, a PI controller based on the internal model design method is proposed along with a complementary fuzzy controller to control and increase the performance of the photobioreactor. The PI controller controls the nitrate, phosphate, and organic nutrients outlet concentration by using two manipulating variables, light intensity and solid material time (SRT), and keeping them below the discharge limit. On the other hand, the fuzzy controller acts as a complementary controller next to the PI controller, and when the PI controller loses its performance due to limiting factors, adding nutrients to input feed in a controlled mode, improves the performance of the PI controller and satisfies controller goal. The results show that the proposed control strategy maintains its performance in the conditions of changing the concentration and characteristics of the input feed and changing the discharge standard and always keeps the nutrient concentration lower than the discharge standard
  9. Keywords:
  10. Photo Bioreactor ; Wastewater Treatment Plant ; Dynamic Simulation ; Anaerobic Photobioreactor ; Purple Phototrophic Bacteria ; Complementary Fuzzy Controller ; Control System Design

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