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Removal of Micropollutants from Wastewater Using an Electrochemical Biomembrane Reactor

Abbasi, Pezhman | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55822 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghasemian, Saloumeh; Ghobadinejad, Zahra; Hamzehlouyan, Tayebeh
  7. Abstract:
  8. One of the major environmental problems in recent years is the presence of micropollutants that cause many problems for the environment and living organisms. Diclofenac is one of the micropollutants and endocrine disruptors. Conventional treatment methods do not have the ability to effectively remove pharmaceutical pollutants and micro-pollutants, and finding a suitable approach to remove these pollutants is of great importance. In recent years, biological methods such as the use of enzymes and molds have received attention, but due to the relative removal of pollutants, these methods have been combined with membrane technology to improve the level of pollutant removal and increase the stability of the system. In this research, laccase enzyme was produced from white mold Trametes.sp and the functional conditions and characterization of this enzyme were investigated. Laccase enzyme showed its highest activity at 61°C and pH=4.5 and the highest stability at 41°C and pH=5.5. In addition, a nano-composite membrane was made of polysulfone and laccase enzyme was chemically immobilized on the surface of the membrane to increase the stability of the enzyme. Therefore, the recovery test of immobilized enzyme activity and immobilized laccase activity on enzyme membrane was discussed. According to the obtained results, the recovery of the stabilized enzyme activity was equal to 32.44% and the laccase activity in the enzymatic membrane was 2.06 U cm-2. To determine the characteristics of the membrane, SEM, XRD, FTIR and contact angle analyzes were performed. In this way, the presence of functional groups and surface functionalization were confirmed by the results of XRD and FTIR tests. Also, it was shown that carbon nanoparticles increase membrane surface roughness, porosity and hole size. An electrochemical system was also used to achieve the complete removal of diclofenac drug and TiO2/IrO2/Ta2O5 anode was used to perform the electrochemical removal process. The effect of current density parameters, initial diclofenac pollutant concentration and electrolyte concentration were investigated. According to the obtained results, current density and electrolyte concentration are two very important parameters in the path of pollutant removal. The final system includes the combination of electrochemical and membrane-enzymatic technologies, which in the conditions of current density of 5 mA/cm2, pH=4.5, electrolyte concentration of 10 g/L, pollutant concentration of 20 mg/L, 100٪ removal of diclofenac was observed after 90 minutes
  9. Keywords:
  10. Electrochemistry ; Laccas Enzyme ; Water Treatment ; Nanocomposite Membrane ; Polysulphone ; Water Treatment ; Biological Membrane ; Pollution Removal ; Micropollutants

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