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Application of Combination of Biological and Chemical based on Oxidation Methods to Treat Emerging Contaminants

Najmi, Mohammad | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57309 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheila; Ghasemian, Saloumeh; Ghobadinejad, Zahra
  7. Abstract:
  8. Industrial wastewater is laden with various hazardous organic and inorganic pollutants, the release of which into the environment without treatment processes poses potential risks. In recent years, water pollution by emerging contaminants such as pharmaceuticals and personal care products has garnered significant attention. This study investigates the removal of four hard-to-degrade pharmaceutical pollutants, namely metronidazole, tetracycline, ciprofloxacin, and carbamazepine, classified as emerging contaminants, using advanced oxidation and biological treatment methods both separately and in combination. Electrochemical oxidation was employed as a reliable method for the pretreatment and removal of these pharmaceutical pollutants. For the experiments related to the electrochemical reactor, a TiO2/IrO2/Ta2O5 anode was used as a cost-effective and practical option for treating these pollutants along with a 316 stainless steel cathode, in various concentrations of acetate buffer solution as a non-supporting electrolyte, and pharmaceutical pollutants at different current densities. The results indicated that under optimal reactor performance based on operational parameters at a pH and buffer concentration of 4.7 and 4 g/L, a current density of 10 mA/cm², and an initial pharmaceutical pollutant concentration of 10 ppm, the degradation rates of metronidazole, tetracycline, ciprofloxacin, and carbamazepine were 100%, 80%, 51%, and 52%, respectively, after 3 hours of processing. Furthermore, in the biological treatment of these pollutants using the white-rot fungus Trametes species in a shaker incubator, with an initial pollutant concentration of 10 ppm, a temperature of 29°C, 120 rpm agitation, and a pH of 4.7, the removal rates of metronidazole, tetracycline, ciprofloxacin, and carbamazepine were 25%, 34%, 60%, and 27%, respectively, after 14 days. In the combined method, using 3 hours of electrochemical reactor pretreatment followed by 14 days of biological treatment, the removal rates of metronidazole, tetracycline, ciprofloxacin, and carbamazepine were 100%, 100%, 87%, and 82%, respectively, in 8 days, and 100%, 100%, 96.8%, and 88%, respectively, in 14 days. This demonstrates a significant degradation and removal rate of these two pollutants in the combined method. Chemical oxygen demand (COD) decreased by 56% after electrochemical treatment and by 93% after the combined method
  9. Keywords:
  10. Emerging Pollutants ; Electrochemical Oxidation ; Biological Treatment ; White-Rot Fungi ; Industrial Wastewaters

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