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Heterogeneous Catalytic Ozonation by Nano-Mgo Is Better Than Sole Ozonation for Metronidazole Degradation, Toxicity Reduction, and Biodegradability Improvement Publisher



Kermani M1 ; Bahrami Asl F2, 3 ; Farzadkia M1 ; Esrafili A1 ; Salahshour Arian S4 ; Khazaei M5 ; Dadban Shahamat Y6 ; Zeynalzadeh D7
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Environmental Health Engineering, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
  3. 3. Department of Environmental Health Engineering, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
  4. 4. Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran
  5. 5. Department of Civil Engineering, Sharif University of Technology, Tehran, Iran
  6. 6. Environmental Health Research Center, Golestan University of Medical Sciences, Gorgan, Iran
  7. 7. Department of Environmental Health Engineering School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

Source: Desalination and Water Treatment Published:2016


Abstract

Abstract: In the current paper, the removal efficiency of metronidazole (MNZ) using a catalytic ozonation process (COP) in the presence of magnesium oxide nanocrystals, as a catalyst, was investigated in deionized water and compared with a sole ozonation process (SOP). The influence of several operational factors on both removal processes was evaluated: solution pH, MgO dosage, initial MNZ concentration, and reaction time. Biodegradability improvement, mineralization rate, oxidation intermediates, and toxicity were also studied for the COP. The results showed that MgO nanocrystals accelerated MNZ removal compared to the SOP. The optimum pH for both SOP and COP was obtained at 10 and optimum MgO dosage for the COP was determined 0.25 g/L. Under optimum conditions, after 20 min and 35 min, the complete removal of 40 mg/L MNZ solution occurred in COP and SOP, respectively. The COP significantly increased the biological oxygen demand/chemical oxygen demand ratio (from 0.09 to 0.43), caused 93.5% MNZ mineralization, and reduced the toxicity of the MNZ. © 2015 Balaban Desalination Publications. All rights reserved.
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