Abstract
Abstract Anodic oxidation, an environmentally friendly process has been deeply investigated to remove the antibiotic metronidazole (MTZ), dissolved in synthetic wastewaters, via direct and indirect oxidation. Experiments were conducted by boron-doped diamond (BDD) anode in the absence and presence of sodium chloride (NaCl) in the solution. However, no studies have focused on the removal of MTZ using BDD anode or under chlorination process. The chemical oxygen demand (COD) measurement during the processing allowed the evaluation of the kinetics of organic matter decay and the instantaneous current efficiency (ICE). The results have shown that the degradation of MTZ is dependent on its initial concentration, pH, applied current density and NaCl concentration. COD decay follows a pseudo first-order kinetics, and the process was under mass transport control within the range studied, regardless of the experimental conditions. The electrochemical degradation is significantly accelerated by the presence of NaCl in the solution (94% COD removal in just 120 min).
Published Version
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