Reduction of non-Betalactam Antibiotics COD by Combined Coagulation and Advanced Oxidation Processes

The present study evaluates the reduction of antibiotic COD from wastewater by combined coagulation and advanced oxidation processes (AOPS). The reduction of Azithromycin COD by combined coagulation and Fenton-like processes reached a maximum 96.9% at a reaction time of 30 min, dosage of ferric chloride 120 mg/L, dosages of Fe⁰ and H₂O₂of 0.36mM/L and 0.38 mM/L, respectively. Also, 97.9% of Clarithromycin COD reduction, was achieved at a reaction time of 30 min, dosage of ferric chloride 120 mg/L, dosages of Fe⁰ and H₂O₂ of 0.3 mM/L and 0.3mM/L, respectively. The results of kinetic studies were best fitted to the pseudo first order equation. The results showed a higher rate constant value for combined coagulation and Fenton-like processes [(k ap = 0.022 min−1 and half-life time of 31.5 min for Azithromycin) and (k ap = 0.023 min−1 and half-life time of 30.1 min for Clarithromycin)].