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This study evaluated the effect of ozonation on the removal of pharmaceuticals in a secondary effluent collected from a sewage treatment plant in Korea. 26 pharmaceuticals were detected in the range of 2.3~144.7 μg/L from a secondary effluent used as a tested water. Clarithromycin etc (macrolide antibiotics), Atenolol etc (antiarrythmics), N,N-diethyl-m-toluamide (repellents), Sulpiride (antipsychotics), Bezafibrate (antilipemics) etc showed a relatively high resistance to ozone compared to other pharmaceuticals at a low ozone feed rate of 0.036 mg/L/min. A high ozone feed rate of 0.36 mg/L/min removed by more than 90% of initial concentration for most of pharmaceuticals, indicating that ozonation is a promising treatment process for residual pharmaceuticals in sewage. The ratio of the number of pharmaceuticals with a removal efficiency of more than 70% to ozone consumption during ozonation showed that the supply of ozone gas by a low concentration could improve the performance of ozonation in removing pharmaceuticals at a same ozone gas flow rate condition.

Removal of Residual Pharmaceuticals in a Secondary Effluent from a Sewage Treatment Plant by Ozonation