REMOVAL OF SELECTED PHARMACEUTICALS SPIKED IN THE SECONDARY EFFLUENT OF A WASTEWATER TREATMENT PLANT (WWTP) BY POTASSIUM FERRATE(VI)

摘要

This study investigated the ferrate(VI) performance in the removal of 10 target pharmaceuticals spiked in the secondary effluent of a wastewater treatment plant (WWTP). In the raw secondary effluent samples, seven pharmaceuticals of 10 were detected with a maximum concentration of 500.0 ± 28.3 ng/L for ibuprofen (IBU). In the modified effluent samples spiked with 10 target pharmaceuticals, removal efficiencies for most of target compounds were less than 50% at pH 6-9 and 1-5 mg Fe (VI) /L, whereas above 50% of reduction was observed for ciprofloxacin (CIP). Raising the ferrate(VI) dose improved the removal of pharmaceuticals to some extent, while the influence of solution pH on the treatment varied among different target compounds. Ferrate(VI) can efficiently remove pharmaceutical compounds containing electron-rich moieties (ERMs) and then is promising in the removal of pharmaceutical residues in secondary effluents.