Simultaneous Removal of CODMn and Ammonium from Water by Potassium Ferrate-Enhanced Iron-Manganese Co-Oxide Film

Iron-manganese co-oxide film (MeOx) has a high removal efficiency for ammonium (NH4+) and manganese (Mn2+) in our previous studies, but it cannot effectively remove CODMn from water. In this study, the catalytic oxidation ability of MeOx was enhanced by dosage with potassium ferrate (K2FeO4) to achieve simultaneous NH4+ water pilot-scale experimental system. By adding 1.0 mg/L K2FeO4 enhance activity MeOx, efficiencies (20.0 mg/L) (1.1 were 92.5 ± 1.5% 60.9 1.4%, respectively, pollutants consistently efficiently removed more than 90 days. The effects filtration rate, temperature pH on also explored, excessive rate (over 11 m/h), lower (below 9.2 °C) 6.20) caused significant decrease CODMn. analyzed at different temperatures, which proved that kinetics pseudo-first order. mature sands column IV taken times microscopic characterization. Scanning electron microscope (SEM) showed some substances formed surface ratio C O elements increased significantly, Mn Fe decreased significantly energy dispersive spectrometer (EDS). However, elemental composition would gradually recover initial state after Mn2+. According X-ray photoelectron spectroscopy (XPS) analysis, substance attached [(-(CH2)4O-)n], fell off Finally, mechanism K2FeO4-enhanced proposed analysis process.