Compared with the treatment of the surface water in north China, the manganese oxidation film, when used to treat the surface water in south China, shows a finer catalytic oxidation behavior, and the effect of removing manganese and ammonium is remarkable. In this research, without any additional condition, only by relying on the performance of the abovesaid film, the rate of the synchronous removal of manganese and ammonium, when the temperature of water is 20°C,can come up to above 95%;and the maximum capacity of the removal of manganese can reach 3.5 mg/L, and the maximum capacity of the removal of ammonium can reach 3 mg/L. In addition, the effect of their removal is stable. It is discovered that, by contrasting the water quality in north China with that in south China, the PH value and the contents of alkalinity, calcium and aluminium in south China all are blew those in north China. When manganese and ammonium are removed by the manganese oxidation film, hydrogen ions are released, resulting in the consumption of the PH value and the alkalinity. Due to this phenomenon, the catalytic oxidation reaction of the abovesaid film is restricted. A careful comparison shows that when the alkalinity of the surface water in north China is 35mg/L, the rate of the removal of manganese and ammonium is 50%. While the alkalinity of the surface water in south China is 30mg/L, the rate of the removal of manganese and ammonium still can come up to 95%. Furthermore, the rate of the removal of manganese can come up to 99% with a proper increase of the alkalinity of influent water. As our experiment has proved, the presence of calcium and aluminium ions in water affects the removal of manganese and ammonium. The abovesaid film is characterized by using scanning electronic microscope, X-ray fluorescence spectrometry and X-ray photoelectronic spectroscopy; and by using XPS and EDS to conduct an analysis of the main elements one the surfaces of the filter media, it is noticed that calcium and aluminium ions are adsorbed on the surface of the abovesaid film and then part in the competition for the active parts on the surface of the abovesaid film, thus playing a role of restricting the catalytic oxidation reaction of the manganese oxidation film.

Simultaneous removal of ammonium and manganese from surface water in South China by manganese co-oxide film: Application effect

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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